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wdenkc6097192002-11-03 00:24:07 +00001#
Wolfgang Denk218ca722008-03-26 10:40:12 +01002# (C) Copyright 2000 - 2008
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
wdenkc6097192002-11-03 00:24:07 +000057
58Where to get help:
59==================
60
wdenk24ee89b2002-11-03 17:56:27 +000061In case you have questions about, problems with or contributions for
62U-Boot you should send a message to the U-Boot mailing list at
Peter Tyser0c325652008-09-10 09:18:34 -050063<u-boot@lists.denx.de>. There is also an archive of previous traffic
64on the mailing list - please search the archive before asking FAQ's.
65Please see http://lists.denx.de/pipermail/u-boot and
66http://dir.gmane.org/gmane.comp.boot-loaders.u-boot
wdenkc6097192002-11-03 00:24:07 +000067
68
Wolfgang Denk218ca722008-03-26 10:40:12 +010069Where to get source code:
70=========================
71
72The U-Boot source code is maintained in the git repository at
73git://www.denx.de/git/u-boot.git ; you can browse it online at
74http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
75
76The "snapshot" links on this page allow you to download tarballs of
Marcel Ziswiler11ccc332008-07-09 08:17:15 +020077any version you might be interested in. Official releases are also
Wolfgang Denk218ca722008-03-26 10:40:12 +010078available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
79directory.
80
Anatolij Gustschind4ee7112008-03-26 18:13:33 +010081Pre-built (and tested) images are available from
Wolfgang Denk218ca722008-03-26 10:40:12 +010082ftp://ftp.denx.de/pub/u-boot/images/
83
84
wdenkc6097192002-11-03 00:24:07 +000085Where we come from:
86===================
87
88- start from 8xxrom sources
wdenk24ee89b2002-11-03 17:56:27 +000089- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
wdenkc6097192002-11-03 00:24:07 +000090- clean up code
91- make it easier to add custom boards
92- make it possible to add other [PowerPC] CPUs
93- extend functions, especially:
94 * Provide extended interface to Linux boot loader
95 * S-Record download
96 * network boot
Marcel Ziswiler11ccc332008-07-09 08:17:15 +020097 * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
wdenk24ee89b2002-11-03 17:56:27 +000098- create ARMBoot project (http://sourceforge.net/projects/armboot)
wdenkc6097192002-11-03 00:24:07 +000099- add other CPU families (starting with ARM)
wdenk24ee89b2002-11-03 17:56:27 +0000100- create U-Boot project (http://sourceforge.net/projects/u-boot)
Magnus Lilja0d28f342008-08-06 19:32:33 +0200101- current project page: see http://www.denx.de/wiki/U-Boot
wdenk24ee89b2002-11-03 17:56:27 +0000102
103
104Names and Spelling:
105===================
106
107The "official" name of this project is "Das U-Boot". The spelling
108"U-Boot" shall be used in all written text (documentation, comments
109in source files etc.). Example:
110
111 This is the README file for the U-Boot project.
112
113File names etc. shall be based on the string "u-boot". Examples:
114
115 include/asm-ppc/u-boot.h
116
117 #include <asm/u-boot.h>
118
119Variable names, preprocessor constants etc. shall be either based on
120the string "u_boot" or on "U_BOOT". Example:
121
122 U_BOOT_VERSION u_boot_logo
123 IH_OS_U_BOOT u_boot_hush_start
wdenkc6097192002-11-03 00:24:07 +0000124
125
wdenk93f19cc2002-12-17 17:55:09 +0000126Versioning:
127===========
128
129U-Boot uses a 3 level version number containing a version, a
130sub-version, and a patchlevel: "U-Boot-2.34.5" means version "2",
131sub-version "34", and patchlevel "4".
132
133The patchlevel is used to indicate certain stages of development
134between released versions, i. e. officially released versions of
135U-Boot will always have a patchlevel of "0".
136
137
wdenkc6097192002-11-03 00:24:07 +0000138Directory Hierarchy:
139====================
140
wdenk7152b1d2003-09-05 23:19:14 +0000141- board Board dependent files
142- common Misc architecture independent functions
wdenkc6097192002-11-03 00:24:07 +0000143- cpu CPU specific files
wdenk983fda82004-10-28 00:09:35 +0000144 - 74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000145 - arm720t Files specific to ARM 720 CPUs
146 - arm920t Files specific to ARM 920 CPUs
wdenka85f9f22005-04-06 13:52:31 +0000147 - at91rm9200 Files specific to Atmel AT91RM9200 CPU
wdenk983fda82004-10-28 00:09:35 +0000148 - imx Files specific to Freescale MC9328 i.MX CPUs
wdenk1d9f4102004-10-09 22:21:29 +0000149 - s3c24x0 Files specific to Samsung S3C24X0 CPUs
wdenk11dadd52004-02-27 00:07:27 +0000150 - arm925t Files specific to ARM 925 CPUs
151 - arm926ejs Files specific to ARM 926 CPUs
wdenk8ed96042005-01-09 23:16:25 +0000152 - arm1136 Files specific to ARM 1136 CPUs
Wolfgang Denk72a087e2006-10-24 14:27:35 +0200153 - at32ap Files specific to Atmel AVR32 AP CPUs
Mike Frysingeradbfeeb2008-08-07 17:50:26 -0400154 - blackfin Files specific to Analog Devices Blackfin CPUs
wdenk11dadd52004-02-27 00:07:27 +0000155 - i386 Files specific to i386 CPUs
156 - ixp Files specific to Intel XScale IXP CPUs
Daniel Hellstromb3309902008-03-28 10:00:33 +0100157 - leon2 Files specific to Gaisler LEON2 SPARC CPU
Daniel Hellstrom1e9a1642008-03-26 22:51:29 +0100158 - leon3 Files specific to Gaisler LEON3 SPARC CPU
wdenk983fda82004-10-28 00:09:35 +0000159 - mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
TsiChungLiew1552af72008-01-14 17:43:33 -0600160 - mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
TsiChung Liew8e585f02007-06-18 13:50:13 -0500161 - mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
TsiChungLiew8ae158c2007-08-16 15:05:11 -0500162 - mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs
TsiChungLiew57a12722008-01-15 14:15:46 -0600163 - mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs
wdenk11dadd52004-02-27 00:07:27 +0000164 - mips Files specific to MIPS CPUs
wdenk983fda82004-10-28 00:09:35 +0000165 - mpc5xx Files specific to Freescale MPC5xx CPUs
166 - mpc5xxx Files specific to Freescale MPC5xxx CPUs
167 - mpc8xx Files specific to Freescale MPC8xx CPUs
168 - mpc8220 Files specific to Freescale MPC8220 CPUs
169 - mpc824x Files specific to Freescale MPC824x CPUs
170 - mpc8260 Files specific to Freescale MPC8260 CPUs
171 - mpc85xx Files specific to Freescale MPC85xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000172 - nios Files specific to Altera NIOS CPUs
wdenk5c952cf2004-10-10 21:27:30 +0000173 - nios2 Files specific to Altera Nios-II CPUs
Wolfgang Denk0c8721a2005-09-23 11:05:55 +0200174 - ppc4xx Files specific to AMCC PowerPC 4xx CPUs
wdenk11dadd52004-02-27 00:07:27 +0000175 - pxa Files specific to Intel XScale PXA CPUs
176 - s3c44b0 Files specific to Samsung S3C44B0 CPUs
177 - sa1100 Files specific to Intel StrongARM SA1100 CPUs
wdenkc6097192002-11-03 00:24:07 +0000178- disk Code for disk drive partition handling
179- doc Documentation (don't expect too much)
wdenk7152b1d2003-09-05 23:19:14 +0000180- drivers Commonly used device drivers
wdenkc6097192002-11-03 00:24:07 +0000181- dtt Digital Thermometer and Thermostat drivers
182- examples Example code for standalone applications, etc.
183- include Header Files
wdenk11dadd52004-02-27 00:07:27 +0000184- lib_arm Files generic to ARM architecture
Wolfgang Denk7b64fef2006-10-24 14:21:16 +0200185- lib_avr32 Files generic to AVR32 architecture
Mike Frysingeradbfeeb2008-08-07 17:50:26 -0400186- lib_blackfin Files generic to Blackfin architecture
wdenk11dadd52004-02-27 00:07:27 +0000187- lib_generic Files generic to all architectures
188- lib_i386 Files generic to i386 architecture
189- lib_m68k Files generic to m68k architecture
190- lib_mips Files generic to MIPS architecture
191- lib_nios Files generic to NIOS architecture
192- lib_ppc Files generic to PowerPC architecture
Daniel Hellstromc2f02da2008-03-28 09:47:00 +0100193- lib_sparc Files generic to SPARC architecture
Wolfgang Denk218ca722008-03-26 10:40:12 +0100194- libfdt Library files to support flattened device trees
wdenkc6097192002-11-03 00:24:07 +0000195- net Networking code
wdenkc6097192002-11-03 00:24:07 +0000196- post Power On Self Test
wdenkc6097192002-11-03 00:24:07 +0000197- rtc Real Time Clock drivers
198- tools Tools to build S-Record or U-Boot images, etc.
199
wdenkc6097192002-11-03 00:24:07 +0000200Software Configuration:
201=======================
202
203Configuration is usually done using C preprocessor defines; the
204rationale behind that is to avoid dead code whenever possible.
205
206There are two classes of configuration variables:
207
208* Configuration _OPTIONS_:
209 These are selectable by the user and have names beginning with
210 "CONFIG_".
211
212* Configuration _SETTINGS_:
213 These depend on the hardware etc. and should not be meddled with if
214 you don't know what you're doing; they have names beginning with
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200215 "CONFIG_SYS_".
wdenkc6097192002-11-03 00:24:07 +0000216
217Later we will add a configuration tool - probably similar to or even
218identical to what's used for the Linux kernel. Right now, we have to
219do the configuration by hand, which means creating some symbolic
220links and editing some configuration files. We use the TQM8xxL boards
221as an example here.
222
223
224Selection of Processor Architecture and Board Type:
225---------------------------------------------------
226
227For all supported boards there are ready-to-use default
228configurations available; just type "make <board_name>_config".
229
230Example: For a TQM823L module type:
231
232 cd u-boot
233 make TQM823L_config
234
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200235For the Cogent platform, you need to specify the CPU type as well;
wdenkc6097192002-11-03 00:24:07 +0000236e.g. "make cogent_mpc8xx_config". And also configure the cogent
237directory according to the instructions in cogent/README.
238
239
240Configuration Options:
241----------------------
242
243Configuration depends on the combination of board and CPU type; all
244such information is kept in a configuration file
245"include/configs/<board_name>.h".
246
247Example: For a TQM823L module, all configuration settings are in
248"include/configs/TQM823L.h".
249
250
wdenk7f6c2cb2002-11-10 22:06:23 +0000251Many of the options are named exactly as the corresponding Linux
252kernel configuration options. The intention is to make it easier to
253build a config tool - later.
254
255
wdenkc6097192002-11-03 00:24:07 +0000256The following options need to be configured:
257
Kim Phillips26281142007-08-10 13:28:25 -0500258- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX.
wdenkc6097192002-11-03 00:24:07 +0000259
Kim Phillips26281142007-08-10 13:28:25 -0500260- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
Wolfgang Denk6ccec442006-10-24 14:42:37 +0200261
262- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
Haavard Skinnemoen09ea0de2007-11-01 12:44:20 +0100263 Define exactly one, e.g. CONFIG_ATSTK1002
wdenkc6097192002-11-03 00:24:07 +0000264
265- CPU Module Type: (if CONFIG_COGENT is defined)
266 Define exactly one of
267 CONFIG_CMA286_60_OLD
268--- FIXME --- not tested yet:
269 CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
270 CONFIG_CMA287_23, CONFIG_CMA287_50
271
272- Motherboard Type: (if CONFIG_COGENT is defined)
273 Define exactly one of
274 CONFIG_CMA101, CONFIG_CMA102
275
276- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
277 Define one or more of
278 CONFIG_CMA302
279
280- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
281 Define one or more of
282 CONFIG_LCD_HEARTBEAT - update a character position on
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200283 the LCD display every second with
wdenkc6097192002-11-03 00:24:07 +0000284 a "rotator" |\-/|\-/
285
wdenk2535d602003-07-17 23:16:40 +0000286- Board flavour: (if CONFIG_MPC8260ADS is defined)
287 CONFIG_ADSTYPE
288 Possible values are:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200289 CONFIG_SYS_8260ADS - original MPC8260ADS
290 CONFIG_SYS_8266ADS - MPC8266ADS
291 CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR
292 CONFIG_SYS_8272ADS - MPC8272ADS
wdenk2535d602003-07-17 23:16:40 +0000293
wdenkc6097192002-11-03 00:24:07 +0000294- MPC824X Family Member (if CONFIG_MPC824X is defined)
wdenk5da627a2003-10-09 20:09:04 +0000295 Define exactly one of
296 CONFIG_MPC8240, CONFIG_MPC8245
wdenkc6097192002-11-03 00:24:07 +0000297
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200298- 8xx CPU Options: (if using an MPC8xx CPU)
wdenk66ca92a2004-09-28 17:59:53 +0000299 CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
300 get_gclk_freq() cannot work
wdenk5da627a2003-10-09 20:09:04 +0000301 e.g. if there is no 32KHz
302 reference PIT/RTC clock
wdenk66ca92a2004-09-28 17:59:53 +0000303 CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK
304 or XTAL/EXTAL)
wdenkc6097192002-11-03 00:24:07 +0000305
wdenk66ca92a2004-09-28 17:59:53 +0000306- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200307 CONFIG_SYS_8xx_CPUCLK_MIN
308 CONFIG_SYS_8xx_CPUCLK_MAX
wdenk66ca92a2004-09-28 17:59:53 +0000309 CONFIG_8xx_CPUCLK_DEFAULT
wdenk75d1ea72004-01-31 20:06:54 +0000310 See doc/README.MPC866
311
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200312 CONFIG_SYS_MEASURE_CPUCLK
wdenk75d1ea72004-01-31 20:06:54 +0000313
wdenkba56f622004-02-06 23:19:44 +0000314 Define this to measure the actual CPU clock instead
315 of relying on the correctness of the configured
316 values. Mostly useful for board bringup to make sure
317 the PLL is locked at the intended frequency. Note
318 that this requires a (stable) reference clock (32 kHz
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200319 RTC clock or CONFIG_SYS_8XX_XIN)
wdenk75d1ea72004-01-31 20:06:54 +0000320
Heiko Schocher506f3912009-03-12 07:37:15 +0100321 CONFIG_SYS_DELAYED_ICACHE
322
323 Define this option if you want to enable the
324 ICache only when Code runs from RAM.
325
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100326- Intel Monahans options:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200327 CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100328
329 Defines the Monahans run mode to oscillator
330 ratio. Valid values are 8, 16, 24, 31. The core
331 frequency is this value multiplied by 13 MHz.
332
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200333 CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200334
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100335 Defines the Monahans turbo mode to oscillator
336 ratio. Valid values are 1 (default if undefined) and
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200337 2. The core frequency as calculated above is multiplied
Markus Klotzbuecher0b953ff2006-03-24 15:28:02 +0100338 by this value.
Wolfgang Denkcf48eb92006-04-16 10:51:58 +0200339
wdenk5da627a2003-10-09 20:09:04 +0000340- Linux Kernel Interface:
wdenkc6097192002-11-03 00:24:07 +0000341 CONFIG_CLOCKS_IN_MHZ
342
343 U-Boot stores all clock information in Hz
344 internally. For binary compatibility with older Linux
345 kernels (which expect the clocks passed in the
346 bd_info data to be in MHz) the environment variable
347 "clocks_in_mhz" can be defined so that U-Boot
348 converts clock data to MHZ before passing it to the
349 Linux kernel.
wdenkc6097192002-11-03 00:24:07 +0000350 When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
Wolfgang Denk218ca722008-03-26 10:40:12 +0100351 "clocks_in_mhz=1" is automatically included in the
wdenkc6097192002-11-03 00:24:07 +0000352 default environment.
353
wdenk5da627a2003-10-09 20:09:04 +0000354 CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
355
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200356 When transferring memsize parameter to linux, some versions
wdenk5da627a2003-10-09 20:09:04 +0000357 expect it to be in bytes, others in MB.
358 Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
359
Gerald Van Barenfec6d9e2008-06-03 20:34:45 -0400360 CONFIG_OF_LIBFDT
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200361
362 New kernel versions are expecting firmware settings to be
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400363 passed using flattened device trees (based on open firmware
364 concepts).
365
366 CONFIG_OF_LIBFDT
367 * New libfdt-based support
368 * Adds the "fdt" command
Kim Phillips3bb342f2007-08-10 14:34:14 -0500369 * The bootm command automatically updates the fdt
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400370
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200371 OF_CPU - The proper name of the cpus node.
Kumar Galac2871f02006-01-11 13:59:02 -0600372 OF_SOC - The proper name of the soc node.
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200373 OF_TBCLK - The timebase frequency.
Kumar Galac2871f02006-01-11 13:59:02 -0600374 OF_STDOUT_PATH - The path to the console device
Wolfgang Denkf57f70a2005-10-13 01:45:54 +0200375
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200376 boards with QUICC Engines require OF_QE to set UCC MAC
377 addresses
Kim Phillips3bb342f2007-08-10 14:34:14 -0500378
Kumar Gala4e253132006-01-11 13:54:17 -0600379 CONFIG_OF_BOARD_SETUP
380
381 Board code has addition modification that it wants to make
382 to the flat device tree before handing it off to the kernel
wdenk6705d812004-08-02 23:22:59 +0000383
Matthew McClintock02677682006-06-28 10:41:37 -0500384 CONFIG_OF_BOOT_CPU
385
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200386 This define fills in the correct boot CPU in the boot
Matthew McClintock02677682006-06-28 10:41:37 -0500387 param header, the default value is zero if undefined.
388
Niklaus Giger0b2f4ec2008-11-03 22:13:47 +0100389- vxWorks boot parameters:
390
391 bootvx constructs a valid bootline using the following
392 environments variables: bootfile, ipaddr, serverip, hostname.
393 It loads the vxWorks image pointed bootfile.
394
395 CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
396 CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
397 CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
398 CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
399
400 CONFIG_SYS_VXWORKS_ADD_PARAMS
401
402 Add it at the end of the bootline. E.g "u=username pw=secret"
403
404 Note: If a "bootargs" environment is defined, it will overwride
405 the defaults discussed just above.
406
wdenk6705d812004-08-02 23:22:59 +0000407- Serial Ports:
Andreas Engel48d01922008-09-08 14:30:53 +0200408 CONFIG_PL010_SERIAL
wdenk6705d812004-08-02 23:22:59 +0000409
410 Define this if you want support for Amba PrimeCell PL010 UARTs.
411
Andreas Engel48d01922008-09-08 14:30:53 +0200412 CONFIG_PL011_SERIAL
wdenk6705d812004-08-02 23:22:59 +0000413
414 Define this if you want support for Amba PrimeCell PL011 UARTs.
415
416 CONFIG_PL011_CLOCK
417
418 If you have Amba PrimeCell PL011 UARTs, set this variable to
419 the clock speed of the UARTs.
420
421 CONFIG_PL01x_PORTS
422
423 If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
424 define this to a list of base addresses for each (supported)
425 port. See e.g. include/configs/versatile.h
426
427
wdenkc6097192002-11-03 00:24:07 +0000428- Console Interface:
wdenk43d96162003-03-06 00:02:04 +0000429 Depending on board, define exactly one serial port
430 (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
431 CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
432 console by defining CONFIG_8xx_CONS_NONE
wdenkc6097192002-11-03 00:24:07 +0000433
434 Note: if CONFIG_8xx_CONS_NONE is defined, the serial
435 port routines must be defined elsewhere
436 (i.e. serial_init(), serial_getc(), ...)
437
438 CONFIG_CFB_CONSOLE
439 Enables console device for a color framebuffer. Needs following
440 defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
441 VIDEO_FB_LITTLE_ENDIAN graphic memory organisation
442 (default big endian)
443 VIDEO_HW_RECTFILL graphic chip supports
444 rectangle fill
445 (cf. smiLynxEM)
446 VIDEO_HW_BITBLT graphic chip supports
447 bit-blit (cf. smiLynxEM)
448 VIDEO_VISIBLE_COLS visible pixel columns
449 (cols=pitch)
wdenkba56f622004-02-06 23:19:44 +0000450 VIDEO_VISIBLE_ROWS visible pixel rows
451 VIDEO_PIXEL_SIZE bytes per pixel
wdenkc6097192002-11-03 00:24:07 +0000452 VIDEO_DATA_FORMAT graphic data format
453 (0-5, cf. cfb_console.c)
wdenkba56f622004-02-06 23:19:44 +0000454 VIDEO_FB_ADRS framebuffer address
wdenkc6097192002-11-03 00:24:07 +0000455 VIDEO_KBD_INIT_FCT keyboard int fct
456 (i.e. i8042_kbd_init())
457 VIDEO_TSTC_FCT test char fct
458 (i.e. i8042_tstc)
459 VIDEO_GETC_FCT get char fct
460 (i.e. i8042_getc)
461 CONFIG_CONSOLE_CURSOR cursor drawing on/off
462 (requires blink timer
463 cf. i8042.c)
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200464 CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
wdenkc6097192002-11-03 00:24:07 +0000465 CONFIG_CONSOLE_TIME display time/date info in
466 upper right corner
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500467 (requires CONFIG_CMD_DATE)
wdenkc6097192002-11-03 00:24:07 +0000468 CONFIG_VIDEO_LOGO display Linux logo in
469 upper left corner
wdenka6c7ad22002-12-03 21:28:10 +0000470 CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of
471 linux_logo.h for logo.
472 Requires CONFIG_VIDEO_LOGO
wdenkc6097192002-11-03 00:24:07 +0000473 CONFIG_CONSOLE_EXTRA_INFO
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200474 additional board info beside
wdenkc6097192002-11-03 00:24:07 +0000475 the logo
476
wdenk43d96162003-03-06 00:02:04 +0000477 When CONFIG_CFB_CONSOLE is defined, video console is
478 default i/o. Serial console can be forced with
479 environment 'console=serial'.
wdenkc6097192002-11-03 00:24:07 +0000480
wdenkd4ca31c2004-01-02 14:00:00 +0000481 When CONFIG_SILENT_CONSOLE is defined, all console
482 messages (by U-Boot and Linux!) can be silenced with
483 the "silent" environment variable. See
484 doc/README.silent for more information.
wdenka3ad8e22003-10-19 23:22:11 +0000485
wdenkc6097192002-11-03 00:24:07 +0000486- Console Baudrate:
487 CONFIG_BAUDRATE - in bps
488 Select one of the baudrates listed in
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200489 CONFIG_SYS_BAUDRATE_TABLE, see below.
490 CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
wdenkc6097192002-11-03 00:24:07 +0000491
Heiko Schocherc92fac92009-01-30 12:55:38 +0100492- Console Rx buffer length
493 With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
494 the maximum receive buffer length for the SMC.
Heiko Schocher2b3f12c2009-02-10 09:31:47 +0100495 This option is actual only for 82xx and 8xx possible.
Heiko Schocherc92fac92009-01-30 12:55:38 +0100496 If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
497 must be defined, to setup the maximum idle timeout for
498 the SMC.
499
wdenkc6097192002-11-03 00:24:07 +0000500- Interrupt driven serial port input:
501 CONFIG_SERIAL_SOFTWARE_FIFO
502
503 PPC405GP only.
504 Use an interrupt handler for receiving data on the
505 serial port. It also enables using hardware handshake
506 (RTS/CTS) and UART's built-in FIFO. Set the number of
507 bytes the interrupt driven input buffer should have.
508
wdenk109c0e32004-03-23 21:43:07 +0000509 Leave undefined to disable this feature, including
510 disable the buffer and hardware handshake.
wdenkc6097192002-11-03 00:24:07 +0000511
stroese1d49b1f2003-05-23 11:39:05 +0000512- Console UART Number:
513 CONFIG_UART1_CONSOLE
514
Wolfgang Denk0c8721a2005-09-23 11:05:55 +0200515 AMCC PPC4xx only.
stroese1d49b1f2003-05-23 11:39:05 +0000516 If defined internal UART1 (and not UART0) is used
517 as default U-Boot console.
518
wdenkc6097192002-11-03 00:24:07 +0000519- Boot Delay: CONFIG_BOOTDELAY - in seconds
520 Delay before automatically booting the default image;
521 set to -1 to disable autoboot.
522
523 See doc/README.autoboot for these options that
524 work with CONFIG_BOOTDELAY. None are required.
525 CONFIG_BOOT_RETRY_TIME
526 CONFIG_BOOT_RETRY_MIN
527 CONFIG_AUTOBOOT_KEYED
528 CONFIG_AUTOBOOT_PROMPT
529 CONFIG_AUTOBOOT_DELAY_STR
530 CONFIG_AUTOBOOT_STOP_STR
531 CONFIG_AUTOBOOT_DELAY_STR2
532 CONFIG_AUTOBOOT_STOP_STR2
533 CONFIG_ZERO_BOOTDELAY_CHECK
534 CONFIG_RESET_TO_RETRY
535
536- Autoboot Command:
537 CONFIG_BOOTCOMMAND
538 Only needed when CONFIG_BOOTDELAY is enabled;
539 define a command string that is automatically executed
540 when no character is read on the console interface
541 within "Boot Delay" after reset.
542
543 CONFIG_BOOTARGS
wdenk43d96162003-03-06 00:02:04 +0000544 This can be used to pass arguments to the bootm
545 command. The value of CONFIG_BOOTARGS goes into the
546 environment value "bootargs".
wdenkc6097192002-11-03 00:24:07 +0000547
548 CONFIG_RAMBOOT and CONFIG_NFSBOOT
wdenk43d96162003-03-06 00:02:04 +0000549 The value of these goes into the environment as
550 "ramboot" and "nfsboot" respectively, and can be used
551 as a convenience, when switching between booting from
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200552 RAM and NFS.
wdenkc6097192002-11-03 00:24:07 +0000553
554- Pre-Boot Commands:
555 CONFIG_PREBOOT
556
557 When this option is #defined, the existence of the
558 environment variable "preboot" will be checked
559 immediately before starting the CONFIG_BOOTDELAY
560 countdown and/or running the auto-boot command resp.
561 entering interactive mode.
562
563 This feature is especially useful when "preboot" is
564 automatically generated or modified. For an example
565 see the LWMON board specific code: here "preboot" is
566 modified when the user holds down a certain
567 combination of keys on the (special) keyboard when
568 booting the systems
569
570- Serial Download Echo Mode:
571 CONFIG_LOADS_ECHO
572 If defined to 1, all characters received during a
573 serial download (using the "loads" command) are
574 echoed back. This might be needed by some terminal
575 emulations (like "cu"), but may as well just take
576 time on others. This setting #define's the initial
577 value of the "loads_echo" environment variable.
578
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500579- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
wdenkc6097192002-11-03 00:24:07 +0000580 CONFIG_KGDB_BAUDRATE
581 Select one of the baudrates listed in
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200582 CONFIG_SYS_BAUDRATE_TABLE, see below.
wdenkc6097192002-11-03 00:24:07 +0000583
584- Monitor Functions:
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500585 Monitor commands can be included or excluded
586 from the build by using the #include files
587 "config_cmd_all.h" and #undef'ing unwanted
588 commands, or using "config_cmd_default.h"
589 and augmenting with additional #define's
590 for wanted commands.
wdenkc6097192002-11-03 00:24:07 +0000591
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500592 The default command configuration includes all commands
593 except those marked below with a "*".
wdenkc6097192002-11-03 00:24:07 +0000594
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500595 CONFIG_CMD_ASKENV * ask for env variable
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500596 CONFIG_CMD_BDI bdinfo
597 CONFIG_CMD_BEDBUG * Include BedBug Debugger
598 CONFIG_CMD_BMP * BMP support
599 CONFIG_CMD_BSP * Board specific commands
600 CONFIG_CMD_BOOTD bootd
601 CONFIG_CMD_CACHE * icache, dcache
602 CONFIG_CMD_CONSOLE coninfo
603 CONFIG_CMD_DATE * support for RTC, date/time...
604 CONFIG_CMD_DHCP * DHCP support
605 CONFIG_CMD_DIAG * Diagnostics
606 CONFIG_CMD_DOC * Disk-On-Chip Support
Peter Tysera7c93102008-12-17 16:36:22 -0600607 CONFIG_CMD_DS4510 * ds4510 I2C gpio commands
608 CONFIG_CMD_DS4510_INFO * ds4510 I2C info command
609 CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd
610 CONFIG_CMD_DS4510_RST * ds4510 I2C rst command
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500611 CONFIG_CMD_DTT * Digital Therm and Thermostat
612 CONFIG_CMD_ECHO echo arguments
613 CONFIG_CMD_EEPROM * EEPROM read/write support
614 CONFIG_CMD_ELF * bootelf, bootvx
Mike Frysingerbdab39d2009-01-28 19:08:14 -0500615 CONFIG_CMD_SAVEENV saveenv
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500616 CONFIG_CMD_FDC * Floppy Disk Support
617 CONFIG_CMD_FAT * FAT partition support
618 CONFIG_CMD_FDOS * Dos diskette Support
619 CONFIG_CMD_FLASH flinfo, erase, protect
620 CONFIG_CMD_FPGA FPGA device initialization support
621 CONFIG_CMD_HWFLOW * RTS/CTS hw flow control
622 CONFIG_CMD_I2C * I2C serial bus support
623 CONFIG_CMD_IDE * IDE harddisk support
624 CONFIG_CMD_IMI iminfo
625 CONFIG_CMD_IMLS List all found images
626 CONFIG_CMD_IMMAP * IMMR dump support
627 CONFIG_CMD_IRQ * irqinfo
628 CONFIG_CMD_ITEST Integer/string test of 2 values
629 CONFIG_CMD_JFFS2 * JFFS2 Support
630 CONFIG_CMD_KGDB * kgdb
631 CONFIG_CMD_LOADB loadb
632 CONFIG_CMD_LOADS loads
633 CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,
634 loop, loopw, mtest
635 CONFIG_CMD_MISC Misc functions like sleep etc
636 CONFIG_CMD_MMC * MMC memory mapped support
637 CONFIG_CMD_MII * MII utility commands
Stefan Roese68d7d652009-03-19 13:30:36 +0100638 CONFIG_CMD_MTDPARTS * MTD partition support
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500639 CONFIG_CMD_NAND * NAND support
640 CONFIG_CMD_NET bootp, tftpboot, rarpboot
Peter Tysere92739d2008-12-17 16:36:21 -0600641 CONFIG_CMD_PCA953X * PCA953x I2C gpio commands
642 CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500643 CONFIG_CMD_PCI * pciinfo
644 CONFIG_CMD_PCMCIA * PCMCIA support
645 CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network
646 host
647 CONFIG_CMD_PORTIO * Port I/O
648 CONFIG_CMD_REGINFO * Register dump
649 CONFIG_CMD_RUN run command in env variable
650 CONFIG_CMD_SAVES * save S record dump
651 CONFIG_CMD_SCSI * SCSI Support
652 CONFIG_CMD_SDRAM * print SDRAM configuration information
653 (requires CONFIG_CMD_I2C)
654 CONFIG_CMD_SETGETDCR Support for DCR Register access
655 (4xx only)
Wolfgang Denk74de7ae2009-04-01 23:34:12 +0200656 CONFIG_CMD_SOURCE "source" command Support
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500657 CONFIG_CMD_SPI * SPI serial bus support
658 CONFIG_CMD_USB * USB support
659 CONFIG_CMD_VFD * VFD support (TRAB)
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500660 CONFIG_CMD_CDP * Cisco Discover Protocol support
661 CONFIG_CMD_FSL * Microblaze FSL support
wdenkc6097192002-11-03 00:24:07 +0000662
wdenkc6097192002-11-03 00:24:07 +0000663
664 EXAMPLE: If you want all functions except of network
665 support you can write:
666
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500667 #include "config_cmd_all.h"
668 #undef CONFIG_CMD_NET
wdenkc6097192002-11-03 00:24:07 +0000669
Gerald Van Baren213bf8c2007-03-31 12:23:51 -0400670 Other Commands:
671 fdt (flattened device tree) command: CONFIG_OF_LIBFDT
wdenkc6097192002-11-03 00:24:07 +0000672
673 Note: Don't enable the "icache" and "dcache" commands
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500674 (configuration option CONFIG_CMD_CACHE) unless you know
wdenk43d96162003-03-06 00:02:04 +0000675 what you (and your U-Boot users) are doing. Data
676 cache cannot be enabled on systems like the 8xx or
677 8260 (where accesses to the IMMR region must be
678 uncached), and it cannot be disabled on all other
679 systems where we (mis-) use the data cache to hold an
680 initial stack and some data.
wdenkc6097192002-11-03 00:24:07 +0000681
682
683 XXX - this list needs to get updated!
684
685- Watchdog:
686 CONFIG_WATCHDOG
687 If this variable is defined, it enables watchdog
wdenk7152b1d2003-09-05 23:19:14 +0000688 support. There must be support in the platform specific
wdenkc6097192002-11-03 00:24:07 +0000689 code for a watchdog. For the 8xx and 8260 CPUs, the
690 SIU Watchdog feature is enabled in the SYPCR
691 register.
692
stroesec1551ea2003-04-04 15:53:41 +0000693- U-Boot Version:
694 CONFIG_VERSION_VARIABLE
695 If this variable is defined, an environment variable
696 named "ver" is created by U-Boot showing the U-Boot
697 version as printed by the "version" command.
698 This variable is readonly.
699
wdenkc6097192002-11-03 00:24:07 +0000700- Real-Time Clock:
701
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500702 When CONFIG_CMD_DATE is selected, the type of the RTC
wdenkc6097192002-11-03 00:24:07 +0000703 has to be selected, too. Define exactly one of the
704 following options:
705
706 CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
707 CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
Guennadi Liakhovetski7ce63702008-04-15 14:15:30 +0200708 CONFIG_RTC_MC13783 - use MC13783 RTC
wdenkc6097192002-11-03 00:24:07 +0000709 CONFIG_RTC_MC146818 - use MC146818 RTC
wdenk1cb8e982003-03-06 21:55:29 +0000710 CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
wdenkc6097192002-11-03 00:24:07 +0000711 CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
wdenk7f70e852003-05-20 14:25:27 +0000712 CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC
wdenk3bac3512003-03-12 10:41:04 +0000713 CONFIG_RTC_DS164x - use Dallas DS164x RTC
Tor Krill9536dfc2008-03-15 15:40:26 +0100714 CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
wdenk4c0d4c32004-06-09 17:34:58 +0000715 CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200716 CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
wdenkc6097192002-11-03 00:24:07 +0000717
wdenkb37c7e52003-06-30 16:24:52 +0000718 Note that if the RTC uses I2C, then the I2C interface
719 must also be configured. See I2C Support, below.
720
Peter Tysere92739d2008-12-17 16:36:21 -0600721- GPIO Support:
722 CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO
723 CONFIG_PCA953X_INFO - enable pca953x info command
724
725 Note that if the GPIO device uses I2C, then the I2C interface
726 must also be configured. See I2C Support, below.
727
wdenkc6097192002-11-03 00:24:07 +0000728- Timestamp Support:
729
wdenk43d96162003-03-06 00:02:04 +0000730 When CONFIG_TIMESTAMP is selected, the timestamp
731 (date and time) of an image is printed by image
732 commands like bootm or iminfo. This option is
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500733 automatically enabled when you select CONFIG_CMD_DATE .
wdenkc6097192002-11-03 00:24:07 +0000734
735- Partition Support:
736 CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
richardretanubun07f3d782008-09-26 11:13:22 -0400737 and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
wdenkc6097192002-11-03 00:24:07 +0000738
Wolfgang Denk218ca722008-03-26 10:40:12 +0100739 If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
740 CONFIG_CMD_SCSI) you must configure support for at
741 least one partition type as well.
wdenkc6097192002-11-03 00:24:07 +0000742
743- IDE Reset method:
wdenk4d13cba2004-03-14 14:09:05 +0000744 CONFIG_IDE_RESET_ROUTINE - this is defined in several
745 board configurations files but used nowhere!
wdenkc6097192002-11-03 00:24:07 +0000746
wdenk4d13cba2004-03-14 14:09:05 +0000747 CONFIG_IDE_RESET - is this is defined, IDE Reset will
748 be performed by calling the function
749 ide_set_reset(int reset)
750 which has to be defined in a board specific file
wdenkc6097192002-11-03 00:24:07 +0000751
752- ATAPI Support:
753 CONFIG_ATAPI
754
755 Set this to enable ATAPI support.
756
wdenkc40b2952004-03-13 23:29:43 +0000757- LBA48 Support
758 CONFIG_LBA48
759
760 Set this to enable support for disks larger than 137GB
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200761 Also look at CONFIG_SYS_64BIT_LBA ,CONFIG_SYS_64BIT_VSPRINTF and CONFIG_SYS_64BIT_STRTOUL
wdenkc40b2952004-03-13 23:29:43 +0000762 Whithout these , LBA48 support uses 32bit variables and will 'only'
763 support disks up to 2.1TB.
764
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200765 CONFIG_SYS_64BIT_LBA:
wdenkc40b2952004-03-13 23:29:43 +0000766 When enabled, makes the IDE subsystem use 64bit sector addresses.
767 Default is 32bit.
768
wdenkc6097192002-11-03 00:24:07 +0000769- SCSI Support:
770 At the moment only there is only support for the
771 SYM53C8XX SCSI controller; define
772 CONFIG_SCSI_SYM53C8XX to enable it.
773
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200774 CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
775 CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
776 CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
wdenkc6097192002-11-03 00:24:07 +0000777 maximum numbers of LUNs, SCSI ID's and target
778 devices.
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200779 CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
wdenkc6097192002-11-03 00:24:07 +0000780
781- NETWORK Support (PCI):
wdenk682011f2003-06-03 23:54:09 +0000782 CONFIG_E1000
783 Support for Intel 8254x gigabit chips.
stroese53cf9432003-06-05 15:39:44 +0000784
Andre Schwarzac3315c2008-03-06 16:45:44 +0100785 CONFIG_E1000_FALLBACK_MAC
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200786 default MAC for empty EEPROM after production.
Andre Schwarzac3315c2008-03-06 16:45:44 +0100787
wdenkc6097192002-11-03 00:24:07 +0000788 CONFIG_EEPRO100
789 Support for Intel 82557/82559/82559ER chips.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200790 Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
wdenkc6097192002-11-03 00:24:07 +0000791 write routine for first time initialisation.
792
793 CONFIG_TULIP
794 Support for Digital 2114x chips.
795 Optional CONFIG_TULIP_SELECT_MEDIA for board specific
796 modem chip initialisation (KS8761/QS6611).
797
798 CONFIG_NATSEMI
799 Support for National dp83815 chips.
800
801 CONFIG_NS8382X
802 Support for National dp8382[01] gigabit chips.
803
wdenk45219c42003-05-12 21:50:16 +0000804- NETWORK Support (other):
805
806 CONFIG_DRIVER_LAN91C96
807 Support for SMSC's LAN91C96 chips.
808
809 CONFIG_LAN91C96_BASE
810 Define this to hold the physical address
811 of the LAN91C96's I/O space
812
813 CONFIG_LAN91C96_USE_32_BIT
814 Define this to enable 32 bit addressing
815
wdenkf39748a2004-06-09 13:37:52 +0000816 CONFIG_DRIVER_SMC91111
817 Support for SMSC's LAN91C111 chip
818
819 CONFIG_SMC91111_BASE
820 Define this to hold the physical address
821 of the device (I/O space)
822
823 CONFIG_SMC_USE_32_BIT
824 Define this if data bus is 32 bits
825
826 CONFIG_SMC_USE_IOFUNCS
827 Define this to use i/o functions instead of macros
828 (some hardware wont work with macros)
829
Jens Gehrlein557b3772008-05-05 14:06:11 +0200830 CONFIG_DRIVER_SMC911X
831 Support for SMSC's LAN911x and LAN921x chips
832
833 CONFIG_DRIVER_SMC911X_BASE
834 Define this to hold the physical address
835 of the device (I/O space)
836
837 CONFIG_DRIVER_SMC911X_32_BIT
838 Define this if data bus is 32 bits
839
840 CONFIG_DRIVER_SMC911X_16_BIT
841 Define this if data bus is 16 bits. If your processor
842 automatically converts one 32 bit word to two 16 bit
843 words you may also try CONFIG_DRIVER_SMC911X_32_BIT.
844
wdenkc6097192002-11-03 00:24:07 +0000845- USB Support:
846 At the moment only the UHCI host controller is
wdenk4d13cba2004-03-14 14:09:05 +0000847 supported (PIP405, MIP405, MPC5200); define
wdenkc6097192002-11-03 00:24:07 +0000848 CONFIG_USB_UHCI to enable it.
849 define CONFIG_USB_KEYBOARD to enable the USB Keyboard
wdenk30d56fa2004-10-09 22:44:59 +0000850 and define CONFIG_USB_STORAGE to enable the USB
wdenkc6097192002-11-03 00:24:07 +0000851 storage devices.
852 Note:
853 Supported are USB Keyboards and USB Floppy drives
854 (TEAC FD-05PUB).
wdenk4d13cba2004-03-14 14:09:05 +0000855 MPC5200 USB requires additional defines:
856 CONFIG_USB_CLOCK
857 for 528 MHz Clock: 0x0001bbbb
858 CONFIG_USB_CONFIG
859 for differential drivers: 0x00001000
860 for single ended drivers: 0x00005000
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200861 CONFIG_SYS_USB_EVENT_POLL
Zhang Weifdcfaa12007-06-06 10:08:13 +0200862 May be defined to allow interrupt polling
863 instead of using asynchronous interrupts
wdenk4d13cba2004-03-14 14:09:05 +0000864
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200865- USB Device:
866 Define the below if you wish to use the USB console.
867 Once firmware is rebuilt from a serial console issue the
868 command "setenv stdin usbtty; setenv stdout usbtty" and
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200869 attach your USB cable. The Unix command "dmesg" should print
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200870 it has found a new device. The environment variable usbtty
871 can be set to gserial or cdc_acm to enable your device to
Wolfgang Denk386eda02006-06-14 18:14:56 +0200872 appear to a USB host as a Linux gserial device or a
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200873 Common Device Class Abstract Control Model serial device.
874 If you select usbtty = gserial you should be able to enumerate
875 a Linux host by
876 # modprobe usbserial vendor=0xVendorID product=0xProductID
877 else if using cdc_acm, simply setting the environment
878 variable usbtty to be cdc_acm should suffice. The following
879 might be defined in YourBoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +0200880
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200881 CONFIG_USB_DEVICE
882 Define this to build a UDC device
wdenkc6097192002-11-03 00:24:07 +0000883
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200884 CONFIG_USB_TTY
885 Define this to have a tty type of device available to
886 talk to the UDC device
Wolfgang Denk386eda02006-06-14 18:14:56 +0200887
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200888 CONFIG_SYS_CONSOLE_IS_IN_ENV
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200889 Define this if you want stdin, stdout &/or stderr to
890 be set to usbtty.
891
892 mpc8xx:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200893 CONFIG_SYS_USB_EXTC_CLK 0xBLAH
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200894 Derive USB clock from external clock "blah"
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200895 - CONFIG_SYS_USB_EXTC_CLK 0x02
Wolfgang Denk386eda02006-06-14 18:14:56 +0200896
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200897 CONFIG_SYS_USB_BRG_CLK 0xBLAH
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200898 Derive USB clock from brgclk
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200899 - CONFIG_SYS_USB_BRG_CLK 0x04
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200900
Wolfgang Denk386eda02006-06-14 18:14:56 +0200901 If you have a USB-IF assigned VendorID then you may wish to
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200902 define your own vendor specific values either in BoardName.h
Wolfgang Denk386eda02006-06-14 18:14:56 +0200903 or directly in usbd_vendor_info.h. If you don't define
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200904 CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
905 CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
906 should pretend to be a Linux device to it's target host.
907
908 CONFIG_USBD_MANUFACTURER
909 Define this string as the name of your company for
910 - CONFIG_USBD_MANUFACTURER "my company"
Wolfgang Denk386eda02006-06-14 18:14:56 +0200911
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200912 CONFIG_USBD_PRODUCT_NAME
913 Define this string as the name of your product
914 - CONFIG_USBD_PRODUCT_NAME "acme usb device"
915
916 CONFIG_USBD_VENDORID
917 Define this as your assigned Vendor ID from the USB
918 Implementors Forum. This *must* be a genuine Vendor ID
919 to avoid polluting the USB namespace.
920 - CONFIG_USBD_VENDORID 0xFFFF
Wolfgang Denk386eda02006-06-14 18:14:56 +0200921
Wolfgang Denk16c8d5e2006-06-14 17:45:53 +0200922 CONFIG_USBD_PRODUCTID
923 Define this as the unique Product ID
924 for your device
925 - CONFIG_USBD_PRODUCTID 0xFFFF
wdenkc6097192002-11-03 00:24:07 +0000926
927
928- MMC Support:
929 The MMC controller on the Intel PXA is supported. To
930 enable this define CONFIG_MMC. The MMC can be
931 accessed from the boot prompt by mapping the device
932 to physical memory similar to flash. Command line is
Jon Loeliger602ad3b2007-06-11 19:03:39 -0500933 enabled with CONFIG_CMD_MMC. The MMC driver also works with
934 the FAT fs. This is enabled with CONFIG_CMD_FAT.
wdenkc6097192002-11-03 00:24:07 +0000935
wdenk6705d812004-08-02 23:22:59 +0000936- Journaling Flash filesystem support:
937 CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
938 CONFIG_JFFS2_NAND_DEV
939 Define these for a default partition on a NAND device
940
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200941 CONFIG_SYS_JFFS2_FIRST_SECTOR,
942 CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
wdenk6705d812004-08-02 23:22:59 +0000943 Define these for a default partition on a NOR device
944
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200945 CONFIG_SYS_JFFS_CUSTOM_PART
wdenk6705d812004-08-02 23:22:59 +0000946 Define this to create an own partition. You have to provide a
947 function struct part_info* jffs2_part_info(int part_num)
948
949 If you define only one JFFS2 partition you may also want to
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +0200950 #define CONFIG_SYS_JFFS_SINGLE_PART 1
wdenk6705d812004-08-02 23:22:59 +0000951 to disable the command chpart. This is the default when you
952 have not defined a custom partition
953
wdenkc6097192002-11-03 00:24:07 +0000954- Keyboard Support:
955 CONFIG_ISA_KEYBOARD
956
957 Define this to enable standard (PC-Style) keyboard
958 support
959
960 CONFIG_I8042_KBD
961 Standard PC keyboard driver with US (is default) and
962 GERMAN key layout (switch via environment 'keymap=de') support.
963 Export function i8042_kbd_init, i8042_tstc and i8042_getc
964 for cfb_console. Supports cursor blinking.
965
966- Video support:
967 CONFIG_VIDEO
968
969 Define this to enable video support (for output to
970 video).
971
972 CONFIG_VIDEO_CT69000
973
974 Enable Chips & Technologies 69000 Video chip
975
976 CONFIG_VIDEO_SMI_LYNXEM
wdenkb79a11c2004-03-25 15:14:43 +0000977 Enable Silicon Motion SMI 712/710/810 Video chip. The
wdenkeeb1b772004-03-23 22:53:55 +0000978 video output is selected via environment 'videoout'
979 (1 = LCD and 2 = CRT). If videoout is undefined, CRT is
980 assumed.
wdenkc6097192002-11-03 00:24:07 +0000981
wdenkb79a11c2004-03-25 15:14:43 +0000982 For the CT69000 and SMI_LYNXEM drivers, videomode is
Marcel Ziswiler11ccc332008-07-09 08:17:15 +0200983 selected via environment 'videomode'. Two different ways
wdenkeeb1b772004-03-23 22:53:55 +0000984 are possible:
985 - "videomode=num" 'num' is a standard LiLo mode numbers.
wdenk6e592382004-04-18 17:39:38 +0000986 Following standard modes are supported (* is default):
wdenkeeb1b772004-03-23 22:53:55 +0000987
988 Colors 640x480 800x600 1024x768 1152x864 1280x1024
989 -------------+---------------------------------------------
990 8 bits | 0x301* 0x303 0x305 0x161 0x307
991 15 bits | 0x310 0x313 0x316 0x162 0x319
992 16 bits | 0x311 0x314 0x317 0x163 0x31A
993 24 bits | 0x312 0x315 0x318 ? 0x31B
994 -------------+---------------------------------------------
wdenkc6097192002-11-03 00:24:07 +0000995 (i.e. setenv videomode 317; saveenv; reset;)
996
wdenkb79a11c2004-03-25 15:14:43 +0000997 - "videomode=bootargs" all the video parameters are parsed
Marcel Ziswiler7817cb22007-12-30 03:30:46 +0100998 from the bootargs. (See drivers/video/videomodes.c)
wdenkeeb1b772004-03-23 22:53:55 +0000999
1000
stroesec1551ea2003-04-04 15:53:41 +00001001 CONFIG_VIDEO_SED13806
wdenk43d96162003-03-06 00:02:04 +00001002 Enable Epson SED13806 driver. This driver supports 8bpp
wdenka6c7ad22002-12-03 21:28:10 +00001003 and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1004 or CONFIG_VIDEO_SED13806_16BPP
1005
wdenk682011f2003-06-03 23:54:09 +00001006- Keyboard Support:
wdenk8bde7f72003-06-27 21:31:46 +00001007 CONFIG_KEYBOARD
wdenk682011f2003-06-03 23:54:09 +00001008
wdenk8bde7f72003-06-27 21:31:46 +00001009 Define this to enable a custom keyboard support.
1010 This simply calls drv_keyboard_init() which must be
1011 defined in your board-specific files.
1012 The only board using this so far is RBC823.
wdenka6c7ad22002-12-03 21:28:10 +00001013
wdenkc6097192002-11-03 00:24:07 +00001014- LCD Support: CONFIG_LCD
1015
1016 Define this to enable LCD support (for output to LCD
1017 display); also select one of the supported displays
1018 by defining one of these:
1019
Stelian Pop39cf4802008-05-09 21:57:18 +02001020 CONFIG_ATMEL_LCD:
1021
1022 HITACHI TX09D70VM1CCA, 3.5", 240x320.
1023
wdenkfd3103b2003-11-25 16:55:19 +00001024 CONFIG_NEC_NL6448AC33:
wdenkc6097192002-11-03 00:24:07 +00001025
wdenkfd3103b2003-11-25 16:55:19 +00001026 NEC NL6448AC33-18. Active, color, single scan.
wdenkc6097192002-11-03 00:24:07 +00001027
wdenkfd3103b2003-11-25 16:55:19 +00001028 CONFIG_NEC_NL6448BC20
wdenkc6097192002-11-03 00:24:07 +00001029
wdenkfd3103b2003-11-25 16:55:19 +00001030 NEC NL6448BC20-08. 6.5", 640x480.
1031 Active, color, single scan.
1032
1033 CONFIG_NEC_NL6448BC33_54
1034
1035 NEC NL6448BC33-54. 10.4", 640x480.
wdenkc6097192002-11-03 00:24:07 +00001036 Active, color, single scan.
1037
1038 CONFIG_SHARP_16x9
1039
1040 Sharp 320x240. Active, color, single scan.
1041 It isn't 16x9, and I am not sure what it is.
1042
1043 CONFIG_SHARP_LQ64D341
1044
1045 Sharp LQ64D341 display, 640x480.
1046 Active, color, single scan.
1047
1048 CONFIG_HLD1045
1049
1050 HLD1045 display, 640x480.
1051 Active, color, single scan.
1052
1053 CONFIG_OPTREX_BW
1054
1055 Optrex CBL50840-2 NF-FW 99 22 M5
1056 or
1057 Hitachi LMG6912RPFC-00T
1058 or
1059 Hitachi SP14Q002
1060
1061 320x240. Black & white.
1062
1063 Normally display is black on white background; define
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001064 CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
wdenkc6097192002-11-03 00:24:07 +00001065
wdenk7152b1d2003-09-05 23:19:14 +00001066- Splash Screen Support: CONFIG_SPLASH_SCREEN
wdenkd791b1d2003-04-20 14:04:18 +00001067
wdenk8bde7f72003-06-27 21:31:46 +00001068 If this option is set, the environment is checked for
1069 a variable "splashimage". If found, the usual display
1070 of logo, copyright and system information on the LCD
wdenke94d2cd2004-06-30 22:59:18 +00001071 is suppressed and the BMP image at the address
wdenk8bde7f72003-06-27 21:31:46 +00001072 specified in "splashimage" is loaded instead. The
1073 console is redirected to the "nulldev", too. This
1074 allows for a "silent" boot where a splash screen is
1075 loaded very quickly after power-on.
wdenkd791b1d2003-04-20 14:04:18 +00001076
Stefan Roese98f4a3d2005-09-22 09:04:17 +02001077- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
1078
1079 If this option is set, additionally to standard BMP
1080 images, gzipped BMP images can be displayed via the
1081 splashscreen support or the bmp command.
1082
wdenkc29fdfc2003-08-29 20:57:53 +00001083- Compression support:
1084 CONFIG_BZIP2
1085
1086 If this option is set, support for bzip2 compressed
1087 images is included. If not, only uncompressed and gzip
1088 compressed images are supported.
1089
wdenk42d1f032003-10-15 23:53:47 +00001090 NOTE: the bzip2 algorithm requires a lot of RAM, so
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001091 the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
wdenk42d1f032003-10-15 23:53:47 +00001092 be at least 4MB.
wdenkd791b1d2003-04-20 14:04:18 +00001093
Luigi 'Comio' Mantellinifc9c1722008-09-08 02:46:13 +02001094 CONFIG_LZMA
1095
1096 If this option is set, support for lzma compressed
1097 images is included.
1098
1099 Note: The LZMA algorithm adds between 2 and 4KB of code and it
1100 requires an amount of dynamic memory that is given by the
1101 formula:
1102
1103 (1846 + 768 << (lc + lp)) * sizeof(uint16)
1104
1105 Where lc and lp stand for, respectively, Literal context bits
1106 and Literal pos bits.
1107
1108 This value is upper-bounded by 14MB in the worst case. Anyway,
1109 for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1110 total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1111 a very small buffer.
1112
1113 Use the lzmainfo tool to determinate the lc and lp values and
1114 then calculate the amount of needed dynamic memory (ensuring
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001115 the appropriate CONFIG_SYS_MALLOC_LEN value).
Luigi 'Comio' Mantellinifc9c1722008-09-08 02:46:13 +02001116
wdenk17ea1172004-06-06 21:51:03 +00001117- MII/PHY support:
1118 CONFIG_PHY_ADDR
1119
1120 The address of PHY on MII bus.
1121
1122 CONFIG_PHY_CLOCK_FREQ (ppc4xx)
1123
1124 The clock frequency of the MII bus
1125
1126 CONFIG_PHY_GIGE
1127
1128 If this option is set, support for speed/duplex
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001129 detection of gigabit PHY is included.
wdenk17ea1172004-06-06 21:51:03 +00001130
1131 CONFIG_PHY_RESET_DELAY
1132
1133 Some PHY like Intel LXT971A need extra delay after
1134 reset before any MII register access is possible.
1135 For such PHY, set this option to the usec delay
1136 required. (minimum 300usec for LXT971A)
1137
1138 CONFIG_PHY_CMD_DELAY (ppc4xx)
1139
1140 Some PHY like Intel LXT971A need extra delay after
1141 command issued before MII status register can be read
1142
wdenkc6097192002-11-03 00:24:07 +00001143- Ethernet address:
1144 CONFIG_ETHADDR
richardretanubunc68a05f2008-09-29 18:28:23 -04001145 CONFIG_ETH1ADDR
wdenkc6097192002-11-03 00:24:07 +00001146 CONFIG_ETH2ADDR
1147 CONFIG_ETH3ADDR
richardretanubunc68a05f2008-09-29 18:28:23 -04001148 CONFIG_ETH4ADDR
1149 CONFIG_ETH5ADDR
wdenkc6097192002-11-03 00:24:07 +00001150
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001151 Define a default value for Ethernet address to use
1152 for the respective Ethernet interface, in case this
wdenkc6097192002-11-03 00:24:07 +00001153 is not determined automatically.
1154
1155- IP address:
1156 CONFIG_IPADDR
1157
1158 Define a default value for the IP address to use for
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001159 the default Ethernet interface, in case this is not
wdenkc6097192002-11-03 00:24:07 +00001160 determined through e.g. bootp.
1161
1162- Server IP address:
1163 CONFIG_SERVERIP
1164
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001165 Defines a default value for the IP address of a TFTP
wdenkc6097192002-11-03 00:24:07 +00001166 server to contact when using the "tftboot" command.
1167
David Updegraff53a5c422007-06-11 10:41:07 -05001168- Multicast TFTP Mode:
1169 CONFIG_MCAST_TFTP
1170
1171 Defines whether you want to support multicast TFTP as per
1172 rfc-2090; for example to work with atftp. Lets lots of targets
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001173 tftp down the same boot image concurrently. Note: the Ethernet
David Updegraff53a5c422007-06-11 10:41:07 -05001174 driver in use must provide a function: mcast() to join/leave a
1175 multicast group.
1176
1177 CONFIG_BOOTP_RANDOM_DELAY
wdenkc6097192002-11-03 00:24:07 +00001178- BOOTP Recovery Mode:
1179 CONFIG_BOOTP_RANDOM_DELAY
1180
1181 If you have many targets in a network that try to
1182 boot using BOOTP, you may want to avoid that all
1183 systems send out BOOTP requests at precisely the same
1184 moment (which would happen for instance at recovery
1185 from a power failure, when all systems will try to
1186 boot, thus flooding the BOOTP server. Defining
1187 CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1188 inserted before sending out BOOTP requests. The
Wolfgang Denk6c33c782007-08-06 23:21:05 +02001189 following delays are inserted then:
wdenkc6097192002-11-03 00:24:07 +00001190
1191 1st BOOTP request: delay 0 ... 1 sec
1192 2nd BOOTP request: delay 0 ... 2 sec
1193 3rd BOOTP request: delay 0 ... 4 sec
1194 4th and following
1195 BOOTP requests: delay 0 ... 8 sec
1196
stroesefe389a82003-08-28 14:17:32 +00001197- DHCP Advanced Options:
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001198 You can fine tune the DHCP functionality by defining
1199 CONFIG_BOOTP_* symbols:
stroesefe389a82003-08-28 14:17:32 +00001200
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001201 CONFIG_BOOTP_SUBNETMASK
1202 CONFIG_BOOTP_GATEWAY
1203 CONFIG_BOOTP_HOSTNAME
1204 CONFIG_BOOTP_NISDOMAIN
1205 CONFIG_BOOTP_BOOTPATH
1206 CONFIG_BOOTP_BOOTFILESIZE
1207 CONFIG_BOOTP_DNS
1208 CONFIG_BOOTP_DNS2
1209 CONFIG_BOOTP_SEND_HOSTNAME
1210 CONFIG_BOOTP_NTPSERVER
1211 CONFIG_BOOTP_TIMEOFFSET
1212 CONFIG_BOOTP_VENDOREX
stroesefe389a82003-08-28 14:17:32 +00001213
Wilson Callan5d110f02007-07-28 10:56:13 -04001214 CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
1215 environment variable, not the BOOTP server.
stroesefe389a82003-08-28 14:17:32 +00001216
1217 CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1218 serverip from a DHCP server, it is possible that more
1219 than one DNS serverip is offered to the client.
1220 If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1221 serverip will be stored in the additional environment
1222 variable "dnsip2". The first DNS serverip is always
1223 stored in the variable "dnsip", when CONFIG_BOOTP_DNS
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001224 is defined.
stroesefe389a82003-08-28 14:17:32 +00001225
1226 CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1227 to do a dynamic update of a DNS server. To do this, they
1228 need the hostname of the DHCP requester.
Wilson Callan5d110f02007-07-28 10:56:13 -04001229 If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
Jon Loeliger1fe80d72007-07-09 22:08:34 -05001230 of the "hostname" environment variable is passed as
1231 option 12 to the DHCP server.
stroesefe389a82003-08-28 14:17:32 +00001232
Aras Vaichasd9a2f412008-03-26 09:43:57 +11001233 CONFIG_BOOTP_DHCP_REQUEST_DELAY
1234
1235 A 32bit value in microseconds for a delay between
1236 receiving a "DHCP Offer" and sending the "DHCP Request".
1237 This fixes a problem with certain DHCP servers that don't
1238 respond 100% of the time to a "DHCP request". E.g. On an
1239 AT91RM9200 processor running at 180MHz, this delay needed
1240 to be *at least* 15,000 usec before a Windows Server 2003
1241 DHCP server would reply 100% of the time. I recommend at
1242 least 50,000 usec to be safe. The alternative is to hope
1243 that one of the retries will be successful but note that
1244 the DHCP timeout and retry process takes a longer than
1245 this delay.
1246
wdenka3d991b2004-04-15 21:48:45 +00001247 - CDP Options:
wdenk6e592382004-04-18 17:39:38 +00001248 CONFIG_CDP_DEVICE_ID
wdenka3d991b2004-04-15 21:48:45 +00001249
1250 The device id used in CDP trigger frames.
1251
1252 CONFIG_CDP_DEVICE_ID_PREFIX
1253
1254 A two character string which is prefixed to the MAC address
1255 of the device.
1256
1257 CONFIG_CDP_PORT_ID
1258
1259 A printf format string which contains the ascii name of
1260 the port. Normally is set to "eth%d" which sets
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001261 eth0 for the first Ethernet, eth1 for the second etc.
wdenka3d991b2004-04-15 21:48:45 +00001262
1263 CONFIG_CDP_CAPABILITIES
1264
1265 A 32bit integer which indicates the device capabilities;
1266 0x00000010 for a normal host which does not forwards.
1267
1268 CONFIG_CDP_VERSION
1269
1270 An ascii string containing the version of the software.
1271
1272 CONFIG_CDP_PLATFORM
1273
1274 An ascii string containing the name of the platform.
1275
1276 CONFIG_CDP_TRIGGER
1277
1278 A 32bit integer sent on the trigger.
1279
1280 CONFIG_CDP_POWER_CONSUMPTION
1281
1282 A 16bit integer containing the power consumption of the
1283 device in .1 of milliwatts.
1284
1285 CONFIG_CDP_APPLIANCE_VLAN_TYPE
1286
1287 A byte containing the id of the VLAN.
1288
wdenkc6097192002-11-03 00:24:07 +00001289- Status LED: CONFIG_STATUS_LED
1290
1291 Several configurations allow to display the current
1292 status using a LED. For instance, the LED will blink
1293 fast while running U-Boot code, stop blinking as
1294 soon as a reply to a BOOTP request was received, and
1295 start blinking slow once the Linux kernel is running
1296 (supported by a status LED driver in the Linux
1297 kernel). Defining CONFIG_STATUS_LED enables this
1298 feature in U-Boot.
1299
1300- CAN Support: CONFIG_CAN_DRIVER
1301
1302 Defining CONFIG_CAN_DRIVER enables CAN driver support
1303 on those systems that support this (optional)
1304 feature, like the TQM8xxL modules.
1305
1306- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1307
wdenkb37c7e52003-06-30 16:24:52 +00001308 These enable I2C serial bus commands. Defining either of
wdenk945af8d2003-07-16 21:53:01 +00001309 (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001310 include the appropriate I2C driver for the selected CPU.
wdenkc6097192002-11-03 00:24:07 +00001311
wdenk945af8d2003-07-16 21:53:01 +00001312 This will allow you to use i2c commands at the u-boot
Jon Loeliger602ad3b2007-06-11 19:03:39 -05001313 command line (as long as you set CONFIG_CMD_I2C in
wdenkb37c7e52003-06-30 16:24:52 +00001314 CONFIG_COMMANDS) and communicate with i2c based realtime
1315 clock chips. See common/cmd_i2c.c for a description of the
wdenk43d96162003-03-06 00:02:04 +00001316 command line interface.
wdenkc6097192002-11-03 00:24:07 +00001317
Ben Warrenbb99ad62006-09-07 16:50:54 -04001318 CONFIG_HARD_I2C selects a hardware I2C controller.
wdenkc6097192002-11-03 00:24:07 +00001319
wdenk945af8d2003-07-16 21:53:01 +00001320 CONFIG_SOFT_I2C configures u-boot to use a software (aka
wdenkb37c7e52003-06-30 16:24:52 +00001321 bit-banging) driver instead of CPM or similar hardware
1322 support for I2C.
wdenkc6097192002-11-03 00:24:07 +00001323
wdenk945af8d2003-07-16 21:53:01 +00001324 There are several other quantities that must also be
wdenkb37c7e52003-06-30 16:24:52 +00001325 defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
wdenkc6097192002-11-03 00:24:07 +00001326
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001327 In both cases you will need to define CONFIG_SYS_I2C_SPEED
wdenk945af8d2003-07-16 21:53:01 +00001328 to be the frequency (in Hz) at which you wish your i2c bus
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001329 to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001330 the CPU's i2c node address).
wdenk945af8d2003-07-16 21:53:01 +00001331
wdenkb37c7e52003-06-30 16:24:52 +00001332 Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001333 sets the CPU up as a master node and so its address should
wdenkb37c7e52003-06-30 16:24:52 +00001334 therefore be cleared to 0 (See, eg, MPC823e User's Manual
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001335 p.16-473). So, set CONFIG_SYS_I2C_SLAVE to 0.
wdenkc6097192002-11-03 00:24:07 +00001336
wdenk945af8d2003-07-16 21:53:01 +00001337 That's all that's required for CONFIG_HARD_I2C.
wdenkb37c7e52003-06-30 16:24:52 +00001338
1339 If you use the software i2c interface (CONFIG_SOFT_I2C)
1340 then the following macros need to be defined (examples are
1341 from include/configs/lwmon.h):
wdenkc6097192002-11-03 00:24:07 +00001342
1343 I2C_INIT
1344
wdenkb37c7e52003-06-30 16:24:52 +00001345 (Optional). Any commands necessary to enable the I2C
wdenk43d96162003-03-06 00:02:04 +00001346 controller or configure ports.
wdenkc6097192002-11-03 00:24:07 +00001347
wdenkba56f622004-02-06 23:19:44 +00001348 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
wdenkb37c7e52003-06-30 16:24:52 +00001349
wdenkc6097192002-11-03 00:24:07 +00001350 I2C_PORT
1351
wdenk43d96162003-03-06 00:02:04 +00001352 (Only for MPC8260 CPU). The I/O port to use (the code
1353 assumes both bits are on the same port). Valid values
1354 are 0..3 for ports A..D.
wdenkc6097192002-11-03 00:24:07 +00001355
1356 I2C_ACTIVE
1357
1358 The code necessary to make the I2C data line active
1359 (driven). If the data line is open collector, this
1360 define can be null.
1361
wdenkb37c7e52003-06-30 16:24:52 +00001362 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
1363
wdenkc6097192002-11-03 00:24:07 +00001364 I2C_TRISTATE
1365
1366 The code necessary to make the I2C data line tri-stated
1367 (inactive). If the data line is open collector, this
1368 define can be null.
1369
wdenkb37c7e52003-06-30 16:24:52 +00001370 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1371
wdenkc6097192002-11-03 00:24:07 +00001372 I2C_READ
1373
1374 Code that returns TRUE if the I2C data line is high,
1375 FALSE if it is low.
1376
wdenkb37c7e52003-06-30 16:24:52 +00001377 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1378
wdenkc6097192002-11-03 00:24:07 +00001379 I2C_SDA(bit)
1380
1381 If <bit> is TRUE, sets the I2C data line high. If it
1382 is FALSE, it clears it (low).
1383
wdenkb37c7e52003-06-30 16:24:52 +00001384 eg: #define I2C_SDA(bit) \
wdenk2535d602003-07-17 23:16:40 +00001385 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
wdenkba56f622004-02-06 23:19:44 +00001386 else immr->im_cpm.cp_pbdat &= ~PB_SDA
wdenkb37c7e52003-06-30 16:24:52 +00001387
wdenkc6097192002-11-03 00:24:07 +00001388 I2C_SCL(bit)
1389
1390 If <bit> is TRUE, sets the I2C clock line high. If it
1391 is FALSE, it clears it (low).
1392
wdenkb37c7e52003-06-30 16:24:52 +00001393 eg: #define I2C_SCL(bit) \
wdenk2535d602003-07-17 23:16:40 +00001394 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
wdenkba56f622004-02-06 23:19:44 +00001395 else immr->im_cpm.cp_pbdat &= ~PB_SCL
wdenkb37c7e52003-06-30 16:24:52 +00001396
wdenkc6097192002-11-03 00:24:07 +00001397 I2C_DELAY
1398
1399 This delay is invoked four times per clock cycle so this
1400 controls the rate of data transfer. The data rate thus
wdenkb37c7e52003-06-30 16:24:52 +00001401 is 1 / (I2C_DELAY * 4). Often defined to be something
wdenk945af8d2003-07-16 21:53:01 +00001402 like:
1403
wdenkb37c7e52003-06-30 16:24:52 +00001404 #define I2C_DELAY udelay(2)
wdenkc6097192002-11-03 00:24:07 +00001405
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001406 CONFIG_SYS_I2C_INIT_BOARD
wdenk47cd00f2003-03-06 13:39:27 +00001407
wdenk8bde7f72003-06-27 21:31:46 +00001408 When a board is reset during an i2c bus transfer
1409 chips might think that the current transfer is still
1410 in progress. On some boards it is possible to access
1411 the i2c SCLK line directly, either by using the
1412 processor pin as a GPIO or by having a second pin
1413 connected to the bus. If this option is defined a
1414 custom i2c_init_board() routine in boards/xxx/board.c
1415 is run early in the boot sequence.
wdenk47cd00f2003-03-06 13:39:27 +00001416
wdenk17ea1172004-06-06 21:51:03 +00001417 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
1418
1419 This option enables configuration of bi_iic_fast[] flags
1420 in u-boot bd_info structure based on u-boot environment
1421 variable "i2cfast". (see also i2cfast)
1422
Ben Warrenbb99ad62006-09-07 16:50:54 -04001423 CONFIG_I2C_MULTI_BUS
1424
1425 This option allows the use of multiple I2C buses, each of which
1426 must have a controller. At any point in time, only one bus is
1427 active. To switch to a different bus, use the 'i2c dev' command.
1428 Note that bus numbering is zero-based.
1429
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001430 CONFIG_SYS_I2C_NOPROBES
Ben Warrenbb99ad62006-09-07 16:50:54 -04001431
1432 This option specifies a list of I2C devices that will be skipped
Peter Tyser0f89c542009-04-18 22:34:03 -05001433 when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS
1434 is set, specify a list of bus-device pairs. Otherwise, specify
1435 a 1D array of device addresses
Ben Warrenbb99ad62006-09-07 16:50:54 -04001436
1437 e.g.
1438 #undef CONFIG_I2C_MULTI_BUS
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001439 #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
Ben Warrenbb99ad62006-09-07 16:50:54 -04001440
1441 will skip addresses 0x50 and 0x68 on a board with one I2C bus
1442
1443 #define CONFIG_I2C_MULTI_BUS
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001444 #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
Ben Warrenbb99ad62006-09-07 16:50:54 -04001445
1446 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1447
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001448 CONFIG_SYS_SPD_BUS_NUM
Timur Tabibe5e6182006-11-03 19:15:00 -06001449
1450 If defined, then this indicates the I2C bus number for DDR SPD.
1451 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1452
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001453 CONFIG_SYS_RTC_BUS_NUM
Stefan Roese0dc018e2007-02-20 10:51:26 +01001454
1455 If defined, then this indicates the I2C bus number for the RTC.
1456 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
1457
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001458 CONFIG_SYS_DTT_BUS_NUM
Stefan Roese0dc018e2007-02-20 10:51:26 +01001459
1460 If defined, then this indicates the I2C bus number for the DTT.
1461 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
1462
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001463 CONFIG_SYS_I2C_DTT_ADDR:
Victor Gallardo9ebbb542008-09-09 15:13:29 -07001464
1465 If defined, specifies the I2C address of the DTT device.
1466 If not defined, then U-Boot uses predefined value for
1467 specified DTT device.
1468
Timur Tabibe5e6182006-11-03 19:15:00 -06001469 CONFIG_FSL_I2C
1470
1471 Define this option if you want to use Freescale's I2C driver in
Marcel Ziswiler7817cb22007-12-30 03:30:46 +01001472 drivers/i2c/fsl_i2c.c.
Timur Tabibe5e6182006-11-03 19:15:00 -06001473
Heiko Schocher67b23a32008-10-15 09:39:47 +02001474 CONFIG_I2C_MUX
1475
1476 Define this option if you have I2C devices reached over 1 .. n
1477 I2C Muxes like the pca9544a. This option addes a new I2C
1478 Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
1479 new I2C Bus to the existing I2C Busses. If you select the
1480 new Bus with "i2c dev", u-bbot sends first the commandos for
1481 the muxes to activate this new "bus".
1482
1483 CONFIG_I2C_MULTI_BUS must be also defined, to use this
1484 feature!
1485
1486 Example:
1487 Adding a new I2C Bus reached over 2 pca9544a muxes
1488 The First mux with address 70 and channel 6
1489 The Second mux with address 71 and channel 4
1490
1491 => i2c bus pca9544a:70:6:pca9544a:71:4
1492
1493 Use the "i2c bus" command without parameter, to get a list
1494 of I2C Busses with muxes:
1495
1496 => i2c bus
1497 Busses reached over muxes:
1498 Bus ID: 2
1499 reached over Mux(es):
1500 pca9544a@70 ch: 4
1501 Bus ID: 3
1502 reached over Mux(es):
1503 pca9544a@70 ch: 6
1504 pca9544a@71 ch: 4
1505 =>
1506
1507 If you now switch to the new I2C Bus 3 with "i2c dev 3"
1508 u-boot sends First the Commando to the mux@70 to enable
1509 channel 6, and then the Commando to the mux@71 to enable
1510 the channel 4.
1511
1512 After that, you can use the "normal" i2c commands as
1513 usual, to communicate with your I2C devices behind
1514 the 2 muxes.
1515
1516 This option is actually implemented for the bitbanging
1517 algorithm in common/soft_i2c.c and for the Hardware I2C
1518 Bus on the MPC8260. But it should be not so difficult
1519 to add this option to other architectures.
1520
Andrew Dyer2ac69852008-12-29 17:36:01 -06001521 CONFIG_SOFT_I2C_READ_REPEATED_START
1522
1523 defining this will force the i2c_read() function in
1524 the soft_i2c driver to perform an I2C repeated start
1525 between writing the address pointer and reading the
1526 data. If this define is omitted the default behaviour
1527 of doing a stop-start sequence will be used. Most I2C
1528 devices can use either method, but some require one or
1529 the other.
Timur Tabibe5e6182006-11-03 19:15:00 -06001530
wdenkc6097192002-11-03 00:24:07 +00001531- SPI Support: CONFIG_SPI
1532
1533 Enables SPI driver (so far only tested with
1534 SPI EEPROM, also an instance works with Crystal A/D and
1535 D/As on the SACSng board)
1536
1537 CONFIG_SPI_X
1538
1539 Enables extended (16-bit) SPI EEPROM addressing.
1540 (symmetrical to CONFIG_I2C_X)
1541
1542 CONFIG_SOFT_SPI
1543
wdenk43d96162003-03-06 00:02:04 +00001544 Enables a software (bit-bang) SPI driver rather than
1545 using hardware support. This is a general purpose
1546 driver that only requires three general I/O port pins
1547 (two outputs, one input) to function. If this is
1548 defined, the board configuration must define several
1549 SPI configuration items (port pins to use, etc). For
1550 an example, see include/configs/sacsng.h.
wdenkc6097192002-11-03 00:24:07 +00001551
Ben Warren04a9e112008-01-16 22:37:35 -05001552 CONFIG_HARD_SPI
1553
1554 Enables a hardware SPI driver for general-purpose reads
1555 and writes. As with CONFIG_SOFT_SPI, the board configuration
1556 must define a list of chip-select function pointers.
1557 Currently supported on some MPC8xxx processors. For an
1558 example, see include/configs/mpc8349emds.h.
1559
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +02001560 CONFIG_MXC_SPI
1561
1562 Enables the driver for the SPI controllers on i.MX and MXC
1563 SoCs. Currently only i.MX31 is supported.
1564
Matthias Fuchs01335022007-12-27 17:12:34 +01001565- FPGA Support: CONFIG_FPGA
1566
1567 Enables FPGA subsystem.
1568
1569 CONFIG_FPGA_<vendor>
1570
1571 Enables support for specific chip vendors.
1572 (ALTERA, XILINX)
1573
1574 CONFIG_FPGA_<family>
1575
1576 Enables support for FPGA family.
1577 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
1578
1579 CONFIG_FPGA_COUNT
wdenkc6097192002-11-03 00:24:07 +00001580
wdenk43d96162003-03-06 00:02:04 +00001581 Specify the number of FPGA devices to support.
wdenkc6097192002-11-03 00:24:07 +00001582
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001583 CONFIG_SYS_FPGA_PROG_FEEDBACK
wdenkc6097192002-11-03 00:24:07 +00001584
wdenk8bde7f72003-06-27 21:31:46 +00001585 Enable printing of hash marks during FPGA configuration.
wdenkc6097192002-11-03 00:24:07 +00001586
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001587 CONFIG_SYS_FPGA_CHECK_BUSY
wdenkc6097192002-11-03 00:24:07 +00001588
wdenk43d96162003-03-06 00:02:04 +00001589 Enable checks on FPGA configuration interface busy
1590 status by the configuration function. This option
1591 will require a board or device specific function to
1592 be written.
wdenkc6097192002-11-03 00:24:07 +00001593
1594 CONFIG_FPGA_DELAY
1595
1596 If defined, a function that provides delays in the FPGA
1597 configuration driver.
1598
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001599 CONFIG_SYS_FPGA_CHECK_CTRLC
wdenkc6097192002-11-03 00:24:07 +00001600 Allow Control-C to interrupt FPGA configuration
1601
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001602 CONFIG_SYS_FPGA_CHECK_ERROR
wdenkc6097192002-11-03 00:24:07 +00001603
wdenk43d96162003-03-06 00:02:04 +00001604 Check for configuration errors during FPGA bitfile
1605 loading. For example, abort during Virtex II
1606 configuration if the INIT_B line goes low (which
1607 indicated a CRC error).
wdenkc6097192002-11-03 00:24:07 +00001608
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001609 CONFIG_SYS_FPGA_WAIT_INIT
wdenkc6097192002-11-03 00:24:07 +00001610
wdenk43d96162003-03-06 00:02:04 +00001611 Maximum time to wait for the INIT_B line to deassert
1612 after PROB_B has been deasserted during a Virtex II
1613 FPGA configuration sequence. The default time is 500
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001614 ms.
wdenkc6097192002-11-03 00:24:07 +00001615
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001616 CONFIG_SYS_FPGA_WAIT_BUSY
wdenkc6097192002-11-03 00:24:07 +00001617
wdenk43d96162003-03-06 00:02:04 +00001618 Maximum time to wait for BUSY to deassert during
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001619 Virtex II FPGA configuration. The default is 5 ms.
wdenkc6097192002-11-03 00:24:07 +00001620
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001621 CONFIG_SYS_FPGA_WAIT_CONFIG
wdenkc6097192002-11-03 00:24:07 +00001622
wdenk43d96162003-03-06 00:02:04 +00001623 Time to wait after FPGA configuration. The default is
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001624 200 ms.
wdenkc6097192002-11-03 00:24:07 +00001625
1626- Configuration Management:
1627 CONFIG_IDENT_STRING
1628
wdenk43d96162003-03-06 00:02:04 +00001629 If defined, this string will be added to the U-Boot
1630 version information (U_BOOT_VERSION)
wdenkc6097192002-11-03 00:24:07 +00001631
1632- Vendor Parameter Protection:
1633
wdenk43d96162003-03-06 00:02:04 +00001634 U-Boot considers the values of the environment
1635 variables "serial#" (Board Serial Number) and
wdenk7152b1d2003-09-05 23:19:14 +00001636 "ethaddr" (Ethernet Address) to be parameters that
wdenk43d96162003-03-06 00:02:04 +00001637 are set once by the board vendor / manufacturer, and
1638 protects these variables from casual modification by
1639 the user. Once set, these variables are read-only,
1640 and write or delete attempts are rejected. You can
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001641 change this behaviour:
wdenkc6097192002-11-03 00:24:07 +00001642
1643 If CONFIG_ENV_OVERWRITE is #defined in your config
1644 file, the write protection for vendor parameters is
wdenk47cd00f2003-03-06 13:39:27 +00001645 completely disabled. Anybody can change or delete
wdenkc6097192002-11-03 00:24:07 +00001646 these parameters.
1647
1648 Alternatively, if you #define _both_ CONFIG_ETHADDR
1649 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001650 Ethernet address is installed in the environment,
wdenkc6097192002-11-03 00:24:07 +00001651 which can be changed exactly ONCE by the user. [The
1652 serial# is unaffected by this, i. e. it remains
1653 read-only.]
1654
1655- Protected RAM:
1656 CONFIG_PRAM
1657
1658 Define this variable to enable the reservation of
1659 "protected RAM", i. e. RAM which is not overwritten
1660 by U-Boot. Define CONFIG_PRAM to hold the number of
1661 kB you want to reserve for pRAM. You can overwrite
1662 this default value by defining an environment
1663 variable "pram" to the number of kB you want to
1664 reserve. Note that the board info structure will
1665 still show the full amount of RAM. If pRAM is
1666 reserved, a new environment variable "mem" will
1667 automatically be defined to hold the amount of
1668 remaining RAM in a form that can be passed as boot
1669 argument to Linux, for instance like that:
1670
Wolfgang Denkfe126d82005-11-20 21:40:11 +01001671 setenv bootargs ... mem=\${mem}
wdenkc6097192002-11-03 00:24:07 +00001672 saveenv
1673
1674 This way you can tell Linux not to use this memory,
1675 either, which results in a memory region that will
1676 not be affected by reboots.
1677
1678 *WARNING* If your board configuration uses automatic
1679 detection of the RAM size, you must make sure that
1680 this memory test is non-destructive. So far, the
1681 following board configurations are known to be
1682 "pRAM-clean":
1683
1684 ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1685 HERMES, IP860, RPXlite, LWMON, LANTEC,
1686 PCU_E, FLAGADM, TQM8260
1687
1688- Error Recovery:
1689 CONFIG_PANIC_HANG
1690
1691 Define this variable to stop the system in case of a
1692 fatal error, so that you have to reset it manually.
1693 This is probably NOT a good idea for an embedded
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001694 system where you want the system to reboot
wdenkc6097192002-11-03 00:24:07 +00001695 automatically as fast as possible, but it may be
1696 useful during development since you can try to debug
1697 the conditions that lead to the situation.
1698
1699 CONFIG_NET_RETRY_COUNT
1700
wdenk43d96162003-03-06 00:02:04 +00001701 This variable defines the number of retries for
1702 network operations like ARP, RARP, TFTP, or BOOTP
1703 before giving up the operation. If not defined, a
1704 default value of 5 is used.
wdenkc6097192002-11-03 00:24:07 +00001705
Guennadi Liakhovetski40cb90e2008-04-03 17:04:19 +02001706 CONFIG_ARP_TIMEOUT
1707
1708 Timeout waiting for an ARP reply in milliseconds.
1709
wdenkc6097192002-11-03 00:24:07 +00001710- Command Interpreter:
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001711 CONFIG_AUTO_COMPLETE
wdenk04a85b32004-04-15 18:22:41 +00001712
1713 Enable auto completion of commands using TAB.
1714
Wolfgang Denka9398e02006-11-27 15:32:42 +01001715 Note that this feature has NOT been implemented yet
1716 for the "hush" shell.
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001717
1718
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001719 CONFIG_SYS_HUSH_PARSER
wdenkc6097192002-11-03 00:24:07 +00001720
1721 Define this variable to enable the "hush" shell (from
1722 Busybox) as command line interpreter, thus enabling
1723 powerful command line syntax like
1724 if...then...else...fi conditionals or `&&' and '||'
1725 constructs ("shell scripts").
1726
1727 If undefined, you get the old, much simpler behaviour
1728 with a somewhat smaller memory footprint.
1729
1730
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001731 CONFIG_SYS_PROMPT_HUSH_PS2
wdenkc6097192002-11-03 00:24:07 +00001732
1733 This defines the secondary prompt string, which is
1734 printed when the command interpreter needs more input
1735 to complete a command. Usually "> ".
1736
1737 Note:
1738
wdenk8bde7f72003-06-27 21:31:46 +00001739 In the current implementation, the local variables
1740 space and global environment variables space are
1741 separated. Local variables are those you define by
1742 simply typing `name=value'. To access a local
1743 variable later on, you have write `$name' or
1744 `${name}'; to execute the contents of a variable
1745 directly type `$name' at the command prompt.
wdenkc6097192002-11-03 00:24:07 +00001746
wdenk43d96162003-03-06 00:02:04 +00001747 Global environment variables are those you use
1748 setenv/printenv to work with. To run a command stored
1749 in such a variable, you need to use the run command,
1750 and you must not use the '$' sign to access them.
wdenkc6097192002-11-03 00:24:07 +00001751
1752 To store commands and special characters in a
1753 variable, please use double quotation marks
1754 surrounding the whole text of the variable, instead
1755 of the backslashes before semicolons and special
1756 symbols.
1757
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001758- Commandline Editing and History:
1759 CONFIG_CMDLINE_EDITING
1760
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001761 Enable editing and History functions for interactive
Wolfgang Denkb9365a22006-07-21 11:56:05 +02001762 commandline input operations
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001763
wdenka8c7c702003-12-06 19:49:23 +00001764- Default Environment:
wdenkc6097192002-11-03 00:24:07 +00001765 CONFIG_EXTRA_ENV_SETTINGS
1766
wdenk43d96162003-03-06 00:02:04 +00001767 Define this to contain any number of null terminated
1768 strings (variable = value pairs) that will be part of
wdenk7152b1d2003-09-05 23:19:14 +00001769 the default environment compiled into the boot image.
wdenk2262cfe2002-11-18 00:14:45 +00001770
wdenk43d96162003-03-06 00:02:04 +00001771 For example, place something like this in your
1772 board's config file:
wdenkc6097192002-11-03 00:24:07 +00001773
1774 #define CONFIG_EXTRA_ENV_SETTINGS \
1775 "myvar1=value1\0" \
1776 "myvar2=value2\0"
1777
wdenk43d96162003-03-06 00:02:04 +00001778 Warning: This method is based on knowledge about the
1779 internal format how the environment is stored by the
1780 U-Boot code. This is NOT an official, exported
1781 interface! Although it is unlikely that this format
wdenk7152b1d2003-09-05 23:19:14 +00001782 will change soon, there is no guarantee either.
wdenkc6097192002-11-03 00:24:07 +00001783 You better know what you are doing here.
1784
wdenk43d96162003-03-06 00:02:04 +00001785 Note: overly (ab)use of the default environment is
1786 discouraged. Make sure to check other ways to preset
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02001787 the environment like the "source" command or the
wdenk43d96162003-03-06 00:02:04 +00001788 boot command first.
wdenkc6097192002-11-03 00:24:07 +00001789
wdenka8c7c702003-12-06 19:49:23 +00001790- DataFlash Support:
wdenk2abbe072003-06-16 23:50:08 +00001791 CONFIG_HAS_DATAFLASH
1792
wdenk8bde7f72003-06-27 21:31:46 +00001793 Defining this option enables DataFlash features and
1794 allows to read/write in Dataflash via the standard
1795 commands cp, md...
wdenk2abbe072003-06-16 23:50:08 +00001796
wdenk3f85ce22004-02-23 16:11:30 +00001797- SystemACE Support:
1798 CONFIG_SYSTEMACE
1799
1800 Adding this option adds support for Xilinx SystemACE
1801 chips attached via some sort of local bus. The address
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001802 of the chip must also be defined in the
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001803 CONFIG_SYS_SYSTEMACE_BASE macro. For example:
wdenk3f85ce22004-02-23 16:11:30 +00001804
1805 #define CONFIG_SYSTEMACE
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001806 #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
wdenk3f85ce22004-02-23 16:11:30 +00001807
1808 When SystemACE support is added, the "ace" device type
1809 becomes available to the fat commands, i.e. fatls.
1810
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001811- TFTP Fixed UDP Port:
1812 CONFIG_TFTP_PORT
1813
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001814 If this is defined, the environment variable tftpsrcp
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001815 is used to supply the TFTP UDP source port value.
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001816 If tftpsrcp isn't defined, the normal pseudo-random port
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001817 number generator is used.
1818
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001819 Also, the environment variable tftpdstp is used to supply
1820 the TFTP UDP destination port value. If tftpdstp isn't
1821 defined, the normal port 69 is used.
1822
1823 The purpose for tftpsrcp is to allow a TFTP server to
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001824 blindly start the TFTP transfer using the pre-configured
1825 target IP address and UDP port. This has the effect of
1826 "punching through" the (Windows XP) firewall, allowing
1827 the remainder of the TFTP transfer to proceed normally.
1828 A better solution is to properly configure the firewall,
1829 but sometimes that is not allowed.
1830
wdenka8c7c702003-12-06 19:49:23 +00001831- Show boot progress:
wdenkc6097192002-11-03 00:24:07 +00001832 CONFIG_SHOW_BOOT_PROGRESS
1833
wdenk43d96162003-03-06 00:02:04 +00001834 Defining this option allows to add some board-
1835 specific code (calling a user-provided function
1836 "show_boot_progress(int)") that enables you to show
1837 the system's boot progress on some display (for
1838 example, some LED's) on your board. At the moment,
1839 the following checkpoints are implemented:
wdenkc6097192002-11-03 00:24:07 +00001840
Bartlomiej Sieka4bae9092008-10-01 15:26:31 +02001841- Automatic software updates via TFTP server
1842 CONFIG_UPDATE_TFTP
1843 CONFIG_UPDATE_TFTP_CNT_MAX
1844 CONFIG_UPDATE_TFTP_MSEC_MAX
1845
1846 These options enable and control the auto-update feature;
1847 for a more detailed description refer to doc/README.update.
1848
Stefan Roesed5581072009-05-12 14:31:18 +02001849- MTD Support (mtdparts command, UBI support)
1850 CONFIG_MTD_DEVICE
1851
1852 Adds the MTD device infrastructure from the Linux kernel.
1853 Needed for mtdparts command support.
1854
1855 CONFIG_MTD_PARTITIONS
1856
1857 Adds the MTD partitioning infrastructure from the Linux
1858 kernel. Needed for UBI support.
1859
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001860Legacy uImage format:
1861
wdenkc6097192002-11-03 00:24:07 +00001862 Arg Where When
1863 1 common/cmd_bootm.c before attempting to boot an image
wdenkba56f622004-02-06 23:19:44 +00001864 -1 common/cmd_bootm.c Image header has bad magic number
wdenkc6097192002-11-03 00:24:07 +00001865 2 common/cmd_bootm.c Image header has correct magic number
wdenkba56f622004-02-06 23:19:44 +00001866 -2 common/cmd_bootm.c Image header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001867 3 common/cmd_bootm.c Image header has correct checksum
wdenkba56f622004-02-06 23:19:44 +00001868 -3 common/cmd_bootm.c Image data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001869 4 common/cmd_bootm.c Image data has correct checksum
1870 -4 common/cmd_bootm.c Image is for unsupported architecture
1871 5 common/cmd_bootm.c Architecture check OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001872 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
wdenkc6097192002-11-03 00:24:07 +00001873 6 common/cmd_bootm.c Image Type check OK
1874 -6 common/cmd_bootm.c gunzip uncompression error
1875 -7 common/cmd_bootm.c Unimplemented compression type
1876 7 common/cmd_bootm.c Uncompression OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001877 8 common/cmd_bootm.c No uncompress/copy overwrite error
wdenkc6097192002-11-03 00:24:07 +00001878 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001879
1880 9 common/image.c Start initial ramdisk verification
1881 -10 common/image.c Ramdisk header has bad magic number
1882 -11 common/image.c Ramdisk header has bad checksum
1883 10 common/image.c Ramdisk header is OK
1884 -12 common/image.c Ramdisk data has bad checksum
1885 11 common/image.c Ramdisk data has correct checksum
1886 12 common/image.c Ramdisk verification complete, start loading
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001887 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001888 13 common/image.c Start multifile image verification
1889 14 common/image.c No initial ramdisk, no multifile, continue.
1890
1891 15 lib_<arch>/bootm.c All preparation done, transferring control to OS
wdenkc6097192002-11-03 00:24:07 +00001892
wdenk11dadd52004-02-27 00:07:27 +00001893 -30 lib_ppc/board.c Fatal error, hang the system
1894 -31 post/post.c POST test failed, detected by post_output_backlog()
1895 -32 post/post.c POST test failed, detected by post_run_single()
wdenk63e73c92004-02-23 22:22:28 +00001896
Heiko Schocher566a4942007-06-22 19:11:54 +02001897 34 common/cmd_doc.c before loading a Image from a DOC device
1898 -35 common/cmd_doc.c Bad usage of "doc" command
1899 35 common/cmd_doc.c correct usage of "doc" command
1900 -36 common/cmd_doc.c No boot device
1901 36 common/cmd_doc.c correct boot device
1902 -37 common/cmd_doc.c Unknown Chip ID on boot device
1903 37 common/cmd_doc.c correct chip ID found, device available
1904 -38 common/cmd_doc.c Read Error on boot device
1905 38 common/cmd_doc.c reading Image header from DOC device OK
1906 -39 common/cmd_doc.c Image header has bad magic number
1907 39 common/cmd_doc.c Image header has correct magic number
1908 -40 common/cmd_doc.c Error reading Image from DOC device
1909 40 common/cmd_doc.c Image header has correct magic number
1910 41 common/cmd_ide.c before loading a Image from a IDE device
1911 -42 common/cmd_ide.c Bad usage of "ide" command
1912 42 common/cmd_ide.c correct usage of "ide" command
1913 -43 common/cmd_ide.c No boot device
1914 43 common/cmd_ide.c boot device found
1915 -44 common/cmd_ide.c Device not available
1916 44 common/cmd_ide.c Device available
1917 -45 common/cmd_ide.c wrong partition selected
1918 45 common/cmd_ide.c partition selected
1919 -46 common/cmd_ide.c Unknown partition table
1920 46 common/cmd_ide.c valid partition table found
1921 -47 common/cmd_ide.c Invalid partition type
1922 47 common/cmd_ide.c correct partition type
1923 -48 common/cmd_ide.c Error reading Image Header on boot device
1924 48 common/cmd_ide.c reading Image Header from IDE device OK
1925 -49 common/cmd_ide.c Image header has bad magic number
1926 49 common/cmd_ide.c Image header has correct magic number
1927 -50 common/cmd_ide.c Image header has bad checksum
1928 50 common/cmd_ide.c Image header has correct checksum
1929 -51 common/cmd_ide.c Error reading Image from IDE device
1930 51 common/cmd_ide.c reading Image from IDE device OK
1931 52 common/cmd_nand.c before loading a Image from a NAND device
1932 -53 common/cmd_nand.c Bad usage of "nand" command
1933 53 common/cmd_nand.c correct usage of "nand" command
1934 -54 common/cmd_nand.c No boot device
1935 54 common/cmd_nand.c boot device found
1936 -55 common/cmd_nand.c Unknown Chip ID on boot device
1937 55 common/cmd_nand.c correct chip ID found, device available
1938 -56 common/cmd_nand.c Error reading Image Header on boot device
1939 56 common/cmd_nand.c reading Image Header from NAND device OK
1940 -57 common/cmd_nand.c Image header has bad magic number
1941 57 common/cmd_nand.c Image header has correct magic number
1942 -58 common/cmd_nand.c Error reading Image from NAND device
1943 58 common/cmd_nand.c reading Image from NAND device OK
wdenkc6097192002-11-03 00:24:07 +00001944
Heiko Schocher566a4942007-06-22 19:11:54 +02001945 -60 common/env_common.c Environment has a bad CRC, using default
wdenkc6097192002-11-03 00:24:07 +00001946
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001947 64 net/eth.c starting with Ethernet configuration.
Heiko Schocher566a4942007-06-22 19:11:54 +02001948 -64 net/eth.c no Ethernet found.
1949 65 net/eth.c Ethernet found.
wdenk206c60c2003-09-18 10:02:25 +00001950
Heiko Schocher566a4942007-06-22 19:11:54 +02001951 -80 common/cmd_net.c usage wrong
1952 80 common/cmd_net.c before calling NetLoop()
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001953 -81 common/cmd_net.c some error in NetLoop() occurred
Heiko Schocher566a4942007-06-22 19:11:54 +02001954 81 common/cmd_net.c NetLoop() back without error
1955 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
1956 82 common/cmd_net.c trying automatic boot
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02001957 83 common/cmd_net.c running "source" command
1958 -83 common/cmd_net.c some error in automatic boot or "source" command
Heiko Schocher566a4942007-06-22 19:11:54 +02001959 84 common/cmd_net.c end without errors
wdenkc6097192002-11-03 00:24:07 +00001960
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001961FIT uImage format:
1962
1963 Arg Where When
1964 100 common/cmd_bootm.c Kernel FIT Image has correct format
1965 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
1966 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
1967 -101 common/cmd_bootm.c Can't get configuration for kernel subimage
1968 102 common/cmd_bootm.c Kernel unit name specified
1969 -103 common/cmd_bootm.c Can't get kernel subimage node offset
Marian Balakowiczf773bea2008-03-12 10:35:46 +01001970 103 common/cmd_bootm.c Found configuration node
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001971 104 common/cmd_bootm.c Got kernel subimage node offset
1972 -104 common/cmd_bootm.c Kernel subimage hash verification failed
1973 105 common/cmd_bootm.c Kernel subimage hash verification OK
1974 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
1975 106 common/cmd_bootm.c Architecture check OK
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001976 -106 common/cmd_bootm.c Kernel subimage has wrong type
1977 107 common/cmd_bootm.c Kernel subimage type OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001978 -107 common/cmd_bootm.c Can't get kernel subimage data/size
1979 108 common/cmd_bootm.c Got kernel subimage data/size
1980 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
1981 -109 common/cmd_bootm.c Can't get kernel subimage type
1982 -110 common/cmd_bootm.c Can't get kernel subimage comp
1983 -111 common/cmd_bootm.c Can't get kernel subimage os
1984 -112 common/cmd_bootm.c Can't get kernel subimage load address
1985 -113 common/cmd_bootm.c Image uncompress/copy overwrite error
1986
1987 120 common/image.c Start initial ramdisk verification
1988 -120 common/image.c Ramdisk FIT image has incorrect format
1989 121 common/image.c Ramdisk FIT image has correct format
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001990 122 common/image.c No ramdisk subimage unit name, using configuration
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001991 -122 common/image.c Can't get configuration for ramdisk subimage
1992 123 common/image.c Ramdisk unit name specified
1993 -124 common/image.c Can't get ramdisk subimage node offset
1994 125 common/image.c Got ramdisk subimage node offset
1995 -125 common/image.c Ramdisk subimage hash verification failed
1996 126 common/image.c Ramdisk subimage hash verification OK
1997 -126 common/image.c Ramdisk subimage for unsupported architecture
1998 127 common/image.c Architecture check OK
1999 -127 common/image.c Can't get ramdisk subimage data/size
2000 128 common/image.c Got ramdisk subimage data/size
2001 129 common/image.c Can't get ramdisk load address
2002 -129 common/image.c Got ramdisk load address
2003
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002004 -130 common/cmd_doc.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002005 131 common/cmd_doc.c FIT image format OK
2006
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002007 -140 common/cmd_ide.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002008 141 common/cmd_ide.c FIT image format OK
2009
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002010 -150 common/cmd_nand.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002011 151 common/cmd_nand.c FIT image format OK
2012
2013
wdenkc6097192002-11-03 00:24:07 +00002014Modem Support:
2015--------------
2016
wdenk85ec0bc2003-03-31 16:34:49 +00002017[so far only for SMDK2400 and TRAB boards]
wdenkc6097192002-11-03 00:24:07 +00002018
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002019- Modem support enable:
wdenkc6097192002-11-03 00:24:07 +00002020 CONFIG_MODEM_SUPPORT
2021
2022- RTS/CTS Flow control enable:
2023 CONFIG_HWFLOW
2024
2025- Modem debug support:
2026 CONFIG_MODEM_SUPPORT_DEBUG
2027
wdenk43d96162003-03-06 00:02:04 +00002028 Enables debugging stuff (char screen[1024], dbg())
2029 for modem support. Useful only with BDI2000.
wdenkc6097192002-11-03 00:24:07 +00002030
wdenka8c7c702003-12-06 19:49:23 +00002031- Interrupt support (PPC):
2032
wdenkd4ca31c2004-01-02 14:00:00 +00002033 There are common interrupt_init() and timer_interrupt()
2034 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002035 for CPU specific initialization. interrupt_init_cpu()
wdenkd4ca31c2004-01-02 14:00:00 +00002036 should set decrementer_count to appropriate value. If
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002037 CPU resets decrementer automatically after interrupt
wdenkd4ca31c2004-01-02 14:00:00 +00002038 (ppc4xx) it should set decrementer_count to zero.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002039 timer_interrupt() calls timer_interrupt_cpu() for CPU
wdenkd4ca31c2004-01-02 14:00:00 +00002040 specific handling. If board has watchdog / status_led
2041 / other_activity_monitor it works automatically from
2042 general timer_interrupt().
wdenka8c7c702003-12-06 19:49:23 +00002043
wdenkc6097192002-11-03 00:24:07 +00002044- General:
2045
wdenk43d96162003-03-06 00:02:04 +00002046 In the target system modem support is enabled when a
2047 specific key (key combination) is pressed during
2048 power-on. Otherwise U-Boot will boot normally
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002049 (autoboot). The key_pressed() function is called from
wdenk43d96162003-03-06 00:02:04 +00002050 board_init(). Currently key_pressed() is a dummy
2051 function, returning 1 and thus enabling modem
2052 initialization.
wdenkc6097192002-11-03 00:24:07 +00002053
wdenk43d96162003-03-06 00:02:04 +00002054 If there are no modem init strings in the
2055 environment, U-Boot proceed to autoboot; the
2056 previous output (banner, info printfs) will be
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002057 suppressed, though.
wdenkc6097192002-11-03 00:24:07 +00002058
2059 See also: doc/README.Modem
2060
2061
wdenkc6097192002-11-03 00:24:07 +00002062Configuration Settings:
2063-----------------------
2064
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002065- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
wdenkc6097192002-11-03 00:24:07 +00002066 undefine this when you're short of memory.
2067
Peter Tyser2fb26042009-01-27 18:03:12 -06002068- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
2069 width of the commands listed in the 'help' command output.
2070
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002071- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
wdenkc6097192002-11-03 00:24:07 +00002072 prompt for user input.
2073
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002074- CONFIG_SYS_CBSIZE: Buffer size for input from the Console
wdenkc6097192002-11-03 00:24:07 +00002075
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002076- CONFIG_SYS_PBSIZE: Buffer size for Console output
wdenkc6097192002-11-03 00:24:07 +00002077
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002078- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
wdenkc6097192002-11-03 00:24:07 +00002079
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002080- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
wdenkc6097192002-11-03 00:24:07 +00002081 the application (usually a Linux kernel) when it is
2082 booted
2083
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002084- CONFIG_SYS_BAUDRATE_TABLE:
wdenkc6097192002-11-03 00:24:07 +00002085 List of legal baudrate settings for this board.
2086
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002087- CONFIG_SYS_CONSOLE_INFO_QUIET
wdenk8bde7f72003-06-27 21:31:46 +00002088 Suppress display of console information at boot.
wdenkc6097192002-11-03 00:24:07 +00002089
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002090- CONFIG_SYS_CONSOLE_IS_IN_ENV
wdenk8bde7f72003-06-27 21:31:46 +00002091 If the board specific function
2092 extern int overwrite_console (void);
2093 returns 1, the stdin, stderr and stdout are switched to the
wdenkc6097192002-11-03 00:24:07 +00002094 serial port, else the settings in the environment are used.
2095
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002096- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
wdenk8bde7f72003-06-27 21:31:46 +00002097 Enable the call to overwrite_console().
wdenkc6097192002-11-03 00:24:07 +00002098
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002099- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
wdenkc6097192002-11-03 00:24:07 +00002100 Enable overwrite of previous console environment settings.
2101
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002102- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
wdenkc6097192002-11-03 00:24:07 +00002103 Begin and End addresses of the area used by the
2104 simple memory test.
2105
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002106- CONFIG_SYS_ALT_MEMTEST:
wdenk8bde7f72003-06-27 21:31:46 +00002107 Enable an alternate, more extensive memory test.
wdenkc6097192002-11-03 00:24:07 +00002108
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002109- CONFIG_SYS_MEMTEST_SCRATCH:
wdenk5f535fe2003-09-18 09:21:33 +00002110 Scratch address used by the alternate memory test
2111 You only need to set this if address zero isn't writeable
2112
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002113- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
2114 If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
Stefan Roese14f73ca2008-03-26 10:14:11 +01002115 this specified memory area will get subtracted from the top
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002116 (end) of RAM and won't get "touched" at all by U-Boot. By
Stefan Roese14f73ca2008-03-26 10:14:11 +01002117 fixing up gd->ram_size the Linux kernel should gets passed
2118 the now "corrected" memory size and won't touch it either.
2119 This should work for arch/ppc and arch/powerpc. Only Linux
Stefan Roese5e12e752008-03-28 11:02:53 +01002120 board ports in arch/powerpc with bootwrapper support that
Stefan Roese14f73ca2008-03-26 10:14:11 +01002121 recalculate the memory size from the SDRAM controller setup
Stefan Roese5e12e752008-03-28 11:02:53 +01002122 will have to get fixed in Linux additionally.
Stefan Roese14f73ca2008-03-26 10:14:11 +01002123
2124 This option can be used as a workaround for the 440EPx/GRx
2125 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
2126 be touched.
2127
2128 WARNING: Please make sure that this value is a multiple of
2129 the Linux page size (normally 4k). If this is not the case,
2130 then the end address of the Linux memory will be located at a
2131 non page size aligned address and this could cause major
2132 problems.
2133
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002134- CONFIG_SYS_TFTP_LOADADDR:
wdenkc6097192002-11-03 00:24:07 +00002135 Default load address for network file downloads
2136
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002137- CONFIG_SYS_LOADS_BAUD_CHANGE:
wdenkc6097192002-11-03 00:24:07 +00002138 Enable temporary baudrate change while serial download
2139
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002140- CONFIG_SYS_SDRAM_BASE:
wdenkc6097192002-11-03 00:24:07 +00002141 Physical start address of SDRAM. _Must_ be 0 here.
2142
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002143- CONFIG_SYS_MBIO_BASE:
wdenkc6097192002-11-03 00:24:07 +00002144 Physical start address of Motherboard I/O (if using a
2145 Cogent motherboard)
2146
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002147- CONFIG_SYS_FLASH_BASE:
wdenkc6097192002-11-03 00:24:07 +00002148 Physical start address of Flash memory.
2149
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002150- CONFIG_SYS_MONITOR_BASE:
wdenkc6097192002-11-03 00:24:07 +00002151 Physical start address of boot monitor code (set by
2152 make config files to be same as the text base address
2153 (TEXT_BASE) used when linking) - same as
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002154 CONFIG_SYS_FLASH_BASE when booting from flash.
wdenkc6097192002-11-03 00:24:07 +00002155
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002156- CONFIG_SYS_MONITOR_LEN:
wdenk8bde7f72003-06-27 21:31:46 +00002157 Size of memory reserved for monitor code, used to
2158 determine _at_compile_time_ (!) if the environment is
2159 embedded within the U-Boot image, or in a separate
2160 flash sector.
wdenkc6097192002-11-03 00:24:07 +00002161
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002162- CONFIG_SYS_MALLOC_LEN:
wdenkc6097192002-11-03 00:24:07 +00002163 Size of DRAM reserved for malloc() use.
2164
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002165- CONFIG_SYS_BOOTM_LEN:
Stefan Roese15940c92006-03-13 11:16:36 +01002166 Normally compressed uImages are limited to an
2167 uncompressed size of 8 MBytes. If this is not enough,
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002168 you can define CONFIG_SYS_BOOTM_LEN in your board config file
Stefan Roese15940c92006-03-13 11:16:36 +01002169 to adjust this setting to your needs.
2170
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002171- CONFIG_SYS_BOOTMAPSZ:
wdenkc6097192002-11-03 00:24:07 +00002172 Maximum size of memory mapped by the startup code of
2173 the Linux kernel; all data that must be processed by
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02002174 the Linux kernel (bd_info, boot arguments, FDT blob if
2175 used) must be put below this limit, unless "bootm_low"
2176 enviroment variable is defined and non-zero. In such case
2177 all data for the Linux kernel must be between "bootm_low"
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002178 and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.
wdenkc6097192002-11-03 00:24:07 +00002179
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002180- CONFIG_SYS_MAX_FLASH_BANKS:
wdenkc6097192002-11-03 00:24:07 +00002181 Max number of Flash memory banks
2182
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002183- CONFIG_SYS_MAX_FLASH_SECT:
wdenkc6097192002-11-03 00:24:07 +00002184 Max number of sectors on a Flash chip
2185
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002186- CONFIG_SYS_FLASH_ERASE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00002187 Timeout for Flash erase operations (in ms)
2188
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002189- CONFIG_SYS_FLASH_WRITE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00002190 Timeout for Flash write operations (in ms)
2191
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002192- CONFIG_SYS_FLASH_LOCK_TOUT
wdenk8564acf2003-07-14 22:13:32 +00002193 Timeout for Flash set sector lock bit operation (in ms)
2194
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002195- CONFIG_SYS_FLASH_UNLOCK_TOUT
wdenk8564acf2003-07-14 22:13:32 +00002196 Timeout for Flash clear lock bits operation (in ms)
2197
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002198- CONFIG_SYS_FLASH_PROTECTION
wdenk8564acf2003-07-14 22:13:32 +00002199 If defined, hardware flash sectors protection is used
2200 instead of U-Boot software protection.
2201
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002202- CONFIG_SYS_DIRECT_FLASH_TFTP:
wdenkc6097192002-11-03 00:24:07 +00002203
2204 Enable TFTP transfers directly to flash memory;
2205 without this option such a download has to be
2206 performed in two steps: (1) download to RAM, and (2)
2207 copy from RAM to flash.
2208
2209 The two-step approach is usually more reliable, since
2210 you can check if the download worked before you erase
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002211 the flash, but in some situations (when system RAM is
2212 too limited to allow for a temporary copy of the
wdenkc6097192002-11-03 00:24:07 +00002213 downloaded image) this option may be very useful.
2214
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002215- CONFIG_SYS_FLASH_CFI:
wdenk43d96162003-03-06 00:02:04 +00002216 Define if the flash driver uses extra elements in the
wdenk5653fc32004-02-08 22:55:38 +00002217 common flash structure for storing flash geometry.
2218
Jean-Christophe PLAGNIOL-VILLARD00b18832008-08-13 01:40:42 +02002219- CONFIG_FLASH_CFI_DRIVER
wdenk5653fc32004-02-08 22:55:38 +00002220 This option also enables the building of the cfi_flash driver
2221 in the drivers directory
wdenkc6097192002-11-03 00:24:07 +00002222
Piotr Ziecik91809ed2008-11-17 15:57:58 +01002223- CONFIG_FLASH_CFI_MTD
2224 This option enables the building of the cfi_mtd driver
2225 in the drivers directory. The driver exports CFI flash
2226 to the MTD layer.
2227
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002228- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
Guennadi Liakhovetski96ef8312008-04-03 13:36:02 +02002229 Use buffered writes to flash.
2230
2231- CONFIG_FLASH_SPANSION_S29WS_N
2232 s29ws-n MirrorBit flash has non-standard addresses for buffered
2233 write commands.
2234
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002235- CONFIG_SYS_FLASH_QUIET_TEST
Stefan Roese5568e612005-11-22 13:20:42 +01002236 If this option is defined, the common CFI flash doesn't
2237 print it's warning upon not recognized FLASH banks. This
2238 is useful, if some of the configured banks are only
2239 optionally available.
2240
Jerry Van Baren9a042e92008-03-08 13:48:01 -05002241- CONFIG_FLASH_SHOW_PROGRESS
2242 If defined (must be an integer), print out countdown
2243 digits and dots. Recommended value: 45 (9..1) for 80
2244 column displays, 15 (3..1) for 40 column displays.
2245
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002246- CONFIG_SYS_RX_ETH_BUFFER:
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002247 Defines the number of Ethernet receive buffers. On some
2248 Ethernet controllers it is recommended to set this value
stroese53cf9432003-06-05 15:39:44 +00002249 to 8 or even higher (EEPRO100 or 405 EMAC), since all
2250 buffers can be full shortly after enabling the interface
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002251 on high Ethernet traffic.
stroese53cf9432003-06-05 15:39:44 +00002252 Defaults to 4 if not defined.
2253
wdenkc6097192002-11-03 00:24:07 +00002254The following definitions that deal with the placement and management
2255of environment data (variable area); in general, we support the
2256following configurations:
2257
Jean-Christophe PLAGNIOL-VILLARD5a1aceb2008-09-10 22:48:04 +02002258- CONFIG_ENV_IS_IN_FLASH:
wdenkc6097192002-11-03 00:24:07 +00002259
2260 Define this if the environment is in flash memory.
2261
2262 a) The environment occupies one whole flash sector, which is
2263 "embedded" in the text segment with the U-Boot code. This
2264 happens usually with "bottom boot sector" or "top boot
2265 sector" type flash chips, which have several smaller
2266 sectors at the start or the end. For instance, such a
2267 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2268 such a case you would place the environment in one of the
2269 4 kB sectors - with U-Boot code before and after it. With
2270 "top boot sector" type flash chips, you would put the
2271 environment in one of the last sectors, leaving a gap
2272 between U-Boot and the environment.
2273
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002274 - CONFIG_ENV_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00002275
2276 Offset of environment data (variable area) to the
2277 beginning of flash memory; for instance, with bottom boot
2278 type flash chips the second sector can be used: the offset
2279 for this sector is given here.
2280
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002281 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
wdenkc6097192002-11-03 00:24:07 +00002282
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002283 - CONFIG_ENV_ADDR:
wdenkc6097192002-11-03 00:24:07 +00002284
2285 This is just another way to specify the start address of
2286 the flash sector containing the environment (instead of
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002287 CONFIG_ENV_OFFSET).
wdenkc6097192002-11-03 00:24:07 +00002288
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002289 - CONFIG_ENV_SECT_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002290
2291 Size of the sector containing the environment.
2292
2293
2294 b) Sometimes flash chips have few, equal sized, BIG sectors.
2295 In such a case you don't want to spend a whole sector for
2296 the environment.
2297
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002298 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002299
Jean-Christophe PLAGNIOL-VILLARD5a1aceb2008-09-10 22:48:04 +02002300 If you use this in combination with CONFIG_ENV_IS_IN_FLASH
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002301 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
wdenkc6097192002-11-03 00:24:07 +00002302 of this flash sector for the environment. This saves
2303 memory for the RAM copy of the environment.
2304
2305 It may also save flash memory if you decide to use this
2306 when your environment is "embedded" within U-Boot code,
2307 since then the remainder of the flash sector could be used
2308 for U-Boot code. It should be pointed out that this is
2309 STRONGLY DISCOURAGED from a robustness point of view:
2310 updating the environment in flash makes it always
2311 necessary to erase the WHOLE sector. If something goes
2312 wrong before the contents has been restored from a copy in
2313 RAM, your target system will be dead.
2314
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002315 - CONFIG_ENV_ADDR_REDUND
2316 CONFIG_ENV_SIZE_REDUND
wdenkc6097192002-11-03 00:24:07 +00002317
wdenk43d96162003-03-06 00:02:04 +00002318 These settings describe a second storage area used to hold
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002319 a redundant copy of the environment data, so that there is
wdenk3e386912003-04-05 00:53:31 +00002320 a valid backup copy in case there is a power failure during
wdenk43d96162003-03-06 00:02:04 +00002321 a "saveenv" operation.
wdenkc6097192002-11-03 00:24:07 +00002322
2323BE CAREFUL! Any changes to the flash layout, and some changes to the
2324source code will make it necessary to adapt <board>/u-boot.lds*
2325accordingly!
2326
2327
Jean-Christophe PLAGNIOL-VILLARD9314cee2008-09-10 22:47:59 +02002328- CONFIG_ENV_IS_IN_NVRAM:
wdenkc6097192002-11-03 00:24:07 +00002329
2330 Define this if you have some non-volatile memory device
2331 (NVRAM, battery buffered SRAM) which you want to use for the
2332 environment.
2333
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002334 - CONFIG_ENV_ADDR:
2335 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002336
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002337 These two #defines are used to determine the memory area you
wdenkc6097192002-11-03 00:24:07 +00002338 want to use for environment. It is assumed that this memory
2339 can just be read and written to, without any special
2340 provision.
2341
2342BE CAREFUL! The first access to the environment happens quite early
2343in U-Boot initalization (when we try to get the setting of for the
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002344console baudrate). You *MUST* have mapped your NVRAM area then, or
wdenkc6097192002-11-03 00:24:07 +00002345U-Boot will hang.
2346
2347Please note that even with NVRAM we still use a copy of the
2348environment in RAM: we could work on NVRAM directly, but we want to
2349keep settings there always unmodified except somebody uses "saveenv"
2350to save the current settings.
2351
2352
Jean-Christophe PLAGNIOL-VILLARDbb1f8b42008-09-05 09:19:30 +02002353- CONFIG_ENV_IS_IN_EEPROM:
wdenkc6097192002-11-03 00:24:07 +00002354
2355 Use this if you have an EEPROM or similar serial access
2356 device and a driver for it.
2357
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002358 - CONFIG_ENV_OFFSET:
2359 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002360
2361 These two #defines specify the offset and size of the
2362 environment area within the total memory of your EEPROM.
2363
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002364 - CONFIG_SYS_I2C_EEPROM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00002365 If defined, specified the chip address of the EEPROM device.
2366 The default address is zero.
2367
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002368 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
wdenkc6097192002-11-03 00:24:07 +00002369 If defined, the number of bits used to address bytes in a
2370 single page in the EEPROM device. A 64 byte page, for example
2371 would require six bits.
2372
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002373 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
wdenkc6097192002-11-03 00:24:07 +00002374 If defined, the number of milliseconds to delay between
wdenkba56f622004-02-06 23:19:44 +00002375 page writes. The default is zero milliseconds.
wdenkc6097192002-11-03 00:24:07 +00002376
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002377 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
wdenkc6097192002-11-03 00:24:07 +00002378 The length in bytes of the EEPROM memory array address. Note
2379 that this is NOT the chip address length!
2380
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002381 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
wdenk5cf91d62004-04-23 20:32:05 +00002382 EEPROM chips that implement "address overflow" are ones
2383 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
2384 address and the extra bits end up in the "chip address" bit
2385 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
2386 byte chips.
2387
2388 Note that we consider the length of the address field to
2389 still be one byte because the extra address bits are hidden
2390 in the chip address.
2391
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002392 - CONFIG_SYS_EEPROM_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002393 The size in bytes of the EEPROM device.
2394
wdenkc6097192002-11-03 00:24:07 +00002395
Jean-Christophe PLAGNIOL-VILLARD057c8492008-09-10 22:47:58 +02002396- CONFIG_ENV_IS_IN_DATAFLASH:
wdenk5779d8d2003-12-06 23:55:10 +00002397
wdenkd4ca31c2004-01-02 14:00:00 +00002398 Define this if you have a DataFlash memory device which you
wdenk5779d8d2003-12-06 23:55:10 +00002399 want to use for the environment.
2400
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002401 - CONFIG_ENV_OFFSET:
2402 - CONFIG_ENV_ADDR:
2403 - CONFIG_ENV_SIZE:
wdenk5779d8d2003-12-06 23:55:10 +00002404
2405 These three #defines specify the offset and size of the
2406 environment area within the total memory of your DataFlash placed
2407 at the specified address.
2408
Jean-Christophe PLAGNIOL-VILLARD51bfee12008-09-10 22:47:58 +02002409- CONFIG_ENV_IS_IN_NAND:
wdenk13a56952004-06-09 14:58:14 +00002410
2411 Define this if you have a NAND device which you want to use
2412 for the environment.
2413
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002414 - CONFIG_ENV_OFFSET:
2415 - CONFIG_ENV_SIZE:
wdenk13a56952004-06-09 14:58:14 +00002416
2417 These two #defines specify the offset and size of the environment
2418 area within the first NAND device.
wdenk5779d8d2003-12-06 23:55:10 +00002419
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002420 - CONFIG_ENV_OFFSET_REDUND
Markus Klotzbuechere443c942006-03-20 18:02:44 +01002421
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002422 This setting describes a second storage area of CONFIG_ENV_SIZE
Markus Klotzbuechere443c942006-03-20 18:02:44 +01002423 size used to hold a redundant copy of the environment data,
2424 so that there is a valid backup copy in case there is a
2425 power failure during a "saveenv" operation.
2426
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002427 Note: CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND must be aligned
2428 to a block boundary, and CONFIG_ENV_SIZE must be a multiple of
Markus Klotzbuechere443c942006-03-20 18:02:44 +01002429 the NAND devices block size.
2430
Guennadi Liakhovetskib74ab732009-05-18 16:07:22 +02002431- CONFIG_NAND_ENV_DST
2432
2433 Defines address in RAM to which the nand_spl code should copy the
2434 environment. If redundant environment is used, it will be copied to
2435 CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
2436
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002437- CONFIG_SYS_SPI_INIT_OFFSET
wdenkc6097192002-11-03 00:24:07 +00002438
2439 Defines offset to the initial SPI buffer area in DPRAM. The
2440 area is used at an early stage (ROM part) if the environment
2441 is configured to reside in the SPI EEPROM: We need a 520 byte
2442 scratch DPRAM area. It is used between the two initialization
2443 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2444 to be a good choice since it makes it far enough from the
2445 start of the data area as well as from the stack pointer.
2446
Bruce Adlere881cb52007-11-02 13:15:42 -07002447Please note that the environment is read-only until the monitor
wdenkc6097192002-11-03 00:24:07 +00002448has been relocated to RAM and a RAM copy of the environment has been
2449created; also, when using EEPROM you will have to use getenv_r()
2450until then to read environment variables.
2451
wdenk85ec0bc2003-03-31 16:34:49 +00002452The environment is protected by a CRC32 checksum. Before the monitor
2453is relocated into RAM, as a result of a bad CRC you will be working
2454with the compiled-in default environment - *silently*!!! [This is
2455necessary, because the first environment variable we need is the
2456"baudrate" setting for the console - if we have a bad CRC, we don't
2457have any device yet where we could complain.]
wdenkc6097192002-11-03 00:24:07 +00002458
2459Note: once the monitor has been relocated, then it will complain if
2460the default environment is used; a new CRC is computed as soon as you
wdenk85ec0bc2003-03-31 16:34:49 +00002461use the "saveenv" command to store a valid environment.
wdenkc6097192002-11-03 00:24:07 +00002462
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002463- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
wdenk42d1f032003-10-15 23:53:47 +00002464 Echo the inverted Ethernet link state to the fault LED.
wdenkfc3e2162003-10-08 22:33:00 +00002465
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002466 Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
wdenkfc3e2162003-10-08 22:33:00 +00002467 also needs to be defined.
2468
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002469- CONFIG_SYS_FAULT_MII_ADDR:
wdenk42d1f032003-10-15 23:53:47 +00002470 MII address of the PHY to check for the Ethernet link state.
wdenkc6097192002-11-03 00:24:07 +00002471
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002472- CONFIG_SYS_64BIT_VSPRINTF:
wdenkc40b2952004-03-13 23:29:43 +00002473 Makes vsprintf (and all *printf functions) support printing
2474 of 64bit values by using the L quantifier
2475
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002476- CONFIG_SYS_64BIT_STRTOUL:
wdenkc40b2952004-03-13 23:29:43 +00002477 Adds simple_strtoull that returns a 64bit value
2478
Ron Madridf5675aa2009-02-18 14:30:44 -08002479- CONFIG_NS16550_MIN_FUNCTIONS:
2480 Define this if you desire to only have use of the NS16550_init
2481 and NS16550_putc functions for the serial driver located at
2482 drivers/serial/ns16550.c. This option is useful for saving
2483 space for already greatly restricted images, including but not
2484 limited to NAND_SPL configurations.
2485
wdenkc6097192002-11-03 00:24:07 +00002486Low Level (hardware related) configuration options:
wdenkdc7c9a12003-03-26 06:55:25 +00002487---------------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00002488
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002489- CONFIG_SYS_CACHELINE_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002490 Cache Line Size of the CPU.
2491
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002492- CONFIG_SYS_DEFAULT_IMMR:
wdenkc6097192002-11-03 00:24:07 +00002493 Default address of the IMMR after system reset.
wdenk2535d602003-07-17 23:16:40 +00002494
wdenk42d1f032003-10-15 23:53:47 +00002495 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
2496 and RPXsuper) to be able to adjust the position of
2497 the IMMR register after a reset.
wdenkc6097192002-11-03 00:24:07 +00002498
wdenk7f6c2cb2002-11-10 22:06:23 +00002499- Floppy Disk Support:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002500 CONFIG_SYS_FDC_DRIVE_NUMBER
wdenk7f6c2cb2002-11-10 22:06:23 +00002501
2502 the default drive number (default value 0)
2503
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002504 CONFIG_SYS_ISA_IO_STRIDE
wdenk7f6c2cb2002-11-10 22:06:23 +00002505
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002506 defines the spacing between FDC chipset registers
wdenk7f6c2cb2002-11-10 22:06:23 +00002507 (default value 1)
2508
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002509 CONFIG_SYS_ISA_IO_OFFSET
wdenk7f6c2cb2002-11-10 22:06:23 +00002510
wdenk43d96162003-03-06 00:02:04 +00002511 defines the offset of register from address. It
2512 depends on which part of the data bus is connected to
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002513 the FDC chipset. (default value 0)
wdenk7f6c2cb2002-11-10 22:06:23 +00002514
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002515 If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
2516 CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
wdenk43d96162003-03-06 00:02:04 +00002517 default value.
wdenk7f6c2cb2002-11-10 22:06:23 +00002518
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002519 if CONFIG_SYS_FDC_HW_INIT is defined, then the function
wdenk43d96162003-03-06 00:02:04 +00002520 fdc_hw_init() is called at the beginning of the FDC
2521 setup. fdc_hw_init() must be provided by the board
2522 source code. It is used to make hardware dependant
2523 initializations.
wdenk7f6c2cb2002-11-10 22:06:23 +00002524
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002525- CONFIG_SYS_IMMR: Physical address of the Internal Memory.
wdenkefe2a4d2004-12-16 21:44:03 +00002526 DO NOT CHANGE unless you know exactly what you're
wdenk25d67122004-12-10 11:40:40 +00002527 doing! (11-4) [MPC8xx/82xx systems only]
wdenkc6097192002-11-03 00:24:07 +00002528
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002529- CONFIG_SYS_INIT_RAM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00002530
wdenk7152b1d2003-09-05 23:19:14 +00002531 Start address of memory area that can be used for
wdenkc6097192002-11-03 00:24:07 +00002532 initial data and stack; please note that this must be
2533 writable memory that is working WITHOUT special
2534 initialization, i. e. you CANNOT use normal RAM which
2535 will become available only after programming the
2536 memory controller and running certain initialization
2537 sequences.
2538
2539 U-Boot uses the following memory types:
2540 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2541 - MPC824X: data cache
2542 - PPC4xx: data cache
2543
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002544- CONFIG_SYS_GBL_DATA_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00002545
2546 Offset of the initial data structure in the memory
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002547 area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
2548 CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
wdenkc6097192002-11-03 00:24:07 +00002549 data is located at the end of the available space
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002550 (sometimes written as (CONFIG_SYS_INIT_RAM_END -
2551 CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
2552 below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
2553 CONFIG_SYS_GBL_DATA_OFFSET) downward.
wdenkc6097192002-11-03 00:24:07 +00002554
2555 Note:
2556 On the MPC824X (or other systems that use the data
2557 cache for initial memory) the address chosen for
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002558 CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
wdenkc6097192002-11-03 00:24:07 +00002559 point to an otherwise UNUSED address space between
2560 the top of RAM and the start of the PCI space.
2561
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002562- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
wdenkc6097192002-11-03 00:24:07 +00002563
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002564- CONFIG_SYS_SYPCR: System Protection Control (11-9)
wdenkc6097192002-11-03 00:24:07 +00002565
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002566- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
wdenkc6097192002-11-03 00:24:07 +00002567
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002568- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
wdenkc6097192002-11-03 00:24:07 +00002569
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002570- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
wdenkc6097192002-11-03 00:24:07 +00002571
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002572- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
wdenkc6097192002-11-03 00:24:07 +00002573
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002574- CONFIG_SYS_OR_TIMING_SDRAM:
wdenkc6097192002-11-03 00:24:07 +00002575 SDRAM timing
2576
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002577- CONFIG_SYS_MAMR_PTA:
wdenkc6097192002-11-03 00:24:07 +00002578 periodic timer for refresh
2579
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002580- CONFIG_SYS_DER: Debug Event Register (37-47)
wdenkc6097192002-11-03 00:24:07 +00002581
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002582- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
2583 CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
2584 CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
2585 CONFIG_SYS_BR1_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00002586 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2587
2588- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002589 CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
2590 CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00002591 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2592
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002593- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
2594 CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
wdenkc6097192002-11-03 00:24:07 +00002595 Machine Mode Register and Memory Periodic Timer
2596 Prescaler definitions (SDRAM timing)
2597
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002598- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00002599 enable I2C microcode relocation patch (MPC8xx);
2600 define relocation offset in DPRAM [DSP2]
2601
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002602- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
Heiko Schocherb423d052008-01-11 01:12:07 +01002603 enable SMC microcode relocation patch (MPC8xx);
2604 define relocation offset in DPRAM [SMC1]
2605
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002606- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00002607 enable SPI microcode relocation patch (MPC8xx);
2608 define relocation offset in DPRAM [SCC4]
2609
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002610- CONFIG_SYS_USE_OSCCLK:
wdenkc6097192002-11-03 00:24:07 +00002611 Use OSCM clock mode on MBX8xx board. Be careful,
2612 wrong setting might damage your board. Read
2613 doc/README.MBX before setting this variable!
2614
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002615- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
wdenk43d96162003-03-06 00:02:04 +00002616 Offset of the bootmode word in DPRAM used by post
2617 (Power On Self Tests). This definition overrides
2618 #define'd default value in commproc.h resp.
2619 cpm_8260.h.
wdenkea909b72002-11-21 23:11:29 +00002620
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002621- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
2622 CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
2623 CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
2624 CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
2625 CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
2626 CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
2627 CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
2628 CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
wdenk5d232d02003-05-22 22:52:13 +00002629 Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
2630
Dirk Eibach9cacf4f2009-02-09 08:18:34 +01002631- CONFIG_PCI_DISABLE_PCIE:
2632 Disable PCI-Express on systems where it is supported but not
2633 required.
2634
Ben Warrenbb99ad62006-09-07 16:50:54 -04002635- CONFIG_SPD_EEPROM
Wolfgang Denk218ca722008-03-26 10:40:12 +01002636 Get DDR timing information from an I2C EEPROM. Common
2637 with pluggable memory modules such as SODIMMs
2638
Ben Warrenbb99ad62006-09-07 16:50:54 -04002639 SPD_EEPROM_ADDRESS
2640 I2C address of the SPD EEPROM
2641
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002642- CONFIG_SYS_SPD_BUS_NUM
Wolfgang Denk218ca722008-03-26 10:40:12 +01002643 If SPD EEPROM is on an I2C bus other than the first
2644 one, specify here. Note that the value must resolve
2645 to something your driver can deal with.
Ben Warrenbb99ad62006-09-07 16:50:54 -04002646
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002647- CONFIG_SYS_83XX_DDR_USES_CS0
Wolfgang Denk218ca722008-03-26 10:40:12 +01002648 Only for 83xx systems. If specified, then DDR should
2649 be configured using CS0 and CS1 instead of CS2 and CS3.
Timur Tabi2ad6b512006-10-31 18:44:42 -06002650
wdenkc26e4542004-04-18 10:13:26 +00002651- CONFIG_ETHER_ON_FEC[12]
2652 Define to enable FEC[12] on a 8xx series processor.
2653
2654- CONFIG_FEC[12]_PHY
2655 Define to the hardcoded PHY address which corresponds
wdenk6e592382004-04-18 17:39:38 +00002656 to the given FEC; i. e.
2657 #define CONFIG_FEC1_PHY 4
wdenkc26e4542004-04-18 10:13:26 +00002658 means that the PHY with address 4 is connected to FEC1
2659
2660 When set to -1, means to probe for first available.
2661
2662- CONFIG_FEC[12]_PHY_NORXERR
2663 The PHY does not have a RXERR line (RMII only).
2664 (so program the FEC to ignore it).
2665
2666- CONFIG_RMII
2667 Enable RMII mode for all FECs.
2668 Note that this is a global option, we can't
2669 have one FEC in standard MII mode and another in RMII mode.
2670
wdenk5cf91d62004-04-23 20:32:05 +00002671- CONFIG_CRC32_VERIFY
2672 Add a verify option to the crc32 command.
2673 The syntax is:
2674
2675 => crc32 -v <address> <count> <crc32>
2676
2677 Where address/count indicate a memory area
2678 and crc32 is the correct crc32 which the
2679 area should have.
2680
wdenk56523f12004-07-11 17:40:54 +00002681- CONFIG_LOOPW
2682 Add the "loopw" memory command. This only takes effect if
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002683 the memory commands are activated globally (CONFIG_CMD_MEM).
wdenk56523f12004-07-11 17:40:54 +00002684
stroese7b466642004-12-16 18:46:55 +00002685- CONFIG_MX_CYCLIC
2686 Add the "mdc" and "mwc" memory commands. These are cyclic
2687 "md/mw" commands.
2688 Examples:
2689
wdenkefe2a4d2004-12-16 21:44:03 +00002690 => mdc.b 10 4 500
stroese7b466642004-12-16 18:46:55 +00002691 This command will print 4 bytes (10,11,12,13) each 500 ms.
2692
wdenkefe2a4d2004-12-16 21:44:03 +00002693 => mwc.l 100 12345678 10
stroese7b466642004-12-16 18:46:55 +00002694 This command will write 12345678 to address 100 all 10 ms.
2695
wdenkefe2a4d2004-12-16 21:44:03 +00002696 This only takes effect if the memory commands are activated
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002697 globally (CONFIG_CMD_MEM).
stroese7b466642004-12-16 18:46:55 +00002698
wdenk8aa1a2d2005-04-04 12:44:11 +00002699- CONFIG_SKIP_LOWLEVEL_INIT
2700- CONFIG_SKIP_RELOCATE_UBOOT
2701
wdenk3c2b3d42005-04-05 23:32:21 +00002702 [ARM only] If these variables are defined, then
2703 certain low level initializations (like setting up
2704 the memory controller) are omitted and/or U-Boot does
2705 not relocate itself into RAM.
2706 Normally these variables MUST NOT be defined. The
2707 only exception is when U-Boot is loaded (to RAM) by
2708 some other boot loader or by a debugger which
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002709 performs these initializations itself.
wdenk8aa1a2d2005-04-04 12:44:11 +00002710
Magnus Liljadf812382009-06-13 20:50:00 +02002711- CONFIG_PRELOADER
2712
2713 Modifies the behaviour of start.S when compiling a loader
2714 that is executed before the actual U-Boot. E.g. when
2715 compiling a NAND SPL.
wdenk400558b2005-04-02 23:52:25 +00002716
wdenkc6097192002-11-03 00:24:07 +00002717Building the Software:
2718======================
2719
Wolfgang Denk218ca722008-03-26 10:40:12 +01002720Building U-Boot has been tested in several native build environments
2721and in many different cross environments. Of course we cannot support
2722all possibly existing versions of cross development tools in all
2723(potentially obsolete) versions. In case of tool chain problems we
2724recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
2725which is extensively used to build and test U-Boot.
wdenkc6097192002-11-03 00:24:07 +00002726
Wolfgang Denk218ca722008-03-26 10:40:12 +01002727If you are not using a native environment, it is assumed that you
2728have GNU cross compiling tools available in your path. In this case,
2729you must set the environment variable CROSS_COMPILE in your shell.
2730Note that no changes to the Makefile or any other source files are
2731necessary. For example using the ELDK on a 4xx CPU, please enter:
wdenkc6097192002-11-03 00:24:07 +00002732
Wolfgang Denk218ca722008-03-26 10:40:12 +01002733 $ CROSS_COMPILE=ppc_4xx-
2734 $ export CROSS_COMPILE
wdenkc6097192002-11-03 00:24:07 +00002735
Peter Tyser2f8d3962009-03-13 18:54:51 -05002736Note: If you wish to generate Windows versions of the utilities in
2737 the tools directory you can use the MinGW toolchain
2738 (http://www.mingw.org). Set your HOST tools to the MinGW
2739 toolchain and execute 'make tools'. For example:
2740
2741 $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
2742
2743 Binaries such as tools/mkimage.exe will be created which can
2744 be executed on computers running Windows.
2745
Wolfgang Denk218ca722008-03-26 10:40:12 +01002746U-Boot is intended to be simple to build. After installing the
2747sources you must configure U-Boot for one specific board type. This
wdenkc6097192002-11-03 00:24:07 +00002748is done by typing:
2749
2750 make NAME_config
2751
Wolfgang Denk218ca722008-03-26 10:40:12 +01002752where "NAME_config" is the name of one of the existing configu-
2753rations; see the main Makefile for supported names.
wdenk54387ac2003-10-08 22:45:44 +00002754
wdenk2729af92004-05-03 20:45:30 +00002755Note: for some board special configuration names may exist; check if
2756 additional information is available from the board vendor; for
2757 instance, the TQM823L systems are available without (standard)
2758 or with LCD support. You can select such additional "features"
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002759 when choosing the configuration, i. e.
wdenkc6097192002-11-03 00:24:07 +00002760
wdenk2729af92004-05-03 20:45:30 +00002761 make TQM823L_config
2762 - will configure for a plain TQM823L, i. e. no LCD support
wdenkc6097192002-11-03 00:24:07 +00002763
wdenk2729af92004-05-03 20:45:30 +00002764 make TQM823L_LCD_config
2765 - will configure for a TQM823L with U-Boot console on LCD
wdenkc6097192002-11-03 00:24:07 +00002766
wdenk2729af92004-05-03 20:45:30 +00002767 etc.
wdenkc6097192002-11-03 00:24:07 +00002768
wdenkc6097192002-11-03 00:24:07 +00002769
wdenk2729af92004-05-03 20:45:30 +00002770Finally, type "make all", and you should get some working U-Boot
2771images ready for download to / installation on your system:
wdenkc6097192002-11-03 00:24:07 +00002772
wdenk2729af92004-05-03 20:45:30 +00002773- "u-boot.bin" is a raw binary image
2774- "u-boot" is an image in ELF binary format
2775- "u-boot.srec" is in Motorola S-Record format
wdenkc6097192002-11-03 00:24:07 +00002776
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002777By default the build is performed locally and the objects are saved
2778in the source directory. One of the two methods can be used to change
2779this behavior and build U-Boot to some external directory:
2780
27811. Add O= to the make command line invocations:
2782
2783 make O=/tmp/build distclean
2784 make O=/tmp/build NAME_config
2785 make O=/tmp/build all
2786
27872. Set environment variable BUILD_DIR to point to the desired location:
2788
2789 export BUILD_DIR=/tmp/build
2790 make distclean
2791 make NAME_config
2792 make all
2793
2794Note that the command line "O=" setting overrides the BUILD_DIR environment
2795variable.
2796
wdenkc6097192002-11-03 00:24:07 +00002797
wdenk2729af92004-05-03 20:45:30 +00002798Please be aware that the Makefiles assume you are using GNU make, so
2799for instance on NetBSD you might need to use "gmake" instead of
2800native "make".
wdenkc6097192002-11-03 00:24:07 +00002801
wdenkc6097192002-11-03 00:24:07 +00002802
wdenk2729af92004-05-03 20:45:30 +00002803If the system board that you have is not listed, then you will need
2804to port U-Boot to your hardware platform. To do this, follow these
2805steps:
wdenkc6097192002-11-03 00:24:07 +00002806
wdenk2729af92004-05-03 20:45:30 +000028071. Add a new configuration option for your board to the toplevel
2808 "Makefile" and to the "MAKEALL" script, using the existing
2809 entries as examples. Note that here and at many other places
2810 boards and other names are listed in alphabetical sort order. Please
2811 keep this order.
28122. Create a new directory to hold your board specific code. Add any
2813 files you need. In your board directory, you will need at least
2814 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
28153. Create a new configuration file "include/configs/<board>.h" for
2816 your board
28173. If you're porting U-Boot to a new CPU, then also create a new
2818 directory to hold your CPU specific code. Add any files you need.
28194. Run "make <board>_config" with your new name.
28205. Type "make", and you should get a working "u-boot.srec" file
2821 to be installed on your target system.
28226. Debug and solve any problems that might arise.
2823 [Of course, this last step is much harder than it sounds.]
wdenkc6097192002-11-03 00:24:07 +00002824
wdenkc6097192002-11-03 00:24:07 +00002825
wdenk2729af92004-05-03 20:45:30 +00002826Testing of U-Boot Modifications, Ports to New Hardware, etc.:
2827==============================================================
wdenkc6097192002-11-03 00:24:07 +00002828
Wolfgang Denk218ca722008-03-26 10:40:12 +01002829If you have modified U-Boot sources (for instance added a new board
2830or support for new devices, a new CPU, etc.) you are expected to
wdenk2729af92004-05-03 20:45:30 +00002831provide feedback to the other developers. The feedback normally takes
2832the form of a "patch", i. e. a context diff against a certain (latest
Wolfgang Denk218ca722008-03-26 10:40:12 +01002833official or latest in the git repository) version of U-Boot sources.
wdenkc6097192002-11-03 00:24:07 +00002834
Wolfgang Denk218ca722008-03-26 10:40:12 +01002835But before you submit such a patch, please verify that your modifi-
2836cation did not break existing code. At least make sure that *ALL* of
wdenk2729af92004-05-03 20:45:30 +00002837the supported boards compile WITHOUT ANY compiler warnings. To do so,
2838just run the "MAKEALL" script, which will configure and build U-Boot
Wolfgang Denk218ca722008-03-26 10:40:12 +01002839for ALL supported system. Be warned, this will take a while. You can
2840select which (cross) compiler to use by passing a `CROSS_COMPILE'
2841environment variable to the script, i. e. to use the ELDK cross tools
2842you can type
wdenkc6097192002-11-03 00:24:07 +00002843
wdenk2729af92004-05-03 20:45:30 +00002844 CROSS_COMPILE=ppc_8xx- MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002845
wdenk2729af92004-05-03 20:45:30 +00002846or to build on a native PowerPC system you can type
wdenkc6097192002-11-03 00:24:07 +00002847
wdenk2729af92004-05-03 20:45:30 +00002848 CROSS_COMPILE=' ' MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002849
Wolfgang Denk218ca722008-03-26 10:40:12 +01002850When using the MAKEALL script, the default behaviour is to build
2851U-Boot in the source directory. This location can be changed by
2852setting the BUILD_DIR environment variable. Also, for each target
2853built, the MAKEALL script saves two log files (<target>.ERR and
2854<target>.MAKEALL) in the <source dir>/LOG directory. This default
2855location can be changed by setting the MAKEALL_LOGDIR environment
2856variable. For example:
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002857
2858 export BUILD_DIR=/tmp/build
2859 export MAKEALL_LOGDIR=/tmp/log
2860 CROSS_COMPILE=ppc_8xx- MAKEALL
2861
Wolfgang Denk218ca722008-03-26 10:40:12 +01002862With the above settings build objects are saved in the /tmp/build,
2863log files are saved in the /tmp/log and the source tree remains clean
2864during the whole build process.
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002865
2866
wdenk2729af92004-05-03 20:45:30 +00002867See also "U-Boot Porting Guide" below.
wdenkc6097192002-11-03 00:24:07 +00002868
wdenkc6097192002-11-03 00:24:07 +00002869
wdenk2729af92004-05-03 20:45:30 +00002870Monitor Commands - Overview:
2871============================
wdenkc6097192002-11-03 00:24:07 +00002872
wdenk2729af92004-05-03 20:45:30 +00002873go - start application at address 'addr'
2874run - run commands in an environment variable
2875bootm - boot application image from memory
2876bootp - boot image via network using BootP/TFTP protocol
2877tftpboot- boot image via network using TFTP protocol
2878 and env variables "ipaddr" and "serverip"
2879 (and eventually "gatewayip")
2880rarpboot- boot image via network using RARP/TFTP protocol
2881diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
2882loads - load S-Record file over serial line
2883loadb - load binary file over serial line (kermit mode)
2884md - memory display
2885mm - memory modify (auto-incrementing)
2886nm - memory modify (constant address)
2887mw - memory write (fill)
2888cp - memory copy
2889cmp - memory compare
2890crc32 - checksum calculation
Peter Tyser0f89c542009-04-18 22:34:03 -05002891i2c - I2C sub-system
wdenk2729af92004-05-03 20:45:30 +00002892sspi - SPI utility commands
2893base - print or set address offset
2894printenv- print environment variables
2895setenv - set environment variables
2896saveenv - save environment variables to persistent storage
2897protect - enable or disable FLASH write protection
2898erase - erase FLASH memory
2899flinfo - print FLASH memory information
2900bdinfo - print Board Info structure
2901iminfo - print header information for application image
2902coninfo - print console devices and informations
2903ide - IDE sub-system
2904loop - infinite loop on address range
wdenk56523f12004-07-11 17:40:54 +00002905loopw - infinite write loop on address range
wdenk2729af92004-05-03 20:45:30 +00002906mtest - simple RAM test
2907icache - enable or disable instruction cache
2908dcache - enable or disable data cache
2909reset - Perform RESET of the CPU
2910echo - echo args to console
2911version - print monitor version
2912help - print online help
2913? - alias for 'help'
wdenkc6097192002-11-03 00:24:07 +00002914
wdenkc6097192002-11-03 00:24:07 +00002915
wdenk2729af92004-05-03 20:45:30 +00002916Monitor Commands - Detailed Description:
2917========================================
wdenkc6097192002-11-03 00:24:07 +00002918
wdenk2729af92004-05-03 20:45:30 +00002919TODO.
wdenkc6097192002-11-03 00:24:07 +00002920
wdenk2729af92004-05-03 20:45:30 +00002921For now: just type "help <command>".
wdenkc6097192002-11-03 00:24:07 +00002922
2923
wdenk2729af92004-05-03 20:45:30 +00002924Environment Variables:
2925======================
wdenkc6097192002-11-03 00:24:07 +00002926
wdenk2729af92004-05-03 20:45:30 +00002927U-Boot supports user configuration using Environment Variables which
2928can be made persistent by saving to Flash memory.
wdenkc6097192002-11-03 00:24:07 +00002929
wdenk2729af92004-05-03 20:45:30 +00002930Environment Variables are set using "setenv", printed using
2931"printenv", and saved to Flash using "saveenv". Using "setenv"
2932without a value can be used to delete a variable from the
2933environment. As long as you don't save the environment you are
2934working with an in-memory copy. In case the Flash area containing the
2935environment is erased by accident, a default environment is provided.
wdenkc6097192002-11-03 00:24:07 +00002936
wdenk2729af92004-05-03 20:45:30 +00002937Some configuration options can be set using Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002938
wdenk2729af92004-05-03 20:45:30 +00002939 baudrate - see CONFIG_BAUDRATE
wdenkc6097192002-11-03 00:24:07 +00002940
wdenk2729af92004-05-03 20:45:30 +00002941 bootdelay - see CONFIG_BOOTDELAY
wdenkc6097192002-11-03 00:24:07 +00002942
wdenk2729af92004-05-03 20:45:30 +00002943 bootcmd - see CONFIG_BOOTCOMMAND
wdenkc6097192002-11-03 00:24:07 +00002944
wdenk2729af92004-05-03 20:45:30 +00002945 bootargs - Boot arguments when booting an RTOS image
wdenkc6097192002-11-03 00:24:07 +00002946
wdenk2729af92004-05-03 20:45:30 +00002947 bootfile - Name of the image to load with TFTP
wdenkc6097192002-11-03 00:24:07 +00002948
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02002949 bootm_low - Memory range available for image processing in the bootm
2950 command can be restricted. This variable is given as
2951 a hexadecimal number and defines lowest address allowed
2952 for use by the bootm command. See also "bootm_size"
2953 environment variable. Address defined by "bootm_low" is
2954 also the base of the initial memory mapping for the Linux
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002955 kernel -- see the description of CONFIG_SYS_BOOTMAPSZ.
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02002956
2957 bootm_size - Memory range available for image processing in the bootm
2958 command can be restricted. This variable is given as
2959 a hexadecimal number and defines the size of the region
2960 allowed for use by the bootm command. See also "bootm_low"
2961 environment variable.
2962
Bartlomiej Sieka4bae9092008-10-01 15:26:31 +02002963 updatefile - Location of the software update file on a TFTP server, used
2964 by the automatic software update feature. Please refer to
2965 documentation in doc/README.update for more details.
2966
wdenk2729af92004-05-03 20:45:30 +00002967 autoload - if set to "no" (any string beginning with 'n'),
2968 "bootp" will just load perform a lookup of the
2969 configuration from the BOOTP server, but not try to
2970 load any image using TFTP
wdenkc6097192002-11-03 00:24:07 +00002971
Marian Balakowicz3310c542008-03-12 12:13:13 +01002972 autoscript - if set to "yes" commands like "loadb", "loady",
2973 "bootp", "tftpb", "rarpboot" and "nfs" will attempt
2974 to automatically run script images (by internally
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02002975 calling "source").
Marian Balakowicz3310c542008-03-12 12:13:13 +01002976
2977 autoscript_uname - if script image is in a format (FIT) this
2978 variable is used to get script subimage unit name.
2979
wdenk2729af92004-05-03 20:45:30 +00002980 autostart - if set to "yes", an image loaded using the "bootp",
2981 "rarpboot", "tftpboot" or "diskboot" commands will
2982 be automatically started (by internally calling
2983 "bootm")
wdenkc6097192002-11-03 00:24:07 +00002984
wdenk2729af92004-05-03 20:45:30 +00002985 If set to "no", a standalone image passed to the
2986 "bootm" command will be copied to the load address
2987 (and eventually uncompressed), but NOT be started.
2988 This can be used to load and uncompress arbitrary
2989 data.
wdenkc6097192002-11-03 00:24:07 +00002990
wdenk17ea1172004-06-06 21:51:03 +00002991 i2cfast - (PPC405GP|PPC405EP only)
2992 if set to 'y' configures Linux I2C driver for fast
2993 mode (400kHZ). This environment variable is used in
2994 initialization code. So, for changes to be effective
2995 it must be saved and board must be reset.
2996
wdenk2729af92004-05-03 20:45:30 +00002997 initrd_high - restrict positioning of initrd images:
2998 If this variable is not set, initrd images will be
2999 copied to the highest possible address in RAM; this
3000 is usually what you want since it allows for
3001 maximum initrd size. If for some reason you want to
3002 make sure that the initrd image is loaded below the
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003003 CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
wdenk2729af92004-05-03 20:45:30 +00003004 variable to a value of "no" or "off" or "0".
3005 Alternatively, you can set it to a maximum upper
3006 address to use (U-Boot will still check that it
3007 does not overwrite the U-Boot stack and data).
wdenkc6097192002-11-03 00:24:07 +00003008
wdenk2729af92004-05-03 20:45:30 +00003009 For instance, when you have a system with 16 MB
3010 RAM, and want to reserve 4 MB from use by Linux,
3011 you can do this by adding "mem=12M" to the value of
3012 the "bootargs" variable. However, now you must make
3013 sure that the initrd image is placed in the first
3014 12 MB as well - this can be done with
wdenkc6097192002-11-03 00:24:07 +00003015
wdenk2729af92004-05-03 20:45:30 +00003016 setenv initrd_high 00c00000
wdenkc6097192002-11-03 00:24:07 +00003017
wdenk2729af92004-05-03 20:45:30 +00003018 If you set initrd_high to 0xFFFFFFFF, this is an
3019 indication to U-Boot that all addresses are legal
3020 for the Linux kernel, including addresses in flash
3021 memory. In this case U-Boot will NOT COPY the
3022 ramdisk at all. This may be useful to reduce the
3023 boot time on your system, but requires that this
3024 feature is supported by your Linux kernel.
wdenk4a6fd342003-04-12 23:38:12 +00003025
wdenk2729af92004-05-03 20:45:30 +00003026 ipaddr - IP address; needed for tftpboot command
wdenkc6097192002-11-03 00:24:07 +00003027
wdenk2729af92004-05-03 20:45:30 +00003028 loadaddr - Default load address for commands like "bootp",
3029 "rarpboot", "tftpboot", "loadb" or "diskboot"
wdenkc6097192002-11-03 00:24:07 +00003030
wdenk2729af92004-05-03 20:45:30 +00003031 loads_echo - see CONFIG_LOADS_ECHO
wdenkc6097192002-11-03 00:24:07 +00003032
wdenk2729af92004-05-03 20:45:30 +00003033 serverip - TFTP server IP address; needed for tftpboot command
wdenk38b99262003-05-23 23:18:21 +00003034
wdenk2729af92004-05-03 20:45:30 +00003035 bootretry - see CONFIG_BOOT_RETRY_TIME
wdenkc6097192002-11-03 00:24:07 +00003036
wdenk2729af92004-05-03 20:45:30 +00003037 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
wdenkc6097192002-11-03 00:24:07 +00003038
wdenk2729af92004-05-03 20:45:30 +00003039 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
wdenkc6097192002-11-03 00:24:07 +00003040
wdenk2729af92004-05-03 20:45:30 +00003041 ethprime - When CONFIG_NET_MULTI is enabled controls which
3042 interface is used first.
wdenkc6097192002-11-03 00:24:07 +00003043
wdenk2729af92004-05-03 20:45:30 +00003044 ethact - When CONFIG_NET_MULTI is enabled controls which
3045 interface is currently active. For example you
3046 can do the following
wdenkc6097192002-11-03 00:24:07 +00003047
wdenk2729af92004-05-03 20:45:30 +00003048 => setenv ethact FEC ETHERNET
3049 => ping 192.168.0.1 # traffic sent on FEC ETHERNET
3050 => setenv ethact SCC ETHERNET
3051 => ping 10.0.0.1 # traffic sent on SCC ETHERNET
wdenkc6097192002-11-03 00:24:07 +00003052
Matthias Fuchse1692572008-01-17 07:45:05 +01003053 ethrotate - When set to "no" U-Boot does not go through all
3054 available network interfaces.
3055 It just stays at the currently selected interface.
3056
wdenk2729af92004-05-03 20:45:30 +00003057 netretry - When set to "no" each network operation will
3058 either succeed or fail without retrying.
3059 When set to "once" the network operation will
3060 fail when all the available network interfaces
3061 are tried once without success.
3062 Useful on scripts which control the retry operation
3063 themselves.
wdenkc6097192002-11-03 00:24:07 +00003064
Jean-Christophe PLAGNIOL-VILLARDb4e2f892009-01-31 09:53:39 +01003065 npe_ucode - set load address for the NPE microcode
Jean-Christophe PLAGNIOL-VILLARDa1cf0272008-01-07 08:41:34 +01003066
Wolfgang Denk28cb9372005-09-24 23:25:46 +02003067 tftpsrcport - If this is set, the value is used for TFTP's
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02003068 UDP source port.
3069
Wolfgang Denk28cb9372005-09-24 23:25:46 +02003070 tftpdstport - If this is set, the value is used for TFTP's UDP
3071 destination port instead of the Well Know Port 69.
3072
wdenk2729af92004-05-03 20:45:30 +00003073 vlan - When set to a value < 4095 the traffic over
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003074 Ethernet is encapsulated/received over 802.1q
wdenk2729af92004-05-03 20:45:30 +00003075 VLAN tagged frames.
wdenka3d991b2004-04-15 21:48:45 +00003076
wdenk2729af92004-05-03 20:45:30 +00003077The following environment variables may be used and automatically
3078updated by the network boot commands ("bootp" and "rarpboot"),
3079depending the information provided by your boot server:
wdenka3d991b2004-04-15 21:48:45 +00003080
wdenk2729af92004-05-03 20:45:30 +00003081 bootfile - see above
3082 dnsip - IP address of your Domain Name Server
3083 dnsip2 - IP address of your secondary Domain Name Server
3084 gatewayip - IP address of the Gateway (Router) to use
3085 hostname - Target hostname
3086 ipaddr - see above
3087 netmask - Subnet Mask
3088 rootpath - Pathname of the root filesystem on the NFS server
3089 serverip - see above
wdenka3d991b2004-04-15 21:48:45 +00003090
wdenka3d991b2004-04-15 21:48:45 +00003091
wdenk2729af92004-05-03 20:45:30 +00003092There are two special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00003093
wdenk2729af92004-05-03 20:45:30 +00003094 serial# - contains hardware identification information such
3095 as type string and/or serial number
3096 ethaddr - Ethernet address
wdenkc6097192002-11-03 00:24:07 +00003097
wdenk2729af92004-05-03 20:45:30 +00003098These variables can be set only once (usually during manufacturing of
3099the board). U-Boot refuses to delete or overwrite these variables
3100once they have been set once.
wdenkc6097192002-11-03 00:24:07 +00003101
3102
wdenk2729af92004-05-03 20:45:30 +00003103Further special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00003104
wdenk2729af92004-05-03 20:45:30 +00003105 ver - Contains the U-Boot version string as printed
3106 with the "version" command. This variable is
3107 readonly (see CONFIG_VERSION_VARIABLE).
wdenkc6097192002-11-03 00:24:07 +00003108
wdenkc6097192002-11-03 00:24:07 +00003109
wdenk2729af92004-05-03 20:45:30 +00003110Please note that changes to some configuration parameters may take
3111only effect after the next boot (yes, that's just like Windoze :-).
wdenkc6097192002-11-03 00:24:07 +00003112
stroesec1551ea2003-04-04 15:53:41 +00003113
wdenk2729af92004-05-03 20:45:30 +00003114Command Line Parsing:
3115=====================
stroesec1551ea2003-04-04 15:53:41 +00003116
wdenk2729af92004-05-03 20:45:30 +00003117There are two different command line parsers available with U-Boot:
3118the old "simple" one, and the much more powerful "hush" shell:
stroesec1551ea2003-04-04 15:53:41 +00003119
wdenk2729af92004-05-03 20:45:30 +00003120Old, simple command line parser:
3121--------------------------------
wdenkc6097192002-11-03 00:24:07 +00003122
wdenk2729af92004-05-03 20:45:30 +00003123- supports environment variables (through setenv / saveenv commands)
3124- several commands on one line, separated by ';'
Wolfgang Denkfe126d82005-11-20 21:40:11 +01003125- variable substitution using "... ${name} ..." syntax
wdenk2729af92004-05-03 20:45:30 +00003126- special characters ('$', ';') can be escaped by prefixing with '\',
3127 for example:
Wolfgang Denkfe126d82005-11-20 21:40:11 +01003128 setenv bootcmd bootm \${address}
wdenk2729af92004-05-03 20:45:30 +00003129- You can also escape text by enclosing in single apostrophes, for example:
3130 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
wdenkc6097192002-11-03 00:24:07 +00003131
wdenk2729af92004-05-03 20:45:30 +00003132Hush shell:
3133-----------
wdenkf07771c2003-05-28 08:06:31 +00003134
wdenk2729af92004-05-03 20:45:30 +00003135- similar to Bourne shell, with control structures like
3136 if...then...else...fi, for...do...done; while...do...done,
3137 until...do...done, ...
3138- supports environment ("global") variables (through setenv / saveenv
3139 commands) and local shell variables (through standard shell syntax
3140 "name=value"); only environment variables can be used with "run"
3141 command
wdenkf07771c2003-05-28 08:06:31 +00003142
wdenk2729af92004-05-03 20:45:30 +00003143General rules:
3144--------------
wdenkf07771c2003-05-28 08:06:31 +00003145
wdenk2729af92004-05-03 20:45:30 +00003146(1) If a command line (or an environment variable executed by a "run"
3147 command) contains several commands separated by semicolon, and
3148 one of these commands fails, then the remaining commands will be
3149 executed anyway.
wdenkf07771c2003-05-28 08:06:31 +00003150
wdenk2729af92004-05-03 20:45:30 +00003151(2) If you execute several variables with one call to run (i. e.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003152 calling run with a list of variables as arguments), any failing
wdenk2729af92004-05-03 20:45:30 +00003153 command will cause "run" to terminate, i. e. the remaining
3154 variables are not executed.
wdenkf07771c2003-05-28 08:06:31 +00003155
wdenk2729af92004-05-03 20:45:30 +00003156Note for Redundant Ethernet Interfaces:
3157=======================================
wdenkf07771c2003-05-28 08:06:31 +00003158
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003159Some boards come with redundant Ethernet interfaces; U-Boot supports
wdenk2729af92004-05-03 20:45:30 +00003160such configurations and is capable of automatic selection of a
3161"working" interface when needed. MAC assignment works as follows:
wdenkf07771c2003-05-28 08:06:31 +00003162
wdenk2729af92004-05-03 20:45:30 +00003163Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
3164MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3165"eth1addr" (=>eth1), "eth2addr", ...
wdenkf07771c2003-05-28 08:06:31 +00003166
wdenk2729af92004-05-03 20:45:30 +00003167If the network interface stores some valid MAC address (for instance
3168in SROM), this is used as default address if there is NO correspon-
3169ding setting in the environment; if the corresponding environment
3170variable is set, this overrides the settings in the card; that means:
wdenkf07771c2003-05-28 08:06:31 +00003171
wdenk2729af92004-05-03 20:45:30 +00003172o If the SROM has a valid MAC address, and there is no address in the
3173 environment, the SROM's address is used.
wdenkc6097192002-11-03 00:24:07 +00003174
wdenk2729af92004-05-03 20:45:30 +00003175o If there is no valid address in the SROM, and a definition in the
3176 environment exists, then the value from the environment variable is
3177 used.
wdenkc6097192002-11-03 00:24:07 +00003178
wdenk2729af92004-05-03 20:45:30 +00003179o If both the SROM and the environment contain a MAC address, and
3180 both addresses are the same, this MAC address is used.
wdenkc6097192002-11-03 00:24:07 +00003181
wdenk2729af92004-05-03 20:45:30 +00003182o If both the SROM and the environment contain a MAC address, and the
3183 addresses differ, the value from the environment is used and a
3184 warning is printed.
wdenkc6097192002-11-03 00:24:07 +00003185
wdenk2729af92004-05-03 20:45:30 +00003186o If neither SROM nor the environment contain a MAC address, an error
3187 is raised.
wdenkc6097192002-11-03 00:24:07 +00003188
wdenkc6097192002-11-03 00:24:07 +00003189
wdenk2729af92004-05-03 20:45:30 +00003190Image Formats:
3191==============
wdenkc6097192002-11-03 00:24:07 +00003192
Marian Balakowicz3310c542008-03-12 12:13:13 +01003193U-Boot is capable of booting (and performing other auxiliary operations on)
3194images in two formats:
3195
3196New uImage format (FIT)
3197-----------------------
3198
3199Flexible and powerful format based on Flattened Image Tree -- FIT (similar
3200to Flattened Device Tree). It allows the use of images with multiple
3201components (several kernels, ramdisks, etc.), with contents protected by
3202SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
3203
3204
3205Old uImage format
3206-----------------
3207
3208Old image format is based on binary files which can be basically anything,
3209preceded by a special header; see the definitions in include/image.h for
3210details; basically, the header defines the following image properties:
wdenkc6097192002-11-03 00:24:07 +00003211
wdenk2729af92004-05-03 20:45:30 +00003212* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3213 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
Peter Tyserf5ed9e32008-09-08 14:56:49 -05003214 LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
3215 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
3216 INTEGRITY).
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02003217* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
wdenk2729af92004-05-03 20:45:30 +00003218 IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02003219 Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC).
wdenk2729af92004-05-03 20:45:30 +00003220* Compression Type (uncompressed, gzip, bzip2)
3221* Load Address
3222* Entry Point
3223* Image Name
3224* Image Timestamp
wdenkc6097192002-11-03 00:24:07 +00003225
wdenk2729af92004-05-03 20:45:30 +00003226The header is marked by a special Magic Number, and both the header
3227and the data portions of the image are secured against corruption by
3228CRC32 checksums.
wdenkc6097192002-11-03 00:24:07 +00003229
wdenkc6097192002-11-03 00:24:07 +00003230
wdenk2729af92004-05-03 20:45:30 +00003231Linux Support:
3232==============
wdenkc6097192002-11-03 00:24:07 +00003233
wdenk2729af92004-05-03 20:45:30 +00003234Although U-Boot should support any OS or standalone application
3235easily, the main focus has always been on Linux during the design of
3236U-Boot.
wdenkc6097192002-11-03 00:24:07 +00003237
wdenk2729af92004-05-03 20:45:30 +00003238U-Boot includes many features that so far have been part of some
3239special "boot loader" code within the Linux kernel. Also, any
3240"initrd" images to be used are no longer part of one big Linux image;
3241instead, kernel and "initrd" are separate images. This implementation
3242serves several purposes:
wdenkc6097192002-11-03 00:24:07 +00003243
wdenk2729af92004-05-03 20:45:30 +00003244- the same features can be used for other OS or standalone
3245 applications (for instance: using compressed images to reduce the
3246 Flash memory footprint)
wdenkc6097192002-11-03 00:24:07 +00003247
wdenk2729af92004-05-03 20:45:30 +00003248- it becomes much easier to port new Linux kernel versions because
3249 lots of low-level, hardware dependent stuff are done by U-Boot
wdenkc6097192002-11-03 00:24:07 +00003250
wdenk2729af92004-05-03 20:45:30 +00003251- the same Linux kernel image can now be used with different "initrd"
3252 images; of course this also means that different kernel images can
3253 be run with the same "initrd". This makes testing easier (you don't
3254 have to build a new "zImage.initrd" Linux image when you just
3255 change a file in your "initrd"). Also, a field-upgrade of the
3256 software is easier now.
wdenkc6097192002-11-03 00:24:07 +00003257
wdenkc6097192002-11-03 00:24:07 +00003258
wdenk2729af92004-05-03 20:45:30 +00003259Linux HOWTO:
3260============
wdenkc6097192002-11-03 00:24:07 +00003261
wdenk2729af92004-05-03 20:45:30 +00003262Porting Linux to U-Boot based systems:
3263---------------------------------------
wdenkc6097192002-11-03 00:24:07 +00003264
wdenk2729af92004-05-03 20:45:30 +00003265U-Boot cannot save you from doing all the necessary modifications to
3266configure the Linux device drivers for use with your target hardware
3267(no, we don't intend to provide a full virtual machine interface to
3268Linux :-).
wdenkc6097192002-11-03 00:24:07 +00003269
wdenk2729af92004-05-03 20:45:30 +00003270But now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
wdenkc6097192002-11-03 00:24:07 +00003271
wdenk2729af92004-05-03 20:45:30 +00003272Just make sure your machine specific header file (for instance
3273include/asm-ppc/tqm8xx.h) includes the same definition of the Board
Markus Heidelberg1dc30692008-09-07 20:18:27 +02003274Information structure as we define in include/asm-<arch>/u-boot.h,
3275and make sure that your definition of IMAP_ADDR uses the same value
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003276as your U-Boot configuration in CONFIG_SYS_IMMR.
wdenkc6097192002-11-03 00:24:07 +00003277
wdenkc6097192002-11-03 00:24:07 +00003278
wdenk2729af92004-05-03 20:45:30 +00003279Configuring the Linux kernel:
3280-----------------------------
wdenkc6097192002-11-03 00:24:07 +00003281
wdenk2729af92004-05-03 20:45:30 +00003282No specific requirements for U-Boot. Make sure you have some root
3283device (initial ramdisk, NFS) for your target system.
wdenkc6097192002-11-03 00:24:07 +00003284
wdenkc6097192002-11-03 00:24:07 +00003285
wdenk2729af92004-05-03 20:45:30 +00003286Building a Linux Image:
3287-----------------------
wdenkc6097192002-11-03 00:24:07 +00003288
wdenk2729af92004-05-03 20:45:30 +00003289With U-Boot, "normal" build targets like "zImage" or "bzImage" are
3290not used. If you use recent kernel source, a new build target
3291"uImage" will exist which automatically builds an image usable by
3292U-Boot. Most older kernels also have support for a "pImage" target,
3293which was introduced for our predecessor project PPCBoot and uses a
3294100% compatible format.
wdenkc6097192002-11-03 00:24:07 +00003295
wdenk2729af92004-05-03 20:45:30 +00003296Example:
wdenkc6097192002-11-03 00:24:07 +00003297
wdenk2729af92004-05-03 20:45:30 +00003298 make TQM850L_config
3299 make oldconfig
3300 make dep
3301 make uImage
wdenkc6097192002-11-03 00:24:07 +00003302
wdenk2729af92004-05-03 20:45:30 +00003303The "uImage" build target uses a special tool (in 'tools/mkimage') to
3304encapsulate a compressed Linux kernel image with header information,
3305CRC32 checksum etc. for use with U-Boot. This is what we are doing:
wdenkc6097192002-11-03 00:24:07 +00003306
wdenk2729af92004-05-03 20:45:30 +00003307* build a standard "vmlinux" kernel image (in ELF binary format):
wdenkc6097192002-11-03 00:24:07 +00003308
wdenk2729af92004-05-03 20:45:30 +00003309* convert the kernel into a raw binary image:
wdenkc6097192002-11-03 00:24:07 +00003310
wdenk2729af92004-05-03 20:45:30 +00003311 ${CROSS_COMPILE}-objcopy -O binary \
3312 -R .note -R .comment \
3313 -S vmlinux linux.bin
wdenkc6097192002-11-03 00:24:07 +00003314
wdenk2729af92004-05-03 20:45:30 +00003315* compress the binary image:
wdenkc6097192002-11-03 00:24:07 +00003316
wdenk2729af92004-05-03 20:45:30 +00003317 gzip -9 linux.bin
wdenkc6097192002-11-03 00:24:07 +00003318
wdenk2729af92004-05-03 20:45:30 +00003319* package compressed binary image for U-Boot:
wdenk24ee89b2002-11-03 17:56:27 +00003320
wdenk2729af92004-05-03 20:45:30 +00003321 mkimage -A ppc -O linux -T kernel -C gzip \
3322 -a 0 -e 0 -n "Linux Kernel Image" \
3323 -d linux.bin.gz uImage
wdenk24ee89b2002-11-03 17:56:27 +00003324
wdenk24ee89b2002-11-03 17:56:27 +00003325
wdenk2729af92004-05-03 20:45:30 +00003326The "mkimage" tool can also be used to create ramdisk images for use
3327with U-Boot, either separated from the Linux kernel image, or
3328combined into one file. "mkimage" encapsulates the images with a 64
3329byte header containing information about target architecture,
3330operating system, image type, compression method, entry points, time
3331stamp, CRC32 checksums, etc.
wdenk24ee89b2002-11-03 17:56:27 +00003332
wdenk2729af92004-05-03 20:45:30 +00003333"mkimage" can be called in two ways: to verify existing images and
3334print the header information, or to build new images.
wdenk24ee89b2002-11-03 17:56:27 +00003335
wdenk2729af92004-05-03 20:45:30 +00003336In the first form (with "-l" option) mkimage lists the information
3337contained in the header of an existing U-Boot image; this includes
3338checksum verification:
wdenk24ee89b2002-11-03 17:56:27 +00003339
wdenk2729af92004-05-03 20:45:30 +00003340 tools/mkimage -l image
3341 -l ==> list image header information
wdenk24ee89b2002-11-03 17:56:27 +00003342
wdenk2729af92004-05-03 20:45:30 +00003343The second form (with "-d" option) is used to build a U-Boot image
3344from a "data file" which is used as image payload:
wdenk24ee89b2002-11-03 17:56:27 +00003345
wdenk2729af92004-05-03 20:45:30 +00003346 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
3347 -n name -d data_file image
3348 -A ==> set architecture to 'arch'
3349 -O ==> set operating system to 'os'
3350 -T ==> set image type to 'type'
3351 -C ==> set compression type 'comp'
3352 -a ==> set load address to 'addr' (hex)
3353 -e ==> set entry point to 'ep' (hex)
3354 -n ==> set image name to 'name'
3355 -d ==> use image data from 'datafile'
wdenk24ee89b2002-11-03 17:56:27 +00003356
wdenk69459792004-05-29 16:53:29 +00003357Right now, all Linux kernels for PowerPC systems use the same load
3358address (0x00000000), but the entry point address depends on the
3359kernel version:
wdenkc6097192002-11-03 00:24:07 +00003360
wdenk2729af92004-05-03 20:45:30 +00003361- 2.2.x kernels have the entry point at 0x0000000C,
3362- 2.3.x and later kernels have the entry point at 0x00000000.
wdenkc6097192002-11-03 00:24:07 +00003363
wdenk2729af92004-05-03 20:45:30 +00003364So a typical call to build a U-Boot image would read:
wdenkc6097192002-11-03 00:24:07 +00003365
wdenk2729af92004-05-03 20:45:30 +00003366 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3367 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
3368 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
3369 > examples/uImage.TQM850L
3370 Image Name: 2.4.4 kernel for TQM850L
3371 Created: Wed Jul 19 02:34:59 2000
3372 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3373 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3374 Load Address: 0x00000000
3375 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003376
wdenk2729af92004-05-03 20:45:30 +00003377To verify the contents of the image (or check for corruption):
wdenkc6097192002-11-03 00:24:07 +00003378
wdenk2729af92004-05-03 20:45:30 +00003379 -> tools/mkimage -l examples/uImage.TQM850L
3380 Image Name: 2.4.4 kernel for TQM850L
3381 Created: Wed Jul 19 02:34:59 2000
3382 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3383 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3384 Load Address: 0x00000000
3385 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003386
wdenk2729af92004-05-03 20:45:30 +00003387NOTE: for embedded systems where boot time is critical you can trade
3388speed for memory and install an UNCOMPRESSED image instead: this
3389needs more space in Flash, but boots much faster since it does not
3390need to be uncompressed:
wdenkc6097192002-11-03 00:24:07 +00003391
wdenk2729af92004-05-03 20:45:30 +00003392 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
3393 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3394 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3395 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
3396 > examples/uImage.TQM850L-uncompressed
3397 Image Name: 2.4.4 kernel for TQM850L
3398 Created: Wed Jul 19 02:34:59 2000
3399 Image Type: PowerPC Linux Kernel Image (uncompressed)
3400 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
3401 Load Address: 0x00000000
3402 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003403
wdenkc6097192002-11-03 00:24:07 +00003404
wdenk2729af92004-05-03 20:45:30 +00003405Similar you can build U-Boot images from a 'ramdisk.image.gz' file
3406when your kernel is intended to use an initial ramdisk:
wdenkdb01a2e2004-04-15 23:14:49 +00003407
wdenk2729af92004-05-03 20:45:30 +00003408 -> tools/mkimage -n 'Simple Ramdisk Image' \
3409 > -A ppc -O linux -T ramdisk -C gzip \
3410 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3411 Image Name: Simple Ramdisk Image
3412 Created: Wed Jan 12 14:01:50 2000
3413 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3414 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
3415 Load Address: 0x00000000
3416 Entry Point: 0x00000000
wdenkdb01a2e2004-04-15 23:14:49 +00003417
wdenkdb01a2e2004-04-15 23:14:49 +00003418
wdenk2729af92004-05-03 20:45:30 +00003419Installing a Linux Image:
3420-------------------------
wdenkdb01a2e2004-04-15 23:14:49 +00003421
wdenk2729af92004-05-03 20:45:30 +00003422To downloading a U-Boot image over the serial (console) interface,
3423you must convert the image to S-Record format:
wdenkdb01a2e2004-04-15 23:14:49 +00003424
wdenk2729af92004-05-03 20:45:30 +00003425 objcopy -I binary -O srec examples/image examples/image.srec
wdenkdb01a2e2004-04-15 23:14:49 +00003426
wdenk2729af92004-05-03 20:45:30 +00003427The 'objcopy' does not understand the information in the U-Boot
3428image header, so the resulting S-Record file will be relative to
3429address 0x00000000. To load it to a given address, you need to
3430specify the target address as 'offset' parameter with the 'loads'
3431command.
wdenkc6097192002-11-03 00:24:07 +00003432
wdenk2729af92004-05-03 20:45:30 +00003433Example: install the image to address 0x40100000 (which on the
3434TQM8xxL is in the first Flash bank):
wdenkc6097192002-11-03 00:24:07 +00003435
wdenk2729af92004-05-03 20:45:30 +00003436 => erase 40100000 401FFFFF
wdenkc6097192002-11-03 00:24:07 +00003437
wdenk2729af92004-05-03 20:45:30 +00003438 .......... done
3439 Erased 8 sectors
wdenkc6097192002-11-03 00:24:07 +00003440
wdenk2729af92004-05-03 20:45:30 +00003441 => loads 40100000
3442 ## Ready for S-Record download ...
3443 ~>examples/image.srec
3444 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3445 ...
3446 15989 15990 15991 15992
3447 [file transfer complete]
3448 [connected]
3449 ## Start Addr = 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003450
3451
wdenk2729af92004-05-03 20:45:30 +00003452You can check the success of the download using the 'iminfo' command;
Wolfgang Denk218ca722008-03-26 10:40:12 +01003453this includes a checksum verification so you can be sure no data
wdenk2729af92004-05-03 20:45:30 +00003454corruption happened:
wdenkc6097192002-11-03 00:24:07 +00003455
wdenk2729af92004-05-03 20:45:30 +00003456 => imi 40100000
wdenkc6097192002-11-03 00:24:07 +00003457
wdenk2729af92004-05-03 20:45:30 +00003458 ## Checking Image at 40100000 ...
3459 Image Name: 2.2.13 for initrd on TQM850L
3460 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3461 Data Size: 335725 Bytes = 327 kB = 0 MB
3462 Load Address: 00000000
3463 Entry Point: 0000000c
3464 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003465
3466
wdenk2729af92004-05-03 20:45:30 +00003467Boot Linux:
3468-----------
wdenkc6097192002-11-03 00:24:07 +00003469
wdenk2729af92004-05-03 20:45:30 +00003470The "bootm" command is used to boot an application that is stored in
3471memory (RAM or Flash). In case of a Linux kernel image, the contents
3472of the "bootargs" environment variable is passed to the kernel as
3473parameters. You can check and modify this variable using the
3474"printenv" and "setenv" commands:
wdenkc6097192002-11-03 00:24:07 +00003475
3476
wdenk2729af92004-05-03 20:45:30 +00003477 => printenv bootargs
3478 bootargs=root=/dev/ram
wdenkc6097192002-11-03 00:24:07 +00003479
wdenk2729af92004-05-03 20:45:30 +00003480 => 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 +00003481
wdenk2729af92004-05-03 20:45:30 +00003482 => printenv bootargs
3483 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 +00003484
wdenk2729af92004-05-03 20:45:30 +00003485 => bootm 40020000
3486 ## Booting Linux kernel at 40020000 ...
3487 Image Name: 2.2.13 for NFS on TQM850L
3488 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3489 Data Size: 381681 Bytes = 372 kB = 0 MB
3490 Load Address: 00000000
3491 Entry Point: 0000000c
3492 Verifying Checksum ... OK
3493 Uncompressing Kernel Image ... OK
3494 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
3495 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3496 time_init: decrementer frequency = 187500000/60
3497 Calibrating delay loop... 49.77 BogoMIPS
3498 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3499 ...
wdenkc6097192002-11-03 00:24:07 +00003500
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003501If you want to boot a Linux kernel with initial RAM disk, you pass
wdenk2729af92004-05-03 20:45:30 +00003502the memory addresses of both the kernel and the initrd image (PPBCOOT
3503format!) to the "bootm" command:
wdenkc6097192002-11-03 00:24:07 +00003504
wdenk2729af92004-05-03 20:45:30 +00003505 => imi 40100000 40200000
wdenkc6097192002-11-03 00:24:07 +00003506
wdenk2729af92004-05-03 20:45:30 +00003507 ## Checking Image at 40100000 ...
3508 Image Name: 2.2.13 for initrd on TQM850L
3509 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3510 Data Size: 335725 Bytes = 327 kB = 0 MB
3511 Load Address: 00000000
3512 Entry Point: 0000000c
3513 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003514
wdenk2729af92004-05-03 20:45:30 +00003515 ## Checking Image at 40200000 ...
3516 Image Name: Simple Ramdisk Image
3517 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3518 Data Size: 566530 Bytes = 553 kB = 0 MB
3519 Load Address: 00000000
3520 Entry Point: 00000000
3521 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003522
wdenk2729af92004-05-03 20:45:30 +00003523 => bootm 40100000 40200000
3524 ## Booting Linux kernel at 40100000 ...
3525 Image Name: 2.2.13 for initrd on TQM850L
3526 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3527 Data Size: 335725 Bytes = 327 kB = 0 MB
3528 Load Address: 00000000
3529 Entry Point: 0000000c
3530 Verifying Checksum ... OK
3531 Uncompressing Kernel Image ... OK
3532 ## Loading RAMDisk Image at 40200000 ...
3533 Image Name: Simple Ramdisk Image
3534 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3535 Data Size: 566530 Bytes = 553 kB = 0 MB
3536 Load Address: 00000000
3537 Entry Point: 00000000
3538 Verifying Checksum ... OK
3539 Loading Ramdisk ... OK
3540 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
3541 Boot arguments: root=/dev/ram
3542 time_init: decrementer frequency = 187500000/60
3543 Calibrating delay loop... 49.77 BogoMIPS
3544 ...
3545 RAMDISK: Compressed image found at block 0
3546 VFS: Mounted root (ext2 filesystem).
wdenkc6097192002-11-03 00:24:07 +00003547
wdenk2729af92004-05-03 20:45:30 +00003548 bash#
wdenkc6097192002-11-03 00:24:07 +00003549
Matthew McClintock02677682006-06-28 10:41:37 -05003550Boot Linux and pass a flat device tree:
3551-----------
3552
3553First, U-Boot must be compiled with the appropriate defines. See the section
3554titled "Linux Kernel Interface" above for a more in depth explanation. The
3555following is an example of how to start a kernel and pass an updated
3556flat device tree:
3557
3558=> print oftaddr
3559oftaddr=0x300000
3560=> print oft
3561oft=oftrees/mpc8540ads.dtb
3562=> tftp $oftaddr $oft
3563Speed: 1000, full duplex
3564Using TSEC0 device
3565TFTP from server 192.168.1.1; our IP address is 192.168.1.101
3566Filename 'oftrees/mpc8540ads.dtb'.
3567Load address: 0x300000
3568Loading: #
3569done
3570Bytes transferred = 4106 (100a hex)
3571=> tftp $loadaddr $bootfile
3572Speed: 1000, full duplex
3573Using TSEC0 device
3574TFTP from server 192.168.1.1; our IP address is 192.168.1.2
3575Filename 'uImage'.
3576Load address: 0x200000
3577Loading:############
3578done
3579Bytes transferred = 1029407 (fb51f hex)
3580=> print loadaddr
3581loadaddr=200000
3582=> print oftaddr
3583oftaddr=0x300000
3584=> bootm $loadaddr - $oftaddr
3585## Booting image at 00200000 ...
Wolfgang Denka9398e02006-11-27 15:32:42 +01003586 Image Name: Linux-2.6.17-dirty
3587 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3588 Data Size: 1029343 Bytes = 1005.2 kB
Matthew McClintock02677682006-06-28 10:41:37 -05003589 Load Address: 00000000
Wolfgang Denka9398e02006-11-27 15:32:42 +01003590 Entry Point: 00000000
Matthew McClintock02677682006-06-28 10:41:37 -05003591 Verifying Checksum ... OK
3592 Uncompressing Kernel Image ... OK
3593Booting using flat device tree at 0x300000
3594Using MPC85xx ADS machine description
3595Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
3596[snip]
3597
3598
wdenk2729af92004-05-03 20:45:30 +00003599More About U-Boot Image Types:
3600------------------------------
wdenk6069ff22003-02-28 00:49:47 +00003601
wdenk2729af92004-05-03 20:45:30 +00003602U-Boot supports the following image types:
wdenk6069ff22003-02-28 00:49:47 +00003603
wdenk2729af92004-05-03 20:45:30 +00003604 "Standalone Programs" are directly runnable in the environment
3605 provided by U-Boot; it is expected that (if they behave
3606 well) you can continue to work in U-Boot after return from
3607 the Standalone Program.
3608 "OS Kernel Images" are usually images of some Embedded OS which
3609 will take over control completely. Usually these programs
3610 will install their own set of exception handlers, device
3611 drivers, set up the MMU, etc. - this means, that you cannot
3612 expect to re-enter U-Boot except by resetting the CPU.
3613 "RAMDisk Images" are more or less just data blocks, and their
3614 parameters (address, size) are passed to an OS kernel that is
3615 being started.
3616 "Multi-File Images" contain several images, typically an OS
3617 (Linux) kernel image and one or more data images like
3618 RAMDisks. This construct is useful for instance when you want
3619 to boot over the network using BOOTP etc., where the boot
3620 server provides just a single image file, but you want to get
3621 for instance an OS kernel and a RAMDisk image.
stroesec1551ea2003-04-04 15:53:41 +00003622
wdenk2729af92004-05-03 20:45:30 +00003623 "Multi-File Images" start with a list of image sizes, each
3624 image size (in bytes) specified by an "uint32_t" in network
3625 byte order. This list is terminated by an "(uint32_t)0".
3626 Immediately after the terminating 0 follow the images, one by
3627 one, all aligned on "uint32_t" boundaries (size rounded up to
3628 a multiple of 4 bytes).
stroesec1551ea2003-04-04 15:53:41 +00003629
wdenk2729af92004-05-03 20:45:30 +00003630 "Firmware Images" are binary images containing firmware (like
3631 U-Boot or FPGA images) which usually will be programmed to
3632 flash memory.
stroesec1551ea2003-04-04 15:53:41 +00003633
wdenk2729af92004-05-03 20:45:30 +00003634 "Script files" are command sequences that will be executed by
3635 U-Boot's command interpreter; this feature is especially
3636 useful when you configure U-Boot to use a real shell (hush)
3637 as command interpreter.
wdenk6069ff22003-02-28 00:49:47 +00003638
wdenkc6097192002-11-03 00:24:07 +00003639
wdenk2729af92004-05-03 20:45:30 +00003640Standalone HOWTO:
3641=================
wdenkc6097192002-11-03 00:24:07 +00003642
wdenk2729af92004-05-03 20:45:30 +00003643One of the features of U-Boot is that you can dynamically load and
3644run "standalone" applications, which can use some resources of
3645U-Boot like console I/O functions or interrupt services.
wdenkc6097192002-11-03 00:24:07 +00003646
wdenk2729af92004-05-03 20:45:30 +00003647Two simple examples are included with the sources:
wdenkc6097192002-11-03 00:24:07 +00003648
wdenk2729af92004-05-03 20:45:30 +00003649"Hello World" Demo:
3650-------------------
wdenkc6097192002-11-03 00:24:07 +00003651
wdenk2729af92004-05-03 20:45:30 +00003652'examples/hello_world.c' contains a small "Hello World" Demo
3653application; it is automatically compiled when you build U-Boot.
3654It's configured to run at address 0x00040004, so you can play with it
3655like that:
wdenkc6097192002-11-03 00:24:07 +00003656
wdenk2729af92004-05-03 20:45:30 +00003657 => loads
3658 ## Ready for S-Record download ...
3659 ~>examples/hello_world.srec
3660 1 2 3 4 5 6 7 8 9 10 11 ...
3661 [file transfer complete]
3662 [connected]
3663 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003664
wdenk2729af92004-05-03 20:45:30 +00003665 => go 40004 Hello World! This is a test.
3666 ## Starting application at 0x00040004 ...
3667 Hello World
3668 argc = 7
3669 argv[0] = "40004"
3670 argv[1] = "Hello"
3671 argv[2] = "World!"
3672 argv[3] = "This"
3673 argv[4] = "is"
3674 argv[5] = "a"
3675 argv[6] = "test."
3676 argv[7] = "<NULL>"
3677 Hit any key to exit ...
wdenkc6097192002-11-03 00:24:07 +00003678
wdenk2729af92004-05-03 20:45:30 +00003679 ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003680
wdenk2729af92004-05-03 20:45:30 +00003681Another example, which demonstrates how to register a CPM interrupt
3682handler with the U-Boot code, can be found in 'examples/timer.c'.
3683Here, a CPM timer is set up to generate an interrupt every second.
3684The interrupt service routine is trivial, just printing a '.'
3685character, but this is just a demo program. The application can be
3686controlled by the following keys:
wdenkc6097192002-11-03 00:24:07 +00003687
wdenk2729af92004-05-03 20:45:30 +00003688 ? - print current values og the CPM Timer registers
3689 b - enable interrupts and start timer
3690 e - stop timer and disable interrupts
3691 q - quit application
wdenkc6097192002-11-03 00:24:07 +00003692
wdenk2729af92004-05-03 20:45:30 +00003693 => loads
3694 ## Ready for S-Record download ...
3695 ~>examples/timer.srec
3696 1 2 3 4 5 6 7 8 9 10 11 ...
3697 [file transfer complete]
3698 [connected]
3699 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003700
wdenk2729af92004-05-03 20:45:30 +00003701 => go 40004
3702 ## Starting application at 0x00040004 ...
3703 TIMERS=0xfff00980
3704 Using timer 1
3705 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
wdenkc6097192002-11-03 00:24:07 +00003706
wdenk2729af92004-05-03 20:45:30 +00003707Hit 'b':
3708 [q, b, e, ?] Set interval 1000000 us
3709 Enabling timer
3710Hit '?':
3711 [q, b, e, ?] ........
3712 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
3713Hit '?':
3714 [q, b, e, ?] .
3715 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
3716Hit '?':
3717 [q, b, e, ?] .
3718 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
3719Hit '?':
3720 [q, b, e, ?] .
3721 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
3722Hit 'e':
3723 [q, b, e, ?] ...Stopping timer
3724Hit 'q':
3725 [q, b, e, ?] ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003726
3727
wdenk2729af92004-05-03 20:45:30 +00003728Minicom warning:
3729================
wdenk85ec0bc2003-03-31 16:34:49 +00003730
wdenk2729af92004-05-03 20:45:30 +00003731Over time, many people have reported problems when trying to use the
3732"minicom" terminal emulation program for serial download. I (wd)
3733consider minicom to be broken, and recommend not to use it. Under
3734Unix, I recommend to use C-Kermit for general purpose use (and
3735especially for kermit binary protocol download ("loadb" command), and
3736use "cu" for S-Record download ("loads" command).
wdenk85ec0bc2003-03-31 16:34:49 +00003737
wdenk2729af92004-05-03 20:45:30 +00003738Nevertheless, if you absolutely want to use it try adding this
3739configuration to your "File transfer protocols" section:
wdenk52f52c12003-06-19 23:04:19 +00003740
wdenk2729af92004-05-03 20:45:30 +00003741 Name Program Name U/D FullScr IO-Red. Multi
3742 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
3743 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
wdenk52f52c12003-06-19 23:04:19 +00003744
3745
wdenk2729af92004-05-03 20:45:30 +00003746NetBSD Notes:
3747=============
wdenkc6097192002-11-03 00:24:07 +00003748
wdenk2729af92004-05-03 20:45:30 +00003749Starting at version 0.9.2, U-Boot supports NetBSD both as host
3750(build U-Boot) and target system (boots NetBSD/mpc8xx).
wdenkc6097192002-11-03 00:24:07 +00003751
wdenk2729af92004-05-03 20:45:30 +00003752Building requires a cross environment; it is known to work on
3753NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
3754need gmake since the Makefiles are not compatible with BSD make).
3755Note that the cross-powerpc package does not install include files;
3756attempting to build U-Boot will fail because <machine/ansi.h> is
3757missing. This file has to be installed and patched manually:
wdenkc6097192002-11-03 00:24:07 +00003758
wdenk2729af92004-05-03 20:45:30 +00003759 # cd /usr/pkg/cross/powerpc-netbsd/include
3760 # mkdir powerpc
3761 # ln -s powerpc machine
3762 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
3763 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
wdenkc6097192002-11-03 00:24:07 +00003764
wdenk2729af92004-05-03 20:45:30 +00003765Native builds *don't* work due to incompatibilities between native
3766and U-Boot include files.
wdenkc6097192002-11-03 00:24:07 +00003767
wdenk2729af92004-05-03 20:45:30 +00003768Booting assumes that (the first part of) the image booted is a
3769stage-2 loader which in turn loads and then invokes the kernel
3770proper. Loader sources will eventually appear in the NetBSD source
3771tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
wdenk2a8af182005-04-13 10:02:42 +00003772meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
wdenkc6097192002-11-03 00:24:07 +00003773
3774
wdenk2729af92004-05-03 20:45:30 +00003775Implementation Internals:
3776=========================
wdenkc6097192002-11-03 00:24:07 +00003777
wdenk2729af92004-05-03 20:45:30 +00003778The following is not intended to be a complete description of every
3779implementation detail. However, it should help to understand the
3780inner workings of U-Boot and make it easier to port it to custom
3781hardware.
wdenkc6097192002-11-03 00:24:07 +00003782
3783
wdenk2729af92004-05-03 20:45:30 +00003784Initial Stack, Global Data:
3785---------------------------
wdenkc6097192002-11-03 00:24:07 +00003786
wdenk2729af92004-05-03 20:45:30 +00003787The implementation of U-Boot is complicated by the fact that U-Boot
3788starts running out of ROM (flash memory), usually without access to
3789system RAM (because the memory controller is not initialized yet).
3790This means that we don't have writable Data or BSS segments, and BSS
3791is not initialized as zero. To be able to get a C environment working
3792at all, we have to allocate at least a minimal stack. Implementation
3793options for this are defined and restricted by the CPU used: Some CPU
3794models provide on-chip memory (like the IMMR area on MPC8xx and
3795MPC826x processors), on others (parts of) the data cache can be
3796locked as (mis-) used as memory, etc.
wdenkc6097192002-11-03 00:24:07 +00003797
Wolfgang Denk218ca722008-03-26 10:40:12 +01003798 Chris Hallinan posted a good summary of these issues to the
Wolfgang Denk06682362008-12-30 22:56:11 +01003799 U-Boot mailing list:
wdenk43d96162003-03-06 00:02:04 +00003800
wdenk2729af92004-05-03 20:45:30 +00003801 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
3802 From: "Chris Hallinan" <clh@net1plus.com>
3803 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
3804 ...
wdenk43d96162003-03-06 00:02:04 +00003805
wdenk2729af92004-05-03 20:45:30 +00003806 Correct me if I'm wrong, folks, but the way I understand it
3807 is this: Using DCACHE as initial RAM for Stack, etc, does not
3808 require any physical RAM backing up the cache. The cleverness
3809 is that the cache is being used as a temporary supply of
3810 necessary storage before the SDRAM controller is setup. It's
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003811 beyond the scope of this list to explain the details, but you
wdenk2729af92004-05-03 20:45:30 +00003812 can see how this works by studying the cache architecture and
3813 operation in the architecture and processor-specific manuals.
wdenk43d96162003-03-06 00:02:04 +00003814
wdenk2729af92004-05-03 20:45:30 +00003815 OCM is On Chip Memory, which I believe the 405GP has 4K. It
3816 is another option for the system designer to use as an
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003817 initial stack/RAM area prior to SDRAM being available. Either
wdenk2729af92004-05-03 20:45:30 +00003818 option should work for you. Using CS 4 should be fine if your
3819 board designers haven't used it for something that would
3820 cause you grief during the initial boot! It is frequently not
3821 used.
wdenk43d96162003-03-06 00:02:04 +00003822
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003823 CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
wdenk2729af92004-05-03 20:45:30 +00003824 with your processor/board/system design. The default value
3825 you will find in any recent u-boot distribution in
Stefan Roese8a316c92005-08-01 16:49:12 +02003826 walnut.h should work for you. I'd set it to a value larger
wdenk2729af92004-05-03 20:45:30 +00003827 than your SDRAM module. If you have a 64MB SDRAM module, set
3828 it above 400_0000. Just make sure your board has no resources
3829 that are supposed to respond to that address! That code in
3830 start.S has been around a while and should work as is when
3831 you get the config right.
wdenk43d96162003-03-06 00:02:04 +00003832
wdenk2729af92004-05-03 20:45:30 +00003833 -Chris Hallinan
3834 DS4.COM, Inc.
wdenk43d96162003-03-06 00:02:04 +00003835
wdenk2729af92004-05-03 20:45:30 +00003836It is essential to remember this, since it has some impact on the C
3837code for the initialization procedures:
wdenkc6097192002-11-03 00:24:07 +00003838
wdenk2729af92004-05-03 20:45:30 +00003839* Initialized global data (data segment) is read-only. Do not attempt
3840 to write it.
wdenkc6097192002-11-03 00:24:07 +00003841
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003842* Do not use any uninitialized global data (or implicitely initialized
wdenk2729af92004-05-03 20:45:30 +00003843 as zero data - BSS segment) at all - this is undefined, initiali-
3844 zation is performed later (when relocating to RAM).
wdenkc6097192002-11-03 00:24:07 +00003845
wdenk2729af92004-05-03 20:45:30 +00003846* Stack space is very limited. Avoid big data buffers or things like
3847 that.
wdenkc6097192002-11-03 00:24:07 +00003848
wdenk2729af92004-05-03 20:45:30 +00003849Having only the stack as writable memory limits means we cannot use
3850normal global data to share information beween the code. But it
3851turned out that the implementation of U-Boot can be greatly
3852simplified by making a global data structure (gd_t) available to all
3853functions. We could pass a pointer to this data as argument to _all_
3854functions, but this would bloat the code. Instead we use a feature of
3855the GCC compiler (Global Register Variables) to share the data: we
3856place a pointer (gd) to the global data into a register which we
3857reserve for this purpose.
wdenkc6097192002-11-03 00:24:07 +00003858
wdenk2729af92004-05-03 20:45:30 +00003859When choosing a register for such a purpose we are restricted by the
3860relevant (E)ABI specifications for the current architecture, and by
3861GCC's implementation.
wdenkc6097192002-11-03 00:24:07 +00003862
wdenk2729af92004-05-03 20:45:30 +00003863For PowerPC, the following registers have specific use:
3864 R1: stack pointer
Wolfgang Denke7670f62008-02-14 22:43:22 +01003865 R2: reserved for system use
wdenk2729af92004-05-03 20:45:30 +00003866 R3-R4: parameter passing and return values
3867 R5-R10: parameter passing
3868 R13: small data area pointer
3869 R30: GOT pointer
3870 R31: frame pointer
wdenkc6097192002-11-03 00:24:07 +00003871
wdenk2729af92004-05-03 20:45:30 +00003872 (U-Boot also uses R14 as internal GOT pointer.)
wdenkc6097192002-11-03 00:24:07 +00003873
Wolfgang Denke7670f62008-02-14 22:43:22 +01003874 ==> U-Boot will use R2 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003875
wdenk2729af92004-05-03 20:45:30 +00003876 Note: on PPC, we could use a static initializer (since the
3877 address of the global data structure is known at compile time),
3878 but it turned out that reserving a register results in somewhat
3879 smaller code - although the code savings are not that big (on
3880 average for all boards 752 bytes for the whole U-Boot image,
3881 624 text + 127 data).
wdenkc6097192002-11-03 00:24:07 +00003882
Mike Frysinger4c58eb52008-02-04 19:26:54 -05003883On Blackfin, the normal C ABI (except for P5) is followed as documented here:
3884 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
3885
3886 ==> U-Boot will use P5 to hold a pointer to the global data
3887
wdenk2729af92004-05-03 20:45:30 +00003888On ARM, the following registers are used:
wdenkc6097192002-11-03 00:24:07 +00003889
wdenk2729af92004-05-03 20:45:30 +00003890 R0: function argument word/integer result
3891 R1-R3: function argument word
3892 R9: GOT pointer
3893 R10: stack limit (used only if stack checking if enabled)
3894 R11: argument (frame) pointer
3895 R12: temporary workspace
3896 R13: stack pointer
3897 R14: link register
3898 R15: program counter
wdenkc6097192002-11-03 00:24:07 +00003899
wdenk2729af92004-05-03 20:45:30 +00003900 ==> U-Boot will use R8 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003901
Wolfgang Denkd87080b2006-03-31 18:32:53 +02003902NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
3903or current versions of GCC may "optimize" the code too much.
wdenkc6097192002-11-03 00:24:07 +00003904
wdenk2729af92004-05-03 20:45:30 +00003905Memory Management:
3906------------------
wdenkc6097192002-11-03 00:24:07 +00003907
wdenk2729af92004-05-03 20:45:30 +00003908U-Boot runs in system state and uses physical addresses, i.e. the
3909MMU is not used either for address mapping nor for memory protection.
wdenkc6097192002-11-03 00:24:07 +00003910
wdenk2729af92004-05-03 20:45:30 +00003911The available memory is mapped to fixed addresses using the memory
3912controller. In this process, a contiguous block is formed for each
3913memory type (Flash, SDRAM, SRAM), even when it consists of several
3914physical memory banks.
wdenkc6097192002-11-03 00:24:07 +00003915
wdenk2729af92004-05-03 20:45:30 +00003916U-Boot is installed in the first 128 kB of the first Flash bank (on
3917TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
3918booting and sizing and initializing DRAM, the code relocates itself
3919to the upper end of DRAM. Immediately below the U-Boot code some
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003920memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
wdenk2729af92004-05-03 20:45:30 +00003921configuration setting]. Below that, a structure with global Board
3922Info data is placed, followed by the stack (growing downward).
wdenkc6097192002-11-03 00:24:07 +00003923
wdenk2729af92004-05-03 20:45:30 +00003924Additionally, some exception handler code is copied to the low 8 kB
3925of DRAM (0x00000000 ... 0x00001FFF).
wdenkc6097192002-11-03 00:24:07 +00003926
wdenk2729af92004-05-03 20:45:30 +00003927So a typical memory configuration with 16 MB of DRAM could look like
3928this:
wdenkc6097192002-11-03 00:24:07 +00003929
wdenk2729af92004-05-03 20:45:30 +00003930 0x0000 0000 Exception Vector code
3931 :
3932 0x0000 1FFF
3933 0x0000 2000 Free for Application Use
3934 :
3935 :
wdenkc6097192002-11-03 00:24:07 +00003936
wdenk2729af92004-05-03 20:45:30 +00003937 :
3938 :
3939 0x00FB FF20 Monitor Stack (Growing downward)
3940 0x00FB FFAC Board Info Data and permanent copy of global data
3941 0x00FC 0000 Malloc Arena
3942 :
3943 0x00FD FFFF
3944 0x00FE 0000 RAM Copy of Monitor Code
3945 ... eventually: LCD or video framebuffer
3946 ... eventually: pRAM (Protected RAM - unchanged by reset)
3947 0x00FF FFFF [End of RAM]
wdenkc6097192002-11-03 00:24:07 +00003948
3949
wdenk2729af92004-05-03 20:45:30 +00003950System Initialization:
3951----------------------
wdenkc6097192002-11-03 00:24:07 +00003952
wdenk2729af92004-05-03 20:45:30 +00003953In the reset configuration, U-Boot starts at the reset entry point
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003954(on most PowerPC systems at address 0x00000100). Because of the reset
wdenk2729af92004-05-03 20:45:30 +00003955configuration for CS0# this is a mirror of the onboard Flash memory.
3956To be able to re-map memory U-Boot then jumps to its link address.
3957To be able to implement the initialization code in C, a (small!)
3958initial stack is set up in the internal Dual Ported RAM (in case CPUs
3959which provide such a feature like MPC8xx or MPC8260), or in a locked
3960part of the data cache. After that, U-Boot initializes the CPU core,
3961the caches and the SIU.
wdenkc6097192002-11-03 00:24:07 +00003962
wdenk2729af92004-05-03 20:45:30 +00003963Next, all (potentially) available memory banks are mapped using a
3964preliminary mapping. For example, we put them on 512 MB boundaries
3965(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
3966on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
3967programmed for SDRAM access. Using the temporary configuration, a
3968simple memory test is run that determines the size of the SDRAM
3969banks.
wdenkc6097192002-11-03 00:24:07 +00003970
wdenk2729af92004-05-03 20:45:30 +00003971When there is more than one SDRAM bank, and the banks are of
3972different size, the largest is mapped first. For equal size, the first
3973bank (CS2#) is mapped first. The first mapping is always for address
39740x00000000, with any additional banks following immediately to create
3975contiguous memory starting from 0.
wdenkc6097192002-11-03 00:24:07 +00003976
wdenk2729af92004-05-03 20:45:30 +00003977Then, the monitor installs itself at the upper end of the SDRAM area
3978and allocates memory for use by malloc() and for the global Board
3979Info data; also, the exception vector code is copied to the low RAM
3980pages, and the final stack is set up.
wdenkc6097192002-11-03 00:24:07 +00003981
wdenk2729af92004-05-03 20:45:30 +00003982Only after this relocation will you have a "normal" C environment;
3983until that you are restricted in several ways, mostly because you are
3984running from ROM, and because the code will have to be relocated to a
3985new address in RAM.
wdenkc6097192002-11-03 00:24:07 +00003986
3987
wdenk2729af92004-05-03 20:45:30 +00003988U-Boot Porting Guide:
3989----------------------
wdenkc6097192002-11-03 00:24:07 +00003990
wdenk2729af92004-05-03 20:45:30 +00003991[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
3992list, October 2002]
wdenkc6097192002-11-03 00:24:07 +00003993
3994
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04003995int main(int argc, char *argv[])
wdenk2729af92004-05-03 20:45:30 +00003996{
3997 sighandler_t no_more_time;
wdenkc6097192002-11-03 00:24:07 +00003998
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04003999 signal(SIGALRM, no_more_time);
4000 alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
wdenkc6097192002-11-03 00:24:07 +00004001
wdenk2729af92004-05-03 20:45:30 +00004002 if (available_money > available_manpower) {
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04004003 Pay consultant to port U-Boot;
wdenkc6097192002-11-03 00:24:07 +00004004 return 0;
4005 }
4006
wdenk2729af92004-05-03 20:45:30 +00004007 Download latest U-Boot source;
4008
Wolfgang Denk06682362008-12-30 22:56:11 +01004009 Subscribe to u-boot mailing list;
wdenk2729af92004-05-03 20:45:30 +00004010
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04004011 if (clueless)
4012 email("Hi, I am new to U-Boot, how do I get started?");
wdenkc6097192002-11-03 00:24:07 +00004013
wdenk2729af92004-05-03 20:45:30 +00004014 while (learning) {
4015 Read the README file in the top level directory;
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04004016 Read http://www.denx.de/twiki/bin/view/DULG/Manual;
4017 Read applicable doc/*.README;
wdenk2729af92004-05-03 20:45:30 +00004018 Read the source, Luke;
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04004019 /* find . -name "*.[chS]" | xargs grep -i <keyword> */
wdenk2729af92004-05-03 20:45:30 +00004020 }
wdenkc6097192002-11-03 00:24:07 +00004021
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04004022 if (available_money > toLocalCurrency ($2500))
4023 Buy a BDI3000;
4024 else
wdenk2729af92004-05-03 20:45:30 +00004025 Add a lot of aggravation and time;
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04004026
4027 if (a similar board exists) { /* hopefully... */
4028 cp -a board/<similar> board/<myboard>
4029 cp include/configs/<similar>.h include/configs/<myboard>.h
4030 } else {
4031 Create your own board support subdirectory;
4032 Create your own board include/configs/<myboard>.h file;
wdenk2729af92004-05-03 20:45:30 +00004033 }
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04004034 Edit new board/<myboard> files
4035 Edit new include/configs/<myboard>.h
wdenkc6097192002-11-03 00:24:07 +00004036
Jerry Van Baren6c3fef22009-07-15 20:42:59 -04004037 while (!accepted) {
4038 while (!running) {
4039 do {
4040 Add / modify source code;
4041 } until (compiles);
4042 Debug;
4043 if (clueless)
4044 email("Hi, I am having problems...");
4045 }
4046 Send patch file to the U-Boot email list;
4047 if (reasonable critiques)
4048 Incorporate improvements from email list code review;
4049 else
4050 Defend code as written;
wdenk2729af92004-05-03 20:45:30 +00004051 }
wdenkc6097192002-11-03 00:24:07 +00004052
wdenk2729af92004-05-03 20:45:30 +00004053 return 0;
4054}
4055
4056void no_more_time (int sig)
4057{
4058 hire_a_guru();
4059}
wdenkc6097192002-11-03 00:24:07 +00004060
4061
wdenk2729af92004-05-03 20:45:30 +00004062Coding Standards:
4063-----------------
wdenkc6097192002-11-03 00:24:07 +00004064
wdenk2729af92004-05-03 20:45:30 +00004065All contributions to U-Boot should conform to the Linux kernel
Detlev Zundel2c051652006-09-01 15:39:02 +02004066coding style; see the file "Documentation/CodingStyle" and the script
4067"scripts/Lindent" in your Linux kernel source directory. In sources
4068originating from U-Boot a style corresponding to "Lindent -pcs" (adding
4069spaces before parameters to function calls) is actually used.
wdenk2729af92004-05-03 20:45:30 +00004070
Detlev Zundel2c051652006-09-01 15:39:02 +02004071Source files originating from a different project (for example the
4072MTD subsystem) are generally exempt from these guidelines and are not
4073reformated to ease subsequent migration to newer versions of those
4074sources.
4075
4076Please note that U-Boot is implemented in C (and to some small parts in
4077Assembler); no C++ is used, so please do not use C++ style comments (//)
4078in your code.
wdenk2729af92004-05-03 20:45:30 +00004079
4080Please also stick to the following formatting rules:
4081- remove any trailing white space
4082- use TAB characters for indentation, not spaces
4083- make sure NOT to use DOS '\r\n' line feeds
4084- do not add more than 2 empty lines to source files
4085- do not add trailing empty lines to source files
4086
4087Submissions which do not conform to the standards may be returned
4088with a request to reformat the changes.
wdenkc6097192002-11-03 00:24:07 +00004089
4090
wdenk2729af92004-05-03 20:45:30 +00004091Submitting Patches:
4092-------------------
wdenkc6097192002-11-03 00:24:07 +00004093
wdenk2729af92004-05-03 20:45:30 +00004094Since the number of patches for U-Boot is growing, we need to
4095establish some rules. Submissions which do not conform to these rules
4096may be rejected, even when they contain important and valuable stuff.
wdenkc6097192002-11-03 00:24:07 +00004097
Magnus Lilja0d28f342008-08-06 19:32:33 +02004098Please see http://www.denx.de/wiki/U-Boot/Patches for details.
Wolfgang Denk218ca722008-03-26 10:40:12 +01004099
Wolfgang Denk06682362008-12-30 22:56:11 +01004100Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
4101see http://lists.denx.de/mailman/listinfo/u-boot
4102
wdenk2729af92004-05-03 20:45:30 +00004103When you send a patch, please include the following information with
4104it:
wdenkc6097192002-11-03 00:24:07 +00004105
wdenk2729af92004-05-03 20:45:30 +00004106* For bug fixes: a description of the bug and how your patch fixes
4107 this bug. Please try to include a way of demonstrating that the
4108 patch actually fixes something.
wdenkc6097192002-11-03 00:24:07 +00004109
wdenk2729af92004-05-03 20:45:30 +00004110* For new features: a description of the feature and your
4111 implementation.
wdenkc6097192002-11-03 00:24:07 +00004112
wdenk2729af92004-05-03 20:45:30 +00004113* A CHANGELOG entry as plaintext (separate from the patch)
4114
4115* For major contributions, your entry to the CREDITS file
4116
4117* When you add support for a new board, don't forget to add this
4118 board to the MAKEALL script, too.
4119
4120* If your patch adds new configuration options, don't forget to
4121 document these in the README file.
4122
Wolfgang Denk218ca722008-03-26 10:40:12 +01004123* The patch itself. If you are using git (which is *strongly*
4124 recommended) you can easily generate the patch using the
4125 "git-format-patch". If you then use "git-send-email" to send it to
4126 the U-Boot mailing list, you will avoid most of the common problems
4127 with some other mail clients.
wdenk2729af92004-05-03 20:45:30 +00004128
Wolfgang Denk218ca722008-03-26 10:40:12 +01004129 If you cannot use git, use "diff -purN OLD NEW". If your version of
4130 diff does not support these options, then get the latest version of
4131 GNU diff.
wdenk2729af92004-05-03 20:45:30 +00004132
Wolfgang Denk218ca722008-03-26 10:40:12 +01004133 The current directory when running this command shall be the parent
4134 directory of the U-Boot source tree (i. e. please make sure that
4135 your patch includes sufficient directory information for the
4136 affected files).
4137
4138 We prefer patches as plain text. MIME attachments are discouraged,
4139 and compressed attachments must not be used.
wdenk2729af92004-05-03 20:45:30 +00004140
4141* If one logical set of modifications affects or creates several
4142 files, all these changes shall be submitted in a SINGLE patch file.
4143
4144* Changesets that contain different, unrelated modifications shall be
4145 submitted as SEPARATE patches, one patch per changeset.
4146
4147
4148Notes:
4149
4150* Before sending the patch, run the MAKEALL script on your patched
4151 source tree and make sure that no errors or warnings are reported
4152 for any of the boards.
4153
4154* Keep your modifications to the necessary minimum: A patch
4155 containing several unrelated changes or arbitrary reformats will be
4156 returned with a request to re-formatting / split it.
4157
4158* If you modify existing code, make sure that your new code does not
4159 add to the memory footprint of the code ;-) Small is beautiful!
4160 When adding new features, these should compile conditionally only
4161 (using #ifdef), and the resulting code with the new feature
4162 disabled must not need more memory than the old code without your
4163 modification.
wdenk90dc6702005-05-03 14:12:25 +00004164
Wolfgang Denk06682362008-12-30 22:56:11 +01004165* Remember that there is a size limit of 100 kB per message on the
4166 u-boot mailing list. Bigger patches will be moderated. If they are
4167 reasonable and not too big, they will be acknowledged. But patches
4168 bigger than the size limit should be avoided.