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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_I2C_CMD_TREE is a recommended option that places
1319 all I2C commands under a single 'i2c' root command. The
1320 older 'imm', 'imd', 'iprobe' etc. commands are considered
1321 deprecated and may disappear in the future.
1322
1323 CONFIG_HARD_I2C selects a hardware I2C controller.
wdenkc6097192002-11-03 00:24:07 +00001324
wdenk945af8d2003-07-16 21:53:01 +00001325 CONFIG_SOFT_I2C configures u-boot to use a software (aka
wdenkb37c7e52003-06-30 16:24:52 +00001326 bit-banging) driver instead of CPM or similar hardware
1327 support for I2C.
wdenkc6097192002-11-03 00:24:07 +00001328
wdenk945af8d2003-07-16 21:53:01 +00001329 There are several other quantities that must also be
wdenkb37c7e52003-06-30 16:24:52 +00001330 defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
wdenkc6097192002-11-03 00:24:07 +00001331
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001332 In both cases you will need to define CONFIG_SYS_I2C_SPEED
wdenk945af8d2003-07-16 21:53:01 +00001333 to be the frequency (in Hz) at which you wish your i2c bus
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001334 to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001335 the CPU's i2c node address).
wdenk945af8d2003-07-16 21:53:01 +00001336
wdenkb37c7e52003-06-30 16:24:52 +00001337 Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001338 sets the CPU up as a master node and so its address should
wdenkb37c7e52003-06-30 16:24:52 +00001339 therefore be cleared to 0 (See, eg, MPC823e User's Manual
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001340 p.16-473). So, set CONFIG_SYS_I2C_SLAVE to 0.
wdenkc6097192002-11-03 00:24:07 +00001341
wdenk945af8d2003-07-16 21:53:01 +00001342 That's all that's required for CONFIG_HARD_I2C.
wdenkb37c7e52003-06-30 16:24:52 +00001343
1344 If you use the software i2c interface (CONFIG_SOFT_I2C)
1345 then the following macros need to be defined (examples are
1346 from include/configs/lwmon.h):
wdenkc6097192002-11-03 00:24:07 +00001347
1348 I2C_INIT
1349
wdenkb37c7e52003-06-30 16:24:52 +00001350 (Optional). Any commands necessary to enable the I2C
wdenk43d96162003-03-06 00:02:04 +00001351 controller or configure ports.
wdenkc6097192002-11-03 00:24:07 +00001352
wdenkba56f622004-02-06 23:19:44 +00001353 eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL)
wdenkb37c7e52003-06-30 16:24:52 +00001354
wdenkc6097192002-11-03 00:24:07 +00001355 I2C_PORT
1356
wdenk43d96162003-03-06 00:02:04 +00001357 (Only for MPC8260 CPU). The I/O port to use (the code
1358 assumes both bits are on the same port). Valid values
1359 are 0..3 for ports A..D.
wdenkc6097192002-11-03 00:24:07 +00001360
1361 I2C_ACTIVE
1362
1363 The code necessary to make the I2C data line active
1364 (driven). If the data line is open collector, this
1365 define can be null.
1366
wdenkb37c7e52003-06-30 16:24:52 +00001367 eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA)
1368
wdenkc6097192002-11-03 00:24:07 +00001369 I2C_TRISTATE
1370
1371 The code necessary to make the I2C data line tri-stated
1372 (inactive). If the data line is open collector, this
1373 define can be null.
1374
wdenkb37c7e52003-06-30 16:24:52 +00001375 eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1376
wdenkc6097192002-11-03 00:24:07 +00001377 I2C_READ
1378
1379 Code that returns TRUE if the I2C data line is high,
1380 FALSE if it is low.
1381
wdenkb37c7e52003-06-30 16:24:52 +00001382 eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1383
wdenkc6097192002-11-03 00:24:07 +00001384 I2C_SDA(bit)
1385
1386 If <bit> is TRUE, sets the I2C data line high. If it
1387 is FALSE, it clears it (low).
1388
wdenkb37c7e52003-06-30 16:24:52 +00001389 eg: #define I2C_SDA(bit) \
wdenk2535d602003-07-17 23:16:40 +00001390 if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \
wdenkba56f622004-02-06 23:19:44 +00001391 else immr->im_cpm.cp_pbdat &= ~PB_SDA
wdenkb37c7e52003-06-30 16:24:52 +00001392
wdenkc6097192002-11-03 00:24:07 +00001393 I2C_SCL(bit)
1394
1395 If <bit> is TRUE, sets the I2C clock line high. If it
1396 is FALSE, it clears it (low).
1397
wdenkb37c7e52003-06-30 16:24:52 +00001398 eg: #define I2C_SCL(bit) \
wdenk2535d602003-07-17 23:16:40 +00001399 if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \
wdenkba56f622004-02-06 23:19:44 +00001400 else immr->im_cpm.cp_pbdat &= ~PB_SCL
wdenkb37c7e52003-06-30 16:24:52 +00001401
wdenkc6097192002-11-03 00:24:07 +00001402 I2C_DELAY
1403
1404 This delay is invoked four times per clock cycle so this
1405 controls the rate of data transfer. The data rate thus
wdenkb37c7e52003-06-30 16:24:52 +00001406 is 1 / (I2C_DELAY * 4). Often defined to be something
wdenk945af8d2003-07-16 21:53:01 +00001407 like:
1408
wdenkb37c7e52003-06-30 16:24:52 +00001409 #define I2C_DELAY udelay(2)
wdenkc6097192002-11-03 00:24:07 +00001410
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001411 CONFIG_SYS_I2C_INIT_BOARD
wdenk47cd00f2003-03-06 13:39:27 +00001412
wdenk8bde7f72003-06-27 21:31:46 +00001413 When a board is reset during an i2c bus transfer
1414 chips might think that the current transfer is still
1415 in progress. On some boards it is possible to access
1416 the i2c SCLK line directly, either by using the
1417 processor pin as a GPIO or by having a second pin
1418 connected to the bus. If this option is defined a
1419 custom i2c_init_board() routine in boards/xxx/board.c
1420 is run early in the boot sequence.
wdenk47cd00f2003-03-06 13:39:27 +00001421
wdenk17ea1172004-06-06 21:51:03 +00001422 CONFIG_I2CFAST (PPC405GP|PPC405EP only)
1423
1424 This option enables configuration of bi_iic_fast[] flags
1425 in u-boot bd_info structure based on u-boot environment
1426 variable "i2cfast". (see also i2cfast)
1427
Ben Warrenbb99ad62006-09-07 16:50:54 -04001428 CONFIG_I2C_MULTI_BUS
1429
1430 This option allows the use of multiple I2C buses, each of which
1431 must have a controller. At any point in time, only one bus is
1432 active. To switch to a different bus, use the 'i2c dev' command.
1433 Note that bus numbering is zero-based.
1434
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001435 CONFIG_SYS_I2C_NOPROBES
Ben Warrenbb99ad62006-09-07 16:50:54 -04001436
1437 This option specifies a list of I2C devices that will be skipped
1438 when the 'i2c probe' command is issued (or 'iprobe' using the legacy
1439 command). If CONFIG_I2C_MULTI_BUS is set, specify a list of bus-device
Wolfgang Denk218ca722008-03-26 10:40:12 +01001440 pairs. Otherwise, specify a 1D array of device addresses
Ben Warrenbb99ad62006-09-07 16:50:54 -04001441
1442 e.g.
1443 #undef CONFIG_I2C_MULTI_BUS
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001444 #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
Ben Warrenbb99ad62006-09-07 16:50:54 -04001445
1446 will skip addresses 0x50 and 0x68 on a board with one I2C bus
1447
1448 #define CONFIG_I2C_MULTI_BUS
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001449 #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}}
Ben Warrenbb99ad62006-09-07 16:50:54 -04001450
1451 will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1452
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001453 CONFIG_SYS_SPD_BUS_NUM
Timur Tabibe5e6182006-11-03 19:15:00 -06001454
1455 If defined, then this indicates the I2C bus number for DDR SPD.
1456 If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1457
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001458 CONFIG_SYS_RTC_BUS_NUM
Stefan Roese0dc018e2007-02-20 10:51:26 +01001459
1460 If defined, then this indicates the I2C bus number for the RTC.
1461 If not defined, then U-Boot assumes that RTC is on I2C bus 0.
1462
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001463 CONFIG_SYS_DTT_BUS_NUM
Stefan Roese0dc018e2007-02-20 10:51:26 +01001464
1465 If defined, then this indicates the I2C bus number for the DTT.
1466 If not defined, then U-Boot assumes that DTT is on I2C bus 0.
1467
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001468 CONFIG_SYS_I2C_DTT_ADDR:
Victor Gallardo9ebbb542008-09-09 15:13:29 -07001469
1470 If defined, specifies the I2C address of the DTT device.
1471 If not defined, then U-Boot uses predefined value for
1472 specified DTT device.
1473
Timur Tabibe5e6182006-11-03 19:15:00 -06001474 CONFIG_FSL_I2C
1475
1476 Define this option if you want to use Freescale's I2C driver in
Marcel Ziswiler7817cb22007-12-30 03:30:46 +01001477 drivers/i2c/fsl_i2c.c.
Timur Tabibe5e6182006-11-03 19:15:00 -06001478
Heiko Schocher67b23a32008-10-15 09:39:47 +02001479 CONFIG_I2C_MUX
1480
1481 Define this option if you have I2C devices reached over 1 .. n
1482 I2C Muxes like the pca9544a. This option addes a new I2C
1483 Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
1484 new I2C Bus to the existing I2C Busses. If you select the
1485 new Bus with "i2c dev", u-bbot sends first the commandos for
1486 the muxes to activate this new "bus".
1487
1488 CONFIG_I2C_MULTI_BUS must be also defined, to use this
1489 feature!
1490
1491 Example:
1492 Adding a new I2C Bus reached over 2 pca9544a muxes
1493 The First mux with address 70 and channel 6
1494 The Second mux with address 71 and channel 4
1495
1496 => i2c bus pca9544a:70:6:pca9544a:71:4
1497
1498 Use the "i2c bus" command without parameter, to get a list
1499 of I2C Busses with muxes:
1500
1501 => i2c bus
1502 Busses reached over muxes:
1503 Bus ID: 2
1504 reached over Mux(es):
1505 pca9544a@70 ch: 4
1506 Bus ID: 3
1507 reached over Mux(es):
1508 pca9544a@70 ch: 6
1509 pca9544a@71 ch: 4
1510 =>
1511
1512 If you now switch to the new I2C Bus 3 with "i2c dev 3"
1513 u-boot sends First the Commando to the mux@70 to enable
1514 channel 6, and then the Commando to the mux@71 to enable
1515 the channel 4.
1516
1517 After that, you can use the "normal" i2c commands as
1518 usual, to communicate with your I2C devices behind
1519 the 2 muxes.
1520
1521 This option is actually implemented for the bitbanging
1522 algorithm in common/soft_i2c.c and for the Hardware I2C
1523 Bus on the MPC8260. But it should be not so difficult
1524 to add this option to other architectures.
1525
Andrew Dyer2ac69852008-12-29 17:36:01 -06001526 CONFIG_SOFT_I2C_READ_REPEATED_START
1527
1528 defining this will force the i2c_read() function in
1529 the soft_i2c driver to perform an I2C repeated start
1530 between writing the address pointer and reading the
1531 data. If this define is omitted the default behaviour
1532 of doing a stop-start sequence will be used. Most I2C
1533 devices can use either method, but some require one or
1534 the other.
Timur Tabibe5e6182006-11-03 19:15:00 -06001535
wdenkc6097192002-11-03 00:24:07 +00001536- SPI Support: CONFIG_SPI
1537
1538 Enables SPI driver (so far only tested with
1539 SPI EEPROM, also an instance works with Crystal A/D and
1540 D/As on the SACSng board)
1541
1542 CONFIG_SPI_X
1543
1544 Enables extended (16-bit) SPI EEPROM addressing.
1545 (symmetrical to CONFIG_I2C_X)
1546
1547 CONFIG_SOFT_SPI
1548
wdenk43d96162003-03-06 00:02:04 +00001549 Enables a software (bit-bang) SPI driver rather than
1550 using hardware support. This is a general purpose
1551 driver that only requires three general I/O port pins
1552 (two outputs, one input) to function. If this is
1553 defined, the board configuration must define several
1554 SPI configuration items (port pins to use, etc). For
1555 an example, see include/configs/sacsng.h.
wdenkc6097192002-11-03 00:24:07 +00001556
Ben Warren04a9e112008-01-16 22:37:35 -05001557 CONFIG_HARD_SPI
1558
1559 Enables a hardware SPI driver for general-purpose reads
1560 and writes. As with CONFIG_SOFT_SPI, the board configuration
1561 must define a list of chip-select function pointers.
1562 Currently supported on some MPC8xxx processors. For an
1563 example, see include/configs/mpc8349emds.h.
1564
Guennadi Liakhovetski38254f42008-04-15 14:14:25 +02001565 CONFIG_MXC_SPI
1566
1567 Enables the driver for the SPI controllers on i.MX and MXC
1568 SoCs. Currently only i.MX31 is supported.
1569
Matthias Fuchs01335022007-12-27 17:12:34 +01001570- FPGA Support: CONFIG_FPGA
1571
1572 Enables FPGA subsystem.
1573
1574 CONFIG_FPGA_<vendor>
1575
1576 Enables support for specific chip vendors.
1577 (ALTERA, XILINX)
1578
1579 CONFIG_FPGA_<family>
1580
1581 Enables support for FPGA family.
1582 (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
1583
1584 CONFIG_FPGA_COUNT
wdenkc6097192002-11-03 00:24:07 +00001585
wdenk43d96162003-03-06 00:02:04 +00001586 Specify the number of FPGA devices to support.
wdenkc6097192002-11-03 00:24:07 +00001587
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001588 CONFIG_SYS_FPGA_PROG_FEEDBACK
wdenkc6097192002-11-03 00:24:07 +00001589
wdenk8bde7f72003-06-27 21:31:46 +00001590 Enable printing of hash marks during FPGA configuration.
wdenkc6097192002-11-03 00:24:07 +00001591
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001592 CONFIG_SYS_FPGA_CHECK_BUSY
wdenkc6097192002-11-03 00:24:07 +00001593
wdenk43d96162003-03-06 00:02:04 +00001594 Enable checks on FPGA configuration interface busy
1595 status by the configuration function. This option
1596 will require a board or device specific function to
1597 be written.
wdenkc6097192002-11-03 00:24:07 +00001598
1599 CONFIG_FPGA_DELAY
1600
1601 If defined, a function that provides delays in the FPGA
1602 configuration driver.
1603
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001604 CONFIG_SYS_FPGA_CHECK_CTRLC
wdenkc6097192002-11-03 00:24:07 +00001605 Allow Control-C to interrupt FPGA configuration
1606
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001607 CONFIG_SYS_FPGA_CHECK_ERROR
wdenkc6097192002-11-03 00:24:07 +00001608
wdenk43d96162003-03-06 00:02:04 +00001609 Check for configuration errors during FPGA bitfile
1610 loading. For example, abort during Virtex II
1611 configuration if the INIT_B line goes low (which
1612 indicated a CRC error).
wdenkc6097192002-11-03 00:24:07 +00001613
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001614 CONFIG_SYS_FPGA_WAIT_INIT
wdenkc6097192002-11-03 00:24:07 +00001615
wdenk43d96162003-03-06 00:02:04 +00001616 Maximum time to wait for the INIT_B line to deassert
1617 after PROB_B has been deasserted during a Virtex II
1618 FPGA configuration sequence. The default time is 500
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001619 ms.
wdenkc6097192002-11-03 00:24:07 +00001620
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001621 CONFIG_SYS_FPGA_WAIT_BUSY
wdenkc6097192002-11-03 00:24:07 +00001622
wdenk43d96162003-03-06 00:02:04 +00001623 Maximum time to wait for BUSY to deassert during
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001624 Virtex II FPGA configuration. The default is 5 ms.
wdenkc6097192002-11-03 00:24:07 +00001625
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001626 CONFIG_SYS_FPGA_WAIT_CONFIG
wdenkc6097192002-11-03 00:24:07 +00001627
wdenk43d96162003-03-06 00:02:04 +00001628 Time to wait after FPGA configuration. The default is
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001629 200 ms.
wdenkc6097192002-11-03 00:24:07 +00001630
1631- Configuration Management:
1632 CONFIG_IDENT_STRING
1633
wdenk43d96162003-03-06 00:02:04 +00001634 If defined, this string will be added to the U-Boot
1635 version information (U_BOOT_VERSION)
wdenkc6097192002-11-03 00:24:07 +00001636
1637- Vendor Parameter Protection:
1638
wdenk43d96162003-03-06 00:02:04 +00001639 U-Boot considers the values of the environment
1640 variables "serial#" (Board Serial Number) and
wdenk7152b1d2003-09-05 23:19:14 +00001641 "ethaddr" (Ethernet Address) to be parameters that
wdenk43d96162003-03-06 00:02:04 +00001642 are set once by the board vendor / manufacturer, and
1643 protects these variables from casual modification by
1644 the user. Once set, these variables are read-only,
1645 and write or delete attempts are rejected. You can
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001646 change this behaviour:
wdenkc6097192002-11-03 00:24:07 +00001647
1648 If CONFIG_ENV_OVERWRITE is #defined in your config
1649 file, the write protection for vendor parameters is
wdenk47cd00f2003-03-06 13:39:27 +00001650 completely disabled. Anybody can change or delete
wdenkc6097192002-11-03 00:24:07 +00001651 these parameters.
1652
1653 Alternatively, if you #define _both_ CONFIG_ETHADDR
1654 _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001655 Ethernet address is installed in the environment,
wdenkc6097192002-11-03 00:24:07 +00001656 which can be changed exactly ONCE by the user. [The
1657 serial# is unaffected by this, i. e. it remains
1658 read-only.]
1659
1660- Protected RAM:
1661 CONFIG_PRAM
1662
1663 Define this variable to enable the reservation of
1664 "protected RAM", i. e. RAM which is not overwritten
1665 by U-Boot. Define CONFIG_PRAM to hold the number of
1666 kB you want to reserve for pRAM. You can overwrite
1667 this default value by defining an environment
1668 variable "pram" to the number of kB you want to
1669 reserve. Note that the board info structure will
1670 still show the full amount of RAM. If pRAM is
1671 reserved, a new environment variable "mem" will
1672 automatically be defined to hold the amount of
1673 remaining RAM in a form that can be passed as boot
1674 argument to Linux, for instance like that:
1675
Wolfgang Denkfe126d82005-11-20 21:40:11 +01001676 setenv bootargs ... mem=\${mem}
wdenkc6097192002-11-03 00:24:07 +00001677 saveenv
1678
1679 This way you can tell Linux not to use this memory,
1680 either, which results in a memory region that will
1681 not be affected by reboots.
1682
1683 *WARNING* If your board configuration uses automatic
1684 detection of the RAM size, you must make sure that
1685 this memory test is non-destructive. So far, the
1686 following board configurations are known to be
1687 "pRAM-clean":
1688
1689 ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1690 HERMES, IP860, RPXlite, LWMON, LANTEC,
1691 PCU_E, FLAGADM, TQM8260
1692
1693- Error Recovery:
1694 CONFIG_PANIC_HANG
1695
1696 Define this variable to stop the system in case of a
1697 fatal error, so that you have to reset it manually.
1698 This is probably NOT a good idea for an embedded
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001699 system where you want the system to reboot
wdenkc6097192002-11-03 00:24:07 +00001700 automatically as fast as possible, but it may be
1701 useful during development since you can try to debug
1702 the conditions that lead to the situation.
1703
1704 CONFIG_NET_RETRY_COUNT
1705
wdenk43d96162003-03-06 00:02:04 +00001706 This variable defines the number of retries for
1707 network operations like ARP, RARP, TFTP, or BOOTP
1708 before giving up the operation. If not defined, a
1709 default value of 5 is used.
wdenkc6097192002-11-03 00:24:07 +00001710
Guennadi Liakhovetski40cb90e2008-04-03 17:04:19 +02001711 CONFIG_ARP_TIMEOUT
1712
1713 Timeout waiting for an ARP reply in milliseconds.
1714
wdenkc6097192002-11-03 00:24:07 +00001715- Command Interpreter:
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001716 CONFIG_AUTO_COMPLETE
wdenk04a85b32004-04-15 18:22:41 +00001717
1718 Enable auto completion of commands using TAB.
1719
Wolfgang Denka9398e02006-11-27 15:32:42 +01001720 Note that this feature has NOT been implemented yet
1721 for the "hush" shell.
Wolfgang Denk8078f1a2006-10-28 02:28:02 +02001722
1723
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001724 CONFIG_SYS_HUSH_PARSER
wdenkc6097192002-11-03 00:24:07 +00001725
1726 Define this variable to enable the "hush" shell (from
1727 Busybox) as command line interpreter, thus enabling
1728 powerful command line syntax like
1729 if...then...else...fi conditionals or `&&' and '||'
1730 constructs ("shell scripts").
1731
1732 If undefined, you get the old, much simpler behaviour
1733 with a somewhat smaller memory footprint.
1734
1735
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001736 CONFIG_SYS_PROMPT_HUSH_PS2
wdenkc6097192002-11-03 00:24:07 +00001737
1738 This defines the secondary prompt string, which is
1739 printed when the command interpreter needs more input
1740 to complete a command. Usually "> ".
1741
1742 Note:
1743
wdenk8bde7f72003-06-27 21:31:46 +00001744 In the current implementation, the local variables
1745 space and global environment variables space are
1746 separated. Local variables are those you define by
1747 simply typing `name=value'. To access a local
1748 variable later on, you have write `$name' or
1749 `${name}'; to execute the contents of a variable
1750 directly type `$name' at the command prompt.
wdenkc6097192002-11-03 00:24:07 +00001751
wdenk43d96162003-03-06 00:02:04 +00001752 Global environment variables are those you use
1753 setenv/printenv to work with. To run a command stored
1754 in such a variable, you need to use the run command,
1755 and you must not use the '$' sign to access them.
wdenkc6097192002-11-03 00:24:07 +00001756
1757 To store commands and special characters in a
1758 variable, please use double quotation marks
1759 surrounding the whole text of the variable, instead
1760 of the backslashes before semicolons and special
1761 symbols.
1762
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001763- Commandline Editing and History:
1764 CONFIG_CMDLINE_EDITING
1765
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001766 Enable editing and History functions for interactive
Wolfgang Denkb9365a22006-07-21 11:56:05 +02001767 commandline input operations
Wolfgang Denkaa0c71a2006-07-21 11:35:21 +02001768
wdenka8c7c702003-12-06 19:49:23 +00001769- Default Environment:
wdenkc6097192002-11-03 00:24:07 +00001770 CONFIG_EXTRA_ENV_SETTINGS
1771
wdenk43d96162003-03-06 00:02:04 +00001772 Define this to contain any number of null terminated
1773 strings (variable = value pairs) that will be part of
wdenk7152b1d2003-09-05 23:19:14 +00001774 the default environment compiled into the boot image.
wdenk2262cfe2002-11-18 00:14:45 +00001775
wdenk43d96162003-03-06 00:02:04 +00001776 For example, place something like this in your
1777 board's config file:
wdenkc6097192002-11-03 00:24:07 +00001778
1779 #define CONFIG_EXTRA_ENV_SETTINGS \
1780 "myvar1=value1\0" \
1781 "myvar2=value2\0"
1782
wdenk43d96162003-03-06 00:02:04 +00001783 Warning: This method is based on knowledge about the
1784 internal format how the environment is stored by the
1785 U-Boot code. This is NOT an official, exported
1786 interface! Although it is unlikely that this format
wdenk7152b1d2003-09-05 23:19:14 +00001787 will change soon, there is no guarantee either.
wdenkc6097192002-11-03 00:24:07 +00001788 You better know what you are doing here.
1789
wdenk43d96162003-03-06 00:02:04 +00001790 Note: overly (ab)use of the default environment is
1791 discouraged. Make sure to check other ways to preset
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02001792 the environment like the "source" command or the
wdenk43d96162003-03-06 00:02:04 +00001793 boot command first.
wdenkc6097192002-11-03 00:24:07 +00001794
wdenka8c7c702003-12-06 19:49:23 +00001795- DataFlash Support:
wdenk2abbe072003-06-16 23:50:08 +00001796 CONFIG_HAS_DATAFLASH
1797
wdenk8bde7f72003-06-27 21:31:46 +00001798 Defining this option enables DataFlash features and
1799 allows to read/write in Dataflash via the standard
1800 commands cp, md...
wdenk2abbe072003-06-16 23:50:08 +00001801
wdenk3f85ce22004-02-23 16:11:30 +00001802- SystemACE Support:
1803 CONFIG_SYSTEMACE
1804
1805 Adding this option adds support for Xilinx SystemACE
1806 chips attached via some sort of local bus. The address
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001807 of the chip must also be defined in the
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001808 CONFIG_SYS_SYSTEMACE_BASE macro. For example:
wdenk3f85ce22004-02-23 16:11:30 +00001809
1810 #define CONFIG_SYSTEMACE
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02001811 #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
wdenk3f85ce22004-02-23 16:11:30 +00001812
1813 When SystemACE support is added, the "ace" device type
1814 becomes available to the fat commands, i.e. fatls.
1815
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001816- TFTP Fixed UDP Port:
1817 CONFIG_TFTP_PORT
1818
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001819 If this is defined, the environment variable tftpsrcp
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001820 is used to supply the TFTP UDP source port value.
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001821 If tftpsrcp isn't defined, the normal pseudo-random port
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001822 number generator is used.
1823
Wolfgang Denk28cb9372005-09-24 23:25:46 +02001824 Also, the environment variable tftpdstp is used to supply
1825 the TFTP UDP destination port value. If tftpdstp isn't
1826 defined, the normal port 69 is used.
1827
1828 The purpose for tftpsrcp is to allow a TFTP server to
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02001829 blindly start the TFTP transfer using the pre-configured
1830 target IP address and UDP port. This has the effect of
1831 "punching through" the (Windows XP) firewall, allowing
1832 the remainder of the TFTP transfer to proceed normally.
1833 A better solution is to properly configure the firewall,
1834 but sometimes that is not allowed.
1835
wdenka8c7c702003-12-06 19:49:23 +00001836- Show boot progress:
wdenkc6097192002-11-03 00:24:07 +00001837 CONFIG_SHOW_BOOT_PROGRESS
1838
wdenk43d96162003-03-06 00:02:04 +00001839 Defining this option allows to add some board-
1840 specific code (calling a user-provided function
1841 "show_boot_progress(int)") that enables you to show
1842 the system's boot progress on some display (for
1843 example, some LED's) on your board. At the moment,
1844 the following checkpoints are implemented:
wdenkc6097192002-11-03 00:24:07 +00001845
Bartlomiej Sieka4bae9092008-10-01 15:26:31 +02001846- Automatic software updates via TFTP server
1847 CONFIG_UPDATE_TFTP
1848 CONFIG_UPDATE_TFTP_CNT_MAX
1849 CONFIG_UPDATE_TFTP_MSEC_MAX
1850
1851 These options enable and control the auto-update feature;
1852 for a more detailed description refer to doc/README.update.
1853
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001854Legacy uImage format:
1855
wdenkc6097192002-11-03 00:24:07 +00001856 Arg Where When
1857 1 common/cmd_bootm.c before attempting to boot an image
wdenkba56f622004-02-06 23:19:44 +00001858 -1 common/cmd_bootm.c Image header has bad magic number
wdenkc6097192002-11-03 00:24:07 +00001859 2 common/cmd_bootm.c Image header has correct magic number
wdenkba56f622004-02-06 23:19:44 +00001860 -2 common/cmd_bootm.c Image header has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001861 3 common/cmd_bootm.c Image header has correct checksum
wdenkba56f622004-02-06 23:19:44 +00001862 -3 common/cmd_bootm.c Image data has bad checksum
wdenkc6097192002-11-03 00:24:07 +00001863 4 common/cmd_bootm.c Image data has correct checksum
1864 -4 common/cmd_bootm.c Image is for unsupported architecture
1865 5 common/cmd_bootm.c Architecture check OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001866 -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi)
wdenkc6097192002-11-03 00:24:07 +00001867 6 common/cmd_bootm.c Image Type check OK
1868 -6 common/cmd_bootm.c gunzip uncompression error
1869 -7 common/cmd_bootm.c Unimplemented compression type
1870 7 common/cmd_bootm.c Uncompression OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001871 8 common/cmd_bootm.c No uncompress/copy overwrite error
wdenkc6097192002-11-03 00:24:07 +00001872 -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001873
1874 9 common/image.c Start initial ramdisk verification
1875 -10 common/image.c Ramdisk header has bad magic number
1876 -11 common/image.c Ramdisk header has bad checksum
1877 10 common/image.c Ramdisk header is OK
1878 -12 common/image.c Ramdisk data has bad checksum
1879 11 common/image.c Ramdisk data has correct checksum
1880 12 common/image.c Ramdisk verification complete, start loading
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001881 -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001882 13 common/image.c Start multifile image verification
1883 14 common/image.c No initial ramdisk, no multifile, continue.
1884
1885 15 lib_<arch>/bootm.c All preparation done, transferring control to OS
wdenkc6097192002-11-03 00:24:07 +00001886
wdenk11dadd52004-02-27 00:07:27 +00001887 -30 lib_ppc/board.c Fatal error, hang the system
1888 -31 post/post.c POST test failed, detected by post_output_backlog()
1889 -32 post/post.c POST test failed, detected by post_run_single()
wdenk63e73c92004-02-23 22:22:28 +00001890
Heiko Schocher566a4942007-06-22 19:11:54 +02001891 34 common/cmd_doc.c before loading a Image from a DOC device
1892 -35 common/cmd_doc.c Bad usage of "doc" command
1893 35 common/cmd_doc.c correct usage of "doc" command
1894 -36 common/cmd_doc.c No boot device
1895 36 common/cmd_doc.c correct boot device
1896 -37 common/cmd_doc.c Unknown Chip ID on boot device
1897 37 common/cmd_doc.c correct chip ID found, device available
1898 -38 common/cmd_doc.c Read Error on boot device
1899 38 common/cmd_doc.c reading Image header from DOC device OK
1900 -39 common/cmd_doc.c Image header has bad magic number
1901 39 common/cmd_doc.c Image header has correct magic number
1902 -40 common/cmd_doc.c Error reading Image from DOC device
1903 40 common/cmd_doc.c Image header has correct magic number
1904 41 common/cmd_ide.c before loading a Image from a IDE device
1905 -42 common/cmd_ide.c Bad usage of "ide" command
1906 42 common/cmd_ide.c correct usage of "ide" command
1907 -43 common/cmd_ide.c No boot device
1908 43 common/cmd_ide.c boot device found
1909 -44 common/cmd_ide.c Device not available
1910 44 common/cmd_ide.c Device available
1911 -45 common/cmd_ide.c wrong partition selected
1912 45 common/cmd_ide.c partition selected
1913 -46 common/cmd_ide.c Unknown partition table
1914 46 common/cmd_ide.c valid partition table found
1915 -47 common/cmd_ide.c Invalid partition type
1916 47 common/cmd_ide.c correct partition type
1917 -48 common/cmd_ide.c Error reading Image Header on boot device
1918 48 common/cmd_ide.c reading Image Header from IDE device OK
1919 -49 common/cmd_ide.c Image header has bad magic number
1920 49 common/cmd_ide.c Image header has correct magic number
1921 -50 common/cmd_ide.c Image header has bad checksum
1922 50 common/cmd_ide.c Image header has correct checksum
1923 -51 common/cmd_ide.c Error reading Image from IDE device
1924 51 common/cmd_ide.c reading Image from IDE device OK
1925 52 common/cmd_nand.c before loading a Image from a NAND device
1926 -53 common/cmd_nand.c Bad usage of "nand" command
1927 53 common/cmd_nand.c correct usage of "nand" command
1928 -54 common/cmd_nand.c No boot device
1929 54 common/cmd_nand.c boot device found
1930 -55 common/cmd_nand.c Unknown Chip ID on boot device
1931 55 common/cmd_nand.c correct chip ID found, device available
1932 -56 common/cmd_nand.c Error reading Image Header on boot device
1933 56 common/cmd_nand.c reading Image Header from NAND device OK
1934 -57 common/cmd_nand.c Image header has bad magic number
1935 57 common/cmd_nand.c Image header has correct magic number
1936 -58 common/cmd_nand.c Error reading Image from NAND device
1937 58 common/cmd_nand.c reading Image from NAND device OK
wdenkc6097192002-11-03 00:24:07 +00001938
Heiko Schocher566a4942007-06-22 19:11:54 +02001939 -60 common/env_common.c Environment has a bad CRC, using default
wdenkc6097192002-11-03 00:24:07 +00001940
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001941 64 net/eth.c starting with Ethernet configuration.
Heiko Schocher566a4942007-06-22 19:11:54 +02001942 -64 net/eth.c no Ethernet found.
1943 65 net/eth.c Ethernet found.
wdenk206c60c2003-09-18 10:02:25 +00001944
Heiko Schocher566a4942007-06-22 19:11:54 +02001945 -80 common/cmd_net.c usage wrong
1946 80 common/cmd_net.c before calling NetLoop()
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001947 -81 common/cmd_net.c some error in NetLoop() occurred
Heiko Schocher566a4942007-06-22 19:11:54 +02001948 81 common/cmd_net.c NetLoop() back without error
1949 -82 common/cmd_net.c size == 0 (File with size 0 loaded)
1950 82 common/cmd_net.c trying automatic boot
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02001951 83 common/cmd_net.c running "source" command
1952 -83 common/cmd_net.c some error in automatic boot or "source" command
Heiko Schocher566a4942007-06-22 19:11:54 +02001953 84 common/cmd_net.c end without errors
wdenkc6097192002-11-03 00:24:07 +00001954
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001955FIT uImage format:
1956
1957 Arg Where When
1958 100 common/cmd_bootm.c Kernel FIT Image has correct format
1959 -100 common/cmd_bootm.c Kernel FIT Image has incorrect format
1960 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration
1961 -101 common/cmd_bootm.c Can't get configuration for kernel subimage
1962 102 common/cmd_bootm.c Kernel unit name specified
1963 -103 common/cmd_bootm.c Can't get kernel subimage node offset
Marian Balakowiczf773bea2008-03-12 10:35:46 +01001964 103 common/cmd_bootm.c Found configuration node
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001965 104 common/cmd_bootm.c Got kernel subimage node offset
1966 -104 common/cmd_bootm.c Kernel subimage hash verification failed
1967 105 common/cmd_bootm.c Kernel subimage hash verification OK
1968 -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
1969 106 common/cmd_bootm.c Architecture check OK
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001970 -106 common/cmd_bootm.c Kernel subimage has wrong type
1971 107 common/cmd_bootm.c Kernel subimage type OK
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001972 -107 common/cmd_bootm.c Can't get kernel subimage data/size
1973 108 common/cmd_bootm.c Got kernel subimage data/size
1974 -108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
1975 -109 common/cmd_bootm.c Can't get kernel subimage type
1976 -110 common/cmd_bootm.c Can't get kernel subimage comp
1977 -111 common/cmd_bootm.c Can't get kernel subimage os
1978 -112 common/cmd_bootm.c Can't get kernel subimage load address
1979 -113 common/cmd_bootm.c Image uncompress/copy overwrite error
1980
1981 120 common/image.c Start initial ramdisk verification
1982 -120 common/image.c Ramdisk FIT image has incorrect format
1983 121 common/image.c Ramdisk FIT image has correct format
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001984 122 common/image.c No ramdisk subimage unit name, using configuration
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001985 -122 common/image.c Can't get configuration for ramdisk subimage
1986 123 common/image.c Ramdisk unit name specified
1987 -124 common/image.c Can't get ramdisk subimage node offset
1988 125 common/image.c Got ramdisk subimage node offset
1989 -125 common/image.c Ramdisk subimage hash verification failed
1990 126 common/image.c Ramdisk subimage hash verification OK
1991 -126 common/image.c Ramdisk subimage for unsupported architecture
1992 127 common/image.c Architecture check OK
1993 -127 common/image.c Can't get ramdisk subimage data/size
1994 128 common/image.c Got ramdisk subimage data/size
1995 129 common/image.c Can't get ramdisk load address
1996 -129 common/image.c Got ramdisk load address
1997
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02001998 -130 common/cmd_doc.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01001999 131 common/cmd_doc.c FIT image format OK
2000
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002001 -140 common/cmd_ide.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002002 141 common/cmd_ide.c FIT image format OK
2003
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002004 -150 common/cmd_nand.c Incorrect FIT image format
Marian Balakowicz1372cce2008-03-12 10:33:01 +01002005 151 common/cmd_nand.c FIT image format OK
2006
2007
wdenkc6097192002-11-03 00:24:07 +00002008Modem Support:
2009--------------
2010
wdenk85ec0bc2003-03-31 16:34:49 +00002011[so far only for SMDK2400 and TRAB boards]
wdenkc6097192002-11-03 00:24:07 +00002012
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002013- Modem support enable:
wdenkc6097192002-11-03 00:24:07 +00002014 CONFIG_MODEM_SUPPORT
2015
2016- RTS/CTS Flow control enable:
2017 CONFIG_HWFLOW
2018
2019- Modem debug support:
2020 CONFIG_MODEM_SUPPORT_DEBUG
2021
wdenk43d96162003-03-06 00:02:04 +00002022 Enables debugging stuff (char screen[1024], dbg())
2023 for modem support. Useful only with BDI2000.
wdenkc6097192002-11-03 00:24:07 +00002024
wdenka8c7c702003-12-06 19:49:23 +00002025- Interrupt support (PPC):
2026
wdenkd4ca31c2004-01-02 14:00:00 +00002027 There are common interrupt_init() and timer_interrupt()
2028 for all PPC archs. interrupt_init() calls interrupt_init_cpu()
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002029 for CPU specific initialization. interrupt_init_cpu()
wdenkd4ca31c2004-01-02 14:00:00 +00002030 should set decrementer_count to appropriate value. If
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002031 CPU resets decrementer automatically after interrupt
wdenkd4ca31c2004-01-02 14:00:00 +00002032 (ppc4xx) it should set decrementer_count to zero.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002033 timer_interrupt() calls timer_interrupt_cpu() for CPU
wdenkd4ca31c2004-01-02 14:00:00 +00002034 specific handling. If board has watchdog / status_led
2035 / other_activity_monitor it works automatically from
2036 general timer_interrupt().
wdenka8c7c702003-12-06 19:49:23 +00002037
wdenkc6097192002-11-03 00:24:07 +00002038- General:
2039
wdenk43d96162003-03-06 00:02:04 +00002040 In the target system modem support is enabled when a
2041 specific key (key combination) is pressed during
2042 power-on. Otherwise U-Boot will boot normally
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002043 (autoboot). The key_pressed() function is called from
wdenk43d96162003-03-06 00:02:04 +00002044 board_init(). Currently key_pressed() is a dummy
2045 function, returning 1 and thus enabling modem
2046 initialization.
wdenkc6097192002-11-03 00:24:07 +00002047
wdenk43d96162003-03-06 00:02:04 +00002048 If there are no modem init strings in the
2049 environment, U-Boot proceed to autoboot; the
2050 previous output (banner, info printfs) will be
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002051 suppressed, though.
wdenkc6097192002-11-03 00:24:07 +00002052
2053 See also: doc/README.Modem
2054
2055
wdenkc6097192002-11-03 00:24:07 +00002056Configuration Settings:
2057-----------------------
2058
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002059- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
wdenkc6097192002-11-03 00:24:07 +00002060 undefine this when you're short of memory.
2061
Peter Tyser2fb26042009-01-27 18:03:12 -06002062- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
2063 width of the commands listed in the 'help' command output.
2064
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002065- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to
wdenkc6097192002-11-03 00:24:07 +00002066 prompt for user input.
2067
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002068- CONFIG_SYS_CBSIZE: Buffer size for input from the Console
wdenkc6097192002-11-03 00:24:07 +00002069
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002070- CONFIG_SYS_PBSIZE: Buffer size for Console output
wdenkc6097192002-11-03 00:24:07 +00002071
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002072- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands
wdenkc6097192002-11-03 00:24:07 +00002073
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002074- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
wdenkc6097192002-11-03 00:24:07 +00002075 the application (usually a Linux kernel) when it is
2076 booted
2077
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002078- CONFIG_SYS_BAUDRATE_TABLE:
wdenkc6097192002-11-03 00:24:07 +00002079 List of legal baudrate settings for this board.
2080
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002081- CONFIG_SYS_CONSOLE_INFO_QUIET
wdenk8bde7f72003-06-27 21:31:46 +00002082 Suppress display of console information at boot.
wdenkc6097192002-11-03 00:24:07 +00002083
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002084- CONFIG_SYS_CONSOLE_IS_IN_ENV
wdenk8bde7f72003-06-27 21:31:46 +00002085 If the board specific function
2086 extern int overwrite_console (void);
2087 returns 1, the stdin, stderr and stdout are switched to the
wdenkc6097192002-11-03 00:24:07 +00002088 serial port, else the settings in the environment are used.
2089
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002090- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
wdenk8bde7f72003-06-27 21:31:46 +00002091 Enable the call to overwrite_console().
wdenkc6097192002-11-03 00:24:07 +00002092
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002093- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
wdenkc6097192002-11-03 00:24:07 +00002094 Enable overwrite of previous console environment settings.
2095
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002096- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
wdenkc6097192002-11-03 00:24:07 +00002097 Begin and End addresses of the area used by the
2098 simple memory test.
2099
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002100- CONFIG_SYS_ALT_MEMTEST:
wdenk8bde7f72003-06-27 21:31:46 +00002101 Enable an alternate, more extensive memory test.
wdenkc6097192002-11-03 00:24:07 +00002102
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002103- CONFIG_SYS_MEMTEST_SCRATCH:
wdenk5f535fe2003-09-18 09:21:33 +00002104 Scratch address used by the alternate memory test
2105 You only need to set this if address zero isn't writeable
2106
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002107- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
2108 If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
Stefan Roese14f73ca2008-03-26 10:14:11 +01002109 this specified memory area will get subtracted from the top
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002110 (end) of RAM and won't get "touched" at all by U-Boot. By
Stefan Roese14f73ca2008-03-26 10:14:11 +01002111 fixing up gd->ram_size the Linux kernel should gets passed
2112 the now "corrected" memory size and won't touch it either.
2113 This should work for arch/ppc and arch/powerpc. Only Linux
Stefan Roese5e12e752008-03-28 11:02:53 +01002114 board ports in arch/powerpc with bootwrapper support that
Stefan Roese14f73ca2008-03-26 10:14:11 +01002115 recalculate the memory size from the SDRAM controller setup
Stefan Roese5e12e752008-03-28 11:02:53 +01002116 will have to get fixed in Linux additionally.
Stefan Roese14f73ca2008-03-26 10:14:11 +01002117
2118 This option can be used as a workaround for the 440EPx/GRx
2119 CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
2120 be touched.
2121
2122 WARNING: Please make sure that this value is a multiple of
2123 the Linux page size (normally 4k). If this is not the case,
2124 then the end address of the Linux memory will be located at a
2125 non page size aligned address and this could cause major
2126 problems.
2127
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002128- CONFIG_SYS_TFTP_LOADADDR:
wdenkc6097192002-11-03 00:24:07 +00002129 Default load address for network file downloads
2130
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002131- CONFIG_SYS_LOADS_BAUD_CHANGE:
wdenkc6097192002-11-03 00:24:07 +00002132 Enable temporary baudrate change while serial download
2133
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002134- CONFIG_SYS_SDRAM_BASE:
wdenkc6097192002-11-03 00:24:07 +00002135 Physical start address of SDRAM. _Must_ be 0 here.
2136
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002137- CONFIG_SYS_MBIO_BASE:
wdenkc6097192002-11-03 00:24:07 +00002138 Physical start address of Motherboard I/O (if using a
2139 Cogent motherboard)
2140
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002141- CONFIG_SYS_FLASH_BASE:
wdenkc6097192002-11-03 00:24:07 +00002142 Physical start address of Flash memory.
2143
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002144- CONFIG_SYS_MONITOR_BASE:
wdenkc6097192002-11-03 00:24:07 +00002145 Physical start address of boot monitor code (set by
2146 make config files to be same as the text base address
2147 (TEXT_BASE) used when linking) - same as
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002148 CONFIG_SYS_FLASH_BASE when booting from flash.
wdenkc6097192002-11-03 00:24:07 +00002149
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002150- CONFIG_SYS_MONITOR_LEN:
wdenk8bde7f72003-06-27 21:31:46 +00002151 Size of memory reserved for monitor code, used to
2152 determine _at_compile_time_ (!) if the environment is
2153 embedded within the U-Boot image, or in a separate
2154 flash sector.
wdenkc6097192002-11-03 00:24:07 +00002155
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002156- CONFIG_SYS_MALLOC_LEN:
wdenkc6097192002-11-03 00:24:07 +00002157 Size of DRAM reserved for malloc() use.
2158
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002159- CONFIG_SYS_BOOTM_LEN:
Stefan Roese15940c92006-03-13 11:16:36 +01002160 Normally compressed uImages are limited to an
2161 uncompressed size of 8 MBytes. If this is not enough,
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002162 you can define CONFIG_SYS_BOOTM_LEN in your board config file
Stefan Roese15940c92006-03-13 11:16:36 +01002163 to adjust this setting to your needs.
2164
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002165- CONFIG_SYS_BOOTMAPSZ:
wdenkc6097192002-11-03 00:24:07 +00002166 Maximum size of memory mapped by the startup code of
2167 the Linux kernel; all data that must be processed by
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02002168 the Linux kernel (bd_info, boot arguments, FDT blob if
2169 used) must be put below this limit, unless "bootm_low"
2170 enviroment variable is defined and non-zero. In such case
2171 all data for the Linux kernel must be between "bootm_low"
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002172 and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.
wdenkc6097192002-11-03 00:24:07 +00002173
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002174- CONFIG_SYS_MAX_FLASH_BANKS:
wdenkc6097192002-11-03 00:24:07 +00002175 Max number of Flash memory banks
2176
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002177- CONFIG_SYS_MAX_FLASH_SECT:
wdenkc6097192002-11-03 00:24:07 +00002178 Max number of sectors on a Flash chip
2179
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002180- CONFIG_SYS_FLASH_ERASE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00002181 Timeout for Flash erase operations (in ms)
2182
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002183- CONFIG_SYS_FLASH_WRITE_TOUT:
wdenkc6097192002-11-03 00:24:07 +00002184 Timeout for Flash write operations (in ms)
2185
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002186- CONFIG_SYS_FLASH_LOCK_TOUT
wdenk8564acf2003-07-14 22:13:32 +00002187 Timeout for Flash set sector lock bit operation (in ms)
2188
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002189- CONFIG_SYS_FLASH_UNLOCK_TOUT
wdenk8564acf2003-07-14 22:13:32 +00002190 Timeout for Flash clear lock bits operation (in ms)
2191
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002192- CONFIG_SYS_FLASH_PROTECTION
wdenk8564acf2003-07-14 22:13:32 +00002193 If defined, hardware flash sectors protection is used
2194 instead of U-Boot software protection.
2195
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002196- CONFIG_SYS_DIRECT_FLASH_TFTP:
wdenkc6097192002-11-03 00:24:07 +00002197
2198 Enable TFTP transfers directly to flash memory;
2199 without this option such a download has to be
2200 performed in two steps: (1) download to RAM, and (2)
2201 copy from RAM to flash.
2202
2203 The two-step approach is usually more reliable, since
2204 you can check if the download worked before you erase
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002205 the flash, but in some situations (when system RAM is
2206 too limited to allow for a temporary copy of the
wdenkc6097192002-11-03 00:24:07 +00002207 downloaded image) this option may be very useful.
2208
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002209- CONFIG_SYS_FLASH_CFI:
wdenk43d96162003-03-06 00:02:04 +00002210 Define if the flash driver uses extra elements in the
wdenk5653fc32004-02-08 22:55:38 +00002211 common flash structure for storing flash geometry.
2212
Jean-Christophe PLAGNIOL-VILLARD00b18832008-08-13 01:40:42 +02002213- CONFIG_FLASH_CFI_DRIVER
wdenk5653fc32004-02-08 22:55:38 +00002214 This option also enables the building of the cfi_flash driver
2215 in the drivers directory
wdenkc6097192002-11-03 00:24:07 +00002216
Piotr Ziecik91809ed2008-11-17 15:57:58 +01002217- CONFIG_FLASH_CFI_MTD
2218 This option enables the building of the cfi_mtd driver
2219 in the drivers directory. The driver exports CFI flash
2220 to the MTD layer.
2221
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002222- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
Guennadi Liakhovetski96ef8312008-04-03 13:36:02 +02002223 Use buffered writes to flash.
2224
2225- CONFIG_FLASH_SPANSION_S29WS_N
2226 s29ws-n MirrorBit flash has non-standard addresses for buffered
2227 write commands.
2228
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002229- CONFIG_SYS_FLASH_QUIET_TEST
Stefan Roese5568e612005-11-22 13:20:42 +01002230 If this option is defined, the common CFI flash doesn't
2231 print it's warning upon not recognized FLASH banks. This
2232 is useful, if some of the configured banks are only
2233 optionally available.
2234
Jerry Van Baren9a042e92008-03-08 13:48:01 -05002235- CONFIG_FLASH_SHOW_PROGRESS
2236 If defined (must be an integer), print out countdown
2237 digits and dots. Recommended value: 45 (9..1) for 80
2238 column displays, 15 (3..1) for 40 column displays.
2239
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002240- CONFIG_SYS_RX_ETH_BUFFER:
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002241 Defines the number of Ethernet receive buffers. On some
2242 Ethernet controllers it is recommended to set this value
stroese53cf9432003-06-05 15:39:44 +00002243 to 8 or even higher (EEPRO100 or 405 EMAC), since all
2244 buffers can be full shortly after enabling the interface
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002245 on high Ethernet traffic.
stroese53cf9432003-06-05 15:39:44 +00002246 Defaults to 4 if not defined.
2247
wdenkc6097192002-11-03 00:24:07 +00002248The following definitions that deal with the placement and management
2249of environment data (variable area); in general, we support the
2250following configurations:
2251
Jean-Christophe PLAGNIOL-VILLARD5a1aceb2008-09-10 22:48:04 +02002252- CONFIG_ENV_IS_IN_FLASH:
wdenkc6097192002-11-03 00:24:07 +00002253
2254 Define this if the environment is in flash memory.
2255
2256 a) The environment occupies one whole flash sector, which is
2257 "embedded" in the text segment with the U-Boot code. This
2258 happens usually with "bottom boot sector" or "top boot
2259 sector" type flash chips, which have several smaller
2260 sectors at the start or the end. For instance, such a
2261 layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2262 such a case you would place the environment in one of the
2263 4 kB sectors - with U-Boot code before and after it. With
2264 "top boot sector" type flash chips, you would put the
2265 environment in one of the last sectors, leaving a gap
2266 between U-Boot and the environment.
2267
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002268 - CONFIG_ENV_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00002269
2270 Offset of environment data (variable area) to the
2271 beginning of flash memory; for instance, with bottom boot
2272 type flash chips the second sector can be used: the offset
2273 for this sector is given here.
2274
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002275 CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
wdenkc6097192002-11-03 00:24:07 +00002276
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002277 - CONFIG_ENV_ADDR:
wdenkc6097192002-11-03 00:24:07 +00002278
2279 This is just another way to specify the start address of
2280 the flash sector containing the environment (instead of
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002281 CONFIG_ENV_OFFSET).
wdenkc6097192002-11-03 00:24:07 +00002282
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002283 - CONFIG_ENV_SECT_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002284
2285 Size of the sector containing the environment.
2286
2287
2288 b) Sometimes flash chips have few, equal sized, BIG sectors.
2289 In such a case you don't want to spend a whole sector for
2290 the environment.
2291
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002292 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002293
Jean-Christophe PLAGNIOL-VILLARD5a1aceb2008-09-10 22:48:04 +02002294 If you use this in combination with CONFIG_ENV_IS_IN_FLASH
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002295 and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
wdenkc6097192002-11-03 00:24:07 +00002296 of this flash sector for the environment. This saves
2297 memory for the RAM copy of the environment.
2298
2299 It may also save flash memory if you decide to use this
2300 when your environment is "embedded" within U-Boot code,
2301 since then the remainder of the flash sector could be used
2302 for U-Boot code. It should be pointed out that this is
2303 STRONGLY DISCOURAGED from a robustness point of view:
2304 updating the environment in flash makes it always
2305 necessary to erase the WHOLE sector. If something goes
2306 wrong before the contents has been restored from a copy in
2307 RAM, your target system will be dead.
2308
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002309 - CONFIG_ENV_ADDR_REDUND
2310 CONFIG_ENV_SIZE_REDUND
wdenkc6097192002-11-03 00:24:07 +00002311
wdenk43d96162003-03-06 00:02:04 +00002312 These settings describe a second storage area used to hold
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002313 a redundant copy of the environment data, so that there is
wdenk3e386912003-04-05 00:53:31 +00002314 a valid backup copy in case there is a power failure during
wdenk43d96162003-03-06 00:02:04 +00002315 a "saveenv" operation.
wdenkc6097192002-11-03 00:24:07 +00002316
2317BE CAREFUL! Any changes to the flash layout, and some changes to the
2318source code will make it necessary to adapt <board>/u-boot.lds*
2319accordingly!
2320
2321
Jean-Christophe PLAGNIOL-VILLARD9314cee2008-09-10 22:47:59 +02002322- CONFIG_ENV_IS_IN_NVRAM:
wdenkc6097192002-11-03 00:24:07 +00002323
2324 Define this if you have some non-volatile memory device
2325 (NVRAM, battery buffered SRAM) which you want to use for the
2326 environment.
2327
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002328 - CONFIG_ENV_ADDR:
2329 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002330
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002331 These two #defines are used to determine the memory area you
wdenkc6097192002-11-03 00:24:07 +00002332 want to use for environment. It is assumed that this memory
2333 can just be read and written to, without any special
2334 provision.
2335
2336BE CAREFUL! The first access to the environment happens quite early
2337in U-Boot initalization (when we try to get the setting of for the
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002338console baudrate). You *MUST* have mapped your NVRAM area then, or
wdenkc6097192002-11-03 00:24:07 +00002339U-Boot will hang.
2340
2341Please note that even with NVRAM we still use a copy of the
2342environment in RAM: we could work on NVRAM directly, but we want to
2343keep settings there always unmodified except somebody uses "saveenv"
2344to save the current settings.
2345
2346
Jean-Christophe PLAGNIOL-VILLARDbb1f8b42008-09-05 09:19:30 +02002347- CONFIG_ENV_IS_IN_EEPROM:
wdenkc6097192002-11-03 00:24:07 +00002348
2349 Use this if you have an EEPROM or similar serial access
2350 device and a driver for it.
2351
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002352 - CONFIG_ENV_OFFSET:
2353 - CONFIG_ENV_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002354
2355 These two #defines specify the offset and size of the
2356 environment area within the total memory of your EEPROM.
2357
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002358 - CONFIG_SYS_I2C_EEPROM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00002359 If defined, specified the chip address of the EEPROM device.
2360 The default address is zero.
2361
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002362 - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
wdenkc6097192002-11-03 00:24:07 +00002363 If defined, the number of bits used to address bytes in a
2364 single page in the EEPROM device. A 64 byte page, for example
2365 would require six bits.
2366
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002367 - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
wdenkc6097192002-11-03 00:24:07 +00002368 If defined, the number of milliseconds to delay between
wdenkba56f622004-02-06 23:19:44 +00002369 page writes. The default is zero milliseconds.
wdenkc6097192002-11-03 00:24:07 +00002370
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002371 - CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
wdenkc6097192002-11-03 00:24:07 +00002372 The length in bytes of the EEPROM memory array address. Note
2373 that this is NOT the chip address length!
2374
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002375 - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
wdenk5cf91d62004-04-23 20:32:05 +00002376 EEPROM chips that implement "address overflow" are ones
2377 like Catalyst 24WC04/08/16 which has 9/10/11 bits of
2378 address and the extra bits end up in the "chip address" bit
2379 slots. This makes a 24WC08 (1Kbyte) chip look like four 256
2380 byte chips.
2381
2382 Note that we consider the length of the address field to
2383 still be one byte because the extra address bits are hidden
2384 in the chip address.
2385
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002386 - CONFIG_SYS_EEPROM_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002387 The size in bytes of the EEPROM device.
2388
wdenkc6097192002-11-03 00:24:07 +00002389
Jean-Christophe PLAGNIOL-VILLARD057c8492008-09-10 22:47:58 +02002390- CONFIG_ENV_IS_IN_DATAFLASH:
wdenk5779d8d2003-12-06 23:55:10 +00002391
wdenkd4ca31c2004-01-02 14:00:00 +00002392 Define this if you have a DataFlash memory device which you
wdenk5779d8d2003-12-06 23:55:10 +00002393 want to use for the environment.
2394
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002395 - CONFIG_ENV_OFFSET:
2396 - CONFIG_ENV_ADDR:
2397 - CONFIG_ENV_SIZE:
wdenk5779d8d2003-12-06 23:55:10 +00002398
2399 These three #defines specify the offset and size of the
2400 environment area within the total memory of your DataFlash placed
2401 at the specified address.
2402
Jean-Christophe PLAGNIOL-VILLARD51bfee12008-09-10 22:47:58 +02002403- CONFIG_ENV_IS_IN_NAND:
wdenk13a56952004-06-09 14:58:14 +00002404
2405 Define this if you have a NAND device which you want to use
2406 for the environment.
2407
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002408 - CONFIG_ENV_OFFSET:
2409 - CONFIG_ENV_SIZE:
wdenk13a56952004-06-09 14:58:14 +00002410
2411 These two #defines specify the offset and size of the environment
2412 area within the first NAND device.
wdenk5779d8d2003-12-06 23:55:10 +00002413
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002414 - CONFIG_ENV_OFFSET_REDUND
Markus Klotzbuechere443c942006-03-20 18:02:44 +01002415
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002416 This setting describes a second storage area of CONFIG_ENV_SIZE
Markus Klotzbuechere443c942006-03-20 18:02:44 +01002417 size used to hold a redundant copy of the environment data,
2418 so that there is a valid backup copy in case there is a
2419 power failure during a "saveenv" operation.
2420
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +02002421 Note: CONFIG_ENV_OFFSET and CONFIG_ENV_OFFSET_REDUND must be aligned
2422 to a block boundary, and CONFIG_ENV_SIZE must be a multiple of
Markus Klotzbuechere443c942006-03-20 18:02:44 +01002423 the NAND devices block size.
2424
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002425- CONFIG_SYS_SPI_INIT_OFFSET
wdenkc6097192002-11-03 00:24:07 +00002426
2427 Defines offset to the initial SPI buffer area in DPRAM. The
2428 area is used at an early stage (ROM part) if the environment
2429 is configured to reside in the SPI EEPROM: We need a 520 byte
2430 scratch DPRAM area. It is used between the two initialization
2431 calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2432 to be a good choice since it makes it far enough from the
2433 start of the data area as well as from the stack pointer.
2434
Bruce Adlere881cb52007-11-02 13:15:42 -07002435Please note that the environment is read-only until the monitor
wdenkc6097192002-11-03 00:24:07 +00002436has been relocated to RAM and a RAM copy of the environment has been
2437created; also, when using EEPROM you will have to use getenv_r()
2438until then to read environment variables.
2439
wdenk85ec0bc2003-03-31 16:34:49 +00002440The environment is protected by a CRC32 checksum. Before the monitor
2441is relocated into RAM, as a result of a bad CRC you will be working
2442with the compiled-in default environment - *silently*!!! [This is
2443necessary, because the first environment variable we need is the
2444"baudrate" setting for the console - if we have a bad CRC, we don't
2445have any device yet where we could complain.]
wdenkc6097192002-11-03 00:24:07 +00002446
2447Note: once the monitor has been relocated, then it will complain if
2448the default environment is used; a new CRC is computed as soon as you
wdenk85ec0bc2003-03-31 16:34:49 +00002449use the "saveenv" command to store a valid environment.
wdenkc6097192002-11-03 00:24:07 +00002450
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002451- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
wdenk42d1f032003-10-15 23:53:47 +00002452 Echo the inverted Ethernet link state to the fault LED.
wdenkfc3e2162003-10-08 22:33:00 +00002453
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002454 Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
wdenkfc3e2162003-10-08 22:33:00 +00002455 also needs to be defined.
2456
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002457- CONFIG_SYS_FAULT_MII_ADDR:
wdenk42d1f032003-10-15 23:53:47 +00002458 MII address of the PHY to check for the Ethernet link state.
wdenkc6097192002-11-03 00:24:07 +00002459
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002460- CONFIG_SYS_64BIT_VSPRINTF:
wdenkc40b2952004-03-13 23:29:43 +00002461 Makes vsprintf (and all *printf functions) support printing
2462 of 64bit values by using the L quantifier
2463
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002464- CONFIG_SYS_64BIT_STRTOUL:
wdenkc40b2952004-03-13 23:29:43 +00002465 Adds simple_strtoull that returns a 64bit value
2466
Ron Madridf5675aa2009-02-18 14:30:44 -08002467- CONFIG_NS16550_MIN_FUNCTIONS:
2468 Define this if you desire to only have use of the NS16550_init
2469 and NS16550_putc functions for the serial driver located at
2470 drivers/serial/ns16550.c. This option is useful for saving
2471 space for already greatly restricted images, including but not
2472 limited to NAND_SPL configurations.
2473
wdenkc6097192002-11-03 00:24:07 +00002474Low Level (hardware related) configuration options:
wdenkdc7c9a12003-03-26 06:55:25 +00002475---------------------------------------------------
wdenkc6097192002-11-03 00:24:07 +00002476
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002477- CONFIG_SYS_CACHELINE_SIZE:
wdenkc6097192002-11-03 00:24:07 +00002478 Cache Line Size of the CPU.
2479
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002480- CONFIG_SYS_DEFAULT_IMMR:
wdenkc6097192002-11-03 00:24:07 +00002481 Default address of the IMMR after system reset.
wdenk2535d602003-07-17 23:16:40 +00002482
wdenk42d1f032003-10-15 23:53:47 +00002483 Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
2484 and RPXsuper) to be able to adjust the position of
2485 the IMMR register after a reset.
wdenkc6097192002-11-03 00:24:07 +00002486
wdenk7f6c2cb2002-11-10 22:06:23 +00002487- Floppy Disk Support:
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002488 CONFIG_SYS_FDC_DRIVE_NUMBER
wdenk7f6c2cb2002-11-10 22:06:23 +00002489
2490 the default drive number (default value 0)
2491
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002492 CONFIG_SYS_ISA_IO_STRIDE
wdenk7f6c2cb2002-11-10 22:06:23 +00002493
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002494 defines the spacing between FDC chipset registers
wdenk7f6c2cb2002-11-10 22:06:23 +00002495 (default value 1)
2496
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002497 CONFIG_SYS_ISA_IO_OFFSET
wdenk7f6c2cb2002-11-10 22:06:23 +00002498
wdenk43d96162003-03-06 00:02:04 +00002499 defines the offset of register from address. It
2500 depends on which part of the data bus is connected to
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002501 the FDC chipset. (default value 0)
wdenk7f6c2cb2002-11-10 22:06:23 +00002502
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002503 If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
2504 CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
wdenk43d96162003-03-06 00:02:04 +00002505 default value.
wdenk7f6c2cb2002-11-10 22:06:23 +00002506
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002507 if CONFIG_SYS_FDC_HW_INIT is defined, then the function
wdenk43d96162003-03-06 00:02:04 +00002508 fdc_hw_init() is called at the beginning of the FDC
2509 setup. fdc_hw_init() must be provided by the board
2510 source code. It is used to make hardware dependant
2511 initializations.
wdenk7f6c2cb2002-11-10 22:06:23 +00002512
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002513- CONFIG_SYS_IMMR: Physical address of the Internal Memory.
wdenkefe2a4d2004-12-16 21:44:03 +00002514 DO NOT CHANGE unless you know exactly what you're
wdenk25d67122004-12-10 11:40:40 +00002515 doing! (11-4) [MPC8xx/82xx systems only]
wdenkc6097192002-11-03 00:24:07 +00002516
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002517- CONFIG_SYS_INIT_RAM_ADDR:
wdenkc6097192002-11-03 00:24:07 +00002518
wdenk7152b1d2003-09-05 23:19:14 +00002519 Start address of memory area that can be used for
wdenkc6097192002-11-03 00:24:07 +00002520 initial data and stack; please note that this must be
2521 writable memory that is working WITHOUT special
2522 initialization, i. e. you CANNOT use normal RAM which
2523 will become available only after programming the
2524 memory controller and running certain initialization
2525 sequences.
2526
2527 U-Boot uses the following memory types:
2528 - MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2529 - MPC824X: data cache
2530 - PPC4xx: data cache
2531
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002532- CONFIG_SYS_GBL_DATA_OFFSET:
wdenkc6097192002-11-03 00:24:07 +00002533
2534 Offset of the initial data structure in the memory
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002535 area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
2536 CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
wdenkc6097192002-11-03 00:24:07 +00002537 data is located at the end of the available space
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002538 (sometimes written as (CONFIG_SYS_INIT_RAM_END -
2539 CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
2540 below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
2541 CONFIG_SYS_GBL_DATA_OFFSET) downward.
wdenkc6097192002-11-03 00:24:07 +00002542
2543 Note:
2544 On the MPC824X (or other systems that use the data
2545 cache for initial memory) the address chosen for
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002546 CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
wdenkc6097192002-11-03 00:24:07 +00002547 point to an otherwise UNUSED address space between
2548 the top of RAM and the start of the PCI space.
2549
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002550- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6)
wdenkc6097192002-11-03 00:24:07 +00002551
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002552- CONFIG_SYS_SYPCR: System Protection Control (11-9)
wdenkc6097192002-11-03 00:24:07 +00002553
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002554- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26)
wdenkc6097192002-11-03 00:24:07 +00002555
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002556- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31)
wdenkc6097192002-11-03 00:24:07 +00002557
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002558- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30)
wdenkc6097192002-11-03 00:24:07 +00002559
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002560- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27)
wdenkc6097192002-11-03 00:24:07 +00002561
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002562- CONFIG_SYS_OR_TIMING_SDRAM:
wdenkc6097192002-11-03 00:24:07 +00002563 SDRAM timing
2564
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002565- CONFIG_SYS_MAMR_PTA:
wdenkc6097192002-11-03 00:24:07 +00002566 periodic timer for refresh
2567
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002568- CONFIG_SYS_DER: Debug Event Register (37-47)
wdenkc6097192002-11-03 00:24:07 +00002569
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002570- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
2571 CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
2572 CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
2573 CONFIG_SYS_BR1_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00002574 Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2575
2576- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002577 CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
2578 CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
wdenkc6097192002-11-03 00:24:07 +00002579 Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2580
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002581- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
2582 CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
wdenkc6097192002-11-03 00:24:07 +00002583 Machine Mode Register and Memory Periodic Timer
2584 Prescaler definitions (SDRAM timing)
2585
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002586- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00002587 enable I2C microcode relocation patch (MPC8xx);
2588 define relocation offset in DPRAM [DSP2]
2589
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002590- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
Heiko Schocherb423d052008-01-11 01:12:07 +01002591 enable SMC microcode relocation patch (MPC8xx);
2592 define relocation offset in DPRAM [SMC1]
2593
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002594- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
wdenkc6097192002-11-03 00:24:07 +00002595 enable SPI microcode relocation patch (MPC8xx);
2596 define relocation offset in DPRAM [SCC4]
2597
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002598- CONFIG_SYS_USE_OSCCLK:
wdenkc6097192002-11-03 00:24:07 +00002599 Use OSCM clock mode on MBX8xx board. Be careful,
2600 wrong setting might damage your board. Read
2601 doc/README.MBX before setting this variable!
2602
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002603- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
wdenk43d96162003-03-06 00:02:04 +00002604 Offset of the bootmode word in DPRAM used by post
2605 (Power On Self Tests). This definition overrides
2606 #define'd default value in commproc.h resp.
2607 cpm_8260.h.
wdenkea909b72002-11-21 23:11:29 +00002608
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002609- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
2610 CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
2611 CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
2612 CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
2613 CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
2614 CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
2615 CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
2616 CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
wdenk5d232d02003-05-22 22:52:13 +00002617 Overrides the default PCI memory map in cpu/mpc8260/pci.c if set.
2618
Dirk Eibach9cacf4f2009-02-09 08:18:34 +01002619- CONFIG_PCI_DISABLE_PCIE:
2620 Disable PCI-Express on systems where it is supported but not
2621 required.
2622
Ben Warrenbb99ad62006-09-07 16:50:54 -04002623- CONFIG_SPD_EEPROM
Wolfgang Denk218ca722008-03-26 10:40:12 +01002624 Get DDR timing information from an I2C EEPROM. Common
2625 with pluggable memory modules such as SODIMMs
2626
Ben Warrenbb99ad62006-09-07 16:50:54 -04002627 SPD_EEPROM_ADDRESS
2628 I2C address of the SPD EEPROM
2629
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002630- CONFIG_SYS_SPD_BUS_NUM
Wolfgang Denk218ca722008-03-26 10:40:12 +01002631 If SPD EEPROM is on an I2C bus other than the first
2632 one, specify here. Note that the value must resolve
2633 to something your driver can deal with.
Ben Warrenbb99ad62006-09-07 16:50:54 -04002634
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002635- CONFIG_SYS_83XX_DDR_USES_CS0
Wolfgang Denk218ca722008-03-26 10:40:12 +01002636 Only for 83xx systems. If specified, then DDR should
2637 be configured using CS0 and CS1 instead of CS2 and CS3.
Timur Tabi2ad6b512006-10-31 18:44:42 -06002638
wdenkc26e4542004-04-18 10:13:26 +00002639- CONFIG_ETHER_ON_FEC[12]
2640 Define to enable FEC[12] on a 8xx series processor.
2641
2642- CONFIG_FEC[12]_PHY
2643 Define to the hardcoded PHY address which corresponds
wdenk6e592382004-04-18 17:39:38 +00002644 to the given FEC; i. e.
2645 #define CONFIG_FEC1_PHY 4
wdenkc26e4542004-04-18 10:13:26 +00002646 means that the PHY with address 4 is connected to FEC1
2647
2648 When set to -1, means to probe for first available.
2649
2650- CONFIG_FEC[12]_PHY_NORXERR
2651 The PHY does not have a RXERR line (RMII only).
2652 (so program the FEC to ignore it).
2653
2654- CONFIG_RMII
2655 Enable RMII mode for all FECs.
2656 Note that this is a global option, we can't
2657 have one FEC in standard MII mode and another in RMII mode.
2658
wdenk5cf91d62004-04-23 20:32:05 +00002659- CONFIG_CRC32_VERIFY
2660 Add a verify option to the crc32 command.
2661 The syntax is:
2662
2663 => crc32 -v <address> <count> <crc32>
2664
2665 Where address/count indicate a memory area
2666 and crc32 is the correct crc32 which the
2667 area should have.
2668
wdenk56523f12004-07-11 17:40:54 +00002669- CONFIG_LOOPW
2670 Add the "loopw" memory command. This only takes effect if
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002671 the memory commands are activated globally (CONFIG_CMD_MEM).
wdenk56523f12004-07-11 17:40:54 +00002672
stroese7b466642004-12-16 18:46:55 +00002673- CONFIG_MX_CYCLIC
2674 Add the "mdc" and "mwc" memory commands. These are cyclic
2675 "md/mw" commands.
2676 Examples:
2677
wdenkefe2a4d2004-12-16 21:44:03 +00002678 => mdc.b 10 4 500
stroese7b466642004-12-16 18:46:55 +00002679 This command will print 4 bytes (10,11,12,13) each 500 ms.
2680
wdenkefe2a4d2004-12-16 21:44:03 +00002681 => mwc.l 100 12345678 10
stroese7b466642004-12-16 18:46:55 +00002682 This command will write 12345678 to address 100 all 10 ms.
2683
wdenkefe2a4d2004-12-16 21:44:03 +00002684 This only takes effect if the memory commands are activated
Jon Loeliger602ad3b2007-06-11 19:03:39 -05002685 globally (CONFIG_CMD_MEM).
stroese7b466642004-12-16 18:46:55 +00002686
wdenk8aa1a2d2005-04-04 12:44:11 +00002687- CONFIG_SKIP_LOWLEVEL_INIT
2688- CONFIG_SKIP_RELOCATE_UBOOT
2689
wdenk3c2b3d42005-04-05 23:32:21 +00002690 [ARM only] If these variables are defined, then
2691 certain low level initializations (like setting up
2692 the memory controller) are omitted and/or U-Boot does
2693 not relocate itself into RAM.
2694 Normally these variables MUST NOT be defined. The
2695 only exception is when U-Boot is loaded (to RAM) by
2696 some other boot loader or by a debugger which
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002697 performs these initializations itself.
wdenk8aa1a2d2005-04-04 12:44:11 +00002698
wdenk400558b2005-04-02 23:52:25 +00002699
wdenkc6097192002-11-03 00:24:07 +00002700Building the Software:
2701======================
2702
Wolfgang Denk218ca722008-03-26 10:40:12 +01002703Building U-Boot has been tested in several native build environments
2704and in many different cross environments. Of course we cannot support
2705all possibly existing versions of cross development tools in all
2706(potentially obsolete) versions. In case of tool chain problems we
2707recommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
2708which is extensively used to build and test U-Boot.
wdenkc6097192002-11-03 00:24:07 +00002709
Wolfgang Denk218ca722008-03-26 10:40:12 +01002710If you are not using a native environment, it is assumed that you
2711have GNU cross compiling tools available in your path. In this case,
2712you must set the environment variable CROSS_COMPILE in your shell.
2713Note that no changes to the Makefile or any other source files are
2714necessary. For example using the ELDK on a 4xx CPU, please enter:
wdenkc6097192002-11-03 00:24:07 +00002715
Wolfgang Denk218ca722008-03-26 10:40:12 +01002716 $ CROSS_COMPILE=ppc_4xx-
2717 $ export CROSS_COMPILE
wdenkc6097192002-11-03 00:24:07 +00002718
Wolfgang Denk218ca722008-03-26 10:40:12 +01002719U-Boot is intended to be simple to build. After installing the
2720sources you must configure U-Boot for one specific board type. This
wdenkc6097192002-11-03 00:24:07 +00002721is done by typing:
2722
2723 make NAME_config
2724
Wolfgang Denk218ca722008-03-26 10:40:12 +01002725where "NAME_config" is the name of one of the existing configu-
2726rations; see the main Makefile for supported names.
wdenk54387ac2003-10-08 22:45:44 +00002727
wdenk2729af92004-05-03 20:45:30 +00002728Note: for some board special configuration names may exist; check if
2729 additional information is available from the board vendor; for
2730 instance, the TQM823L systems are available without (standard)
2731 or with LCD support. You can select such additional "features"
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02002732 when choosing the configuration, i. e.
wdenkc6097192002-11-03 00:24:07 +00002733
wdenk2729af92004-05-03 20:45:30 +00002734 make TQM823L_config
2735 - will configure for a plain TQM823L, i. e. no LCD support
wdenkc6097192002-11-03 00:24:07 +00002736
wdenk2729af92004-05-03 20:45:30 +00002737 make TQM823L_LCD_config
2738 - will configure for a TQM823L with U-Boot console on LCD
wdenkc6097192002-11-03 00:24:07 +00002739
wdenk2729af92004-05-03 20:45:30 +00002740 etc.
wdenkc6097192002-11-03 00:24:07 +00002741
wdenkc6097192002-11-03 00:24:07 +00002742
wdenk2729af92004-05-03 20:45:30 +00002743Finally, type "make all", and you should get some working U-Boot
2744images ready for download to / installation on your system:
wdenkc6097192002-11-03 00:24:07 +00002745
wdenk2729af92004-05-03 20:45:30 +00002746- "u-boot.bin" is a raw binary image
2747- "u-boot" is an image in ELF binary format
2748- "u-boot.srec" is in Motorola S-Record format
wdenkc6097192002-11-03 00:24:07 +00002749
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002750By default the build is performed locally and the objects are saved
2751in the source directory. One of the two methods can be used to change
2752this behavior and build U-Boot to some external directory:
2753
27541. Add O= to the make command line invocations:
2755
2756 make O=/tmp/build distclean
2757 make O=/tmp/build NAME_config
2758 make O=/tmp/build all
2759
27602. Set environment variable BUILD_DIR to point to the desired location:
2761
2762 export BUILD_DIR=/tmp/build
2763 make distclean
2764 make NAME_config
2765 make all
2766
2767Note that the command line "O=" setting overrides the BUILD_DIR environment
2768variable.
2769
wdenkc6097192002-11-03 00:24:07 +00002770
wdenk2729af92004-05-03 20:45:30 +00002771Please be aware that the Makefiles assume you are using GNU make, so
2772for instance on NetBSD you might need to use "gmake" instead of
2773native "make".
wdenkc6097192002-11-03 00:24:07 +00002774
wdenkc6097192002-11-03 00:24:07 +00002775
wdenk2729af92004-05-03 20:45:30 +00002776If the system board that you have is not listed, then you will need
2777to port U-Boot to your hardware platform. To do this, follow these
2778steps:
wdenkc6097192002-11-03 00:24:07 +00002779
wdenk2729af92004-05-03 20:45:30 +000027801. Add a new configuration option for your board to the toplevel
2781 "Makefile" and to the "MAKEALL" script, using the existing
2782 entries as examples. Note that here and at many other places
2783 boards and other names are listed in alphabetical sort order. Please
2784 keep this order.
27852. Create a new directory to hold your board specific code. Add any
2786 files you need. In your board directory, you will need at least
2787 the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
27883. Create a new configuration file "include/configs/<board>.h" for
2789 your board
27903. If you're porting U-Boot to a new CPU, then also create a new
2791 directory to hold your CPU specific code. Add any files you need.
27924. Run "make <board>_config" with your new name.
27935. Type "make", and you should get a working "u-boot.srec" file
2794 to be installed on your target system.
27956. Debug and solve any problems that might arise.
2796 [Of course, this last step is much harder than it sounds.]
wdenkc6097192002-11-03 00:24:07 +00002797
wdenkc6097192002-11-03 00:24:07 +00002798
wdenk2729af92004-05-03 20:45:30 +00002799Testing of U-Boot Modifications, Ports to New Hardware, etc.:
2800==============================================================
wdenkc6097192002-11-03 00:24:07 +00002801
Wolfgang Denk218ca722008-03-26 10:40:12 +01002802If you have modified U-Boot sources (for instance added a new board
2803or support for new devices, a new CPU, etc.) you are expected to
wdenk2729af92004-05-03 20:45:30 +00002804provide feedback to the other developers. The feedback normally takes
2805the form of a "patch", i. e. a context diff against a certain (latest
Wolfgang Denk218ca722008-03-26 10:40:12 +01002806official or latest in the git repository) version of U-Boot sources.
wdenkc6097192002-11-03 00:24:07 +00002807
Wolfgang Denk218ca722008-03-26 10:40:12 +01002808But before you submit such a patch, please verify that your modifi-
2809cation did not break existing code. At least make sure that *ALL* of
wdenk2729af92004-05-03 20:45:30 +00002810the supported boards compile WITHOUT ANY compiler warnings. To do so,
2811just run the "MAKEALL" script, which will configure and build U-Boot
Wolfgang Denk218ca722008-03-26 10:40:12 +01002812for ALL supported system. Be warned, this will take a while. You can
2813select which (cross) compiler to use by passing a `CROSS_COMPILE'
2814environment variable to the script, i. e. to use the ELDK cross tools
2815you can type
wdenkc6097192002-11-03 00:24:07 +00002816
wdenk2729af92004-05-03 20:45:30 +00002817 CROSS_COMPILE=ppc_8xx- MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002818
wdenk2729af92004-05-03 20:45:30 +00002819or to build on a native PowerPC system you can type
wdenkc6097192002-11-03 00:24:07 +00002820
wdenk2729af92004-05-03 20:45:30 +00002821 CROSS_COMPILE=' ' MAKEALL
wdenkc6097192002-11-03 00:24:07 +00002822
Wolfgang Denk218ca722008-03-26 10:40:12 +01002823When using the MAKEALL script, the default behaviour is to build
2824U-Boot in the source directory. This location can be changed by
2825setting the BUILD_DIR environment variable. Also, for each target
2826built, the MAKEALL script saves two log files (<target>.ERR and
2827<target>.MAKEALL) in the <source dir>/LOG directory. This default
2828location can be changed by setting the MAKEALL_LOGDIR environment
2829variable. For example:
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002830
2831 export BUILD_DIR=/tmp/build
2832 export MAKEALL_LOGDIR=/tmp/log
2833 CROSS_COMPILE=ppc_8xx- MAKEALL
2834
Wolfgang Denk218ca722008-03-26 10:40:12 +01002835With the above settings build objects are saved in the /tmp/build,
2836log files are saved in the /tmp/log and the source tree remains clean
2837during the whole build process.
Marian Balakowiczbaf31242006-09-07 17:25:40 +02002838
2839
wdenk2729af92004-05-03 20:45:30 +00002840See also "U-Boot Porting Guide" below.
wdenkc6097192002-11-03 00:24:07 +00002841
wdenkc6097192002-11-03 00:24:07 +00002842
wdenk2729af92004-05-03 20:45:30 +00002843Monitor Commands - Overview:
2844============================
wdenkc6097192002-11-03 00:24:07 +00002845
wdenk2729af92004-05-03 20:45:30 +00002846go - start application at address 'addr'
2847run - run commands in an environment variable
2848bootm - boot application image from memory
2849bootp - boot image via network using BootP/TFTP protocol
2850tftpboot- boot image via network using TFTP protocol
2851 and env variables "ipaddr" and "serverip"
2852 (and eventually "gatewayip")
2853rarpboot- boot image via network using RARP/TFTP protocol
2854diskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd'
2855loads - load S-Record file over serial line
2856loadb - load binary file over serial line (kermit mode)
2857md - memory display
2858mm - memory modify (auto-incrementing)
2859nm - memory modify (constant address)
2860mw - memory write (fill)
2861cp - memory copy
2862cmp - memory compare
2863crc32 - checksum calculation
2864imd - i2c memory display
2865imm - i2c memory modify (auto-incrementing)
2866inm - i2c memory modify (constant address)
2867imw - i2c memory write (fill)
2868icrc32 - i2c checksum calculation
2869iprobe - probe to discover valid I2C chip addresses
2870iloop - infinite loop on address range
2871isdram - print SDRAM configuration information
2872sspi - SPI utility commands
2873base - print or set address offset
2874printenv- print environment variables
2875setenv - set environment variables
2876saveenv - save environment variables to persistent storage
2877protect - enable or disable FLASH write protection
2878erase - erase FLASH memory
2879flinfo - print FLASH memory information
2880bdinfo - print Board Info structure
2881iminfo - print header information for application image
2882coninfo - print console devices and informations
2883ide - IDE sub-system
2884loop - infinite loop on address range
wdenk56523f12004-07-11 17:40:54 +00002885loopw - infinite write loop on address range
wdenk2729af92004-05-03 20:45:30 +00002886mtest - simple RAM test
2887icache - enable or disable instruction cache
2888dcache - enable or disable data cache
2889reset - Perform RESET of the CPU
2890echo - echo args to console
2891version - print monitor version
2892help - print online help
2893? - alias for 'help'
wdenkc6097192002-11-03 00:24:07 +00002894
wdenkc6097192002-11-03 00:24:07 +00002895
wdenk2729af92004-05-03 20:45:30 +00002896Monitor Commands - Detailed Description:
2897========================================
wdenkc6097192002-11-03 00:24:07 +00002898
wdenk2729af92004-05-03 20:45:30 +00002899TODO.
wdenkc6097192002-11-03 00:24:07 +00002900
wdenk2729af92004-05-03 20:45:30 +00002901For now: just type "help <command>".
wdenkc6097192002-11-03 00:24:07 +00002902
2903
wdenk2729af92004-05-03 20:45:30 +00002904Environment Variables:
2905======================
wdenkc6097192002-11-03 00:24:07 +00002906
wdenk2729af92004-05-03 20:45:30 +00002907U-Boot supports user configuration using Environment Variables which
2908can be made persistent by saving to Flash memory.
wdenkc6097192002-11-03 00:24:07 +00002909
wdenk2729af92004-05-03 20:45:30 +00002910Environment Variables are set using "setenv", printed using
2911"printenv", and saved to Flash using "saveenv". Using "setenv"
2912without a value can be used to delete a variable from the
2913environment. As long as you don't save the environment you are
2914working with an in-memory copy. In case the Flash area containing the
2915environment is erased by accident, a default environment is provided.
wdenkc6097192002-11-03 00:24:07 +00002916
wdenk2729af92004-05-03 20:45:30 +00002917Some configuration options can be set using Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00002918
wdenk2729af92004-05-03 20:45:30 +00002919 baudrate - see CONFIG_BAUDRATE
wdenkc6097192002-11-03 00:24:07 +00002920
wdenk2729af92004-05-03 20:45:30 +00002921 bootdelay - see CONFIG_BOOTDELAY
wdenkc6097192002-11-03 00:24:07 +00002922
wdenk2729af92004-05-03 20:45:30 +00002923 bootcmd - see CONFIG_BOOTCOMMAND
wdenkc6097192002-11-03 00:24:07 +00002924
wdenk2729af92004-05-03 20:45:30 +00002925 bootargs - Boot arguments when booting an RTOS image
wdenkc6097192002-11-03 00:24:07 +00002926
wdenk2729af92004-05-03 20:45:30 +00002927 bootfile - Name of the image to load with TFTP
wdenkc6097192002-11-03 00:24:07 +00002928
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02002929 bootm_low - Memory range available for image processing in the bootm
2930 command can be restricted. This variable is given as
2931 a hexadecimal number and defines lowest address allowed
2932 for use by the bootm command. See also "bootm_size"
2933 environment variable. Address defined by "bootm_low" is
2934 also the base of the initial memory mapping for the Linux
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002935 kernel -- see the description of CONFIG_SYS_BOOTMAPSZ.
Bartlomiej Sieka7d721e32008-04-14 15:44:16 +02002936
2937 bootm_size - Memory range available for image processing in the bootm
2938 command can be restricted. This variable is given as
2939 a hexadecimal number and defines the size of the region
2940 allowed for use by the bootm command. See also "bootm_low"
2941 environment variable.
2942
Bartlomiej Sieka4bae9092008-10-01 15:26:31 +02002943 updatefile - Location of the software update file on a TFTP server, used
2944 by the automatic software update feature. Please refer to
2945 documentation in doc/README.update for more details.
2946
wdenk2729af92004-05-03 20:45:30 +00002947 autoload - if set to "no" (any string beginning with 'n'),
2948 "bootp" will just load perform a lookup of the
2949 configuration from the BOOTP server, but not try to
2950 load any image using TFTP
wdenkc6097192002-11-03 00:24:07 +00002951
Marian Balakowicz3310c542008-03-12 12:13:13 +01002952 autoscript - if set to "yes" commands like "loadb", "loady",
2953 "bootp", "tftpb", "rarpboot" and "nfs" will attempt
2954 to automatically run script images (by internally
Wolfgang Denk74de7ae2009-04-01 23:34:12 +02002955 calling "source").
Marian Balakowicz3310c542008-03-12 12:13:13 +01002956
2957 autoscript_uname - if script image is in a format (FIT) this
2958 variable is used to get script subimage unit name.
2959
wdenk2729af92004-05-03 20:45:30 +00002960 autostart - if set to "yes", an image loaded using the "bootp",
2961 "rarpboot", "tftpboot" or "diskboot" commands will
2962 be automatically started (by internally calling
2963 "bootm")
wdenkc6097192002-11-03 00:24:07 +00002964
wdenk2729af92004-05-03 20:45:30 +00002965 If set to "no", a standalone image passed to the
2966 "bootm" command will be copied to the load address
2967 (and eventually uncompressed), but NOT be started.
2968 This can be used to load and uncompress arbitrary
2969 data.
wdenkc6097192002-11-03 00:24:07 +00002970
wdenk17ea1172004-06-06 21:51:03 +00002971 i2cfast - (PPC405GP|PPC405EP only)
2972 if set to 'y' configures Linux I2C driver for fast
2973 mode (400kHZ). This environment variable is used in
2974 initialization code. So, for changes to be effective
2975 it must be saved and board must be reset.
2976
wdenk2729af92004-05-03 20:45:30 +00002977 initrd_high - restrict positioning of initrd images:
2978 If this variable is not set, initrd images will be
2979 copied to the highest possible address in RAM; this
2980 is usually what you want since it allows for
2981 maximum initrd size. If for some reason you want to
2982 make sure that the initrd image is loaded below the
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02002983 CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
wdenk2729af92004-05-03 20:45:30 +00002984 variable to a value of "no" or "off" or "0".
2985 Alternatively, you can set it to a maximum upper
2986 address to use (U-Boot will still check that it
2987 does not overwrite the U-Boot stack and data).
wdenkc6097192002-11-03 00:24:07 +00002988
wdenk2729af92004-05-03 20:45:30 +00002989 For instance, when you have a system with 16 MB
2990 RAM, and want to reserve 4 MB from use by Linux,
2991 you can do this by adding "mem=12M" to the value of
2992 the "bootargs" variable. However, now you must make
2993 sure that the initrd image is placed in the first
2994 12 MB as well - this can be done with
wdenkc6097192002-11-03 00:24:07 +00002995
wdenk2729af92004-05-03 20:45:30 +00002996 setenv initrd_high 00c00000
wdenkc6097192002-11-03 00:24:07 +00002997
wdenk2729af92004-05-03 20:45:30 +00002998 If you set initrd_high to 0xFFFFFFFF, this is an
2999 indication to U-Boot that all addresses are legal
3000 for the Linux kernel, including addresses in flash
3001 memory. In this case U-Boot will NOT COPY the
3002 ramdisk at all. This may be useful to reduce the
3003 boot time on your system, but requires that this
3004 feature is supported by your Linux kernel.
wdenk4a6fd342003-04-12 23:38:12 +00003005
wdenk2729af92004-05-03 20:45:30 +00003006 ipaddr - IP address; needed for tftpboot command
wdenkc6097192002-11-03 00:24:07 +00003007
wdenk2729af92004-05-03 20:45:30 +00003008 loadaddr - Default load address for commands like "bootp",
3009 "rarpboot", "tftpboot", "loadb" or "diskboot"
wdenkc6097192002-11-03 00:24:07 +00003010
wdenk2729af92004-05-03 20:45:30 +00003011 loads_echo - see CONFIG_LOADS_ECHO
wdenkc6097192002-11-03 00:24:07 +00003012
wdenk2729af92004-05-03 20:45:30 +00003013 serverip - TFTP server IP address; needed for tftpboot command
wdenk38b99262003-05-23 23:18:21 +00003014
wdenk2729af92004-05-03 20:45:30 +00003015 bootretry - see CONFIG_BOOT_RETRY_TIME
wdenkc6097192002-11-03 00:24:07 +00003016
wdenk2729af92004-05-03 20:45:30 +00003017 bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR
wdenkc6097192002-11-03 00:24:07 +00003018
wdenk2729af92004-05-03 20:45:30 +00003019 bootstopkey - see CONFIG_AUTOBOOT_STOP_STR
wdenkc6097192002-11-03 00:24:07 +00003020
wdenk2729af92004-05-03 20:45:30 +00003021 ethprime - When CONFIG_NET_MULTI is enabled controls which
3022 interface is used first.
wdenkc6097192002-11-03 00:24:07 +00003023
wdenk2729af92004-05-03 20:45:30 +00003024 ethact - When CONFIG_NET_MULTI is enabled controls which
3025 interface is currently active. For example you
3026 can do the following
wdenkc6097192002-11-03 00:24:07 +00003027
wdenk2729af92004-05-03 20:45:30 +00003028 => setenv ethact FEC ETHERNET
3029 => ping 192.168.0.1 # traffic sent on FEC ETHERNET
3030 => setenv ethact SCC ETHERNET
3031 => ping 10.0.0.1 # traffic sent on SCC ETHERNET
wdenkc6097192002-11-03 00:24:07 +00003032
Matthias Fuchse1692572008-01-17 07:45:05 +01003033 ethrotate - When set to "no" U-Boot does not go through all
3034 available network interfaces.
3035 It just stays at the currently selected interface.
3036
wdenk2729af92004-05-03 20:45:30 +00003037 netretry - When set to "no" each network operation will
3038 either succeed or fail without retrying.
3039 When set to "once" the network operation will
3040 fail when all the available network interfaces
3041 are tried once without success.
3042 Useful on scripts which control the retry operation
3043 themselves.
wdenkc6097192002-11-03 00:24:07 +00003044
Jean-Christophe PLAGNIOL-VILLARDb4e2f892009-01-31 09:53:39 +01003045 npe_ucode - set load address for the NPE microcode
Jean-Christophe PLAGNIOL-VILLARDa1cf0272008-01-07 08:41:34 +01003046
Wolfgang Denk28cb9372005-09-24 23:25:46 +02003047 tftpsrcport - If this is set, the value is used for TFTP's
Wolfgang Denkecb0ccd2005-09-24 22:37:32 +02003048 UDP source port.
3049
Wolfgang Denk28cb9372005-09-24 23:25:46 +02003050 tftpdstport - If this is set, the value is used for TFTP's UDP
3051 destination port instead of the Well Know Port 69.
3052
wdenk2729af92004-05-03 20:45:30 +00003053 vlan - When set to a value < 4095 the traffic over
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003054 Ethernet is encapsulated/received over 802.1q
wdenk2729af92004-05-03 20:45:30 +00003055 VLAN tagged frames.
wdenka3d991b2004-04-15 21:48:45 +00003056
wdenk2729af92004-05-03 20:45:30 +00003057The following environment variables may be used and automatically
3058updated by the network boot commands ("bootp" and "rarpboot"),
3059depending the information provided by your boot server:
wdenka3d991b2004-04-15 21:48:45 +00003060
wdenk2729af92004-05-03 20:45:30 +00003061 bootfile - see above
3062 dnsip - IP address of your Domain Name Server
3063 dnsip2 - IP address of your secondary Domain Name Server
3064 gatewayip - IP address of the Gateway (Router) to use
3065 hostname - Target hostname
3066 ipaddr - see above
3067 netmask - Subnet Mask
3068 rootpath - Pathname of the root filesystem on the NFS server
3069 serverip - see above
wdenka3d991b2004-04-15 21:48:45 +00003070
wdenka3d991b2004-04-15 21:48:45 +00003071
wdenk2729af92004-05-03 20:45:30 +00003072There are two special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00003073
wdenk2729af92004-05-03 20:45:30 +00003074 serial# - contains hardware identification information such
3075 as type string and/or serial number
3076 ethaddr - Ethernet address
wdenkc6097192002-11-03 00:24:07 +00003077
wdenk2729af92004-05-03 20:45:30 +00003078These variables can be set only once (usually during manufacturing of
3079the board). U-Boot refuses to delete or overwrite these variables
3080once they have been set once.
wdenkc6097192002-11-03 00:24:07 +00003081
3082
wdenk2729af92004-05-03 20:45:30 +00003083Further special Environment Variables:
wdenkc6097192002-11-03 00:24:07 +00003084
wdenk2729af92004-05-03 20:45:30 +00003085 ver - Contains the U-Boot version string as printed
3086 with the "version" command. This variable is
3087 readonly (see CONFIG_VERSION_VARIABLE).
wdenkc6097192002-11-03 00:24:07 +00003088
wdenkc6097192002-11-03 00:24:07 +00003089
wdenk2729af92004-05-03 20:45:30 +00003090Please note that changes to some configuration parameters may take
3091only effect after the next boot (yes, that's just like Windoze :-).
wdenkc6097192002-11-03 00:24:07 +00003092
stroesec1551ea2003-04-04 15:53:41 +00003093
wdenk2729af92004-05-03 20:45:30 +00003094Command Line Parsing:
3095=====================
stroesec1551ea2003-04-04 15:53:41 +00003096
wdenk2729af92004-05-03 20:45:30 +00003097There are two different command line parsers available with U-Boot:
3098the old "simple" one, and the much more powerful "hush" shell:
stroesec1551ea2003-04-04 15:53:41 +00003099
wdenk2729af92004-05-03 20:45:30 +00003100Old, simple command line parser:
3101--------------------------------
wdenkc6097192002-11-03 00:24:07 +00003102
wdenk2729af92004-05-03 20:45:30 +00003103- supports environment variables (through setenv / saveenv commands)
3104- several commands on one line, separated by ';'
Wolfgang Denkfe126d82005-11-20 21:40:11 +01003105- variable substitution using "... ${name} ..." syntax
wdenk2729af92004-05-03 20:45:30 +00003106- special characters ('$', ';') can be escaped by prefixing with '\',
3107 for example:
Wolfgang Denkfe126d82005-11-20 21:40:11 +01003108 setenv bootcmd bootm \${address}
wdenk2729af92004-05-03 20:45:30 +00003109- You can also escape text by enclosing in single apostrophes, for example:
3110 setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
wdenkc6097192002-11-03 00:24:07 +00003111
wdenk2729af92004-05-03 20:45:30 +00003112Hush shell:
3113-----------
wdenkf07771c2003-05-28 08:06:31 +00003114
wdenk2729af92004-05-03 20:45:30 +00003115- similar to Bourne shell, with control structures like
3116 if...then...else...fi, for...do...done; while...do...done,
3117 until...do...done, ...
3118- supports environment ("global") variables (through setenv / saveenv
3119 commands) and local shell variables (through standard shell syntax
3120 "name=value"); only environment variables can be used with "run"
3121 command
wdenkf07771c2003-05-28 08:06:31 +00003122
wdenk2729af92004-05-03 20:45:30 +00003123General rules:
3124--------------
wdenkf07771c2003-05-28 08:06:31 +00003125
wdenk2729af92004-05-03 20:45:30 +00003126(1) If a command line (or an environment variable executed by a "run"
3127 command) contains several commands separated by semicolon, and
3128 one of these commands fails, then the remaining commands will be
3129 executed anyway.
wdenkf07771c2003-05-28 08:06:31 +00003130
wdenk2729af92004-05-03 20:45:30 +00003131(2) If you execute several variables with one call to run (i. e.
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003132 calling run with a list of variables as arguments), any failing
wdenk2729af92004-05-03 20:45:30 +00003133 command will cause "run" to terminate, i. e. the remaining
3134 variables are not executed.
wdenkf07771c2003-05-28 08:06:31 +00003135
wdenk2729af92004-05-03 20:45:30 +00003136Note for Redundant Ethernet Interfaces:
3137=======================================
wdenkf07771c2003-05-28 08:06:31 +00003138
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003139Some boards come with redundant Ethernet interfaces; U-Boot supports
wdenk2729af92004-05-03 20:45:30 +00003140such configurations and is capable of automatic selection of a
3141"working" interface when needed. MAC assignment works as follows:
wdenkf07771c2003-05-28 08:06:31 +00003142
wdenk2729af92004-05-03 20:45:30 +00003143Network interfaces are numbered eth0, eth1, eth2, ... Corresponding
3144MAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3145"eth1addr" (=>eth1), "eth2addr", ...
wdenkf07771c2003-05-28 08:06:31 +00003146
wdenk2729af92004-05-03 20:45:30 +00003147If the network interface stores some valid MAC address (for instance
3148in SROM), this is used as default address if there is NO correspon-
3149ding setting in the environment; if the corresponding environment
3150variable is set, this overrides the settings in the card; that means:
wdenkf07771c2003-05-28 08:06:31 +00003151
wdenk2729af92004-05-03 20:45:30 +00003152o If the SROM has a valid MAC address, and there is no address in the
3153 environment, the SROM's address is used.
wdenkc6097192002-11-03 00:24:07 +00003154
wdenk2729af92004-05-03 20:45:30 +00003155o If there is no valid address in the SROM, and a definition in the
3156 environment exists, then the value from the environment variable is
3157 used.
wdenkc6097192002-11-03 00:24:07 +00003158
wdenk2729af92004-05-03 20:45:30 +00003159o If both the SROM and the environment contain a MAC address, and
3160 both addresses are the same, this MAC address is used.
wdenkc6097192002-11-03 00:24:07 +00003161
wdenk2729af92004-05-03 20:45:30 +00003162o If both the SROM and the environment contain a MAC address, and the
3163 addresses differ, the value from the environment is used and a
3164 warning is printed.
wdenkc6097192002-11-03 00:24:07 +00003165
wdenk2729af92004-05-03 20:45:30 +00003166o If neither SROM nor the environment contain a MAC address, an error
3167 is raised.
wdenkc6097192002-11-03 00:24:07 +00003168
wdenkc6097192002-11-03 00:24:07 +00003169
wdenk2729af92004-05-03 20:45:30 +00003170Image Formats:
3171==============
wdenkc6097192002-11-03 00:24:07 +00003172
Marian Balakowicz3310c542008-03-12 12:13:13 +01003173U-Boot is capable of booting (and performing other auxiliary operations on)
3174images in two formats:
3175
3176New uImage format (FIT)
3177-----------------------
3178
3179Flexible and powerful format based on Flattened Image Tree -- FIT (similar
3180to Flattened Device Tree). It allows the use of images with multiple
3181components (several kernels, ramdisks, etc.), with contents protected by
3182SHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
3183
3184
3185Old uImage format
3186-----------------
3187
3188Old image format is based on binary files which can be basically anything,
3189preceded by a special header; see the definitions in include/image.h for
3190details; basically, the header defines the following image properties:
wdenkc6097192002-11-03 00:24:07 +00003191
wdenk2729af92004-05-03 20:45:30 +00003192* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3193 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
Peter Tyserf5ed9e32008-09-08 14:56:49 -05003194 LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
3195 Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
3196 INTEGRITY).
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02003197* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
wdenk2729af92004-05-03 20:45:30 +00003198 IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
Wolfgang Denk7b64fef2006-10-24 14:21:16 +02003199 Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC).
wdenk2729af92004-05-03 20:45:30 +00003200* Compression Type (uncompressed, gzip, bzip2)
3201* Load Address
3202* Entry Point
3203* Image Name
3204* Image Timestamp
wdenkc6097192002-11-03 00:24:07 +00003205
wdenk2729af92004-05-03 20:45:30 +00003206The header is marked by a special Magic Number, and both the header
3207and the data portions of the image are secured against corruption by
3208CRC32 checksums.
wdenkc6097192002-11-03 00:24:07 +00003209
wdenkc6097192002-11-03 00:24:07 +00003210
wdenk2729af92004-05-03 20:45:30 +00003211Linux Support:
3212==============
wdenkc6097192002-11-03 00:24:07 +00003213
wdenk2729af92004-05-03 20:45:30 +00003214Although U-Boot should support any OS or standalone application
3215easily, the main focus has always been on Linux during the design of
3216U-Boot.
wdenkc6097192002-11-03 00:24:07 +00003217
wdenk2729af92004-05-03 20:45:30 +00003218U-Boot includes many features that so far have been part of some
3219special "boot loader" code within the Linux kernel. Also, any
3220"initrd" images to be used are no longer part of one big Linux image;
3221instead, kernel and "initrd" are separate images. This implementation
3222serves several purposes:
wdenkc6097192002-11-03 00:24:07 +00003223
wdenk2729af92004-05-03 20:45:30 +00003224- the same features can be used for other OS or standalone
3225 applications (for instance: using compressed images to reduce the
3226 Flash memory footprint)
wdenkc6097192002-11-03 00:24:07 +00003227
wdenk2729af92004-05-03 20:45:30 +00003228- it becomes much easier to port new Linux kernel versions because
3229 lots of low-level, hardware dependent stuff are done by U-Boot
wdenkc6097192002-11-03 00:24:07 +00003230
wdenk2729af92004-05-03 20:45:30 +00003231- the same Linux kernel image can now be used with different "initrd"
3232 images; of course this also means that different kernel images can
3233 be run with the same "initrd". This makes testing easier (you don't
3234 have to build a new "zImage.initrd" Linux image when you just
3235 change a file in your "initrd"). Also, a field-upgrade of the
3236 software is easier now.
wdenkc6097192002-11-03 00:24:07 +00003237
wdenkc6097192002-11-03 00:24:07 +00003238
wdenk2729af92004-05-03 20:45:30 +00003239Linux HOWTO:
3240============
wdenkc6097192002-11-03 00:24:07 +00003241
wdenk2729af92004-05-03 20:45:30 +00003242Porting Linux to U-Boot based systems:
3243---------------------------------------
wdenkc6097192002-11-03 00:24:07 +00003244
wdenk2729af92004-05-03 20:45:30 +00003245U-Boot cannot save you from doing all the necessary modifications to
3246configure the Linux device drivers for use with your target hardware
3247(no, we don't intend to provide a full virtual machine interface to
3248Linux :-).
wdenkc6097192002-11-03 00:24:07 +00003249
wdenk2729af92004-05-03 20:45:30 +00003250But now you can ignore ALL boot loader code (in arch/ppc/mbxboot).
wdenkc6097192002-11-03 00:24:07 +00003251
wdenk2729af92004-05-03 20:45:30 +00003252Just make sure your machine specific header file (for instance
3253include/asm-ppc/tqm8xx.h) includes the same definition of the Board
Markus Heidelberg1dc30692008-09-07 20:18:27 +02003254Information structure as we define in include/asm-<arch>/u-boot.h,
3255and make sure that your definition of IMAP_ADDR uses the same value
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003256as your U-Boot configuration in CONFIG_SYS_IMMR.
wdenkc6097192002-11-03 00:24:07 +00003257
wdenkc6097192002-11-03 00:24:07 +00003258
wdenk2729af92004-05-03 20:45:30 +00003259Configuring the Linux kernel:
3260-----------------------------
wdenkc6097192002-11-03 00:24:07 +00003261
wdenk2729af92004-05-03 20:45:30 +00003262No specific requirements for U-Boot. Make sure you have some root
3263device (initial ramdisk, NFS) for your target system.
wdenkc6097192002-11-03 00:24:07 +00003264
wdenkc6097192002-11-03 00:24:07 +00003265
wdenk2729af92004-05-03 20:45:30 +00003266Building a Linux Image:
3267-----------------------
wdenkc6097192002-11-03 00:24:07 +00003268
wdenk2729af92004-05-03 20:45:30 +00003269With U-Boot, "normal" build targets like "zImage" or "bzImage" are
3270not used. If you use recent kernel source, a new build target
3271"uImage" will exist which automatically builds an image usable by
3272U-Boot. Most older kernels also have support for a "pImage" target,
3273which was introduced for our predecessor project PPCBoot and uses a
3274100% compatible format.
wdenkc6097192002-11-03 00:24:07 +00003275
wdenk2729af92004-05-03 20:45:30 +00003276Example:
wdenkc6097192002-11-03 00:24:07 +00003277
wdenk2729af92004-05-03 20:45:30 +00003278 make TQM850L_config
3279 make oldconfig
3280 make dep
3281 make uImage
wdenkc6097192002-11-03 00:24:07 +00003282
wdenk2729af92004-05-03 20:45:30 +00003283The "uImage" build target uses a special tool (in 'tools/mkimage') to
3284encapsulate a compressed Linux kernel image with header information,
3285CRC32 checksum etc. for use with U-Boot. This is what we are doing:
wdenkc6097192002-11-03 00:24:07 +00003286
wdenk2729af92004-05-03 20:45:30 +00003287* build a standard "vmlinux" kernel image (in ELF binary format):
wdenkc6097192002-11-03 00:24:07 +00003288
wdenk2729af92004-05-03 20:45:30 +00003289* convert the kernel into a raw binary image:
wdenkc6097192002-11-03 00:24:07 +00003290
wdenk2729af92004-05-03 20:45:30 +00003291 ${CROSS_COMPILE}-objcopy -O binary \
3292 -R .note -R .comment \
3293 -S vmlinux linux.bin
wdenkc6097192002-11-03 00:24:07 +00003294
wdenk2729af92004-05-03 20:45:30 +00003295* compress the binary image:
wdenkc6097192002-11-03 00:24:07 +00003296
wdenk2729af92004-05-03 20:45:30 +00003297 gzip -9 linux.bin
wdenkc6097192002-11-03 00:24:07 +00003298
wdenk2729af92004-05-03 20:45:30 +00003299* package compressed binary image for U-Boot:
wdenk24ee89b2002-11-03 17:56:27 +00003300
wdenk2729af92004-05-03 20:45:30 +00003301 mkimage -A ppc -O linux -T kernel -C gzip \
3302 -a 0 -e 0 -n "Linux Kernel Image" \
3303 -d linux.bin.gz uImage
wdenk24ee89b2002-11-03 17:56:27 +00003304
wdenk24ee89b2002-11-03 17:56:27 +00003305
wdenk2729af92004-05-03 20:45:30 +00003306The "mkimage" tool can also be used to create ramdisk images for use
3307with U-Boot, either separated from the Linux kernel image, or
3308combined into one file. "mkimage" encapsulates the images with a 64
3309byte header containing information about target architecture,
3310operating system, image type, compression method, entry points, time
3311stamp, CRC32 checksums, etc.
wdenk24ee89b2002-11-03 17:56:27 +00003312
wdenk2729af92004-05-03 20:45:30 +00003313"mkimage" can be called in two ways: to verify existing images and
3314print the header information, or to build new images.
wdenk24ee89b2002-11-03 17:56:27 +00003315
wdenk2729af92004-05-03 20:45:30 +00003316In the first form (with "-l" option) mkimage lists the information
3317contained in the header of an existing U-Boot image; this includes
3318checksum verification:
wdenk24ee89b2002-11-03 17:56:27 +00003319
wdenk2729af92004-05-03 20:45:30 +00003320 tools/mkimage -l image
3321 -l ==> list image header information
wdenk24ee89b2002-11-03 17:56:27 +00003322
wdenk2729af92004-05-03 20:45:30 +00003323The second form (with "-d" option) is used to build a U-Boot image
3324from a "data file" which is used as image payload:
wdenk24ee89b2002-11-03 17:56:27 +00003325
wdenk2729af92004-05-03 20:45:30 +00003326 tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
3327 -n name -d data_file image
3328 -A ==> set architecture to 'arch'
3329 -O ==> set operating system to 'os'
3330 -T ==> set image type to 'type'
3331 -C ==> set compression type 'comp'
3332 -a ==> set load address to 'addr' (hex)
3333 -e ==> set entry point to 'ep' (hex)
3334 -n ==> set image name to 'name'
3335 -d ==> use image data from 'datafile'
wdenk24ee89b2002-11-03 17:56:27 +00003336
wdenk69459792004-05-29 16:53:29 +00003337Right now, all Linux kernels for PowerPC systems use the same load
3338address (0x00000000), but the entry point address depends on the
3339kernel version:
wdenkc6097192002-11-03 00:24:07 +00003340
wdenk2729af92004-05-03 20:45:30 +00003341- 2.2.x kernels have the entry point at 0x0000000C,
3342- 2.3.x and later kernels have the entry point at 0x00000000.
wdenkc6097192002-11-03 00:24:07 +00003343
wdenk2729af92004-05-03 20:45:30 +00003344So a typical call to build a U-Boot image would read:
wdenkc6097192002-11-03 00:24:07 +00003345
wdenk2729af92004-05-03 20:45:30 +00003346 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3347 > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
3348 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz \
3349 > examples/uImage.TQM850L
3350 Image Name: 2.4.4 kernel for TQM850L
3351 Created: Wed Jul 19 02:34:59 2000
3352 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3353 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3354 Load Address: 0x00000000
3355 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003356
wdenk2729af92004-05-03 20:45:30 +00003357To verify the contents of the image (or check for corruption):
wdenkc6097192002-11-03 00:24:07 +00003358
wdenk2729af92004-05-03 20:45:30 +00003359 -> tools/mkimage -l examples/uImage.TQM850L
3360 Image Name: 2.4.4 kernel for TQM850L
3361 Created: Wed Jul 19 02:34:59 2000
3362 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3363 Data Size: 335725 Bytes = 327.86 kB = 0.32 MB
3364 Load Address: 0x00000000
3365 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003366
wdenk2729af92004-05-03 20:45:30 +00003367NOTE: for embedded systems where boot time is critical you can trade
3368speed for memory and install an UNCOMPRESSED image instead: this
3369needs more space in Flash, but boots much faster since it does not
3370need to be uncompressed:
wdenkc6097192002-11-03 00:24:07 +00003371
wdenk2729af92004-05-03 20:45:30 +00003372 -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux.gz
3373 -> tools/mkimage -n '2.4.4 kernel for TQM850L' \
3374 > -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3375 > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/ppc/coffboot/vmlinux \
3376 > examples/uImage.TQM850L-uncompressed
3377 Image Name: 2.4.4 kernel for TQM850L
3378 Created: Wed Jul 19 02:34:59 2000
3379 Image Type: PowerPC Linux Kernel Image (uncompressed)
3380 Data Size: 792160 Bytes = 773.59 kB = 0.76 MB
3381 Load Address: 0x00000000
3382 Entry Point: 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003383
wdenkc6097192002-11-03 00:24:07 +00003384
wdenk2729af92004-05-03 20:45:30 +00003385Similar you can build U-Boot images from a 'ramdisk.image.gz' file
3386when your kernel is intended to use an initial ramdisk:
wdenkdb01a2e2004-04-15 23:14:49 +00003387
wdenk2729af92004-05-03 20:45:30 +00003388 -> tools/mkimage -n 'Simple Ramdisk Image' \
3389 > -A ppc -O linux -T ramdisk -C gzip \
3390 > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3391 Image Name: Simple Ramdisk Image
3392 Created: Wed Jan 12 14:01:50 2000
3393 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3394 Data Size: 566530 Bytes = 553.25 kB = 0.54 MB
3395 Load Address: 0x00000000
3396 Entry Point: 0x00000000
wdenkdb01a2e2004-04-15 23:14:49 +00003397
wdenkdb01a2e2004-04-15 23:14:49 +00003398
wdenk2729af92004-05-03 20:45:30 +00003399Installing a Linux Image:
3400-------------------------
wdenkdb01a2e2004-04-15 23:14:49 +00003401
wdenk2729af92004-05-03 20:45:30 +00003402To downloading a U-Boot image over the serial (console) interface,
3403you must convert the image to S-Record format:
wdenkdb01a2e2004-04-15 23:14:49 +00003404
wdenk2729af92004-05-03 20:45:30 +00003405 objcopy -I binary -O srec examples/image examples/image.srec
wdenkdb01a2e2004-04-15 23:14:49 +00003406
wdenk2729af92004-05-03 20:45:30 +00003407The 'objcopy' does not understand the information in the U-Boot
3408image header, so the resulting S-Record file will be relative to
3409address 0x00000000. To load it to a given address, you need to
3410specify the target address as 'offset' parameter with the 'loads'
3411command.
wdenkc6097192002-11-03 00:24:07 +00003412
wdenk2729af92004-05-03 20:45:30 +00003413Example: install the image to address 0x40100000 (which on the
3414TQM8xxL is in the first Flash bank):
wdenkc6097192002-11-03 00:24:07 +00003415
wdenk2729af92004-05-03 20:45:30 +00003416 => erase 40100000 401FFFFF
wdenkc6097192002-11-03 00:24:07 +00003417
wdenk2729af92004-05-03 20:45:30 +00003418 .......... done
3419 Erased 8 sectors
wdenkc6097192002-11-03 00:24:07 +00003420
wdenk2729af92004-05-03 20:45:30 +00003421 => loads 40100000
3422 ## Ready for S-Record download ...
3423 ~>examples/image.srec
3424 1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3425 ...
3426 15989 15990 15991 15992
3427 [file transfer complete]
3428 [connected]
3429 ## Start Addr = 0x00000000
wdenkc6097192002-11-03 00:24:07 +00003430
3431
wdenk2729af92004-05-03 20:45:30 +00003432You can check the success of the download using the 'iminfo' command;
Wolfgang Denk218ca722008-03-26 10:40:12 +01003433this includes a checksum verification so you can be sure no data
wdenk2729af92004-05-03 20:45:30 +00003434corruption happened:
wdenkc6097192002-11-03 00:24:07 +00003435
wdenk2729af92004-05-03 20:45:30 +00003436 => imi 40100000
wdenkc6097192002-11-03 00:24:07 +00003437
wdenk2729af92004-05-03 20:45:30 +00003438 ## Checking Image at 40100000 ...
3439 Image Name: 2.2.13 for initrd on TQM850L
3440 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3441 Data Size: 335725 Bytes = 327 kB = 0 MB
3442 Load Address: 00000000
3443 Entry Point: 0000000c
3444 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003445
3446
wdenk2729af92004-05-03 20:45:30 +00003447Boot Linux:
3448-----------
wdenkc6097192002-11-03 00:24:07 +00003449
wdenk2729af92004-05-03 20:45:30 +00003450The "bootm" command is used to boot an application that is stored in
3451memory (RAM or Flash). In case of a Linux kernel image, the contents
3452of the "bootargs" environment variable is passed to the kernel as
3453parameters. You can check and modify this variable using the
3454"printenv" and "setenv" commands:
wdenkc6097192002-11-03 00:24:07 +00003455
3456
wdenk2729af92004-05-03 20:45:30 +00003457 => printenv bootargs
3458 bootargs=root=/dev/ram
wdenkc6097192002-11-03 00:24:07 +00003459
wdenk2729af92004-05-03 20:45:30 +00003460 => 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 +00003461
wdenk2729af92004-05-03 20:45:30 +00003462 => printenv bootargs
3463 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 +00003464
wdenk2729af92004-05-03 20:45:30 +00003465 => bootm 40020000
3466 ## Booting Linux kernel at 40020000 ...
3467 Image Name: 2.2.13 for NFS on TQM850L
3468 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3469 Data Size: 381681 Bytes = 372 kB = 0 MB
3470 Load Address: 00000000
3471 Entry Point: 0000000c
3472 Verifying Checksum ... OK
3473 Uncompressing Kernel Image ... OK
3474 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
3475 Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3476 time_init: decrementer frequency = 187500000/60
3477 Calibrating delay loop... 49.77 BogoMIPS
3478 Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3479 ...
wdenkc6097192002-11-03 00:24:07 +00003480
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003481If you want to boot a Linux kernel with initial RAM disk, you pass
wdenk2729af92004-05-03 20:45:30 +00003482the memory addresses of both the kernel and the initrd image (PPBCOOT
3483format!) to the "bootm" command:
wdenkc6097192002-11-03 00:24:07 +00003484
wdenk2729af92004-05-03 20:45:30 +00003485 => imi 40100000 40200000
wdenkc6097192002-11-03 00:24:07 +00003486
wdenk2729af92004-05-03 20:45:30 +00003487 ## Checking Image at 40100000 ...
3488 Image Name: 2.2.13 for initrd on TQM850L
3489 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3490 Data Size: 335725 Bytes = 327 kB = 0 MB
3491 Load Address: 00000000
3492 Entry Point: 0000000c
3493 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003494
wdenk2729af92004-05-03 20:45:30 +00003495 ## Checking Image at 40200000 ...
3496 Image Name: Simple Ramdisk Image
3497 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3498 Data Size: 566530 Bytes = 553 kB = 0 MB
3499 Load Address: 00000000
3500 Entry Point: 00000000
3501 Verifying Checksum ... OK
wdenkc6097192002-11-03 00:24:07 +00003502
wdenk2729af92004-05-03 20:45:30 +00003503 => bootm 40100000 40200000
3504 ## Booting Linux kernel at 40100000 ...
3505 Image Name: 2.2.13 for initrd on TQM850L
3506 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3507 Data Size: 335725 Bytes = 327 kB = 0 MB
3508 Load Address: 00000000
3509 Entry Point: 0000000c
3510 Verifying Checksum ... OK
3511 Uncompressing Kernel Image ... OK
3512 ## Loading RAMDisk Image at 40200000 ...
3513 Image Name: Simple Ramdisk Image
3514 Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
3515 Data Size: 566530 Bytes = 553 kB = 0 MB
3516 Load Address: 00000000
3517 Entry Point: 00000000
3518 Verifying Checksum ... OK
3519 Loading Ramdisk ... OK
3520 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
3521 Boot arguments: root=/dev/ram
3522 time_init: decrementer frequency = 187500000/60
3523 Calibrating delay loop... 49.77 BogoMIPS
3524 ...
3525 RAMDISK: Compressed image found at block 0
3526 VFS: Mounted root (ext2 filesystem).
wdenkc6097192002-11-03 00:24:07 +00003527
wdenk2729af92004-05-03 20:45:30 +00003528 bash#
wdenkc6097192002-11-03 00:24:07 +00003529
Matthew McClintock02677682006-06-28 10:41:37 -05003530Boot Linux and pass a flat device tree:
3531-----------
3532
3533First, U-Boot must be compiled with the appropriate defines. See the section
3534titled "Linux Kernel Interface" above for a more in depth explanation. The
3535following is an example of how to start a kernel and pass an updated
3536flat device tree:
3537
3538=> print oftaddr
3539oftaddr=0x300000
3540=> print oft
3541oft=oftrees/mpc8540ads.dtb
3542=> tftp $oftaddr $oft
3543Speed: 1000, full duplex
3544Using TSEC0 device
3545TFTP from server 192.168.1.1; our IP address is 192.168.1.101
3546Filename 'oftrees/mpc8540ads.dtb'.
3547Load address: 0x300000
3548Loading: #
3549done
3550Bytes transferred = 4106 (100a hex)
3551=> tftp $loadaddr $bootfile
3552Speed: 1000, full duplex
3553Using TSEC0 device
3554TFTP from server 192.168.1.1; our IP address is 192.168.1.2
3555Filename 'uImage'.
3556Load address: 0x200000
3557Loading:############
3558done
3559Bytes transferred = 1029407 (fb51f hex)
3560=> print loadaddr
3561loadaddr=200000
3562=> print oftaddr
3563oftaddr=0x300000
3564=> bootm $loadaddr - $oftaddr
3565## Booting image at 00200000 ...
Wolfgang Denka9398e02006-11-27 15:32:42 +01003566 Image Name: Linux-2.6.17-dirty
3567 Image Type: PowerPC Linux Kernel Image (gzip compressed)
3568 Data Size: 1029343 Bytes = 1005.2 kB
Matthew McClintock02677682006-06-28 10:41:37 -05003569 Load Address: 00000000
Wolfgang Denka9398e02006-11-27 15:32:42 +01003570 Entry Point: 00000000
Matthew McClintock02677682006-06-28 10:41:37 -05003571 Verifying Checksum ... OK
3572 Uncompressing Kernel Image ... OK
3573Booting using flat device tree at 0x300000
3574Using MPC85xx ADS machine description
3575Memory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
3576[snip]
3577
3578
wdenk2729af92004-05-03 20:45:30 +00003579More About U-Boot Image Types:
3580------------------------------
wdenk6069ff22003-02-28 00:49:47 +00003581
wdenk2729af92004-05-03 20:45:30 +00003582U-Boot supports the following image types:
wdenk6069ff22003-02-28 00:49:47 +00003583
wdenk2729af92004-05-03 20:45:30 +00003584 "Standalone Programs" are directly runnable in the environment
3585 provided by U-Boot; it is expected that (if they behave
3586 well) you can continue to work in U-Boot after return from
3587 the Standalone Program.
3588 "OS Kernel Images" are usually images of some Embedded OS which
3589 will take over control completely. Usually these programs
3590 will install their own set of exception handlers, device
3591 drivers, set up the MMU, etc. - this means, that you cannot
3592 expect to re-enter U-Boot except by resetting the CPU.
3593 "RAMDisk Images" are more or less just data blocks, and their
3594 parameters (address, size) are passed to an OS kernel that is
3595 being started.
3596 "Multi-File Images" contain several images, typically an OS
3597 (Linux) kernel image and one or more data images like
3598 RAMDisks. This construct is useful for instance when you want
3599 to boot over the network using BOOTP etc., where the boot
3600 server provides just a single image file, but you want to get
3601 for instance an OS kernel and a RAMDisk image.
stroesec1551ea2003-04-04 15:53:41 +00003602
wdenk2729af92004-05-03 20:45:30 +00003603 "Multi-File Images" start with a list of image sizes, each
3604 image size (in bytes) specified by an "uint32_t" in network
3605 byte order. This list is terminated by an "(uint32_t)0".
3606 Immediately after the terminating 0 follow the images, one by
3607 one, all aligned on "uint32_t" boundaries (size rounded up to
3608 a multiple of 4 bytes).
stroesec1551ea2003-04-04 15:53:41 +00003609
wdenk2729af92004-05-03 20:45:30 +00003610 "Firmware Images" are binary images containing firmware (like
3611 U-Boot or FPGA images) which usually will be programmed to
3612 flash memory.
stroesec1551ea2003-04-04 15:53:41 +00003613
wdenk2729af92004-05-03 20:45:30 +00003614 "Script files" are command sequences that will be executed by
3615 U-Boot's command interpreter; this feature is especially
3616 useful when you configure U-Boot to use a real shell (hush)
3617 as command interpreter.
wdenk6069ff22003-02-28 00:49:47 +00003618
wdenkc6097192002-11-03 00:24:07 +00003619
wdenk2729af92004-05-03 20:45:30 +00003620Standalone HOWTO:
3621=================
wdenkc6097192002-11-03 00:24:07 +00003622
wdenk2729af92004-05-03 20:45:30 +00003623One of the features of U-Boot is that you can dynamically load and
3624run "standalone" applications, which can use some resources of
3625U-Boot like console I/O functions or interrupt services.
wdenkc6097192002-11-03 00:24:07 +00003626
wdenk2729af92004-05-03 20:45:30 +00003627Two simple examples are included with the sources:
wdenkc6097192002-11-03 00:24:07 +00003628
wdenk2729af92004-05-03 20:45:30 +00003629"Hello World" Demo:
3630-------------------
wdenkc6097192002-11-03 00:24:07 +00003631
wdenk2729af92004-05-03 20:45:30 +00003632'examples/hello_world.c' contains a small "Hello World" Demo
3633application; it is automatically compiled when you build U-Boot.
3634It's configured to run at address 0x00040004, so you can play with it
3635like that:
wdenkc6097192002-11-03 00:24:07 +00003636
wdenk2729af92004-05-03 20:45:30 +00003637 => loads
3638 ## Ready for S-Record download ...
3639 ~>examples/hello_world.srec
3640 1 2 3 4 5 6 7 8 9 10 11 ...
3641 [file transfer complete]
3642 [connected]
3643 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003644
wdenk2729af92004-05-03 20:45:30 +00003645 => go 40004 Hello World! This is a test.
3646 ## Starting application at 0x00040004 ...
3647 Hello World
3648 argc = 7
3649 argv[0] = "40004"
3650 argv[1] = "Hello"
3651 argv[2] = "World!"
3652 argv[3] = "This"
3653 argv[4] = "is"
3654 argv[5] = "a"
3655 argv[6] = "test."
3656 argv[7] = "<NULL>"
3657 Hit any key to exit ...
wdenkc6097192002-11-03 00:24:07 +00003658
wdenk2729af92004-05-03 20:45:30 +00003659 ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003660
wdenk2729af92004-05-03 20:45:30 +00003661Another example, which demonstrates how to register a CPM interrupt
3662handler with the U-Boot code, can be found in 'examples/timer.c'.
3663Here, a CPM timer is set up to generate an interrupt every second.
3664The interrupt service routine is trivial, just printing a '.'
3665character, but this is just a demo program. The application can be
3666controlled by the following keys:
wdenkc6097192002-11-03 00:24:07 +00003667
wdenk2729af92004-05-03 20:45:30 +00003668 ? - print current values og the CPM Timer registers
3669 b - enable interrupts and start timer
3670 e - stop timer and disable interrupts
3671 q - quit application
wdenkc6097192002-11-03 00:24:07 +00003672
wdenk2729af92004-05-03 20:45:30 +00003673 => loads
3674 ## Ready for S-Record download ...
3675 ~>examples/timer.srec
3676 1 2 3 4 5 6 7 8 9 10 11 ...
3677 [file transfer complete]
3678 [connected]
3679 ## Start Addr = 0x00040004
wdenkc6097192002-11-03 00:24:07 +00003680
wdenk2729af92004-05-03 20:45:30 +00003681 => go 40004
3682 ## Starting application at 0x00040004 ...
3683 TIMERS=0xfff00980
3684 Using timer 1
3685 tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
wdenkc6097192002-11-03 00:24:07 +00003686
wdenk2729af92004-05-03 20:45:30 +00003687Hit 'b':
3688 [q, b, e, ?] Set interval 1000000 us
3689 Enabling timer
3690Hit '?':
3691 [q, b, e, ?] ........
3692 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
3693Hit '?':
3694 [q, b, e, ?] .
3695 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
3696Hit '?':
3697 [q, b, e, ?] .
3698 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
3699Hit '?':
3700 [q, b, e, ?] .
3701 tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
3702Hit 'e':
3703 [q, b, e, ?] ...Stopping timer
3704Hit 'q':
3705 [q, b, e, ?] ## Application terminated, rc = 0x0
wdenkc6097192002-11-03 00:24:07 +00003706
3707
wdenk2729af92004-05-03 20:45:30 +00003708Minicom warning:
3709================
wdenk85ec0bc2003-03-31 16:34:49 +00003710
wdenk2729af92004-05-03 20:45:30 +00003711Over time, many people have reported problems when trying to use the
3712"minicom" terminal emulation program for serial download. I (wd)
3713consider minicom to be broken, and recommend not to use it. Under
3714Unix, I recommend to use C-Kermit for general purpose use (and
3715especially for kermit binary protocol download ("loadb" command), and
3716use "cu" for S-Record download ("loads" command).
wdenk85ec0bc2003-03-31 16:34:49 +00003717
wdenk2729af92004-05-03 20:45:30 +00003718Nevertheless, if you absolutely want to use it try adding this
3719configuration to your "File transfer protocols" section:
wdenk52f52c12003-06-19 23:04:19 +00003720
wdenk2729af92004-05-03 20:45:30 +00003721 Name Program Name U/D FullScr IO-Red. Multi
3722 X kermit /usr/bin/kermit -i -l %l -s Y U Y N N
3723 Y kermit /usr/bin/kermit -i -l %l -r N D Y N N
wdenk52f52c12003-06-19 23:04:19 +00003724
3725
wdenk2729af92004-05-03 20:45:30 +00003726NetBSD Notes:
3727=============
wdenkc6097192002-11-03 00:24:07 +00003728
wdenk2729af92004-05-03 20:45:30 +00003729Starting at version 0.9.2, U-Boot supports NetBSD both as host
3730(build U-Boot) and target system (boots NetBSD/mpc8xx).
wdenkc6097192002-11-03 00:24:07 +00003731
wdenk2729af92004-05-03 20:45:30 +00003732Building requires a cross environment; it is known to work on
3733NetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
3734need gmake since the Makefiles are not compatible with BSD make).
3735Note that the cross-powerpc package does not install include files;
3736attempting to build U-Boot will fail because <machine/ansi.h> is
3737missing. This file has to be installed and patched manually:
wdenkc6097192002-11-03 00:24:07 +00003738
wdenk2729af92004-05-03 20:45:30 +00003739 # cd /usr/pkg/cross/powerpc-netbsd/include
3740 # mkdir powerpc
3741 # ln -s powerpc machine
3742 # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
3743 # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST
wdenkc6097192002-11-03 00:24:07 +00003744
wdenk2729af92004-05-03 20:45:30 +00003745Native builds *don't* work due to incompatibilities between native
3746and U-Boot include files.
wdenkc6097192002-11-03 00:24:07 +00003747
wdenk2729af92004-05-03 20:45:30 +00003748Booting assumes that (the first part of) the image booted is a
3749stage-2 loader which in turn loads and then invokes the kernel
3750proper. Loader sources will eventually appear in the NetBSD source
3751tree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
wdenk2a8af182005-04-13 10:02:42 +00003752meantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
wdenkc6097192002-11-03 00:24:07 +00003753
3754
wdenk2729af92004-05-03 20:45:30 +00003755Implementation Internals:
3756=========================
wdenkc6097192002-11-03 00:24:07 +00003757
wdenk2729af92004-05-03 20:45:30 +00003758The following is not intended to be a complete description of every
3759implementation detail. However, it should help to understand the
3760inner workings of U-Boot and make it easier to port it to custom
3761hardware.
wdenkc6097192002-11-03 00:24:07 +00003762
3763
wdenk2729af92004-05-03 20:45:30 +00003764Initial Stack, Global Data:
3765---------------------------
wdenkc6097192002-11-03 00:24:07 +00003766
wdenk2729af92004-05-03 20:45:30 +00003767The implementation of U-Boot is complicated by the fact that U-Boot
3768starts running out of ROM (flash memory), usually without access to
3769system RAM (because the memory controller is not initialized yet).
3770This means that we don't have writable Data or BSS segments, and BSS
3771is not initialized as zero. To be able to get a C environment working
3772at all, we have to allocate at least a minimal stack. Implementation
3773options for this are defined and restricted by the CPU used: Some CPU
3774models provide on-chip memory (like the IMMR area on MPC8xx and
3775MPC826x processors), on others (parts of) the data cache can be
3776locked as (mis-) used as memory, etc.
wdenkc6097192002-11-03 00:24:07 +00003777
Wolfgang Denk218ca722008-03-26 10:40:12 +01003778 Chris Hallinan posted a good summary of these issues to the
Wolfgang Denk06682362008-12-30 22:56:11 +01003779 U-Boot mailing list:
wdenk43d96162003-03-06 00:02:04 +00003780
wdenk2729af92004-05-03 20:45:30 +00003781 Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
3782 From: "Chris Hallinan" <clh@net1plus.com>
3783 Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
3784 ...
wdenk43d96162003-03-06 00:02:04 +00003785
wdenk2729af92004-05-03 20:45:30 +00003786 Correct me if I'm wrong, folks, but the way I understand it
3787 is this: Using DCACHE as initial RAM for Stack, etc, does not
3788 require any physical RAM backing up the cache. The cleverness
3789 is that the cache is being used as a temporary supply of
3790 necessary storage before the SDRAM controller is setup. It's
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003791 beyond the scope of this list to explain the details, but you
wdenk2729af92004-05-03 20:45:30 +00003792 can see how this works by studying the cache architecture and
3793 operation in the architecture and processor-specific manuals.
wdenk43d96162003-03-06 00:02:04 +00003794
wdenk2729af92004-05-03 20:45:30 +00003795 OCM is On Chip Memory, which I believe the 405GP has 4K. It
3796 is another option for the system designer to use as an
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003797 initial stack/RAM area prior to SDRAM being available. Either
wdenk2729af92004-05-03 20:45:30 +00003798 option should work for you. Using CS 4 should be fine if your
3799 board designers haven't used it for something that would
3800 cause you grief during the initial boot! It is frequently not
3801 used.
wdenk43d96162003-03-06 00:02:04 +00003802
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003803 CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
wdenk2729af92004-05-03 20:45:30 +00003804 with your processor/board/system design. The default value
3805 you will find in any recent u-boot distribution in
Stefan Roese8a316c92005-08-01 16:49:12 +02003806 walnut.h should work for you. I'd set it to a value larger
wdenk2729af92004-05-03 20:45:30 +00003807 than your SDRAM module. If you have a 64MB SDRAM module, set
3808 it above 400_0000. Just make sure your board has no resources
3809 that are supposed to respond to that address! That code in
3810 start.S has been around a while and should work as is when
3811 you get the config right.
wdenk43d96162003-03-06 00:02:04 +00003812
wdenk2729af92004-05-03 20:45:30 +00003813 -Chris Hallinan
3814 DS4.COM, Inc.
wdenk43d96162003-03-06 00:02:04 +00003815
wdenk2729af92004-05-03 20:45:30 +00003816It is essential to remember this, since it has some impact on the C
3817code for the initialization procedures:
wdenkc6097192002-11-03 00:24:07 +00003818
wdenk2729af92004-05-03 20:45:30 +00003819* Initialized global data (data segment) is read-only. Do not attempt
3820 to write it.
wdenkc6097192002-11-03 00:24:07 +00003821
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003822* Do not use any uninitialized global data (or implicitely initialized
wdenk2729af92004-05-03 20:45:30 +00003823 as zero data - BSS segment) at all - this is undefined, initiali-
3824 zation is performed later (when relocating to RAM).
wdenkc6097192002-11-03 00:24:07 +00003825
wdenk2729af92004-05-03 20:45:30 +00003826* Stack space is very limited. Avoid big data buffers or things like
3827 that.
wdenkc6097192002-11-03 00:24:07 +00003828
wdenk2729af92004-05-03 20:45:30 +00003829Having only the stack as writable memory limits means we cannot use
3830normal global data to share information beween the code. But it
3831turned out that the implementation of U-Boot can be greatly
3832simplified by making a global data structure (gd_t) available to all
3833functions. We could pass a pointer to this data as argument to _all_
3834functions, but this would bloat the code. Instead we use a feature of
3835the GCC compiler (Global Register Variables) to share the data: we
3836place a pointer (gd) to the global data into a register which we
3837reserve for this purpose.
wdenkc6097192002-11-03 00:24:07 +00003838
wdenk2729af92004-05-03 20:45:30 +00003839When choosing a register for such a purpose we are restricted by the
3840relevant (E)ABI specifications for the current architecture, and by
3841GCC's implementation.
wdenkc6097192002-11-03 00:24:07 +00003842
wdenk2729af92004-05-03 20:45:30 +00003843For PowerPC, the following registers have specific use:
3844 R1: stack pointer
Wolfgang Denke7670f62008-02-14 22:43:22 +01003845 R2: reserved for system use
wdenk2729af92004-05-03 20:45:30 +00003846 R3-R4: parameter passing and return values
3847 R5-R10: parameter passing
3848 R13: small data area pointer
3849 R30: GOT pointer
3850 R31: frame pointer
wdenkc6097192002-11-03 00:24:07 +00003851
wdenk2729af92004-05-03 20:45:30 +00003852 (U-Boot also uses R14 as internal GOT pointer.)
wdenkc6097192002-11-03 00:24:07 +00003853
Wolfgang Denke7670f62008-02-14 22:43:22 +01003854 ==> U-Boot will use R2 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003855
wdenk2729af92004-05-03 20:45:30 +00003856 Note: on PPC, we could use a static initializer (since the
3857 address of the global data structure is known at compile time),
3858 but it turned out that reserving a register results in somewhat
3859 smaller code - although the code savings are not that big (on
3860 average for all boards 752 bytes for the whole U-Boot image,
3861 624 text + 127 data).
wdenkc6097192002-11-03 00:24:07 +00003862
Mike Frysinger4c58eb52008-02-04 19:26:54 -05003863On Blackfin, the normal C ABI (except for P5) is followed as documented here:
3864 http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
3865
3866 ==> U-Boot will use P5 to hold a pointer to the global data
3867
wdenk2729af92004-05-03 20:45:30 +00003868On ARM, the following registers are used:
wdenkc6097192002-11-03 00:24:07 +00003869
wdenk2729af92004-05-03 20:45:30 +00003870 R0: function argument word/integer result
3871 R1-R3: function argument word
3872 R9: GOT pointer
3873 R10: stack limit (used only if stack checking if enabled)
3874 R11: argument (frame) pointer
3875 R12: temporary workspace
3876 R13: stack pointer
3877 R14: link register
3878 R15: program counter
wdenkc6097192002-11-03 00:24:07 +00003879
wdenk2729af92004-05-03 20:45:30 +00003880 ==> U-Boot will use R8 to hold a pointer to the global data
wdenkc6097192002-11-03 00:24:07 +00003881
Wolfgang Denkd87080b2006-03-31 18:32:53 +02003882NOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
3883or current versions of GCC may "optimize" the code too much.
wdenkc6097192002-11-03 00:24:07 +00003884
wdenk2729af92004-05-03 20:45:30 +00003885Memory Management:
3886------------------
wdenkc6097192002-11-03 00:24:07 +00003887
wdenk2729af92004-05-03 20:45:30 +00003888U-Boot runs in system state and uses physical addresses, i.e. the
3889MMU is not used either for address mapping nor for memory protection.
wdenkc6097192002-11-03 00:24:07 +00003890
wdenk2729af92004-05-03 20:45:30 +00003891The available memory is mapped to fixed addresses using the memory
3892controller. In this process, a contiguous block is formed for each
3893memory type (Flash, SDRAM, SRAM), even when it consists of several
3894physical memory banks.
wdenkc6097192002-11-03 00:24:07 +00003895
wdenk2729af92004-05-03 20:45:30 +00003896U-Boot is installed in the first 128 kB of the first Flash bank (on
3897TQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
3898booting and sizing and initializing DRAM, the code relocates itself
3899to the upper end of DRAM. Immediately below the U-Boot code some
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +02003900memory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
wdenk2729af92004-05-03 20:45:30 +00003901configuration setting]. Below that, a structure with global Board
3902Info data is placed, followed by the stack (growing downward).
wdenkc6097192002-11-03 00:24:07 +00003903
wdenk2729af92004-05-03 20:45:30 +00003904Additionally, some exception handler code is copied to the low 8 kB
3905of DRAM (0x00000000 ... 0x00001FFF).
wdenkc6097192002-11-03 00:24:07 +00003906
wdenk2729af92004-05-03 20:45:30 +00003907So a typical memory configuration with 16 MB of DRAM could look like
3908this:
wdenkc6097192002-11-03 00:24:07 +00003909
wdenk2729af92004-05-03 20:45:30 +00003910 0x0000 0000 Exception Vector code
3911 :
3912 0x0000 1FFF
3913 0x0000 2000 Free for Application Use
3914 :
3915 :
wdenkc6097192002-11-03 00:24:07 +00003916
wdenk2729af92004-05-03 20:45:30 +00003917 :
3918 :
3919 0x00FB FF20 Monitor Stack (Growing downward)
3920 0x00FB FFAC Board Info Data and permanent copy of global data
3921 0x00FC 0000 Malloc Arena
3922 :
3923 0x00FD FFFF
3924 0x00FE 0000 RAM Copy of Monitor Code
3925 ... eventually: LCD or video framebuffer
3926 ... eventually: pRAM (Protected RAM - unchanged by reset)
3927 0x00FF FFFF [End of RAM]
wdenkc6097192002-11-03 00:24:07 +00003928
3929
wdenk2729af92004-05-03 20:45:30 +00003930System Initialization:
3931----------------------
wdenkc6097192002-11-03 00:24:07 +00003932
wdenk2729af92004-05-03 20:45:30 +00003933In the reset configuration, U-Boot starts at the reset entry point
Marcel Ziswiler11ccc332008-07-09 08:17:15 +02003934(on most PowerPC systems at address 0x00000100). Because of the reset
wdenk2729af92004-05-03 20:45:30 +00003935configuration for CS0# this is a mirror of the onboard Flash memory.
3936To be able to re-map memory U-Boot then jumps to its link address.
3937To be able to implement the initialization code in C, a (small!)
3938initial stack is set up in the internal Dual Ported RAM (in case CPUs
3939which provide such a feature like MPC8xx or MPC8260), or in a locked
3940part of the data cache. After that, U-Boot initializes the CPU core,
3941the caches and the SIU.
wdenkc6097192002-11-03 00:24:07 +00003942
wdenk2729af92004-05-03 20:45:30 +00003943Next, all (potentially) available memory banks are mapped using a
3944preliminary mapping. For example, we put them on 512 MB boundaries
3945(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
3946on 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
3947programmed for SDRAM access. Using the temporary configuration, a
3948simple memory test is run that determines the size of the SDRAM
3949banks.
wdenkc6097192002-11-03 00:24:07 +00003950
wdenk2729af92004-05-03 20:45:30 +00003951When there is more than one SDRAM bank, and the banks are of
3952different size, the largest is mapped first. For equal size, the first
3953bank (CS2#) is mapped first. The first mapping is always for address
39540x00000000, with any additional banks following immediately to create
3955contiguous memory starting from 0.
wdenkc6097192002-11-03 00:24:07 +00003956
wdenk2729af92004-05-03 20:45:30 +00003957Then, the monitor installs itself at the upper end of the SDRAM area
3958and allocates memory for use by malloc() and for the global Board
3959Info data; also, the exception vector code is copied to the low RAM
3960pages, and the final stack is set up.
wdenkc6097192002-11-03 00:24:07 +00003961
wdenk2729af92004-05-03 20:45:30 +00003962Only after this relocation will you have a "normal" C environment;
3963until that you are restricted in several ways, mostly because you are
3964running from ROM, and because the code will have to be relocated to a
3965new address in RAM.
wdenkc6097192002-11-03 00:24:07 +00003966
3967
wdenk2729af92004-05-03 20:45:30 +00003968U-Boot Porting Guide:
3969----------------------
wdenkc6097192002-11-03 00:24:07 +00003970
wdenk2729af92004-05-03 20:45:30 +00003971[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
3972list, October 2002]
wdenkc6097192002-11-03 00:24:07 +00003973
3974
wdenk2729af92004-05-03 20:45:30 +00003975int main (int argc, char *argv[])
3976{
3977 sighandler_t no_more_time;
wdenkc6097192002-11-03 00:24:07 +00003978
wdenk2729af92004-05-03 20:45:30 +00003979 signal (SIGALRM, no_more_time);
3980 alarm (PROJECT_DEADLINE - toSec (3 * WEEK));
wdenkc6097192002-11-03 00:24:07 +00003981
wdenk2729af92004-05-03 20:45:30 +00003982 if (available_money > available_manpower) {
3983 pay consultant to port U-Boot;
wdenkc6097192002-11-03 00:24:07 +00003984 return 0;
3985 }
3986
wdenk2729af92004-05-03 20:45:30 +00003987 Download latest U-Boot source;
3988
Wolfgang Denk06682362008-12-30 22:56:11 +01003989 Subscribe to u-boot mailing list;
wdenk2729af92004-05-03 20:45:30 +00003990
3991 if (clueless) {
3992 email ("Hi, I am new to U-Boot, how do I get started?");
wdenkc6097192002-11-03 00:24:07 +00003993 }
3994
wdenk2729af92004-05-03 20:45:30 +00003995 while (learning) {
3996 Read the README file in the top level directory;
3997 Read http://www.denx.de/twiki/bin/view/DULG/Manual ;
3998 Read the source, Luke;
3999 }
wdenkc6097192002-11-03 00:24:07 +00004000
wdenk2729af92004-05-03 20:45:30 +00004001 if (available_money > toLocalCurrency ($2500)) {
4002 Buy a BDI2000;
4003 } else {
4004 Add a lot of aggravation and time;
4005 }
wdenkc6097192002-11-03 00:24:07 +00004006
wdenk2729af92004-05-03 20:45:30 +00004007 Create your own board support subdirectory;
wdenkc6097192002-11-03 00:24:07 +00004008
wdenk2729af92004-05-03 20:45:30 +00004009 Create your own board config file;
wdenk6aff3112002-12-17 01:51:00 +00004010
wdenk2729af92004-05-03 20:45:30 +00004011 while (!running) {
4012 do {
4013 Add / modify source code;
4014 } until (compiles);
4015 Debug;
4016 if (clueless)
4017 email ("Hi, I am having problems...");
4018 }
4019 Send patch file to Wolfgang;
wdenkc6097192002-11-03 00:24:07 +00004020
wdenk2729af92004-05-03 20:45:30 +00004021 return 0;
4022}
4023
4024void no_more_time (int sig)
4025{
4026 hire_a_guru();
4027}
wdenkc6097192002-11-03 00:24:07 +00004028
4029
wdenk2729af92004-05-03 20:45:30 +00004030Coding Standards:
4031-----------------
wdenkc6097192002-11-03 00:24:07 +00004032
wdenk2729af92004-05-03 20:45:30 +00004033All contributions to U-Boot should conform to the Linux kernel
Detlev Zundel2c051652006-09-01 15:39:02 +02004034coding style; see the file "Documentation/CodingStyle" and the script
4035"scripts/Lindent" in your Linux kernel source directory. In sources
4036originating from U-Boot a style corresponding to "Lindent -pcs" (adding
4037spaces before parameters to function calls) is actually used.
wdenk2729af92004-05-03 20:45:30 +00004038
Detlev Zundel2c051652006-09-01 15:39:02 +02004039Source files originating from a different project (for example the
4040MTD subsystem) are generally exempt from these guidelines and are not
4041reformated to ease subsequent migration to newer versions of those
4042sources.
4043
4044Please note that U-Boot is implemented in C (and to some small parts in
4045Assembler); no C++ is used, so please do not use C++ style comments (//)
4046in your code.
wdenk2729af92004-05-03 20:45:30 +00004047
4048Please also stick to the following formatting rules:
4049- remove any trailing white space
4050- use TAB characters for indentation, not spaces
4051- make sure NOT to use DOS '\r\n' line feeds
4052- do not add more than 2 empty lines to source files
4053- do not add trailing empty lines to source files
4054
4055Submissions which do not conform to the standards may be returned
4056with a request to reformat the changes.
wdenkc6097192002-11-03 00:24:07 +00004057
4058
wdenk2729af92004-05-03 20:45:30 +00004059Submitting Patches:
4060-------------------
wdenkc6097192002-11-03 00:24:07 +00004061
wdenk2729af92004-05-03 20:45:30 +00004062Since the number of patches for U-Boot is growing, we need to
4063establish some rules. Submissions which do not conform to these rules
4064may be rejected, even when they contain important and valuable stuff.
wdenkc6097192002-11-03 00:24:07 +00004065
Magnus Lilja0d28f342008-08-06 19:32:33 +02004066Please see http://www.denx.de/wiki/U-Boot/Patches for details.
Wolfgang Denk218ca722008-03-26 10:40:12 +01004067
Wolfgang Denk06682362008-12-30 22:56:11 +01004068Patches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
4069see http://lists.denx.de/mailman/listinfo/u-boot
4070
wdenk2729af92004-05-03 20:45:30 +00004071When you send a patch, please include the following information with
4072it:
wdenkc6097192002-11-03 00:24:07 +00004073
wdenk2729af92004-05-03 20:45:30 +00004074* For bug fixes: a description of the bug and how your patch fixes
4075 this bug. Please try to include a way of demonstrating that the
4076 patch actually fixes something.
wdenkc6097192002-11-03 00:24:07 +00004077
wdenk2729af92004-05-03 20:45:30 +00004078* For new features: a description of the feature and your
4079 implementation.
wdenkc6097192002-11-03 00:24:07 +00004080
wdenk2729af92004-05-03 20:45:30 +00004081* A CHANGELOG entry as plaintext (separate from the patch)
4082
4083* For major contributions, your entry to the CREDITS file
4084
4085* When you add support for a new board, don't forget to add this
4086 board to the MAKEALL script, too.
4087
4088* If your patch adds new configuration options, don't forget to
4089 document these in the README file.
4090
Wolfgang Denk218ca722008-03-26 10:40:12 +01004091* The patch itself. If you are using git (which is *strongly*
4092 recommended) you can easily generate the patch using the
4093 "git-format-patch". If you then use "git-send-email" to send it to
4094 the U-Boot mailing list, you will avoid most of the common problems
4095 with some other mail clients.
wdenk2729af92004-05-03 20:45:30 +00004096
Wolfgang Denk218ca722008-03-26 10:40:12 +01004097 If you cannot use git, use "diff -purN OLD NEW". If your version of
4098 diff does not support these options, then get the latest version of
4099 GNU diff.
wdenk2729af92004-05-03 20:45:30 +00004100
Wolfgang Denk218ca722008-03-26 10:40:12 +01004101 The current directory when running this command shall be the parent
4102 directory of the U-Boot source tree (i. e. please make sure that
4103 your patch includes sufficient directory information for the
4104 affected files).
4105
4106 We prefer patches as plain text. MIME attachments are discouraged,
4107 and compressed attachments must not be used.
wdenk2729af92004-05-03 20:45:30 +00004108
4109* If one logical set of modifications affects or creates several
4110 files, all these changes shall be submitted in a SINGLE patch file.
4111
4112* Changesets that contain different, unrelated modifications shall be
4113 submitted as SEPARATE patches, one patch per changeset.
4114
4115
4116Notes:
4117
4118* Before sending the patch, run the MAKEALL script on your patched
4119 source tree and make sure that no errors or warnings are reported
4120 for any of the boards.
4121
4122* Keep your modifications to the necessary minimum: A patch
4123 containing several unrelated changes or arbitrary reformats will be
4124 returned with a request to re-formatting / split it.
4125
4126* If you modify existing code, make sure that your new code does not
4127 add to the memory footprint of the code ;-) Small is beautiful!
4128 When adding new features, these should compile conditionally only
4129 (using #ifdef), and the resulting code with the new feature
4130 disabled must not need more memory than the old code without your
4131 modification.
wdenk90dc6702005-05-03 14:12:25 +00004132
Wolfgang Denk06682362008-12-30 22:56:11 +01004133* Remember that there is a size limit of 100 kB per message on the
4134 u-boot mailing list. Bigger patches will be moderated. If they are
4135 reasonable and not too big, they will be acknowledged. But patches
4136 bigger than the size limit should be avoided.