xref: /openbmc/u-boot/README (revision 3d0075fa7ad7357de48ade6ef05089542dd762cf)
1c609719bSwdenk#
2cccfc2abSDetlev Zundel# (C) Copyright 2000 - 2009
3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4c609719bSwdenk#
5c609719bSwdenk# See file CREDITS for list of people who contributed to this
6c609719bSwdenk# project.
7c609719bSwdenk#
8c609719bSwdenk# This program is free software; you can redistribute it and/or
9c609719bSwdenk# modify it under the terms of the GNU General Public License as
10c609719bSwdenk# published by the Free Software Foundation; either version 2 of
11c609719bSwdenk# the License, or (at your option) any later version.
12c609719bSwdenk#
13c609719bSwdenk# This program is distributed in the hope that it will be useful,
14c609719bSwdenk# but WITHOUT ANY WARRANTY; without even the implied warranty of
15c609719bSwdenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
16c609719bSwdenk# GNU General Public License for more details.
17c609719bSwdenk#
18c609719bSwdenk# You should have received a copy of the GNU General Public License
19c609719bSwdenk# along with this program; if not, write to the Free Software
20c609719bSwdenk# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21c609719bSwdenk# MA 02111-1307 USA
22c609719bSwdenk#
23c609719bSwdenk
24c609719bSwdenkSummary:
25c609719bSwdenk========
26c609719bSwdenk
2724ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for
28e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other
29e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to
30e86e5a07Swdenkinitialize and test the hardware or to download and run application
31e86e5a07Swdenkcode.
32c609719bSwdenk
33c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of
3424ee89b9Swdenkthe source code originate in the Linux source tree, we have some
3524ee89b9Swdenkheader files in common, and special provision has been made to
36c609719bSwdenksupport booting of Linux images.
37c609719bSwdenk
38c609719bSwdenkSome attention has been paid to make this software easily
39c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are
40c609719bSwdenkimplemented with the same call interface, so that it's very easy to
41c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used
42c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can
43c609719bSwdenkload and run it dynamically.
44c609719bSwdenk
45c609719bSwdenk
46c609719bSwdenkStatus:
47c609719bSwdenk=======
48c609719bSwdenk
49c609719bSwdenkIn general, all boards for which a configuration option exists in the
50c609719bSwdenkMakefile have been tested to some extent and can be considered
51c609719bSwdenk"working". In fact, many of them are used in production systems.
52c609719bSwdenk
53c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out
54218ca724SWolfgang Denkwho contributed the specific port. The MAINTAINERS file lists board
55218ca724SWolfgang Denkmaintainers.
56c609719bSwdenk
57c609719bSwdenk
58c609719bSwdenkWhere to get help:
59c609719bSwdenk==================
60c609719bSwdenk
61c609719bSwdenkIn case you have questions about, problems with or contributions for
62c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
630c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic
640c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's.
650c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and
660c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot
67c609719bSwdenk
68c609719bSwdenk
69218ca724SWolfgang DenkWhere to get source code:
70218ca724SWolfgang Denk=========================
71218ca724SWolfgang Denk
72218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at
73218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at
74218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
75218ca724SWolfgang Denk
76218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of
7711ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also
78218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/
79218ca724SWolfgang Denkdirectory.
80218ca724SWolfgang Denk
81d4ee711dSAnatolij GustschinPre-built (and tested) images are available from
82218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/
83218ca724SWolfgang Denk
84218ca724SWolfgang Denk
85c609719bSwdenkWhere we come from:
86c609719bSwdenk===================
87c609719bSwdenk
88c609719bSwdenk- start from 8xxrom sources
8924ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
90c609719bSwdenk- clean up code
91c609719bSwdenk- make it easier to add custom boards
92c609719bSwdenk- make it possible to add other [PowerPC] CPUs
93c609719bSwdenk- extend functions, especially:
94c609719bSwdenk  * Provide extended interface to Linux boot loader
95c609719bSwdenk  * S-Record download
96c609719bSwdenk  * network boot
9711ccc33fSMarcel Ziswiler  * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
9824ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
99c609719bSwdenk- add other CPU families (starting with ARM)
10024ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
1010d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot
10224ee89b9Swdenk
10324ee89b9Swdenk
10424ee89b9SwdenkNames and Spelling:
10524ee89b9Swdenk===================
10624ee89b9Swdenk
10724ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
10824ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
10924ee89b9Swdenkin source files etc.). Example:
11024ee89b9Swdenk
11124ee89b9Swdenk	This is the README file for the U-Boot project.
11224ee89b9Swdenk
11324ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
11424ee89b9Swdenk
11524ee89b9Swdenk	include/asm-ppc/u-boot.h
11624ee89b9Swdenk
11724ee89b9Swdenk	#include <asm/u-boot.h>
11824ee89b9Swdenk
11924ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
12024ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
12124ee89b9Swdenk
12224ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
12324ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
124c609719bSwdenk
125c609719bSwdenk
12693f19cc0SwdenkVersioning:
12793f19cc0Swdenk===========
12893f19cc0Swdenk
129360d883aSThomas WeberStarting with the release in October 2008, the names of the releases
130360d883aSThomas Weberwere changed from numerical release numbers without deeper meaning
131360d883aSThomas Weberinto a time stamp based numbering. Regular releases are identified by
132360d883aSThomas Webernames consisting of the calendar year and month of the release date.
133360d883aSThomas WeberAdditional fields (if present) indicate release candidates or bug fix
134360d883aSThomas Weberreleases in "stable" maintenance trees.
13593f19cc0Swdenk
136360d883aSThomas WeberExamples:
137360d883aSThomas Weber	U-Boot v2009.11     - Release November 2009
138360d883aSThomas Weber	U-Boot v2009.11.1   - Release 1 in version November 2009 stable tree
139360d883aSThomas Weber	U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
14093f19cc0Swdenk
14193f19cc0Swdenk
142c609719bSwdenkDirectory Hierarchy:
143c609719bSwdenk====================
144c609719bSwdenk
1458d321b81SPeter Tyser/arch			Architecture specific files
1468d321b81SPeter Tyser  /arm			Files generic to ARM architecture
1478d321b81SPeter Tyser    /cpu		CPU specific files
1488d321b81SPeter Tyser      /arm720t		Files specific to ARM 720 CPUs
1498d321b81SPeter Tyser      /arm920t		Files specific to ARM 920 CPUs
1508d321b81SPeter Tyser	/at91rm9200	Files specific to Atmel AT91RM9200 CPU
1518d321b81SPeter Tyser	/imx		Files specific to Freescale MC9328 i.MX CPUs
1528d321b81SPeter Tyser	/s3c24x0	Files specific to Samsung S3C24X0 CPUs
1538d321b81SPeter Tyser      /arm925t		Files specific to ARM 925 CPUs
1548d321b81SPeter Tyser      /arm926ejs	Files specific to ARM 926 CPUs
1558d321b81SPeter Tyser      /arm1136		Files specific to ARM 1136 CPUs
1568d321b81SPeter Tyser      /ixp		Files specific to Intel XScale IXP CPUs
1578d321b81SPeter Tyser      /pxa		Files specific to Intel XScale PXA CPUs
1588d321b81SPeter Tyser      /s3c44b0		Files specific to Samsung S3C44B0 CPUs
1598d321b81SPeter Tyser      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
1608d321b81SPeter Tyser    /lib		Architecture specific library files
1618d321b81SPeter Tyser  /avr32		Files generic to AVR32 architecture
1628d321b81SPeter Tyser    /cpu		CPU specific files
1638d321b81SPeter Tyser    /lib		Architecture specific library files
1648d321b81SPeter Tyser  /blackfin		Files generic to Analog Devices Blackfin architecture
1658d321b81SPeter Tyser    /cpu		CPU specific files
1668d321b81SPeter Tyser    /lib		Architecture specific library files
1678d321b81SPeter Tyser  /i386			Files generic to i386 architecture
1688d321b81SPeter Tyser    /cpu		CPU specific files
1698d321b81SPeter Tyser    /lib		Architecture specific library files
1708d321b81SPeter Tyser  /m68k			Files generic to m68k architecture
1718d321b81SPeter Tyser    /cpu		CPU specific files
1728d321b81SPeter Tyser      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
1738d321b81SPeter Tyser      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
1748d321b81SPeter Tyser      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
1758d321b81SPeter Tyser      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
1768d321b81SPeter Tyser      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
1778d321b81SPeter Tyser    /lib		Architecture specific library files
1788d321b81SPeter Tyser  /microblaze		Files generic to microblaze architecture
1798d321b81SPeter Tyser    /cpu		CPU specific files
1808d321b81SPeter Tyser    /lib		Architecture specific library files
1818d321b81SPeter Tyser  /mips			Files generic to MIPS architecture
1828d321b81SPeter Tyser    /cpu		CPU specific files
1838d321b81SPeter Tyser    /lib		Architecture specific library files
1848d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1858d321b81SPeter Tyser    /cpu		CPU specific files
1868d321b81SPeter Tyser    /lib		Architecture specific library files
187a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1888d321b81SPeter Tyser    /cpu		CPU specific files
1898d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
1908d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
1918d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
1928d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
1938d321b81SPeter Tyser      /mpc8220		Files specific to Freescale MPC8220 CPUs
1948d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
1958d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
1968d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
1978d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
1988d321b81SPeter Tyser    /lib		Architecture specific library files
1998d321b81SPeter Tyser  /sh			Files generic to SH architecture
2008d321b81SPeter Tyser    /cpu		CPU specific files
2018d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
2028d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
2038d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
2048d321b81SPeter Tyser    /lib		Architecture specific library files
2058d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
2068d321b81SPeter Tyser    /cpu		CPU specific files
2078d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2088d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2098d321b81SPeter Tyser    /lib		Architecture specific library files
2108d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2118d321b81SPeter Tyser/board			Board dependent files
2128d321b81SPeter Tyser/common			Misc architecture independent functions
2138d321b81SPeter Tyser/disk			Code for disk drive partition handling
2148d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2158d321b81SPeter Tyser/drivers		Commonly used device drivers
2168d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2178d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2188d321b81SPeter Tyser/include		Header Files
2198d321b81SPeter Tyser/lib			Files generic to all architectures
2208d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2218d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2228d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2238d321b81SPeter Tyser/net			Networking code
2248d321b81SPeter Tyser/post			Power On Self Test
2258d321b81SPeter Tyser/rtc			Real Time Clock drivers
2268d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
227c609719bSwdenk
228c609719bSwdenkSoftware Configuration:
229c609719bSwdenk=======================
230c609719bSwdenk
231c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
232c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
233c609719bSwdenk
234c609719bSwdenkThere are two classes of configuration variables:
235c609719bSwdenk
236c609719bSwdenk* Configuration _OPTIONS_:
237c609719bSwdenk  These are selectable by the user and have names beginning with
238c609719bSwdenk  "CONFIG_".
239c609719bSwdenk
240c609719bSwdenk* Configuration _SETTINGS_:
241c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
242c609719bSwdenk  you don't know what you're doing; they have names beginning with
2436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
244c609719bSwdenk
245c609719bSwdenkLater we will add a configuration tool - probably similar to or even
246c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
247c609719bSwdenkdo the configuration by hand, which means creating some symbolic
248c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
249c609719bSwdenkas an example here.
250c609719bSwdenk
251c609719bSwdenk
252c609719bSwdenkSelection of Processor Architecture and Board Type:
253c609719bSwdenk---------------------------------------------------
254c609719bSwdenk
255c609719bSwdenkFor all supported boards there are ready-to-use default
256c609719bSwdenkconfigurations available; just type "make <board_name>_config".
257c609719bSwdenk
258c609719bSwdenkExample: For a TQM823L module type:
259c609719bSwdenk
260c609719bSwdenk	cd u-boot
261c609719bSwdenk	make TQM823L_config
262c609719bSwdenk
26311ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
264c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
265c609719bSwdenkdirectory according to the instructions in cogent/README.
266c609719bSwdenk
267c609719bSwdenk
268c609719bSwdenkConfiguration Options:
269c609719bSwdenk----------------------
270c609719bSwdenk
271c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
272c609719bSwdenksuch information is kept in a configuration file
273c609719bSwdenk"include/configs/<board_name>.h".
274c609719bSwdenk
275c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
276c609719bSwdenk"include/configs/TQM823L.h".
277c609719bSwdenk
278c609719bSwdenk
2797f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2807f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2817f6c2cbcSwdenkbuild a config tool - later.
2827f6c2cbcSwdenk
2837f6c2cbcSwdenk
284c609719bSwdenkThe following options need to be configured:
285c609719bSwdenk
2862628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
287c609719bSwdenk
2882628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2896ccec449SWolfgang Denk
2906ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
29109ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
292c609719bSwdenk
293c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
294c609719bSwdenk		Define exactly one of
295c609719bSwdenk		CONFIG_CMA286_60_OLD
296c609719bSwdenk--- FIXME --- not tested yet:
297c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
298c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
299c609719bSwdenk
300c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
301c609719bSwdenk		Define exactly one of
302c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
303c609719bSwdenk
304c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
305c609719bSwdenk		Define one or more of
306c609719bSwdenk		CONFIG_CMA302
307c609719bSwdenk
308c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
309c609719bSwdenk		Define one or more of
310c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
31111ccc33fSMarcel Ziswiler					  the LCD display every second with
312c609719bSwdenk					  a "rotator" |\-/|\-/
313c609719bSwdenk
3142535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3152535d602Swdenk		CONFIG_ADSTYPE
3162535d602Swdenk		Possible values are:
3176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3212535d602Swdenk
322c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
323c609719bSwdenk		Define exactly one of
324c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
325c609719bSwdenk
32611ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
32766ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
32866ca92a5Swdenk					  get_gclk_freq() cannot work
3295da627a4Swdenk					  e.g. if there is no 32KHz
3305da627a4Swdenk					  reference PIT/RTC clock
33166ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
33266ca92a5Swdenk					  or XTAL/EXTAL)
333c609719bSwdenk
33466ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
33766ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
33875d1ea7fSwdenk			See doc/README.MPC866
33975d1ea7fSwdenk
3406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
34175d1ea7fSwdenk
34275d1ea7fSwdenk		Define this to measure the actual CPU clock instead
34375d1ea7fSwdenk		of relying on the correctness of the configured
34475d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
34575d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
34675d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
34875d1ea7fSwdenk
349506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
350506f3918SHeiko Schocher
351506f3918SHeiko Schocher		Define this option if you want to enable the
352506f3918SHeiko Schocher		ICache only when Code runs from RAM.
353506f3918SHeiko Schocher
3540b953ffcSMarkus Klotzbuecher- Intel Monahans options:
3556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
3560b953ffcSMarkus Klotzbuecher
3570b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
3580b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
3590b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
3600b953ffcSMarkus Klotzbuecher
3616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
3620b953ffcSMarkus Klotzbuecher
3630b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
3640b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
3650b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
3660b953ffcSMarkus Klotzbuecher		by this value.
3670b953ffcSMarkus Klotzbuecher
3685da627a4Swdenk- Linux Kernel Interface:
369c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
370c609719bSwdenk
371c609719bSwdenk		U-Boot stores all clock information in Hz
372c609719bSwdenk		internally. For binary compatibility with older Linux
373c609719bSwdenk		kernels (which expect the clocks passed in the
374c609719bSwdenk		bd_info data to be in MHz) the environment variable
375c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
376c609719bSwdenk		converts clock data to MHZ before passing it to the
377c609719bSwdenk		Linux kernel.
378c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
379c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
380c609719bSwdenk		default environment.
381c609719bSwdenk
3825da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
3835da627a4Swdenk
38411ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
3855da627a4Swdenk		expect it to be in bytes, others in MB.
3865da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
3875da627a4Swdenk
388fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
389f57f70aaSWolfgang Denk
390f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
391213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
392213bf8c8SGerald Van Baren		concepts).
393213bf8c8SGerald Van Baren
394213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
395213bf8c8SGerald Van Baren		 * New libfdt-based support
396213bf8c8SGerald Van Baren		 * Adds the "fdt" command
3973bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
398213bf8c8SGerald Van Baren
399b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
400b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
401b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
402b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
403f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
404c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
405f57f70aaSWolfgang Denk
40611ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
40711ccc33fSMarcel Ziswiler		addresses
4083bb342fcSKim Phillips
4094e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
4104e253137SKumar Gala
4114e253137SKumar Gala		Board code has addition modification that it wants to make
4124e253137SKumar Gala		to the flat device tree before handing it off to the kernel
4136705d81eSwdenk
4140267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
4150267768eSMatthew McClintock
41611ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
4170267768eSMatthew McClintock		param header, the default value is zero if undefined.
4180267768eSMatthew McClintock
4193887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
4203887c3fbSHeiko Schocher
4213887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
4223887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
4233887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
4243887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
4253887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
4263887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
4273887c3fbSHeiko Schocher
4280b2f4ecaSNiklaus Giger- vxWorks boot parameters:
4290b2f4ecaSNiklaus Giger
4300b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
4310b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
4320b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
4330b2f4ecaSNiklaus Giger
4340b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
4350b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
4360b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
4370b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
4380b2f4ecaSNiklaus Giger
4390b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
4400b2f4ecaSNiklaus Giger
4410b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
4420b2f4ecaSNiklaus Giger
4430b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
4440b2f4ecaSNiklaus Giger		the defaults discussed just above.
4450b2f4ecaSNiklaus Giger
4466705d81eSwdenk- Serial Ports:
44748d0192fSAndreas Engel		CONFIG_PL010_SERIAL
4486705d81eSwdenk
4496705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
4506705d81eSwdenk
45148d0192fSAndreas Engel		CONFIG_PL011_SERIAL
4526705d81eSwdenk
4536705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
4546705d81eSwdenk
4556705d81eSwdenk		CONFIG_PL011_CLOCK
4566705d81eSwdenk
4576705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
4586705d81eSwdenk		the clock speed of the UARTs.
4596705d81eSwdenk
4606705d81eSwdenk		CONFIG_PL01x_PORTS
4616705d81eSwdenk
4626705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
4636705d81eSwdenk		define this to a list of base addresses for each (supported)
4646705d81eSwdenk		port. See e.g. include/configs/versatile.h
4656705d81eSwdenk
4666705d81eSwdenk
467c609719bSwdenk- Console Interface:
468c609719bSwdenk		Depending on board, define exactly one serial port
469c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
470c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
471c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
472c609719bSwdenk
473c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
474c609719bSwdenk		port routines must be defined elsewhere
475c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
476c609719bSwdenk
477c609719bSwdenk		CONFIG_CFB_CONSOLE
478c609719bSwdenk		Enables console device for a color framebuffer. Needs following
479c609719bSwdenk		defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
480c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
481c609719bSwdenk						(default big endian)
482c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
483c609719bSwdenk						rectangle fill
484c609719bSwdenk						(cf. smiLynxEM)
485c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
486c609719bSwdenk						bit-blit (cf. smiLynxEM)
487c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
488c609719bSwdenk						(cols=pitch)
489c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
490c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
491c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
492c609719bSwdenk						(0-5, cf. cfb_console.c)
493c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
494c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
495c609719bSwdenk						(i.e. i8042_kbd_init())
496c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
497c609719bSwdenk						(i.e. i8042_tstc)
498c609719bSwdenk			VIDEO_GETC_FCT		get char fct
499c609719bSwdenk						(i.e. i8042_getc)
500c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
501c609719bSwdenk						(requires blink timer
502c609719bSwdenk						cf. i8042.c)
5036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
504c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
505c609719bSwdenk						upper right corner
506602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
507c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
508c609719bSwdenk						upper left corner
509a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
510a6c7ad2fSwdenk						linux_logo.h for logo.
511a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
512c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
51311ccc33fSMarcel Ziswiler						additional board info beside
514c609719bSwdenk						the logo
515c609719bSwdenk
516c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
517c609719bSwdenk		default i/o. Serial console can be forced with
518c609719bSwdenk		environment 'console=serial'.
519c609719bSwdenk
520a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
521a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
522a3ad8e26Swdenk		the "silent" environment variable. See
523a3ad8e26Swdenk		doc/README.silent for more information.
524a3ad8e26Swdenk
525c609719bSwdenk- Console Baudrate:
526c609719bSwdenk		CONFIG_BAUDRATE - in bps
527c609719bSwdenk		Select one of the baudrates listed in
5286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
5296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
530c609719bSwdenk
531c92fac91SHeiko Schocher- Console Rx buffer length
532c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
533c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
5342b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
535c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
536c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
537c92fac91SHeiko Schocher		the SMC.
538c92fac91SHeiko Schocher
539c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
540c609719bSwdenk		Delay before automatically booting the default image;
541c609719bSwdenk		set to -1 to disable autoboot.
542c609719bSwdenk
543c609719bSwdenk		See doc/README.autoboot for these options that
544c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
545c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
546c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
547c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
548c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
549c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
550c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
551c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
552c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
553c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
554c609719bSwdenk		CONFIG_RESET_TO_RETRY
555c609719bSwdenk
556c609719bSwdenk- Autoboot Command:
557c609719bSwdenk		CONFIG_BOOTCOMMAND
558c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
559c609719bSwdenk		define a command string that is automatically executed
560c609719bSwdenk		when no character is read on the console interface
561c609719bSwdenk		within "Boot Delay" after reset.
562c609719bSwdenk
563c609719bSwdenk		CONFIG_BOOTARGS
564c609719bSwdenk		This can be used to pass arguments to the bootm
565c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
566c609719bSwdenk		environment value "bootargs".
567c609719bSwdenk
568c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
569c609719bSwdenk		The value of these goes into the environment as
570c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
571c609719bSwdenk		as a convenience, when switching between booting from
57211ccc33fSMarcel Ziswiler		RAM and NFS.
573c609719bSwdenk
574c609719bSwdenk- Pre-Boot Commands:
575c609719bSwdenk		CONFIG_PREBOOT
576c609719bSwdenk
577c609719bSwdenk		When this option is #defined, the existence of the
578c609719bSwdenk		environment variable "preboot" will be checked
579c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
580c609719bSwdenk		countdown and/or running the auto-boot command resp.
581c609719bSwdenk		entering interactive mode.
582c609719bSwdenk
583c609719bSwdenk		This feature is especially useful when "preboot" is
584c609719bSwdenk		automatically generated or modified. For an example
585c609719bSwdenk		see the LWMON board specific code: here "preboot" is
586c609719bSwdenk		modified when the user holds down a certain
587c609719bSwdenk		combination of keys on the (special) keyboard when
588c609719bSwdenk		booting the systems
589c609719bSwdenk
590c609719bSwdenk- Serial Download Echo Mode:
591c609719bSwdenk		CONFIG_LOADS_ECHO
592c609719bSwdenk		If defined to 1, all characters received during a
593c609719bSwdenk		serial download (using the "loads" command) are
594c609719bSwdenk		echoed back. This might be needed by some terminal
595c609719bSwdenk		emulations (like "cu"), but may as well just take
596c609719bSwdenk		time on others. This setting #define's the initial
597c609719bSwdenk		value of the "loads_echo" environment variable.
598c609719bSwdenk
599602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
600c609719bSwdenk		CONFIG_KGDB_BAUDRATE
601c609719bSwdenk		Select one of the baudrates listed in
6026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
603c609719bSwdenk
604c609719bSwdenk- Monitor Functions:
605602ad3b3SJon Loeliger		Monitor commands can be included or excluded
606602ad3b3SJon Loeliger		from the build by using the #include files
607602ad3b3SJon Loeliger		"config_cmd_all.h" and #undef'ing unwanted
608602ad3b3SJon Loeliger		commands, or using "config_cmd_default.h"
609602ad3b3SJon Loeliger		and augmenting with additional #define's
610602ad3b3SJon Loeliger		for wanted commands.
611c609719bSwdenk
612602ad3b3SJon Loeliger		The default command configuration includes all commands
613602ad3b3SJon Loeliger		except those marked below with a "*".
614602ad3b3SJon Loeliger
615602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
616602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
617602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
618602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
619602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
620602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
621602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
622602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
623602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
624602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
625602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
626a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
627a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
628a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
629a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
630602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
631602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
632246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
633602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
634602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
635bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
636602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
637602ad3b3SJon Loeliger		CONFIG_CMD_FAT		* FAT partition support
638602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
639602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
640602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
641602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
642602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
643602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
644602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
645602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
646602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
647602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
648602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
649602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
650602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
651602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
652602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
65302c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
65402c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
655602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
65656523f12Swdenk					  loop, loopw, mtest
657602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
658602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
659602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
66068d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
661602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
662602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
663e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
664e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO	* PCA953x I2C gpio info command
665602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
666602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
667602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
668602ad3b3SJon Loeliger					  host
669602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
670602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
671602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
672602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
673602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
674602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
675602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
676602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
677602ad3b3SJon Loeliger					  (4xx only)
678c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
67902c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
68074de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
681602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
682602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
683602ad3b3SJon Loeliger		CONFIG_CMD_VFD		* VFD support (TRAB)
684602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
685602ad3b3SJon Loeliger		CONFIG_CMD_FSL		* Microblaze FSL support
686c609719bSwdenk
687c609719bSwdenk
688c609719bSwdenk		EXAMPLE: If you want all functions except of network
689c609719bSwdenk		support you can write:
690c609719bSwdenk
691602ad3b3SJon Loeliger		#include "config_cmd_all.h"
692602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
693c609719bSwdenk
694213bf8c8SGerald Van Baren	Other Commands:
695213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
696c609719bSwdenk
697c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
698602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
699c609719bSwdenk		what you (and your U-Boot users) are doing. Data
700c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
701c609719bSwdenk		8260 (where accesses to the IMMR region must be
702c609719bSwdenk		uncached), and it cannot be disabled on all other
703c609719bSwdenk		systems where we (mis-) use the data cache to hold an
704c609719bSwdenk		initial stack and some data.
705c609719bSwdenk
706c609719bSwdenk
707c609719bSwdenk		XXX - this list needs to get updated!
708c609719bSwdenk
709c609719bSwdenk- Watchdog:
710c609719bSwdenk		CONFIG_WATCHDOG
711c609719bSwdenk		If this variable is defined, it enables watchdog
7127152b1d0Swdenk		support. There must be support in the platform specific
713c609719bSwdenk		code for a watchdog. For the 8xx and 8260 CPUs, the
714c609719bSwdenk		SIU Watchdog feature is enabled in the SYPCR
715c609719bSwdenk		register.
716c609719bSwdenk
717c1551ea8Sstroese- U-Boot Version:
718c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
719c1551ea8Sstroese		If this variable is defined, an environment variable
720c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
721c1551ea8Sstroese		version as printed by the "version" command.
722c1551ea8Sstroese		This variable is readonly.
723c1551ea8Sstroese
724c609719bSwdenk- Real-Time Clock:
725c609719bSwdenk
726602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
727c609719bSwdenk		has to be selected, too. Define exactly one of the
728c609719bSwdenk		following options:
729c609719bSwdenk
730c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
731c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
7327ce63709SGuennadi Liakhovetski		CONFIG_RTC_MC13783	- use MC13783 RTC
733c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
7341cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
735c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
7367f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
7373bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
7389536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
7394c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
7406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
741c609719bSwdenk
742b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
743b37c7e5eSwdenk		must also be configured. See I2C Support, below.
744b37c7e5eSwdenk
745e92739d3SPeter Tyser- GPIO Support:
746e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
747e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
748e92739d3SPeter Tyser
7495dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
7505dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
7515dec49caSChris Packham		pins supported by a particular chip.
7525dec49caSChris Packham
753e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
754e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
755e92739d3SPeter Tyser
756c609719bSwdenk- Timestamp Support:
757c609719bSwdenk
758c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
759c609719bSwdenk		(date and time) of an image is printed by image
760c609719bSwdenk		commands like bootm or iminfo. This option is
761602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
762c609719bSwdenk
763c609719bSwdenk- Partition Support:
764c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
76507f3d789Srichardretanubun		and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
766c609719bSwdenk
767602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
768218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
769218ca724SWolfgang Denk		least one partition type as well.
770c609719bSwdenk
771c609719bSwdenk- IDE Reset method:
7724d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
7734d13cbadSwdenk		board configurations files but used nowhere!
774c609719bSwdenk
7754d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
7764d13cbadSwdenk		be performed by calling the function
7774d13cbadSwdenk			ide_set_reset(int reset)
7784d13cbadSwdenk		which has to be defined in a board specific file
779c609719bSwdenk
780c609719bSwdenk- ATAPI Support:
781c609719bSwdenk		CONFIG_ATAPI
782c609719bSwdenk
783c609719bSwdenk		Set this to enable ATAPI support.
784c609719bSwdenk
785c40b2956Swdenk- LBA48 Support
786c40b2956Swdenk		CONFIG_LBA48
787c40b2956Swdenk
788c40b2956Swdenk		Set this to enable support for disks larger than 137GB
7894b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
790c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
791c40b2956Swdenk		support disks up to 2.1TB.
792c40b2956Swdenk
7936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
794c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
795c40b2956Swdenk			Default is 32bit.
796c40b2956Swdenk
797c609719bSwdenk- SCSI Support:
798c609719bSwdenk		At the moment only there is only support for the
799c609719bSwdenk		SYM53C8XX SCSI controller; define
800c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
801c609719bSwdenk
8026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
8036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
8046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
805c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
806c609719bSwdenk		devices.
8076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
808c609719bSwdenk
809c609719bSwdenk- NETWORK Support (PCI):
810682011ffSwdenk		CONFIG_E1000
811682011ffSwdenk		Support for Intel 8254x gigabit chips.
812682011ffSwdenk
813ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
81411ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
815ac3315c2SAndre Schwarz
816c609719bSwdenk		CONFIG_EEPRO100
817c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
81811ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
819c609719bSwdenk		write routine for first time initialisation.
820c609719bSwdenk
821c609719bSwdenk		CONFIG_TULIP
822c609719bSwdenk		Support for Digital 2114x chips.
823c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
824c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
825c609719bSwdenk
826c609719bSwdenk		CONFIG_NATSEMI
827c609719bSwdenk		Support for National dp83815 chips.
828c609719bSwdenk
829c609719bSwdenk		CONFIG_NS8382X
830c609719bSwdenk		Support for National dp8382[01] gigabit chips.
831c609719bSwdenk
83245219c46Swdenk- NETWORK Support (other):
83345219c46Swdenk
834c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
835c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
836c041e9d2SJens Scharsig
837c041e9d2SJens Scharsig			CONFIG_RMII
838c041e9d2SJens Scharsig			Define this to use reduced MII inteface
839c041e9d2SJens Scharsig
840c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
841c041e9d2SJens Scharsig			If this defined, the driver is quiet.
842c041e9d2SJens Scharsig			The driver doen't show link status messages.
843c041e9d2SJens Scharsig
84445219c46Swdenk		CONFIG_DRIVER_LAN91C96
84545219c46Swdenk		Support for SMSC's LAN91C96 chips.
84645219c46Swdenk
84745219c46Swdenk			CONFIG_LAN91C96_BASE
84845219c46Swdenk			Define this to hold the physical address
84945219c46Swdenk			of the LAN91C96's I/O space
85045219c46Swdenk
85145219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
85245219c46Swdenk			Define this to enable 32 bit addressing
85345219c46Swdenk
854f39748aeSwdenk		CONFIG_DRIVER_SMC91111
855f39748aeSwdenk		Support for SMSC's LAN91C111 chip
856f39748aeSwdenk
857f39748aeSwdenk			CONFIG_SMC91111_BASE
858f39748aeSwdenk			Define this to hold the physical address
859f39748aeSwdenk			of the device (I/O space)
860f39748aeSwdenk
861f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
862f39748aeSwdenk			Define this if data bus is 32 bits
863f39748aeSwdenk
864f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
865f39748aeSwdenk			Define this to use i/o functions instead of macros
866f39748aeSwdenk			(some hardware wont work with macros)
867f39748aeSwdenk
868b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
869b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
870b3dbf4a5SMacpaul Lin
871b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
872b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
873b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
874b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
875b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
876b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
877b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
878b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
879b3dbf4a5SMacpaul Lin
880c2fff331SMike Rapoport		CONFIG_SMC911X
881557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
882557b377dSJens Gehrlein
883c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
884557b377dSJens Gehrlein			Define this to hold the physical address
885557b377dSJens Gehrlein			of the device (I/O space)
886557b377dSJens Gehrlein
887c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
888557b377dSJens Gehrlein			Define this if data bus is 32 bits
889557b377dSJens Gehrlein
890c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
891557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
892557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
893c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
894557b377dSJens Gehrlein
895*3d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
896*3d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
897*3d0075faSYoshihiro Shimoda
898*3d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
899*3d0075faSYoshihiro Shimoda			Define the number of ports to be used
900*3d0075faSYoshihiro Shimoda
901*3d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
902*3d0075faSYoshihiro Shimoda			Define the ETH PHY's address
903*3d0075faSYoshihiro Shimoda
904c609719bSwdenk- USB Support:
905c609719bSwdenk		At the moment only the UHCI host controller is
9064d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
907c609719bSwdenk		CONFIG_USB_UHCI to enable it.
908c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
90930d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
910c609719bSwdenk		storage devices.
911c609719bSwdenk		Note:
912c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
913c609719bSwdenk		(TEAC FD-05PUB).
9144d13cbadSwdenk		MPC5200 USB requires additional defines:
9154d13cbadSwdenk			CONFIG_USB_CLOCK
9164d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
917307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
918307ecb6dSEric Millbrandt				for USB on PSC3
9194d13cbadSwdenk			CONFIG_USB_CONFIG
9204d13cbadSwdenk				for differential drivers: 0x00001000
9214d13cbadSwdenk				for single ended drivers: 0x00005000
922307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
923307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
9246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
925fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
926fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
9274d13cbadSwdenk
92816c8d5e7SWolfgang Denk- USB Device:
92916c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
93016c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
93116c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
93211ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
93316c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
93416c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
93516c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
93616c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
93716c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
93816c8d5e7SWolfgang Denk		a Linux host by
93916c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
94016c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
94116c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
94216c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
94316c8d5e7SWolfgang Denk
94416c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
94516c8d5e7SWolfgang Denk			Define this to build a UDC device
94616c8d5e7SWolfgang Denk
94716c8d5e7SWolfgang Denk			CONFIG_USB_TTY
94816c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
94916c8d5e7SWolfgang Denk			talk to the UDC device
95016c8d5e7SWolfgang Denk
9516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
95216c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
95316c8d5e7SWolfgang Denk			be set to usbtty.
95416c8d5e7SWolfgang Denk
95516c8d5e7SWolfgang Denk			mpc8xx:
9566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
95716c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
9586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
95916c8d5e7SWolfgang Denk
9606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
96116c8d5e7SWolfgang Denk				Derive USB clock from brgclk
9626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
96316c8d5e7SWolfgang Denk
96416c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
96516c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
96616c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
96716c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
96816c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
96916c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
97016c8d5e7SWolfgang Denk
97116c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
97216c8d5e7SWolfgang Denk			Define this string as the name of your company for
97316c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
97416c8d5e7SWolfgang Denk
97516c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
97616c8d5e7SWolfgang Denk			Define this string as the name of your product
97716c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
97816c8d5e7SWolfgang Denk
97916c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
98016c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
98116c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
98216c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
98316c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
98416c8d5e7SWolfgang Denk
98516c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
98616c8d5e7SWolfgang Denk			Define this as the unique Product ID
98716c8d5e7SWolfgang Denk			for your device
98816c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
989c609719bSwdenk
990c609719bSwdenk
991c609719bSwdenk- MMC Support:
992c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
993c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
994c609719bSwdenk		accessed from the boot prompt by mapping the device
995c609719bSwdenk		to physical memory similar to flash. Command line is
996602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
997602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
998c609719bSwdenk
9996705d81eSwdenk- Journaling Flash filesystem support:
10006705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
10016705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
10026705d81eSwdenk		Define these for a default partition on a NAND device
10036705d81eSwdenk
10046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
10056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
10066705d81eSwdenk		Define these for a default partition on a NOR device
10076705d81eSwdenk
10086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
10096705d81eSwdenk		Define this to create an own partition. You have to provide a
10106705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
10116705d81eSwdenk
10126705d81eSwdenk		If you define only one JFFS2 partition you may also want to
10136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
10146705d81eSwdenk		to disable the command chpart. This is the default when you
10156705d81eSwdenk		have not defined a custom partition
10166705d81eSwdenk
1017c609719bSwdenk- Keyboard Support:
1018c609719bSwdenk		CONFIG_ISA_KEYBOARD
1019c609719bSwdenk
1020c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1021c609719bSwdenk		support
1022c609719bSwdenk
1023c609719bSwdenk		CONFIG_I8042_KBD
1024c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1025c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1026c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1027c609719bSwdenk		for cfb_console. Supports cursor blinking.
1028c609719bSwdenk
1029c609719bSwdenk- Video support:
1030c609719bSwdenk		CONFIG_VIDEO
1031c609719bSwdenk
1032c609719bSwdenk		Define this to enable video support (for output to
1033c609719bSwdenk		video).
1034c609719bSwdenk
1035c609719bSwdenk		CONFIG_VIDEO_CT69000
1036c609719bSwdenk
1037c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1038c609719bSwdenk
1039c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1040eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1041eeb1b77bSwdenk		video output is selected via environment 'videoout'
1042eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1043eeb1b77bSwdenk		assumed.
1044c609719bSwdenk
1045eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
104611ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1047eeb1b77bSwdenk		are possible:
1048eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1049eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1050eeb1b77bSwdenk
1051eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1052eeb1b77bSwdenk		-------------+---------------------------------------------
1053eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1054eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1055eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1056eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1057eeb1b77bSwdenk		-------------+---------------------------------------------
1058c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1059c609719bSwdenk
1060eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
10617817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1062eeb1b77bSwdenk
1063eeb1b77bSwdenk
1064a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1065a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1066a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1067a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1068a6c7ad2fSwdenk
1069682011ffSwdenk- Keyboard Support:
1070682011ffSwdenk		CONFIG_KEYBOARD
1071682011ffSwdenk
1072682011ffSwdenk		Define this to enable a custom keyboard support.
1073682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1074682011ffSwdenk		defined in your board-specific files.
1075682011ffSwdenk		The only board using this so far is RBC823.
1076a6c7ad2fSwdenk
1077c609719bSwdenk- LCD Support:	CONFIG_LCD
1078c609719bSwdenk
1079c609719bSwdenk		Define this to enable LCD support (for output to LCD
1080c609719bSwdenk		display); also select one of the supported displays
1081c609719bSwdenk		by defining one of these:
1082c609719bSwdenk
108339cf4804SStelian Pop		CONFIG_ATMEL_LCD:
108439cf4804SStelian Pop
108539cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
108639cf4804SStelian Pop
1087fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1088c609719bSwdenk
1089fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1090c609719bSwdenk
1091fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1092c609719bSwdenk
1093fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1094fd3103bbSwdenk			Active, color, single scan.
1095fd3103bbSwdenk
1096fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1097fd3103bbSwdenk
1098fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1099c609719bSwdenk			Active, color, single scan.
1100c609719bSwdenk
1101c609719bSwdenk		CONFIG_SHARP_16x9
1102c609719bSwdenk
1103c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1104c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1105c609719bSwdenk
1106c609719bSwdenk		CONFIG_SHARP_LQ64D341
1107c609719bSwdenk
1108c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1109c609719bSwdenk			Active, color, single scan.
1110c609719bSwdenk
1111c609719bSwdenk		CONFIG_HLD1045
1112c609719bSwdenk
1113c609719bSwdenk			HLD1045 display, 640x480.
1114c609719bSwdenk			Active, color, single scan.
1115c609719bSwdenk
1116c609719bSwdenk		CONFIG_OPTREX_BW
1117c609719bSwdenk
1118c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1119c609719bSwdenk			or
1120c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1121c609719bSwdenk			or
1122c609719bSwdenk			Hitachi	 SP14Q002
1123c609719bSwdenk
1124c609719bSwdenk			320x240. Black & white.
1125c609719bSwdenk
1126c609719bSwdenk		Normally display is black on white background; define
11276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1128c609719bSwdenk
11297152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1130d791b1dcSwdenk
1131d791b1dcSwdenk		If this option is set, the environment is checked for
1132d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1133d791b1dcSwdenk		of logo, copyright and system information on the LCD
1134e94d2cd9Swdenk		is suppressed and the BMP image at the address
1135d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1136d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1137d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1138d791b1dcSwdenk		loaded very quickly after power-on.
1139d791b1dcSwdenk
11401ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
11411ca298ceSMatthias Weisser
11421ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
11431ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
11441ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
11451ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
11461ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
11471ca298ceSMatthias Weisser		specify 'm' for centering the image.
11481ca298ceSMatthias Weisser
11491ca298ceSMatthias Weisser		Example:
11501ca298ceSMatthias Weisser		setenv splashpos m,m
11511ca298ceSMatthias Weisser			=> image at center of screen
11521ca298ceSMatthias Weisser
11531ca298ceSMatthias Weisser		setenv splashpos 30,20
11541ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
11551ca298ceSMatthias Weisser
11561ca298ceSMatthias Weisser		setenv splashpos -10,m
11571ca298ceSMatthias Weisser			=> vertically centered image
11581ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
11591ca298ceSMatthias Weisser
116098f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
116198f4a3dfSStefan Roese
116298f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
116398f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
116498f4a3dfSStefan Roese		splashscreen support or the bmp command.
116598f4a3dfSStefan Roese
1166d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1167d5011762SAnatolij Gustschin
1168d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1169d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1170d5011762SAnatolij Gustschin		bmp command.
1171d5011762SAnatolij Gustschin
1172c29fdfc1Swdenk- Compression support:
1173c29fdfc1Swdenk		CONFIG_BZIP2
1174c29fdfc1Swdenk
1175c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1176c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1177c29fdfc1Swdenk		compressed images are supported.
1178c29fdfc1Swdenk
1179c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
11806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1181c29fdfc1Swdenk		be at least 4MB.
1182d791b1dcSwdenk
1183fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1184fc9c1727SLuigi 'Comio' Mantellini
1185fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1186fc9c1727SLuigi 'Comio' Mantellini		images is included.
1187fc9c1727SLuigi 'Comio' Mantellini
1188fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1189fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1190fc9c1727SLuigi 'Comio' Mantellini		formula:
1191fc9c1727SLuigi 'Comio' Mantellini
1192fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1193fc9c1727SLuigi 'Comio' Mantellini
1194fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1195fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1196fc9c1727SLuigi 'Comio' Mantellini
1197fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1198fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1199fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1200fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1201fc9c1727SLuigi 'Comio' Mantellini
1202fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1203fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
12046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1205fc9c1727SLuigi 'Comio' Mantellini
120617ea1177Swdenk- MII/PHY support:
120717ea1177Swdenk		CONFIG_PHY_ADDR
120817ea1177Swdenk
120917ea1177Swdenk		The address of PHY on MII bus.
121017ea1177Swdenk
121117ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
121217ea1177Swdenk
121317ea1177Swdenk		The clock frequency of the MII bus
121417ea1177Swdenk
121517ea1177Swdenk		CONFIG_PHY_GIGE
121617ea1177Swdenk
121717ea1177Swdenk		If this option is set, support for speed/duplex
121811ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
121917ea1177Swdenk
122017ea1177Swdenk		CONFIG_PHY_RESET_DELAY
122117ea1177Swdenk
122217ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
122317ea1177Swdenk		reset before any MII register access is possible.
122417ea1177Swdenk		For such PHY, set this option to the usec delay
122517ea1177Swdenk		required. (minimum 300usec for LXT971A)
122617ea1177Swdenk
122717ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
122817ea1177Swdenk
122917ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
123017ea1177Swdenk		command issued before MII status register can be read
123117ea1177Swdenk
1232c609719bSwdenk- Ethernet address:
1233c609719bSwdenk		CONFIG_ETHADDR
1234c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1235c609719bSwdenk		CONFIG_ETH2ADDR
1236c609719bSwdenk		CONFIG_ETH3ADDR
1237c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1238c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1239c609719bSwdenk
124011ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
124111ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1242c609719bSwdenk		is not determined automatically.
1243c609719bSwdenk
1244c609719bSwdenk- IP address:
1245c609719bSwdenk		CONFIG_IPADDR
1246c609719bSwdenk
1247c609719bSwdenk		Define a default value for the IP address to use for
124811ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1249c609719bSwdenk		determined through e.g. bootp.
1250c609719bSwdenk
1251c609719bSwdenk- Server IP address:
1252c609719bSwdenk		CONFIG_SERVERIP
1253c609719bSwdenk
1254c609719bSwdenk		Defines a default value for the IP address of a TFTP
1255c609719bSwdenk		server to contact when using the "tftboot" command.
1256c609719bSwdenk
125797cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
125897cfe861SRobin Getz
125997cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
126097cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
126197cfe861SRobin Getz
126253a5c424SDavid Updegraff- Multicast TFTP Mode:
126353a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
126453a5c424SDavid Updegraff
126553a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
126653a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
126711ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
126853a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
126953a5c424SDavid Updegraff		multicast group.
127053a5c424SDavid Updegraff
127153a5c424SDavid Updegraff		CONFIG_BOOTP_RANDOM_DELAY
1272c609719bSwdenk- BOOTP Recovery Mode:
1273c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1274c609719bSwdenk
1275c609719bSwdenk		If you have many targets in a network that try to
1276c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1277c609719bSwdenk		systems send out BOOTP requests at precisely the same
1278c609719bSwdenk		moment (which would happen for instance at recovery
1279c609719bSwdenk		from a power failure, when all systems will try to
1280c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1281c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1282c609719bSwdenk		inserted before sending out BOOTP requests. The
12836c33c785SWolfgang Denk		following delays are inserted then:
1284c609719bSwdenk
1285c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1286c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1287c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1288c609719bSwdenk		4th and following
1289c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1290c609719bSwdenk
1291fe389a82Sstroese- DHCP Advanced Options:
12921fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
12931fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1294fe389a82Sstroese
12951fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
12961fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
12971fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
12981fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
12991fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
13001fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
13011fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
13021fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
13031fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
13041fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
13051fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
13061fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
1307fe389a82Sstroese
13085d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
13095d110f0aSWilson Callan		environment variable, not the BOOTP server.
1310fe389a82Sstroese
1311fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1312fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1313fe389a82Sstroese		than one DNS serverip is offered to the client.
1314fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1315fe389a82Sstroese		serverip will be stored in the additional environment
1316fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1317fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
13181fe80d79SJon Loeliger		is defined.
1319fe389a82Sstroese
1320fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1321fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1322fe389a82Sstroese		need the hostname of the DHCP requester.
13235d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
13241fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
13251fe80d79SJon Loeliger		option 12 to the DHCP server.
1326fe389a82Sstroese
1327d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1328d9a2f416SAras Vaichas
1329d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1330d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1331d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1332d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1333d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1334d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1335d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1336d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1337d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1338d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1339d9a2f416SAras Vaichas		this delay.
1340d9a2f416SAras Vaichas
1341a3d991bdSwdenk - CDP Options:
1342a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1343a3d991bdSwdenk
1344a3d991bdSwdenk		The device id used in CDP trigger frames.
1345a3d991bdSwdenk
1346a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1347a3d991bdSwdenk
1348a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1349a3d991bdSwdenk		of the device.
1350a3d991bdSwdenk
1351a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1352a3d991bdSwdenk
1353a3d991bdSwdenk		A printf format string which contains the ascii name of
1354a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
135511ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1356a3d991bdSwdenk
1357a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1358a3d991bdSwdenk
1359a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1360a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1361a3d991bdSwdenk
1362a3d991bdSwdenk		CONFIG_CDP_VERSION
1363a3d991bdSwdenk
1364a3d991bdSwdenk		An ascii string containing the version of the software.
1365a3d991bdSwdenk
1366a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1367a3d991bdSwdenk
1368a3d991bdSwdenk		An ascii string containing the name of the platform.
1369a3d991bdSwdenk
1370a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1371a3d991bdSwdenk
1372a3d991bdSwdenk		A 32bit integer sent on the trigger.
1373a3d991bdSwdenk
1374a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1375a3d991bdSwdenk
1376a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1377a3d991bdSwdenk		device in .1 of milliwatts.
1378a3d991bdSwdenk
1379a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1380a3d991bdSwdenk
1381a3d991bdSwdenk		A byte containing the id of the VLAN.
1382a3d991bdSwdenk
1383c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1384c609719bSwdenk
1385c609719bSwdenk		Several configurations allow to display the current
1386c609719bSwdenk		status using a LED. For instance, the LED will blink
1387c609719bSwdenk		fast while running U-Boot code, stop blinking as
1388c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1389c609719bSwdenk		start blinking slow once the Linux kernel is running
1390c609719bSwdenk		(supported by a status LED driver in the Linux
1391c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1392c609719bSwdenk		feature in U-Boot.
1393c609719bSwdenk
1394c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1395c609719bSwdenk
1396c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1397c609719bSwdenk		on those systems that support this (optional)
1398c609719bSwdenk		feature, like the TQM8xxL modules.
1399c609719bSwdenk
1400c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1401c609719bSwdenk
1402b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1403b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
140411ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1405c609719bSwdenk
1406b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1407602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1408b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1409b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1410c609719bSwdenk		command line interface.
1411c609719bSwdenk
1412bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1413c609719bSwdenk
1414b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1415b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1416b37c7e5eSwdenk		support for I2C.
1417c609719bSwdenk
1418b37c7e5eSwdenk		There are several other quantities that must also be
1419b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1420c609719bSwdenk
14216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1422b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
14236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
142411ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1425c609719bSwdenk
14268d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
1427a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
14288d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
14298d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
14308d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
1431b37c7e5eSwdenk
14325da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
14335da71efaSEric Millbrandt
14345da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
14355da71efaSEric Millbrandt		chips might think that the current transfer is still
14365da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
14375da71efaSEric Millbrandt		commands until the slave device responds.
14385da71efaSEric Millbrandt
1439b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1440b37c7e5eSwdenk
1441b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1442b37c7e5eSwdenk		then the following macros need to be defined (examples are
1443b37c7e5eSwdenk		from include/configs/lwmon.h):
1444c609719bSwdenk
1445c609719bSwdenk		I2C_INIT
1446c609719bSwdenk
1447b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1448c609719bSwdenk		controller or configure ports.
1449c609719bSwdenk
1450b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1451b37c7e5eSwdenk
1452c609719bSwdenk		I2C_PORT
1453c609719bSwdenk
1454c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1455c609719bSwdenk		assumes both bits are on the same port). Valid values
1456c609719bSwdenk		are 0..3 for ports A..D.
1457c609719bSwdenk
1458c609719bSwdenk		I2C_ACTIVE
1459c609719bSwdenk
1460c609719bSwdenk		The code necessary to make the I2C data line active
1461c609719bSwdenk		(driven).  If the data line is open collector, this
1462c609719bSwdenk		define can be null.
1463c609719bSwdenk
1464b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1465b37c7e5eSwdenk
1466c609719bSwdenk		I2C_TRISTATE
1467c609719bSwdenk
1468c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1469c609719bSwdenk		(inactive).  If the data line is open collector, this
1470c609719bSwdenk		define can be null.
1471c609719bSwdenk
1472b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1473b37c7e5eSwdenk
1474c609719bSwdenk		I2C_READ
1475c609719bSwdenk
1476c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1477c609719bSwdenk		FALSE if it is low.
1478c609719bSwdenk
1479b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1480b37c7e5eSwdenk
1481c609719bSwdenk		I2C_SDA(bit)
1482c609719bSwdenk
1483c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1484c609719bSwdenk		is FALSE, it clears it (low).
1485c609719bSwdenk
1486b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1487b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1488b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1489b37c7e5eSwdenk
1490c609719bSwdenk		I2C_SCL(bit)
1491c609719bSwdenk
1492c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1493c609719bSwdenk		is FALSE, it clears it (low).
1494c609719bSwdenk
1495b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1496b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1497b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1498b37c7e5eSwdenk
1499c609719bSwdenk		I2C_DELAY
1500c609719bSwdenk
1501c609719bSwdenk		This delay is invoked four times per clock cycle so this
1502c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1503b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1504b37c7e5eSwdenk		like:
1505b37c7e5eSwdenk
1506b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1507c609719bSwdenk
1508793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1509793b5726SMike Frysinger
1510793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
1511793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
1512793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
1513793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
1514793b5726SMike Frysinger
1515793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
1516793b5726SMike Frysinger		the generic GPIO functions.
1517793b5726SMike Frysinger
15186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
151947cd00faSwdenk
152047cd00faSwdenk		When a board is reset during an i2c bus transfer
152147cd00faSwdenk		chips might think that the current transfer is still
152247cd00faSwdenk		in progress. On some boards it is possible to access
152347cd00faSwdenk		the i2c SCLK line directly, either by using the
152447cd00faSwdenk		processor pin as a GPIO or by having a second pin
152547cd00faSwdenk		connected to the bus. If this option is defined a
152647cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
152747cd00faSwdenk		is run early in the boot sequence.
152847cd00faSwdenk
152926a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
153026a33504SRichard Retanubun
153126a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
153226a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
153326a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
153426a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
153526a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
153626a33504SRichard Retanubun		controller provide such a method. It is called at the end of
153726a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
153826a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
153926a33504SRichard Retanubun
154017ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
154117ea1177Swdenk
154217ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
154317ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
154417ea1177Swdenk		variable "i2cfast". (see also i2cfast)
154517ea1177Swdenk
1546bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
1547bb99ad6dSBen Warren
1548bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
1549bb99ad6dSBen Warren		must have a controller.  At any point in time, only one bus is
1550bb99ad6dSBen Warren		active.  To switch to a different bus, use the 'i2c dev' command.
1551bb99ad6dSBen Warren		Note that bus numbering is zero-based.
1552bb99ad6dSBen Warren
15536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
1554bb99ad6dSBen Warren
1555bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
15560f89c54bSPeter Tyser		when the 'i2c probe' command is issued.  If CONFIG_I2C_MULTI_BUS
15570f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
15580f89c54bSPeter Tyser		a 1D array of device addresses
1559bb99ad6dSBen Warren
1560bb99ad6dSBen Warren		e.g.
1561bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
15626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES	{0x50,0x68}
1563bb99ad6dSBen Warren
1564bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
1565bb99ad6dSBen Warren
1566bb99ad6dSBen Warren			#define	CONFIG_I2C_MULTI_BUS
15676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
1568bb99ad6dSBen Warren
1569bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1570bb99ad6dSBen Warren
15716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
1572be5e6181STimur Tabi
1573be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
1574be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1575be5e6181STimur Tabi
15766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
15770dc018ecSStefan Roese
15780dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
15790dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
15800dc018ecSStefan Roese
15816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
15820dc018ecSStefan Roese
15830dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
15840dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
15850dc018ecSStefan Roese
15866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
15879ebbb54fSVictor Gallardo
15889ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
15899ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
15909ebbb54fSVictor Gallardo		specified DTT device.
15919ebbb54fSVictor Gallardo
1592be5e6181STimur Tabi		CONFIG_FSL_I2C
1593be5e6181STimur Tabi
1594be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
15957817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
1596be5e6181STimur Tabi
159767b23a32SHeiko Schocher		CONFIG_I2C_MUX
159867b23a32SHeiko Schocher
159967b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
160067b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
160167b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
160267b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
160367b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
160467b23a32SHeiko Schocher		the muxes to activate this new "bus".
160567b23a32SHeiko Schocher
160667b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
160767b23a32SHeiko Schocher		feature!
160867b23a32SHeiko Schocher
160967b23a32SHeiko Schocher		Example:
161067b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
161167b23a32SHeiko Schocher			The First mux with address 70 and channel 6
161267b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
161367b23a32SHeiko Schocher
161467b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
161567b23a32SHeiko Schocher
161667b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
161767b23a32SHeiko Schocher		of I2C Busses with muxes:
161867b23a32SHeiko Schocher
161967b23a32SHeiko Schocher		=> i2c bus
162067b23a32SHeiko Schocher		Busses reached over muxes:
162167b23a32SHeiko Schocher		Bus ID: 2
162267b23a32SHeiko Schocher		  reached over Mux(es):
162367b23a32SHeiko Schocher		    pca9544a@70 ch: 4
162467b23a32SHeiko Schocher		Bus ID: 3
162567b23a32SHeiko Schocher		  reached over Mux(es):
162667b23a32SHeiko Schocher		    pca9544a@70 ch: 6
162767b23a32SHeiko Schocher		    pca9544a@71 ch: 4
162867b23a32SHeiko Schocher		=>
162967b23a32SHeiko Schocher
163067b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
163167b23a32SHeiko Schocher		u-boot sends First the Commando to the mux@70 to enable
163267b23a32SHeiko Schocher		channel 6, and then the Commando to the mux@71 to enable
163367b23a32SHeiko Schocher		the channel 4.
163467b23a32SHeiko Schocher
163567b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
163667b23a32SHeiko Schocher		usual, to communicate with your I2C devices behind
163767b23a32SHeiko Schocher		the 2 muxes.
163867b23a32SHeiko Schocher
163967b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
164067b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
164167b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
164267b23a32SHeiko Schocher		to add this option to other architectures.
164367b23a32SHeiko Schocher
16442ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
16452ac6985aSAndrew Dyer
16462ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
16472ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
16482ac6985aSAndrew Dyer		between writing the address pointer and reading the
16492ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
16502ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
16512ac6985aSAndrew Dyer		devices can use either method, but some require one or
16522ac6985aSAndrew Dyer		the other.
1653be5e6181STimur Tabi
1654c609719bSwdenk- SPI Support:	CONFIG_SPI
1655c609719bSwdenk
1656c609719bSwdenk		Enables SPI driver (so far only tested with
1657c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
1658c609719bSwdenk		D/As on the SACSng board)
1659c609719bSwdenk
1660c609719bSwdenk		CONFIG_SPI_X
1661c609719bSwdenk
1662c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
1663c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
1664c609719bSwdenk
1665c609719bSwdenk		CONFIG_SOFT_SPI
1666c609719bSwdenk
1667c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
1668c609719bSwdenk		using hardware support. This is a general purpose
1669c609719bSwdenk		driver that only requires three general I/O port pins
1670c609719bSwdenk		(two outputs, one input) to function. If this is
1671c609719bSwdenk		defined, the board configuration must define several
1672c609719bSwdenk		SPI configuration items (port pins to use, etc). For
1673c609719bSwdenk		an example, see include/configs/sacsng.h.
1674c609719bSwdenk
167504a9e118SBen Warren		CONFIG_HARD_SPI
167604a9e118SBen Warren
167704a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
167804a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
167904a9e118SBen Warren		must define a list of chip-select function pointers.
168004a9e118SBen Warren		Currently supported on some MPC8xxx processors.  For an
168104a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
168204a9e118SBen Warren
168338254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
168438254f45SGuennadi Liakhovetski
168538254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
168638254f45SGuennadi Liakhovetski		SoCs. Currently only i.MX31 is supported.
168738254f45SGuennadi Liakhovetski
16880133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
16890133502eSMatthias Fuchs
16900133502eSMatthias Fuchs		Enables FPGA subsystem.
16910133502eSMatthias Fuchs
16920133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
16930133502eSMatthias Fuchs
16940133502eSMatthias Fuchs		Enables support for specific chip vendors.
16950133502eSMatthias Fuchs		(ALTERA, XILINX)
16960133502eSMatthias Fuchs
16970133502eSMatthias Fuchs		CONFIG_FPGA_<family>
16980133502eSMatthias Fuchs
16990133502eSMatthias Fuchs		Enables support for FPGA family.
17000133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
17010133502eSMatthias Fuchs
17020133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
1703c609719bSwdenk
1704c609719bSwdenk		Specify the number of FPGA devices to support.
1705c609719bSwdenk
17066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
1707c609719bSwdenk
1708c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
1709c609719bSwdenk
17106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
1711c609719bSwdenk
1712c609719bSwdenk		Enable checks on FPGA configuration interface busy
1713c609719bSwdenk		status by the configuration function. This option
1714c609719bSwdenk		will require a board or device specific function to
1715c609719bSwdenk		be written.
1716c609719bSwdenk
1717c609719bSwdenk		CONFIG_FPGA_DELAY
1718c609719bSwdenk
1719c609719bSwdenk		If defined, a function that provides delays in the FPGA
1720c609719bSwdenk		configuration driver.
1721c609719bSwdenk
17226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
1723c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1724c609719bSwdenk
17256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
1726c609719bSwdenk
1727c609719bSwdenk		Check for configuration errors during FPGA bitfile
1728c609719bSwdenk		loading. For example, abort during Virtex II
1729c609719bSwdenk		configuration if the INIT_B line goes low (which
1730c609719bSwdenk		indicated a CRC error).
1731c609719bSwdenk
17326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
1733c609719bSwdenk
1734c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
1735c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
1736c609719bSwdenk		FPGA configuration sequence. The default time is 500
173711ccc33fSMarcel Ziswiler		ms.
1738c609719bSwdenk
17396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
1740c609719bSwdenk
1741c609719bSwdenk		Maximum time to wait for BUSY to deassert during
174211ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
1743c609719bSwdenk
17446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
1745c609719bSwdenk
1746c609719bSwdenk		Time to wait after FPGA configuration. The default is
174711ccc33fSMarcel Ziswiler		200 ms.
1748c609719bSwdenk
1749c609719bSwdenk- Configuration Management:
1750c609719bSwdenk		CONFIG_IDENT_STRING
1751c609719bSwdenk
1752c609719bSwdenk		If defined, this string will be added to the U-Boot
1753c609719bSwdenk		version information (U_BOOT_VERSION)
1754c609719bSwdenk
1755c609719bSwdenk- Vendor Parameter Protection:
1756c609719bSwdenk
1757c609719bSwdenk		U-Boot considers the values of the environment
1758c609719bSwdenk		variables "serial#" (Board Serial Number) and
17597152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
1760c609719bSwdenk		are set once by the board vendor / manufacturer, and
1761c609719bSwdenk		protects these variables from casual modification by
1762c609719bSwdenk		the user. Once set, these variables are read-only,
1763c609719bSwdenk		and write or delete attempts are rejected. You can
176411ccc33fSMarcel Ziswiler		change this behaviour:
1765c609719bSwdenk
1766c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
1767c609719bSwdenk		file, the write protection for vendor parameters is
176847cd00faSwdenk		completely disabled. Anybody can change or delete
1769c609719bSwdenk		these parameters.
1770c609719bSwdenk
1771c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
1772c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
177311ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
1774c609719bSwdenk		which can be changed exactly ONCE by the user. [The
1775c609719bSwdenk		serial# is unaffected by this, i. e. it remains
1776c609719bSwdenk		read-only.]
1777c609719bSwdenk
1778c609719bSwdenk- Protected RAM:
1779c609719bSwdenk		CONFIG_PRAM
1780c609719bSwdenk
1781c609719bSwdenk		Define this variable to enable the reservation of
1782c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
1783c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
1784c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
1785c609719bSwdenk		this default value by defining an environment
1786c609719bSwdenk		variable "pram" to the number of kB you want to
1787c609719bSwdenk		reserve. Note that the board info structure will
1788c609719bSwdenk		still show the full amount of RAM. If pRAM is
1789c609719bSwdenk		reserved, a new environment variable "mem" will
1790c609719bSwdenk		automatically be defined to hold the amount of
1791c609719bSwdenk		remaining RAM in a form that can be passed as boot
1792c609719bSwdenk		argument to Linux, for instance like that:
1793c609719bSwdenk
1794fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
1795c609719bSwdenk			saveenv
1796c609719bSwdenk
1797c609719bSwdenk		This way you can tell Linux not to use this memory,
1798c609719bSwdenk		either, which results in a memory region that will
1799c609719bSwdenk		not be affected by reboots.
1800c609719bSwdenk
1801c609719bSwdenk		*WARNING* If your board configuration uses automatic
1802c609719bSwdenk		detection of the RAM size, you must make sure that
1803c609719bSwdenk		this memory test is non-destructive. So far, the
1804c609719bSwdenk		following board configurations are known to be
1805c609719bSwdenk		"pRAM-clean":
1806c609719bSwdenk
1807c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1808c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
1809544d97e9SWolfgang Denk			FLAGADM, TQM8260
1810c609719bSwdenk
1811c609719bSwdenk- Error Recovery:
1812c609719bSwdenk		CONFIG_PANIC_HANG
1813c609719bSwdenk
1814c609719bSwdenk		Define this variable to stop the system in case of a
1815c609719bSwdenk		fatal error, so that you have to reset it manually.
1816c609719bSwdenk		This is probably NOT a good idea for an embedded
181711ccc33fSMarcel Ziswiler		system where you want the system to reboot
1818c609719bSwdenk		automatically as fast as possible, but it may be
1819c609719bSwdenk		useful during development since you can try to debug
1820c609719bSwdenk		the conditions that lead to the situation.
1821c609719bSwdenk
1822c609719bSwdenk		CONFIG_NET_RETRY_COUNT
1823c609719bSwdenk
1824c609719bSwdenk		This variable defines the number of retries for
1825c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
1826c609719bSwdenk		before giving up the operation. If not defined, a
1827c609719bSwdenk		default value of 5 is used.
1828c609719bSwdenk
182940cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
183040cb90eeSGuennadi Liakhovetski
183140cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
183240cb90eeSGuennadi Liakhovetski
1833c609719bSwdenk- Command Interpreter:
18348078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
183504a85b3bSwdenk
183604a85b3bSwdenk		Enable auto completion of commands using TAB.
183704a85b3bSwdenk
18388078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
18398078f1a5SWolfgang Denk		for the "hush" shell.
18408078f1a5SWolfgang Denk
18418078f1a5SWolfgang Denk
18426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
1843c609719bSwdenk
1844c609719bSwdenk		Define this variable to enable the "hush" shell (from
1845c609719bSwdenk		Busybox) as command line interpreter, thus enabling
1846c609719bSwdenk		powerful command line syntax like
1847c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
1848c609719bSwdenk		constructs ("shell scripts").
1849c609719bSwdenk
1850c609719bSwdenk		If undefined, you get the old, much simpler behaviour
1851c609719bSwdenk		with a somewhat smaller memory footprint.
1852c609719bSwdenk
1853c609719bSwdenk
18546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
1855c609719bSwdenk
1856c609719bSwdenk		This defines the secondary prompt string, which is
1857c609719bSwdenk		printed when the command interpreter needs more input
1858c609719bSwdenk		to complete a command. Usually "> ".
1859c609719bSwdenk
1860c609719bSwdenk	Note:
1861c609719bSwdenk
1862c609719bSwdenk		In the current implementation, the local variables
1863c609719bSwdenk		space and global environment variables space are
1864c609719bSwdenk		separated. Local variables are those you define by
18653b57fe0aSwdenk		simply typing `name=value'. To access a local
1866c609719bSwdenk		variable later on, you have write `$name' or
18673b57fe0aSwdenk		`${name}'; to execute the contents of a variable
18683b57fe0aSwdenk		directly type `$name' at the command prompt.
1869c609719bSwdenk
1870c609719bSwdenk		Global environment variables are those you use
1871c609719bSwdenk		setenv/printenv to work with. To run a command stored
1872c609719bSwdenk		in such a variable, you need to use the run command,
1873c609719bSwdenk		and you must not use the '$' sign to access them.
1874c609719bSwdenk
1875c609719bSwdenk		To store commands and special characters in a
1876c609719bSwdenk		variable, please use double quotation marks
1877c609719bSwdenk		surrounding the whole text of the variable, instead
1878c609719bSwdenk		of the backslashes before semicolons and special
1879c609719bSwdenk		symbols.
1880c609719bSwdenk
1881aa0c71acSWolfgang Denk- Commandline Editing and History:
1882aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
1883aa0c71acSWolfgang Denk
188411ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
1885aa0c71acSWolfgang Denk		commandline input operations
1886aa0c71acSWolfgang Denk
1887a8c7c708Swdenk- Default Environment:
1888c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
1889c609719bSwdenk
1890c609719bSwdenk		Define this to contain any number of null terminated
1891c609719bSwdenk		strings (variable = value pairs) that will be part of
18927152b1d0Swdenk		the default environment compiled into the boot image.
18932262cfeeSwdenk
1894c609719bSwdenk		For example, place something like this in your
1895c609719bSwdenk		board's config file:
1896c609719bSwdenk
1897c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
1898c609719bSwdenk			"myvar1=value1\0" \
1899c609719bSwdenk			"myvar2=value2\0"
1900c609719bSwdenk
1901c609719bSwdenk		Warning: This method is based on knowledge about the
1902c609719bSwdenk		internal format how the environment is stored by the
19032262cfeeSwdenk		U-Boot code. This is NOT an official, exported
1904c609719bSwdenk		interface! Although it is unlikely that this format
19057152b1d0Swdenk		will change soon, there is no guarantee either.
1906c609719bSwdenk		You better know what you are doing here.
1907c609719bSwdenk
1908c609719bSwdenk		Note: overly (ab)use of the default environment is
1909c609719bSwdenk		discouraged. Make sure to check other ways to preset
191074de7aefSWolfgang Denk		the environment like the "source" command or the
1911c609719bSwdenk		boot command first.
1912c609719bSwdenk
1913a8c7c708Swdenk- DataFlash Support:
19142abbe075Swdenk		CONFIG_HAS_DATAFLASH
19152abbe075Swdenk
19162abbe075Swdenk		Defining this option enables DataFlash features and
19172abbe075Swdenk		allows to read/write in Dataflash via the standard
19182abbe075Swdenk		commands cp, md...
19192abbe075Swdenk
19203f85ce27Swdenk- SystemACE Support:
19213f85ce27Swdenk		CONFIG_SYSTEMACE
19223f85ce27Swdenk
19233f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
19243f85ce27Swdenk		chips attached via some sort of local bus. The address
192511ccc33fSMarcel Ziswiler		of the chip must also be defined in the
19266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
19273f85ce27Swdenk
19283f85ce27Swdenk		#define CONFIG_SYSTEMACE
19296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
19303f85ce27Swdenk
19313f85ce27Swdenk		When SystemACE support is added, the "ace" device type
19323f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
19333f85ce27Swdenk
1934ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
1935ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
1936ecb0ccd9SWolfgang Denk
193728cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
1938ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
193928cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
1940ecb0ccd9SWolfgang Denk		number generator is used.
1941ecb0ccd9SWolfgang Denk
194228cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
194328cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
194428cb9375SWolfgang Denk		defined, the normal port 69 is used.
194528cb9375SWolfgang Denk
194628cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
1947ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
1948ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
1949ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
1950ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
1951ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
1952ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
1953ecb0ccd9SWolfgang Denk
1954a8c7c708Swdenk- Show boot progress:
1955c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
1956c609719bSwdenk
1957c609719bSwdenk		Defining this option allows to add some board-
1958c609719bSwdenk		specific code (calling a user-provided function
1959c609719bSwdenk		"show_boot_progress(int)") that enables you to show
1960c609719bSwdenk		the system's boot progress on some display (for
1961c609719bSwdenk		example, some LED's) on your board. At the moment,
1962c609719bSwdenk		the following checkpoints are implemented:
1963c609719bSwdenk
19641372cce2SMarian BalakowiczLegacy uImage format:
19651372cce2SMarian Balakowicz
1966c609719bSwdenk  Arg	Where			When
1967c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
1968c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
1969c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
1970c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
1971c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
1972c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
1973c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
1974c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
1975c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
19761372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
1977c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
1978c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
1979c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
1980c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
19811372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
1982c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
19831372cce2SMarian Balakowicz
19841372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
19851372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
19861372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
19871372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
19881372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
19891372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
19901372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
199111ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
19921372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
19931372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
19941372cce2SMarian Balakowicz
1995ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c	All preparation done, transferring control to OS
1996c609719bSwdenk
1997a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
199863e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
199963e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
200063e73c9aSwdenk
2001566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2002566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2003566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2004566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2005566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2006566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2007566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2008566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2009566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2010566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2011566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2012566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2013566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2014566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2015566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2016566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2017566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2018566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2019566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2020566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2021566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2022566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2023566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2024566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2025566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2026566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2027566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2028566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2029566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2030566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2031566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2032566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2033566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2034566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2035566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2036566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2037566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2038566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2039566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2040566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2041566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2042566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2043566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2044566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2045566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2046566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2047566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2048c609719bSwdenk
2049566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2050c609719bSwdenk
2051566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2052566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2053566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2054206c60cbSwdenk
2055566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2056566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
205711ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2058566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2059566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2060566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
206174de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
206274de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2063566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2064c609719bSwdenk
20651372cce2SMarian BalakowiczFIT uImage format:
20661372cce2SMarian Balakowicz
20671372cce2SMarian Balakowicz  Arg	Where			When
20681372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
20691372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
20701372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
20711372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
20721372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
20731372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2074f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
20751372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
20761372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
20771372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
20781372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
20791372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
208011ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
208111ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
20821372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
20831372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
20841372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
20851372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
20861372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
20871372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
20881372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
20891372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
20901372cce2SMarian Balakowicz
20911372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
20921372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
20931372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
209411ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
20951372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
20961372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
20971372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
20981372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
20991372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
21001372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
21011372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
21021372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
21031372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
21041372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
21051372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
21061372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
21071372cce2SMarian Balakowicz
210811ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
21091372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
21101372cce2SMarian Balakowicz
211111ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
21121372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
21131372cce2SMarian Balakowicz
211411ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
21151372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
21161372cce2SMarian Balakowicz
2117cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2118cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2119cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2120cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2121cccfc2abSDetlev Zundel
2122cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2123cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2124cccfc2abSDetlev Zundel
2125cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2126cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2127cccfc2abSDetlev Zundel
2128cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2129cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2130cccfc2abSDetlev Zundel
2131cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2132cccfc2abSDetlev Zundel
2133cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2134cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2135cccfc2abSDetlev Zundel
21361372cce2SMarian Balakowicz
2137c609719bSwdenkModem Support:
2138c609719bSwdenk--------------
2139c609719bSwdenk
214085ec0bccSwdenk[so far only for SMDK2400 and TRAB boards]
2141c609719bSwdenk
214211ccc33fSMarcel Ziswiler- Modem support enable:
2143c609719bSwdenk		CONFIG_MODEM_SUPPORT
2144c609719bSwdenk
2145c609719bSwdenk- RTS/CTS Flow control enable:
2146c609719bSwdenk		CONFIG_HWFLOW
2147c609719bSwdenk
2148c609719bSwdenk- Modem debug support:
2149c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
2150c609719bSwdenk
2151c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
2152c609719bSwdenk		for modem support. Useful only with BDI2000.
2153c609719bSwdenk
2154a8c7c708Swdenk- Interrupt support (PPC):
2155a8c7c708Swdenk
2156a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
2157a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
215811ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
2159a8c7c708Swdenk		should set decrementer_count to appropriate value. If
216011ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
2161a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
216211ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
2163a8c7c708Swdenk		specific handling. If board has watchdog / status_led
2164a8c7c708Swdenk		/ other_activity_monitor it works automatically from
2165a8c7c708Swdenk		general timer_interrupt().
2166a8c7c708Swdenk
2167c609719bSwdenk- General:
2168c609719bSwdenk
2169c609719bSwdenk		In the target system modem support is enabled when a
2170c609719bSwdenk		specific key (key combination) is pressed during
2171c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
217211ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
2173c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
2174c609719bSwdenk		function, returning 1 and thus enabling modem
2175c609719bSwdenk		initialization.
2176c609719bSwdenk
2177c609719bSwdenk		If there are no modem init strings in the
2178c609719bSwdenk		environment, U-Boot proceed to autoboot; the
2179c609719bSwdenk		previous output (banner, info printfs) will be
218011ccc33fSMarcel Ziswiler		suppressed, though.
2181c609719bSwdenk
2182c609719bSwdenk		See also: doc/README.Modem
2183c609719bSwdenk
2184c609719bSwdenk
2185c609719bSwdenkConfiguration Settings:
2186c609719bSwdenk-----------------------
2187c609719bSwdenk
21886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2189c609719bSwdenk		undefine this when you're short of memory.
2190c609719bSwdenk
21912fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
21922fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
21932fb2604dSPeter Tyser
21946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
2195c609719bSwdenk		prompt for user input.
2196c609719bSwdenk
21976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
2198c609719bSwdenk
21996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
2200c609719bSwdenk
22016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
2202c609719bSwdenk
22036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2204c609719bSwdenk		the application (usually a Linux kernel) when it is
2205c609719bSwdenk		booted
2206c609719bSwdenk
22076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
2208c609719bSwdenk		List of legal baudrate settings for this board.
2209c609719bSwdenk
22106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
2211c609719bSwdenk		Suppress display of console information at boot.
2212c609719bSwdenk
22136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
2214c609719bSwdenk		If the board specific function
2215c609719bSwdenk			extern int overwrite_console (void);
2216c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
2217c609719bSwdenk		serial port, else the settings in the environment are used.
2218c609719bSwdenk
22196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2220c609719bSwdenk		Enable the call to overwrite_console().
2221c609719bSwdenk
22226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2223c609719bSwdenk		Enable overwrite of previous console environment settings.
2224c609719bSwdenk
22256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2226c609719bSwdenk		Begin and End addresses of the area used by the
2227c609719bSwdenk		simple memory test.
2228c609719bSwdenk
22296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
2230c609719bSwdenk		Enable an alternate, more extensive memory test.
2231c609719bSwdenk
22326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
22335f535fe1Swdenk		Scratch address used by the alternate memory test
22345f535fe1Swdenk		You only need to set this if address zero isn't writeable
22355f535fe1Swdenk
22366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
22376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
223814f73ca6SStefan Roese		this specified memory area will get subtracted from the top
223911ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
224014f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
224114f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
224214f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
22435e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
224414f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
22455e12e75dSStefan Roese		will have to get fixed in Linux additionally.
224614f73ca6SStefan Roese
224714f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
224814f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
224914f73ca6SStefan Roese		be touched.
225014f73ca6SStefan Roese
225114f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
225214f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
225314f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
225414f73ca6SStefan Roese		non page size aligned address and this could cause major
225514f73ca6SStefan Roese		problems.
225614f73ca6SStefan Roese
22576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR:
2258c609719bSwdenk		Default load address for network file downloads
2259c609719bSwdenk
22606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
2261c609719bSwdenk		Enable temporary baudrate change while serial download
2262c609719bSwdenk
22636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
2264c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
2265c609719bSwdenk
22666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
2267c609719bSwdenk		Physical start address of Motherboard I/O (if using a
2268c609719bSwdenk		Cogent motherboard)
2269c609719bSwdenk
22706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
2271c609719bSwdenk		Physical start address of Flash memory.
2272c609719bSwdenk
22736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
2274c609719bSwdenk		Physical start address of boot monitor code (set by
2275c609719bSwdenk		make config files to be same as the text base address
227614d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
22776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
2278c609719bSwdenk
22796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
22803b57fe0aSwdenk		Size of memory reserved for monitor code, used to
22813b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
22823b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
22833b57fe0aSwdenk		flash sector.
2284c609719bSwdenk
22856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
2286c609719bSwdenk		Size of DRAM reserved for malloc() use.
2287c609719bSwdenk
22886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
228915940c9aSStefan Roese		Normally compressed uImages are limited to an
229015940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
22916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
229215940c9aSStefan Roese		to adjust this setting to your needs.
2293c609719bSwdenk
22946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
2295c609719bSwdenk		Maximum size of memory mapped by the startup code of
2296c609719bSwdenk		the Linux kernel; all data that must be processed by
22977d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
22987d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
22997d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
23007d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
23016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.
2302c609719bSwdenk
2303fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
2304fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
2305fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
2306fca43cc8SJohn Rigby		is enabled.
2307fca43cc8SJohn Rigby
2308fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
2309fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
2310fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
2311fca43cc8SJohn Rigby
2312fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
2313fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
2314fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
2315fca43cc8SJohn Rigby
23166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
2317c609719bSwdenk		Max number of Flash memory banks
2318c609719bSwdenk
23196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
2320c609719bSwdenk		Max number of sectors on a Flash chip
2321c609719bSwdenk
23226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
2323c609719bSwdenk		Timeout for Flash erase operations (in ms)
2324c609719bSwdenk
23256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
2326c609719bSwdenk		Timeout for Flash write operations (in ms)
2327c609719bSwdenk
23286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
23298564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
23308564acf9Swdenk
23316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
23328564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
23338564acf9Swdenk
23346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
23358564acf9Swdenk		If defined, hardware flash sectors protection is used
23368564acf9Swdenk		instead of U-Boot software protection.
23378564acf9Swdenk
23386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
2339c609719bSwdenk
2340c609719bSwdenk		Enable TFTP transfers directly to flash memory;
2341c609719bSwdenk		without this option such a download has to be
2342c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
2343c609719bSwdenk		copy from RAM to flash.
2344c609719bSwdenk
2345c609719bSwdenk		The two-step approach is usually more reliable, since
2346c609719bSwdenk		you can check if the download worked before you erase
234711ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
234811ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
2349c609719bSwdenk		downloaded image) this option may be very useful.
2350c609719bSwdenk
23516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
2352c609719bSwdenk		Define if the flash driver uses extra elements in the
23535653fc33Swdenk		common flash structure for storing flash geometry.
23545653fc33Swdenk
235500b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
23565653fc33Swdenk		This option also enables the building of the cfi_flash driver
23575653fc33Swdenk		in the drivers directory
235853cf9435Sstroese
235991809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
236091809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
236191809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
236291809ed5SPiotr Ziecik		to the MTD layer.
236391809ed5SPiotr Ziecik
23646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
236596ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
236696ef831fSGuennadi Liakhovetski
236796ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
236896ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
236996ef831fSGuennadi Liakhovetski		write commands.
237096ef831fSGuennadi Liakhovetski
23716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
23725568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
23735568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
23745568e613SStefan Roese		is useful, if some of the configured banks are only
23755568e613SStefan Roese		optionally available.
23765568e613SStefan Roese
23779a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
23789a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
23799a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
23809a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
23819a042e9cSJerry Van Baren
23826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
238311ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
238411ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
238553cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
238653cf9435Sstroese		buffers can be full shortly after enabling the interface
238711ccc33fSMarcel Ziswiler		on high Ethernet traffic.
238853cf9435Sstroese		Defaults to 4 if not defined.
2389c609719bSwdenk
2390ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
2391ea882bafSWolfgang Denk
2392ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
2393ea882bafSWolfgang Denk	internally to store the environment settings. The default
2394ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
2395ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
2396ea882bafSWolfgang Denk	lib/hashtable.c for details.
2397ea882bafSWolfgang Denk
2398c609719bSwdenkThe following definitions that deal with the placement and management
2399c609719bSwdenkof environment data (variable area); in general, we support the
2400c609719bSwdenkfollowing configurations:
2401c609719bSwdenk
24025a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
2403c609719bSwdenk
2404c609719bSwdenk	Define this if the environment is in flash memory.
2405c609719bSwdenk
2406c609719bSwdenk	a) The environment occupies one whole flash sector, which is
2407c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
2408c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
2409c609719bSwdenk	   sector" type flash chips, which have several smaller
2410c609719bSwdenk	   sectors at the start or the end. For instance, such a
2411c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2412c609719bSwdenk	   such a case you would place the environment in one of the
2413c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
2414c609719bSwdenk	   "top boot sector" type flash chips, you would put the
2415c609719bSwdenk	   environment in one of the last sectors, leaving a gap
2416c609719bSwdenk	   between U-Boot and the environment.
2417c609719bSwdenk
24180e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
2419c609719bSwdenk
2420c609719bSwdenk	   Offset of environment data (variable area) to the
2421c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
2422c609719bSwdenk	   type flash chips the second sector can be used: the offset
2423c609719bSwdenk	   for this sector is given here.
2424c609719bSwdenk
24256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
2426c609719bSwdenk
24270e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
2428c609719bSwdenk
2429c609719bSwdenk	   This is just another way to specify the start address of
2430c609719bSwdenk	   the flash sector containing the environment (instead of
24310e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
2432c609719bSwdenk
24330e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
2434c609719bSwdenk
2435c609719bSwdenk	   Size of the sector containing the environment.
2436c609719bSwdenk
2437c609719bSwdenk
2438c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
2439c609719bSwdenk	   In such a case you don't want to spend a whole sector for
2440c609719bSwdenk	   the environment.
2441c609719bSwdenk
24420e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2443c609719bSwdenk
24445a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
24450e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
2446c609719bSwdenk	   of this flash sector for the environment. This saves
2447c609719bSwdenk	   memory for the RAM copy of the environment.
2448c609719bSwdenk
2449c609719bSwdenk	   It may also save flash memory if you decide to use this
2450c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
2451c609719bSwdenk	   since then the remainder of the flash sector could be used
2452c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
2453c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
2454c609719bSwdenk	   updating the environment in flash makes it always
2455c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
2456c609719bSwdenk	   wrong before the contents has been restored from a copy in
2457c609719bSwdenk	   RAM, your target system will be dead.
2458c609719bSwdenk
24590e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
24600e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
2461c609719bSwdenk
2462c609719bSwdenk	   These settings describe a second storage area used to hold
246311ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
24643e38691eSwdenk	   a valid backup copy in case there is a power failure during
2465c609719bSwdenk	   a "saveenv" operation.
2466c609719bSwdenk
2467c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
2468c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
2469c609719bSwdenkaccordingly!
2470c609719bSwdenk
2471c609719bSwdenk
24729314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
2473c609719bSwdenk
2474c609719bSwdenk	Define this if you have some non-volatile memory device
2475c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
2476c609719bSwdenk	environment.
2477c609719bSwdenk
24780e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
24790e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2480c609719bSwdenk
248111ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
2482c609719bSwdenk	  want to use for environment. It is assumed that this memory
2483c609719bSwdenk	  can just be read and written to, without any special
2484c609719bSwdenk	  provision.
2485c609719bSwdenk
2486c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
2487c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
248811ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
2489c609719bSwdenkU-Boot will hang.
2490c609719bSwdenk
2491c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
2492c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
2493c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
2494c609719bSwdenkto save the current settings.
2495c609719bSwdenk
2496c609719bSwdenk
2497bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
2498c609719bSwdenk
2499c609719bSwdenk	Use this if you have an EEPROM or similar serial access
2500c609719bSwdenk	device and a driver for it.
2501c609719bSwdenk
25020e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
25030e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2504c609719bSwdenk
2505c609719bSwdenk	  These two #defines specify the offset and size of the
2506c609719bSwdenk	  environment area within the total memory of your EEPROM.
2507c609719bSwdenk
25086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
2509c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
2510c609719bSwdenk	  The default address is zero.
2511c609719bSwdenk
25126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
2513c609719bSwdenk	  If defined, the number of bits used to address bytes in a
2514c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
2515c609719bSwdenk	  would require six bits.
2516c609719bSwdenk
25176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
2518c609719bSwdenk	  If defined, the number of milliseconds to delay between
2519c609719bSwdenk	  page writes.	The default is zero milliseconds.
2520c609719bSwdenk
25216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
2522c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
2523c609719bSwdenk	  that this is NOT the chip address length!
2524c609719bSwdenk
25256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
25265cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
25275cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
25285cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
25295cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
25305cf91d6bSwdenk	  byte chips.
25315cf91d6bSwdenk
25325cf91d6bSwdenk	  Note that we consider the length of the address field to
25335cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
25345cf91d6bSwdenk	  in the chip address.
25355cf91d6bSwdenk
25366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
2537c609719bSwdenk	  The size in bytes of the EEPROM device.
2538c609719bSwdenk
2539548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
2540548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
2541548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
2542548738b4SHeiko Schocher
2543548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
2544548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
2545548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
2546548738b4SHeiko Schocher	  EEPROM. For example:
2547548738b4SHeiko Schocher
2548548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
2549548738b4SHeiko Schocher
2550548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
2551548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
2552c609719bSwdenk
2553057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
25545779d8d9Swdenk
25555779d8d9Swdenk	Define this if you have a DataFlash memory device which you
25565779d8d9Swdenk	want to use for the environment.
25575779d8d9Swdenk
25580e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
25590e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
25600e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
25615779d8d9Swdenk
25625779d8d9Swdenk	  These three #defines specify the offset and size of the
25635779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
25645779d8d9Swdenk	  at the specified address.
25655779d8d9Swdenk
256651bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
256713a5695bSwdenk
256813a5695bSwdenk	Define this if you have a NAND device which you want to use
256913a5695bSwdenk	for the environment.
257013a5695bSwdenk
25710e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
25720e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
257313a5695bSwdenk
257413a5695bSwdenk	  These two #defines specify the offset and size of the environment
2575fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
2576fdd813deSScott Wood	  aligned to an erase block boundary.
25775779d8d9Swdenk
2578fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
2579e443c944SMarkus Klotzbuecher
25800e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
2581fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
2582fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
2583fdd813deSScott Wood	  during a "saveenv" operation.  CONFIG_ENV_OFFSET_RENDUND must be
2584fdd813deSScott Wood	  aligned to an erase block boundary.
2585e443c944SMarkus Klotzbuecher
2586fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
2587fdd813deSScott Wood
2588fdd813deSScott Wood	  Specifies the length of the region in which the environment
2589fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
2590fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
2591fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
2592fdd813deSScott Wood	  the range to be avoided.
2593fdd813deSScott Wood
2594fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
2595fdd813deSScott Wood
2596fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
2597fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
2598fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
2599fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
2600fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
2601e443c944SMarkus Klotzbuecher
2602b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
2603b74ab737SGuennadi Liakhovetski
2604b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
2605b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
2606b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
2607b74ab737SGuennadi Liakhovetski
26086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
2609c609719bSwdenk
2610c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
2611c609719bSwdenk	area is used at an early stage (ROM part) if the environment
2612c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
2613c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
2614c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2615c609719bSwdenk	to be a good choice since it makes it far enough from the
2616c609719bSwdenk	start of the data area as well as from the stack pointer.
2617c609719bSwdenk
2618e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
2619c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
2620cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
2621c609719bSwdenkuntil then to read environment variables.
2622c609719bSwdenk
262385ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
262485ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
262585ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
262685ec0bccSwdenknecessary, because the first environment variable we need is the
262785ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
262885ec0bccSwdenkhave any device yet where we could complain.]
2629c609719bSwdenk
2630c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
2631c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
263285ec0bccSwdenkuse the "saveenv" command to store a valid environment.
2633c609719bSwdenk
26346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
2635fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
2636fc3e2165Swdenk
26376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
2638fc3e2165Swdenk		      also needs to be defined.
2639fc3e2165Swdenk
26406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
2641fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
2642c609719bSwdenk
2643f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
2644f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
2645f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
2646f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
2647f5675aa5SRon Madrid		space for already greatly restricted images, including but not
2648f5675aa5SRon Madrid		limited to NAND_SPL configurations.
2649f5675aa5SRon Madrid
2650c609719bSwdenkLow Level (hardware related) configuration options:
2651dc7c9a1aSwdenk---------------------------------------------------
2652c609719bSwdenk
26536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
2654c609719bSwdenk		Cache Line Size of the CPU.
2655c609719bSwdenk
26566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
2657c609719bSwdenk		Default address of the IMMR after system reset.
26582535d602Swdenk
26592535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
26602535d602Swdenk		and RPXsuper) to be able to adjust the position of
26612535d602Swdenk		the IMMR register after a reset.
2662c609719bSwdenk
26637f6c2cbcSwdenk- Floppy Disk Support:
26646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
26657f6c2cbcSwdenk
26667f6c2cbcSwdenk		the default drive number (default value 0)
26677f6c2cbcSwdenk
26686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
26697f6c2cbcSwdenk
267011ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
26717f6c2cbcSwdenk		(default value 1)
26727f6c2cbcSwdenk
26736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
26747f6c2cbcSwdenk
26757f6c2cbcSwdenk		defines the offset of register from address. It
26767f6c2cbcSwdenk		depends on which part of the data bus is connected to
267711ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
26787f6c2cbcSwdenk
26796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
26806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
26817f6c2cbcSwdenk		default value.
26827f6c2cbcSwdenk
26836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
26847f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
26857f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
26867f6c2cbcSwdenk		source code. It is used to make hardware dependant
26877f6c2cbcSwdenk		initializations.
26887f6c2cbcSwdenk
26896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
269025d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
269125d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
2692c609719bSwdenk
26936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
2694c609719bSwdenk
26957152b1d0Swdenk		Start address of memory area that can be used for
2696c609719bSwdenk		initial data and stack; please note that this must be
2697c609719bSwdenk		writable memory that is working WITHOUT special
2698c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
2699c609719bSwdenk		will become available only after programming the
2700c609719bSwdenk		memory controller and running certain initialization
2701c609719bSwdenk		sequences.
2702c609719bSwdenk
2703c609719bSwdenk		U-Boot uses the following memory types:
2704c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2705c609719bSwdenk		- MPC824X: data cache
2706c609719bSwdenk		- PPC4xx:  data cache
2707c609719bSwdenk
27086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
2709c609719bSwdenk
2710c609719bSwdenk		Offset of the initial data structure in the memory
27116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
27126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
2713c609719bSwdenk		data is located at the end of the available space
2714553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
27156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
27166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
27176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
2718c609719bSwdenk
2719c609719bSwdenk	Note:
2720c609719bSwdenk		On the MPC824X (or other systems that use the data
2721c609719bSwdenk		cache for initial memory) the address chosen for
27226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
2723c609719bSwdenk		point to an otherwise UNUSED address space between
2724c609719bSwdenk		the top of RAM and the start of the PCI space.
2725c609719bSwdenk
27266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
2727c609719bSwdenk
27286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
2729c609719bSwdenk
27306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
2731c609719bSwdenk
27326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
2733c609719bSwdenk
27346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
2735c609719bSwdenk
27366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
2737c609719bSwdenk
27386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
2739c609719bSwdenk		SDRAM timing
2740c609719bSwdenk
27416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
2742c609719bSwdenk		periodic timer for refresh
2743c609719bSwdenk
27446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
2745c609719bSwdenk
27466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
27476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
27486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
27496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
2750c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2751c609719bSwdenk
2752c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
27536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
27546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
2755c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2756c609719bSwdenk
27576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
27586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
2759c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
2760c609719bSwdenk		Prescaler definitions (SDRAM timing)
2761c609719bSwdenk
27626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
2763c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
2764c609719bSwdenk		define relocation offset in DPRAM [DSP2]
2765c609719bSwdenk
27666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
2767b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
2768b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
2769b423d055SHeiko Schocher
27706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
2771c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
2772c609719bSwdenk		define relocation offset in DPRAM [SCC4]
2773c609719bSwdenk
27746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
2775c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
2776c609719bSwdenk		wrong setting might damage your board. Read
2777c609719bSwdenk		doc/README.MBX before setting this variable!
2778c609719bSwdenk
27796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
2780ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
2781ea909b76Swdenk		(Power On Self Tests). This definition overrides
2782ea909b76Swdenk		#define'd default value in commproc.h resp.
2783ea909b76Swdenk		cpm_8260.h.
2784ea909b76Swdenk
27856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
27866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
27876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
27886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
27896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
27906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
27916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
27926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
2793a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
27945d232d0eSwdenk
27959cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
27969cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
27979cacf4fcSDirk Eibach		required.
27989cacf4fcSDirk Eibach
2799a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
2800a09b9b68SKumar Gala		Chip has SRIO or not
2801a09b9b68SKumar Gala
2802a09b9b68SKumar Gala- CONFIG_SRIO1:
2803a09b9b68SKumar Gala		Board has SRIO 1 port available
2804a09b9b68SKumar Gala
2805a09b9b68SKumar Gala- CONFIG_SRIO2:
2806a09b9b68SKumar Gala		Board has SRIO 2 port available
2807a09b9b68SKumar Gala
2808a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
2809a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
2810a09b9b68SKumar Gala
2811a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
2812a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
2813a09b9b68SKumar Gala
2814a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
2815a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
2816a09b9b68SKumar Gala
2817bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
2818218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
2819218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
2820218ca724SWolfgang Denk
2821bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
2822bb99ad6dSBen Warren		I2C address of the SPD EEPROM
2823bb99ad6dSBen Warren
28246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
2825218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
2826218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
2827218ca724SWolfgang Denk		to something your driver can deal with.
2828bb99ad6dSBen Warren
28296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
2830218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
2831218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
28322ad6b513STimur Tabi
2833c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
2834c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
2835c26e454dSwdenk
2836c26e454dSwdenk- CONFIG_FEC[12]_PHY
2837c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
28386e592385Swdenk		to the given FEC; i. e.
2839c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
2840c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
2841c26e454dSwdenk
2842c26e454dSwdenk		When set to -1, means to probe for first available.
2843c26e454dSwdenk
2844c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
2845c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
2846c26e454dSwdenk		(so program the FEC to ignore it).
2847c26e454dSwdenk
2848c26e454dSwdenk- CONFIG_RMII
2849c26e454dSwdenk		Enable RMII mode for all FECs.
2850c26e454dSwdenk		Note that this is a global option, we can't
2851c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
2852c26e454dSwdenk
28535cf91d6bSwdenk- CONFIG_CRC32_VERIFY
28545cf91d6bSwdenk		Add a verify option to the crc32 command.
28555cf91d6bSwdenk		The syntax is:
28565cf91d6bSwdenk
28575cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
28585cf91d6bSwdenk
28595cf91d6bSwdenk		Where address/count indicate a memory area
28605cf91d6bSwdenk		and crc32 is the correct crc32 which the
28615cf91d6bSwdenk		area should have.
28625cf91d6bSwdenk
286356523f12Swdenk- CONFIG_LOOPW
286456523f12Swdenk		Add the "loopw" memory command. This only takes effect if
2865602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
286656523f12Swdenk
28677b466641Sstroese- CONFIG_MX_CYCLIC
28687b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
28697b466641Sstroese		"md/mw" commands.
28707b466641Sstroese		Examples:
28717b466641Sstroese
28727b466641Sstroese		=> mdc.b 10 4 500
28737b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
28747b466641Sstroese
28757b466641Sstroese		=> mwc.l 100 12345678 10
28767b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
28777b466641Sstroese
28787b466641Sstroese		This only takes effect if the memory commands are activated
2879602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
28807b466641Sstroese
28818aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
2882e03f3169SWolfgang Denk		[ARM only] If this variable is defined, then certain
2883e03f3169SWolfgang Denk		low level initializations (like setting up the memory
2884e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
2885e03f3169SWolfgang Denk		relocate itself into RAM.
28868aa1a2d1Swdenk
2887e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
2888e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
2889e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
2890e03f3169SWolfgang Denk		these initializations itself.
28918aa1a2d1Swdenk
2892df81238bSMagnus Lilja- CONFIG_PRELOADER
2893df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
2894df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
2895df81238bSMagnus Lilja		compiling a NAND SPL.
2896400558b5Swdenk
2897c609719bSwdenkBuilding the Software:
2898c609719bSwdenk======================
2899c609719bSwdenk
2900218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
2901218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
2902218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
2903218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
2904218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
2905218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
2906c609719bSwdenk
2907218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
2908218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
2909218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
2910218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
2911218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
2912c609719bSwdenk
2913218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
2914218ca724SWolfgang Denk	$ export CROSS_COMPILE
2915c609719bSwdenk
29162f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
29172f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
29182f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
29192f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
29202f8d396bSPeter Tyser
29212f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
29222f8d396bSPeter Tyser
29232f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
29242f8d396bSPeter Tyser      be executed on computers running Windows.
29252f8d396bSPeter Tyser
2926c609719bSwdenkU-Boot is intended to be simple to build. After installing the
2927c609719bSwdenksources you must configure U-Boot for one specific board type. This
2928c609719bSwdenkis done by typing:
2929c609719bSwdenk
2930c609719bSwdenk	make NAME_config
2931c609719bSwdenk
2932218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
2933218ca724SWolfgang Denkrations; see the main Makefile for supported names.
293454387ac9Swdenk
2935c609719bSwdenkNote: for some board special configuration names may exist; check if
2936c609719bSwdenk      additional information is available from the board vendor; for
29372729af9dSwdenk      instance, the TQM823L systems are available without (standard)
29382729af9dSwdenk      or with LCD support. You can select such additional "features"
293911ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
2940c609719bSwdenk
29412729af9dSwdenk      make TQM823L_config
29422729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
2943c609719bSwdenk
2944c609719bSwdenk      make TQM823L_LCD_config
2945c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
2946c609719bSwdenk
2947c609719bSwdenk      etc.
2948c609719bSwdenk
2949c609719bSwdenk
2950c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
29517152b1d0Swdenkimages ready for download to / installation on your system:
2952c609719bSwdenk
2953c609719bSwdenk- "u-boot.bin" is a raw binary image
2954c609719bSwdenk- "u-boot" is an image in ELF binary format
2955c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
2956c609719bSwdenk
2957baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
2958baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
2959baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
2960baf31249SMarian Balakowicz
2961baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
2962baf31249SMarian Balakowicz
2963baf31249SMarian Balakowicz	make O=/tmp/build distclean
2964baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
2965baf31249SMarian Balakowicz	make O=/tmp/build all
2966baf31249SMarian Balakowicz
2967baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
2968baf31249SMarian Balakowicz
2969baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
2970baf31249SMarian Balakowicz	make distclean
2971baf31249SMarian Balakowicz	make NAME_config
2972baf31249SMarian Balakowicz	make all
2973baf31249SMarian Balakowicz
2974baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
2975baf31249SMarian Balakowiczvariable.
2976baf31249SMarian Balakowicz
2977c609719bSwdenk
2978c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
2979c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
2980c609719bSwdenknative "make".
2981c609719bSwdenk
2982c609719bSwdenk
2983c609719bSwdenkIf the system board that you have is not listed, then you will need
2984c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
2985c609719bSwdenksteps:
2986c609719bSwdenk
2987c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
298885ec0bccSwdenk    "Makefile" and to the "MAKEALL" script, using the existing
298985ec0bccSwdenk    entries as examples. Note that here and at many other places
29907152b1d0Swdenk    boards and other names are listed in alphabetical sort order. Please
299185ec0bccSwdenk    keep this order.
2992c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
299385ec0bccSwdenk    files you need. In your board directory, you will need at least
299485ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
299585ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
299685ec0bccSwdenk    your board
2997c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
2998c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
299985ec0bccSwdenk4.  Run "make <board>_config" with your new name.
3000c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
3001c609719bSwdenk    to be installed on your target system.
300285ec0bccSwdenk6.  Debug and solve any problems that might arise.
3003c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
3004c609719bSwdenk
3005c609719bSwdenk
3006c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
3007c609719bSwdenk==============================================================
3008c609719bSwdenk
3009c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
3010c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
3011c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
3012c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
3013218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
3014c609719bSwdenk
3015c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
3016c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
3017c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
3018c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
3019c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
30207152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
3021218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
3022218ca724SWolfgang Denkyou can type
3023c609719bSwdenk
3024c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
3025c609719bSwdenk
3026c609719bSwdenkor to build on a native PowerPC system you can type
3027c609719bSwdenk
3028c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
3029c609719bSwdenk
3030218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
3031218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
3032218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
3033218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
3034218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
3035218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
3036218ca724SWolfgang Denkvariable. For example:
3037baf31249SMarian Balakowicz
3038baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3039baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
3040baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
3041baf31249SMarian Balakowicz
3042218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
3043218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
3044218ca724SWolfgang Denkduring the whole build process.
3045baf31249SMarian Balakowicz
3046baf31249SMarian Balakowicz
3047c609719bSwdenkSee also "U-Boot Porting Guide" below.
3048c609719bSwdenk
3049c609719bSwdenk
3050c609719bSwdenkMonitor Commands - Overview:
3051c609719bSwdenk============================
3052c609719bSwdenk
3053c609719bSwdenkgo	- start application at address 'addr'
3054c609719bSwdenkrun	- run commands in an environment variable
3055c609719bSwdenkbootm	- boot application image from memory
3056c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
3057c609719bSwdenktftpboot- boot image via network using TFTP protocol
3058c609719bSwdenk	       and env variables "ipaddr" and "serverip"
3059c609719bSwdenk	       (and eventually "gatewayip")
3060c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
3061c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
3062c609719bSwdenkloads	- load S-Record file over serial line
3063c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
3064c609719bSwdenkmd	- memory display
3065c609719bSwdenkmm	- memory modify (auto-incrementing)
3066c609719bSwdenknm	- memory modify (constant address)
3067c609719bSwdenkmw	- memory write (fill)
3068c609719bSwdenkcp	- memory copy
3069c609719bSwdenkcmp	- memory compare
3070c609719bSwdenkcrc32	- checksum calculation
30710f89c54bSPeter Tyseri2c	- I2C sub-system
3072c609719bSwdenksspi	- SPI utility commands
3073c609719bSwdenkbase	- print or set address offset
3074c609719bSwdenkprintenv- print environment variables
3075c609719bSwdenksetenv	- set environment variables
3076c609719bSwdenksaveenv - save environment variables to persistent storage
3077c609719bSwdenkprotect - enable or disable FLASH write protection
3078c609719bSwdenkerase	- erase FLASH memory
3079c609719bSwdenkflinfo	- print FLASH memory information
3080c609719bSwdenkbdinfo	- print Board Info structure
3081c609719bSwdenkiminfo	- print header information for application image
3082c609719bSwdenkconinfo - print console devices and informations
3083c609719bSwdenkide	- IDE sub-system
3084c609719bSwdenkloop	- infinite loop on address range
308556523f12Swdenkloopw	- infinite write loop on address range
3086c609719bSwdenkmtest	- simple RAM test
3087c609719bSwdenkicache	- enable or disable instruction cache
3088c609719bSwdenkdcache	- enable or disable data cache
3089c609719bSwdenkreset	- Perform RESET of the CPU
3090c609719bSwdenkecho	- echo args to console
3091c609719bSwdenkversion - print monitor version
3092c609719bSwdenkhelp	- print online help
3093c609719bSwdenk?	- alias for 'help'
3094c609719bSwdenk
3095c609719bSwdenk
3096c609719bSwdenkMonitor Commands - Detailed Description:
3097c609719bSwdenk========================================
3098c609719bSwdenk
3099c609719bSwdenkTODO.
3100c609719bSwdenk
3101c609719bSwdenkFor now: just type "help <command>".
3102c609719bSwdenk
3103c609719bSwdenk
3104c609719bSwdenkEnvironment Variables:
3105c609719bSwdenk======================
3106c609719bSwdenk
3107c609719bSwdenkU-Boot supports user configuration using Environment Variables which
3108c609719bSwdenkcan be made persistent by saving to Flash memory.
3109c609719bSwdenk
3110c609719bSwdenkEnvironment Variables are set using "setenv", printed using
3111c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
3112c609719bSwdenkwithout a value can be used to delete a variable from the
3113c609719bSwdenkenvironment. As long as you don't save the environment you are
3114c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
3115c609719bSwdenkenvironment is erased by accident, a default environment is provided.
3116c609719bSwdenk
3117c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
3118c96f86eeSWolfgang Denk
3119c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
3120c609719bSwdenk
3121c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
3122c609719bSwdenk
3123c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
3124c609719bSwdenk
3125c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
3126c609719bSwdenk
3127c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
3128c609719bSwdenk
3129c609719bSwdenk  bootfile	- Name of the image to load with TFTP
3130c609719bSwdenk
31317d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
31327d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
31337d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
31347d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
31357d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
31367d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
31376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ.
31387d721e34SBartlomiej Sieka
31397d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
31407d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
31417d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
31427d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
31437d721e34SBartlomiej Sieka		  environment variable.
31447d721e34SBartlomiej Sieka
31454bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
31464bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
31474bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
31484bae9090SBartlomiej Sieka
3149c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
3150c609719bSwdenk		  "bootp" will just load perform a lookup of the
3151c609719bSwdenk		  configuration from the BOOTP server, but not try to
3152c609719bSwdenk		  load any image using TFTP
3153c609719bSwdenk
3154c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
3155c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
3156c609719bSwdenk		  be automatically started (by internally calling
3157c609719bSwdenk		  "bootm")
3158c609719bSwdenk
31594a6fd34bSwdenk		  If set to "no", a standalone image passed to the
31604a6fd34bSwdenk		  "bootm" command will be copied to the load address
31614a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
31624a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
31634a6fd34bSwdenk		  data.
31644a6fd34bSwdenk
316517ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
316617ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
316717ea1177Swdenk		  mode (400kHZ). This environment variable is used in
316817ea1177Swdenk		  initialization code. So, for changes to be effective
316917ea1177Swdenk		  it must be saved and board must be reset.
317017ea1177Swdenk
3171c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
3172c609719bSwdenk		  If this variable is not set, initrd images will be
3173c609719bSwdenk		  copied to the highest possible address in RAM; this
3174c609719bSwdenk		  is usually what you want since it allows for
3175c609719bSwdenk		  maximum initrd size. If for some reason you want to
3176c609719bSwdenk		  make sure that the initrd image is loaded below the
31776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
3178c609719bSwdenk		  variable to a value of "no" or "off" or "0".
3179c609719bSwdenk		  Alternatively, you can set it to a maximum upper
3180c609719bSwdenk		  address to use (U-Boot will still check that it
3181c609719bSwdenk		  does not overwrite the U-Boot stack and data).
3182c609719bSwdenk
3183c609719bSwdenk		  For instance, when you have a system with 16 MB
31847152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
3185c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
3186c609719bSwdenk		  the "bootargs" variable. However, now you must make
31877152b1d0Swdenk		  sure that the initrd image is placed in the first
3188c609719bSwdenk		  12 MB as well - this can be done with
3189c609719bSwdenk
3190c609719bSwdenk		  setenv initrd_high 00c00000
3191c609719bSwdenk
319238b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
319338b99261Swdenk		  indication to U-Boot that all addresses are legal
319438b99261Swdenk		  for the Linux kernel, including addresses in flash
319538b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
319638b99261Swdenk		  ramdisk at all. This may be useful to reduce the
319738b99261Swdenk		  boot time on your system, but requires that this
319838b99261Swdenk		  feature is supported by your Linux kernel.
319938b99261Swdenk
3200c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
3201c609719bSwdenk
3202c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
3203dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
3204c609719bSwdenk
3205c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
3206c609719bSwdenk
3207c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
3208c609719bSwdenk
3209c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
3210c609719bSwdenk
3211c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
3212c609719bSwdenk
3213c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
3214c609719bSwdenk
3215a3d991bdSwdenk  ethprime	- When CONFIG_NET_MULTI is enabled controls which
3216a3d991bdSwdenk		  interface is used first.
3217a3d991bdSwdenk
3218a3d991bdSwdenk  ethact	- When CONFIG_NET_MULTI is enabled controls which
3219a3d991bdSwdenk		  interface is currently active. For example you
3220a3d991bdSwdenk		  can do the following
3221a3d991bdSwdenk
322248690d80SHeiko Schocher		  => setenv ethact FEC
322348690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
322448690d80SHeiko Schocher		  => setenv ethact SCC
322548690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
3226a3d991bdSwdenk
3227e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
3228e1692577SMatthias Fuchs		  available network interfaces.
3229e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
3230e1692577SMatthias Fuchs
3231a3d991bdSwdenk  netretry	- When set to "no" each network operation will
3232a3d991bdSwdenk		  either succeed or fail without retrying.
32336e592385Swdenk		  When set to "once" the network operation will
32346e592385Swdenk		  fail when all the available network interfaces
32356e592385Swdenk		  are tried once without success.
3236a3d991bdSwdenk		  Useful on scripts which control the retry operation
3237a3d991bdSwdenk		  themselves.
3238a3d991bdSwdenk
3239b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
3240a1cf027aSJean-Christophe PLAGNIOL-VILLARD
324128cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
3242ecb0ccd9SWolfgang Denk		  UDP source port.
3243ecb0ccd9SWolfgang Denk
324428cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
324528cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
324628cb9375SWolfgang Denk
3247c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
3248c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
3249c96f86eeSWolfgang Denk
3250c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
3251c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
3252c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
3253c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
3254c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
3255c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
3256c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
3257c96f86eeSWolfgang Denk
3258a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
325911ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
3260a3d991bdSwdenk		  VLAN tagged frames.
3261c609719bSwdenk
3262c609719bSwdenkThe following environment variables may be used and automatically
3263c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
3264c609719bSwdenkdepending the information provided by your boot server:
3265c609719bSwdenk
3266c609719bSwdenk  bootfile	- see above
3267c609719bSwdenk  dnsip		- IP address of your Domain Name Server
3268fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
3269c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
3270c609719bSwdenk  hostname	- Target hostname
3271c609719bSwdenk  ipaddr	- see above
3272c609719bSwdenk  netmask	- Subnet Mask
3273c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
3274c609719bSwdenk  serverip	- see above
3275c609719bSwdenk
3276c609719bSwdenk
3277c609719bSwdenkThere are two special Environment Variables:
3278c609719bSwdenk
3279c609719bSwdenk  serial#	- contains hardware identification information such
3280c609719bSwdenk		  as type string and/or serial number
3281c609719bSwdenk  ethaddr	- Ethernet address
3282c609719bSwdenk
3283c609719bSwdenkThese variables can be set only once (usually during manufacturing of
3284c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
3285c609719bSwdenkonce they have been set once.
3286c609719bSwdenk
3287c609719bSwdenk
3288c1551ea8SstroeseFurther special Environment Variables:
3289c1551ea8Sstroese
3290c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
3291c1551ea8Sstroese		  with the "version" command. This variable is
3292c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
3293c1551ea8Sstroese
3294c1551ea8Sstroese
3295c609719bSwdenkPlease note that changes to some configuration parameters may take
3296c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
3297c609719bSwdenk
3298c609719bSwdenk
3299f07771ccSwdenkCommand Line Parsing:
3300f07771ccSwdenk=====================
3301f07771ccSwdenk
3302f07771ccSwdenkThere are two different command line parsers available with U-Boot:
33037152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
3304f07771ccSwdenk
3305f07771ccSwdenkOld, simple command line parser:
3306f07771ccSwdenk--------------------------------
3307f07771ccSwdenk
3308f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
3309f07771ccSwdenk- several commands on one line, separated by ';'
3310fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
3311f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
3312f07771ccSwdenk  for example:
3313fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
3314f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
3315f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
3316f07771ccSwdenk
3317f07771ccSwdenkHush shell:
3318f07771ccSwdenk-----------
3319f07771ccSwdenk
3320f07771ccSwdenk- similar to Bourne shell, with control structures like
3321f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
3322f07771ccSwdenk  until...do...done, ...
3323f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
3324f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
3325f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
3326f07771ccSwdenk  command
3327f07771ccSwdenk
3328f07771ccSwdenkGeneral rules:
3329f07771ccSwdenk--------------
3330f07771ccSwdenk
3331f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
3332f07771ccSwdenk    command) contains several commands separated by semicolon, and
3333f07771ccSwdenk    one of these commands fails, then the remaining commands will be
3334f07771ccSwdenk    executed anyway.
3335f07771ccSwdenk
3336f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
333711ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
3338f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
3339f07771ccSwdenk    variables are not executed.
3340f07771ccSwdenk
3341c609719bSwdenkNote for Redundant Ethernet Interfaces:
3342c609719bSwdenk=======================================
3343c609719bSwdenk
334411ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
3345c609719bSwdenksuch configurations and is capable of automatic selection of a
33467152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
3347c609719bSwdenk
3348c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
3349c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3350c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
3351c609719bSwdenk
3352c609719bSwdenkIf the network interface stores some valid MAC address (for instance
3353c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
3354c609719bSwdenkding setting in the environment; if the corresponding environment
3355c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
3356c609719bSwdenk
3357c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
3358c609719bSwdenk  environment, the SROM's address is used.
3359c609719bSwdenk
3360c609719bSwdenko If there is no valid address in the SROM, and a definition in the
3361c609719bSwdenk  environment exists, then the value from the environment variable is
3362c609719bSwdenk  used.
3363c609719bSwdenk
3364c609719bSwdenko If both the SROM and the environment contain a MAC address, and
3365c609719bSwdenk  both addresses are the same, this MAC address is used.
3366c609719bSwdenk
3367c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
3368c609719bSwdenk  addresses differ, the value from the environment is used and a
3369c609719bSwdenk  warning is printed.
3370c609719bSwdenk
3371c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
3372c609719bSwdenk  is raised.
3373c609719bSwdenk
3374ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
3375ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.  This
3376ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
3377ecee9324SBen WarrenThe naming convention is as follows:
3378ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
3379c609719bSwdenk
3380c609719bSwdenkImage Formats:
3381c609719bSwdenk==============
3382c609719bSwdenk
33833310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
33843310c549SMarian Balakowiczimages in two formats:
33853310c549SMarian Balakowicz
33863310c549SMarian BalakowiczNew uImage format (FIT)
33873310c549SMarian Balakowicz-----------------------
33883310c549SMarian Balakowicz
33893310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
33903310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
33913310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
33923310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
33933310c549SMarian Balakowicz
33943310c549SMarian Balakowicz
33953310c549SMarian BalakowiczOld uImage format
33963310c549SMarian Balakowicz-----------------
33973310c549SMarian Balakowicz
33983310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
33993310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
34003310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
3401c609719bSwdenk
3402c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3403c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
3404f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
3405f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
3406f5ed9e39SPeter Tyser  INTEGRITY).
34077b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
34081117cbf2SThomas Chou  IA64, MIPS, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
34091117cbf2SThomas Chou  Currently supported: ARM, AVR32, Intel x86, MIPS, Nios II, PowerPC).
3410c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
3411c609719bSwdenk* Load Address
3412c609719bSwdenk* Entry Point
3413c609719bSwdenk* Image Name
3414c609719bSwdenk* Image Timestamp
3415c609719bSwdenk
3416c609719bSwdenkThe header is marked by a special Magic Number, and both the header
3417c609719bSwdenkand the data portions of the image are secured against corruption by
3418c609719bSwdenkCRC32 checksums.
3419c609719bSwdenk
3420c609719bSwdenk
3421c609719bSwdenkLinux Support:
3422c609719bSwdenk==============
3423c609719bSwdenk
3424c609719bSwdenkAlthough U-Boot should support any OS or standalone application
34257152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
3426c609719bSwdenkU-Boot.
3427c609719bSwdenk
3428c609719bSwdenkU-Boot includes many features that so far have been part of some
3429c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
3430c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
3431c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
34327152b1d0Swdenkserves several purposes:
3433c609719bSwdenk
3434c609719bSwdenk- the same features can be used for other OS or standalone
3435c609719bSwdenk  applications (for instance: using compressed images to reduce the
3436c609719bSwdenk  Flash memory footprint)
3437c609719bSwdenk
3438c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
34397152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
3440c609719bSwdenk
3441c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
3442c609719bSwdenk  images; of course this also means that different kernel images can
3443c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
3444c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
3445c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
3446c609719bSwdenk  software is easier now.
3447c609719bSwdenk
3448c609719bSwdenk
3449c609719bSwdenkLinux HOWTO:
3450c609719bSwdenk============
3451c609719bSwdenk
3452c609719bSwdenkPorting Linux to U-Boot based systems:
3453c609719bSwdenk---------------------------------------
3454c609719bSwdenk
3455c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
3456c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
3457c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
3458c609719bSwdenkLinux :-).
3459c609719bSwdenk
3460a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
3461c609719bSwdenk
3462c609719bSwdenkJust make sure your machine specific header file (for instance
3463c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
34641dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
34651dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
34666d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
3467c609719bSwdenk
3468c609719bSwdenk
3469c609719bSwdenkConfiguring the Linux kernel:
3470c609719bSwdenk-----------------------------
3471c609719bSwdenk
3472c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
3473c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
3474c609719bSwdenk
3475c609719bSwdenk
3476c609719bSwdenkBuilding a Linux Image:
3477c609719bSwdenk-----------------------
3478c609719bSwdenk
347924ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
348024ee89b9Swdenknot used. If you use recent kernel source, a new build target
348124ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
348224ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
348324ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
348424ee89b9Swdenk100% compatible format.
3485c609719bSwdenk
3486c609719bSwdenkExample:
3487c609719bSwdenk
3488c609719bSwdenk	make TQM850L_config
3489c609719bSwdenk	make oldconfig
3490c609719bSwdenk	make dep
349124ee89b9Swdenk	make uImage
3492c609719bSwdenk
349324ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
349424ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
349524ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
3496c609719bSwdenk
349724ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
349824ee89b9Swdenk
349924ee89b9Swdenk* convert the kernel into a raw binary image:
350024ee89b9Swdenk
350124ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
350224ee89b9Swdenk				 -R .note -R .comment \
350324ee89b9Swdenk				 -S vmlinux linux.bin
350424ee89b9Swdenk
350524ee89b9Swdenk* compress the binary image:
350624ee89b9Swdenk
350724ee89b9Swdenk	gzip -9 linux.bin
350824ee89b9Swdenk
350924ee89b9Swdenk* package compressed binary image for U-Boot:
351024ee89b9Swdenk
351124ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
351224ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
351324ee89b9Swdenk		-d linux.bin.gz uImage
351424ee89b9Swdenk
351524ee89b9Swdenk
351624ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
351724ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
351824ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
351924ee89b9Swdenkbyte header containing information about target architecture,
352024ee89b9Swdenkoperating system, image type, compression method, entry points, time
352124ee89b9Swdenkstamp, CRC32 checksums, etc.
352224ee89b9Swdenk
352324ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
352424ee89b9Swdenkprint the header information, or to build new images.
3525c609719bSwdenk
3526c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
3527c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
3528c609719bSwdenkchecksum verification:
3529c609719bSwdenk
3530c609719bSwdenk	tools/mkimage -l image
3531c609719bSwdenk	  -l ==> list image header information
3532c609719bSwdenk
3533c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
3534c609719bSwdenkfrom a "data file" which is used as image payload:
3535c609719bSwdenk
3536c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
3537c609719bSwdenk		      -n name -d data_file image
3538c609719bSwdenk	  -A ==> set architecture to 'arch'
3539c609719bSwdenk	  -O ==> set operating system to 'os'
3540c609719bSwdenk	  -T ==> set image type to 'type'
3541c609719bSwdenk	  -C ==> set compression type 'comp'
3542c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
3543c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
3544c609719bSwdenk	  -n ==> set image name to 'name'
3545c609719bSwdenk	  -d ==> use image data from 'datafile'
3546c609719bSwdenk
354769459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
354869459791Swdenkaddress (0x00000000), but the entry point address depends on the
354969459791Swdenkkernel version:
3550c609719bSwdenk
3551c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
355224ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
3553c609719bSwdenk
3554c609719bSwdenkSo a typical call to build a U-Boot image would read:
3555c609719bSwdenk
355624ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
355724ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
3558a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
355924ee89b9Swdenk	> examples/uImage.TQM850L
356024ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3561c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3562c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3563c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3564c609719bSwdenk	Load Address: 0x00000000
356524ee89b9Swdenk	Entry Point:  0x00000000
3566c609719bSwdenk
3567c609719bSwdenkTo verify the contents of the image (or check for corruption):
3568c609719bSwdenk
356924ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
357024ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3571c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3572c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3573c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3574c609719bSwdenk	Load Address: 0x00000000
357524ee89b9Swdenk	Entry Point:  0x00000000
3576c609719bSwdenk
3577c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
3578c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
3579c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
3580c609719bSwdenkneed to be uncompressed:
3581c609719bSwdenk
3582a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
358324ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
358424ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3585a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
358624ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
358724ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3588c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3589c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
3590c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
3591c609719bSwdenk	Load Address: 0x00000000
359224ee89b9Swdenk	Entry Point:  0x00000000
3593c609719bSwdenk
3594c609719bSwdenk
3595c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
3596c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
3597c609719bSwdenk
3598c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
3599c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
3600c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3601c609719bSwdenk	Image Name:   Simple Ramdisk Image
3602c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
3603c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
3604c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
3605c609719bSwdenk	Load Address: 0x00000000
3606c609719bSwdenk	Entry Point:  0x00000000
3607c609719bSwdenk
3608c609719bSwdenk
3609c609719bSwdenkInstalling a Linux Image:
3610c609719bSwdenk-------------------------
3611c609719bSwdenk
3612c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
3613c609719bSwdenkyou must convert the image to S-Record format:
3614c609719bSwdenk
3615c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
3616c609719bSwdenk
3617c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
3618c609719bSwdenkimage header, so the resulting S-Record file will be relative to
3619c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
3620c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
3621c609719bSwdenkcommand.
3622c609719bSwdenk
3623c609719bSwdenkExample: install the image to address 0x40100000 (which on the
3624c609719bSwdenkTQM8xxL is in the first Flash bank):
3625c609719bSwdenk
3626c609719bSwdenk	=> erase 40100000 401FFFFF
3627c609719bSwdenk
3628c609719bSwdenk	.......... done
3629c609719bSwdenk	Erased 8 sectors
3630c609719bSwdenk
3631c609719bSwdenk	=> loads 40100000
3632c609719bSwdenk	## Ready for S-Record download ...
3633c609719bSwdenk	~>examples/image.srec
3634c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3635c609719bSwdenk	...
3636c609719bSwdenk	15989 15990 15991 15992
3637c609719bSwdenk	[file transfer complete]
3638c609719bSwdenk	[connected]
3639c609719bSwdenk	## Start Addr = 0x00000000
3640c609719bSwdenk
3641c609719bSwdenk
3642c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
3643c609719bSwdenkthis includes a checksum verification so you can be sure no data
3644c609719bSwdenkcorruption happened:
3645c609719bSwdenk
3646c609719bSwdenk	=> imi 40100000
3647c609719bSwdenk
3648c609719bSwdenk	## Checking Image at 40100000 ...
3649c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3650c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3651c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3652c609719bSwdenk	   Load Address: 00000000
3653c609719bSwdenk	   Entry Point:	 0000000c
3654c609719bSwdenk	   Verifying Checksum ... OK
3655c609719bSwdenk
3656c609719bSwdenk
3657c609719bSwdenkBoot Linux:
3658c609719bSwdenk-----------
3659c609719bSwdenk
3660c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
3661c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
3662c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
3663c609719bSwdenkparameters. You can check and modify this variable using the
3664c609719bSwdenk"printenv" and "setenv" commands:
3665c609719bSwdenk
3666c609719bSwdenk
3667c609719bSwdenk	=> printenv bootargs
3668c609719bSwdenk	bootargs=root=/dev/ram
3669c609719bSwdenk
3670c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3671c609719bSwdenk
3672c609719bSwdenk	=> printenv bootargs
3673c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3674c609719bSwdenk
3675c609719bSwdenk	=> bootm 40020000
3676c609719bSwdenk	## Booting Linux kernel at 40020000 ...
3677c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
3678c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3679c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
3680c609719bSwdenk	   Load Address: 00000000
3681c609719bSwdenk	   Entry Point:	 0000000c
3682c609719bSwdenk	   Verifying Checksum ... OK
3683c609719bSwdenk	   Uncompressing Kernel Image ... OK
3684c609719bSwdenk	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
3685c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3686c609719bSwdenk	time_init: decrementer frequency = 187500000/60
3687c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
3688c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3689c609719bSwdenk	...
3690c609719bSwdenk
369111ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
36927152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
3693c609719bSwdenkformat!) to the "bootm" command:
3694c609719bSwdenk
3695c609719bSwdenk	=> imi 40100000 40200000
3696c609719bSwdenk
3697c609719bSwdenk	## Checking Image at 40100000 ...
3698c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3699c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3700c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3701c609719bSwdenk	   Load Address: 00000000
3702c609719bSwdenk	   Entry Point:	 0000000c
3703c609719bSwdenk	   Verifying Checksum ... OK
3704c609719bSwdenk
3705c609719bSwdenk	## Checking Image at 40200000 ...
3706c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
3707c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
3708c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
3709c609719bSwdenk	   Load Address: 00000000
3710c609719bSwdenk	   Entry Point:	 00000000
3711c609719bSwdenk	   Verifying Checksum ... OK
3712c609719bSwdenk
3713c609719bSwdenk	=> bootm 40100000 40200000
3714c609719bSwdenk	## Booting Linux kernel at 40100000 ...
3715c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3716c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3717c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3718c609719bSwdenk	   Load Address: 00000000
3719c609719bSwdenk	   Entry Point:	 0000000c
3720c609719bSwdenk	   Verifying Checksum ... OK
3721c609719bSwdenk	   Uncompressing Kernel Image ... OK
3722c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
3723c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
3724c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
3725c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
3726c609719bSwdenk	   Load Address: 00000000
3727c609719bSwdenk	   Entry Point:	 00000000
3728c609719bSwdenk	   Verifying Checksum ... OK
3729c609719bSwdenk	   Loading Ramdisk ... OK
3730c609719bSwdenk	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
3731c609719bSwdenk	Boot arguments: root=/dev/ram
3732c609719bSwdenk	time_init: decrementer frequency = 187500000/60
3733c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
3734c609719bSwdenk	...
3735c609719bSwdenk	RAMDISK: Compressed image found at block 0
3736c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
3737c609719bSwdenk
3738c609719bSwdenk	bash#
3739c609719bSwdenk
37400267768eSMatthew McClintockBoot Linux and pass a flat device tree:
37410267768eSMatthew McClintock-----------
37420267768eSMatthew McClintock
37430267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
37440267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
37450267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
37460267768eSMatthew McClintockflat device tree:
37470267768eSMatthew McClintock
37480267768eSMatthew McClintock=> print oftaddr
37490267768eSMatthew McClintockoftaddr=0x300000
37500267768eSMatthew McClintock=> print oft
37510267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
37520267768eSMatthew McClintock=> tftp $oftaddr $oft
37530267768eSMatthew McClintockSpeed: 1000, full duplex
37540267768eSMatthew McClintockUsing TSEC0 device
37550267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
37560267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
37570267768eSMatthew McClintockLoad address: 0x300000
37580267768eSMatthew McClintockLoading: #
37590267768eSMatthew McClintockdone
37600267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
37610267768eSMatthew McClintock=> tftp $loadaddr $bootfile
37620267768eSMatthew McClintockSpeed: 1000, full duplex
37630267768eSMatthew McClintockUsing TSEC0 device
37640267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
37650267768eSMatthew McClintockFilename 'uImage'.
37660267768eSMatthew McClintockLoad address: 0x200000
37670267768eSMatthew McClintockLoading:############
37680267768eSMatthew McClintockdone
37690267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
37700267768eSMatthew McClintock=> print loadaddr
37710267768eSMatthew McClintockloadaddr=200000
37720267768eSMatthew McClintock=> print oftaddr
37730267768eSMatthew McClintockoftaddr=0x300000
37740267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
37750267768eSMatthew McClintock## Booting image at 00200000 ...
37760267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
37770267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
37780267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
37790267768eSMatthew McClintock   Load Address: 00000000
37800267768eSMatthew McClintock   Entry Point:	 00000000
37810267768eSMatthew McClintock   Verifying Checksum ... OK
37820267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
37830267768eSMatthew McClintockBooting using flat device tree at 0x300000
37840267768eSMatthew McClintockUsing MPC85xx ADS machine description
37850267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
37860267768eSMatthew McClintock[snip]
37870267768eSMatthew McClintock
37880267768eSMatthew McClintock
37896069ff26SwdenkMore About U-Boot Image Types:
37906069ff26Swdenk------------------------------
37916069ff26Swdenk
37926069ff26SwdenkU-Boot supports the following image types:
37936069ff26Swdenk
37946069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
37956069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
37966069ff26Swdenk	well) you can continue to work in U-Boot after return from
37976069ff26Swdenk	the Standalone Program.
37986069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
37996069ff26Swdenk	will take over control completely. Usually these programs
38006069ff26Swdenk	will install their own set of exception handlers, device
38016069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
38026069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
38036069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
38046069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
38056069ff26Swdenk	being started.
38066069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
38076069ff26Swdenk	(Linux) kernel image and one or more data images like
38086069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
38096069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
38106069ff26Swdenk	server provides just a single image file, but you want to get
38116069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
38126069ff26Swdenk
38136069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
38146069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
38156069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
38166069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
38176069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
38186069ff26Swdenk	a multiple of 4 bytes).
38196069ff26Swdenk
38206069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
38216069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
38226069ff26Swdenk	flash memory.
38236069ff26Swdenk
38246069ff26Swdenk   "Script files" are command sequences that will be executed by
38256069ff26Swdenk	U-Boot's command interpreter; this feature is especially
38266069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
38276069ff26Swdenk	as command interpreter.
38286069ff26Swdenk
3829c609719bSwdenk
3830c609719bSwdenkStandalone HOWTO:
3831c609719bSwdenk=================
3832c609719bSwdenk
3833c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
3834c609719bSwdenkrun "standalone" applications, which can use some resources of
3835c609719bSwdenkU-Boot like console I/O functions or interrupt services.
3836c609719bSwdenk
3837c609719bSwdenkTwo simple examples are included with the sources:
3838c609719bSwdenk
3839c609719bSwdenk"Hello World" Demo:
3840c609719bSwdenk-------------------
3841c609719bSwdenk
3842c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
3843c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
3844c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
3845c609719bSwdenklike that:
3846c609719bSwdenk
3847c609719bSwdenk	=> loads
3848c609719bSwdenk	## Ready for S-Record download ...
3849c609719bSwdenk	~>examples/hello_world.srec
3850c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
3851c609719bSwdenk	[file transfer complete]
3852c609719bSwdenk	[connected]
3853c609719bSwdenk	## Start Addr = 0x00040004
3854c609719bSwdenk
3855c609719bSwdenk	=> go 40004 Hello World! This is a test.
3856c609719bSwdenk	## Starting application at 0x00040004 ...
3857c609719bSwdenk	Hello World
3858c609719bSwdenk	argc = 7
3859c609719bSwdenk	argv[0] = "40004"
3860c609719bSwdenk	argv[1] = "Hello"
3861c609719bSwdenk	argv[2] = "World!"
3862c609719bSwdenk	argv[3] = "This"
3863c609719bSwdenk	argv[4] = "is"
3864c609719bSwdenk	argv[5] = "a"
3865c609719bSwdenk	argv[6] = "test."
3866c609719bSwdenk	argv[7] = "<NULL>"
3867c609719bSwdenk	Hit any key to exit ...
3868c609719bSwdenk
3869c609719bSwdenk	## Application terminated, rc = 0x0
3870c609719bSwdenk
3871c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
3872c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
3873c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
3874c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
3875c609719bSwdenkcharacter, but this is just a demo program. The application can be
3876c609719bSwdenkcontrolled by the following keys:
3877c609719bSwdenk
3878c609719bSwdenk	? - print current values og the CPM Timer registers
3879c609719bSwdenk	b - enable interrupts and start timer
3880c609719bSwdenk	e - stop timer and disable interrupts
3881c609719bSwdenk	q - quit application
3882c609719bSwdenk
3883c609719bSwdenk	=> loads
3884c609719bSwdenk	## Ready for S-Record download ...
3885c609719bSwdenk	~>examples/timer.srec
3886c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
3887c609719bSwdenk	[file transfer complete]
3888c609719bSwdenk	[connected]
3889c609719bSwdenk	## Start Addr = 0x00040004
3890c609719bSwdenk
3891c609719bSwdenk	=> go 40004
3892c609719bSwdenk	## Starting application at 0x00040004 ...
3893c609719bSwdenk	TIMERS=0xfff00980
3894c609719bSwdenk	Using timer 1
3895c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
3896c609719bSwdenk
3897c609719bSwdenkHit 'b':
3898c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
3899c609719bSwdenk	Enabling timer
3900c609719bSwdenkHit '?':
3901c609719bSwdenk	[q, b, e, ?] ........
3902c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
3903c609719bSwdenkHit '?':
3904c609719bSwdenk	[q, b, e, ?] .
3905c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
3906c609719bSwdenkHit '?':
3907c609719bSwdenk	[q, b, e, ?] .
3908c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
3909c609719bSwdenkHit '?':
3910c609719bSwdenk	[q, b, e, ?] .
3911c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
3912c609719bSwdenkHit 'e':
3913c609719bSwdenk	[q, b, e, ?] ...Stopping timer
3914c609719bSwdenkHit 'q':
3915c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
3916c609719bSwdenk
3917c609719bSwdenk
391885ec0bccSwdenkMinicom warning:
391985ec0bccSwdenk================
392085ec0bccSwdenk
39217152b1d0SwdenkOver time, many people have reported problems when trying to use the
392285ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
392385ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
3924f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
392585ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
392685ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
392785ec0bccSwdenk
392852f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
392952f52c14Swdenkconfiguration to your "File transfer protocols" section:
393052f52c14Swdenk
393152f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
393252f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
393352f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
393452f52c14Swdenk
393552f52c14Swdenk
3936c609719bSwdenkNetBSD Notes:
3937c609719bSwdenk=============
3938c609719bSwdenk
3939c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
3940c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
3941c609719bSwdenk
3942c609719bSwdenkBuilding requires a cross environment; it is known to work on
3943c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
3944c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
3945c609719bSwdenkNote that the cross-powerpc package does not install include files;
3946c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
3947c609719bSwdenkmissing.  This file has to be installed and patched manually:
3948c609719bSwdenk
3949c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
3950c609719bSwdenk	# mkdir powerpc
3951c609719bSwdenk	# ln -s powerpc machine
3952c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
3953c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
3954c609719bSwdenk
3955c609719bSwdenkNative builds *don't* work due to incompatibilities between native
3956c609719bSwdenkand U-Boot include files.
3957c609719bSwdenk
3958c609719bSwdenkBooting assumes that (the first part of) the image booted is a
3959c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
3960c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
3961c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
39622a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
3963c609719bSwdenk
3964c609719bSwdenk
3965c609719bSwdenkImplementation Internals:
3966c609719bSwdenk=========================
3967c609719bSwdenk
3968c609719bSwdenkThe following is not intended to be a complete description of every
3969c609719bSwdenkimplementation detail. However, it should help to understand the
3970c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
3971c609719bSwdenkhardware.
3972c609719bSwdenk
3973c609719bSwdenk
3974c609719bSwdenkInitial Stack, Global Data:
3975c609719bSwdenk---------------------------
3976c609719bSwdenk
3977c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
3978c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
3979c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
3980c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
3981c609719bSwdenkis not initialized as zero. To be able to get a C environment working
3982c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
3983c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
3984c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
3985c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
3986c609719bSwdenklocked as (mis-) used as memory, etc.
3987c609719bSwdenk
39887152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
39890668236bSWolfgang Denk	U-Boot mailing list:
399043d9616cSwdenk
399143d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
399243d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
399343d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
399443d9616cSwdenk	...
399543d9616cSwdenk
399643d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
399743d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
399843d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
399943d9616cSwdenk	is that the cache is being used as a temporary supply of
400043d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
400111ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
400243d9616cSwdenk	can see how this works by studying the cache architecture and
400343d9616cSwdenk	operation in the architecture and processor-specific manuals.
400443d9616cSwdenk
400543d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
400643d9616cSwdenk	is another option for the system designer to use as an
400711ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
400843d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
400943d9616cSwdenk	board designers haven't used it for something that would
401043d9616cSwdenk	cause you grief during the initial boot! It is frequently not
401143d9616cSwdenk	used.
401243d9616cSwdenk
40136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
401443d9616cSwdenk	with your processor/board/system design. The default value
401543d9616cSwdenk	you will find in any recent u-boot distribution in
40168a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
401743d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
401843d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
401943d9616cSwdenk	that are supposed to respond to that address! That code in
402043d9616cSwdenk	start.S has been around a while and should work as is when
402143d9616cSwdenk	you get the config right.
402243d9616cSwdenk
402343d9616cSwdenk	-Chris Hallinan
402443d9616cSwdenk	DS4.COM, Inc.
402543d9616cSwdenk
4026c609719bSwdenkIt is essential to remember this, since it has some impact on the C
4027c609719bSwdenkcode for the initialization procedures:
4028c609719bSwdenk
4029c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
4030c609719bSwdenk  to write it.
4031c609719bSwdenk
403211ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
4033c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
40347152b1d0Swdenk  zation is performed later (when relocating to RAM).
4035c609719bSwdenk
4036c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
4037c609719bSwdenk  that.
4038c609719bSwdenk
4039c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
4040c609719bSwdenknormal global data to share information beween the code. But it
4041c609719bSwdenkturned out that the implementation of U-Boot can be greatly
4042c609719bSwdenksimplified by making a global data structure (gd_t) available to all
4043c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
4044c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
4045c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
4046c609719bSwdenkplace a pointer (gd) to the global data into a register which we
4047c609719bSwdenkreserve for this purpose.
4048c609719bSwdenk
40497152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
4050c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
4051c609719bSwdenkGCC's implementation.
4052c609719bSwdenk
4053c609719bSwdenkFor PowerPC, the following registers have specific use:
4054c609719bSwdenk	R1:	stack pointer
4055e7670f6cSWolfgang Denk	R2:	reserved for system use
4056c609719bSwdenk	R3-R4:	parameter passing and return values
4057c609719bSwdenk	R5-R10: parameter passing
4058c609719bSwdenk	R13:	small data area pointer
4059c609719bSwdenk	R30:	GOT pointer
4060c609719bSwdenk	R31:	frame pointer
4061c609719bSwdenk
4062e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
4063e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
4064e6bee808SJoakim Tjernlund	going back and forth between asm and C)
4065c609719bSwdenk
4066e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
4067c609719bSwdenk
4068c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
4069c609719bSwdenk    address of the global data structure is known at compile time),
4070c609719bSwdenk    but it turned out that reserving a register results in somewhat
4071c609719bSwdenk    smaller code - although the code savings are not that big (on
4072c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
4073c609719bSwdenk    624 text + 127 data).
4074c609719bSwdenk
4075c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
40764c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
40774c58eb55SMike Frysinger
4078c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
40794c58eb55SMike Frysinger
4080c609719bSwdenkOn ARM, the following registers are used:
4081c609719bSwdenk
4082c609719bSwdenk	R0:	function argument word/integer result
4083c609719bSwdenk	R1-R3:	function argument word
4084c609719bSwdenk	R9:	GOT pointer
4085c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
4086c609719bSwdenk	R11:	argument (frame) pointer
4087c609719bSwdenk	R12:	temporary workspace
4088c609719bSwdenk	R13:	stack pointer
4089c609719bSwdenk	R14:	link register
4090c609719bSwdenk	R15:	program counter
4091c609719bSwdenk
4092c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
4093c609719bSwdenk
40940df01fd3SThomas ChouOn Nios II, the ABI is documented here:
40950df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
40960df01fd3SThomas Chou
40970df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
40980df01fd3SThomas Chou
40990df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
41000df01fd3SThomas Chou    to access small data sections, so gp is free.
41010df01fd3SThomas Chou
4102d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
4103d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
4104c609719bSwdenk
4105c609719bSwdenkMemory Management:
4106c609719bSwdenk------------------
4107c609719bSwdenk
4108c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
4109c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
4110c609719bSwdenk
4111c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
4112c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
4113c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
4114c609719bSwdenkphysical memory banks.
4115c609719bSwdenk
4116c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
4117c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
4118c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
4119c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
41206d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
4121c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
4122c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
4123c609719bSwdenk
4124c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
4125c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
4126c609719bSwdenk
4127c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
4128c609719bSwdenkthis:
4129c609719bSwdenk
4130c609719bSwdenk	0x0000 0000	Exception Vector code
4131c609719bSwdenk	      :
4132c609719bSwdenk	0x0000 1FFF
4133c609719bSwdenk	0x0000 2000	Free for Application Use
4134c609719bSwdenk	      :
4135c609719bSwdenk	      :
4136c609719bSwdenk
4137c609719bSwdenk	      :
4138c609719bSwdenk	      :
4139c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
4140c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
4141c609719bSwdenk	0x00FC 0000	Malloc Arena
4142c609719bSwdenk	      :
4143c609719bSwdenk	0x00FD FFFF
4144c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
4145c609719bSwdenk	...		eventually: LCD or video framebuffer
4146c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
4147c609719bSwdenk	0x00FF FFFF	[End of RAM]
4148c609719bSwdenk
4149c609719bSwdenk
4150c609719bSwdenkSystem Initialization:
4151c609719bSwdenk----------------------
4152c609719bSwdenk
4153c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
415411ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
4155c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
41567152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
4157c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
4158c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
4159c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
4160c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
4161c609719bSwdenkthe caches and the SIU.
4162c609719bSwdenk
4163c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
4164c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
4165c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
4166c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
4167c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
4168c609719bSwdenksimple memory test is run that determines the size of the SDRAM
4169c609719bSwdenkbanks.
4170c609719bSwdenk
4171c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
41727152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
4173c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
4174c609719bSwdenk0x00000000, with any additional banks following immediately to create
4175c609719bSwdenkcontiguous memory starting from 0.
4176c609719bSwdenk
4177c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
4178c609719bSwdenkand allocates memory for use by malloc() and for the global Board
4179c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
4180c609719bSwdenkpages, and the final stack is set up.
4181c609719bSwdenk
4182c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
4183c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
4184c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
4185c609719bSwdenknew address in RAM.
4186c609719bSwdenk
4187c609719bSwdenk
4188c609719bSwdenkU-Boot Porting Guide:
4189c609719bSwdenk----------------------
4190c609719bSwdenk
4191c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
41926aff3115Swdenklist, October 2002]
4193c609719bSwdenk
4194c609719bSwdenk
4195c609719bSwdenkint main(int argc, char *argv[])
4196c609719bSwdenk{
4197c609719bSwdenk	sighandler_t no_more_time;
4198c609719bSwdenk
4199c609719bSwdenk	signal(SIGALRM, no_more_time);
4200c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
4201c609719bSwdenk
4202c609719bSwdenk	if (available_money > available_manpower) {
42036c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
4204c609719bSwdenk		return 0;
4205c609719bSwdenk	}
4206c609719bSwdenk
4207c609719bSwdenk	Download latest U-Boot source;
4208c609719bSwdenk
42090668236bSWolfgang Denk	Subscribe to u-boot mailing list;
42106aff3115Swdenk
42116c3fef28SJerry Van Baren	if (clueless)
4212c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
4213c609719bSwdenk
4214c609719bSwdenk	while (learning) {
4215c609719bSwdenk		Read the README file in the top level directory;
42167cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
42176c3fef28SJerry Van Baren		Read applicable doc/*.README;
4218c609719bSwdenk		Read the source, Luke;
42196c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
4220c609719bSwdenk	}
4221c609719bSwdenk
42226c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
42236c3fef28SJerry Van Baren		Buy a BDI3000;
42246c3fef28SJerry Van Baren	else
4225c609719bSwdenk		Add a lot of aggravation and time;
4226c609719bSwdenk
42276c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
42286c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
42296c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
42306c3fef28SJerry Van Baren	} else {
4231c609719bSwdenk		Create your own board support subdirectory;
42326c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
42336c3fef28SJerry Van Baren	}
42346c3fef28SJerry Van Baren	Edit new board/<myboard> files
42356c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
4236c609719bSwdenk
42376c3fef28SJerry Van Baren	while (!accepted) {
4238c609719bSwdenk		while (!running) {
4239c609719bSwdenk			do {
4240c609719bSwdenk				Add / modify source code;
4241c609719bSwdenk			} until (compiles);
4242c609719bSwdenk			Debug;
4243c609719bSwdenk			if (clueless)
4244c609719bSwdenk				email("Hi, I am having problems...");
4245c609719bSwdenk		}
42466c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
42476c3fef28SJerry Van Baren		if (reasonable critiques)
42486c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
42496c3fef28SJerry Van Baren		else
42506c3fef28SJerry Van Baren			Defend code as written;
42516c3fef28SJerry Van Baren	}
4252c609719bSwdenk
4253c609719bSwdenk	return 0;
4254c609719bSwdenk}
4255c609719bSwdenk
4256c609719bSwdenkvoid no_more_time (int sig)
4257c609719bSwdenk{
4258c609719bSwdenk      hire_a_guru();
4259c609719bSwdenk}
4260c609719bSwdenk
4261c609719bSwdenk
4262c609719bSwdenkCoding Standards:
4263c609719bSwdenk-----------------
4264c609719bSwdenk
4265c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
42662c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
42672c051651SDetlev Zundel"scripts/Lindent" in your Linux kernel source directory.  In sources
42682c051651SDetlev Zundeloriginating from U-Boot a style corresponding to "Lindent -pcs" (adding
42692c051651SDetlev Zundelspaces before parameters to function calls) is actually used.
4270c609719bSwdenk
42712c051651SDetlev ZundelSource files originating from a different project (for example the
42722c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
42732c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
42742c051651SDetlev Zundelsources.
42752c051651SDetlev Zundel
42762c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
42772c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
42782c051651SDetlev Zundelin your code.
4279c609719bSwdenk
4280c178d3daSwdenkPlease also stick to the following formatting rules:
4281180d3f74Swdenk- remove any trailing white space
4282180d3f74Swdenk- use TAB characters for indentation, not spaces
4283180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
4284180d3f74Swdenk- do not add more than 2 empty lines to source files
4285180d3f74Swdenk- do not add trailing empty lines to source files
4286180d3f74Swdenk
4287c609719bSwdenkSubmissions which do not conform to the standards may be returned
4288c609719bSwdenkwith a request to reformat the changes.
4289c609719bSwdenk
4290c609719bSwdenk
4291c609719bSwdenkSubmitting Patches:
4292c609719bSwdenk-------------------
4293c609719bSwdenk
4294c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
4295c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
4296c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
4297c609719bSwdenk
42980d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
4299218ca724SWolfgang Denk
43000668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
43010668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
43020668236bSWolfgang Denk
4303c609719bSwdenkWhen you send a patch, please include the following information with
4304c609719bSwdenkit:
4305c609719bSwdenk
4306c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
4307c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
4308c609719bSwdenk  patch actually fixes something.
4309c609719bSwdenk
4310c609719bSwdenk* For new features: a description of the feature and your
4311c609719bSwdenk  implementation.
4312c609719bSwdenk
4313c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
4314c609719bSwdenk
4315c609719bSwdenk* For major contributions, your entry to the CREDITS file
4316c609719bSwdenk
4317c609719bSwdenk* When you add support for a new board, don't forget to add this
4318c609719bSwdenk  board to the MAKEALL script, too.
4319c609719bSwdenk
4320c609719bSwdenk* If your patch adds new configuration options, don't forget to
4321c609719bSwdenk  document these in the README file.
4322c609719bSwdenk
4323218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
4324218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
4325218ca724SWolfgang Denk  "git-format-patch". If you then use "git-send-email" to send it to
4326218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
4327218ca724SWolfgang Denk  with some other mail clients.
4328c609719bSwdenk
4329218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
4330218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
4331218ca724SWolfgang Denk  GNU diff.
43326dff5529Swdenk
4333218ca724SWolfgang Denk  The current directory when running this command shall be the parent
4334218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
4335218ca724SWolfgang Denk  your patch includes sufficient directory information for the
4336218ca724SWolfgang Denk  affected files).
4337218ca724SWolfgang Denk
4338218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
4339218ca724SWolfgang Denk  and compressed attachments must not be used.
4340c609719bSwdenk
434152f52c14Swdenk* If one logical set of modifications affects or creates several
434252f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
434352f52c14Swdenk
434452f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
434552f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
434652f52c14Swdenk
434752f52c14Swdenk
4348c609719bSwdenkNotes:
4349c609719bSwdenk
4350c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
4351c609719bSwdenk  source tree and make sure that no errors or warnings are reported
4352c609719bSwdenk  for any of the boards.
4353c609719bSwdenk
4354c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
4355c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
4356c609719bSwdenk  returned with a request to re-formatting / split it.
4357c609719bSwdenk
4358c609719bSwdenk* If you modify existing code, make sure that your new code does not
4359c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
4360c609719bSwdenk  When adding new features, these should compile conditionally only
4361c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
4362c609719bSwdenk  disabled must not need more memory than the old code without your
4363c609719bSwdenk  modification.
436490dc6704Swdenk
43650668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
43660668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
43670668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
43680668236bSWolfgang Denk  bigger than the size limit should be avoided.
4369