blob: ef8571c8981e0a992d084ec1f4579dc50e363afd [file] [log] [blame]
wdenkc6097192002-11-03 00:24:07 +00001#
Wolfgang Denkb75190d2012-01-19 10:58:21 +01002# (C) Copyright 2000 - 2012
wdenkc6097192002-11-03 00:24:07 +00003# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4#
5# See file CREDITS for list of people who contributed to this
6# project.
7#
8# This program is free software; you can redistribute it and/or
9# modify it under the terms of the GNU General Public License as
10# published by the Free Software Foundation; either version 2 of
11# the License, or (at your option) any later version.
12#
13# This program is distributed in the hope that it will be useful,
14# but WITHOUT ANY WARRANTY; without even the implied warranty of
15# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16# GNU General Public License for more details.
17#
18# You should have received a copy of the GNU General Public License
19# along with this program; if not, write to the Free Software
20# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21# MA 02111-1307 USA
22#
23
24Summary:
25========
26
wdenk24ee89b2002-11-03 17:56:27 +000027This directory contains the source code for U-Boot, a boot loader for
wdenke86e5a02004-10-17 21:12:06 +000028Embedded boards based on PowerPC, ARM, MIPS and several other
29processors, which can be installed in a boot ROM and used to
30initialize and test the hardware or to download and run application
31code.
wdenkc6097192002-11-03 00:24:07 +000032
33The development of U-Boot is closely related to Linux: some parts of
wdenk24ee89b2002-11-03 17:56:27 +000034the source code originate in the Linux source tree, we have some
35header files in common, and special provision has been made to
wdenkc6097192002-11-03 00:24:07 +000036support booting of Linux images.
37
38Some attention has been paid to make this software easily
39configurable and extendable. For instance, all monitor commands are
40implemented with the same call interface, so that it's very easy to
41add new commands. Also, instead of permanently adding rarely used
42code (for instance hardware test utilities) to the monitor, you can
43load and run it dynamically.
44
45
46Status:
47=======
48
49In general, all boards for which a configuration option exists in the
wdenk24ee89b2002-11-03 17:56:27 +000050Makefile have been tested to some extent and can be considered
wdenkc6097192002-11-03 00:24:07 +000051"working". In fact, many of them are used in production systems.
52
wdenk24ee89b2002-11-03 17:56:27 +000053In case of problems see the CHANGELOG and CREDITS files to find out
Wolfgang Denk218ca722008-03-26 10:40:12 +010054who contributed the specific port. The MAINTAINERS file lists board
55maintainers.
wdenkc6097192002-11-03 00:24:07 +000056
Robert P. J. Dayadb9d852012-11-14 02:03:20 +000057Note: There is no CHANGELOG file in the actual U-Boot source tree;
58it can be created dynamically from the Git log using:
59
60 make CHANGELOG
61
wdenkc6097192002-11-03 00:24:07 +000062
63Where to get help:
64==================
65
wdenk24ee89b2002-11-03 17:56:27 +000066In case you have questions about, problems with or contributions for
67U-Boot you should send a message to the U-Boot mailing list at
Peter Tyser0c325652008-09-10 09:18:34 -050068<u-boot@lists.denx.de>. There is also an archive of previous traffic
69on the mailing list - please search the archive before asking FAQ's.
70Please see http://lists.denx.de/pipermail/u-boot and
71http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
wdenkc6097192002-11-03 00:24:07 +000072
73
Wolfgang Denk218ca722008-03-26 10:40:12 +010074Where to get source code:
75=========================
76
77The U-Boot source code is maintained in the git repository at
78git://www.denx.de/git/u-boot.git ; you can browse it online at
79http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
80
81The "snapshot" links on this page allow you to download tarballs of
Marcel Ziswiler11ccc332008-07-09 08:17:15 +020082any version you might be interested in. Official releases are also
Wolfgang Denk218ca722008-03-26 10:40:12 +010083available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
84directory.
85
Anatolij Gustschind4ee7112008-03-26 18:13:33 +010086Pre-built (and tested) images are available from
Wolfgang Denk218ca722008-03-26 10:40:12 +010087ftp://ftp.denx.de/pub/u-boot/images/
88
89
wdenkc6097192002-11-03 00:24:07 +000090Where we come from:
91===================
92
93- start from 8xxrom sources
wdenk24ee89b2002-11-03 17:56:27 +000094- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
wdenkc6097192002-11-03 00:24:07 +000095- clean up code
96- make it easier to add custom boards
97- make it possible to add other [PowerPC] CPUs
98- extend functions, especially:
99 * Provide extended interface to Linux boot loader
100 * S-Record download
101 * network boot
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200102 * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
wdenk24ee89b2002-11-03 17:56:27 +0000103- create ARMBoot project (http://sourceforge.net/projects/armboot)
wdenkc6097192002-11-03 00:24:07 +0000104- add other CPU families (starting with ARM)
wdenk24ee89b2002-11-03 17:56:27 +0000105- create U-Boot project (http://sourceforge.net/projects/u-boot)
Magnus Lilja0d28f342008-08-06 19:32:33 +0200106- current project page: see http://www.denx.de/wiki/U-Boot
wdenk24ee89b2002-11-03 17:56:27 +0000107
108
109Names and Spelling:
110===================
111
112The "official" name of this project is "Das U-Boot". The spelling
113"U-Boot" shall be used in all written text (documentation, comments
114in source files etc.). Example:
115
116 This is the README file for the U-Boot project.
117
118File names etc. shall be based on the string "u-boot". Examples:
119
120 include/asm-ppc/u-boot.h
121
122 #include <asm/u-boot.h>
123
124Variable names, preprocessor constants etc. shall be either based on
125the string "u_boot" or on "U_BOOT". Example:
126
127 U_BOOT_VERSION u_boot_logo
128 IH_OS_U_BOOT u_boot_hush_start
wdenkc6097192002-11-03 00:24:07 +0000129
130
wdenk93f19cc2002-12-17 17:55:09 +0000131Versioning:
132===========
133
Thomas Weber360d8832010-09-28 08:06:25 +0200134Starting with the release in October 2008, the names of the releases
135were changed from numerical release numbers without deeper meaning
136into a time stamp based numbering. Regular releases are identified by
137names consisting of the calendar year and month of the release date.
138Additional fields (if present) indicate release candidates or bug fix
139releases in "stable" maintenance trees.
wdenk93f19cc2002-12-17 17:55:09 +0000140
Thomas Weber360d8832010-09-28 08:06:25 +0200141Examples:
Wolfgang Denkc0f40852011-10-26 10:21:21 +0000142 U-Boot v2009.11 - Release November 2009
Thomas Weber360d8832010-09-28 08:06:25 +0200143 U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
144 U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
wdenk93f19cc2002-12-17 17:55:09 +0000145
146
wdenkc6097192002-11-03 00:24:07 +0000147Directory Hierarchy:
148====================
149
Peter Tyser8d321b82010-04-12 22:28:21 -0500150/arch Architecture specific files
151 /arm Files generic to ARM architecture
152 /cpu CPU specific files
153 /arm720t Files specific to ARM 720 CPUs
154 /arm920t Files specific to ARM 920 CPUs
Andreas Bießmann6eb09212011-07-18 09:41:08 +0000155 /at91 Files specific to Atmel AT91RM9200 CPU
Wolfgang Denka9046b92010-06-13 17:48:15 +0200156 /imx Files specific to Freescale MC9328 i.MX CPUs
157 /s3c24x0 Files specific to Samsung S3C24X0 CPUs
Peter Tyser8d321b82010-04-12 22:28:21 -0500158 /arm925t Files specific to ARM 925 CPUs
159 /arm926ejs Files specific to ARM 926 CPUs
160 /arm1136 Files specific to ARM 1136 CPUs
161 /ixp Files specific to Intel XScale IXP CPUs
162 /pxa Files specific to Intel XScale PXA CPUs
163 /s3c44b0 Files specific to Samsung S3C44B0 CPUs
164 /sa1100 Files specific to Intel StrongARM SA1100 CPUs
165 /lib Architecture specific library files
166 /avr32 Files generic to AVR32 architecture
167 /cpu CPU specific files
168 /lib Architecture specific library files
169 /blackfin Files generic to Analog Devices Blackfin architecture
170 /cpu CPU specific files
171 /lib Architecture specific library files
Graeme Russfea25722011-04-13 19:43:28 +1000172 /x86 Files generic to x86 architecture
Peter Tyser8d321b82010-04-12 22:28:21 -0500173 /cpu CPU specific files
174 /lib Architecture specific library files
175 /m68k Files generic to m68k architecture
176 /cpu CPU specific files
177 /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
178 /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
179 /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
180 /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
181 /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
182 /lib Architecture specific library files
183 /microblaze Files generic to microblaze architecture
184 /cpu CPU specific files
185 /lib Architecture specific library files
186 /mips Files generic to MIPS architecture
187 /cpu CPU specific files
Daniel Schwierzeck92bbd642011-07-27 13:22:39 +0200188 /mips32 Files specific to MIPS32 CPUs
Xiangfu Liu80421fc2011-10-12 12:24:06 +0800189 /xburst Files specific to Ingenic XBurst CPUs
Peter Tyser8d321b82010-04-12 22:28:21 -0500190 /lib Architecture specific library files
Macpaul Linafc1ce82011-10-19 20:41:11 +0000191 /nds32 Files generic to NDS32 architecture
192 /cpu CPU specific files
193 /n1213 Files specific to Andes Technology N1213 CPUs
194 /lib Architecture specific library files
Peter Tyser8d321b82010-04-12 22:28:21 -0500195 /nios2 Files generic to Altera NIOS2 architecture
196 /cpu CPU specific files
197 /lib Architecture specific library files
Stefan Roesea47a12b2010-04-15 16:07:28 +0200198 /powerpc Files generic to PowerPC architecture
Peter Tyser8d321b82010-04-12 22:28:21 -0500199 /cpu CPU specific files
200 /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
201 /mpc5xx Files specific to Freescale MPC5xx CPUs
202 /mpc5xxx Files specific to Freescale MPC5xxx CPUs
203 /mpc8xx Files specific to Freescale MPC8xx CPUs
204 /mpc8220 Files specific to Freescale MPC8220 CPUs
205 /mpc824x Files specific to Freescale MPC824x CPUs
206 /mpc8260 Files specific to Freescale MPC8260 CPUs
207 /mpc85xx Files specific to Freescale MPC85xx CPUs
208 /ppc4xx Files specific to AMCC PowerPC 4xx CPUs
209 /lib Architecture specific library files
210 /sh Files generic to SH architecture
211 /cpu CPU specific files
212 /sh2 Files specific to sh2 CPUs
213 /sh3 Files specific to sh3 CPUs
214 /sh4 Files specific to sh4 CPUs
215 /lib Architecture specific library files
216 /sparc Files generic to SPARC architecture
217 /cpu CPU specific files
218 /leon2 Files specific to Gaisler LEON2 SPARC CPU
219 /leon3 Files specific to Gaisler LEON3 SPARC CPU
220 /lib Architecture specific library files
221/api Machine/arch independent API for external apps
222/board Board dependent files
223/common Misc architecture independent functions
224/disk Code for disk drive partition handling
225/doc Documentation (don't expect too much)
226/drivers Commonly used device drivers
227/examples Example code for standalone applications, etc.
228/fs Filesystem code (cramfs, ext2, jffs2, etc.)
229/include Header Files
230/lib Files generic to all architectures
231 /libfdt Library files to support flattened device trees
232 /lzma Library files to support LZMA decompression
233 /lzo Library files to support LZO decompression
234/net Networking code
235/post Power On Self Test
236/rtc Real Time Clock drivers
237/tools Tools to build S-Record or U-Boot images, etc.
wdenkc6097192002-11-03 00:24:07 +0000238
wdenkc6097192002-11-03 00:24:07 +0000239Software Configuration:
240=======================
241
242Configuration is usually done using C preprocessor defines; the
243rationale behind that is to avoid dead code whenever possible.
244
245There are two classes of configuration variables:
246
247* Configuration _OPTIONS_:
248 These are selectable by the user and have names beginning with
249 "CONFIG_".
250
251* Configuration _SETTINGS_:
252 These depend on the hardware etc. and should not be meddled with if
253 you don't know what you're doing; they have names beginning with
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200254 "CONFIG_SYS_".
wdenkc6097192002-11-03 00:24:07 +0000255
256Later we will add a configuration tool - probably similar to or even
257identical to what's used for the Linux kernel. Right now, we have to
258do the configuration by hand, which means creating some symbolic
259links and editing some configuration files. We use the TQM8xxL boards
260as an example here.
261
262
263Selection of Processor Architecture and Board Type:
264---------------------------------------------------
265
266For all supported boards there are ready-to-use default
267configurations available; just type "make <board_name>_config".
268
269Example: For a TQM823L module type:
270
271 cd u-boot
272 make TQM823L_config
273
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200274For the Cogent platform, you need to specify the CPU type as well;
wdenkc6097192002-11-03 00:24:07 +0000275e.g. "make cogent_mpc8xx_config". And also configure the cogent
276directory according to the instructions in cogent/README.
277
278
279Configuration Options:
280----------------------
281
282Configuration depends on the combination of board and CPU type; all
283such information is kept in a configuration file
284"include/configs/<board_name>.h".
285
286Example: For a TQM823L module, all configuration settings are in
287"include/configs/TQM823L.h".
288
289
wdenk7f6c2cb2002-11-10 22:06:23 +0000290Many of the options are named exactly as the corresponding Linux
291kernel configuration options. The intention is to make it easier to
292build a config tool - later.
293
294
wdenkc6097192002-11-03 00:24:07 +0000295The following options need to be configured:
296
Kim Phillips26281142007-08-10 13:28:25 -0500297- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
wdenkc6097192002-11-03 00:24:07 +0000298
Kim Phillips26281142007-08-10 13:28:25 -0500299- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
Wolfgang Denk6ccec442006-10-24 14:42:37 +0200300
301- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
Haavard Skinnemoen09ea0de2007-11-01 12:44:20 +0100302 Define exactly one, e.g. CONFIG_ATSTK1002
wdenkc6097192002-11-03 00:24:07 +0000303
304- CPU Module Type: (if CONFIG_COGENT is defined)
305 Define exactly one of
306 CONFIG_CMA286_60_OLD
307--- FIXME --- not tested yet:
308 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
309 CONFIG_CMA287_23, CONFIG_CMA287_50
310
311- Motherboard Type: (if CONFIG_COGENT is defined)
312 Define exactly one of
313 CONFIG_CMA101, CONFIG_CMA102
314
315- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
316 Define one or more of
317 CONFIG_CMA302
318
319- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
320 Define one or more of
321 CONFIG_LCD_HEARTBEAT - update a character position on
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200322 the LCD display every second with
wdenkc6097192002-11-03 00:24:07 +0000323 a "rotator" |\-/|\-/
324
wdenk2535d602003-07-17 23:16:40 +0000325- Board flavour: (if CONFIG_MPC8260ADS is defined)
326 CONFIG_ADSTYPE
327 Possible values are:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200328 CONFIG_SYS_8260ADS - original MPC8260ADS
329 CONFIG_SYS_8266ADS - MPC8266ADS
330 CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
331 CONFIG_SYS_8272ADS - MPC8272ADS
wdenk2535d602003-07-17 23:16:40 +0000332
Lei Wencf946c62011-02-09 18:06:58 +0530333- Marvell Family Member
334 CONFIG_SYS_MVFS - define it if you want to enable
335 multiple fs option at one time
336 for marvell soc family
337
wdenkc6097192002-11-03 00:24:07 +0000338- MPC824X Family Member (if CONFIG_MPC824X is defined)
wdenk5da627a2003-10-09 20:09:04 +0000339 Define exactly one of
340 CONFIG_MPC8240, CONFIG_MPC8245
wdenkc6097192002-11-03 00:24:07 +0000341
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200342- 8xx CPU Options: (if using an MPC8xx CPU)
wdenk66ca92a2004-09-28 17:59:53 +0000343 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
344 get_gclk_freq() cannot work
wdenk5da627a2003-10-09 20:09:04 +0000345 e.g. if there is no 32KHz
346 reference PIT/RTC clock
wdenk66ca92a2004-09-28 17:59:53 +0000347 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
348 or XTAL/EXTAL)
wdenkc6097192002-11-03 00:24:07 +0000349
wdenk66ca92a2004-09-28 17:59:53 +0000350- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200351 CONFIG_SYS_8xx_CPUCLK_MIN
352 CONFIG_SYS_8xx_CPUCLK_MAX
wdenk66ca92a2004-09-28 17:59:53 +0000353 CONFIG_8xx_CPUCLK_DEFAULT
wdenk75d1ea72004-01-31 20:06:54 +0000354 See doc/README.MPC866
355
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200356 CONFIG_SYS_MEASURE_CPUCLK
wdenk75d1ea72004-01-31 20:06:54 +0000357
wdenkba56f622004-02-06 23:19:44 +0000358 Define this to measure the actual CPU clock instead
359 of relying on the correctness of the configured
360 values. Mostly useful for board bringup to make sure
361 the PLL is locked at the intended frequency. Note
362 that this requires a (stable) reference clock (32 kHz
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200363 RTC clock or CONFIG_SYS_8XX_XIN)
wdenk75d1ea72004-01-31 20:06:54 +0000364
Heiko Schocher506f3912009-03-12 07:37:15 +0100365 CONFIG_SYS_DELAYED_ICACHE
366
367 Define this option if you want to enable the
368 ICache only when Code runs from RAM.
369
Kumar Gala66412c62011-02-18 05:40:54 -0600370- 85xx CPU Options:
York Sunffd06e02012-10-08 07:44:30 +0000371 CONFIG_SYS_PPC64
372
373 Specifies that the core is a 64-bit PowerPC implementation (implements
374 the "64" category of the Power ISA). This is necessary for ePAPR
375 compliance, among other possible reasons.
376
Kumar Gala66412c62011-02-18 05:40:54 -0600377 CONFIG_SYS_FSL_TBCLK_DIV
378
379 Defines the core time base clock divider ratio compared to the
380 system clock. On most PQ3 devices this is 8, on newer QorIQ
381 devices it can be 16 or 32. The ratio varies from SoC to Soc.
382
Kumar Gala8f290842011-05-20 00:39:21 -0500383 CONFIG_SYS_FSL_PCIE_COMPAT
384
385 Defines the string to utilize when trying to match PCIe device
386 tree nodes for the given platform.
387
Prabhakar Kushwahaafa6b552012-04-29 23:56:13 +0000388 CONFIG_SYS_PPC_E500_DEBUG_TLB
389
390 Enables a temporary TLB entry to be used during boot to work
391 around limitations in e500v1 and e500v2 external debugger
392 support. This reduces the portions of the boot code where
393 breakpoints and single stepping do not work. The value of this
394 symbol should be set to the TLB1 entry to be used for this
395 purpose.
396
Scott Wood33eee332012-08-14 10:14:53 +0000397 CONFIG_SYS_FSL_ERRATUM_A004510
398
399 Enables a workaround for erratum A004510. If set,
400 then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
401 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
402
403 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
404 CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
405
406 Defines one or two SoC revisions (low 8 bits of SVR)
407 for which the A004510 workaround should be applied.
408
409 The rest of SVR is either not relevant to the decision
410 of whether the erratum is present (e.g. p2040 versus
411 p2041) or is implied by the build target, which controls
412 whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
413
414 See Freescale App Note 4493 for more information about
415 this erratum.
416
417 CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
418
419 This is the value to write into CCSR offset 0x18600
420 according to the A004510 workaround.
421
Daniel Schwierzeck6cb461b2012-04-02 02:57:56 +0000422- Generic CPU options:
423 CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
424
425 Defines the endianess of the CPU. Implementation of those
426 values is arch specific.
427
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100428- Intel Monahans options:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200429 CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100430
431 Defines the Monahans run mode to oscillator
432 ratio. Valid values are 8, 16, 24, 31. The core
433 frequency is this value multiplied by 13 MHz.
434
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200435 CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200436
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100437 Defines the Monahans turbo mode to oscillator
438 ratio. Valid values are 1 (default if undefined) and
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200439 2. The core frequency as calculated above is multiplied
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100440 by this value.
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200441
Daniel Schwierzeck92bbd642011-07-27 13:22:39 +0200442- MIPS CPU options:
443 CONFIG_SYS_INIT_SP_OFFSET
444
445 Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
446 pointer. This is needed for the temporary stack before
447 relocation.
448
449 CONFIG_SYS_MIPS_CACHE_MODE
450
451 Cache operation mode for the MIPS CPU.
452 See also arch/mips/include/asm/mipsregs.h.
453 Possible values are:
454 CONF_CM_CACHABLE_NO_WA
455 CONF_CM_CACHABLE_WA
456 CONF_CM_UNCACHED
457 CONF_CM_CACHABLE_NONCOHERENT
458 CONF_CM_CACHABLE_CE
459 CONF_CM_CACHABLE_COW
460 CONF_CM_CACHABLE_CUW
461 CONF_CM_CACHABLE_ACCELERATED
462
463 CONFIG_SYS_XWAY_EBU_BOOTCFG
464
465 Special option for Lantiq XWAY SoCs for booting from NOR flash.
466 See also arch/mips/cpu/mips32/start.S.
467
468 CONFIG_XWAY_SWAP_BYTES
469
470 Enable compilation of tools/xway-swap-bytes needed for Lantiq
471 XWAY SoCs for booting from NOR flash. The U-Boot image needs to
472 be swapped if a flash programmer is used.
473
Christian Rieschb67d8812012-02-02 00:44:39 +0000474- ARM options:
475 CONFIG_SYS_EXCEPTION_VECTORS_HIGH
476
477 Select high exception vectors of the ARM core, e.g., do not
478 clear the V bit of the c1 register of CP15.
479
Aneesh V5356f542012-03-08 07:20:19 +0000480 CONFIG_SYS_THUMB_BUILD
481
482 Use this flag to build U-Boot using the Thumb instruction
483 set for ARM architectures. Thumb instruction set provides
484 better code density. For ARM architectures that support
485 Thumb2 this flag will result in Thumb2 code generated by
486 GCC.
487
wdenk5da627a2003-10-09 20:09:04 +0000488- Linux Kernel Interface:
wdenkc6097192002-11-03 00:24:07 +0000489 CONFIG_CLOCKS_IN_MHZ
490
491 U-Boot stores all clock information in Hz
492 internally. For binary compatibility with older Linux
493 kernels (which expect the clocks passed in the
494 bd_info data to be in MHz) the environment variable
495 "clocks_in_mhz" can be defined so that U-Boot
496 converts clock data to MHZ before passing it to the
497 Linux kernel.
wdenkc6097192002-11-03 00:24:07 +0000498 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
Wolfgang Denk218ca722008-03-26 10:40:12 +0100499 "clocks_in_mhz=1" is automatically included in the
wdenkc6097192002-11-03 00:24:07 +0000500 default environment.
501
wdenk5da627a2003-10-09 20:09:04 +0000502 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
503
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200504 When transferring memsize parameter to linux, some versions
wdenk5da627a2003-10-09 20:09:04 +0000505 expect it to be in bytes, others in MB.
506 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
507
Gerald Van Barenfec6d9e2008-06-03 20:34:45 -0400508 CONFIG_OF_LIBFDT
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200509
510 New kernel versions are expecting firmware settings to be
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400511 passed using flattened device trees (based on open firmware
512 concepts).
513
514 CONFIG_OF_LIBFDT
515 * New libfdt-based support
516 * Adds the "fdt" command
Kim Phillips3bb342f2007-08-10 14:34:14 -0500517 * The bootm command automatically updates the fdt
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400518
Marcel Ziswilerb55ae402009-09-09 21:18:41 +0200519 OF_CPU - The proper name of the cpus node (only required for
520 MPC512X and MPC5xxx based boards).
521 OF_SOC - The proper name of the soc node (only required for
522 MPC512X and MPC5xxx based boards).
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200523 OF_TBCLK - The timebase frequency.
Kumar Galac2871f02006-01-11 13:59:02 -0600524 OF_STDOUT_PATH - The path to the console device
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200525
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200526 boards with QUICC Engines require OF_QE to set UCC MAC
527 addresses
Kim Phillips3bb342f2007-08-10 14:34:14 -0500528
Kumar Gala4e253132006-01-11 13:54:17 -0600529 CONFIG_OF_BOARD_SETUP
530
531 Board code has addition modification that it wants to make
532 to the flat device tree before handing it off to the kernel
wdenk6705d812004-08-02 23:22:59 +0000533
Matthew McClintock02677682006-06-28 10:41:37 -0500534 CONFIG_OF_BOOT_CPU
535
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200536 This define fills in the correct boot CPU in the boot
Matthew McClintock02677682006-06-28 10:41:37 -0500537 param header, the default value is zero if undefined.
538
Heiko Schocher3887c3f2009-09-23 07:56:08 +0200539 CONFIG_OF_IDE_FIXUP
540
541 U-Boot can detect if an IDE device is present or not.
542 If not, and this new config option is activated, U-Boot
543 removes the ATA node from the DTS before booting Linux,
544 so the Linux IDE driver does not probe the device and
545 crash. This is needed for buggy hardware (uc101) where
546 no pull down resistor is connected to the signal IDE5V_DD7.
547
Igor Grinberg7eb29392011-07-14 05:45:07 +0000548 CONFIG_MACH_TYPE [relevant for ARM only][mandatory]
549
550 This setting is mandatory for all boards that have only one
551 machine type and must be used to specify the machine type
552 number as it appears in the ARM machine registry
553 (see http://www.arm.linux.org.uk/developer/machines/).
554 Only boards that have multiple machine types supported
555 in a single configuration file and the machine type is
556 runtime discoverable, do not have to use this setting.
557
Niklaus Giger0b2f4ec2008-11-03 22:13:47 +0100558- vxWorks boot parameters:
559
560 bootvx constructs a valid bootline using the following
561 environments variables: bootfile, ipaddr, serverip, hostname.
562 It loads the vxWorks image pointed bootfile.
563
564 CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
565 CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
566 CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
567 CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
568
569 CONFIG_SYS_VXWORKS_ADD_PARAMS
570
571 Add it at the end of the bootline. E.g "u=username pw=secret"
572
573 Note: If a "bootargs" environment is defined, it will overwride
574 the defaults discussed just above.
575
Aneesh V2c451f72011-06-16 23:30:47 +0000576- Cache Configuration:
577 CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
578 CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
579 CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
580
Aneesh V93bc2192011-06-16 23:30:51 +0000581- Cache Configuration for ARM:
582 CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
583 controller
584 CONFIG_SYS_PL310_BASE - Physical base address of PL310
585 controller register space
586
wdenk6705d812004-08-02 23:22:59 +0000587- Serial Ports:
Andreas Engel48d01922008-09-08 14:30:53 +0200588 CONFIG_PL010_SERIAL
wdenk6705d812004-08-02 23:22:59 +0000589
590 Define this if you want support for Amba PrimeCell PL010 UARTs.
591
Andreas Engel48d01922008-09-08 14:30:53 +0200592 CONFIG_PL011_SERIAL
wdenk6705d812004-08-02 23:22:59 +0000593
594 Define this if you want support for Amba PrimeCell PL011 UARTs.
595
596 CONFIG_PL011_CLOCK
597
598 If you have Amba PrimeCell PL011 UARTs, set this variable to
599 the clock speed of the UARTs.
600
601 CONFIG_PL01x_PORTS
602
603 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
604 define this to a list of base addresses for each (supported)
605 port. See e.g. include/configs/versatile.h
606
John Rigby910f1ae2011-04-19 10:42:39 +0000607 CONFIG_PL011_SERIAL_RLCR
608
609 Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
610 have separate receive and transmit line control registers. Set
611 this variable to initialize the extra register.
612
613 CONFIG_PL011_SERIAL_FLUSH_ON_INIT
614
615 On some platforms (e.g. U8500) U-Boot is loaded by a second stage
616 boot loader that has already initialized the UART. Define this
617 variable to flush the UART at init time.
618
wdenk6705d812004-08-02 23:22:59 +0000619
wdenkc6097192002-11-03 00:24:07 +0000620- Console Interface:
wdenk43d96162003-03-06 00:02:04 +0000621 Depending on board, define exactly one serial port
622 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
623 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
624 console by defining CONFIG_8xx_CONS_NONE
wdenkc6097192002-11-03 00:24:07 +0000625
626 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
627 port routines must be defined elsewhere
628 (i.e. serial_init(), serial_getc(), ...)
629
630 CONFIG_CFB_CONSOLE
631 Enables console device for a color framebuffer. Needs following
Wolfgang Denkc53043b2011-12-07 12:19:20 +0000632 defines (cf. smiLynxEM, i8042)
wdenkc6097192002-11-03 00:24:07 +0000633 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
634 (default big endian)
635 VIDEO_HW_RECTFILL graphic chip supports
636 rectangle fill
637 (cf. smiLynxEM)
638 VIDEO_HW_BITBLT graphic chip supports
639 bit-blit (cf. smiLynxEM)
640 VIDEO_VISIBLE_COLS visible pixel columns
641 (cols=pitch)
wdenkba56f622004-02-06 23:19:44 +0000642 VIDEO_VISIBLE_ROWS visible pixel rows
643 VIDEO_PIXEL_SIZE bytes per pixel
wdenkc6097192002-11-03 00:24:07 +0000644 VIDEO_DATA_FORMAT graphic data format
645 (0-5, cf. cfb_console.c)
wdenkba56f622004-02-06 23:19:44 +0000646 VIDEO_FB_ADRS framebuffer address
wdenkc6097192002-11-03 00:24:07 +0000647 VIDEO_KBD_INIT_FCT keyboard int fct
648 (i.e. i8042_kbd_init())
649 VIDEO_TSTC_FCT test char fct
650 (i.e. i8042_tstc)
651 VIDEO_GETC_FCT get char fct
652 (i.e. i8042_getc)
653 CONFIG_CONSOLE_CURSOR cursor drawing on/off
654 (requires blink timer
655 cf. i8042.c)
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200656 CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
wdenkc6097192002-11-03 00:24:07 +0000657 CONFIG_CONSOLE_TIME display time/date info in
658 upper right corner
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500659 (requires CONFIG_CMD_DATE)
wdenkc6097192002-11-03 00:24:07 +0000660 CONFIG_VIDEO_LOGO display Linux logo in
661 upper left corner
wdenka6c7ad22002-12-03 21:28:10 +0000662 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
663 linux_logo.h for logo.
664 Requires CONFIG_VIDEO_LOGO
wdenkc6097192002-11-03 00:24:07 +0000665 CONFIG_CONSOLE_EXTRA_INFO
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200666 additional board info beside
wdenkc6097192002-11-03 00:24:07 +0000667 the logo
668
Pali Rohár33a35bb2012-10-19 13:30:09 +0000669 When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
670 a limited number of ANSI escape sequences (cursor control,
671 erase functions and limited graphics rendition control).
672
wdenk43d96162003-03-06 00:02:04 +0000673 When CONFIG_CFB_CONSOLE is defined, video console is
674 default i/o. Serial console can be forced with
675 environment 'console=serial'.
wdenkc6097192002-11-03 00:24:07 +0000676
wdenkd4ca31c2004-01-02 14:00:00 +0000677 When CONFIG_SILENT_CONSOLE is defined, all console
678 messages (by U-Boot and Linux!) can be silenced with
679 the "silent" environment variable. See
680 doc/README.silent for more information.
wdenka3ad8e22003-10-19 23:22:11 +0000681
wdenkc6097192002-11-03 00:24:07 +0000682- Console Baudrate:
683 CONFIG_BAUDRATE - in bps
684 Select one of the baudrates listed in
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200685 CONFIG_SYS_BAUDRATE_TABLE, see below.
686 CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
wdenkc6097192002-11-03 00:24:07 +0000687
Heiko Schocherc92fac92009-01-30 12:55:38 +0100688- Console Rx buffer length
689 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
690 the maximum receive buffer length for the SMC.
Heiko Schocher2b3f12c2009-02-10 09:31:47 +0100691 This option is actual only for 82xx and 8xx possible.
Heiko Schocherc92fac92009-01-30 12:55:38 +0100692 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
693 must be defined, to setup the maximum idle timeout for
694 the SMC.
695
Graeme Russ9558b482011-09-01 00:48:27 +0000696- Pre-Console Buffer:
Wolfgang Denk4cf26092011-10-07 09:58:21 +0200697 Prior to the console being initialised (i.e. serial UART
698 initialised etc) all console output is silently discarded.
699 Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
700 buffer any console messages prior to the console being
701 initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
702 bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
703 a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
Wolfgang Denk6feff892011-10-09 21:06:34 +0200704 bytes are output before the console is initialised, the
Wolfgang Denk4cf26092011-10-07 09:58:21 +0200705 earlier bytes are discarded.
Graeme Russ9558b482011-09-01 00:48:27 +0000706
Wolfgang Denk4cf26092011-10-07 09:58:21 +0200707 'Sane' compilers will generate smaller code if
708 CONFIG_PRE_CON_BUF_SZ is a power of 2
Graeme Russ9558b482011-09-01 00:48:27 +0000709
Sonny Rao046a37b2011-11-02 09:52:08 +0000710- Safe printf() functions
711 Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
712 the printf() functions. These are defined in
713 include/vsprintf.h and include snprintf(), vsnprintf() and
714 so on. Code size increase is approximately 300-500 bytes.
715 If this option is not given then these functions will
716 silently discard their buffer size argument - this means
717 you are not getting any overflow checking in this case.
718
wdenkc6097192002-11-03 00:24:07 +0000719- Boot Delay: CONFIG_BOOTDELAY - in seconds
720 Delay before automatically booting the default image;
721 set to -1 to disable autoboot.
Joe Hershberger93d72122012-08-17 10:53:12 +0000722 set to -2 to autoboot with no delay and not check for abort
723 (even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
wdenkc6097192002-11-03 00:24:07 +0000724
725 See doc/README.autoboot for these options that
726 work with CONFIG_BOOTDELAY. None are required.
727 CONFIG_BOOT_RETRY_TIME
728 CONFIG_BOOT_RETRY_MIN
729 CONFIG_AUTOBOOT_KEYED
730 CONFIG_AUTOBOOT_PROMPT
731 CONFIG_AUTOBOOT_DELAY_STR
732 CONFIG_AUTOBOOT_STOP_STR
733 CONFIG_AUTOBOOT_DELAY_STR2
734 CONFIG_AUTOBOOT_STOP_STR2
735 CONFIG_ZERO_BOOTDELAY_CHECK
736 CONFIG_RESET_TO_RETRY
737
738- Autoboot Command:
739 CONFIG_BOOTCOMMAND
740 Only needed when CONFIG_BOOTDELAY is enabled;
741 define a command string that is automatically executed
742 when no character is read on the console interface
743 within "Boot Delay" after reset.
744
745 CONFIG_BOOTARGS
wdenk43d96162003-03-06 00:02:04 +0000746 This can be used to pass arguments to the bootm
747 command. The value of CONFIG_BOOTARGS goes into the
748 environment value "bootargs".
wdenkc6097192002-11-03 00:24:07 +0000749
750 CONFIG_RAMBOOT and CONFIG_NFSBOOT
wdenk43d96162003-03-06 00:02:04 +0000751 The value of these goes into the environment as
752 "ramboot" and "nfsboot" respectively, and can be used
753 as a convenience, when switching between booting from
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200754 RAM and NFS.
wdenkc6097192002-11-03 00:24:07 +0000755
756- Pre-Boot Commands:
757 CONFIG_PREBOOT
758
759 When this option is #defined, the existence of the
760 environment variable "preboot" will be checked
761 immediately before starting the CONFIG_BOOTDELAY
762 countdown and/or running the auto-boot command resp.
763 entering interactive mode.
764
765 This feature is especially useful when "preboot" is
766 automatically generated or modified. For an example
767 see the LWMON board specific code: here "preboot" is
768 modified when the user holds down a certain
769 combination of keys on the (special) keyboard when
770 booting the systems
771
772- Serial Download Echo Mode:
773 CONFIG_LOADS_ECHO
774 If defined to 1, all characters received during a
775 serial download (using the "loads" command) are
776 echoed back. This might be needed by some terminal
777 emulations (like "cu"), but may as well just take
778 time on others. This setting #define's the initial
779 value of the "loads_echo" environment variable.
780
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500781- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
wdenkc6097192002-11-03 00:24:07 +0000782 CONFIG_KGDB_BAUDRATE
783 Select one of the baudrates listed in
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200784 CONFIG_SYS_BAUDRATE_TABLE, see below.
wdenkc6097192002-11-03 00:24:07 +0000785
786- Monitor Functions:
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500787 Monitor commands can be included or excluded
788 from the build by using the #include files
Stephen Warrenc6c621b2012-08-05 16:07:19 +0000789 <config_cmd_all.h> and #undef'ing unwanted
790 commands, or using <config_cmd_default.h>
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500791 and augmenting with additional #define's
792 for wanted commands.
wdenkc6097192002-11-03 00:24:07 +0000793
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500794 The default command configuration includes all commands
795 except those marked below with a "*".
wdenkc6097192002-11-03 00:24:07 +0000796
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500797 CONFIG_CMD_ASKENV * ask for env variable
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500798 CONFIG_CMD_BDI bdinfo
799 CONFIG_CMD_BEDBUG * Include BedBug Debugger
800 CONFIG_CMD_BMP * BMP support
801 CONFIG_CMD_BSP * Board specific commands
802 CONFIG_CMD_BOOTD bootd
803 CONFIG_CMD_CACHE * icache, dcache
804 CONFIG_CMD_CONSOLE coninfo
Mike Frysinger710b9932010-12-21 14:19:51 -0500805 CONFIG_CMD_CRC32 * crc32
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500806 CONFIG_CMD_DATE * support for RTC, date/time...
807 CONFIG_CMD_DHCP * DHCP support
808 CONFIG_CMD_DIAG * Diagnostics
Peter Tysera7c93102008-12-17 16:36:22 -0600809 CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
810 CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
811 CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
812 CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500813 CONFIG_CMD_DTT * Digital Therm and Thermostat
814 CONFIG_CMD_ECHO echo arguments
Peter Tyser246c6922009-10-25 15:12:56 -0500815 CONFIG_CMD_EDITENV edit env variable
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500816 CONFIG_CMD_EEPROM * EEPROM read/write support
817 CONFIG_CMD_ELF * bootelf, bootvx
Joe Hershberger5e2b3e02012-12-11 22:16:25 -0600818 CONFIG_CMD_ENV_CALLBACK * display details about env callbacks
Joe Hershbergerfffad712012-12-11 22:16:33 -0600819 CONFIG_CMD_ENV_FLAGS * display details about env flags
Mike Frysinger0c79cda2010-12-26 23:09:45 -0500820 CONFIG_CMD_EXPORTENV * export the environment
Stephen Warren03e2ecf2012-10-22 06:43:50 +0000821 CONFIG_CMD_EXT2 * ext2 command support
822 CONFIG_CMD_EXT4 * ext4 command support
Mike Frysingerbdab39d2009-01-28 19:08:14 -0500823 CONFIG_CMD_SAVEENV saveenv
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500824 CONFIG_CMD_FDC * Floppy Disk Support
Stephen Warren03e2ecf2012-10-22 06:43:50 +0000825 CONFIG_CMD_FAT * FAT command support
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500826 CONFIG_CMD_FDOS * Dos diskette Support
827 CONFIG_CMD_FLASH flinfo, erase, protect
828 CONFIG_CMD_FPGA FPGA device initialization support
Anton Staaf53fdc7e2012-12-05 14:46:29 +0000829 CONFIG_CMD_GETTIME * Get time since boot
Mike Frysingera641b972010-12-26 23:32:22 -0500830 CONFIG_CMD_GO * the 'go' command (exec code)
Kim Phillipsa000b792011-04-05 07:15:14 +0000831 CONFIG_CMD_GREPENV * search environment
Simon Glassbf36c5d2012-12-05 14:46:38 +0000832 CONFIG_CMD_HASH * calculate hash / digest
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500833 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
834 CONFIG_CMD_I2C * I2C serial bus support
835 CONFIG_CMD_IDE * IDE harddisk support
836 CONFIG_CMD_IMI iminfo
837 CONFIG_CMD_IMLS List all found images
838 CONFIG_CMD_IMMAP * IMMR dump support
Mike Frysinger0c79cda2010-12-26 23:09:45 -0500839 CONFIG_CMD_IMPORTENV * import an environment
Joe Hershbergerc167cc02012-10-03 11:15:51 +0000840 CONFIG_CMD_INI * import data from an ini file into the env
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500841 CONFIG_CMD_IRQ * irqinfo
842 CONFIG_CMD_ITEST Integer/string test of 2 values
843 CONFIG_CMD_JFFS2 * JFFS2 Support
844 CONFIG_CMD_KGDB * kgdb
Mike Frysinger1ba7fd22010-12-26 12:34:49 -0500845 CONFIG_CMD_LDRINFO ldrinfo (display Blackfin loader)
Joe Hershbergerd22c3382012-05-23 08:00:12 +0000846 CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration
847 (169.254.*.*)
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500848 CONFIG_CMD_LOADB loadb
849 CONFIG_CMD_LOADS loads
Robin Getz02c9aa12009-07-27 00:07:59 -0400850 CONFIG_CMD_MD5SUM print md5 message digest
851 (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500852 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
853 loop, loopw, mtest
854 CONFIG_CMD_MISC Misc functions like sleep etc
855 CONFIG_CMD_MMC * MMC memory mapped support
856 CONFIG_CMD_MII * MII utility commands
Stefan Roese68d7d652009-03-19 13:30:36 +0100857 CONFIG_CMD_MTDPARTS * MTD partition support
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500858 CONFIG_CMD_NAND * NAND support
859 CONFIG_CMD_NET bootp, tftpboot, rarpboot
Peter Tysere92739d2008-12-17 16:36:21 -0600860 CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
Wolfgang Denkc0f40852011-10-26 10:21:21 +0000861 CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500862 CONFIG_CMD_PCI * pciinfo
863 CONFIG_CMD_PCMCIA * PCMCIA support
864 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
865 host
866 CONFIG_CMD_PORTIO * Port I/O
Kenneth Watersff048ea2012-12-05 14:46:30 +0000867 CONFIG_CMD_READ * Read raw data from partition
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500868 CONFIG_CMD_REGINFO * Register dump
869 CONFIG_CMD_RUN run command in env variable
870 CONFIG_CMD_SAVES * save S record dump
871 CONFIG_CMD_SCSI * SCSI Support
872 CONFIG_CMD_SDRAM * print SDRAM configuration information
873 (requires CONFIG_CMD_I2C)
874 CONFIG_CMD_SETGETDCR Support for DCR Register access
875 (4xx only)
Eric Nelsonf61ec452012-01-31 10:52:08 -0700876 CONFIG_CMD_SF * Read/write/erase SPI NOR flash
Alexander Hollerc6b1ee62011-01-18 09:48:08 +0100877 CONFIG_CMD_SHA1SUM print sha1 memory digest
Robin Getz02c9aa12009-07-27 00:07:59 -0400878 (requires CONFIG_CMD_MEMORY)
Wolfgang Denk74de7ae2009-04-01 23:34:12 +0200879 CONFIG_CMD_SOURCE "source" command Support
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500880 CONFIG_CMD_SPI * SPI serial bus support
Luca Ceresoli7a83af02011-05-17 00:03:40 +0000881 CONFIG_CMD_TFTPSRV * TFTP transfer in server mode
Simon Glass1fb7cd42011-10-24 18:00:07 +0000882 CONFIG_CMD_TFTPPUT * TFTP put command (upload)
Joe Hershbergerda83bcd2012-10-03 12:14:57 +0000883 CONFIG_CMD_TIME * run command and report execution time (ARM specific)
884 CONFIG_CMD_TIMER * access to the system tick timer
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500885 CONFIG_CMD_USB * USB support
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500886 CONFIG_CMD_CDP * Cisco Discover Protocol support
Marek Vasutc8339f52012-03-31 07:47:16 +0000887 CONFIG_CMD_MFSL * Microblaze FSL support
wdenkc6097192002-11-03 00:24:07 +0000888
wdenkc6097192002-11-03 00:24:07 +0000889
890 EXAMPLE: If you want all functions except of network
891 support you can write:
892
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500893 #include "config_cmd_all.h"
894 #undef CONFIG_CMD_NET
wdenkc6097192002-11-03 00:24:07 +0000895
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400896 Other Commands:
897 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
wdenkc6097192002-11-03 00:24:07 +0000898
899 Note: Don't enable the "icache" and "dcache" commands
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500900 (configuration option CONFIG_CMD_CACHE) unless you know
wdenk43d96162003-03-06 00:02:04 +0000901 what you (and your U-Boot users) are doing. Data
902 cache cannot be enabled on systems like the 8xx or
903 8260 (where accesses to the IMMR region must be
904 uncached), and it cannot be disabled on all other
905 systems where we (mis-) use the data cache to hold an
906 initial stack and some data.
wdenkc6097192002-11-03 00:24:07 +0000907
908
909 XXX - this list needs to get updated!
910
Simon Glass45ba8072011-10-15 05:48:20 +0000911- Device tree:
912 CONFIG_OF_CONTROL
913 If this variable is defined, U-Boot will use a device tree
914 to configure its devices, instead of relying on statically
915 compiled #defines in the board file. This option is
916 experimental and only available on a few boards. The device
917 tree is available in the global data as gd->fdt_blob.
918
Simon Glass2c0f79e2011-10-24 19:15:31 +0000919 U-Boot needs to get its device tree from somewhere. This can
920 be done using one of the two options below:
Simon Glassbbb0b122011-10-15 05:48:21 +0000921
922 CONFIG_OF_EMBED
923 If this variable is defined, U-Boot will embed a device tree
924 binary in its image. This device tree file should be in the
925 board directory and called <soc>-<board>.dts. The binary file
926 is then picked up in board_init_f() and made available through
927 the global data structure as gd->blob.
Simon Glass45ba8072011-10-15 05:48:20 +0000928
Simon Glass2c0f79e2011-10-24 19:15:31 +0000929 CONFIG_OF_SEPARATE
930 If this variable is defined, U-Boot will build a device tree
931 binary. It will be called u-boot.dtb. Architecture-specific
932 code will locate it at run-time. Generally this works by:
933
934 cat u-boot.bin u-boot.dtb >image.bin
935
936 and in fact, U-Boot does this for you, creating a file called
937 u-boot-dtb.bin which is useful in the common case. You can
938 still use the individual files if you need something more
939 exotic.
940
wdenkc6097192002-11-03 00:24:07 +0000941- Watchdog:
942 CONFIG_WATCHDOG
943 If this variable is defined, it enables watchdog
Detlev Zundel6abe6fb2011-04-27 05:25:59 +0000944 support for the SoC. There must be support in the SoC
945 specific code for a watchdog. For the 8xx and 8260
946 CPUs, the SIU Watchdog feature is enabled in the SYPCR
947 register. When supported for a specific SoC is
948 available, then no further board specific code should
949 be needed to use it.
950
951 CONFIG_HW_WATCHDOG
952 When using a watchdog circuitry external to the used
953 SoC, then define this variable and provide board
954 specific code for the "hw_watchdog_reset" function.
wdenkc6097192002-11-03 00:24:07 +0000955
stroesec1551ea2003-04-04 15:53:41 +0000956- U-Boot Version:
957 CONFIG_VERSION_VARIABLE
958 If this variable is defined, an environment variable
959 named "ver" is created by U-Boot showing the U-Boot
960 version as printed by the "version" command.
Benoît Thébaudeaua1ea8e52012-08-13 15:01:14 +0200961 Any change to this variable will be reverted at the
962 next reset.
stroesec1551ea2003-04-04 15:53:41 +0000963
wdenkc6097192002-11-03 00:24:07 +0000964- Real-Time Clock:
965
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500966 When CONFIG_CMD_DATE is selected, the type of the RTC
wdenkc6097192002-11-03 00:24:07 +0000967 has to be selected, too. Define exactly one of the
968 following options:
969
970 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
971 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
Fabio Estevam4e8b7542011-10-24 06:44:15 +0000972 CONFIG_RTC_MC13XXX - use MC13783 or MC13892 RTC
wdenkc6097192002-11-03 00:24:07 +0000973 CONFIG_RTC_MC146818 - use MC146818 RTC
wdenk1cb8e982003-03-06 21:55:29 +0000974 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
wdenkc6097192002-11-03 00:24:07 +0000975 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
wdenk7f70e852003-05-20 14:25:27 +0000976 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
wdenk3bac3512003-03-12 10:41:04 +0000977 CONFIG_RTC_DS164x - use Dallas DS164x RTC
Tor Krill9536dfc2008-03-15 15:40:26 +0100978 CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
wdenk4c0d4c32004-06-09 17:34:58 +0000979 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200980 CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
Heiko Schocher71d19f32011-03-28 09:24:22 +0200981 CONFIG_SYS_RV3029_TCR - enable trickle charger on
982 RV3029 RTC.
wdenkc6097192002-11-03 00:24:07 +0000983
wdenkb37c7e52003-06-30 16:24:52 +0000984 Note that if the RTC uses I2C, then the I2C interface
985 must also be configured. See I2C Support, below.
986
Peter Tysere92739d2008-12-17 16:36:21 -0600987- GPIO Support:
988 CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
989 CONFIG_PCA953X_INFO - enable pca953x info command
990
Chris Packham5dec49c2010-12-19 10:12:13 +0000991 The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
992 chip-ngpio pairs that tell the PCA953X driver the number of
993 pins supported by a particular chip.
994
Peter Tysere92739d2008-12-17 16:36:21 -0600995 Note that if the GPIO device uses I2C, then the I2C interface
996 must also be configured. See I2C Support, below.
997
wdenkc6097192002-11-03 00:24:07 +0000998- Timestamp Support:
999
wdenk43d96162003-03-06 00:02:04 +00001000 When CONFIG_TIMESTAMP is selected, the timestamp
1001 (date and time) of an image is printed by image
1002 commands like bootm or iminfo. This option is
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001003 automatically enabled when you select CONFIG_CMD_DATE .
wdenkc6097192002-11-03 00:24:07 +00001004
Karl O. Pinc923c46f2012-08-16 06:20:15 +00001005- Partition Labels (disklabels) Supported:
1006 Zero or more of the following:
1007 CONFIG_MAC_PARTITION Apple's MacOS partition table.
1008 CONFIG_DOS_PARTITION MS Dos partition table, traditional on the
1009 Intel architecture, USB sticks, etc.
1010 CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc.
1011 CONFIG_EFI_PARTITION GPT partition table, common when EFI is the
1012 bootloader. Note 2TB partition limit; see
1013 disk/part_efi.c
1014 CONFIG_MTD_PARTITIONS Memory Technology Device partition table.
wdenkc6097192002-11-03 00:24:07 +00001015
Wolfgang Denk218ca722008-03-26 10:40:12 +01001016 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1017 CONFIG_CMD_SCSI) you must configure support for at
Karl O. Pinc923c46f2012-08-16 06:20:15 +00001018 least one non-MTD partition type as well.
wdenkc6097192002-11-03 00:24:07 +00001019
1020- IDE Reset method:
wdenk4d13cba2004-03-14 14:09:05 +00001021 CONFIG_IDE_RESET_ROUTINE - this is defined in several
1022 board configurations files but used nowhere!
wdenkc6097192002-11-03 00:24:07 +00001023
wdenk4d13cba2004-03-14 14:09:05 +00001024 CONFIG_IDE_RESET - is this is defined, IDE Reset will
1025 be performed by calling the function
1026 ide_set_reset(int reset)
1027 which has to be defined in a board specific file
wdenkc6097192002-11-03 00:24:07 +00001028
1029- ATAPI Support:
1030 CONFIG_ATAPI
1031
1032 Set this to enable ATAPI support.
1033
wdenkc40b2952004-03-13 23:29:43 +00001034- LBA48 Support
1035 CONFIG_LBA48
1036
1037 Set this to enable support for disks larger than 137GB
Heiko Schocher4b142fe2009-12-03 11:21:21 +01001038 Also look at CONFIG_SYS_64BIT_LBA.
wdenkc40b2952004-03-13 23:29:43 +00001039 Whithout these , LBA48 support uses 32bit variables and will 'only'
1040 support disks up to 2.1TB.
1041
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001042 CONFIG_SYS_64BIT_LBA:
wdenkc40b2952004-03-13 23:29:43 +00001043 When enabled, makes the IDE subsystem use 64bit sector addresses.
1044 Default is 32bit.
1045
wdenkc6097192002-11-03 00:24:07 +00001046- SCSI Support:
1047 At the moment only there is only support for the
1048 SYM53C8XX SCSI controller; define
1049 CONFIG_SCSI_SYM53C8XX to enable it.
1050
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001051 CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
1052 CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
1053 CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
wdenkc6097192002-11-03 00:24:07 +00001054 maximum numbers of LUNs, SCSI ID's and target
1055 devices.
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001056 CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
wdenkc6097192002-11-03 00:24:07 +00001057
Stefan Reinauer447c0312012-10-29 05:23:48 +00001058 The environment variable 'scsidevs' is set to the number of
1059 SCSI devices found during the last scan.
1060
wdenkc6097192002-11-03 00:24:07 +00001061- NETWORK Support (PCI):
wdenk682011f2003-06-03 23:54:09 +00001062 CONFIG_E1000
Kyle Moffettce5207e2011-10-18 11:05:29 +00001063 Support for Intel 8254x/8257x gigabit chips.
1064
1065 CONFIG_E1000_SPI
1066 Utility code for direct access to the SPI bus on Intel 8257x.
1067 This does not do anything useful unless you set at least one
1068 of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1069
1070 CONFIG_E1000_SPI_GENERIC
1071 Allow generic access to the SPI bus on the Intel 8257x, for
1072 example with the "sspi" command.
1073
1074 CONFIG_CMD_E1000
1075 Management command for E1000 devices. When used on devices
1076 with SPI support you can reprogram the EEPROM from U-Boot.
stroese53cf9432003-06-05 15:39:44 +00001077
Andre Schwarzac3315c2008-03-06 16:45:44 +01001078 CONFIG_E1000_FALLBACK_MAC
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001079 default MAC for empty EEPROM after production.
Andre Schwarzac3315c2008-03-06 16:45:44 +01001080
wdenkc6097192002-11-03 00:24:07 +00001081 CONFIG_EEPRO100
1082 Support for Intel 82557/82559/82559ER chips.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001083 Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
wdenkc6097192002-11-03 00:24:07 +00001084 write routine for first time initialisation.
1085
1086 CONFIG_TULIP
1087 Support for Digital 2114x chips.
1088 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1089 modem chip initialisation (KS8761/QS6611).
1090
1091 CONFIG_NATSEMI
1092 Support for National dp83815 chips.
1093
1094 CONFIG_NS8382X
1095 Support for National dp8382[01] gigabit chips.
1096
wdenk45219c42003-05-12 21:50:16 +00001097- NETWORK Support (other):
1098
Jens Scharsigc041e9d2010-01-23 12:03:45 +01001099 CONFIG_DRIVER_AT91EMAC
1100 Support for AT91RM9200 EMAC.
1101
1102 CONFIG_RMII
1103 Define this to use reduced MII inteface
1104
1105 CONFIG_DRIVER_AT91EMAC_QUIET
1106 If this defined, the driver is quiet.
1107 The driver doen't show link status messages.
1108
Rob Herringefdd7312011-12-15 11:15:49 +00001109 CONFIG_CALXEDA_XGMAC
1110 Support for the Calxeda XGMAC device
1111
Ashok3bb46d22012-10-15 06:20:47 +00001112 CONFIG_LAN91C96
wdenk45219c42003-05-12 21:50:16 +00001113 Support for SMSC's LAN91C96 chips.
1114
1115 CONFIG_LAN91C96_BASE
1116 Define this to hold the physical address
1117 of the LAN91C96's I/O space
1118
1119 CONFIG_LAN91C96_USE_32_BIT
1120 Define this to enable 32 bit addressing
1121
Ashok3bb46d22012-10-15 06:20:47 +00001122 CONFIG_SMC91111
wdenkf39748a2004-06-09 13:37:52 +00001123 Support for SMSC's LAN91C111 chip
1124
1125 CONFIG_SMC91111_BASE
1126 Define this to hold the physical address
1127 of the device (I/O space)
1128
1129 CONFIG_SMC_USE_32_BIT
1130 Define this if data bus is 32 bits
1131
1132 CONFIG_SMC_USE_IOFUNCS
1133 Define this to use i/o functions instead of macros
1134 (some hardware wont work with macros)
1135
Heiko Schocherdc02bad2011-11-15 10:00:04 -05001136 CONFIG_DRIVER_TI_EMAC
1137 Support for davinci emac
1138
1139 CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1140 Define this if you have more then 3 PHYs.
1141
Macpaul Linb3dbf4a52010-12-21 16:59:46 +08001142 CONFIG_FTGMAC100
1143 Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1144
1145 CONFIG_FTGMAC100_EGIGA
1146 Define this to use GE link update with gigabit PHY.
1147 Define this if FTGMAC100 is connected to gigabit PHY.
1148 If your system has 10/100 PHY only, it might not occur
1149 wrong behavior. Because PHY usually return timeout or
1150 useless data when polling gigabit status and gigabit
1151 control registers. This behavior won't affect the
1152 correctnessof 10/100 link speed update.
1153
Mike Rapoportc2fff332009-11-11 10:03:03 +02001154 CONFIG_SMC911X
Jens Gehrlein557b3772008-05-05 14:06:11 +02001155 Support for SMSC's LAN911x and LAN921x chips
1156
Mike Rapoportc2fff332009-11-11 10:03:03 +02001157 CONFIG_SMC911X_BASE
Jens Gehrlein557b3772008-05-05 14:06:11 +02001158 Define this to hold the physical address
1159 of the device (I/O space)
1160
Mike Rapoportc2fff332009-11-11 10:03:03 +02001161 CONFIG_SMC911X_32_BIT
Jens Gehrlein557b3772008-05-05 14:06:11 +02001162 Define this if data bus is 32 bits
1163
Mike Rapoportc2fff332009-11-11 10:03:03 +02001164 CONFIG_SMC911X_16_BIT
Jens Gehrlein557b3772008-05-05 14:06:11 +02001165 Define this if data bus is 16 bits. If your processor
1166 automatically converts one 32 bit word to two 16 bit
Mike Rapoportc2fff332009-11-11 10:03:03 +02001167 words you may also try CONFIG_SMC911X_32_BIT.
Jens Gehrlein557b3772008-05-05 14:06:11 +02001168
Yoshihiro Shimoda3d0075f2011-01-27 10:06:03 +09001169 CONFIG_SH_ETHER
1170 Support for Renesas on-chip Ethernet controller
1171
1172 CONFIG_SH_ETHER_USE_PORT
1173 Define the number of ports to be used
1174
1175 CONFIG_SH_ETHER_PHY_ADDR
1176 Define the ETH PHY's address
1177
Yoshihiro Shimoda68260aa2011-01-27 10:06:08 +09001178 CONFIG_SH_ETHER_CACHE_WRITEBACK
1179 If this option is set, the driver enables cache flush.
1180
Vadim Bendebury5e124722011-10-17 08:36:14 +00001181- TPM Support:
1182 CONFIG_GENERIC_LPC_TPM
1183 Support for generic parallel port TPM devices. Only one device
1184 per system is supported at this time.
1185
1186 CONFIG_TPM_TIS_BASE_ADDRESS
1187 Base address where the generic TPM device is mapped
1188 to. Contemporary x86 systems usually map it at
1189 0xfed40000.
1190
wdenkc6097192002-11-03 00:24:07 +00001191- USB Support:
1192 At the moment only the UHCI host controller is
wdenk4d13cba2004-03-14 14:09:05 +00001193 supported (PIP405, MIP405, MPC5200); define
wdenkc6097192002-11-03 00:24:07 +00001194 CONFIG_USB_UHCI to enable it.
1195 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
wdenk30d56fa2004-10-09 22:44:59 +00001196 and define CONFIG_USB_STORAGE to enable the USB
wdenkc6097192002-11-03 00:24:07 +00001197 storage devices.
1198 Note:
1199 Supported are USB Keyboards and USB Floppy drives
1200 (TEAC FD-05PUB).
wdenk4d13cba2004-03-14 14:09:05 +00001201 MPC5200 USB requires additional defines:
1202 CONFIG_USB_CLOCK
1203 for 528 MHz Clock: 0x0001bbbb
Eric Millbrandt307ecb62009-08-13 08:32:37 -05001204 CONFIG_PSC3_USB
1205 for USB on PSC3
wdenk4d13cba2004-03-14 14:09:05 +00001206 CONFIG_USB_CONFIG
1207 for differential drivers: 0x00001000
1208 for single ended drivers: 0x00005000
Eric Millbrandt307ecb62009-08-13 08:32:37 -05001209 for differential drivers on PSC3: 0x00000100
1210 for single ended drivers on PSC3: 0x00004100
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001211 CONFIG_SYS_USB_EVENT_POLL
Zhang Weifdcfaa12007-06-06 10:08:13 +02001212 May be defined to allow interrupt polling
1213 instead of using asynchronous interrupts
wdenk4d13cba2004-03-14 14:09:05 +00001214
Simon Glass9ab4ce22012-02-27 10:52:47 +00001215 CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
1216 txfilltuning field in the EHCI controller on reset.
1217
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001218- USB Device:
1219 Define the below if you wish to use the USB console.
1220 Once firmware is rebuilt from a serial console issue the
1221 command "setenv stdin usbtty; setenv stdout usbtty" and
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001222 attach your USB cable. The Unix command "dmesg" should print
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001223 it has found a new device. The environment variable usbtty
1224 can be set to gserial or cdc_acm to enable your device to
Wolfgang Denk386eda02006-06-14 18:14:56 +02001225 appear to a USB host as a Linux gserial device or a
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001226 Common Device Class Abstract Control Model serial device.
1227 If you select usbtty = gserial you should be able to enumerate
1228 a Linux host by
1229 # modprobe usbserial vendor=0xVendorID product=0xProductID
1230 else if using cdc_acm, simply setting the environment
1231 variable usbtty to be cdc_acm should suffice. The following
1232 might be defined in YourBoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +02001233
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001234 CONFIG_USB_DEVICE
1235 Define this to build a UDC device
wdenkc6097192002-11-03 00:24:07 +00001236
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001237 CONFIG_USB_TTY
1238 Define this to have a tty type of device available to
1239 talk to the UDC device
Wolfgang Denk386eda02006-06-14 18:14:56 +02001240
Vipin KUMARf9da0f82012-03-26 15:38:06 +05301241 CONFIG_USBD_HS
1242 Define this to enable the high speed support for usb
1243 device and usbtty. If this feature is enabled, a routine
1244 int is_usbd_high_speed(void)
1245 also needs to be defined by the driver to dynamically poll
1246 whether the enumeration has succeded at high speed or full
1247 speed.
1248
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001249 CONFIG_SYS_CONSOLE_IS_IN_ENV
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001250 Define this if you want stdin, stdout &/or stderr to
1251 be set to usbtty.
1252
1253 mpc8xx:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001254 CONFIG_SYS_USB_EXTC_CLK 0xBLAH
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001255 Derive USB clock from external clock "blah"
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001256 - CONFIG_SYS_USB_EXTC_CLK 0x02
Wolfgang Denk386eda02006-06-14 18:14:56 +02001257
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001258 CONFIG_SYS_USB_BRG_CLK 0xBLAH
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001259 Derive USB clock from brgclk
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001260 - CONFIG_SYS_USB_BRG_CLK 0x04
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001261
Wolfgang Denk386eda02006-06-14 18:14:56 +02001262 If you have a USB-IF assigned VendorID then you may wish to
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001263 define your own vendor specific values either in BoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +02001264 or directly in usbd_vendor_info.h. If you don't define
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001265 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
1266 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
1267 should pretend to be a Linux device to it's target host.
1268
1269 CONFIG_USBD_MANUFACTURER
1270 Define this string as the name of your company for
1271 - CONFIG_USBD_MANUFACTURER "my company"
Wolfgang Denk386eda02006-06-14 18:14:56 +02001272
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001273 CONFIG_USBD_PRODUCT_NAME
1274 Define this string as the name of your product
1275 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
1276
1277 CONFIG_USBD_VENDORID
1278 Define this as your assigned Vendor ID from the USB
1279 Implementors Forum. This *must* be a genuine Vendor ID
1280 to avoid polluting the USB namespace.
1281 - CONFIG_USBD_VENDORID 0xFFFF
Wolfgang Denk386eda02006-06-14 18:14:56 +02001282
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +02001283 CONFIG_USBD_PRODUCTID
1284 Define this as the unique Product ID
1285 for your device
1286 - CONFIG_USBD_PRODUCTID 0xFFFF
wdenkc6097192002-11-03 00:24:07 +00001287
Igor Grinbergd70a5602011-12-12 12:08:35 +02001288- ULPI Layer Support:
1289 The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1290 the generic ULPI layer. The generic layer accesses the ULPI PHY
1291 via the platform viewport, so you need both the genric layer and
1292 the viewport enabled. Currently only Chipidea/ARC based
1293 viewport is supported.
1294 To enable the ULPI layer support, define CONFIG_USB_ULPI and
1295 CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
Lucas Stach6d365ea2012-10-01 00:44:35 +02001296 If your ULPI phy needs a different reference clock than the
1297 standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
1298 the appropriate value in Hz.
wdenkc6097192002-11-03 00:24:07 +00001299
1300- MMC Support:
1301 The MMC controller on the Intel PXA is supported. To
1302 enable this define CONFIG_MMC. The MMC can be
1303 accessed from the boot prompt by mapping the device
1304 to physical memory similar to flash. Command line is
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001305 enabled with CONFIG_CMD_MMC. The MMC driver also works with
1306 the FAT fs. This is enabled with CONFIG_CMD_FAT.
wdenkc6097192002-11-03 00:24:07 +00001307
Yoshihiro Shimodaafb35662011-07-04 22:21:22 +00001308 CONFIG_SH_MMCIF
1309 Support for Renesas on-chip MMCIF controller
1310
1311 CONFIG_SH_MMCIF_ADDR
1312 Define the base address of MMCIF registers
1313
1314 CONFIG_SH_MMCIF_CLK
1315 Define the clock frequency for MMCIF
1316
wdenk6705d812004-08-02 23:22:59 +00001317- Journaling Flash filesystem support:
1318 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
1319 CONFIG_JFFS2_NAND_DEV
1320 Define these for a default partition on a NAND device
1321
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001322 CONFIG_SYS_JFFS2_FIRST_SECTOR,
1323 CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
wdenk6705d812004-08-02 23:22:59 +00001324 Define these for a default partition on a NOR device
1325
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001326 CONFIG_SYS_JFFS_CUSTOM_PART
wdenk6705d812004-08-02 23:22:59 +00001327 Define this to create an own partition. You have to provide a
1328 function struct part_info* jffs2_part_info(int part_num)
1329
1330 If you define only one JFFS2 partition you may also want to
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001331 #define CONFIG_SYS_JFFS_SINGLE_PART 1
wdenk6705d812004-08-02 23:22:59 +00001332 to disable the command chpart. This is the default when you
1333 have not defined a custom partition
1334
Donggeun Kimc30a15e2011-10-24 21:15:28 +00001335- FAT(File Allocation Table) filesystem write function support:
1336 CONFIG_FAT_WRITE
Donggeun Kim656f4c62012-03-22 04:38:56 +00001337
1338 Define this to enable support for saving memory data as a
1339 file in FAT formatted partition.
1340
1341 This will also enable the command "fatwrite" enabling the
1342 user to write files to FAT.
Donggeun Kimc30a15e2011-10-24 21:15:28 +00001343
Gabe Black84cd9322012-10-12 14:26:11 +00001344CBFS (Coreboot Filesystem) support
1345 CONFIG_CMD_CBFS
1346
1347 Define this to enable support for reading from a Coreboot
1348 filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
1349 and cbfsload.
1350
wdenkc6097192002-11-03 00:24:07 +00001351- Keyboard Support:
1352 CONFIG_ISA_KEYBOARD
1353
1354 Define this to enable standard (PC-Style) keyboard
1355 support
1356
1357 CONFIG_I8042_KBD
1358 Standard PC keyboard driver with US (is default) and
1359 GERMAN key layout (switch via environment 'keymap=de') support.
1360 Export function i8042_kbd_init, i8042_tstc and i8042_getc
1361 for cfb_console. Supports cursor blinking.
1362
1363- Video support:
1364 CONFIG_VIDEO
1365
1366 Define this to enable video support (for output to
1367 video).
1368
1369 CONFIG_VIDEO_CT69000
1370
1371 Enable Chips & Technologies 69000 Video chip
1372
1373 CONFIG_VIDEO_SMI_LYNXEM
wdenkb79a11c2004-03-25 15:14:43 +00001374 Enable Silicon Motion SMI 712/710/810 Video chip. The
wdenkeeb1b772004-03-23 22:53:55 +00001375 video output is selected via environment 'videoout'
1376 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1377 assumed.
wdenkc6097192002-11-03 00:24:07 +00001378
wdenkb79a11c2004-03-25 15:14:43 +00001379 For the CT69000 and SMI_LYNXEM drivers, videomode is
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001380 selected via environment 'videomode'. Two different ways
wdenkeeb1b772004-03-23 22:53:55 +00001381 are possible:
1382 - "videomode=num" 'num' is a standard LiLo mode numbers.
wdenk6e592382004-04-18 17:39:38 +00001383 Following standard modes are supported (* is default):
wdenkeeb1b772004-03-23 22:53:55 +00001384
1385 Colors 640x480 800x600 1024x768 1152x864 1280x1024
1386 -------------+---------------------------------------------
1387 8 bits | 0x301* 0x303 0x305 0x161 0x307
1388 15 bits | 0x310 0x313 0x316 0x162 0x319
1389 16 bits | 0x311 0x314 0x317 0x163 0x31A
1390 24 bits | 0x312 0x315 0x318 ? 0x31B
1391 -------------+---------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00001392 (i.e. setenv videomode 317; saveenv; reset;)
1393
wdenkb79a11c2004-03-25 15:14:43 +00001394 - "videomode=bootargs" all the video parameters are parsed
Marcel Ziswiler7817cb22007-12-30 03:30:46 +01001395 from the bootargs. (See drivers/video/videomodes.c)
wdenkeeb1b772004-03-23 22:53:55 +00001396
1397
stroesec1551ea2003-04-04 15:53:41 +00001398 CONFIG_VIDEO_SED13806
wdenk43d96162003-03-06 00:02:04 +00001399 Enable Epson SED13806 driver. This driver supports 8bpp
wdenka6c7ad22002-12-03 21:28:10 +00001400 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1401 or CONFIG_VIDEO_SED13806_16BPP
1402
Timur Tabi7d3053f2011-02-15 17:09:19 -06001403 CONFIG_FSL_DIU_FB
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02001404 Enable the Freescale DIU video driver. Reference boards for
Timur Tabi7d3053f2011-02-15 17:09:19 -06001405 SOCs that have a DIU should define this macro to enable DIU
1406 support, and should also define these other macros:
1407
1408 CONFIG_SYS_DIU_ADDR
1409 CONFIG_VIDEO
1410 CONFIG_CMD_BMP
1411 CONFIG_CFB_CONSOLE
1412 CONFIG_VIDEO_SW_CURSOR
1413 CONFIG_VGA_AS_SINGLE_DEVICE
1414 CONFIG_VIDEO_LOGO
1415 CONFIG_VIDEO_BMP_LOGO
1416
Timur Tabiba8e76b2011-04-11 14:18:22 -05001417 The DIU driver will look for the 'video-mode' environment
1418 variable, and if defined, enable the DIU as a console during
1419 boot. See the documentation file README.video for a
1420 description of this variable.
Timur Tabi7d3053f2011-02-15 17:09:19 -06001421
Simon Glass058d59b2012-12-03 13:59:47 +00001422 CONFIG_VIDEO_VGA
1423
1424 Enable the VGA video / BIOS for x86. The alternative if you
1425 are using coreboot is to use the coreboot frame buffer
1426 driver.
1427
1428
wdenk682011f2003-06-03 23:54:09 +00001429- Keyboard Support:
wdenk8bde7f72003-06-27 21:31:46 +00001430 CONFIG_KEYBOARD
wdenk682011f2003-06-03 23:54:09 +00001431
wdenk8bde7f72003-06-27 21:31:46 +00001432 Define this to enable a custom keyboard support.
1433 This simply calls drv_keyboard_init() which must be
1434 defined in your board-specific files.
1435 The only board using this so far is RBC823.
wdenka6c7ad22002-12-03 21:28:10 +00001436
wdenkc6097192002-11-03 00:24:07 +00001437- LCD Support: CONFIG_LCD
1438
1439 Define this to enable LCD support (for output to LCD
1440 display); also select one of the supported displays
1441 by defining one of these:
1442
Stelian Pop39cf4802008-05-09 21:57:18 +02001443 CONFIG_ATMEL_LCD:
1444
1445 HITACHI TX09D70VM1CCA, 3.5", 240x320.
1446
wdenkfd3103b2003-11-25 16:55:19 +00001447 CONFIG_NEC_NL6448AC33:
wdenkc6097192002-11-03 00:24:07 +00001448
wdenkfd3103b2003-11-25 16:55:19 +00001449 NEC NL6448AC33-18. Active, color, single scan.
wdenkc6097192002-11-03 00:24:07 +00001450
wdenkfd3103b2003-11-25 16:55:19 +00001451 CONFIG_NEC_NL6448BC20
wdenkc6097192002-11-03 00:24:07 +00001452
wdenkfd3103b2003-11-25 16:55:19 +00001453 NEC NL6448BC20-08. 6.5", 640x480.
1454 Active, color, single scan.
1455
1456 CONFIG_NEC_NL6448BC33_54
1457
1458 NEC NL6448BC33-54. 10.4", 640x480.
wdenkc6097192002-11-03 00:24:07 +00001459 Active, color, single scan.
1460
1461 CONFIG_SHARP_16x9
1462
1463 Sharp 320x240. Active, color, single scan.
1464 It isn't 16x9, and I am not sure what it is.
1465
1466 CONFIG_SHARP_LQ64D341
1467
1468 Sharp LQ64D341 display, 640x480.
1469 Active, color, single scan.
1470
1471 CONFIG_HLD1045
1472
1473 HLD1045 display, 640x480.
1474 Active, color, single scan.
1475
1476 CONFIG_OPTREX_BW
1477
1478 Optrex CBL50840-2 NF-FW 99 22 M5
1479 or
1480 Hitachi LMG6912RPFC-00T
1481 or
1482 Hitachi SP14Q002
1483
1484 320x240. Black & white.
1485
1486 Normally display is black on white background; define
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001487 CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
wdenkc6097192002-11-03 00:24:07 +00001488
Simon Glass676d3192012-10-17 13:24:54 +00001489 CONFIG_LCD_ALIGNMENT
1490
1491 Normally the LCD is page-aligned (tyically 4KB). If this is
1492 defined then the LCD will be aligned to this value instead.
1493 For ARM it is sometimes useful to use MMU_SECTION_SIZE
1494 here, since it is cheaper to change data cache settings on
1495 a per-section basis.
1496
Simon Glass0d89efe2012-10-17 13:24:59 +00001497 CONFIG_CONSOLE_SCROLL_LINES
1498
1499 When the console need to be scrolled, this is the number of
1500 lines to scroll by. It defaults to 1. Increasing this makes
1501 the console jump but can help speed up operation when scrolling
1502 is slow.
Simon Glass676d3192012-10-17 13:24:54 +00001503
Tom Wai-Hong Tam45d7f522012-09-28 15:11:16 +00001504 CONFIG_LCD_BMP_RLE8
1505
1506 Support drawing of RLE8-compressed bitmaps on the LCD.
1507
Tom Wai-Hong Tam735987c2012-12-05 14:46:40 +00001508 CONFIG_I2C_EDID
1509
1510 Enables an 'i2c edid' command which can read EDID
1511 information over I2C from an attached LCD display.
1512
wdenk7152b1d2003-09-05 23:19:14 +00001513- Splash Screen Support: CONFIG_SPLASH_SCREEN
wdenkd791b1d2003-04-20 14:04:18 +00001514
wdenk8bde7f72003-06-27 21:31:46 +00001515 If this option is set, the environment is checked for
1516 a variable "splashimage". If found, the usual display
1517 of logo, copyright and system information on the LCD
wdenke94d2cd2004-06-30 22:59:18 +00001518 is suppressed and the BMP image at the address
wdenk8bde7f72003-06-27 21:31:46 +00001519 specified in "splashimage" is loaded instead. The
1520 console is redirected to the "nulldev", too. This
1521 allows for a "silent" boot where a splash screen is
1522 loaded very quickly after power-on.
wdenkd791b1d2003-04-20 14:04:18 +00001523
Matthias Weisser1ca298c2009-07-09 16:07:30 +02001524 CONFIG_SPLASH_SCREEN_ALIGN
1525
1526 If this option is set the splash image can be freely positioned
1527 on the screen. Environment variable "splashpos" specifies the
1528 position as "x,y". If a positive number is given it is used as
1529 number of pixel from left/top. If a negative number is given it
1530 is used as number of pixel from right/bottom. You can also
1531 specify 'm' for centering the image.
1532
1533 Example:
1534 setenv splashpos m,m
1535 => image at center of screen
1536
1537 setenv splashpos 30,20
1538 => image at x = 30 and y = 20
1539
1540 setenv splashpos -10,m
1541 => vertically centered image
1542 at x = dspWidth - bmpWidth - 9
1543
Stefan Roese98f4a3d2005-09-22 09:04:17 +02001544- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
1545
1546 If this option is set, additionally to standard BMP
1547 images, gzipped BMP images can be displayed via the
1548 splashscreen support or the bmp command.
1549
Anatolij Gustschind5011762010-03-15 14:50:25 +01001550- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1551
1552 If this option is set, 8-bit RLE compressed BMP images
1553 can be displayed via the splashscreen support or the
1554 bmp command.
1555
Lei Wenf2b96df2012-09-28 04:26:47 +00001556- Do compresssing for memory range:
1557 CONFIG_CMD_ZIP
1558
1559 If this option is set, it would use zlib deflate method
1560 to compress the specified memory at its best effort.
1561
wdenkc29fdfc2003-08-29 20:57:53 +00001562- Compression support:
1563 CONFIG_BZIP2
1564
1565 If this option is set, support for bzip2 compressed
1566 images is included. If not, only uncompressed and gzip
1567 compressed images are supported.
1568
wdenk42d1f032003-10-15 23:53:47 +00001569 NOTE: the bzip2 algorithm requires a lot of RAM, so
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001570 the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
wdenk42d1f032003-10-15 23:53:47 +00001571 be at least 4MB.
wdenkd791b1d2003-04-20 14:04:18 +00001572
Luigi 'Comio' Mantellinifc9c1722008-09-08 02:46:13 +02001573 CONFIG_LZMA
1574
1575 If this option is set, support for lzma compressed
1576 images is included.
1577
1578 Note: The LZMA algorithm adds between 2 and 4KB of code and it
1579 requires an amount of dynamic memory that is given by the
1580 formula:
1581
1582 (1846 + 768 << (lc + lp)) * sizeof(uint16)
1583
1584 Where lc and lp stand for, respectively, Literal context bits
1585 and Literal pos bits.
1586
1587 This value is upper-bounded by 14MB in the worst case. Anyway,
1588 for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1589 total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1590 a very small buffer.
1591
1592 Use the lzmainfo tool to determinate the lc and lp values and
1593 then calculate the amount of needed dynamic memory (ensuring
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001594 the appropriate CONFIG_SYS_MALLOC_LEN value).
Luigi 'Comio' Mantellinifc9c1722008-09-08 02:46:13 +02001595
wdenk17ea1172004-06-06 21:51:03 +00001596- MII/PHY support:
1597 CONFIG_PHY_ADDR
1598
1599 The address of PHY on MII bus.
1600
1601 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
1602
1603 The clock frequency of the MII bus
1604
1605 CONFIG_PHY_GIGE
1606
1607 If this option is set, support for speed/duplex
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001608 detection of gigabit PHY is included.
wdenk17ea1172004-06-06 21:51:03 +00001609
1610 CONFIG_PHY_RESET_DELAY
1611
1612 Some PHY like Intel LXT971A need extra delay after
1613 reset before any MII register access is possible.
1614 For such PHY, set this option to the usec delay
1615 required. (minimum 300usec for LXT971A)
1616
1617 CONFIG_PHY_CMD_DELAY (ppc4xx)
1618
1619 Some PHY like Intel LXT971A need extra delay after
1620 command issued before MII status register can be read
1621
wdenkc6097192002-11-03 00:24:07 +00001622- Ethernet address:
1623 CONFIG_ETHADDR
richardretanubunc68a05f2008-09-29 18:28:23 -04001624 CONFIG_ETH1ADDR
wdenkc6097192002-11-03 00:24:07 +00001625 CONFIG_ETH2ADDR
1626 CONFIG_ETH3ADDR
richardretanubunc68a05f2008-09-29 18:28:23 -04001627 CONFIG_ETH4ADDR
1628 CONFIG_ETH5ADDR
wdenkc6097192002-11-03 00:24:07 +00001629
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001630 Define a default value for Ethernet address to use
1631 for the respective Ethernet interface, in case this
wdenkc6097192002-11-03 00:24:07 +00001632 is not determined automatically.
1633
1634- IP address:
1635 CONFIG_IPADDR
1636
1637 Define a default value for the IP address to use for
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001638 the default Ethernet interface, in case this is not
wdenkc6097192002-11-03 00:24:07 +00001639 determined through e.g. bootp.
Wolfgang Denk1ebcd652011-10-26 10:21:22 +00001640 (Environment variable "ipaddr")
wdenkc6097192002-11-03 00:24:07 +00001641
1642- Server IP address:
1643 CONFIG_SERVERIP
1644
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001645 Defines a default value for the IP address of a TFTP
wdenkc6097192002-11-03 00:24:07 +00001646 server to contact when using the "tftboot" command.
Wolfgang Denk1ebcd652011-10-26 10:21:22 +00001647 (Environment variable "serverip")
wdenkc6097192002-11-03 00:24:07 +00001648
Robin Getz97cfe862009-07-21 12:15:28 -04001649 CONFIG_KEEP_SERVERADDR
1650
1651 Keeps the server's MAC address, in the env 'serveraddr'
1652 for passing to bootargs (like Linux's netconsole option)
1653
Wolfgang Denk1ebcd652011-10-26 10:21:22 +00001654- Gateway IP address:
1655 CONFIG_GATEWAYIP
1656
1657 Defines a default value for the IP address of the
1658 default router where packets to other networks are
1659 sent to.
1660 (Environment variable "gatewayip")
1661
1662- Subnet mask:
1663 CONFIG_NETMASK
1664
1665 Defines a default value for the subnet mask (or
1666 routing prefix) which is used to determine if an IP
1667 address belongs to the local subnet or needs to be
1668 forwarded through a router.
1669 (Environment variable "netmask")
1670
David Updegraff53a5c422007-06-11 10:41:07 -05001671- Multicast TFTP Mode:
1672 CONFIG_MCAST_TFTP
1673
1674 Defines whether you want to support multicast TFTP as per
1675 rfc-2090; for example to work with atftp. Lets lots of targets
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001676 tftp down the same boot image concurrently. Note: the Ethernet
David Updegraff53a5c422007-06-11 10:41:07 -05001677 driver in use must provide a function: mcast() to join/leave a
1678 multicast group.
1679
wdenkc6097192002-11-03 00:24:07 +00001680- BOOTP Recovery Mode:
1681 CONFIG_BOOTP_RANDOM_DELAY
1682
1683 If you have many targets in a network that try to
1684 boot using BOOTP, you may want to avoid that all
1685 systems send out BOOTP requests at precisely the same
1686 moment (which would happen for instance at recovery
1687 from a power failure, when all systems will try to
1688 boot, thus flooding the BOOTP server. Defining
1689 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1690 inserted before sending out BOOTP requests. The
Wolfgang Denk6c33c782007-08-06 23:21:05 +02001691 following delays are inserted then:
wdenkc6097192002-11-03 00:24:07 +00001692
1693 1st BOOTP request: delay 0 ... 1 sec
1694 2nd BOOTP request: delay 0 ... 2 sec
1695 3rd BOOTP request: delay 0 ... 4 sec
1696 4th and following
1697 BOOTP requests: delay 0 ... 8 sec
1698
stroesefe389a82003-08-28 14:17:32 +00001699- DHCP Advanced Options:
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001700 You can fine tune the DHCP functionality by defining
1701 CONFIG_BOOTP_* symbols:
stroesefe389a82003-08-28 14:17:32 +00001702
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001703 CONFIG_BOOTP_SUBNETMASK
1704 CONFIG_BOOTP_GATEWAY
1705 CONFIG_BOOTP_HOSTNAME
1706 CONFIG_BOOTP_NISDOMAIN
1707 CONFIG_BOOTP_BOOTPATH
1708 CONFIG_BOOTP_BOOTFILESIZE
1709 CONFIG_BOOTP_DNS
1710 CONFIG_BOOTP_DNS2
1711 CONFIG_BOOTP_SEND_HOSTNAME
1712 CONFIG_BOOTP_NTPSERVER
1713 CONFIG_BOOTP_TIMEOFFSET
1714 CONFIG_BOOTP_VENDOREX
Joe Hershberger2c00e092012-05-23 07:59:19 +00001715 CONFIG_BOOTP_MAY_FAIL
stroesefe389a82003-08-28 14:17:32 +00001716
Wilson Callan5d110f02007-07-28 10:56:13 -04001717 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
1718 environment variable, not the BOOTP server.
stroesefe389a82003-08-28 14:17:32 +00001719
Joe Hershberger2c00e092012-05-23 07:59:19 +00001720 CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
1721 after the configured retry count, the call will fail
1722 instead of starting over. This can be used to fail over
1723 to Link-local IP address configuration if the DHCP server
1724 is not available.
1725
stroesefe389a82003-08-28 14:17:32 +00001726 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1727 serverip from a DHCP server, it is possible that more
1728 than one DNS serverip is offered to the client.
1729 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1730 serverip will be stored in the additional environment
1731 variable "dnsip2". The first DNS serverip is always
1732 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001733 is defined.
stroesefe389a82003-08-28 14:17:32 +00001734
1735 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1736 to do a dynamic update of a DNS server. To do this, they
1737 need the hostname of the DHCP requester.
Wilson Callan5d110f02007-07-28 10:56:13 -04001738 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001739 of the "hostname" environment variable is passed as
1740 option 12 to the DHCP server.
stroesefe389a82003-08-28 14:17:32 +00001741
Aras Vaichasd9a2f412008-03-26 09:43:57 +11001742 CONFIG_BOOTP_DHCP_REQUEST_DELAY
1743
1744 A 32bit value in microseconds for a delay between
1745 receiving a "DHCP Offer" and sending the "DHCP Request".
1746 This fixes a problem with certain DHCP servers that don't
1747 respond 100% of the time to a "DHCP request". E.g. On an
1748 AT91RM9200 processor running at 180MHz, this delay needed
1749 to be *at least* 15,000 usec before a Windows Server 2003
1750 DHCP server would reply 100% of the time. I recommend at
1751 least 50,000 usec to be safe. The alternative is to hope
1752 that one of the retries will be successful but note that
1753 the DHCP timeout and retry process takes a longer than
1754 this delay.
1755
Joe Hershbergerd22c3382012-05-23 08:00:12 +00001756 - Link-local IP address negotiation:
1757 Negotiate with other link-local clients on the local network
1758 for an address that doesn't require explicit configuration.
1759 This is especially useful if a DHCP server cannot be guaranteed
1760 to exist in all environments that the device must operate.
1761
1762 See doc/README.link-local for more information.
1763
wdenka3d991b2004-04-15 21:48:45 +00001764 - CDP Options:
wdenk6e592382004-04-18 17:39:38 +00001765 CONFIG_CDP_DEVICE_ID
wdenka3d991b2004-04-15 21:48:45 +00001766
1767 The device id used in CDP trigger frames.
1768
1769 CONFIG_CDP_DEVICE_ID_PREFIX
1770
1771 A two character string which is prefixed to the MAC address
1772 of the device.
1773
1774 CONFIG_CDP_PORT_ID
1775
1776 A printf format string which contains the ascii name of
1777 the port. Normally is set to "eth%d" which sets
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001778 eth0 for the first Ethernet, eth1 for the second etc.
wdenka3d991b2004-04-15 21:48:45 +00001779
1780 CONFIG_CDP_CAPABILITIES
1781
1782 A 32bit integer which indicates the device capabilities;
1783 0x00000010 for a normal host which does not forwards.
1784
1785 CONFIG_CDP_VERSION
1786
1787 An ascii string containing the version of the software.
1788
1789 CONFIG_CDP_PLATFORM
1790
1791 An ascii string containing the name of the platform.
1792
1793 CONFIG_CDP_TRIGGER
1794
1795 A 32bit integer sent on the trigger.
1796
1797 CONFIG_CDP_POWER_CONSUMPTION
1798
1799 A 16bit integer containing the power consumption of the
1800 device in .1 of milliwatts.
1801
1802 CONFIG_CDP_APPLIANCE_VLAN_TYPE
1803
1804 A byte containing the id of the VLAN.
1805
wdenkc6097192002-11-03 00:24:07 +00001806- Status LED: CONFIG_STATUS_LED
1807
1808 Several configurations allow to display the current
1809 status using a LED. For instance, the LED will blink
1810 fast while running U-Boot code, stop blinking as
1811 soon as a reply to a BOOTP request was received, and
1812 start blinking slow once the Linux kernel is running
1813 (supported by a status LED driver in the Linux
1814 kernel). Defining CONFIG_STATUS_LED enables this
1815 feature in U-Boot.
1816
1817- CAN Support: CONFIG_CAN_DRIVER
1818
1819 Defining CONFIG_CAN_DRIVER enables CAN driver support
1820 on those systems that support this (optional)
1821 feature, like the TQM8xxL modules.
1822
1823- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1824
wdenkb37c7e52003-06-30 16:24:52 +00001825 These enable I2C serial bus commands. Defining either of
wdenk945af8d2003-07-16 21:53:01 +00001826 (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001827 include the appropriate I2C driver for the selected CPU.
wdenkc6097192002-11-03 00:24:07 +00001828
wdenk945af8d2003-07-16 21:53:01 +00001829 This will allow you to use i2c commands at the u-boot
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001830 command line (as long as you set CONFIG_CMD_I2C in
wdenkb37c7e52003-06-30 16:24:52 +00001831 CONFIG_COMMANDS) and communicate with i2c based realtime
1832 clock chips. See common/cmd_i2c.c for a description of the
wdenk43d96162003-03-06 00:02:04 +00001833 command line interface.
wdenkc6097192002-11-03 00:24:07 +00001834
Ben Warrenbb99ad62006-09-07 16:50:54 -04001835 CONFIG_HARD_I2C selects a hardware I2C controller.
wdenkc6097192002-11-03 00:24:07 +00001836
wdenk945af8d2003-07-16 21:53:01 +00001837 CONFIG_SOFT_I2C configures u-boot to use a software (aka
wdenkb37c7e52003-06-30 16:24:52 +00001838 bit-banging) driver instead of CPM or similar hardware
1839 support for I2C.
wdenkc6097192002-11-03 00:24:07 +00001840
wdenk945af8d2003-07-16 21:53:01 +00001841 There are several other quantities that must also be
wdenkb37c7e52003-06-30 16:24:52 +00001842 defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
wdenkc6097192002-11-03 00:24:07 +00001843
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001844 In both cases you will need to define CONFIG_SYS_I2C_SPEED
wdenk945af8d2003-07-16 21:53:01 +00001845 to be the frequency (in Hz) at which you wish your i2c bus
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001846 to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001847 the CPU's i2c node address).
wdenk945af8d2003-07-16 21:53:01 +00001848
Peter Tyser8d321b82010-04-12 22:28:21 -05001849 Now, the u-boot i2c code for the mpc8xx
Stefan Roesea47a12b2010-04-15 16:07:28 +02001850 (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
Peter Tyser8d321b82010-04-12 22:28:21 -05001851 and so its address should therefore be cleared to 0 (See,
1852 eg, MPC823e User's Manual p.16-473). So, set
1853 CONFIG_SYS_I2C_SLAVE to 0.
wdenkc6097192002-11-03 00:24:07 +00001854
Eric Millbrandt5da71ef2009-09-03 08:09:44 -05001855 CONFIG_SYS_I2C_INIT_MPC5XXX
1856
1857 When a board is reset during an i2c bus transfer
1858 chips might think that the current transfer is still
1859 in progress. Reset the slave devices by sending start
1860 commands until the slave device responds.
1861
wdenk945af8d2003-07-16 21:53:01 +00001862 That's all that's required for CONFIG_HARD_I2C.
wdenkb37c7e52003-06-30 16:24:52 +00001863
1864 If you use the software i2c interface (CONFIG_SOFT_I2C)
1865 then the following macros need to be defined (examples are
1866 from include/configs/lwmon.h):
wdenkc6097192002-11-03 00:24:07 +00001867
1868 I2C_INIT
1869
wdenkb37c7e52003-06-30 16:24:52 +00001870 (Optional). Any commands necessary to enable the I2C
wdenk43d96162003-03-06 00:02:04 +00001871 controller or configure ports.
wdenkc6097192002-11-03 00:24:07 +00001872
wdenkba56f622004-02-06 23:19:44 +00001873 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
wdenkb37c7e52003-06-30 16:24:52 +00001874
wdenkc6097192002-11-03 00:24:07 +00001875 I2C_PORT
1876
wdenk43d96162003-03-06 00:02:04 +00001877 (Only for MPC8260 CPU). The I/O port to use (the code
1878 assumes both bits are on the same port). Valid values
1879 are 0..3 for ports A..D.
wdenkc6097192002-11-03 00:24:07 +00001880
1881 I2C_ACTIVE
1882
1883 The code necessary to make the I2C data line active
1884 (driven). If the data line is open collector, this
1885 define can be null.
1886
wdenkb37c7e52003-06-30 16:24:52 +00001887 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
1888
wdenkc6097192002-11-03 00:24:07 +00001889 I2C_TRISTATE
1890
1891 The code necessary to make the I2C data line tri-stated
1892 (inactive). If the data line is open collector, this
1893 define can be null.
1894
wdenkb37c7e52003-06-30 16:24:52 +00001895 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1896
wdenkc6097192002-11-03 00:24:07 +00001897 I2C_READ
1898
1899 Code that returns TRUE if the I2C data line is high,
1900 FALSE if it is low.
1901
wdenkb37c7e52003-06-30 16:24:52 +00001902 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1903
wdenkc6097192002-11-03 00:24:07 +00001904 I2C_SDA(bit)
1905
1906 If <bit> is TRUE, sets the I2C data line high. If it
1907 is FALSE, it clears it (low).
1908
wdenkb37c7e52003-06-30 16:24:52 +00001909 eg: #define I2C_SDA(bit) \
wdenk2535d602003-07-17 23:16:40 +00001910 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
wdenkba56f622004-02-06 23:19:44 +00001911 else immr->im_cpm.cp_pbdat &= ~PB_SDA
wdenkb37c7e52003-06-30 16:24:52 +00001912
wdenkc6097192002-11-03 00:24:07 +00001913 I2C_SCL(bit)
1914
1915 If <bit> is TRUE, sets the I2C clock line high. If it
1916 is FALSE, it clears it (low).
1917
wdenkb37c7e52003-06-30 16:24:52 +00001918 eg: #define I2C_SCL(bit) \
wdenk2535d602003-07-17 23:16:40 +00001919 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
wdenkba56f622004-02-06 23:19:44 +00001920 else immr->im_cpm.cp_pbdat &= ~PB_SCL
wdenkb37c7e52003-06-30 16:24:52 +00001921
wdenkc6097192002-11-03 00:24:07 +00001922 I2C_DELAY
1923
1924 This delay is invoked four times per clock cycle so this
1925 controls the rate of data transfer. The data rate thus
wdenkb37c7e52003-06-30 16:24:52 +00001926 is 1 / (I2C_DELAY * 4). Often defined to be something
wdenk945af8d2003-07-16 21:53:01 +00001927 like:
1928
wdenkb37c7e52003-06-30 16:24:52 +00001929 #define I2C_DELAY udelay(2)
wdenkc6097192002-11-03 00:24:07 +00001930
Mike Frysinger793b5722010-07-21 13:38:02 -04001931 CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1932
1933 If your arch supports the generic GPIO framework (asm/gpio.h),
1934 then you may alternatively define the two GPIOs that are to be
1935 used as SCL / SDA. Any of the previous I2C_xxx macros will
1936 have GPIO-based defaults assigned to them as appropriate.
1937
1938 You should define these to the GPIO value as given directly to
1939 the generic GPIO functions.
1940
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001941 CONFIG_SYS_I2C_INIT_BOARD
wdenk47cd00f2003-03-06 13:39:27 +00001942
wdenk8bde7f72003-06-27 21:31:46 +00001943 When a board is reset during an i2c bus transfer
1944 chips might think that the current transfer is still
1945 in progress. On some boards it is possible to access
1946 the i2c SCLK line directly, either by using the
1947 processor pin as a GPIO or by having a second pin
1948 connected to the bus. If this option is defined a
1949 custom i2c_init_board() routine in boards/xxx/board.c
1950 is run early in the boot sequence.
wdenk47cd00f2003-03-06 13:39:27 +00001951
Richard Retanubun26a33502010-04-12 15:08:17 -04001952 CONFIG_SYS_I2C_BOARD_LATE_INIT
1953
1954 An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
1955 defined a custom i2c_board_late_init() routine in
1956 boards/xxx/board.c is run AFTER the operations in i2c_init()
1957 is completed. This callpoint can be used to unreset i2c bus
1958 using CPU i2c controller register accesses for CPUs whose i2c
1959 controller provide such a method. It is called at the end of
1960 i2c_init() to allow i2c_init operations to setup the i2c bus
1961 controller on the CPU (e.g. setting bus speed & slave address).
1962
wdenk17ea1172004-06-06 21:51:03 +00001963 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
1964
1965 This option enables configuration of bi_iic_fast[] flags
1966 in u-boot bd_info structure based on u-boot environment
1967 variable "i2cfast". (see also i2cfast)
1968
Ben Warrenbb99ad62006-09-07 16:50:54 -04001969 CONFIG_I2C_MULTI_BUS
1970
1971 This option allows the use of multiple I2C buses, each of which
Wolfgang Denkc0f40852011-10-26 10:21:21 +00001972 must have a controller. At any point in time, only one bus is
1973 active. To switch to a different bus, use the 'i2c dev' command.
Ben Warrenbb99ad62006-09-07 16:50:54 -04001974 Note that bus numbering is zero-based.
1975
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001976 CONFIG_SYS_I2C_NOPROBES
Ben Warrenbb99ad62006-09-07 16:50:54 -04001977
1978 This option specifies a list of I2C devices that will be skipped
Wolfgang Denkc0f40852011-10-26 10:21:21 +00001979 when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
Peter Tyser0f89c542009-04-18 22:34:03 -05001980 is set, specify a list of bus-device pairs. Otherwise, specify
1981 a 1D array of device addresses
Ben Warrenbb99ad62006-09-07 16:50:54 -04001982
1983 e.g.
1984 #undef CONFIG_I2C_MULTI_BUS
Wolfgang Denkc0f40852011-10-26 10:21:21 +00001985 #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
Ben Warrenbb99ad62006-09-07 16:50:54 -04001986
1987 will skip addresses 0x50 and 0x68 on a board with one I2C bus
1988
Wolfgang Denkc0f40852011-10-26 10:21:21 +00001989 #define CONFIG_I2C_MULTI_BUS
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001990 #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
Ben Warrenbb99ad62006-09-07 16:50:54 -04001991
1992 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1993
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001994 CONFIG_SYS_SPD_BUS_NUM
Timur Tabibe5e6182006-11-03 19:15:00 -06001995
1996 If defined, then this indicates the I2C bus number for DDR SPD.
1997 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1998
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001999 CONFIG_SYS_RTC_BUS_NUM
Stefan Roese0dc018e2007-02-20 10:51:26 +01002000
2001 If defined, then this indicates the I2C bus number for the RTC.
2002 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
2003
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002004 CONFIG_SYS_DTT_BUS_NUM
Stefan Roese0dc018e2007-02-20 10:51:26 +01002005
2006 If defined, then this indicates the I2C bus number for the DTT.
2007 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
2008
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002009 CONFIG_SYS_I2C_DTT_ADDR:
Victor Gallardo9ebbb542008-09-09 15:13:29 -07002010
2011 If defined, specifies the I2C address of the DTT device.
2012 If not defined, then U-Boot uses predefined value for
2013 specified DTT device.
2014
Timur Tabibe5e6182006-11-03 19:15:00 -06002015 CONFIG_FSL_I2C
2016
2017 Define this option if you want to use Freescale's I2C driver in
Marcel Ziswiler7817cb22007-12-30 03:30:46 +01002018 drivers/i2c/fsl_i2c.c.
Timur Tabibe5e6182006-11-03 19:15:00 -06002019
Heiko Schocher67b23a32008-10-15 09:39:47 +02002020 CONFIG_I2C_MUX
2021
2022 Define this option if you have I2C devices reached over 1 .. n
2023 I2C Muxes like the pca9544a. This option addes a new I2C
2024 Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
2025 new I2C Bus to the existing I2C Busses. If you select the
2026 new Bus with "i2c dev", u-bbot sends first the commandos for
2027 the muxes to activate this new "bus".
2028
2029 CONFIG_I2C_MULTI_BUS must be also defined, to use this
2030 feature!
2031
2032 Example:
2033 Adding a new I2C Bus reached over 2 pca9544a muxes
2034 The First mux with address 70 and channel 6
2035 The Second mux with address 71 and channel 4
2036
2037 => i2c bus pca9544a:70:6:pca9544a:71:4
2038
2039 Use the "i2c bus" command without parameter, to get a list
2040 of I2C Busses with muxes:
2041
2042 => i2c bus
2043 Busses reached over muxes:
2044 Bus ID: 2
2045 reached over Mux(es):
2046 pca9544a@70 ch: 4
2047 Bus ID: 3
2048 reached over Mux(es):
2049 pca9544a@70 ch: 6
2050 pca9544a@71 ch: 4
2051 =>
2052
2053 If you now switch to the new I2C Bus 3 with "i2c dev 3"
Michael Jonesf9a78b82011-07-14 22:09:28 +00002054 u-boot first sends the command to the mux@70 to enable
2055 channel 6, and then the command to the mux@71 to enable
Heiko Schocher67b23a32008-10-15 09:39:47 +02002056 the channel 4.
2057
2058 After that, you can use the "normal" i2c commands as
Michael Jonesf9a78b82011-07-14 22:09:28 +00002059 usual to communicate with your I2C devices behind
Heiko Schocher67b23a32008-10-15 09:39:47 +02002060 the 2 muxes.
2061
2062 This option is actually implemented for the bitbanging
2063 algorithm in common/soft_i2c.c and for the Hardware I2C
2064 Bus on the MPC8260. But it should be not so difficult
2065 to add this option to other architectures.
2066
Andrew Dyer2ac69852008-12-29 17:36:01 -06002067 CONFIG_SOFT_I2C_READ_REPEATED_START
2068
2069 defining this will force the i2c_read() function in
2070 the soft_i2c driver to perform an I2C repeated start
2071 between writing the address pointer and reading the
2072 data. If this define is omitted the default behaviour
2073 of doing a stop-start sequence will be used. Most I2C
2074 devices can use either method, but some require one or
2075 the other.
Timur Tabibe5e6182006-11-03 19:15:00 -06002076
wdenkc6097192002-11-03 00:24:07 +00002077- SPI Support: CONFIG_SPI
2078
2079 Enables SPI driver (so far only tested with
2080 SPI EEPROM, also an instance works with Crystal A/D and
2081 D/As on the SACSng board)
2082
Yoshihiro Shimoda66395622011-01-31 16:50:43 +09002083 CONFIG_SH_SPI
2084
2085 Enables the driver for SPI controller on SuperH. Currently
2086 only SH7757 is supported.
2087
wdenkc6097192002-11-03 00:24:07 +00002088 CONFIG_SPI_X
2089
2090 Enables extended (16-bit) SPI EEPROM addressing.
2091 (symmetrical to CONFIG_I2C_X)
2092
2093 CONFIG_SOFT_SPI
2094
wdenk43d96162003-03-06 00:02:04 +00002095 Enables a software (bit-bang) SPI driver rather than
2096 using hardware support. This is a general purpose
2097 driver that only requires three general I/O port pins
2098 (two outputs, one input) to function. If this is
2099 defined, the board configuration must define several
2100 SPI configuration items (port pins to use, etc). For
2101 an example, see include/configs/sacsng.h.
wdenkc6097192002-11-03 00:24:07 +00002102
Ben Warren04a9e112008-01-16 22:37:35 -05002103 CONFIG_HARD_SPI
2104
2105 Enables a hardware SPI driver for general-purpose reads
2106 and writes. As with CONFIG_SOFT_SPI, the board configuration
2107 must define a list of chip-select function pointers.
Wolfgang Denkc0f40852011-10-26 10:21:21 +00002108 Currently supported on some MPC8xxx processors. For an
Ben Warren04a9e112008-01-16 22:37:35 -05002109 example, see include/configs/mpc8349emds.h.
2110
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +02002111 CONFIG_MXC_SPI
2112
2113 Enables the driver for the SPI controllers on i.MX and MXC
Fabio Estevam2e3cd1c2011-10-28 08:57:46 +00002114 SoCs. Currently i.MX31/35/51 are supported.
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +02002115
Matthias Fuchs01335022007-12-27 17:12:34 +01002116- FPGA Support: CONFIG_FPGA
2117
2118 Enables FPGA subsystem.
2119
2120 CONFIG_FPGA_<vendor>
2121
2122 Enables support for specific chip vendors.
2123 (ALTERA, XILINX)
2124
2125 CONFIG_FPGA_<family>
2126
2127 Enables support for FPGA family.
2128 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
2129
2130 CONFIG_FPGA_COUNT
wdenkc6097192002-11-03 00:24:07 +00002131
wdenk43d96162003-03-06 00:02:04 +00002132 Specify the number of FPGA devices to support.
wdenkc6097192002-11-03 00:24:07 +00002133
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002134 CONFIG_SYS_FPGA_PROG_FEEDBACK
wdenkc6097192002-11-03 00:24:07 +00002135
wdenk8bde7f72003-06-27 21:31:46 +00002136 Enable printing of hash marks during FPGA configuration.
wdenkc6097192002-11-03 00:24:07 +00002137
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002138 CONFIG_SYS_FPGA_CHECK_BUSY
wdenkc6097192002-11-03 00:24:07 +00002139
wdenk43d96162003-03-06 00:02:04 +00002140 Enable checks on FPGA configuration interface busy
2141 status by the configuration function. This option
2142 will require a board or device specific function to
2143 be written.
wdenkc6097192002-11-03 00:24:07 +00002144
2145 CONFIG_FPGA_DELAY
2146
2147 If defined, a function that provides delays in the FPGA
2148 configuration driver.
2149
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002150 CONFIG_SYS_FPGA_CHECK_CTRLC
wdenkc6097192002-11-03 00:24:07 +00002151 Allow Control-C to interrupt FPGA configuration
2152
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002153 CONFIG_SYS_FPGA_CHECK_ERROR
wdenkc6097192002-11-03 00:24:07 +00002154
wdenk43d96162003-03-06 00:02:04 +00002155 Check for configuration errors during FPGA bitfile
2156 loading. For example, abort during Virtex II
2157 configuration if the INIT_B line goes low (which
2158 indicated a CRC error).
wdenkc6097192002-11-03 00:24:07 +00002159
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002160 CONFIG_SYS_FPGA_WAIT_INIT
wdenkc6097192002-11-03 00:24:07 +00002161
wdenk43d96162003-03-06 00:02:04 +00002162 Maximum time to wait for the INIT_B line to deassert
2163 after PROB_B has been deasserted during a Virtex II
2164 FPGA configuration sequence. The default time is 500
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002165 ms.
wdenkc6097192002-11-03 00:24:07 +00002166
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002167 CONFIG_SYS_FPGA_WAIT_BUSY
wdenkc6097192002-11-03 00:24:07 +00002168
wdenk43d96162003-03-06 00:02:04 +00002169 Maximum time to wait for BUSY to deassert during
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002170 Virtex II FPGA configuration. The default is 5 ms.
wdenkc6097192002-11-03 00:24:07 +00002171
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002172 CONFIG_SYS_FPGA_WAIT_CONFIG
wdenkc6097192002-11-03 00:24:07 +00002173
wdenk43d96162003-03-06 00:02:04 +00002174 Time to wait after FPGA configuration. The default is
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002175 200 ms.
wdenkc6097192002-11-03 00:24:07 +00002176
2177- Configuration Management:
2178 CONFIG_IDENT_STRING
2179
wdenk43d96162003-03-06 00:02:04 +00002180 If defined, this string will be added to the U-Boot
2181 version information (U_BOOT_VERSION)
wdenkc6097192002-11-03 00:24:07 +00002182
2183- Vendor Parameter Protection:
2184
wdenk43d96162003-03-06 00:02:04 +00002185 U-Boot considers the values of the environment
2186 variables "serial#" (Board Serial Number) and
wdenk7152b1d2003-09-05 23:19:14 +00002187 "ethaddr" (Ethernet Address) to be parameters that
wdenk43d96162003-03-06 00:02:04 +00002188 are set once by the board vendor / manufacturer, and
2189 protects these variables from casual modification by
2190 the user. Once set, these variables are read-only,
2191 and write or delete attempts are rejected. You can
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002192 change this behaviour:
wdenkc6097192002-11-03 00:24:07 +00002193
2194 If CONFIG_ENV_OVERWRITE is #defined in your config
2195 file, the write protection for vendor parameters is
wdenk47cd00f2003-03-06 13:39:27 +00002196 completely disabled. Anybody can change or delete
wdenkc6097192002-11-03 00:24:07 +00002197 these parameters.
2198
2199 Alternatively, if you #define _both_ CONFIG_ETHADDR
2200 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002201 Ethernet address is installed in the environment,
wdenkc6097192002-11-03 00:24:07 +00002202 which can be changed exactly ONCE by the user. [The
2203 serial# is unaffected by this, i. e. it remains
2204 read-only.]
2205
Joe Hershberger25980902012-12-11 22:16:31 -06002206 The same can be accomplished in a more flexible way
2207 for any variable by configuring the type of access
2208 to allow for those variables in the ".flags" variable
2209 or define CONFIG_ENV_FLAGS_LIST_STATIC.
2210
wdenkc6097192002-11-03 00:24:07 +00002211- Protected RAM:
2212 CONFIG_PRAM
2213
2214 Define this variable to enable the reservation of
2215 "protected RAM", i. e. RAM which is not overwritten
2216 by U-Boot. Define CONFIG_PRAM to hold the number of
2217 kB you want to reserve for pRAM. You can overwrite
2218 this default value by defining an environment
2219 variable "pram" to the number of kB you want to
2220 reserve. Note that the board info structure will
2221 still show the full amount of RAM. If pRAM is
2222 reserved, a new environment variable "mem" will
2223 automatically be defined to hold the amount of
2224 remaining RAM in a form that can be passed as boot
2225 argument to Linux, for instance like that:
2226
Wolfgang Denkfe126d82005-11-20 21:40:11 +01002227 setenv bootargs ... mem=\${mem}
wdenkc6097192002-11-03 00:24:07 +00002228 saveenv
2229
2230 This way you can tell Linux not to use this memory,
2231 either, which results in a memory region that will
2232 not be affected by reboots.
2233
2234 *WARNING* If your board configuration uses automatic
2235 detection of the RAM size, you must make sure that
2236 this memory test is non-destructive. So far, the
2237 following board configurations are known to be
2238 "pRAM-clean":
2239
Wolfgang Denk1b0757e2012-10-24 02:36:15 +00002240 IVMS8, IVML24, SPD8xx, TQM8xxL,
2241 HERMES, IP860, RPXlite, LWMON,
Wolfgang Denk544d97e2010-10-05 22:54:53 +02002242 FLAGADM, TQM8260
wdenkc6097192002-11-03 00:24:07 +00002243
Gabe Black40fef042012-12-02 04:55:18 +00002244- Access to physical memory region (> 4GB)
2245 Some basic support is provided for operations on memory not
2246 normally accessible to U-Boot - e.g. some architectures
2247 support access to more than 4GB of memory on 32-bit
2248 machines using physical address extension or similar.
2249 Define CONFIG_PHYSMEM to access this basic support, which
2250 currently only supports clearing the memory.
2251
wdenkc6097192002-11-03 00:24:07 +00002252- Error Recovery:
2253 CONFIG_PANIC_HANG
2254
2255 Define this variable to stop the system in case of a
2256 fatal error, so that you have to reset it manually.
2257 This is probably NOT a good idea for an embedded
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002258 system where you want the system to reboot
wdenkc6097192002-11-03 00:24:07 +00002259 automatically as fast as possible, but it may be
2260 useful during development since you can try to debug
2261 the conditions that lead to the situation.
2262
2263 CONFIG_NET_RETRY_COUNT
2264
wdenk43d96162003-03-06 00:02:04 +00002265 This variable defines the number of retries for
2266 network operations like ARP, RARP, TFTP, or BOOTP
2267 before giving up the operation. If not defined, a
2268 default value of 5 is used.
wdenkc6097192002-11-03 00:24:07 +00002269
Guennadi Liakhovetski40cb90e2008-04-03 17:04:19 +02002270 CONFIG_ARP_TIMEOUT
2271
2272 Timeout waiting for an ARP reply in milliseconds.
2273
Tetsuyuki Kobayashi48a3e992012-07-03 22:25:21 +00002274 CONFIG_NFS_TIMEOUT
2275
2276 Timeout in milliseconds used in NFS protocol.
2277 If you encounter "ERROR: Cannot umount" in nfs command,
2278 try longer timeout such as
2279 #define CONFIG_NFS_TIMEOUT 10000UL
2280
wdenkc6097192002-11-03 00:24:07 +00002281- Command Interpreter:
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02002282 CONFIG_AUTO_COMPLETE
wdenk04a85b32004-04-15 18:22:41 +00002283
2284 Enable auto completion of commands using TAB.
2285
Wolfgang Denka9398e02006-11-27 15:32:42 +01002286 Note that this feature has NOT been implemented yet
2287 for the "hush" shell.
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02002288
2289
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002290 CONFIG_SYS_HUSH_PARSER
wdenkc6097192002-11-03 00:24:07 +00002291
2292 Define this variable to enable the "hush" shell (from
2293 Busybox) as command line interpreter, thus enabling
2294 powerful command line syntax like
2295 if...then...else...fi conditionals or `&&' and '||'
2296 constructs ("shell scripts").
2297
2298 If undefined, you get the old, much simpler behaviour
2299 with a somewhat smaller memory footprint.
2300
2301
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002302 CONFIG_SYS_PROMPT_HUSH_PS2
wdenkc6097192002-11-03 00:24:07 +00002303
2304 This defines the secondary prompt string, which is
2305 printed when the command interpreter needs more input
2306 to complete a command. Usually "> ".
2307
2308 Note:
2309
wdenk8bde7f72003-06-27 21:31:46 +00002310 In the current implementation, the local variables
2311 space and global environment variables space are
2312 separated. Local variables are those you define by
2313 simply typing `name=value'. To access a local
2314 variable later on, you have write `$name' or
2315 `${name}'; to execute the contents of a variable
2316 directly type `$name' at the command prompt.
wdenkc6097192002-11-03 00:24:07 +00002317
wdenk43d96162003-03-06 00:02:04 +00002318 Global environment variables are those you use
2319 setenv/printenv to work with. To run a command stored
2320 in such a variable, you need to use the run command,
2321 and you must not use the '$' sign to access them.
wdenkc6097192002-11-03 00:24:07 +00002322
2323 To store commands and special characters in a
2324 variable, please use double quotation marks
2325 surrounding the whole text of the variable, instead
2326 of the backslashes before semicolons and special
2327 symbols.
2328
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02002329- Commandline Editing and History:
2330 CONFIG_CMDLINE_EDITING
2331
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002332 Enable editing and History functions for interactive
Wolfgang Denkb9365a22006-07-21 11:56:05 +02002333 commandline input operations
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02002334
wdenka8c7c702003-12-06 19:49:23 +00002335- Default Environment:
wdenkc6097192002-11-03 00:24:07 +00002336 CONFIG_EXTRA_ENV_SETTINGS
2337
wdenk43d96162003-03-06 00:02:04 +00002338 Define this to contain any number of null terminated
2339 strings (variable = value pairs) that will be part of
wdenk7152b1d2003-09-05 23:19:14 +00002340 the default environment compiled into the boot image.
wdenk2262cfe2002-11-18 00:14:45 +00002341
wdenk43d96162003-03-06 00:02:04 +00002342 For example, place something like this in your
2343 board's config file:
wdenkc6097192002-11-03 00:24:07 +00002344
2345 #define CONFIG_EXTRA_ENV_SETTINGS \
2346 "myvar1=value1\0" \
2347 "myvar2=value2\0"
2348
wdenk43d96162003-03-06 00:02:04 +00002349 Warning: This method is based on knowledge about the
2350 internal format how the environment is stored by the
2351 U-Boot code. This is NOT an official, exported
2352 interface! Although it is unlikely that this format
wdenk7152b1d2003-09-05 23:19:14 +00002353 will change soon, there is no guarantee either.
wdenkc6097192002-11-03 00:24:07 +00002354 You better know what you are doing here.
2355
wdenk43d96162003-03-06 00:02:04 +00002356 Note: overly (ab)use of the default environment is
2357 discouraged. Make sure to check other ways to preset
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02002358 the environment like the "source" command or the
wdenk43d96162003-03-06 00:02:04 +00002359 boot command first.
wdenkc6097192002-11-03 00:24:07 +00002360
Stephen Warren5e724ca2012-05-22 09:21:54 +00002361 CONFIG_ENV_VARS_UBOOT_CONFIG
2362
2363 Define this in order to add variables describing the
2364 U-Boot build configuration to the default environment.
2365 These will be named arch, cpu, board, vendor, and soc.
2366
2367 Enabling this option will cause the following to be defined:
2368
2369 - CONFIG_SYS_ARCH
2370 - CONFIG_SYS_CPU
2371 - CONFIG_SYS_BOARD
2372 - CONFIG_SYS_VENDOR
2373 - CONFIG_SYS_SOC
2374
Tom Rini7e27f892012-10-24 07:28:16 +00002375 CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
2376
2377 Define this in order to add variables describing certain
2378 run-time determined information about the hardware to the
2379 environment. These will be named board_name, board_rev.
2380
Simon Glass06fd8532012-11-30 13:01:17 +00002381 CONFIG_DELAY_ENVIRONMENT
2382
2383 Normally the environment is loaded when the board is
2384 intialised so that it is available to U-Boot. This inhibits
2385 that so that the environment is not available until
2386 explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
2387 this is instead controlled by the value of
2388 /config/load-environment.
2389
wdenka8c7c702003-12-06 19:49:23 +00002390- DataFlash Support:
wdenk2abbe072003-06-16 23:50:08 +00002391 CONFIG_HAS_DATAFLASH
2392
wdenk8bde7f72003-06-27 21:31:46 +00002393 Defining this option enables DataFlash features and
2394 allows to read/write in Dataflash via the standard
2395 commands cp, md...
wdenk2abbe072003-06-16 23:50:08 +00002396
Eric Nelsonf61ec452012-01-31 10:52:08 -07002397- Serial Flash support
2398 CONFIG_CMD_SF
2399
2400 Defining this option enables SPI flash commands
2401 'sf probe/read/write/erase/update'.
2402
2403 Usage requires an initial 'probe' to define the serial
2404 flash parameters, followed by read/write/erase/update
2405 commands.
2406
2407 The following defaults may be provided by the platform
2408 to handle the common case when only a single serial
2409 flash is present on the system.
2410
2411 CONFIG_SF_DEFAULT_BUS Bus identifier
2412 CONFIG_SF_DEFAULT_CS Chip-select
2413 CONFIG_SF_DEFAULT_MODE (see include/spi.h)
2414 CONFIG_SF_DEFAULT_SPEED in Hz
2415
wdenk3f85ce22004-02-23 16:11:30 +00002416- SystemACE Support:
2417 CONFIG_SYSTEMACE
2418
2419 Adding this option adds support for Xilinx SystemACE
2420 chips attached via some sort of local bus. The address
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002421 of the chip must also be defined in the
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002422 CONFIG_SYS_SYSTEMACE_BASE macro. For example:
wdenk3f85ce22004-02-23 16:11:30 +00002423
2424 #define CONFIG_SYSTEMACE
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002425 #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
wdenk3f85ce22004-02-23 16:11:30 +00002426
2427 When SystemACE support is added, the "ace" device type
2428 becomes available to the fat commands, i.e. fatls.
2429
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02002430- TFTP Fixed UDP Port:
2431 CONFIG_TFTP_PORT
2432
Wolfgang Denk28cb9372005-09-24 23:25:46 +02002433 If this is defined, the environment variable tftpsrcp
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02002434 is used to supply the TFTP UDP source port value.
Wolfgang Denk28cb9372005-09-24 23:25:46 +02002435 If tftpsrcp isn't defined, the normal pseudo-random port
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02002436 number generator is used.
2437
Wolfgang Denk28cb9372005-09-24 23:25:46 +02002438 Also, the environment variable tftpdstp is used to supply
2439 the TFTP UDP destination port value. If tftpdstp isn't
2440 defined, the normal port 69 is used.
2441
2442 The purpose for tftpsrcp is to allow a TFTP server to
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02002443 blindly start the TFTP transfer using the pre-configured
2444 target IP address and UDP port. This has the effect of
2445 "punching through" the (Windows XP) firewall, allowing
2446 the remainder of the TFTP transfer to proceed normally.
2447 A better solution is to properly configure the firewall,
2448 but sometimes that is not allowed.
2449
Simon Glassbf36c5d2012-12-05 14:46:38 +00002450- Hashing support:
2451 CONFIG_CMD_HASH
2452
2453 This enables a generic 'hash' command which can produce
2454 hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2455
2456 CONFIG_HASH_VERIFY
2457
2458 Enable the hash verify command (hash -v). This adds to code
2459 size a little.
2460
2461 CONFIG_SHA1 - support SHA1 hashing
2462 CONFIG_SHA256 - support SHA256 hashing
2463
2464 Note: There is also a sha1sum command, which should perhaps
2465 be deprecated in favour of 'hash sha1'.
2466
wdenka8c7c702003-12-06 19:49:23 +00002467- Show boot progress:
wdenkc6097192002-11-03 00:24:07 +00002468 CONFIG_SHOW_BOOT_PROGRESS
2469
wdenk43d96162003-03-06 00:02:04 +00002470 Defining this option allows to add some board-
2471 specific code (calling a user-provided function
2472 "show_boot_progress(int)") that enables you to show
2473 the system's boot progress on some display (for
2474 example, some LED's) on your board. At the moment,
2475 the following checkpoints are implemented:
wdenkc6097192002-11-03 00:24:07 +00002476
Simon Glass3a608ca2012-02-13 13:51:19 +00002477- Detailed boot stage timing
2478 CONFIG_BOOTSTAGE
2479 Define this option to get detailed timing of each stage
2480 of the boot process.
2481
2482 CONFIG_BOOTSTAGE_USER_COUNT
2483 This is the number of available user bootstage records.
2484 Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
2485 a new ID will be allocated from this stash. If you exceed
2486 the limit, recording will stop.
2487
2488 CONFIG_BOOTSTAGE_REPORT
2489 Define this to print a report before boot, similar to this:
2490
2491 Timer summary in microseconds:
2492 Mark Elapsed Stage
2493 0 0 reset
2494 3,575,678 3,575,678 board_init_f start
2495 3,575,695 17 arch_cpu_init A9
2496 3,575,777 82 arch_cpu_init done
2497 3,659,598 83,821 board_init_r start
2498 3,910,375 250,777 main_loop
2499 29,916,167 26,005,792 bootm_start
2500 30,361,327 445,160 start_kernel
2501
Simon Glass2eba38c2012-09-28 08:56:39 +00002502 CONFIG_CMD_BOOTSTAGE
2503 Add a 'bootstage' command which supports printing a report
2504 and un/stashing of bootstage data.
2505
Simon Glass94fd1312012-09-28 08:56:37 +00002506 CONFIG_BOOTSTAGE_FDT
2507 Stash the bootstage information in the FDT. A root 'bootstage'
2508 node is created with each bootstage id as a child. Each child
2509 has a 'name' property and either 'mark' containing the
2510 mark time in microsecond, or 'accum' containing the
2511 accumulated time for that bootstage id in microseconds.
2512 For example:
2513
2514 bootstage {
2515 154 {
2516 name = "board_init_f";
2517 mark = <3575678>;
2518 };
2519 170 {
2520 name = "lcd";
2521 accum = <33482>;
2522 };
2523 };
2524
2525 Code in the Linux kernel can find this in /proc/devicetree.
2526
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002527Legacy uImage format:
2528
wdenkc6097192002-11-03 00:24:07 +00002529 Arg Where When
2530 1 common/cmd_bootm.c before attempting to boot an image
wdenkba56f622004-02-06 23:19:44 +00002531 -1 common/cmd_bootm.c Image header has bad magic number
wdenkc6097192002-11-03 00:24:07 +00002532 2 common/cmd_bootm.c Image header has correct magic number
wdenkba56f622004-02-06 23:19:44 +00002533 -2 common/cmd_bootm.c Image header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00002534 3 common/cmd_bootm.c Image header has correct checksum
wdenkba56f622004-02-06 23:19:44 +00002535 -3 common/cmd_bootm.c Image data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00002536 4 common/cmd_bootm.c Image data has correct checksum
2537 -4 common/cmd_bootm.c Image is for unsupported architecture
2538 5 common/cmd_bootm.c Architecture check OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002539 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
wdenkc6097192002-11-03 00:24:07 +00002540 6 common/cmd_bootm.c Image Type check OK
2541 -6 common/cmd_bootm.c gunzip uncompression error
2542 -7 common/cmd_bootm.c Unimplemented compression type
2543 7 common/cmd_bootm.c Uncompression OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002544 8 common/cmd_bootm.c No uncompress/copy overwrite error
wdenkc6097192002-11-03 00:24:07 +00002545 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002546
2547 9 common/image.c Start initial ramdisk verification
2548 -10 common/image.c Ramdisk header has bad magic number
2549 -11 common/image.c Ramdisk header has bad checksum
2550 10 common/image.c Ramdisk header is OK
2551 -12 common/image.c Ramdisk data has bad checksum
2552 11 common/image.c Ramdisk data has correct checksum
2553 12 common/image.c Ramdisk verification complete, start loading
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002554 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002555 13 common/image.c Start multifile image verification
2556 14 common/image.c No initial ramdisk, no multifile, continue.
2557
Wolfgang Denkc0f40852011-10-26 10:21:21 +00002558 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
wdenkc6097192002-11-03 00:24:07 +00002559
Stefan Roesea47a12b2010-04-15 16:07:28 +02002560 -30 arch/powerpc/lib/board.c Fatal error, hang the system
wdenk11dadd52004-02-27 00:07:27 +00002561 -31 post/post.c POST test failed, detected by post_output_backlog()
2562 -32 post/post.c POST test failed, detected by post_run_single()
wdenk63e73c92004-02-23 22:22:28 +00002563
Heiko Schocher566a4942007-06-22 19:11:54 +02002564 34 common/cmd_doc.c before loading a Image from a DOC device
2565 -35 common/cmd_doc.c Bad usage of "doc" command
2566 35 common/cmd_doc.c correct usage of "doc" command
2567 -36 common/cmd_doc.c No boot device
2568 36 common/cmd_doc.c correct boot device
2569 -37 common/cmd_doc.c Unknown Chip ID on boot device
2570 37 common/cmd_doc.c correct chip ID found, device available
2571 -38 common/cmd_doc.c Read Error on boot device
2572 38 common/cmd_doc.c reading Image header from DOC device OK
2573 -39 common/cmd_doc.c Image header has bad magic number
2574 39 common/cmd_doc.c Image header has correct magic number
2575 -40 common/cmd_doc.c Error reading Image from DOC device
2576 40 common/cmd_doc.c Image header has correct magic number
2577 41 common/cmd_ide.c before loading a Image from a IDE device
2578 -42 common/cmd_ide.c Bad usage of "ide" command
2579 42 common/cmd_ide.c correct usage of "ide" command
2580 -43 common/cmd_ide.c No boot device
2581 43 common/cmd_ide.c boot device found
2582 -44 common/cmd_ide.c Device not available
2583 44 common/cmd_ide.c Device available
2584 -45 common/cmd_ide.c wrong partition selected
2585 45 common/cmd_ide.c partition selected
2586 -46 common/cmd_ide.c Unknown partition table
2587 46 common/cmd_ide.c valid partition table found
2588 -47 common/cmd_ide.c Invalid partition type
2589 47 common/cmd_ide.c correct partition type
2590 -48 common/cmd_ide.c Error reading Image Header on boot device
2591 48 common/cmd_ide.c reading Image Header from IDE device OK
2592 -49 common/cmd_ide.c Image header has bad magic number
2593 49 common/cmd_ide.c Image header has correct magic number
2594 -50 common/cmd_ide.c Image header has bad checksum
2595 50 common/cmd_ide.c Image header has correct checksum
2596 -51 common/cmd_ide.c Error reading Image from IDE device
2597 51 common/cmd_ide.c reading Image from IDE device OK
2598 52 common/cmd_nand.c before loading a Image from a NAND device
2599 -53 common/cmd_nand.c Bad usage of "nand" command
2600 53 common/cmd_nand.c correct usage of "nand" command
2601 -54 common/cmd_nand.c No boot device
2602 54 common/cmd_nand.c boot device found
2603 -55 common/cmd_nand.c Unknown Chip ID on boot device
2604 55 common/cmd_nand.c correct chip ID found, device available
2605 -56 common/cmd_nand.c Error reading Image Header on boot device
2606 56 common/cmd_nand.c reading Image Header from NAND device OK
2607 -57 common/cmd_nand.c Image header has bad magic number
2608 57 common/cmd_nand.c Image header has correct magic number
2609 -58 common/cmd_nand.c Error reading Image from NAND device
2610 58 common/cmd_nand.c reading Image from NAND device OK
wdenkc6097192002-11-03 00:24:07 +00002611
Heiko Schocher566a4942007-06-22 19:11:54 +02002612 -60 common/env_common.c Environment has a bad CRC, using default
wdenkc6097192002-11-03 00:24:07 +00002613
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002614 64 net/eth.c starting with Ethernet configuration.
Heiko Schocher566a4942007-06-22 19:11:54 +02002615 -64 net/eth.c no Ethernet found.
2616 65 net/eth.c Ethernet found.
wdenk206c60c2003-09-18 10:02:25 +00002617
Heiko Schocher566a4942007-06-22 19:11:54 +02002618 -80 common/cmd_net.c usage wrong
2619 80 common/cmd_net.c before calling NetLoop()
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002620 -81 common/cmd_net.c some error in NetLoop() occurred
Heiko Schocher566a4942007-06-22 19:11:54 +02002621 81 common/cmd_net.c NetLoop() back without error
2622 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
2623 82 common/cmd_net.c trying automatic boot
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02002624 83 common/cmd_net.c running "source" command
2625 -83 common/cmd_net.c some error in automatic boot or "source" command
Heiko Schocher566a4942007-06-22 19:11:54 +02002626 84 common/cmd_net.c end without errors
wdenkc6097192002-11-03 00:24:07 +00002627
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002628FIT uImage format:
2629
2630 Arg Where When
2631 100 common/cmd_bootm.c Kernel FIT Image has correct format
2632 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
2633 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
2634 -101 common/cmd_bootm.c Can't get configuration for kernel subimage
2635 102 common/cmd_bootm.c Kernel unit name specified
2636 -103 common/cmd_bootm.c Can't get kernel subimage node offset
Marian Balakowiczf773bea2008-03-12 10:35:46 +01002637 103 common/cmd_bootm.c Found configuration node
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002638 104 common/cmd_bootm.c Got kernel subimage node offset
2639 -104 common/cmd_bootm.c Kernel subimage hash verification failed
2640 105 common/cmd_bootm.c Kernel subimage hash verification OK
2641 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
2642 106 common/cmd_bootm.c Architecture check OK
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002643 -106 common/cmd_bootm.c Kernel subimage has wrong type
2644 107 common/cmd_bootm.c Kernel subimage type OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002645 -107 common/cmd_bootm.c Can't get kernel subimage data/size
2646 108 common/cmd_bootm.c Got kernel subimage data/size
2647 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
2648 -109 common/cmd_bootm.c Can't get kernel subimage type
2649 -110 common/cmd_bootm.c Can't get kernel subimage comp
2650 -111 common/cmd_bootm.c Can't get kernel subimage os
2651 -112 common/cmd_bootm.c Can't get kernel subimage load address
2652 -113 common/cmd_bootm.c Image uncompress/copy overwrite error
2653
2654 120 common/image.c Start initial ramdisk verification
2655 -120 common/image.c Ramdisk FIT image has incorrect format
2656 121 common/image.c Ramdisk FIT image has correct format
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002657 122 common/image.c No ramdisk subimage unit name, using configuration
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002658 -122 common/image.c Can't get configuration for ramdisk subimage
2659 123 common/image.c Ramdisk unit name specified
2660 -124 common/image.c Can't get ramdisk subimage node offset
2661 125 common/image.c Got ramdisk subimage node offset
2662 -125 common/image.c Ramdisk subimage hash verification failed
2663 126 common/image.c Ramdisk subimage hash verification OK
2664 -126 common/image.c Ramdisk subimage for unsupported architecture
2665 127 common/image.c Architecture check OK
2666 -127 common/image.c Can't get ramdisk subimage data/size
2667 128 common/image.c Got ramdisk subimage data/size
2668 129 common/image.c Can't get ramdisk load address
2669 -129 common/image.c Got ramdisk load address
2670
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002671 -130 common/cmd_doc.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002672 131 common/cmd_doc.c FIT image format OK
2673
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002674 -140 common/cmd_ide.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002675 141 common/cmd_ide.c FIT image format OK
2676
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002677 -150 common/cmd_nand.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002678 151 common/cmd_nand.c FIT image format OK
2679
Gabe Blackd95f6ec2012-10-25 16:31:10 +00002680- FIT image support:
2681 CONFIG_FIT
2682 Enable support for the FIT uImage format.
2683
2684 CONFIG_FIT_BEST_MATCH
2685 When no configuration is explicitly selected, default to the
2686 one whose fdt's compatibility field best matches that of
2687 U-Boot itself. A match is considered "best" if it matches the
2688 most specific compatibility entry of U-Boot's fdt's root node.
2689 The order of entries in the configuration's fdt is ignored.
2690
Wolfgang Denk4cf26092011-10-07 09:58:21 +02002691- Standalone program support:
2692 CONFIG_STANDALONE_LOAD_ADDR
2693
Wolfgang Denk6feff892011-10-09 21:06:34 +02002694 This option defines a board specific value for the
2695 address where standalone program gets loaded, thus
2696 overwriting the architecture dependent default
Wolfgang Denk4cf26092011-10-07 09:58:21 +02002697 settings.
2698
2699- Frame Buffer Address:
2700 CONFIG_FB_ADDR
2701
2702 Define CONFIG_FB_ADDR if you want to use specific
2703 address for frame buffer.
2704 Then system will reserve the frame buffer address to
2705 defined address instead of lcd_setmem (this function
Wolfgang Denk6feff892011-10-09 21:06:34 +02002706 grabs the memory for frame buffer by panel's size).
Wolfgang Denk4cf26092011-10-07 09:58:21 +02002707
2708 Please see board_init_f function.
2709
Detlev Zundelcccfc2a2009-12-01 17:16:19 +01002710- Automatic software updates via TFTP server
2711 CONFIG_UPDATE_TFTP
2712 CONFIG_UPDATE_TFTP_CNT_MAX
2713 CONFIG_UPDATE_TFTP_MSEC_MAX
2714
2715 These options enable and control the auto-update feature;
2716 for a more detailed description refer to doc/README.update.
2717
2718- MTD Support (mtdparts command, UBI support)
2719 CONFIG_MTD_DEVICE
2720
2721 Adds the MTD device infrastructure from the Linux kernel.
2722 Needed for mtdparts command support.
2723
2724 CONFIG_MTD_PARTITIONS
2725
2726 Adds the MTD partitioning infrastructure from the Linux
2727 kernel. Needed for UBI support.
2728
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002729- SPL framework
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002730 CONFIG_SPL
2731 Enable building of SPL globally.
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002732
Tom Rini95579792012-02-14 07:29:40 +00002733 CONFIG_SPL_LDSCRIPT
2734 LDSCRIPT for linking the SPL binary.
2735
2736 CONFIG_SPL_MAX_SIZE
2737 Maximum binary size (text, data and rodata) of the SPL binary.
2738
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002739 CONFIG_SPL_TEXT_BASE
2740 TEXT_BASE for linking the SPL binary.
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002741
Scott Wood94a45bb2012-09-20 19:05:12 -05002742 CONFIG_SPL_RELOC_TEXT_BASE
2743 Address to relocate to. If unspecified, this is equal to
2744 CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
2745
Tom Rini95579792012-02-14 07:29:40 +00002746 CONFIG_SPL_BSS_START_ADDR
2747 Link address for the BSS within the SPL binary.
2748
2749 CONFIG_SPL_BSS_MAX_SIZE
2750 Maximum binary size of the BSS section of the SPL binary.
2751
2752 CONFIG_SPL_STACK
2753 Adress of the start of the stack SPL will use
2754
Scott Wood94a45bb2012-09-20 19:05:12 -05002755 CONFIG_SPL_RELOC_STACK
2756 Adress of the start of the stack SPL will use after
2757 relocation. If unspecified, this is equal to
2758 CONFIG_SPL_STACK.
2759
Tom Rini95579792012-02-14 07:29:40 +00002760 CONFIG_SYS_SPL_MALLOC_START
2761 Starting address of the malloc pool used in SPL.
2762
2763 CONFIG_SYS_SPL_MALLOC_SIZE
2764 The size of the malloc pool used in SPL.
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002765
Tom Rini47f7bca2012-08-13 12:03:19 -07002766 CONFIG_SPL_FRAMEWORK
2767 Enable the SPL framework under common/. This framework
2768 supports MMC, NAND and YMODEM loading of U-Boot and NAND
2769 NAND loading of the Linux Kernel.
2770
Tom Rini861a86f2012-08-13 11:37:56 -07002771 CONFIG_SPL_DISPLAY_PRINT
2772 For ARM, enable an optional function to print more information
2773 about the running system.
2774
Scott Wood4b919722012-09-20 16:35:21 -05002775 CONFIG_SPL_INIT_MINIMAL
2776 Arch init code should be built for a very small image
2777
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002778 CONFIG_SPL_LIBCOMMON_SUPPORT
2779 Support for common/libcommon.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002780
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002781 CONFIG_SPL_LIBDISK_SUPPORT
2782 Support for disk/libdisk.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002783
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002784 CONFIG_SPL_I2C_SUPPORT
2785 Support for drivers/i2c/libi2c.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002786
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002787 CONFIG_SPL_GPIO_SUPPORT
2788 Support for drivers/gpio/libgpio.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002789
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002790 CONFIG_SPL_MMC_SUPPORT
2791 Support for drivers/mmc/libmmc.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002792
Tom Rini95579792012-02-14 07:29:40 +00002793 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
2794 CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
2795 CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
2796 Address, size and partition on the MMC to load U-Boot from
2797 when the MMC is being used in raw mode.
2798
2799 CONFIG_SPL_FAT_SUPPORT
2800 Support for fs/fat/libfat.o in SPL binary
2801
2802 CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
2803 Filename to read to load U-Boot when reading from FAT
2804
Scott Wood6f2f01b2012-09-20 19:09:07 -05002805 CONFIG_SPL_NAND_BASE
2806 Include nand_base.c in the SPL. Requires
2807 CONFIG_SPL_NAND_DRIVERS.
2808
2809 CONFIG_SPL_NAND_DRIVERS
2810 SPL uses normal NAND drivers, not minimal drivers.
2811
2812 CONFIG_SPL_NAND_ECC
2813 Include standard software ECC in the SPL
2814
Tom Rini95579792012-02-14 07:29:40 +00002815 CONFIG_SPL_NAND_SIMPLE
Scott Wood7d4b7952012-09-21 18:35:27 -05002816 Support for NAND boot using simple NAND drivers that
2817 expose the cmd_ctrl() interface.
Tom Rini95579792012-02-14 07:29:40 +00002818
2819 CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
2820 CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
2821 CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
2822 CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
2823 CONFIG_SYS_NAND_ECCBYTES
2824 Defines the size and behavior of the NAND that SPL uses
Scott Wood7d4b7952012-09-21 18:35:27 -05002825 to read U-Boot
Tom Rini95579792012-02-14 07:29:40 +00002826
2827 CONFIG_SYS_NAND_U_BOOT_OFFS
Scott Wood7d4b7952012-09-21 18:35:27 -05002828 Location in NAND to read U-Boot from
2829
2830 CONFIG_SYS_NAND_U_BOOT_DST
2831 Location in memory to load U-Boot to
2832
2833 CONFIG_SYS_NAND_U_BOOT_SIZE
2834 Size of image to load
Tom Rini95579792012-02-14 07:29:40 +00002835
2836 CONFIG_SYS_NAND_U_BOOT_START
Scott Wood7d4b7952012-09-21 18:35:27 -05002837 Entry point in loaded image to jump to
Tom Rini95579792012-02-14 07:29:40 +00002838
2839 CONFIG_SYS_NAND_HW_ECC_OOBFIRST
2840 Define this if you need to first read the OOB and then the
2841 data. This is used for example on davinci plattforms.
2842
2843 CONFIG_SPL_OMAP3_ID_NAND
2844 Support for an OMAP3-specific set of functions to return the
2845 ID and MFR of the first attached NAND chip, if present.
2846
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002847 CONFIG_SPL_SERIAL_SUPPORT
2848 Support for drivers/serial/libserial.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002849
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002850 CONFIG_SPL_SPI_FLASH_SUPPORT
2851 Support for drivers/mtd/spi/libspi_flash.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002852
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002853 CONFIG_SPL_SPI_SUPPORT
2854 Support for drivers/spi/libspi.o in SPL binary
Daniel Schwierzeck6a11cf42011-07-18 07:48:07 +00002855
Pavel Machekc57b9532012-08-30 22:42:11 +02002856 CONFIG_SPL_RAM_DEVICE
2857 Support for running image already present in ram, in SPL binary
2858
Wolfgang Denk04e5ae72011-09-11 21:24:09 +02002859 CONFIG_SPL_LIBGENERIC_SUPPORT
2860 Support for lib/libgeneric.o in SPL binary
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002861
Scott Woodca2fca22012-09-21 16:27:32 -05002862 CONFIG_SPL_TARGET
2863 Final target image containing SPL and payload. Some SPLs
2864 use an arch-specific makefile fragment instead, for
2865 example if more than one image needs to be produced.
2866
wdenkc6097192002-11-03 00:24:07 +00002867Modem Support:
2868--------------
2869
Wolfgang Denk566e5cf2011-05-01 20:44:23 +02002870[so far only for SMDK2400 boards]
wdenkc6097192002-11-03 00:24:07 +00002871
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002872- Modem support enable:
wdenkc6097192002-11-03 00:24:07 +00002873 CONFIG_MODEM_SUPPORT
2874
2875- RTS/CTS Flow control enable:
2876 CONFIG_HWFLOW
2877
2878- Modem debug support:
2879 CONFIG_MODEM_SUPPORT_DEBUG
2880
wdenk43d96162003-03-06 00:02:04 +00002881 Enables debugging stuff (char screen[1024], dbg())
2882 for modem support. Useful only with BDI2000.
wdenkc6097192002-11-03 00:24:07 +00002883
wdenka8c7c702003-12-06 19:49:23 +00002884- Interrupt support (PPC):
2885
wdenkd4ca31c2004-01-02 14:00:00 +00002886 There are common interrupt_init() and timer_interrupt()
2887 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002888 for CPU specific initialization. interrupt_init_cpu()
wdenkd4ca31c2004-01-02 14:00:00 +00002889 should set decrementer_count to appropriate value. If
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002890 CPU resets decrementer automatically after interrupt
wdenkd4ca31c2004-01-02 14:00:00 +00002891 (ppc4xx) it should set decrementer_count to zero.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002892 timer_interrupt() calls timer_interrupt_cpu() for CPU
wdenkd4ca31c2004-01-02 14:00:00 +00002893 specific handling. If board has watchdog / status_led
2894 / other_activity_monitor it works automatically from
2895 general timer_interrupt().
wdenka8c7c702003-12-06 19:49:23 +00002896
wdenkc6097192002-11-03 00:24:07 +00002897- General:
2898
wdenk43d96162003-03-06 00:02:04 +00002899 In the target system modem support is enabled when a
2900 specific key (key combination) is pressed during
2901 power-on. Otherwise U-Boot will boot normally
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002902 (autoboot). The key_pressed() function is called from
wdenk43d96162003-03-06 00:02:04 +00002903 board_init(). Currently key_pressed() is a dummy
2904 function, returning 1 and thus enabling modem
2905 initialization.
wdenkc6097192002-11-03 00:24:07 +00002906
wdenk43d96162003-03-06 00:02:04 +00002907 If there are no modem init strings in the
2908 environment, U-Boot proceed to autoboot; the
2909 previous output (banner, info printfs) will be
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002910 suppressed, though.
wdenkc6097192002-11-03 00:24:07 +00002911
2912 See also: doc/README.Modem
2913
Helmut Raiger9660e442011-10-20 04:19:47 +00002914Board initialization settings:
2915------------------------------
2916
2917During Initialization u-boot calls a number of board specific functions
2918to allow the preparation of board specific prerequisites, e.g. pin setup
2919before drivers are initialized. To enable these callbacks the
2920following configuration macros have to be defined. Currently this is
2921architecture specific, so please check arch/your_architecture/lib/board.c
2922typically in board_init_f() and board_init_r().
2923
2924- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
2925- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
2926- CONFIG_BOARD_LATE_INIT: Call board_late_init()
2927- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
wdenkc6097192002-11-03 00:24:07 +00002928
wdenkc6097192002-11-03 00:24:07 +00002929Configuration Settings:
2930-----------------------
2931
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002932- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
wdenkc6097192002-11-03 00:24:07 +00002933 undefine this when you're short of memory.
2934
Peter Tyser2fb26042009-01-27 18:03:12 -06002935- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
2936 width of the commands listed in the 'help' command output.
2937
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002938- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
wdenkc6097192002-11-03 00:24:07 +00002939 prompt for user input.
2940
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002941- CONFIG_SYS_CBSIZE: Buffer size for input from the Console
wdenkc6097192002-11-03 00:24:07 +00002942
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002943- CONFIG_SYS_PBSIZE: Buffer size for Console output
wdenkc6097192002-11-03 00:24:07 +00002944
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002945- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
wdenkc6097192002-11-03 00:24:07 +00002946
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002947- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
wdenkc6097192002-11-03 00:24:07 +00002948 the application (usually a Linux kernel) when it is
2949 booted
2950
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002951- CONFIG_SYS_BAUDRATE_TABLE:
wdenkc6097192002-11-03 00:24:07 +00002952 List of legal baudrate settings for this board.
2953
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002954- CONFIG_SYS_CONSOLE_INFO_QUIET
wdenk8bde7f72003-06-27 21:31:46 +00002955 Suppress display of console information at boot.
wdenkc6097192002-11-03 00:24:07 +00002956
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002957- CONFIG_SYS_CONSOLE_IS_IN_ENV
wdenk8bde7f72003-06-27 21:31:46 +00002958 If the board specific function
2959 extern int overwrite_console (void);
2960 returns 1, the stdin, stderr and stdout are switched to the
wdenkc6097192002-11-03 00:24:07 +00002961 serial port, else the settings in the environment are used.
2962
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002963- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
wdenk8bde7f72003-06-27 21:31:46 +00002964 Enable the call to overwrite_console().
wdenkc6097192002-11-03 00:24:07 +00002965
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002966- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
wdenkc6097192002-11-03 00:24:07 +00002967 Enable overwrite of previous console environment settings.
2968
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002969- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
wdenkc6097192002-11-03 00:24:07 +00002970 Begin and End addresses of the area used by the
2971 simple memory test.
2972
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002973- CONFIG_SYS_ALT_MEMTEST:
wdenk8bde7f72003-06-27 21:31:46 +00002974 Enable an alternate, more extensive memory test.
wdenkc6097192002-11-03 00:24:07 +00002975
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002976- CONFIG_SYS_MEMTEST_SCRATCH:
wdenk5f535fe2003-09-18 09:21:33 +00002977 Scratch address used by the alternate memory test
2978 You only need to set this if address zero isn't writeable
2979
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002980- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
2981 If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
Stefan Roese14f73ca2008-03-26 10:14:11 +01002982 this specified memory area will get subtracted from the top
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002983 (end) of RAM and won't get "touched" at all by U-Boot. By
Stefan Roese14f73ca2008-03-26 10:14:11 +01002984 fixing up gd->ram_size the Linux kernel should gets passed
2985 the now "corrected" memory size and won't touch it either.
2986 This should work for arch/ppc and arch/powerpc. Only Linux
Stefan Roese5e12e752008-03-28 11:02:53 +01002987 board ports in arch/powerpc with bootwrapper support that
Stefan Roese14f73ca2008-03-26 10:14:11 +01002988 recalculate the memory size from the SDRAM controller setup
Stefan Roese5e12e752008-03-28 11:02:53 +01002989 will have to get fixed in Linux additionally.
Stefan Roese14f73ca2008-03-26 10:14:11 +01002990
2991 This option can be used as a workaround for the 440EPx/GRx
2992 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
2993 be touched.
2994
2995 WARNING: Please make sure that this value is a multiple of
2996 the Linux page size (normally 4k). If this is not the case,
2997 then the end address of the Linux memory will be located at a
2998 non page size aligned address and this could cause major
2999 problems.
3000
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003001- CONFIG_SYS_LOADS_BAUD_CHANGE:
wdenkc6097192002-11-03 00:24:07 +00003002 Enable temporary baudrate change while serial download
3003
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003004- CONFIG_SYS_SDRAM_BASE:
wdenkc6097192002-11-03 00:24:07 +00003005 Physical start address of SDRAM. _Must_ be 0 here.
3006
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003007- CONFIG_SYS_MBIO_BASE:
wdenkc6097192002-11-03 00:24:07 +00003008 Physical start address of Motherboard I/O (if using a
3009 Cogent motherboard)
3010
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003011- CONFIG_SYS_FLASH_BASE:
wdenkc6097192002-11-03 00:24:07 +00003012 Physical start address of Flash memory.
3013
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003014- CONFIG_SYS_MONITOR_BASE:
wdenkc6097192002-11-03 00:24:07 +00003015 Physical start address of boot monitor code (set by
3016 make config files to be same as the text base address
Wolfgang Denk14d0a022010-10-07 21:51:12 +02003017 (CONFIG_SYS_TEXT_BASE) used when linking) - same as
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003018 CONFIG_SYS_FLASH_BASE when booting from flash.
wdenkc6097192002-11-03 00:24:07 +00003019
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003020- CONFIG_SYS_MONITOR_LEN:
wdenk8bde7f72003-06-27 21:31:46 +00003021 Size of memory reserved for monitor code, used to
3022 determine _at_compile_time_ (!) if the environment is
3023 embedded within the U-Boot image, or in a separate
3024 flash sector.
wdenkc6097192002-11-03 00:24:07 +00003025
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003026- CONFIG_SYS_MALLOC_LEN:
wdenkc6097192002-11-03 00:24:07 +00003027 Size of DRAM reserved for malloc() use.
3028
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003029- CONFIG_SYS_BOOTM_LEN:
Stefan Roese15940c92006-03-13 11:16:36 +01003030 Normally compressed uImages are limited to an
3031 uncompressed size of 8 MBytes. If this is not enough,
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003032 you can define CONFIG_SYS_BOOTM_LEN in your board config file
Stefan Roese15940c92006-03-13 11:16:36 +01003033 to adjust this setting to your needs.
3034
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003035- CONFIG_SYS_BOOTMAPSZ:
wdenkc6097192002-11-03 00:24:07 +00003036 Maximum size of memory mapped by the startup code of
3037 the Linux kernel; all data that must be processed by
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02003038 the Linux kernel (bd_info, boot arguments, FDT blob if
3039 used) must be put below this limit, unless "bootm_low"
3040 enviroment variable is defined and non-zero. In such case
3041 all data for the Linux kernel must be between "bootm_low"
Wolfgang Denkc0f40852011-10-26 10:21:21 +00003042 and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
Grant Likelyc3624e62011-03-28 09:58:43 +00003043 variable "bootm_mapsize" will override the value of
3044 CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
3045 then the value in "bootm_size" will be used instead.
wdenkc6097192002-11-03 00:24:07 +00003046
John Rigbyfca43cc2010-10-13 13:57:35 -06003047- CONFIG_SYS_BOOT_RAMDISK_HIGH:
3048 Enable initrd_high functionality. If defined then the
3049 initrd_high feature is enabled and the bootm ramdisk subcommand
3050 is enabled.
3051
3052- CONFIG_SYS_BOOT_GET_CMDLINE:
3053 Enables allocating and saving kernel cmdline in space between
3054 "bootm_low" and "bootm_low" + BOOTMAPSZ.
3055
3056- CONFIG_SYS_BOOT_GET_KBD:
3057 Enables allocating and saving a kernel copy of the bd_info in
3058 space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3059
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003060- CONFIG_SYS_MAX_FLASH_BANKS:
wdenkc6097192002-11-03 00:24:07 +00003061 Max number of Flash memory banks
3062
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003063- CONFIG_SYS_MAX_FLASH_SECT:
wdenkc6097192002-11-03 00:24:07 +00003064 Max number of sectors on a Flash chip
3065
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003066- CONFIG_SYS_FLASH_ERASE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00003067 Timeout for Flash erase operations (in ms)
3068
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003069- CONFIG_SYS_FLASH_WRITE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00003070 Timeout for Flash write operations (in ms)
3071
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003072- CONFIG_SYS_FLASH_LOCK_TOUT
wdenk8564acf2003-07-14 22:13:32 +00003073 Timeout for Flash set sector lock bit operation (in ms)
3074
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003075- CONFIG_SYS_FLASH_UNLOCK_TOUT
wdenk8564acf2003-07-14 22:13:32 +00003076 Timeout for Flash clear lock bits operation (in ms)
3077
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003078- CONFIG_SYS_FLASH_PROTECTION
wdenk8564acf2003-07-14 22:13:32 +00003079 If defined, hardware flash sectors protection is used
3080 instead of U-Boot software protection.
3081
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003082- CONFIG_SYS_DIRECT_FLASH_TFTP:
wdenkc6097192002-11-03 00:24:07 +00003083
3084 Enable TFTP transfers directly to flash memory;
3085 without this option such a download has to be
3086 performed in two steps: (1) download to RAM, and (2)
3087 copy from RAM to flash.
3088
3089 The two-step approach is usually more reliable, since
3090 you can check if the download worked before you erase
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003091 the flash, but in some situations (when system RAM is
3092 too limited to allow for a temporary copy of the
wdenkc6097192002-11-03 00:24:07 +00003093 downloaded image) this option may be very useful.
3094
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003095- CONFIG_SYS_FLASH_CFI:
wdenk43d96162003-03-06 00:02:04 +00003096 Define if the flash driver uses extra elements in the
wdenk5653fc32004-02-08 22:55:38 +00003097 common flash structure for storing flash geometry.
3098
Jean-Christophe PLAGNIOL-VILLARD00b18832008-08-13 01:40:42 +02003099- CONFIG_FLASH_CFI_DRIVER
wdenk5653fc32004-02-08 22:55:38 +00003100 This option also enables the building of the cfi_flash driver
3101 in the drivers directory
wdenkc6097192002-11-03 00:24:07 +00003102
Piotr Ziecik91809ed2008-11-17 15:57:58 +01003103- CONFIG_FLASH_CFI_MTD
3104 This option enables the building of the cfi_mtd driver
3105 in the drivers directory. The driver exports CFI flash
3106 to the MTD layer.
3107
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003108- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
Guennadi Liakhovetski96ef8312008-04-03 13:36:02 +02003109 Use buffered writes to flash.
3110
3111- CONFIG_FLASH_SPANSION_S29WS_N
3112 s29ws-n MirrorBit flash has non-standard addresses for buffered
3113 write commands.
3114
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003115- CONFIG_SYS_FLASH_QUIET_TEST
Stefan Roese5568e612005-11-22 13:20:42 +01003116 If this option is defined, the common CFI flash doesn't
3117 print it's warning upon not recognized FLASH banks. This
3118 is useful, if some of the configured banks are only
3119 optionally available.
3120
Jerry Van Baren9a042e92008-03-08 13:48:01 -05003121- CONFIG_FLASH_SHOW_PROGRESS
3122 If defined (must be an integer), print out countdown
3123 digits and dots. Recommended value: 45 (9..1) for 80
3124 column displays, 15 (3..1) for 40 column displays.
3125
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003126- CONFIG_SYS_RX_ETH_BUFFER:
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003127 Defines the number of Ethernet receive buffers. On some
3128 Ethernet controllers it is recommended to set this value
stroese53cf9432003-06-05 15:39:44 +00003129 to 8 or even higher (EEPRO100 or 405 EMAC), since all
3130 buffers can be full shortly after enabling the interface
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003131 on high Ethernet traffic.
stroese53cf9432003-06-05 15:39:44 +00003132 Defaults to 4 if not defined.
3133
Wolfgang Denkea882ba2010-06-20 23:33:59 +02003134- CONFIG_ENV_MAX_ENTRIES
3135
Wolfgang Denk071bc922010-10-27 22:48:30 +02003136 Maximum number of entries in the hash table that is used
3137 internally to store the environment settings. The default
3138 setting is supposed to be generous and should work in most
3139 cases. This setting can be used to tune behaviour; see
3140 lib/hashtable.c for details.
Wolfgang Denkea882ba2010-06-20 23:33:59 +02003141
Joe Hershberger25980902012-12-11 22:16:31 -06003142- CONFIG_ENV_FLAGS_LIST_DEFAULT
3143- CONFIG_ENV_FLAGS_LIST_STATIC
3144 Enable validation of the values given to enviroment variables when
3145 calling env set. Variables can be restricted to only decimal,
3146 hexadecimal, or boolean. If CONFIG_CMD_NET is also defined,
3147 the variables can also be restricted to IP address or MAC address.
3148
3149 The format of the list is:
3150 type_attribute = [s|d|x|b|i|m]
Joe Hershberger267541f2012-12-11 22:16:34 -06003151 access_atribute = [a|r|o|c]
3152 attributes = type_attribute[access_atribute]
Joe Hershberger25980902012-12-11 22:16:31 -06003153 entry = variable_name[:attributes]
3154 list = entry[,list]
3155
3156 The type attributes are:
3157 s - String (default)
3158 d - Decimal
3159 x - Hexadecimal
3160 b - Boolean ([1yYtT|0nNfF])
3161 i - IP address
3162 m - MAC address
3163
Joe Hershberger267541f2012-12-11 22:16:34 -06003164 The access attributes are:
3165 a - Any (default)
3166 r - Read-only
3167 o - Write-once
3168 c - Change-default
3169
Joe Hershberger25980902012-12-11 22:16:31 -06003170 - CONFIG_ENV_FLAGS_LIST_DEFAULT
3171 Define this to a list (string) to define the ".flags"
3172 envirnoment variable in the default or embedded environment.
3173
3174 - CONFIG_ENV_FLAGS_LIST_STATIC
3175 Define this to a list (string) to define validation that
3176 should be done if an entry is not found in the ".flags"
3177 environment variable. To override a setting in the static
3178 list, simply add an entry for the same variable name to the
3179 ".flags" variable.
3180
Joe Hershberger267541f2012-12-11 22:16:34 -06003181- CONFIG_ENV_ACCESS_IGNORE_FORCE
3182 If defined, don't allow the -f switch to env set override variable
3183 access flags.
3184
wdenkc6097192002-11-03 00:24:07 +00003185The following definitions that deal with the placement and management
3186of environment data (variable area); in general, we support the
3187following configurations:
3188
Mike Frysingerc3eb3fe2011-07-08 10:44:25 +00003189- CONFIG_BUILD_ENVCRC:
3190
3191 Builds up envcrc with the target environment so that external utils
3192 may easily extract it and embed it in final U-Boot images.
3193
Jean-Christophe PLAGNIOL-VILLARD5a1aceb2008-09-10 22:48:04 +02003194- CONFIG_ENV_IS_IN_FLASH:
wdenkc6097192002-11-03 00:24:07 +00003195
3196 Define this if the environment is in flash memory.
3197
3198 a) The environment occupies one whole flash sector, which is
3199 "embedded" in the text segment with the U-Boot code. This
3200 happens usually with "bottom boot sector" or "top boot
3201 sector" type flash chips, which have several smaller
3202 sectors at the start or the end. For instance, such a
3203 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3204 such a case you would place the environment in one of the
3205 4 kB sectors - with U-Boot code before and after it. With
3206 "top boot sector" type flash chips, you would put the
3207 environment in one of the last sectors, leaving a gap
3208 between U-Boot and the environment.
3209
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003210 - CONFIG_ENV_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00003211
3212 Offset of environment data (variable area) to the
3213 beginning of flash memory; for instance, with bottom boot
3214 type flash chips the second sector can be used: the offset
3215 for this sector is given here.
3216
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003217 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
wdenkc6097192002-11-03 00:24:07 +00003218
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003219 - CONFIG_ENV_ADDR:
wdenkc6097192002-11-03 00:24:07 +00003220
3221 This is just another way to specify the start address of
3222 the flash sector containing the environment (instead of
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003223 CONFIG_ENV_OFFSET).
wdenkc6097192002-11-03 00:24:07 +00003224
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003225 - CONFIG_ENV_SECT_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003226
3227 Size of the sector containing the environment.
3228
3229
3230 b) Sometimes flash chips have few, equal sized, BIG sectors.
3231 In such a case you don't want to spend a whole sector for
3232 the environment.
3233
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003234 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003235
Jean-Christophe PLAGNIOL-VILLARD5a1aceb2008-09-10 22:48:04 +02003236 If you use this in combination with CONFIG_ENV_IS_IN_FLASH
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003237 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
wdenkc6097192002-11-03 00:24:07 +00003238 of this flash sector for the environment. This saves
3239 memory for the RAM copy of the environment.
3240
3241 It may also save flash memory if you decide to use this
3242 when your environment is "embedded" within U-Boot code,
3243 since then the remainder of the flash sector could be used
3244 for U-Boot code. It should be pointed out that this is
3245 STRONGLY DISCOURAGED from a robustness point of view:
3246 updating the environment in flash makes it always
3247 necessary to erase the WHOLE sector. If something goes
3248 wrong before the contents has been restored from a copy in
3249 RAM, your target system will be dead.
3250
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003251 - CONFIG_ENV_ADDR_REDUND
3252 CONFIG_ENV_SIZE_REDUND
wdenkc6097192002-11-03 00:24:07 +00003253
wdenk43d96162003-03-06 00:02:04 +00003254 These settings describe a second storage area used to hold
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003255 a redundant copy of the environment data, so that there is
wdenk3e386912003-04-05 00:53:31 +00003256 a valid backup copy in case there is a power failure during
wdenk43d96162003-03-06 00:02:04 +00003257 a "saveenv" operation.
wdenkc6097192002-11-03 00:24:07 +00003258
3259BE CAREFUL! Any changes to the flash layout, and some changes to the
3260source code will make it necessary to adapt <board>/u-boot.lds*
3261accordingly!
3262
3263
Jean-Christophe PLAGNIOL-VILLARD9314cee2008-09-10 22:47:59 +02003264- CONFIG_ENV_IS_IN_NVRAM:
wdenkc6097192002-11-03 00:24:07 +00003265
3266 Define this if you have some non-volatile memory device
3267 (NVRAM, battery buffered SRAM) which you want to use for the
3268 environment.
3269
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003270 - CONFIG_ENV_ADDR:
3271 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003272
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003273 These two #defines are used to determine the memory area you
wdenkc6097192002-11-03 00:24:07 +00003274 want to use for environment. It is assumed that this memory
3275 can just be read and written to, without any special
3276 provision.
3277
3278BE CAREFUL! The first access to the environment happens quite early
3279in U-Boot initalization (when we try to get the setting of for the
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003280console baudrate). You *MUST* have mapped your NVRAM area then, or
wdenkc6097192002-11-03 00:24:07 +00003281U-Boot will hang.
3282
3283Please note that even with NVRAM we still use a copy of the
3284environment in RAM: we could work on NVRAM directly, but we want to
3285keep settings there always unmodified except somebody uses "saveenv"
3286to save the current settings.
3287
3288
Jean-Christophe PLAGNIOL-VILLARDbb1f8b42008-09-05 09:19:30 +02003289- CONFIG_ENV_IS_IN_EEPROM:
wdenkc6097192002-11-03 00:24:07 +00003290
3291 Use this if you have an EEPROM or similar serial access
3292 device and a driver for it.
3293
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003294 - CONFIG_ENV_OFFSET:
3295 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003296
3297 These two #defines specify the offset and size of the
3298 environment area within the total memory of your EEPROM.
3299
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003300 - CONFIG_SYS_I2C_EEPROM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00003301 If defined, specified the chip address of the EEPROM device.
3302 The default address is zero.
3303
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003304 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
wdenkc6097192002-11-03 00:24:07 +00003305 If defined, the number of bits used to address bytes in a
3306 single page in the EEPROM device. A 64 byte page, for example
3307 would require six bits.
3308
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003309 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
wdenkc6097192002-11-03 00:24:07 +00003310 If defined, the number of milliseconds to delay between
wdenkba56f622004-02-06 23:19:44 +00003311 page writes. The default is zero milliseconds.
wdenkc6097192002-11-03 00:24:07 +00003312
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003313 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
wdenkc6097192002-11-03 00:24:07 +00003314 The length in bytes of the EEPROM memory array address. Note
3315 that this is NOT the chip address length!
3316
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003317 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
wdenk5cf91d62004-04-23 20:32:05 +00003318 EEPROM chips that implement "address overflow" are ones
3319 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
3320 address and the extra bits end up in the "chip address" bit
3321 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
3322 byte chips.
3323
3324 Note that we consider the length of the address field to
3325 still be one byte because the extra address bits are hidden
3326 in the chip address.
3327
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003328 - CONFIG_SYS_EEPROM_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003329 The size in bytes of the EEPROM device.
3330
Heiko Schocher548738b2010-01-07 08:55:40 +01003331 - CONFIG_ENV_EEPROM_IS_ON_I2C
3332 define this, if you have I2C and SPI activated, and your
3333 EEPROM, which holds the environment, is on the I2C bus.
3334
3335 - CONFIG_I2C_ENV_EEPROM_BUS
3336 if you have an Environment on an EEPROM reached over
3337 I2C muxes, you can define here, how to reach this
3338 EEPROM. For example:
3339
Wolfgang Denka9046b92010-06-13 17:48:15 +02003340 #define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0"
Heiko Schocher548738b2010-01-07 08:55:40 +01003341
3342 EEPROM which holds the environment, is reached over
3343 a pca9547 i2c mux with address 0x70, channel 3.
wdenkc6097192002-11-03 00:24:07 +00003344
Jean-Christophe PLAGNIOL-VILLARD057c8492008-09-10 22:47:58 +02003345- CONFIG_ENV_IS_IN_DATAFLASH:
wdenk5779d8d2003-12-06 23:55:10 +00003346
wdenkd4ca31c2004-01-02 14:00:00 +00003347 Define this if you have a DataFlash memory device which you
wdenk5779d8d2003-12-06 23:55:10 +00003348 want to use for the environment.
3349
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003350 - CONFIG_ENV_OFFSET:
3351 - CONFIG_ENV_ADDR:
3352 - CONFIG_ENV_SIZE:
wdenk5779d8d2003-12-06 23:55:10 +00003353
3354 These three #defines specify the offset and size of the
3355 environment area within the total memory of your DataFlash placed
3356 at the specified address.
3357
Liu Gang0a85a9e2012-03-08 00:33:20 +00003358- CONFIG_ENV_IS_IN_REMOTE:
3359
3360 Define this if you have a remote memory space which you
3361 want to use for the local device's environment.
3362
3363 - CONFIG_ENV_ADDR:
3364 - CONFIG_ENV_SIZE:
3365
3366 These two #defines specify the address and size of the
3367 environment area within the remote memory space. The
3368 local device can get the environment from remote memory
Liu Gangfc54c7f2012-08-09 05:10:01 +00003369 space by SRIO or PCIE links.
Liu Gang0a85a9e2012-03-08 00:33:20 +00003370
3371BE CAREFUL! For some special cases, the local device can not use
3372"saveenv" command. For example, the local device will get the
Liu Gangfc54c7f2012-08-09 05:10:01 +00003373environment stored in a remote NOR flash by SRIO or PCIE link,
3374but it can not erase, write this NOR flash by SRIO or PCIE interface.
Liu Gang0a85a9e2012-03-08 00:33:20 +00003375
Jean-Christophe PLAGNIOL-VILLARD51bfee12008-09-10 22:47:58 +02003376- CONFIG_ENV_IS_IN_NAND:
wdenk13a56952004-06-09 14:58:14 +00003377
3378 Define this if you have a NAND device which you want to use
3379 for the environment.
3380
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003381 - CONFIG_ENV_OFFSET:
3382 - CONFIG_ENV_SIZE:
wdenk13a56952004-06-09 14:58:14 +00003383
3384 These two #defines specify the offset and size of the environment
Scott Woodfdd813d2010-09-17 14:38:37 -05003385 area within the first NAND device. CONFIG_ENV_OFFSET must be
3386 aligned to an erase block boundary.
wdenk5779d8d2003-12-06 23:55:10 +00003387
Scott Woodfdd813d2010-09-17 14:38:37 -05003388 - CONFIG_ENV_OFFSET_REDUND (optional):
Markus Klotzbuechere443c942006-03-20 18:02:44 +01003389
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02003390 This setting describes a second storage area of CONFIG_ENV_SIZE
Scott Woodfdd813d2010-09-17 14:38:37 -05003391 size used to hold a redundant copy of the environment data, so
3392 that there is a valid backup copy in case there is a power failure
Wolfgang Denkc0f40852011-10-26 10:21:21 +00003393 during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be
Scott Woodfdd813d2010-09-17 14:38:37 -05003394 aligned to an erase block boundary.
Markus Klotzbuechere443c942006-03-20 18:02:44 +01003395
Scott Woodfdd813d2010-09-17 14:38:37 -05003396 - CONFIG_ENV_RANGE (optional):
3397
3398 Specifies the length of the region in which the environment
3399 can be written. This should be a multiple of the NAND device's
3400 block size. Specifying a range with more erase blocks than
3401 are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3402 the range to be avoided.
3403
3404 - CONFIG_ENV_OFFSET_OOB (optional):
3405
3406 Enables support for dynamically retrieving the offset of the
3407 environment from block zero's out-of-band data. The
3408 "nand env.oob" command can be used to record this offset.
3409 Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3410 using CONFIG_ENV_OFFSET_OOB.
Markus Klotzbuechere443c942006-03-20 18:02:44 +01003411
Guennadi Liakhovetskib74ab732009-05-18 16:07:22 +02003412- CONFIG_NAND_ENV_DST
3413
3414 Defines address in RAM to which the nand_spl code should copy the
3415 environment. If redundant environment is used, it will be copied to
3416 CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3417
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003418- CONFIG_SYS_SPI_INIT_OFFSET
wdenkc6097192002-11-03 00:24:07 +00003419
3420 Defines offset to the initial SPI buffer area in DPRAM. The
3421 area is used at an early stage (ROM part) if the environment
3422 is configured to reside in the SPI EEPROM: We need a 520 byte
3423 scratch DPRAM area. It is used between the two initialization
3424 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3425 to be a good choice since it makes it far enough from the
3426 start of the data area as well as from the stack pointer.
3427
Bruce Adlere881cb52007-11-02 13:15:42 -07003428Please note that the environment is read-only until the monitor
wdenkc6097192002-11-03 00:24:07 +00003429has been relocated to RAM and a RAM copy of the environment has been
Wolfgang Denkcdb74972010-07-24 21:55:43 +02003430created; also, when using EEPROM you will have to use getenv_f()
wdenkc6097192002-11-03 00:24:07 +00003431until then to read environment variables.
3432
wdenk85ec0bc2003-03-31 16:34:49 +00003433The environment is protected by a CRC32 checksum. Before the monitor
3434is relocated into RAM, as a result of a bad CRC you will be working
3435with the compiled-in default environment - *silently*!!! [This is
3436necessary, because the first environment variable we need is the
3437"baudrate" setting for the console - if we have a bad CRC, we don't
3438have any device yet where we could complain.]
wdenkc6097192002-11-03 00:24:07 +00003439
3440Note: once the monitor has been relocated, then it will complain if
3441the default environment is used; a new CRC is computed as soon as you
wdenk85ec0bc2003-03-31 16:34:49 +00003442use the "saveenv" command to store a valid environment.
wdenkc6097192002-11-03 00:24:07 +00003443
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003444- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
wdenk42d1f032003-10-15 23:53:47 +00003445 Echo the inverted Ethernet link state to the fault LED.
wdenkfc3e2162003-10-08 22:33:00 +00003446
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003447 Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
wdenkfc3e2162003-10-08 22:33:00 +00003448 also needs to be defined.
3449
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003450- CONFIG_SYS_FAULT_MII_ADDR:
wdenk42d1f032003-10-15 23:53:47 +00003451 MII address of the PHY to check for the Ethernet link state.
wdenkc6097192002-11-03 00:24:07 +00003452
Ron Madridf5675aa2009-02-18 14:30:44 -08003453- CONFIG_NS16550_MIN_FUNCTIONS:
3454 Define this if you desire to only have use of the NS16550_init
3455 and NS16550_putc functions for the serial driver located at
3456 drivers/serial/ns16550.c. This option is useful for saving
3457 space for already greatly restricted images, including but not
3458 limited to NAND_SPL configurations.
3459
wdenkc6097192002-11-03 00:24:07 +00003460Low Level (hardware related) configuration options:
wdenkdc7c9a12003-03-26 06:55:25 +00003461---------------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00003462
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003463- CONFIG_SYS_CACHELINE_SIZE:
wdenkc6097192002-11-03 00:24:07 +00003464 Cache Line Size of the CPU.
3465
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003466- CONFIG_SYS_DEFAULT_IMMR:
wdenkc6097192002-11-03 00:24:07 +00003467 Default address of the IMMR after system reset.
wdenk2535d602003-07-17 23:16:40 +00003468
wdenk42d1f032003-10-15 23:53:47 +00003469 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
3470 and RPXsuper) to be able to adjust the position of
3471 the IMMR register after a reset.
wdenkc6097192002-11-03 00:24:07 +00003472
Timur Tabie46fedf2011-08-04 18:03:41 -05003473- CONFIG_SYS_CCSRBAR_DEFAULT:
3474 Default (power-on reset) physical address of CCSR on Freescale
3475 PowerPC SOCs.
3476
3477- CONFIG_SYS_CCSRBAR:
3478 Virtual address of CCSR. On a 32-bit build, this is typically
3479 the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3480
3481 CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3482 for cross-platform code that uses that macro instead.
3483
3484- CONFIG_SYS_CCSRBAR_PHYS:
3485 Physical address of CCSR. CCSR can be relocated to a new
3486 physical address, if desired. In this case, this macro should
Wolfgang Denkc0f40852011-10-26 10:21:21 +00003487 be set to that address. Otherwise, it should be set to the
Timur Tabie46fedf2011-08-04 18:03:41 -05003488 same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR
3489 is typically relocated on 36-bit builds. It is recommended
3490 that this macro be defined via the _HIGH and _LOW macros:
3491
3492 #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3493 * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3494
3495- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
Wolfgang Denk4cf26092011-10-07 09:58:21 +02003496 Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically
3497 either 0 (32-bit build) or 0xF (36-bit build). This macro is
Timur Tabie46fedf2011-08-04 18:03:41 -05003498 used in assembly code, so it must not contain typecasts or
3499 integer size suffixes (e.g. "ULL").
3500
3501- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3502 Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is
3503 used in assembly code, so it must not contain typecasts or
3504 integer size suffixes (e.g. "ULL").
3505
3506- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3507 If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3508 forced to a value that ensures that CCSR is not relocated.
3509
wdenk7f6c2cb2002-11-10 22:06:23 +00003510- Floppy Disk Support:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003511 CONFIG_SYS_FDC_DRIVE_NUMBER
wdenk7f6c2cb2002-11-10 22:06:23 +00003512
3513 the default drive number (default value 0)
3514
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003515 CONFIG_SYS_ISA_IO_STRIDE
wdenk7f6c2cb2002-11-10 22:06:23 +00003516
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003517 defines the spacing between FDC chipset registers
wdenk7f6c2cb2002-11-10 22:06:23 +00003518 (default value 1)
3519
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003520 CONFIG_SYS_ISA_IO_OFFSET
wdenk7f6c2cb2002-11-10 22:06:23 +00003521
wdenk43d96162003-03-06 00:02:04 +00003522 defines the offset of register from address. It
3523 depends on which part of the data bus is connected to
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003524 the FDC chipset. (default value 0)
wdenk7f6c2cb2002-11-10 22:06:23 +00003525
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003526 If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
3527 CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
wdenk43d96162003-03-06 00:02:04 +00003528 default value.
wdenk7f6c2cb2002-11-10 22:06:23 +00003529
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003530 if CONFIG_SYS_FDC_HW_INIT is defined, then the function
wdenk43d96162003-03-06 00:02:04 +00003531 fdc_hw_init() is called at the beginning of the FDC
3532 setup. fdc_hw_init() must be provided by the board
3533 source code. It is used to make hardware dependant
3534 initializations.
wdenk7f6c2cb2002-11-10 22:06:23 +00003535
Macpaul Lin0abddf82011-04-11 20:45:32 +00003536- CONFIG_IDE_AHB:
3537 Most IDE controllers were designed to be connected with PCI
3538 interface. Only few of them were designed for AHB interface.
3539 When software is doing ATA command and data transfer to
3540 IDE devices through IDE-AHB controller, some additional
3541 registers accessing to these kind of IDE-AHB controller
3542 is requierd.
3543
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003544- CONFIG_SYS_IMMR: Physical address of the Internal Memory.
wdenkefe2a4d2004-12-16 21:44:03 +00003545 DO NOT CHANGE unless you know exactly what you're
wdenk25d67122004-12-10 11:40:40 +00003546 doing! (11-4) [MPC8xx/82xx systems only]
wdenkc6097192002-11-03 00:24:07 +00003547
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003548- CONFIG_SYS_INIT_RAM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00003549
wdenk7152b1d2003-09-05 23:19:14 +00003550 Start address of memory area that can be used for
wdenkc6097192002-11-03 00:24:07 +00003551 initial data and stack; please note that this must be
3552 writable memory that is working WITHOUT special
3553 initialization, i. e. you CANNOT use normal RAM which
3554 will become available only after programming the
3555 memory controller and running certain initialization
3556 sequences.
3557
3558 U-Boot uses the following memory types:
3559 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3560 - MPC824X: data cache
3561 - PPC4xx: data cache
3562
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003563- CONFIG_SYS_GBL_DATA_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00003564
3565 Offset of the initial data structure in the memory
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003566 area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
3567 CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
wdenkc6097192002-11-03 00:24:07 +00003568 data is located at the end of the available space
Wolfgang Denk553f0982010-10-26 13:32:32 +02003569 (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003570 CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
3571 below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
3572 CONFIG_SYS_GBL_DATA_OFFSET) downward.
wdenkc6097192002-11-03 00:24:07 +00003573
3574 Note:
3575 On the MPC824X (or other systems that use the data
3576 cache for initial memory) the address chosen for
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003577 CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
wdenkc6097192002-11-03 00:24:07 +00003578 point to an otherwise UNUSED address space between
3579 the top of RAM and the start of the PCI space.
3580
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003581- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
wdenkc6097192002-11-03 00:24:07 +00003582
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003583- CONFIG_SYS_SYPCR: System Protection Control (11-9)
wdenkc6097192002-11-03 00:24:07 +00003584
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003585- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
wdenkc6097192002-11-03 00:24:07 +00003586
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003587- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
wdenkc6097192002-11-03 00:24:07 +00003588
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003589- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
wdenkc6097192002-11-03 00:24:07 +00003590
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003591- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
wdenkc6097192002-11-03 00:24:07 +00003592
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003593- CONFIG_SYS_OR_TIMING_SDRAM:
wdenkc6097192002-11-03 00:24:07 +00003594 SDRAM timing
3595
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003596- CONFIG_SYS_MAMR_PTA:
wdenkc6097192002-11-03 00:24:07 +00003597 periodic timer for refresh
3598
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003599- CONFIG_SYS_DER: Debug Event Register (37-47)
wdenkc6097192002-11-03 00:24:07 +00003600
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003601- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
3602 CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
3603 CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
3604 CONFIG_SYS_BR1_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00003605 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3606
3607- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003608 CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
3609 CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00003610 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3611
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003612- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
3613 CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
wdenkc6097192002-11-03 00:24:07 +00003614 Machine Mode Register and Memory Periodic Timer
3615 Prescaler definitions (SDRAM timing)
3616
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003617- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00003618 enable I2C microcode relocation patch (MPC8xx);
3619 define relocation offset in DPRAM [DSP2]
3620
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003621- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
Heiko Schocherb423d052008-01-11 01:12:07 +01003622 enable SMC microcode relocation patch (MPC8xx);
3623 define relocation offset in DPRAM [SMC1]
3624
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003625- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00003626 enable SPI microcode relocation patch (MPC8xx);
3627 define relocation offset in DPRAM [SCC4]
3628
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003629- CONFIG_SYS_USE_OSCCLK:
wdenkc6097192002-11-03 00:24:07 +00003630 Use OSCM clock mode on MBX8xx board. Be careful,
3631 wrong setting might damage your board. Read
3632 doc/README.MBX before setting this variable!
3633
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003634- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
wdenk43d96162003-03-06 00:02:04 +00003635 Offset of the bootmode word in DPRAM used by post
3636 (Power On Self Tests). This definition overrides
3637 #define'd default value in commproc.h resp.
3638 cpm_8260.h.
wdenkea909b72002-11-21 23:11:29 +00003639
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003640- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
3641 CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
3642 CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
3643 CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
3644 CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
3645 CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
3646 CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
3647 CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
Stefan Roesea47a12b2010-04-15 16:07:28 +02003648 Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
wdenk5d232d02003-05-22 22:52:13 +00003649
Dirk Eibach9cacf4f2009-02-09 08:18:34 +01003650- CONFIG_PCI_DISABLE_PCIE:
3651 Disable PCI-Express on systems where it is supported but not
3652 required.
3653
Andrew Sharp69fd2d32012-08-29 14:16:32 +00003654- CONFIG_PCI_ENUM_ONLY
3655 Only scan through and get the devices on the busses.
3656 Don't do any setup work, presumably because someone or
3657 something has already done it, and we don't need to do it
3658 a second time. Useful for platforms that are pre-booted
3659 by coreboot or similar.
3660
Kumar Galaa09b9b62010-12-30 12:09:53 -06003661- CONFIG_SYS_SRIO:
3662 Chip has SRIO or not
3663
3664- CONFIG_SRIO1:
3665 Board has SRIO 1 port available
3666
3667- CONFIG_SRIO2:
3668 Board has SRIO 2 port available
3669
3670- CONFIG_SYS_SRIOn_MEM_VIRT:
3671 Virtual Address of SRIO port 'n' memory region
3672
3673- CONFIG_SYS_SRIOn_MEM_PHYS:
3674 Physical Address of SRIO port 'n' memory region
3675
3676- CONFIG_SYS_SRIOn_MEM_SIZE:
3677 Size of SRIO port 'n' memory region
3678
Alex Watermaneced4622011-05-19 15:08:36 -04003679- CONFIG_SYS_NDFC_16
3680 Defined to tell the NDFC that the NAND chip is using a
3681 16 bit bus.
3682
3683- CONFIG_SYS_NDFC_EBC0_CFG
3684 Sets the EBC0_CFG register for the NDFC. If not defined
3685 a default value will be used.
3686
Ben Warrenbb99ad62006-09-07 16:50:54 -04003687- CONFIG_SPD_EEPROM
Wolfgang Denk218ca722008-03-26 10:40:12 +01003688 Get DDR timing information from an I2C EEPROM. Common
3689 with pluggable memory modules such as SODIMMs
3690
Ben Warrenbb99ad62006-09-07 16:50:54 -04003691 SPD_EEPROM_ADDRESS
3692 I2C address of the SPD EEPROM
3693
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003694- CONFIG_SYS_SPD_BUS_NUM
Wolfgang Denk218ca722008-03-26 10:40:12 +01003695 If SPD EEPROM is on an I2C bus other than the first
3696 one, specify here. Note that the value must resolve
3697 to something your driver can deal with.
Ben Warrenbb99ad62006-09-07 16:50:54 -04003698
York Sun1b3e3c42011-06-07 09:42:16 +08003699- CONFIG_SYS_DDR_RAW_TIMING
3700 Get DDR timing information from other than SPD. Common with
3701 soldered DDR chips onboard without SPD. DDR raw timing
3702 parameters are extracted from datasheet and hard-coded into
3703 header files or board specific files.
3704
York Sun6f5e1dc2011-09-16 13:21:35 -07003705- CONFIG_FSL_DDR_INTERACTIVE
3706 Enable interactive DDR debugging. See doc/README.fsl-ddr.
3707
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003708- CONFIG_SYS_83XX_DDR_USES_CS0
Wolfgang Denk218ca722008-03-26 10:40:12 +01003709 Only for 83xx systems. If specified, then DDR should
3710 be configured using CS0 and CS1 instead of CS2 and CS3.
Timur Tabi2ad6b512006-10-31 18:44:42 -06003711
wdenkc26e4542004-04-18 10:13:26 +00003712- CONFIG_ETHER_ON_FEC[12]
3713 Define to enable FEC[12] on a 8xx series processor.
3714
3715- CONFIG_FEC[12]_PHY
3716 Define to the hardcoded PHY address which corresponds
wdenk6e592382004-04-18 17:39:38 +00003717 to the given FEC; i. e.
3718 #define CONFIG_FEC1_PHY 4
wdenkc26e4542004-04-18 10:13:26 +00003719 means that the PHY with address 4 is connected to FEC1
3720
3721 When set to -1, means to probe for first available.
3722
3723- CONFIG_FEC[12]_PHY_NORXERR
3724 The PHY does not have a RXERR line (RMII only).
3725 (so program the FEC to ignore it).
3726
3727- CONFIG_RMII
3728 Enable RMII mode for all FECs.
3729 Note that this is a global option, we can't
3730 have one FEC in standard MII mode and another in RMII mode.
3731
wdenk5cf91d62004-04-23 20:32:05 +00003732- CONFIG_CRC32_VERIFY
3733 Add a verify option to the crc32 command.
3734 The syntax is:
3735
3736 => crc32 -v <address> <count> <crc32>
3737
3738 Where address/count indicate a memory area
3739 and crc32 is the correct crc32 which the
3740 area should have.
3741
wdenk56523f12004-07-11 17:40:54 +00003742- CONFIG_LOOPW
3743 Add the "loopw" memory command. This only takes effect if
Jon Loeliger602ad3b2007-06-11 19:03:39 -05003744 the memory commands are activated globally (CONFIG_CMD_MEM).
wdenk56523f12004-07-11 17:40:54 +00003745
stroese7b466642004-12-16 18:46:55 +00003746- CONFIG_MX_CYCLIC
3747 Add the "mdc" and "mwc" memory commands. These are cyclic
3748 "md/mw" commands.
3749 Examples:
3750
wdenkefe2a4d2004-12-16 21:44:03 +00003751 => mdc.b 10 4 500
stroese7b466642004-12-16 18:46:55 +00003752 This command will print 4 bytes (10,11,12,13) each 500 ms.
3753
wdenkefe2a4d2004-12-16 21:44:03 +00003754 => mwc.l 100 12345678 10
stroese7b466642004-12-16 18:46:55 +00003755 This command will write 12345678 to address 100 all 10 ms.
3756
wdenkefe2a4d2004-12-16 21:44:03 +00003757 This only takes effect if the memory commands are activated
Jon Loeliger602ad3b2007-06-11 19:03:39 -05003758 globally (CONFIG_CMD_MEM).
stroese7b466642004-12-16 18:46:55 +00003759
wdenk8aa1a2d2005-04-04 12:44:11 +00003760- CONFIG_SKIP_LOWLEVEL_INIT
Macpaul Linafc1ce82011-10-19 20:41:11 +00003761 [ARM, NDS32, MIPS only] If this variable is defined, then certain
Wolfgang Denk844f07d2010-11-27 23:30:56 +01003762 low level initializations (like setting up the memory
3763 controller) are omitted and/or U-Boot does not
3764 relocate itself into RAM.
wdenk8aa1a2d2005-04-04 12:44:11 +00003765
Wolfgang Denk844f07d2010-11-27 23:30:56 +01003766 Normally this variable MUST NOT be defined. The only
3767 exception is when U-Boot is loaded (to RAM) by some
3768 other boot loader or by a debugger which performs
3769 these initializations itself.
wdenk8aa1a2d2005-04-04 12:44:11 +00003770
Aneesh V401bb302011-07-13 05:11:07 +00003771- CONFIG_SPL_BUILD
Magnus Liljadf812382009-06-13 20:50:00 +02003772 Modifies the behaviour of start.S when compiling a loader
3773 that is executed before the actual U-Boot. E.g. when
3774 compiling a NAND SPL.
wdenk400558b2005-04-02 23:52:25 +00003775
Matthias Weisserd8834a12011-03-10 21:36:32 +00003776- CONFIG_USE_ARCH_MEMCPY
3777 CONFIG_USE_ARCH_MEMSET
3778 If these options are used a optimized version of memcpy/memset will
3779 be used if available. These functions may be faster under some
3780 conditions but may increase the binary size.
3781
Gabe Blackb16f5212012-11-27 21:08:06 +00003782- CONFIG_X86_NO_RESET_VECTOR
3783 If defined, the x86 reset vector code is excluded. You will need
3784 to do this when U-Boot is running from Coreboot.
3785
Gabe Black5b5ece92012-11-29 16:23:41 +00003786- CONFIG_X86_NO_REAL_MODE
3787 If defined, x86 real mode code is omitted. This assumes a
3788 32-bit environment where such code is not needed. You will
3789 need to do this when U-Boot is running from Coreboot.
3790
3791
Timur Tabif2717b42011-11-22 09:21:25 -06003792Freescale QE/FMAN Firmware Support:
3793-----------------------------------
3794
3795The Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
3796loading of "firmware", which is encoded in the QE firmware binary format.
3797This firmware often needs to be loaded during U-Boot booting, so macros
3798are used to identify the storage device (NOR flash, SPI, etc) and the address
3799within that device.
3800
3801- CONFIG_SYS_QE_FMAN_FW_ADDR
3802 The address in the storage device where the firmware is located. The
3803 meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
3804 is also specified.
3805
3806- CONFIG_SYS_QE_FMAN_FW_LENGTH
3807 The maximum possible size of the firmware. The firmware binary format
3808 has a field that specifies the actual size of the firmware, but it
3809 might not be possible to read any part of the firmware unless some
3810 local storage is allocated to hold the entire firmware first.
3811
3812- CONFIG_SYS_QE_FMAN_FW_IN_NOR
3813 Specifies that QE/FMAN firmware is located in NOR flash, mapped as
3814 normal addressable memory via the LBC. CONFIG_SYS_FMAN_FW_ADDR is the
3815 virtual address in NOR flash.
3816
3817- CONFIG_SYS_QE_FMAN_FW_IN_NAND
3818 Specifies that QE/FMAN firmware is located in NAND flash.
3819 CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
3820
3821- CONFIG_SYS_QE_FMAN_FW_IN_MMC
3822 Specifies that QE/FMAN firmware is located on the primary SD/MMC
3823 device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3824
3825- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
3826 Specifies that QE/FMAN firmware is located on the primary SPI
3827 device. CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
3828
Liu Gang292dc6c2012-03-08 00:33:18 +00003829- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
3830 Specifies that QE/FMAN firmware is located in the remote (master)
3831 memory space. CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
Liu Gangfc54c7f2012-08-09 05:10:01 +00003832 can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
3833 window->master inbound window->master LAW->the ucode address in
3834 master's memory space.
Timur Tabif2717b42011-11-22 09:21:25 -06003835
wdenkc6097192002-11-03 00:24:07 +00003836Building the Software:
3837======================
3838
Wolfgang Denk218ca722008-03-26 10:40:12 +01003839Building U-Boot has been tested in several native build environments
3840and in many different cross environments. Of course we cannot support
3841all possibly existing versions of cross development tools in all
3842(potentially obsolete) versions. In case of tool chain problems we
3843recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3844which is extensively used to build and test U-Boot.
wdenkc6097192002-11-03 00:24:07 +00003845
Wolfgang Denk218ca722008-03-26 10:40:12 +01003846If you are not using a native environment, it is assumed that you
3847have GNU cross compiling tools available in your path. In this case,
3848you must set the environment variable CROSS_COMPILE in your shell.
3849Note that no changes to the Makefile or any other source files are
3850necessary. For example using the ELDK on a 4xx CPU, please enter:
wdenkc6097192002-11-03 00:24:07 +00003851
Wolfgang Denk218ca722008-03-26 10:40:12 +01003852 $ CROSS_COMPILE=ppc_4xx-
3853 $ export CROSS_COMPILE
wdenkc6097192002-11-03 00:24:07 +00003854
Peter Tyser2f8d3962009-03-13 18:54:51 -05003855Note: If you wish to generate Windows versions of the utilities in
3856 the tools directory you can use the MinGW toolchain
3857 (http://www.mingw.org). Set your HOST tools to the MinGW
3858 toolchain and execute 'make tools'. For example:
3859
3860 $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
3861
3862 Binaries such as tools/mkimage.exe will be created which can
3863 be executed on computers running Windows.
3864
Wolfgang Denk218ca722008-03-26 10:40:12 +01003865U-Boot is intended to be simple to build. After installing the
3866sources you must configure U-Boot for one specific board type. This
wdenkc6097192002-11-03 00:24:07 +00003867is done by typing:
3868
3869 make NAME_config
3870
Wolfgang Denk218ca722008-03-26 10:40:12 +01003871where "NAME_config" is the name of one of the existing configu-
Michael Jones4d675ae2012-03-15 22:48:10 +00003872rations; see boards.cfg for supported names.
wdenk54387ac2003-10-08 22:45:44 +00003873
wdenk2729af92004-05-03 20:45:30 +00003874Note: for some board special configuration names may exist; check if
3875 additional information is available from the board vendor; for
3876 instance, the TQM823L systems are available without (standard)
3877 or with LCD support. You can select such additional "features"
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003878 when choosing the configuration, i. e.
wdenkc6097192002-11-03 00:24:07 +00003879
wdenk2729af92004-05-03 20:45:30 +00003880 make TQM823L_config
3881 - will configure for a plain TQM823L, i. e. no LCD support
wdenkc6097192002-11-03 00:24:07 +00003882
wdenk2729af92004-05-03 20:45:30 +00003883 make TQM823L_LCD_config
3884 - will configure for a TQM823L with U-Boot console on LCD
wdenkc6097192002-11-03 00:24:07 +00003885
wdenk2729af92004-05-03 20:45:30 +00003886 etc.
wdenkc6097192002-11-03 00:24:07 +00003887
wdenkc6097192002-11-03 00:24:07 +00003888
wdenk2729af92004-05-03 20:45:30 +00003889Finally, type "make all", and you should get some working U-Boot
3890images ready for download to / installation on your system:
wdenkc6097192002-11-03 00:24:07 +00003891
wdenk2729af92004-05-03 20:45:30 +00003892- "u-boot.bin" is a raw binary image
3893- "u-boot" is an image in ELF binary format
3894- "u-boot.srec" is in Motorola S-Record format
wdenkc6097192002-11-03 00:24:07 +00003895
Marian Balakowiczbaf31242006-09-07 17:25:40 +02003896By default the build is performed locally and the objects are saved
3897in the source directory. One of the two methods can be used to change
3898this behavior and build U-Boot to some external directory:
3899
39001. Add O= to the make command line invocations:
3901
3902 make O=/tmp/build distclean
3903 make O=/tmp/build NAME_config
3904 make O=/tmp/build all
3905
39062. Set environment variable BUILD_DIR to point to the desired location:
3907
3908 export BUILD_DIR=/tmp/build
3909 make distclean
3910 make NAME_config
3911 make all
3912
3913Note that the command line "O=" setting overrides the BUILD_DIR environment
3914variable.
3915
wdenkc6097192002-11-03 00:24:07 +00003916
wdenk2729af92004-05-03 20:45:30 +00003917Please be aware that the Makefiles assume you are using GNU make, so
3918for instance on NetBSD you might need to use "gmake" instead of
3919native "make".
wdenkc6097192002-11-03 00:24:07 +00003920
wdenkc6097192002-11-03 00:24:07 +00003921
wdenk2729af92004-05-03 20:45:30 +00003922If the system board that you have is not listed, then you will need
3923to port U-Boot to your hardware platform. To do this, follow these
3924steps:
wdenkc6097192002-11-03 00:24:07 +00003925
wdenk2729af92004-05-03 20:45:30 +000039261. Add a new configuration option for your board to the toplevel
Michael Jones4d675ae2012-03-15 22:48:10 +00003927 "boards.cfg" file, using the existing entries as examples.
3928 Follow the instructions there to keep the boards in order.
wdenk2729af92004-05-03 20:45:30 +000039292. Create a new directory to hold your board specific code. Add any
3930 files you need. In your board directory, you will need at least
3931 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
39323. Create a new configuration file "include/configs/<board>.h" for
3933 your board
39343. If you're porting U-Boot to a new CPU, then also create a new
3935 directory to hold your CPU specific code. Add any files you need.
39364. Run "make <board>_config" with your new name.
39375. Type "make", and you should get a working "u-boot.srec" file
3938 to be installed on your target system.
39396. Debug and solve any problems that might arise.
3940 [Of course, this last step is much harder than it sounds.]
wdenkc6097192002-11-03 00:24:07 +00003941
wdenkc6097192002-11-03 00:24:07 +00003942
wdenk2729af92004-05-03 20:45:30 +00003943Testing of U-Boot Modifications, Ports to New Hardware, etc.:
3944==============================================================
wdenkc6097192002-11-03 00:24:07 +00003945
Wolfgang Denk218ca722008-03-26 10:40:12 +01003946If you have modified U-Boot sources (for instance added a new board
3947or support for new devices, a new CPU, etc.) you are expected to
wdenk2729af92004-05-03 20:45:30 +00003948provide feedback to the other developers. The feedback normally takes
3949the form of a "patch", i. e. a context diff against a certain (latest
Wolfgang Denk218ca722008-03-26 10:40:12 +01003950official or latest in the git repository) version of U-Boot sources.
wdenkc6097192002-11-03 00:24:07 +00003951
Wolfgang Denk218ca722008-03-26 10:40:12 +01003952But before you submit such a patch, please verify that your modifi-
3953cation did not break existing code. At least make sure that *ALL* of
wdenk2729af92004-05-03 20:45:30 +00003954the supported boards compile WITHOUT ANY compiler warnings. To do so,
3955just run the "MAKEALL" script, which will configure and build U-Boot
Wolfgang Denk218ca722008-03-26 10:40:12 +01003956for ALL supported system. Be warned, this will take a while. You can
3957select which (cross) compiler to use by passing a `CROSS_COMPILE'
3958environment variable to the script, i. e. to use the ELDK cross tools
3959you can type
wdenkc6097192002-11-03 00:24:07 +00003960
wdenk2729af92004-05-03 20:45:30 +00003961 CROSS_COMPILE=ppc_8xx- MAKEALL
wdenkc6097192002-11-03 00:24:07 +00003962
wdenk2729af92004-05-03 20:45:30 +00003963or to build on a native PowerPC system you can type
wdenkc6097192002-11-03 00:24:07 +00003964
wdenk2729af92004-05-03 20:45:30 +00003965 CROSS_COMPILE=' ' MAKEALL
wdenkc6097192002-11-03 00:24:07 +00003966
Wolfgang Denk218ca722008-03-26 10:40:12 +01003967When using the MAKEALL script, the default behaviour is to build
3968U-Boot in the source directory. This location can be changed by
3969setting the BUILD_DIR environment variable. Also, for each target
3970built, the MAKEALL script saves two log files (<target>.ERR and
3971<target>.MAKEALL) in the <source dir>/LOG directory. This default
3972location can be changed by setting the MAKEALL_LOGDIR environment
3973variable. For example:
Marian Balakowiczbaf31242006-09-07 17:25:40 +02003974
3975 export BUILD_DIR=/tmp/build
3976 export MAKEALL_LOGDIR=/tmp/log
3977 CROSS_COMPILE=ppc_8xx- MAKEALL
3978
Wolfgang Denk218ca722008-03-26 10:40:12 +01003979With the above settings build objects are saved in the /tmp/build,
3980log files are saved in the /tmp/log and the source tree remains clean
3981during the whole build process.
Marian Balakowiczbaf31242006-09-07 17:25:40 +02003982
3983
wdenk2729af92004-05-03 20:45:30 +00003984See also "U-Boot Porting Guide" below.
wdenkc6097192002-11-03 00:24:07 +00003985
wdenkc6097192002-11-03 00:24:07 +00003986
wdenk2729af92004-05-03 20:45:30 +00003987Monitor Commands - Overview:
3988============================
wdenkc6097192002-11-03 00:24:07 +00003989
wdenk2729af92004-05-03 20:45:30 +00003990go - start application at address 'addr'
3991run - run commands in an environment variable
3992bootm - boot application image from memory
3993bootp - boot image via network using BootP/TFTP protocol
Marek Vasut44f074c2012-03-14 21:52:45 +00003994bootz - boot zImage from memory
wdenk2729af92004-05-03 20:45:30 +00003995tftpboot- boot image via network using TFTP protocol
3996 and env variables "ipaddr" and "serverip"
3997 (and eventually "gatewayip")
Simon Glass1fb7cd42011-10-24 18:00:07 +00003998tftpput - upload a file via network using TFTP protocol
wdenk2729af92004-05-03 20:45:30 +00003999rarpboot- boot image via network using RARP/TFTP protocol
4000diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
4001loads - load S-Record file over serial line
4002loadb - load binary file over serial line (kermit mode)
4003md - memory display
4004mm - memory modify (auto-incrementing)
4005nm - memory modify (constant address)
4006mw - memory write (fill)
4007cp - memory copy
4008cmp - memory compare
4009crc32 - checksum calculation
Peter Tyser0f89c542009-04-18 22:34:03 -05004010i2c - I2C sub-system
wdenk2729af92004-05-03 20:45:30 +00004011sspi - SPI utility commands
4012base - print or set address offset
4013printenv- print environment variables
4014setenv - set environment variables
4015saveenv - save environment variables to persistent storage
4016protect - enable or disable FLASH write protection
4017erase - erase FLASH memory
4018flinfo - print FLASH memory information
Karl O. Pinc10635af2012-08-03 05:57:21 +00004019nand - NAND memory operations (see doc/README.nand)
wdenk2729af92004-05-03 20:45:30 +00004020bdinfo - print Board Info structure
4021iminfo - print header information for application image
4022coninfo - print console devices and informations
4023ide - IDE sub-system
4024loop - infinite loop on address range
wdenk56523f12004-07-11 17:40:54 +00004025loopw - infinite write loop on address range
wdenk2729af92004-05-03 20:45:30 +00004026mtest - simple RAM test
4027icache - enable or disable instruction cache
4028dcache - enable or disable data cache
4029reset - Perform RESET of the CPU
4030echo - echo args to console
4031version - print monitor version
4032help - print online help
4033? - alias for 'help'
wdenkc6097192002-11-03 00:24:07 +00004034
wdenkc6097192002-11-03 00:24:07 +00004035
wdenk2729af92004-05-03 20:45:30 +00004036Monitor Commands - Detailed Description:
4037========================================
wdenkc6097192002-11-03 00:24:07 +00004038
wdenk2729af92004-05-03 20:45:30 +00004039TODO.
wdenkc6097192002-11-03 00:24:07 +00004040
wdenk2729af92004-05-03 20:45:30 +00004041For now: just type "help <command>".
wdenkc6097192002-11-03 00:24:07 +00004042
4043
wdenk2729af92004-05-03 20:45:30 +00004044Environment Variables:
4045======================
wdenkc6097192002-11-03 00:24:07 +00004046
wdenk2729af92004-05-03 20:45:30 +00004047U-Boot supports user configuration using Environment Variables which
4048can be made persistent by saving to Flash memory.
wdenkc6097192002-11-03 00:24:07 +00004049
wdenk2729af92004-05-03 20:45:30 +00004050Environment Variables are set using "setenv", printed using
4051"printenv", and saved to Flash using "saveenv". Using "setenv"
4052without a value can be used to delete a variable from the
4053environment. As long as you don't save the environment you are
4054working with an in-memory copy. In case the Flash area containing the
4055environment is erased by accident, a default environment is provided.
wdenkc6097192002-11-03 00:24:07 +00004056
Wolfgang Denkc96f86e2010-01-17 23:55:53 +01004057Some configuration options can be set using Environment Variables.
4058
4059List of environment variables (most likely not complete):
wdenkc6097192002-11-03 00:24:07 +00004060
wdenk2729af92004-05-03 20:45:30 +00004061 baudrate - see CONFIG_BAUDRATE
wdenkc6097192002-11-03 00:24:07 +00004062
wdenk2729af92004-05-03 20:45:30 +00004063 bootdelay - see CONFIG_BOOTDELAY
wdenkc6097192002-11-03 00:24:07 +00004064
wdenk2729af92004-05-03 20:45:30 +00004065 bootcmd - see CONFIG_BOOTCOMMAND
wdenkc6097192002-11-03 00:24:07 +00004066
wdenk2729af92004-05-03 20:45:30 +00004067 bootargs - Boot arguments when booting an RTOS image
wdenkc6097192002-11-03 00:24:07 +00004068
wdenk2729af92004-05-03 20:45:30 +00004069 bootfile - Name of the image to load with TFTP
wdenkc6097192002-11-03 00:24:07 +00004070
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02004071 bootm_low - Memory range available for image processing in the bootm
4072 command can be restricted. This variable is given as
4073 a hexadecimal number and defines lowest address allowed
4074 for use by the bootm command. See also "bootm_size"
4075 environment variable. Address defined by "bootm_low" is
4076 also the base of the initial memory mapping for the Linux
Grant Likelyc3624e62011-03-28 09:58:43 +00004077 kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
4078 bootm_mapsize.
4079
Wolfgang Denkc0f40852011-10-26 10:21:21 +00004080 bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
Grant Likelyc3624e62011-03-28 09:58:43 +00004081 This variable is given as a hexadecimal number and it
4082 defines the size of the memory region starting at base
4083 address bootm_low that is accessible by the Linux kernel
4084 during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used
4085 as the default value if it is defined, and bootm_size is
4086 used otherwise.
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02004087
4088 bootm_size - Memory range available for image processing in the bootm
4089 command can be restricted. This variable is given as
4090 a hexadecimal number and defines the size of the region
4091 allowed for use by the bootm command. See also "bootm_low"
4092 environment variable.
4093
Bartlomiej Sieka4bae9092008-10-01 15:26:31 +02004094 updatefile - Location of the software update file on a TFTP server, used
4095 by the automatic software update feature. Please refer to
4096 documentation in doc/README.update for more details.
4097
wdenk2729af92004-05-03 20:45:30 +00004098 autoload - if set to "no" (any string beginning with 'n'),
4099 "bootp" will just load perform a lookup of the
4100 configuration from the BOOTP server, but not try to
4101 load any image using TFTP
wdenkc6097192002-11-03 00:24:07 +00004102
wdenk2729af92004-05-03 20:45:30 +00004103 autostart - if set to "yes", an image loaded using the "bootp",
4104 "rarpboot", "tftpboot" or "diskboot" commands will
4105 be automatically started (by internally calling
4106 "bootm")
wdenkc6097192002-11-03 00:24:07 +00004107
wdenk2729af92004-05-03 20:45:30 +00004108 If set to "no", a standalone image passed to the
4109 "bootm" command will be copied to the load address
4110 (and eventually uncompressed), but NOT be started.
4111 This can be used to load and uncompress arbitrary
4112 data.
wdenkc6097192002-11-03 00:24:07 +00004113
David A. Longa28afca2011-07-09 16:40:19 -04004114 fdt_high - if set this restricts the maximum address that the
4115 flattened device tree will be copied into upon boot.
Shawn Guofa34f6b2012-01-09 21:54:08 +00004116 For example, if you have a system with 1 GB memory
4117 at physical address 0x10000000, while Linux kernel
4118 only recognizes the first 704 MB as low memory, you
4119 may need to set fdt_high as 0x3C000000 to have the
4120 device tree blob be copied to the maximum address
4121 of the 704 MB low memory, so that Linux kernel can
4122 access it during the boot procedure.
4123
David A. Longa28afca2011-07-09 16:40:19 -04004124 If this is set to the special value 0xFFFFFFFF then
4125 the fdt will not be copied at all on boot. For this
4126 to work it must reside in writable memory, have
4127 sufficient padding on the end of it for u-boot to
4128 add the information it needs into it, and the memory
4129 must be accessible by the kernel.
4130
Simon Glasseea63e02011-10-24 19:15:34 +00004131 fdtcontroladdr- if set this is the address of the control flattened
4132 device tree used by U-Boot when CONFIG_OF_CONTROL is
4133 defined.
4134
wdenk17ea1172004-06-06 21:51:03 +00004135 i2cfast - (PPC405GP|PPC405EP only)
4136 if set to 'y' configures Linux I2C driver for fast
4137 mode (400kHZ). This environment variable is used in
4138 initialization code. So, for changes to be effective
4139 it must be saved and board must be reset.
4140
wdenk2729af92004-05-03 20:45:30 +00004141 initrd_high - restrict positioning of initrd images:
4142 If this variable is not set, initrd images will be
4143 copied to the highest possible address in RAM; this
4144 is usually what you want since it allows for
4145 maximum initrd size. If for some reason you want to
4146 make sure that the initrd image is loaded below the
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004147 CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
wdenk2729af92004-05-03 20:45:30 +00004148 variable to a value of "no" or "off" or "0".
4149 Alternatively, you can set it to a maximum upper
4150 address to use (U-Boot will still check that it
4151 does not overwrite the U-Boot stack and data).
wdenkc6097192002-11-03 00:24:07 +00004152
wdenk2729af92004-05-03 20:45:30 +00004153 For instance, when you have a system with 16 MB
4154 RAM, and want to reserve 4 MB from use by Linux,
4155 you can do this by adding "mem=12M" to the value of
4156 the "bootargs" variable. However, now you must make
4157 sure that the initrd image is placed in the first
4158 12 MB as well - this can be done with
wdenkc6097192002-11-03 00:24:07 +00004159
wdenk2729af92004-05-03 20:45:30 +00004160 setenv initrd_high 00c00000
wdenkc6097192002-11-03 00:24:07 +00004161
wdenk2729af92004-05-03 20:45:30 +00004162 If you set initrd_high to 0xFFFFFFFF, this is an
4163 indication to U-Boot that all addresses are legal
4164 for the Linux kernel, including addresses in flash
4165 memory. In this case U-Boot will NOT COPY the
4166 ramdisk at all. This may be useful to reduce the
4167 boot time on your system, but requires that this
4168 feature is supported by your Linux kernel.
wdenk4a6fd342003-04-12 23:38:12 +00004169
wdenk2729af92004-05-03 20:45:30 +00004170 ipaddr - IP address; needed for tftpboot command
wdenkc6097192002-11-03 00:24:07 +00004171
wdenk2729af92004-05-03 20:45:30 +00004172 loadaddr - Default load address for commands like "bootp",
4173 "rarpboot", "tftpboot", "loadb" or "diskboot"
wdenkc6097192002-11-03 00:24:07 +00004174
wdenk2729af92004-05-03 20:45:30 +00004175 loads_echo - see CONFIG_LOADS_ECHO
wdenkc6097192002-11-03 00:24:07 +00004176
wdenk2729af92004-05-03 20:45:30 +00004177 serverip - TFTP server IP address; needed for tftpboot command
wdenk38b99262003-05-23 23:18:21 +00004178
wdenk2729af92004-05-03 20:45:30 +00004179 bootretry - see CONFIG_BOOT_RETRY_TIME
wdenkc6097192002-11-03 00:24:07 +00004180
wdenk2729af92004-05-03 20:45:30 +00004181 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
wdenkc6097192002-11-03 00:24:07 +00004182
wdenk2729af92004-05-03 20:45:30 +00004183 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
wdenkc6097192002-11-03 00:24:07 +00004184
Mike Frysingere2a53452011-10-02 10:01:27 +00004185 ethprime - controls which interface is used first.
wdenkc6097192002-11-03 00:24:07 +00004186
Mike Frysingere2a53452011-10-02 10:01:27 +00004187 ethact - controls which interface is currently active.
4188 For example you can do the following
wdenkc6097192002-11-03 00:24:07 +00004189
Heiko Schocher48690d82010-07-20 17:45:02 +02004190 => setenv ethact FEC
4191 => ping 192.168.0.1 # traffic sent on FEC
4192 => setenv ethact SCC
4193 => ping 10.0.0.1 # traffic sent on SCC
wdenkc6097192002-11-03 00:24:07 +00004194
Matthias Fuchse1692572008-01-17 07:45:05 +01004195 ethrotate - When set to "no" U-Boot does not go through all
4196 available network interfaces.
4197 It just stays at the currently selected interface.
4198
Wolfgang Denkc96f86e2010-01-17 23:55:53 +01004199 netretry - When set to "no" each network operation will
wdenk2729af92004-05-03 20:45:30 +00004200 either succeed or fail without retrying.
4201 When set to "once" the network operation will
4202 fail when all the available network interfaces
4203 are tried once without success.
4204 Useful on scripts which control the retry operation
4205 themselves.
wdenkc6097192002-11-03 00:24:07 +00004206
Jean-Christophe PLAGNIOL-VILLARDb4e2f892009-01-31 09:53:39 +01004207 npe_ucode - set load address for the NPE microcode
Jean-Christophe PLAGNIOL-VILLARDa1cf0272008-01-07 08:41:34 +01004208
Wolfgang Denk28cb9372005-09-24 23:25:46 +02004209 tftpsrcport - If this is set, the value is used for TFTP's
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02004210 UDP source port.
4211
Wolfgang Denk28cb9372005-09-24 23:25:46 +02004212 tftpdstport - If this is set, the value is used for TFTP's UDP
4213 destination port instead of the Well Know Port 69.
4214
Wolfgang Denkc96f86e2010-01-17 23:55:53 +01004215 tftpblocksize - Block size to use for TFTP transfers; if not set,
4216 we use the TFTP server's default block size
4217
4218 tftptimeout - Retransmission timeout for TFTP packets (in milli-
4219 seconds, minimum value is 1000 = 1 second). Defines
4220 when a packet is considered to be lost so it has to
4221 be retransmitted. The default is 5000 = 5 seconds.
4222 Lowering this value may make downloads succeed
4223 faster in networks with high packet loss rates or
4224 with unreliable TFTP servers.
4225
4226 vlan - When set to a value < 4095 the traffic over
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004227 Ethernet is encapsulated/received over 802.1q
wdenk2729af92004-05-03 20:45:30 +00004228 VLAN tagged frames.
wdenka3d991b2004-04-15 21:48:45 +00004229
Jason Hobbsdc0b7b02011-08-31 05:37:28 +00004230The following image location variables contain the location of images
4231used in booting. The "Image" column gives the role of the image and is
4232not an environment variable name. The other columns are environment
4233variable names. "File Name" gives the name of the file on a TFTP
4234server, "RAM Address" gives the location in RAM the image will be
4235loaded to, and "Flash Location" gives the image's address in NOR
4236flash or offset in NAND flash.
4237
4238*Note* - these variables don't have to be defined for all boards, some
4239boards currenlty use other variables for these purposes, and some
4240boards use these variables for other purposes.
4241
Wolfgang Denkc0f40852011-10-26 10:21:21 +00004242Image File Name RAM Address Flash Location
4243----- --------- ----------- --------------
4244u-boot u-boot u-boot_addr_r u-boot_addr
4245Linux kernel bootfile kernel_addr_r kernel_addr
4246device tree blob fdtfile fdt_addr_r fdt_addr
4247ramdisk ramdiskfile ramdisk_addr_r ramdisk_addr
Jason Hobbsdc0b7b02011-08-31 05:37:28 +00004248
wdenk2729af92004-05-03 20:45:30 +00004249The following environment variables may be used and automatically
4250updated by the network boot commands ("bootp" and "rarpboot"),
4251depending the information provided by your boot server:
wdenka3d991b2004-04-15 21:48:45 +00004252
wdenk2729af92004-05-03 20:45:30 +00004253 bootfile - see above
4254 dnsip - IP address of your Domain Name Server
4255 dnsip2 - IP address of your secondary Domain Name Server
4256 gatewayip - IP address of the Gateway (Router) to use
4257 hostname - Target hostname
4258 ipaddr - see above
4259 netmask - Subnet Mask
4260 rootpath - Pathname of the root filesystem on the NFS server
4261 serverip - see above
wdenka3d991b2004-04-15 21:48:45 +00004262
wdenka3d991b2004-04-15 21:48:45 +00004263
wdenk2729af92004-05-03 20:45:30 +00004264There are two special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00004265
wdenk2729af92004-05-03 20:45:30 +00004266 serial# - contains hardware identification information such
4267 as type string and/or serial number
4268 ethaddr - Ethernet address
wdenkc6097192002-11-03 00:24:07 +00004269
wdenk2729af92004-05-03 20:45:30 +00004270These variables can be set only once (usually during manufacturing of
4271the board). U-Boot refuses to delete or overwrite these variables
4272once they have been set once.
wdenkc6097192002-11-03 00:24:07 +00004273
4274
wdenk2729af92004-05-03 20:45:30 +00004275Further special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00004276
wdenk2729af92004-05-03 20:45:30 +00004277 ver - Contains the U-Boot version string as printed
4278 with the "version" command. This variable is
4279 readonly (see CONFIG_VERSION_VARIABLE).
wdenkc6097192002-11-03 00:24:07 +00004280
wdenkc6097192002-11-03 00:24:07 +00004281
wdenk2729af92004-05-03 20:45:30 +00004282Please note that changes to some configuration parameters may take
4283only effect after the next boot (yes, that's just like Windoze :-).
wdenkc6097192002-11-03 00:24:07 +00004284
stroesec1551ea2003-04-04 15:53:41 +00004285
Joe Hershberger170ab112012-12-11 22:16:24 -06004286Callback functions for environment variables:
4287---------------------------------------------
4288
4289For some environment variables, the behavior of u-boot needs to change
4290when their values are changed. This functionailty allows functions to
4291be associated with arbitrary variables. On creation, overwrite, or
4292deletion, the callback will provide the opportunity for some side
4293effect to happen or for the change to be rejected.
4294
4295The callbacks are named and associated with a function using the
4296U_BOOT_ENV_CALLBACK macro in your board or driver code.
4297
4298These callbacks are associated with variables in one of two ways. The
4299static list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
4300in the board configuration to a string that defines a list of
4301associations. The list must be in the following format:
4302
4303 entry = variable_name[:callback_name]
4304 list = entry[,list]
4305
4306If the callback name is not specified, then the callback is deleted.
4307Spaces are also allowed anywhere in the list.
4308
4309Callbacks can also be associated by defining the ".callbacks" variable
4310with the same list format above. Any association in ".callbacks" will
4311override any association in the static list. You can define
4312CONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
4313".callbacks" envirnoment variable in the default or embedded environment.
4314
4315
wdenk2729af92004-05-03 20:45:30 +00004316Command Line Parsing:
4317=====================
stroesec1551ea2003-04-04 15:53:41 +00004318
wdenk2729af92004-05-03 20:45:30 +00004319There are two different command line parsers available with U-Boot:
4320the old "simple" one, and the much more powerful "hush" shell:
stroesec1551ea2003-04-04 15:53:41 +00004321
wdenk2729af92004-05-03 20:45:30 +00004322Old, simple command line parser:
4323--------------------------------
wdenkc6097192002-11-03 00:24:07 +00004324
wdenk2729af92004-05-03 20:45:30 +00004325- supports environment variables (through setenv / saveenv commands)
4326- several commands on one line, separated by ';'
Wolfgang Denkfe126d82005-11-20 21:40:11 +01004327- variable substitution using "... ${name} ..." syntax
wdenk2729af92004-05-03 20:45:30 +00004328- special characters ('$', ';') can be escaped by prefixing with '\',
4329 for example:
Wolfgang Denkfe126d82005-11-20 21:40:11 +01004330 setenv bootcmd bootm \${address}
wdenk2729af92004-05-03 20:45:30 +00004331- You can also escape text by enclosing in single apostrophes, for example:
4332 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
wdenkc6097192002-11-03 00:24:07 +00004333
wdenk2729af92004-05-03 20:45:30 +00004334Hush shell:
4335-----------
wdenkf07771c2003-05-28 08:06:31 +00004336
wdenk2729af92004-05-03 20:45:30 +00004337- similar to Bourne shell, with control structures like
4338 if...then...else...fi, for...do...done; while...do...done,
4339 until...do...done, ...
4340- supports environment ("global") variables (through setenv / saveenv
4341 commands) and local shell variables (through standard shell syntax
4342 "name=value"); only environment variables can be used with "run"
4343 command
wdenkf07771c2003-05-28 08:06:31 +00004344
wdenk2729af92004-05-03 20:45:30 +00004345General rules:
4346--------------
wdenkf07771c2003-05-28 08:06:31 +00004347
wdenk2729af92004-05-03 20:45:30 +00004348(1) If a command line (or an environment variable executed by a "run"
4349 command) contains several commands separated by semicolon, and
4350 one of these commands fails, then the remaining commands will be
4351 executed anyway.
wdenkf07771c2003-05-28 08:06:31 +00004352
wdenk2729af92004-05-03 20:45:30 +00004353(2) If you execute several variables with one call to run (i. e.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004354 calling run with a list of variables as arguments), any failing
wdenk2729af92004-05-03 20:45:30 +00004355 command will cause "run" to terminate, i. e. the remaining
4356 variables are not executed.
wdenkf07771c2003-05-28 08:06:31 +00004357
wdenk2729af92004-05-03 20:45:30 +00004358Note for Redundant Ethernet Interfaces:
4359=======================================
wdenkf07771c2003-05-28 08:06:31 +00004360
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004361Some boards come with redundant Ethernet interfaces; U-Boot supports
wdenk2729af92004-05-03 20:45:30 +00004362such configurations and is capable of automatic selection of a
4363"working" interface when needed. MAC assignment works as follows:
wdenkf07771c2003-05-28 08:06:31 +00004364
wdenk2729af92004-05-03 20:45:30 +00004365Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
4366MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4367"eth1addr" (=>eth1), "eth2addr", ...
wdenkf07771c2003-05-28 08:06:31 +00004368
wdenk2729af92004-05-03 20:45:30 +00004369If the network interface stores some valid MAC address (for instance
4370in SROM), this is used as default address if there is NO correspon-
4371ding setting in the environment; if the corresponding environment
4372variable is set, this overrides the settings in the card; that means:
wdenkf07771c2003-05-28 08:06:31 +00004373
wdenk2729af92004-05-03 20:45:30 +00004374o If the SROM has a valid MAC address, and there is no address in the
4375 environment, the SROM's address is used.
wdenkc6097192002-11-03 00:24:07 +00004376
wdenk2729af92004-05-03 20:45:30 +00004377o If there is no valid address in the SROM, and a definition in the
4378 environment exists, then the value from the environment variable is
4379 used.
wdenkc6097192002-11-03 00:24:07 +00004380
wdenk2729af92004-05-03 20:45:30 +00004381o If both the SROM and the environment contain a MAC address, and
4382 both addresses are the same, this MAC address is used.
wdenkc6097192002-11-03 00:24:07 +00004383
wdenk2729af92004-05-03 20:45:30 +00004384o If both the SROM and the environment contain a MAC address, and the
4385 addresses differ, the value from the environment is used and a
4386 warning is printed.
wdenkc6097192002-11-03 00:24:07 +00004387
wdenk2729af92004-05-03 20:45:30 +00004388o If neither SROM nor the environment contain a MAC address, an error
4389 is raised.
wdenkc6097192002-11-03 00:24:07 +00004390
Ben Warrenecee9322010-04-26 11:11:46 -07004391If Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
Wolfgang Denkc0f40852011-10-26 10:21:21 +00004392will be programmed into hardware as part of the initialization process. This
Ben Warrenecee9322010-04-26 11:11:46 -07004393may be skipped by setting the appropriate 'ethmacskip' environment variable.
4394The naming convention is as follows:
4395"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
wdenkc6097192002-11-03 00:24:07 +00004396
wdenk2729af92004-05-03 20:45:30 +00004397Image Formats:
4398==============
wdenkc6097192002-11-03 00:24:07 +00004399
Marian Balakowicz3310c542008-03-12 12:13:13 +01004400U-Boot is capable of booting (and performing other auxiliary operations on)
4401images in two formats:
4402
4403New uImage format (FIT)
4404-----------------------
4405
4406Flexible and powerful format based on Flattened Image Tree -- FIT (similar
4407to Flattened Device Tree). It allows the use of images with multiple
4408components (several kernels, ramdisks, etc.), with contents protected by
4409SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
4410
4411
4412Old uImage format
4413-----------------
4414
4415Old image format is based on binary files which can be basically anything,
4416preceded by a special header; see the definitions in include/image.h for
4417details; basically, the header defines the following image properties:
wdenkc6097192002-11-03 00:24:07 +00004418
wdenk2729af92004-05-03 20:45:30 +00004419* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4420 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
Peter Tyserf5ed9e32008-09-08 14:56:49 -05004421 LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4422 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4423 INTEGRITY).
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02004424* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
Macpaul Linafc1ce82011-10-19 20:41:11 +00004425 IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4426 Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
wdenk2729af92004-05-03 20:45:30 +00004427* Compression Type (uncompressed, gzip, bzip2)
4428* Load Address
4429* Entry Point
4430* Image Name
4431* Image Timestamp
wdenkc6097192002-11-03 00:24:07 +00004432
wdenk2729af92004-05-03 20:45:30 +00004433The header is marked by a special Magic Number, and both the header
4434and the data portions of the image are secured against corruption by
4435CRC32 checksums.
wdenkc6097192002-11-03 00:24:07 +00004436
wdenkc6097192002-11-03 00:24:07 +00004437
wdenk2729af92004-05-03 20:45:30 +00004438Linux Support:
4439==============
wdenkc6097192002-11-03 00:24:07 +00004440
wdenk2729af92004-05-03 20:45:30 +00004441Although U-Boot should support any OS or standalone application
4442easily, the main focus has always been on Linux during the design of
4443U-Boot.
wdenkc6097192002-11-03 00:24:07 +00004444
wdenk2729af92004-05-03 20:45:30 +00004445U-Boot includes many features that so far have been part of some
4446special "boot loader" code within the Linux kernel. Also, any
4447"initrd" images to be used are no longer part of one big Linux image;
4448instead, kernel and "initrd" are separate images. This implementation
4449serves several purposes:
wdenkc6097192002-11-03 00:24:07 +00004450
wdenk2729af92004-05-03 20:45:30 +00004451- the same features can be used for other OS or standalone
4452 applications (for instance: using compressed images to reduce the
4453 Flash memory footprint)
wdenkc6097192002-11-03 00:24:07 +00004454
wdenk2729af92004-05-03 20:45:30 +00004455- it becomes much easier to port new Linux kernel versions because
4456 lots of low-level, hardware dependent stuff are done by U-Boot
wdenkc6097192002-11-03 00:24:07 +00004457
wdenk2729af92004-05-03 20:45:30 +00004458- the same Linux kernel image can now be used with different "initrd"
4459 images; of course this also means that different kernel images can
4460 be run with the same "initrd". This makes testing easier (you don't
4461 have to build a new "zImage.initrd" Linux image when you just
4462 change a file in your "initrd"). Also, a field-upgrade of the
4463 software is easier now.
wdenkc6097192002-11-03 00:24:07 +00004464
wdenkc6097192002-11-03 00:24:07 +00004465
wdenk2729af92004-05-03 20:45:30 +00004466Linux HOWTO:
4467============
wdenkc6097192002-11-03 00:24:07 +00004468
wdenk2729af92004-05-03 20:45:30 +00004469Porting Linux to U-Boot based systems:
4470---------------------------------------
wdenkc6097192002-11-03 00:24:07 +00004471
wdenk2729af92004-05-03 20:45:30 +00004472U-Boot cannot save you from doing all the necessary modifications to
4473configure the Linux device drivers for use with your target hardware
4474(no, we don't intend to provide a full virtual machine interface to
4475Linux :-).
wdenkc6097192002-11-03 00:24:07 +00004476
Stefan Roesea47a12b2010-04-15 16:07:28 +02004477But now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
wdenkc6097192002-11-03 00:24:07 +00004478
wdenk2729af92004-05-03 20:45:30 +00004479Just make sure your machine specific header file (for instance
4480include/asm-ppc/tqm8xx.h) includes the same definition of the Board
Markus Heidelberg1dc30692008-09-07 20:18:27 +02004481Information structure as we define in include/asm-<arch>/u-boot.h,
4482and make sure that your definition of IMAP_ADDR uses the same value
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02004483as your U-Boot configuration in CONFIG_SYS_IMMR.
wdenkc6097192002-11-03 00:24:07 +00004484
wdenkc6097192002-11-03 00:24:07 +00004485
wdenk2729af92004-05-03 20:45:30 +00004486Configuring the Linux kernel:
4487-----------------------------
wdenkc6097192002-11-03 00:24:07 +00004488
wdenk2729af92004-05-03 20:45:30 +00004489No specific requirements for U-Boot. Make sure you have some root
4490device (initial ramdisk, NFS) for your target system.
wdenkc6097192002-11-03 00:24:07 +00004491
wdenkc6097192002-11-03 00:24:07 +00004492
wdenk2729af92004-05-03 20:45:30 +00004493Building a Linux Image:
4494-----------------------
wdenkc6097192002-11-03 00:24:07 +00004495
wdenk2729af92004-05-03 20:45:30 +00004496With U-Boot, "normal" build targets like "zImage" or "bzImage" are
4497not used. If you use recent kernel source, a new build target
4498"uImage" will exist which automatically builds an image usable by
4499U-Boot. Most older kernels also have support for a "pImage" target,
4500which was introduced for our predecessor project PPCBoot and uses a
4501100% compatible format.
wdenkc6097192002-11-03 00:24:07 +00004502
wdenk2729af92004-05-03 20:45:30 +00004503Example:
wdenkc6097192002-11-03 00:24:07 +00004504
wdenk2729af92004-05-03 20:45:30 +00004505 make TQM850L_config
4506 make oldconfig
4507 make dep
4508 make uImage
wdenkc6097192002-11-03 00:24:07 +00004509
wdenk2729af92004-05-03 20:45:30 +00004510The "uImage" build target uses a special tool (in 'tools/mkimage') to
4511encapsulate a compressed Linux kernel image with header information,
4512CRC32 checksum etc. for use with U-Boot. This is what we are doing:
wdenkc6097192002-11-03 00:24:07 +00004513
wdenk2729af92004-05-03 20:45:30 +00004514* build a standard "vmlinux" kernel image (in ELF binary format):
wdenkc6097192002-11-03 00:24:07 +00004515
wdenk2729af92004-05-03 20:45:30 +00004516* convert the kernel into a raw binary image:
wdenkc6097192002-11-03 00:24:07 +00004517
wdenk2729af92004-05-03 20:45:30 +00004518 ${CROSS_COMPILE}-objcopy -O binary \
4519 -R .note -R .comment \
4520 -S vmlinux linux.bin
wdenkc6097192002-11-03 00:24:07 +00004521
wdenk2729af92004-05-03 20:45:30 +00004522* compress the binary image:
wdenkc6097192002-11-03 00:24:07 +00004523
wdenk2729af92004-05-03 20:45:30 +00004524 gzip -9 linux.bin
wdenkc6097192002-11-03 00:24:07 +00004525
wdenk2729af92004-05-03 20:45:30 +00004526* package compressed binary image for U-Boot:
wdenk24ee89b2002-11-03 17:56:27 +00004527
wdenk2729af92004-05-03 20:45:30 +00004528 mkimage -A ppc -O linux -T kernel -C gzip \
4529 -a 0 -e 0 -n "Linux Kernel Image" \
4530 -d linux.bin.gz uImage
wdenk24ee89b2002-11-03 17:56:27 +00004531
wdenk24ee89b2002-11-03 17:56:27 +00004532
wdenk2729af92004-05-03 20:45:30 +00004533The "mkimage" tool can also be used to create ramdisk images for use
4534with U-Boot, either separated from the Linux kernel image, or
4535combined into one file. "mkimage" encapsulates the images with a 64
4536byte header containing information about target architecture,
4537operating system, image type, compression method, entry points, time
4538stamp, CRC32 checksums, etc.
wdenk24ee89b2002-11-03 17:56:27 +00004539
wdenk2729af92004-05-03 20:45:30 +00004540"mkimage" can be called in two ways: to verify existing images and
4541print the header information, or to build new images.
wdenk24ee89b2002-11-03 17:56:27 +00004542
wdenk2729af92004-05-03 20:45:30 +00004543In the first form (with "-l" option) mkimage lists the information
4544contained in the header of an existing U-Boot image; this includes
4545checksum verification:
wdenk24ee89b2002-11-03 17:56:27 +00004546
wdenk2729af92004-05-03 20:45:30 +00004547 tools/mkimage -l image
4548 -l ==> list image header information
wdenk24ee89b2002-11-03 17:56:27 +00004549
wdenk2729af92004-05-03 20:45:30 +00004550The second form (with "-d" option) is used to build a U-Boot image
4551from a "data file" which is used as image payload:
wdenk24ee89b2002-11-03 17:56:27 +00004552
wdenk2729af92004-05-03 20:45:30 +00004553 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
4554 -n name -d data_file image
4555 -A ==> set architecture to 'arch'
4556 -O ==> set operating system to 'os'
4557 -T ==> set image type to 'type'
4558 -C ==> set compression type 'comp'
4559 -a ==> set load address to 'addr' (hex)
4560 -e ==> set entry point to 'ep' (hex)
4561 -n ==> set image name to 'name'
4562 -d ==> use image data from 'datafile'
wdenk24ee89b2002-11-03 17:56:27 +00004563
wdenk69459792004-05-29 16:53:29 +00004564Right now, all Linux kernels for PowerPC systems use the same load
4565address (0x00000000), but the entry point address depends on the
4566kernel version:
wdenkc6097192002-11-03 00:24:07 +00004567
wdenk2729af92004-05-03 20:45:30 +00004568- 2.2.x kernels have the entry point at 0x0000000C,
4569- 2.3.x and later kernels have the entry point at 0x00000000.
wdenkc6097192002-11-03 00:24:07 +00004570
wdenk2729af92004-05-03 20:45:30 +00004571So a typical call to build a U-Boot image would read:
wdenkc6097192002-11-03 00:24:07 +00004572
wdenk2729af92004-05-03 20:45:30 +00004573 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
4574 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
Stefan Roesea47a12b2010-04-15 16:07:28 +02004575 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
wdenk2729af92004-05-03 20:45:30 +00004576 > examples/uImage.TQM850L
4577 Image Name: 2.4.4 kernel for TQM850L
4578 Created: Wed Jul 19 02:34:59 2000
4579 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4580 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
4581 Load Address: 0x00000000
4582 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00004583
wdenk2729af92004-05-03 20:45:30 +00004584To verify the contents of the image (or check for corruption):
wdenkc6097192002-11-03 00:24:07 +00004585
wdenk2729af92004-05-03 20:45:30 +00004586 -> tools/mkimage -l examples/uImage.TQM850L
4587 Image Name: 2.4.4 kernel for TQM850L
4588 Created: Wed Jul 19 02:34:59 2000
4589 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4590 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
4591 Load Address: 0x00000000
4592 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00004593
wdenk2729af92004-05-03 20:45:30 +00004594NOTE: for embedded systems where boot time is critical you can trade
4595speed for memory and install an UNCOMPRESSED image instead: this
4596needs more space in Flash, but boots much faster since it does not
4597need to be uncompressed:
wdenkc6097192002-11-03 00:24:07 +00004598
Stefan Roesea47a12b2010-04-15 16:07:28 +02004599 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
wdenk2729af92004-05-03 20:45:30 +00004600 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
4601 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
Stefan Roesea47a12b2010-04-15 16:07:28 +02004602 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
wdenk2729af92004-05-03 20:45:30 +00004603 > examples/uImage.TQM850L-uncompressed
4604 Image Name: 2.4.4 kernel for TQM850L
4605 Created: Wed Jul 19 02:34:59 2000
4606 Image Type: PowerPC Linux Kernel Image (uncompressed)
4607 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
4608 Load Address: 0x00000000
4609 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00004610
wdenkc6097192002-11-03 00:24:07 +00004611
wdenk2729af92004-05-03 20:45:30 +00004612Similar you can build U-Boot images from a 'ramdisk.image.gz' file
4613when your kernel is intended to use an initial ramdisk:
wdenkdb01a2e2004-04-15 23:14:49 +00004614
wdenk2729af92004-05-03 20:45:30 +00004615 -> tools/mkimage -n 'Simple Ramdisk Image' \
4616 > -A ppc -O linux -T ramdisk -C gzip \
4617 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
4618 Image Name: Simple Ramdisk Image
4619 Created: Wed Jan 12 14:01:50 2000
4620 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
4621 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
4622 Load Address: 0x00000000
4623 Entry Point: 0x00000000
wdenkdb01a2e2004-04-15 23:14:49 +00004624
wdenkdb01a2e2004-04-15 23:14:49 +00004625
wdenk2729af92004-05-03 20:45:30 +00004626Installing a Linux Image:
4627-------------------------
wdenkdb01a2e2004-04-15 23:14:49 +00004628
wdenk2729af92004-05-03 20:45:30 +00004629To downloading a U-Boot image over the serial (console) interface,
4630you must convert the image to S-Record format:
wdenkdb01a2e2004-04-15 23:14:49 +00004631
wdenk2729af92004-05-03 20:45:30 +00004632 objcopy -I binary -O srec examples/image examples/image.srec
wdenkdb01a2e2004-04-15 23:14:49 +00004633
wdenk2729af92004-05-03 20:45:30 +00004634The 'objcopy' does not understand the information in the U-Boot
4635image header, so the resulting S-Record file will be relative to
4636address 0x00000000. To load it to a given address, you need to
4637specify the target address as 'offset' parameter with the 'loads'
4638command.
wdenkc6097192002-11-03 00:24:07 +00004639
wdenk2729af92004-05-03 20:45:30 +00004640Example: install the image to address 0x40100000 (which on the
4641TQM8xxL is in the first Flash bank):
wdenkc6097192002-11-03 00:24:07 +00004642
wdenk2729af92004-05-03 20:45:30 +00004643 => erase 40100000 401FFFFF
wdenkc6097192002-11-03 00:24:07 +00004644
wdenk2729af92004-05-03 20:45:30 +00004645 .......... done
4646 Erased 8 sectors
wdenkc6097192002-11-03 00:24:07 +00004647
wdenk2729af92004-05-03 20:45:30 +00004648 => loads 40100000
4649 ## Ready for S-Record download ...
4650 ~>examples/image.srec
4651 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
4652 ...
4653 15989 15990 15991 15992
4654 [file transfer complete]
4655 [connected]
4656 ## Start Addr = 0x00000000
wdenkc6097192002-11-03 00:24:07 +00004657
4658
wdenk2729af92004-05-03 20:45:30 +00004659You can check the success of the download using the 'iminfo' command;
Wolfgang Denk218ca722008-03-26 10:40:12 +01004660this includes a checksum verification so you can be sure no data
wdenk2729af92004-05-03 20:45:30 +00004661corruption happened:
wdenkc6097192002-11-03 00:24:07 +00004662
wdenk2729af92004-05-03 20:45:30 +00004663 => imi 40100000
wdenkc6097192002-11-03 00:24:07 +00004664
wdenk2729af92004-05-03 20:45:30 +00004665 ## Checking Image at 40100000 ...
4666 Image Name: 2.2.13 for initrd on TQM850L
4667 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4668 Data Size: 335725 Bytes = 327 kB = 0 MB
4669 Load Address: 00000000
4670 Entry Point: 0000000c
4671 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00004672
4673
wdenk2729af92004-05-03 20:45:30 +00004674Boot Linux:
4675-----------
wdenkc6097192002-11-03 00:24:07 +00004676
wdenk2729af92004-05-03 20:45:30 +00004677The "bootm" command is used to boot an application that is stored in
4678memory (RAM or Flash). In case of a Linux kernel image, the contents
4679of the "bootargs" environment variable is passed to the kernel as
4680parameters. You can check and modify this variable using the
4681"printenv" and "setenv" commands:
wdenkc6097192002-11-03 00:24:07 +00004682
4683
wdenk2729af92004-05-03 20:45:30 +00004684 => printenv bootargs
4685 bootargs=root=/dev/ram
wdenkc6097192002-11-03 00:24:07 +00004686
wdenk2729af92004-05-03 20:45:30 +00004687 => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00004688
wdenk2729af92004-05-03 20:45:30 +00004689 => printenv bootargs
4690 bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
wdenkc6097192002-11-03 00:24:07 +00004691
wdenk2729af92004-05-03 20:45:30 +00004692 => bootm 40020000
4693 ## Booting Linux kernel at 40020000 ...
4694 Image Name: 2.2.13 for NFS on TQM850L
4695 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4696 Data Size: 381681 Bytes = 372 kB = 0 MB
4697 Load Address: 00000000
4698 Entry Point: 0000000c
4699 Verifying Checksum ... OK
4700 Uncompressing Kernel Image ... OK
4701 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:35:17 MEST 2000
4702 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4703 time_init: decrementer frequency = 187500000/60
4704 Calibrating delay loop... 49.77 BogoMIPS
4705 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
4706 ...
wdenkc6097192002-11-03 00:24:07 +00004707
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02004708If you want to boot a Linux kernel with initial RAM disk, you pass
wdenk2729af92004-05-03 20:45:30 +00004709the memory addresses of both the kernel and the initrd image (PPBCOOT
4710format!) to the "bootm" command:
wdenkc6097192002-11-03 00:24:07 +00004711
wdenk2729af92004-05-03 20:45:30 +00004712 => imi 40100000 40200000
wdenkc6097192002-11-03 00:24:07 +00004713
wdenk2729af92004-05-03 20:45:30 +00004714 ## Checking Image at 40100000 ...
4715 Image Name: 2.2.13 for initrd on TQM850L
4716 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4717 Data Size: 335725 Bytes = 327 kB = 0 MB
4718 Load Address: 00000000
4719 Entry Point: 0000000c
4720 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00004721
wdenk2729af92004-05-03 20:45:30 +00004722 ## Checking Image at 40200000 ...
4723 Image Name: Simple Ramdisk Image
4724 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
4725 Data Size: 566530 Bytes = 553 kB = 0 MB
4726 Load Address: 00000000
4727 Entry Point: 00000000
4728 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00004729
wdenk2729af92004-05-03 20:45:30 +00004730 => bootm 40100000 40200000
4731 ## Booting Linux kernel at 40100000 ...
4732 Image Name: 2.2.13 for initrd on TQM850L
4733 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4734 Data Size: 335725 Bytes = 327 kB = 0 MB
4735 Load Address: 00000000
4736 Entry Point: 0000000c
4737 Verifying Checksum ... OK
4738 Uncompressing Kernel Image ... OK
4739 ## Loading RAMDisk Image at 40200000 ...
4740 Image Name: Simple Ramdisk Image
4741 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
4742 Data Size: 566530 Bytes = 553 kB = 0 MB
4743 Load Address: 00000000
4744 Entry Point: 00000000
4745 Verifying Checksum ... OK
4746 Loading Ramdisk ... OK
4747 Linux version 2.2.13 (wd@denx.local.net) (gcc version 2.95.2 19991024 (release)) #1 Wed Jul 19 02:32:08 MEST 2000
4748 Boot arguments: root=/dev/ram
4749 time_init: decrementer frequency = 187500000/60
4750 Calibrating delay loop... 49.77 BogoMIPS
4751 ...
4752 RAMDISK: Compressed image found at block 0
4753 VFS: Mounted root (ext2 filesystem).
wdenkc6097192002-11-03 00:24:07 +00004754
wdenk2729af92004-05-03 20:45:30 +00004755 bash#
wdenkc6097192002-11-03 00:24:07 +00004756
Matthew McClintock02677682006-06-28 10:41:37 -05004757Boot Linux and pass a flat device tree:
4758-----------
4759
4760First, U-Boot must be compiled with the appropriate defines. See the section
4761titled "Linux Kernel Interface" above for a more in depth explanation. The
4762following is an example of how to start a kernel and pass an updated
4763flat device tree:
4764
4765=> print oftaddr
4766oftaddr=0x300000
4767=> print oft
4768oft=oftrees/mpc8540ads.dtb
4769=> tftp $oftaddr $oft
4770Speed: 1000, full duplex
4771Using TSEC0 device
4772TFTP from server 192.168.1.1; our IP address is 192.168.1.101
4773Filename 'oftrees/mpc8540ads.dtb'.
4774Load address: 0x300000
4775Loading: #
4776done
4777Bytes transferred = 4106 (100a hex)
4778=> tftp $loadaddr $bootfile
4779Speed: 1000, full duplex
4780Using TSEC0 device
4781TFTP from server 192.168.1.1; our IP address is 192.168.1.2
4782Filename 'uImage'.
4783Load address: 0x200000
4784Loading:############
4785done
4786Bytes transferred = 1029407 (fb51f hex)
4787=> print loadaddr
4788loadaddr=200000
4789=> print oftaddr
4790oftaddr=0x300000
4791=> bootm $loadaddr - $oftaddr
4792## Booting image at 00200000 ...
Wolfgang Denka9398e02006-11-27 15:32:42 +01004793 Image Name: Linux-2.6.17-dirty
4794 Image Type: PowerPC Linux Kernel Image (gzip compressed)
4795 Data Size: 1029343 Bytes = 1005.2 kB
Matthew McClintock02677682006-06-28 10:41:37 -05004796 Load Address: 00000000
Wolfgang Denka9398e02006-11-27 15:32:42 +01004797 Entry Point: 00000000
Matthew McClintock02677682006-06-28 10:41:37 -05004798 Verifying Checksum ... OK
4799 Uncompressing Kernel Image ... OK
4800Booting using flat device tree at 0x300000
4801Using MPC85xx ADS machine description
4802Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
4803[snip]
4804
4805
wdenk2729af92004-05-03 20:45:30 +00004806More About U-Boot Image Types:
4807------------------------------
wdenk6069ff22003-02-28 00:49:47 +00004808
wdenk2729af92004-05-03 20:45:30 +00004809U-Boot supports the following image types:
wdenk6069ff22003-02-28 00:49:47 +00004810
wdenk2729af92004-05-03 20:45:30 +00004811 "Standalone Programs" are directly runnable in the environment
4812 provided by U-Boot; it is expected that (if they behave
4813 well) you can continue to work in U-Boot after return from
4814 the Standalone Program.
4815 "OS Kernel Images" are usually images of some Embedded OS which
4816 will take over control completely. Usually these programs
4817 will install their own set of exception handlers, device
4818 drivers, set up the MMU, etc. - this means, that you cannot
4819 expect to re-enter U-Boot except by resetting the CPU.
4820 "RAMDisk Images" are more or less just data blocks, and their
4821 parameters (address, size) are passed to an OS kernel that is
4822 being started.
4823 "Multi-File Images" contain several images, typically an OS
4824 (Linux) kernel image and one or more data images like
4825 RAMDisks. This construct is useful for instance when you want
4826 to boot over the network using BOOTP etc., where the boot
4827 server provides just a single image file, but you want to get
4828 for instance an OS kernel and a RAMDisk image.
stroesec1551ea2003-04-04 15:53:41 +00004829
wdenk2729af92004-05-03 20:45:30 +00004830 "Multi-File Images" start with a list of image sizes, each
4831 image size (in bytes) specified by an "uint32_t" in network
4832 byte order. This list is terminated by an "(uint32_t)0".
4833 Immediately after the terminating 0 follow the images, one by
4834 one, all aligned on "uint32_t" boundaries (size rounded up to
4835 a multiple of 4 bytes).
stroesec1551ea2003-04-04 15:53:41 +00004836
wdenk2729af92004-05-03 20:45:30 +00004837 "Firmware Images" are binary images containing firmware (like
4838 U-Boot or FPGA images) which usually will be programmed to
4839 flash memory.
stroesec1551ea2003-04-04 15:53:41 +00004840
wdenk2729af92004-05-03 20:45:30 +00004841 "Script files" are command sequences that will be executed by
4842 U-Boot's command interpreter; this feature is especially
4843 useful when you configure U-Boot to use a real shell (hush)
4844 as command interpreter.
wdenk6069ff22003-02-28 00:49:47 +00004845
Marek Vasut44f074c2012-03-14 21:52:45 +00004846Booting the Linux zImage:
4847-------------------------
4848
4849On some platforms, it's possible to boot Linux zImage. This is done
4850using the "bootz" command. The syntax of "bootz" command is the same
4851as the syntax of "bootm" command.
4852
Marek Vasut017e1f32012-03-18 11:47:58 +00004853Note, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply
4854kernel with raw initrd images. The syntax is slightly different, the
4855address of the initrd must be augmented by it's size, in the following
4856format: "<initrd addres>:<initrd size>".
4857
wdenkc6097192002-11-03 00:24:07 +00004858
wdenk2729af92004-05-03 20:45:30 +00004859Standalone HOWTO:
4860=================
wdenkc6097192002-11-03 00:24:07 +00004861
wdenk2729af92004-05-03 20:45:30 +00004862One of the features of U-Boot is that you can dynamically load and
4863run "standalone" applications, which can use some resources of
4864U-Boot like console I/O functions or interrupt services.
wdenkc6097192002-11-03 00:24:07 +00004865
wdenk2729af92004-05-03 20:45:30 +00004866Two simple examples are included with the sources:
wdenkc6097192002-11-03 00:24:07 +00004867
wdenk2729af92004-05-03 20:45:30 +00004868"Hello World" Demo:
4869-------------------
wdenkc6097192002-11-03 00:24:07 +00004870
wdenk2729af92004-05-03 20:45:30 +00004871'examples/hello_world.c' contains a small "Hello World" Demo
4872application; it is automatically compiled when you build U-Boot.
4873It's configured to run at address 0x00040004, so you can play with it
4874like that:
wdenkc6097192002-11-03 00:24:07 +00004875
wdenk2729af92004-05-03 20:45:30 +00004876 => loads
4877 ## Ready for S-Record download ...
4878 ~>examples/hello_world.srec
4879 1 2 3 4 5 6 7 8 9 10 11 ...
4880 [file transfer complete]
4881 [connected]
4882 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00004883
wdenk2729af92004-05-03 20:45:30 +00004884 => go 40004 Hello World! This is a test.
4885 ## Starting application at 0x00040004 ...
4886 Hello World
4887 argc = 7
4888 argv[0] = "40004"
4889 argv[1] = "Hello"
4890 argv[2] = "World!"
4891 argv[3] = "This"
4892 argv[4] = "is"
4893 argv[5] = "a"
4894 argv[6] = "test."
4895 argv[7] = "<NULL>"
4896 Hit any key to exit ...
wdenkc6097192002-11-03 00:24:07 +00004897
wdenk2729af92004-05-03 20:45:30 +00004898 ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00004899
wdenk2729af92004-05-03 20:45:30 +00004900Another example, which demonstrates how to register a CPM interrupt
4901handler with the U-Boot code, can be found in 'examples/timer.c'.
4902Here, a CPM timer is set up to generate an interrupt every second.
4903The interrupt service routine is trivial, just printing a '.'
4904character, but this is just a demo program. The application can be
4905controlled by the following keys:
wdenkc6097192002-11-03 00:24:07 +00004906
wdenk2729af92004-05-03 20:45:30 +00004907 ? - print current values og the CPM Timer registers
4908 b - enable interrupts and start timer
4909 e - stop timer and disable interrupts
4910 q - quit application
wdenkc6097192002-11-03 00:24:07 +00004911
wdenk2729af92004-05-03 20:45:30 +00004912 => loads
4913 ## Ready for S-Record download ...
4914 ~>examples/timer.srec
4915 1 2 3 4 5 6 7 8 9 10 11 ...
4916 [file transfer complete]
4917 [connected]
4918 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00004919
wdenk2729af92004-05-03 20:45:30 +00004920 => go 40004
4921 ## Starting application at 0x00040004 ...
4922 TIMERS=0xfff00980
4923 Using timer 1
4924 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
wdenkc6097192002-11-03 00:24:07 +00004925
wdenk2729af92004-05-03 20:45:30 +00004926Hit 'b':
4927 [q, b, e, ?] Set interval 1000000 us
4928 Enabling timer
4929Hit '?':
4930 [q, b, e, ?] ........
4931 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4932Hit '?':
4933 [q, b, e, ?] .
4934 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4935Hit '?':
4936 [q, b, e, ?] .
4937 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4938Hit '?':
4939 [q, b, e, ?] .
4940 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4941Hit 'e':
4942 [q, b, e, ?] ...Stopping timer
4943Hit 'q':
4944 [q, b, e, ?] ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00004945
4946
wdenk2729af92004-05-03 20:45:30 +00004947Minicom warning:
4948================
wdenk85ec0bc2003-03-31 16:34:49 +00004949
wdenk2729af92004-05-03 20:45:30 +00004950Over time, many people have reported problems when trying to use the
4951"minicom" terminal emulation program for serial download. I (wd)
4952consider minicom to be broken, and recommend not to use it. Under
4953Unix, I recommend to use C-Kermit for general purpose use (and
4954especially for kermit binary protocol download ("loadb" command), and
Karl O. Pince53515a2012-10-01 05:11:56 +00004955use "cu" for S-Record download ("loads" command). See
4956http://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
4957for help with kermit.
4958
wdenk85ec0bc2003-03-31 16:34:49 +00004959
wdenk2729af92004-05-03 20:45:30 +00004960Nevertheless, if you absolutely want to use it try adding this
4961configuration to your "File transfer protocols" section:
wdenk52f52c12003-06-19 23:04:19 +00004962
wdenk2729af92004-05-03 20:45:30 +00004963 Name Program Name U/D FullScr IO-Red. Multi
4964 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
4965 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
wdenk52f52c12003-06-19 23:04:19 +00004966
4967
wdenk2729af92004-05-03 20:45:30 +00004968NetBSD Notes:
4969=============
wdenkc6097192002-11-03 00:24:07 +00004970
wdenk2729af92004-05-03 20:45:30 +00004971Starting at version 0.9.2, U-Boot supports NetBSD both as host
4972(build U-Boot) and target system (boots NetBSD/mpc8xx).
wdenkc6097192002-11-03 00:24:07 +00004973
wdenk2729af92004-05-03 20:45:30 +00004974Building requires a cross environment; it is known to work on
4975NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4976need gmake since the Makefiles are not compatible with BSD make).
4977Note that the cross-powerpc package does not install include files;
4978attempting to build U-Boot will fail because <machine/ansi.h> is
4979missing. This file has to be installed and patched manually:
wdenkc6097192002-11-03 00:24:07 +00004980
wdenk2729af92004-05-03 20:45:30 +00004981 # cd /usr/pkg/cross/powerpc-netbsd/include
4982 # mkdir powerpc
4983 # ln -s powerpc machine
4984 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4985 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
wdenkc6097192002-11-03 00:24:07 +00004986
wdenk2729af92004-05-03 20:45:30 +00004987Native builds *don't* work due to incompatibilities between native
4988and U-Boot include files.
wdenkc6097192002-11-03 00:24:07 +00004989
wdenk2729af92004-05-03 20:45:30 +00004990Booting assumes that (the first part of) the image booted is a
4991stage-2 loader which in turn loads and then invokes the kernel
4992proper. Loader sources will eventually appear in the NetBSD source
4993tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
wdenk2a8af182005-04-13 10:02:42 +00004994meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
wdenkc6097192002-11-03 00:24:07 +00004995
4996
wdenk2729af92004-05-03 20:45:30 +00004997Implementation Internals:
4998=========================
wdenkc6097192002-11-03 00:24:07 +00004999
wdenk2729af92004-05-03 20:45:30 +00005000The following is not intended to be a complete description of every
5001implementation detail. However, it should help to understand the
5002inner workings of U-Boot and make it easier to port it to custom
5003hardware.
wdenkc6097192002-11-03 00:24:07 +00005004
5005
wdenk2729af92004-05-03 20:45:30 +00005006Initial Stack, Global Data:
5007---------------------------
wdenkc6097192002-11-03 00:24:07 +00005008
wdenk2729af92004-05-03 20:45:30 +00005009The implementation of U-Boot is complicated by the fact that U-Boot
5010starts running out of ROM (flash memory), usually without access to
5011system RAM (because the memory controller is not initialized yet).
5012This means that we don't have writable Data or BSS segments, and BSS
5013is not initialized as zero. To be able to get a C environment working
5014at all, we have to allocate at least a minimal stack. Implementation
5015options for this are defined and restricted by the CPU used: Some CPU
5016models provide on-chip memory (like the IMMR area on MPC8xx and
5017MPC826x processors), on others (parts of) the data cache can be
5018locked as (mis-) used as memory, etc.
wdenkc6097192002-11-03 00:24:07 +00005019
Wolfgang Denk218ca722008-03-26 10:40:12 +01005020 Chris Hallinan posted a good summary of these issues to the
Wolfgang Denk06682362008-12-30 22:56:11 +01005021 U-Boot mailing list:
wdenk43d96162003-03-06 00:02:04 +00005022
wdenk2729af92004-05-03 20:45:30 +00005023 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
5024 From: "Chris Hallinan" <clh@net1plus.com>
5025 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
5026 ...
wdenk43d96162003-03-06 00:02:04 +00005027
wdenk2729af92004-05-03 20:45:30 +00005028 Correct me if I'm wrong, folks, but the way I understand it
5029 is this: Using DCACHE as initial RAM for Stack, etc, does not
5030 require any physical RAM backing up the cache. The cleverness
5031 is that the cache is being used as a temporary supply of
5032 necessary storage before the SDRAM controller is setup. It's
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02005033 beyond the scope of this list to explain the details, but you
wdenk2729af92004-05-03 20:45:30 +00005034 can see how this works by studying the cache architecture and
5035 operation in the architecture and processor-specific manuals.
wdenk43d96162003-03-06 00:02:04 +00005036
wdenk2729af92004-05-03 20:45:30 +00005037 OCM is On Chip Memory, which I believe the 405GP has 4K. It
5038 is another option for the system designer to use as an
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02005039 initial stack/RAM area prior to SDRAM being available. Either
wdenk2729af92004-05-03 20:45:30 +00005040 option should work for you. Using CS 4 should be fine if your
5041 board designers haven't used it for something that would
5042 cause you grief during the initial boot! It is frequently not
5043 used.
wdenk43d96162003-03-06 00:02:04 +00005044
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02005045 CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
wdenk2729af92004-05-03 20:45:30 +00005046 with your processor/board/system design. The default value
5047 you will find in any recent u-boot distribution in
Stefan Roese8a316c92005-08-01 16:49:12 +02005048 walnut.h should work for you. I'd set it to a value larger
wdenk2729af92004-05-03 20:45:30 +00005049 than your SDRAM module. If you have a 64MB SDRAM module, set
5050 it above 400_0000. Just make sure your board has no resources
5051 that are supposed to respond to that address! That code in
5052 start.S has been around a while and should work as is when
5053 you get the config right.
wdenk43d96162003-03-06 00:02:04 +00005054
wdenk2729af92004-05-03 20:45:30 +00005055 -Chris Hallinan
5056 DS4.COM, Inc.
wdenk43d96162003-03-06 00:02:04 +00005057
wdenk2729af92004-05-03 20:45:30 +00005058It is essential to remember this, since it has some impact on the C
5059code for the initialization procedures:
wdenkc6097192002-11-03 00:24:07 +00005060
wdenk2729af92004-05-03 20:45:30 +00005061* Initialized global data (data segment) is read-only. Do not attempt
5062 to write it.
wdenkc6097192002-11-03 00:24:07 +00005063
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02005064* Do not use any uninitialized global data (or implicitely initialized
wdenk2729af92004-05-03 20:45:30 +00005065 as zero data - BSS segment) at all - this is undefined, initiali-
5066 zation is performed later (when relocating to RAM).
wdenkc6097192002-11-03 00:24:07 +00005067
wdenk2729af92004-05-03 20:45:30 +00005068* Stack space is very limited. Avoid big data buffers or things like
5069 that.
wdenkc6097192002-11-03 00:24:07 +00005070
wdenk2729af92004-05-03 20:45:30 +00005071Having only the stack as writable memory limits means we cannot use
5072normal global data to share information beween the code. But it
5073turned out that the implementation of U-Boot can be greatly
5074simplified by making a global data structure (gd_t) available to all
5075functions. We could pass a pointer to this data as argument to _all_
5076functions, but this would bloat the code. Instead we use a feature of
5077the GCC compiler (Global Register Variables) to share the data: we
5078place a pointer (gd) to the global data into a register which we
5079reserve for this purpose.
wdenkc6097192002-11-03 00:24:07 +00005080
wdenk2729af92004-05-03 20:45:30 +00005081When choosing a register for such a purpose we are restricted by the
5082relevant (E)ABI specifications for the current architecture, and by
5083GCC's implementation.
wdenkc6097192002-11-03 00:24:07 +00005084
wdenk2729af92004-05-03 20:45:30 +00005085For PowerPC, the following registers have specific use:
5086 R1: stack pointer
Wolfgang Denke7670f62008-02-14 22:43:22 +01005087 R2: reserved for system use
wdenk2729af92004-05-03 20:45:30 +00005088 R3-R4: parameter passing and return values
5089 R5-R10: parameter passing
5090 R13: small data area pointer
5091 R30: GOT pointer
5092 R31: frame pointer
wdenkc6097192002-11-03 00:24:07 +00005093
Joakim Tjernlunde6bee802010-01-19 14:41:58 +01005094 (U-Boot also uses R12 as internal GOT pointer. r12
5095 is a volatile register so r12 needs to be reset when
5096 going back and forth between asm and C)
wdenkc6097192002-11-03 00:24:07 +00005097
Wolfgang Denke7670f62008-02-14 22:43:22 +01005098 ==> U-Boot will use R2 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00005099
wdenk2729af92004-05-03 20:45:30 +00005100 Note: on PPC, we could use a static initializer (since the
5101 address of the global data structure is known at compile time),
5102 but it turned out that reserving a register results in somewhat
5103 smaller code - although the code savings are not that big (on
5104 average for all boards 752 bytes for the whole U-Boot image,
5105 624 text + 127 data).
wdenkc6097192002-11-03 00:24:07 +00005106
Robin Getzc4db3352009-08-17 15:23:02 +00005107On Blackfin, the normal C ABI (except for P3) is followed as documented here:
Mike Frysinger4c58eb52008-02-04 19:26:54 -05005108 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
5109
Robin Getzc4db3352009-08-17 15:23:02 +00005110 ==> U-Boot will use P3 to hold a pointer to the global data
Mike Frysinger4c58eb52008-02-04 19:26:54 -05005111
wdenk2729af92004-05-03 20:45:30 +00005112On ARM, the following registers are used:
wdenkc6097192002-11-03 00:24:07 +00005113
wdenk2729af92004-05-03 20:45:30 +00005114 R0: function argument word/integer result
5115 R1-R3: function argument word
5116 R9: GOT pointer
5117 R10: stack limit (used only if stack checking if enabled)
5118 R11: argument (frame) pointer
5119 R12: temporary workspace
5120 R13: stack pointer
5121 R14: link register
5122 R15: program counter
wdenkc6097192002-11-03 00:24:07 +00005123
wdenk2729af92004-05-03 20:45:30 +00005124 ==> U-Boot will use R8 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00005125
Thomas Chou0df01fd2010-05-21 11:08:03 +08005126On Nios II, the ABI is documented here:
5127 http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
5128
5129 ==> U-Boot will use gp to hold a pointer to the global data
5130
5131 Note: on Nios II, we give "-G0" option to gcc and don't use gp
5132 to access small data sections, so gp is free.
5133
Macpaul Linafc1ce82011-10-19 20:41:11 +00005134On NDS32, the following registers are used:
5135
5136 R0-R1: argument/return
5137 R2-R5: argument
5138 R15: temporary register for assembler
5139 R16: trampoline register
5140 R28: frame pointer (FP)
5141 R29: global pointer (GP)
5142 R30: link register (LP)
5143 R31: stack pointer (SP)
5144 PC: program counter (PC)
5145
5146 ==> U-Boot will use R10 to hold a pointer to the global data
5147
Wolfgang Denkd87080b2006-03-31 18:32:53 +02005148NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5149or current versions of GCC may "optimize" the code too much.
wdenkc6097192002-11-03 00:24:07 +00005150
wdenk2729af92004-05-03 20:45:30 +00005151Memory Management:
5152------------------
wdenkc6097192002-11-03 00:24:07 +00005153
wdenk2729af92004-05-03 20:45:30 +00005154U-Boot runs in system state and uses physical addresses, i.e. the
5155MMU is not used either for address mapping nor for memory protection.
wdenkc6097192002-11-03 00:24:07 +00005156
wdenk2729af92004-05-03 20:45:30 +00005157The available memory is mapped to fixed addresses using the memory
5158controller. In this process, a contiguous block is formed for each
5159memory type (Flash, SDRAM, SRAM), even when it consists of several
5160physical memory banks.
wdenkc6097192002-11-03 00:24:07 +00005161
wdenk2729af92004-05-03 20:45:30 +00005162U-Boot is installed in the first 128 kB of the first Flash bank (on
5163TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5164booting and sizing and initializing DRAM, the code relocates itself
5165to the upper end of DRAM. Immediately below the U-Boot code some
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02005166memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
wdenk2729af92004-05-03 20:45:30 +00005167configuration setting]. Below that, a structure with global Board
5168Info data is placed, followed by the stack (growing downward).
wdenkc6097192002-11-03 00:24:07 +00005169
wdenk2729af92004-05-03 20:45:30 +00005170Additionally, some exception handler code is copied to the low 8 kB
5171of DRAM (0x00000000 ... 0x00001FFF).
wdenkc6097192002-11-03 00:24:07 +00005172
wdenk2729af92004-05-03 20:45:30 +00005173So a typical memory configuration with 16 MB of DRAM could look like
5174this:
wdenkc6097192002-11-03 00:24:07 +00005175
wdenk2729af92004-05-03 20:45:30 +00005176 0x0000 0000 Exception Vector code
5177 :
5178 0x0000 1FFF
5179 0x0000 2000 Free for Application Use
5180 :
5181 :
wdenkc6097192002-11-03 00:24:07 +00005182
wdenk2729af92004-05-03 20:45:30 +00005183 :
5184 :
5185 0x00FB FF20 Monitor Stack (Growing downward)
5186 0x00FB FFAC Board Info Data and permanent copy of global data
5187 0x00FC 0000 Malloc Arena
5188 :
5189 0x00FD FFFF
5190 0x00FE 0000 RAM Copy of Monitor Code
5191 ... eventually: LCD or video framebuffer
5192 ... eventually: pRAM (Protected RAM - unchanged by reset)
5193 0x00FF FFFF [End of RAM]
wdenkc6097192002-11-03 00:24:07 +00005194
5195
wdenk2729af92004-05-03 20:45:30 +00005196System Initialization:
5197----------------------
wdenkc6097192002-11-03 00:24:07 +00005198
wdenk2729af92004-05-03 20:45:30 +00005199In the reset configuration, U-Boot starts at the reset entry point
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02005200(on most PowerPC systems at address 0x00000100). Because of the reset
wdenk2729af92004-05-03 20:45:30 +00005201configuration for CS0# this is a mirror of the onboard Flash memory.
5202To be able to re-map memory U-Boot then jumps to its link address.
5203To be able to implement the initialization code in C, a (small!)
5204initial stack is set up in the internal Dual Ported RAM (in case CPUs
5205which provide such a feature like MPC8xx or MPC8260), or in a locked
5206part of the data cache. After that, U-Boot initializes the CPU core,
5207the caches and the SIU.
wdenkc6097192002-11-03 00:24:07 +00005208
wdenk2729af92004-05-03 20:45:30 +00005209Next, all (potentially) available memory banks are mapped using a
5210preliminary mapping. For example, we put them on 512 MB boundaries
5211(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5212on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5213programmed for SDRAM access. Using the temporary configuration, a
5214simple memory test is run that determines the size of the SDRAM
5215banks.
wdenkc6097192002-11-03 00:24:07 +00005216
wdenk2729af92004-05-03 20:45:30 +00005217When there is more than one SDRAM bank, and the banks are of
5218different size, the largest is mapped first. For equal size, the first
5219bank (CS2#) is mapped first. The first mapping is always for address
52200x00000000, with any additional banks following immediately to create
5221contiguous memory starting from 0.
wdenkc6097192002-11-03 00:24:07 +00005222
wdenk2729af92004-05-03 20:45:30 +00005223Then, the monitor installs itself at the upper end of the SDRAM area
5224and allocates memory for use by malloc() and for the global Board
5225Info data; also, the exception vector code is copied to the low RAM
5226pages, and the final stack is set up.
wdenkc6097192002-11-03 00:24:07 +00005227
wdenk2729af92004-05-03 20:45:30 +00005228Only after this relocation will you have a "normal" C environment;
5229until that you are restricted in several ways, mostly because you are
5230running from ROM, and because the code will have to be relocated to a
5231new address in RAM.
wdenkc6097192002-11-03 00:24:07 +00005232
5233
wdenk2729af92004-05-03 20:45:30 +00005234U-Boot Porting Guide:
5235----------------------
wdenkc6097192002-11-03 00:24:07 +00005236
wdenk2729af92004-05-03 20:45:30 +00005237[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
5238list, October 2002]
wdenkc6097192002-11-03 00:24:07 +00005239
5240
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005241int main(int argc, char *argv[])
wdenk2729af92004-05-03 20:45:30 +00005242{
5243 sighandler_t no_more_time;
wdenkc6097192002-11-03 00:24:07 +00005244
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005245 signal(SIGALRM, no_more_time);
5246 alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
wdenkc6097192002-11-03 00:24:07 +00005247
wdenk2729af92004-05-03 20:45:30 +00005248 if (available_money > available_manpower) {
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005249 Pay consultant to port U-Boot;
wdenkc6097192002-11-03 00:24:07 +00005250 return 0;
5251 }
5252
wdenk2729af92004-05-03 20:45:30 +00005253 Download latest U-Boot source;
5254
Wolfgang Denk06682362008-12-30 22:56:11 +01005255 Subscribe to u-boot mailing list;
wdenk2729af92004-05-03 20:45:30 +00005256
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005257 if (clueless)
5258 email("Hi, I am new to U-Boot, how do I get started?");
wdenkc6097192002-11-03 00:24:07 +00005259
wdenk2729af92004-05-03 20:45:30 +00005260 while (learning) {
5261 Read the README file in the top level directory;
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005262 Read http://www.denx.de/twiki/bin/view/DULG/Manual;
5263 Read applicable doc/*.README;
wdenk2729af92004-05-03 20:45:30 +00005264 Read the source, Luke;
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005265 /* find . -name "*.[chS]" | xargs grep -i <keyword> */
wdenk2729af92004-05-03 20:45:30 +00005266 }
wdenkc6097192002-11-03 00:24:07 +00005267
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005268 if (available_money > toLocalCurrency ($2500))
5269 Buy a BDI3000;
5270 else
wdenk2729af92004-05-03 20:45:30 +00005271 Add a lot of aggravation and time;
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005272
5273 if (a similar board exists) { /* hopefully... */
5274 cp -a board/<similar> board/<myboard>
5275 cp include/configs/<similar>.h include/configs/<myboard>.h
5276 } else {
5277 Create your own board support subdirectory;
5278 Create your own board include/configs/<myboard>.h file;
wdenk2729af92004-05-03 20:45:30 +00005279 }
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005280 Edit new board/<myboard> files
5281 Edit new include/configs/<myboard>.h
wdenkc6097192002-11-03 00:24:07 +00005282
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04005283 while (!accepted) {
5284 while (!running) {
5285 do {
5286 Add / modify source code;
5287 } until (compiles);
5288 Debug;
5289 if (clueless)
5290 email("Hi, I am having problems...");
5291 }
5292 Send patch file to the U-Boot email list;
5293 if (reasonable critiques)
5294 Incorporate improvements from email list code review;
5295 else
5296 Defend code as written;
wdenk2729af92004-05-03 20:45:30 +00005297 }
wdenkc6097192002-11-03 00:24:07 +00005298
wdenk2729af92004-05-03 20:45:30 +00005299 return 0;
5300}
5301
5302void no_more_time (int sig)
5303{
5304 hire_a_guru();
5305}
wdenkc6097192002-11-03 00:24:07 +00005306
5307
wdenk2729af92004-05-03 20:45:30 +00005308Coding Standards:
5309-----------------
wdenkc6097192002-11-03 00:24:07 +00005310
wdenk2729af92004-05-03 20:45:30 +00005311All contributions to U-Boot should conform to the Linux kernel
Detlev Zundel2c051652006-09-01 15:39:02 +02005312coding style; see the file "Documentation/CodingStyle" and the script
Wolfgang Denk7ca92962011-07-27 10:59:55 +00005313"scripts/Lindent" in your Linux kernel source directory.
wdenk2729af92004-05-03 20:45:30 +00005314
Detlev Zundel2c051652006-09-01 15:39:02 +02005315Source files originating from a different project (for example the
5316MTD subsystem) are generally exempt from these guidelines and are not
5317reformated to ease subsequent migration to newer versions of those
5318sources.
5319
5320Please note that U-Boot is implemented in C (and to some small parts in
5321Assembler); no C++ is used, so please do not use C++ style comments (//)
5322in your code.
wdenk2729af92004-05-03 20:45:30 +00005323
5324Please also stick to the following formatting rules:
5325- remove any trailing white space
Wolfgang Denk7ca92962011-07-27 10:59:55 +00005326- use TAB characters for indentation and vertical alignment, not spaces
wdenk2729af92004-05-03 20:45:30 +00005327- make sure NOT to use DOS '\r\n' line feeds
Wolfgang Denk7ca92962011-07-27 10:59:55 +00005328- do not add more than 2 consecutive empty lines to source files
wdenk2729af92004-05-03 20:45:30 +00005329- do not add trailing empty lines to source files
5330
5331Submissions which do not conform to the standards may be returned
5332with a request to reformat the changes.
wdenkc6097192002-11-03 00:24:07 +00005333
5334
wdenk2729af92004-05-03 20:45:30 +00005335Submitting Patches:
5336-------------------
wdenkc6097192002-11-03 00:24:07 +00005337
wdenk2729af92004-05-03 20:45:30 +00005338Since the number of patches for U-Boot is growing, we need to
5339establish some rules. Submissions which do not conform to these rules
5340may be rejected, even when they contain important and valuable stuff.
wdenkc6097192002-11-03 00:24:07 +00005341
Magnus Lilja0d28f342008-08-06 19:32:33 +02005342Please see http://www.denx.de/wiki/U-Boot/Patches for details.
Wolfgang Denk218ca722008-03-26 10:40:12 +01005343
Wolfgang Denk06682362008-12-30 22:56:11 +01005344Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
5345see http://lists.denx.de/mailman/listinfo/u-boot
5346
wdenk2729af92004-05-03 20:45:30 +00005347When you send a patch, please include the following information with
5348it:
wdenkc6097192002-11-03 00:24:07 +00005349
wdenk2729af92004-05-03 20:45:30 +00005350* For bug fixes: a description of the bug and how your patch fixes
5351 this bug. Please try to include a way of demonstrating that the
5352 patch actually fixes something.
wdenkc6097192002-11-03 00:24:07 +00005353
wdenk2729af92004-05-03 20:45:30 +00005354* For new features: a description of the feature and your
5355 implementation.
wdenkc6097192002-11-03 00:24:07 +00005356
wdenk2729af92004-05-03 20:45:30 +00005357* A CHANGELOG entry as plaintext (separate from the patch)
5358
5359* For major contributions, your entry to the CREDITS file
5360
5361* When you add support for a new board, don't forget to add this
Wolfgang Denk7ca92962011-07-27 10:59:55 +00005362 board to the MAINTAINERS file, too.
wdenk2729af92004-05-03 20:45:30 +00005363
5364* If your patch adds new configuration options, don't forget to
5365 document these in the README file.
5366
Wolfgang Denk218ca722008-03-26 10:40:12 +01005367* The patch itself. If you are using git (which is *strongly*
5368 recommended) you can easily generate the patch using the
Wolfgang Denk7ca92962011-07-27 10:59:55 +00005369 "git format-patch". If you then use "git send-email" to send it to
Wolfgang Denk218ca722008-03-26 10:40:12 +01005370 the U-Boot mailing list, you will avoid most of the common problems
5371 with some other mail clients.
wdenk2729af92004-05-03 20:45:30 +00005372
Wolfgang Denk218ca722008-03-26 10:40:12 +01005373 If you cannot use git, use "diff -purN OLD NEW". If your version of
5374 diff does not support these options, then get the latest version of
5375 GNU diff.
wdenk2729af92004-05-03 20:45:30 +00005376
Wolfgang Denk218ca722008-03-26 10:40:12 +01005377 The current directory when running this command shall be the parent
5378 directory of the U-Boot source tree (i. e. please make sure that
5379 your patch includes sufficient directory information for the
5380 affected files).
5381
5382 We prefer patches as plain text. MIME attachments are discouraged,
5383 and compressed attachments must not be used.
wdenk2729af92004-05-03 20:45:30 +00005384
5385* If one logical set of modifications affects or creates several
5386 files, all these changes shall be submitted in a SINGLE patch file.
5387
5388* Changesets that contain different, unrelated modifications shall be
5389 submitted as SEPARATE patches, one patch per changeset.
5390
5391
5392Notes:
5393
5394* Before sending the patch, run the MAKEALL script on your patched
5395 source tree and make sure that no errors or warnings are reported
5396 for any of the boards.
5397
5398* Keep your modifications to the necessary minimum: A patch
5399 containing several unrelated changes or arbitrary reformats will be
5400 returned with a request to re-formatting / split it.
5401
5402* If you modify existing code, make sure that your new code does not
5403 add to the memory footprint of the code ;-) Small is beautiful!
5404 When adding new features, these should compile conditionally only
5405 (using #ifdef), and the resulting code with the new feature
5406 disabled must not need more memory than the old code without your
5407 modification.
wdenk90dc6702005-05-03 14:12:25 +00005408
Wolfgang Denk06682362008-12-30 22:56:11 +01005409* Remember that there is a size limit of 100 kB per message on the
5410 u-boot mailing list. Bigger patches will be moderated. If they are
5411 reasonable and not too big, they will be acknowledged. But patches
5412 bigger than the size limit should be avoided.