xref: /openbmc/u-boot/README (revision 8f29084a4f020ddc2d15a0f374f08f80aa8b39a0)
1c609719bSwdenk#
26abe6fb6SDetlev Zundel# (C) Copyright 2000 - 2011
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
167fea25720SGraeme Russ  /x86			Files generic to x86 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
322cf946c6dSLei Wen- Marvell Family Member
323cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
324cf946c6dSLei Wen					  multiple fs option at one time
325cf946c6dSLei Wen					  for marvell soc family
326cf946c6dSLei Wen
327c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
328c609719bSwdenk		Define exactly one of
329c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
330c609719bSwdenk
33111ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
33266ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
33366ca92a5Swdenk					  get_gclk_freq() cannot work
3345da627a4Swdenk					  e.g. if there is no 32KHz
3355da627a4Swdenk					  reference PIT/RTC clock
33666ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
33766ca92a5Swdenk					  or XTAL/EXTAL)
338c609719bSwdenk
33966ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
34266ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
34375d1ea7fSwdenk			See doc/README.MPC866
34475d1ea7fSwdenk
3456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
34675d1ea7fSwdenk
34775d1ea7fSwdenk		Define this to measure the actual CPU clock instead
34875d1ea7fSwdenk		of relying on the correctness of the configured
34975d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
35075d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
35175d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
35375d1ea7fSwdenk
354506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
355506f3918SHeiko Schocher
356506f3918SHeiko Schocher		Define this option if you want to enable the
357506f3918SHeiko Schocher		ICache only when Code runs from RAM.
358506f3918SHeiko Schocher
35966412c63SKumar Gala- 85xx CPU Options:
36066412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
36166412c63SKumar Gala
36266412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
36366412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
36466412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
36566412c63SKumar Gala
366*8f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
367*8f29084aSKumar Gala
368*8f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
369*8f29084aSKumar Gala		tree nodes for the given platform.
370*8f29084aSKumar Gala
3710b953ffcSMarkus Klotzbuecher- Intel Monahans options:
3726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
3730b953ffcSMarkus Klotzbuecher
3740b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
3750b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
3760b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
3770b953ffcSMarkus Klotzbuecher
3786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
3790b953ffcSMarkus Klotzbuecher
3800b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
3810b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
3820b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
3830b953ffcSMarkus Klotzbuecher		by this value.
3840b953ffcSMarkus Klotzbuecher
3855da627a4Swdenk- Linux Kernel Interface:
386c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
387c609719bSwdenk
388c609719bSwdenk		U-Boot stores all clock information in Hz
389c609719bSwdenk		internally. For binary compatibility with older Linux
390c609719bSwdenk		kernels (which expect the clocks passed in the
391c609719bSwdenk		bd_info data to be in MHz) the environment variable
392c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
393c609719bSwdenk		converts clock data to MHZ before passing it to the
394c609719bSwdenk		Linux kernel.
395c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
396c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
397c609719bSwdenk		default environment.
398c609719bSwdenk
3995da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
4005da627a4Swdenk
40111ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
4025da627a4Swdenk		expect it to be in bytes, others in MB.
4035da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
4045da627a4Swdenk
405fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
406f57f70aaSWolfgang Denk
407f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
408213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
409213bf8c8SGerald Van Baren		concepts).
410213bf8c8SGerald Van Baren
411213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
412213bf8c8SGerald Van Baren		 * New libfdt-based support
413213bf8c8SGerald Van Baren		 * Adds the "fdt" command
4143bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
415213bf8c8SGerald Van Baren
416b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
417b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
418b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
419b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
420f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
421c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
422f57f70aaSWolfgang Denk
42311ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
42411ccc33fSMarcel Ziswiler		addresses
4253bb342fcSKim Phillips
4264e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
4274e253137SKumar Gala
4284e253137SKumar Gala		Board code has addition modification that it wants to make
4294e253137SKumar Gala		to the flat device tree before handing it off to the kernel
4306705d81eSwdenk
4310267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
4320267768eSMatthew McClintock
43311ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
4340267768eSMatthew McClintock		param header, the default value is zero if undefined.
4350267768eSMatthew McClintock
4363887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
4373887c3fbSHeiko Schocher
4383887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
4393887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
4403887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
4413887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
4423887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
4433887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
4443887c3fbSHeiko Schocher
4450b2f4ecaSNiklaus Giger- vxWorks boot parameters:
4460b2f4ecaSNiklaus Giger
4470b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
4480b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
4490b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
4500b2f4ecaSNiklaus Giger
4510b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
4520b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
4530b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
4540b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
4550b2f4ecaSNiklaus Giger
4560b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
4570b2f4ecaSNiklaus Giger
4580b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
4590b2f4ecaSNiklaus Giger
4600b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
4610b2f4ecaSNiklaus Giger		the defaults discussed just above.
4620b2f4ecaSNiklaus Giger
4636705d81eSwdenk- Serial Ports:
46448d0192fSAndreas Engel		CONFIG_PL010_SERIAL
4656705d81eSwdenk
4666705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
4676705d81eSwdenk
46848d0192fSAndreas Engel		CONFIG_PL011_SERIAL
4696705d81eSwdenk
4706705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
4716705d81eSwdenk
4726705d81eSwdenk		CONFIG_PL011_CLOCK
4736705d81eSwdenk
4746705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
4756705d81eSwdenk		the clock speed of the UARTs.
4766705d81eSwdenk
4776705d81eSwdenk		CONFIG_PL01x_PORTS
4786705d81eSwdenk
4796705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
4806705d81eSwdenk		define this to a list of base addresses for each (supported)
4816705d81eSwdenk		port. See e.g. include/configs/versatile.h
4826705d81eSwdenk
483910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
484910f1ae3SJohn Rigby
485910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
486910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
487910f1ae3SJohn Rigby		this variable to initialize the extra register.
488910f1ae3SJohn Rigby
489910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
490910f1ae3SJohn Rigby
491910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
492910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
493910f1ae3SJohn Rigby		variable to flush the UART at init time.
494910f1ae3SJohn Rigby
4956705d81eSwdenk
496c609719bSwdenk- Console Interface:
497c609719bSwdenk		Depending on board, define exactly one serial port
498c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
499c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
500c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
501c609719bSwdenk
502c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
503c609719bSwdenk		port routines must be defined elsewhere
504c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
505c609719bSwdenk
506c609719bSwdenk		CONFIG_CFB_CONSOLE
507c609719bSwdenk		Enables console device for a color framebuffer. Needs following
508c609719bSwdenk		defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
509c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
510c609719bSwdenk						(default big endian)
511c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
512c609719bSwdenk						rectangle fill
513c609719bSwdenk						(cf. smiLynxEM)
514c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
515c609719bSwdenk						bit-blit (cf. smiLynxEM)
516c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
517c609719bSwdenk						(cols=pitch)
518c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
519c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
520c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
521c609719bSwdenk						(0-5, cf. cfb_console.c)
522c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
523c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
524c609719bSwdenk						(i.e. i8042_kbd_init())
525c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
526c609719bSwdenk						(i.e. i8042_tstc)
527c609719bSwdenk			VIDEO_GETC_FCT		get char fct
528c609719bSwdenk						(i.e. i8042_getc)
529c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
530c609719bSwdenk						(requires blink timer
531c609719bSwdenk						cf. i8042.c)
5326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
533c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
534c609719bSwdenk						upper right corner
535602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
536c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
537c609719bSwdenk						upper left corner
538a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
539a6c7ad2fSwdenk						linux_logo.h for logo.
540a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
541c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
54211ccc33fSMarcel Ziswiler						additional board info beside
543c609719bSwdenk						the logo
544c609719bSwdenk
545c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
546c609719bSwdenk		default i/o. Serial console can be forced with
547c609719bSwdenk		environment 'console=serial'.
548c609719bSwdenk
549a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
550a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
551a3ad8e26Swdenk		the "silent" environment variable. See
552a3ad8e26Swdenk		doc/README.silent for more information.
553a3ad8e26Swdenk
554c609719bSwdenk- Console Baudrate:
555c609719bSwdenk		CONFIG_BAUDRATE - in bps
556c609719bSwdenk		Select one of the baudrates listed in
5576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
5586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
559c609719bSwdenk
560c92fac91SHeiko Schocher- Console Rx buffer length
561c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
562c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
5632b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
564c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
565c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
566c92fac91SHeiko Schocher		the SMC.
567c92fac91SHeiko Schocher
568c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
569c609719bSwdenk		Delay before automatically booting the default image;
570c609719bSwdenk		set to -1 to disable autoboot.
571c609719bSwdenk
572c609719bSwdenk		See doc/README.autoboot for these options that
573c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
574c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
575c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
576c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
577c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
578c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
579c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
580c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
581c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
582c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
583c609719bSwdenk		CONFIG_RESET_TO_RETRY
584c609719bSwdenk
585c609719bSwdenk- Autoboot Command:
586c609719bSwdenk		CONFIG_BOOTCOMMAND
587c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
588c609719bSwdenk		define a command string that is automatically executed
589c609719bSwdenk		when no character is read on the console interface
590c609719bSwdenk		within "Boot Delay" after reset.
591c609719bSwdenk
592c609719bSwdenk		CONFIG_BOOTARGS
593c609719bSwdenk		This can be used to pass arguments to the bootm
594c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
595c609719bSwdenk		environment value "bootargs".
596c609719bSwdenk
597c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
598c609719bSwdenk		The value of these goes into the environment as
599c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
600c609719bSwdenk		as a convenience, when switching between booting from
60111ccc33fSMarcel Ziswiler		RAM and NFS.
602c609719bSwdenk
603c609719bSwdenk- Pre-Boot Commands:
604c609719bSwdenk		CONFIG_PREBOOT
605c609719bSwdenk
606c609719bSwdenk		When this option is #defined, the existence of the
607c609719bSwdenk		environment variable "preboot" will be checked
608c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
609c609719bSwdenk		countdown and/or running the auto-boot command resp.
610c609719bSwdenk		entering interactive mode.
611c609719bSwdenk
612c609719bSwdenk		This feature is especially useful when "preboot" is
613c609719bSwdenk		automatically generated or modified. For an example
614c609719bSwdenk		see the LWMON board specific code: here "preboot" is
615c609719bSwdenk		modified when the user holds down a certain
616c609719bSwdenk		combination of keys on the (special) keyboard when
617c609719bSwdenk		booting the systems
618c609719bSwdenk
619c609719bSwdenk- Serial Download Echo Mode:
620c609719bSwdenk		CONFIG_LOADS_ECHO
621c609719bSwdenk		If defined to 1, all characters received during a
622c609719bSwdenk		serial download (using the "loads" command) are
623c609719bSwdenk		echoed back. This might be needed by some terminal
624c609719bSwdenk		emulations (like "cu"), but may as well just take
625c609719bSwdenk		time on others. This setting #define's the initial
626c609719bSwdenk		value of the "loads_echo" environment variable.
627c609719bSwdenk
628602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
629c609719bSwdenk		CONFIG_KGDB_BAUDRATE
630c609719bSwdenk		Select one of the baudrates listed in
6316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
632c609719bSwdenk
633c609719bSwdenk- Monitor Functions:
634602ad3b3SJon Loeliger		Monitor commands can be included or excluded
635602ad3b3SJon Loeliger		from the build by using the #include files
636602ad3b3SJon Loeliger		"config_cmd_all.h" and #undef'ing unwanted
637602ad3b3SJon Loeliger		commands, or using "config_cmd_default.h"
638602ad3b3SJon Loeliger		and augmenting with additional #define's
639602ad3b3SJon Loeliger		for wanted commands.
640c609719bSwdenk
641602ad3b3SJon Loeliger		The default command configuration includes all commands
642602ad3b3SJon Loeliger		except those marked below with a "*".
643602ad3b3SJon Loeliger
644602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
645602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
646602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
647602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
648602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
649602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
650602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
651602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
652710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
653602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
654602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
655602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
656a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
657a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
658a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
659a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
660602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
661602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
662246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
663602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
664602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
6650c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
666bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
667602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
668602ad3b3SJon Loeliger		CONFIG_CMD_FAT		* FAT partition support
669602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
670602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
671602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
672a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
673a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
674602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
675602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
676602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
677602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
678602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
679602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
6800c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
681602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
682602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
683602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
684602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
6851ba7fd25SMike Frysinger		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
686602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
687602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
68802c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
68902c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
690602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
69156523f12Swdenk					  loop, loopw, mtest
692602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
693602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
694602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
69568d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
696602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
697602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
698e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
699e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO	* PCA953x I2C gpio info command
700602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
701602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
702602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
703602ad3b3SJon Loeliger					  host
704602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
705602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
706602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
707602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
708602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
709602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
710602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
711602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
712602ad3b3SJon Loeliger					  (4xx only)
713c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
71402c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
71574de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
716602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
7177a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
718602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
719602ad3b3SJon Loeliger		CONFIG_CMD_VFD		* VFD support (TRAB)
720602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
721602ad3b3SJon Loeliger		CONFIG_CMD_FSL		* Microblaze FSL support
722c609719bSwdenk
723c609719bSwdenk
724c609719bSwdenk		EXAMPLE: If you want all functions except of network
725c609719bSwdenk		support you can write:
726c609719bSwdenk
727602ad3b3SJon Loeliger		#include "config_cmd_all.h"
728602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
729c609719bSwdenk
730213bf8c8SGerald Van Baren	Other Commands:
731213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
732c609719bSwdenk
733c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
734602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
735c609719bSwdenk		what you (and your U-Boot users) are doing. Data
736c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
737c609719bSwdenk		8260 (where accesses to the IMMR region must be
738c609719bSwdenk		uncached), and it cannot be disabled on all other
739c609719bSwdenk		systems where we (mis-) use the data cache to hold an
740c609719bSwdenk		initial stack and some data.
741c609719bSwdenk
742c609719bSwdenk
743c609719bSwdenk		XXX - this list needs to get updated!
744c609719bSwdenk
745c609719bSwdenk- Watchdog:
746c609719bSwdenk		CONFIG_WATCHDOG
747c609719bSwdenk		If this variable is defined, it enables watchdog
7486abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
7496abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
7506abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
7516abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
7526abe6fb6SDetlev Zundel		available, then no further board specific code should
7536abe6fb6SDetlev Zundel		be needed to use it.
7546abe6fb6SDetlev Zundel
7556abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
7566abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
7576abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
7586abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
759c609719bSwdenk
760c1551ea8Sstroese- U-Boot Version:
761c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
762c1551ea8Sstroese		If this variable is defined, an environment variable
763c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
764c1551ea8Sstroese		version as printed by the "version" command.
765c1551ea8Sstroese		This variable is readonly.
766c1551ea8Sstroese
767c609719bSwdenk- Real-Time Clock:
768c609719bSwdenk
769602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
770c609719bSwdenk		has to be selected, too. Define exactly one of the
771c609719bSwdenk		following options:
772c609719bSwdenk
773c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
774c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
7757ce63709SGuennadi Liakhovetski		CONFIG_RTC_MC13783	- use MC13783 RTC
776c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
7771cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
778c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
7797f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
7803bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
7819536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
7824c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
7836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
78471d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
78571d19f30SHeiko Schocher					  RV3029 RTC.
786c609719bSwdenk
787b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
788b37c7e5eSwdenk		must also be configured. See I2C Support, below.
789b37c7e5eSwdenk
790e92739d3SPeter Tyser- GPIO Support:
791e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
792e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
793e92739d3SPeter Tyser
7945dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
7955dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
7965dec49caSChris Packham		pins supported by a particular chip.
7975dec49caSChris Packham
798e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
799e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
800e92739d3SPeter Tyser
801c609719bSwdenk- Timestamp Support:
802c609719bSwdenk
803c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
804c609719bSwdenk		(date and time) of an image is printed by image
805c609719bSwdenk		commands like bootm or iminfo. This option is
806602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
807c609719bSwdenk
808c609719bSwdenk- Partition Support:
809c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
81007f3d789Srichardretanubun		and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
811c609719bSwdenk
812602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
813218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
814218ca724SWolfgang Denk		least one partition type as well.
815c609719bSwdenk
816c609719bSwdenk- IDE Reset method:
8174d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
8184d13cbadSwdenk		board configurations files but used nowhere!
819c609719bSwdenk
8204d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
8214d13cbadSwdenk		be performed by calling the function
8224d13cbadSwdenk			ide_set_reset(int reset)
8234d13cbadSwdenk		which has to be defined in a board specific file
824c609719bSwdenk
825c609719bSwdenk- ATAPI Support:
826c609719bSwdenk		CONFIG_ATAPI
827c609719bSwdenk
828c609719bSwdenk		Set this to enable ATAPI support.
829c609719bSwdenk
830c40b2956Swdenk- LBA48 Support
831c40b2956Swdenk		CONFIG_LBA48
832c40b2956Swdenk
833c40b2956Swdenk		Set this to enable support for disks larger than 137GB
8344b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
835c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
836c40b2956Swdenk		support disks up to 2.1TB.
837c40b2956Swdenk
8386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
839c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
840c40b2956Swdenk			Default is 32bit.
841c40b2956Swdenk
842c609719bSwdenk- SCSI Support:
843c609719bSwdenk		At the moment only there is only support for the
844c609719bSwdenk		SYM53C8XX SCSI controller; define
845c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
846c609719bSwdenk
8476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
8486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
8496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
850c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
851c609719bSwdenk		devices.
8526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
853c609719bSwdenk
854c609719bSwdenk- NETWORK Support (PCI):
855682011ffSwdenk		CONFIG_E1000
856682011ffSwdenk		Support for Intel 8254x gigabit chips.
857682011ffSwdenk
858ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
85911ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
860ac3315c2SAndre Schwarz
861c609719bSwdenk		CONFIG_EEPRO100
862c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
86311ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
864c609719bSwdenk		write routine for first time initialisation.
865c609719bSwdenk
866c609719bSwdenk		CONFIG_TULIP
867c609719bSwdenk		Support for Digital 2114x chips.
868c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
869c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
870c609719bSwdenk
871c609719bSwdenk		CONFIG_NATSEMI
872c609719bSwdenk		Support for National dp83815 chips.
873c609719bSwdenk
874c609719bSwdenk		CONFIG_NS8382X
875c609719bSwdenk		Support for National dp8382[01] gigabit chips.
876c609719bSwdenk
87745219c46Swdenk- NETWORK Support (other):
87845219c46Swdenk
879c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
880c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
881c041e9d2SJens Scharsig
882c041e9d2SJens Scharsig			CONFIG_RMII
883c041e9d2SJens Scharsig			Define this to use reduced MII inteface
884c041e9d2SJens Scharsig
885c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
886c041e9d2SJens Scharsig			If this defined, the driver is quiet.
887c041e9d2SJens Scharsig			The driver doen't show link status messages.
888c041e9d2SJens Scharsig
88945219c46Swdenk		CONFIG_DRIVER_LAN91C96
89045219c46Swdenk		Support for SMSC's LAN91C96 chips.
89145219c46Swdenk
89245219c46Swdenk			CONFIG_LAN91C96_BASE
89345219c46Swdenk			Define this to hold the physical address
89445219c46Swdenk			of the LAN91C96's I/O space
89545219c46Swdenk
89645219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
89745219c46Swdenk			Define this to enable 32 bit addressing
89845219c46Swdenk
899f39748aeSwdenk		CONFIG_DRIVER_SMC91111
900f39748aeSwdenk		Support for SMSC's LAN91C111 chip
901f39748aeSwdenk
902f39748aeSwdenk			CONFIG_SMC91111_BASE
903f39748aeSwdenk			Define this to hold the physical address
904f39748aeSwdenk			of the device (I/O space)
905f39748aeSwdenk
906f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
907f39748aeSwdenk			Define this if data bus is 32 bits
908f39748aeSwdenk
909f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
910f39748aeSwdenk			Define this to use i/o functions instead of macros
911f39748aeSwdenk			(some hardware wont work with macros)
912f39748aeSwdenk
913b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
914b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
915b3dbf4a5SMacpaul Lin
916b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
917b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
918b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
919b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
920b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
921b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
922b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
923b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
924b3dbf4a5SMacpaul Lin
925c2fff331SMike Rapoport		CONFIG_SMC911X
926557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
927557b377dSJens Gehrlein
928c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
929557b377dSJens Gehrlein			Define this to hold the physical address
930557b377dSJens Gehrlein			of the device (I/O space)
931557b377dSJens Gehrlein
932c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
933557b377dSJens Gehrlein			Define this if data bus is 32 bits
934557b377dSJens Gehrlein
935c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
936557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
937557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
938c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
939557b377dSJens Gehrlein
9403d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
9413d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
9423d0075faSYoshihiro Shimoda
9433d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
9443d0075faSYoshihiro Shimoda			Define the number of ports to be used
9453d0075faSYoshihiro Shimoda
9463d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
9473d0075faSYoshihiro Shimoda			Define the ETH PHY's address
9483d0075faSYoshihiro Shimoda
94968260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
95068260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
95168260aabSYoshihiro Shimoda
952c609719bSwdenk- USB Support:
953c609719bSwdenk		At the moment only the UHCI host controller is
9544d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
955c609719bSwdenk		CONFIG_USB_UHCI to enable it.
956c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
95730d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
958c609719bSwdenk		storage devices.
959c609719bSwdenk		Note:
960c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
961c609719bSwdenk		(TEAC FD-05PUB).
9624d13cbadSwdenk		MPC5200 USB requires additional defines:
9634d13cbadSwdenk			CONFIG_USB_CLOCK
9644d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
965307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
966307ecb6dSEric Millbrandt				for USB on PSC3
9674d13cbadSwdenk			CONFIG_USB_CONFIG
9684d13cbadSwdenk				for differential drivers: 0x00001000
9694d13cbadSwdenk				for single ended drivers: 0x00005000
970307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
971307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
9726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
973fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
974fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
9754d13cbadSwdenk
97616c8d5e7SWolfgang Denk- USB Device:
97716c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
97816c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
97916c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
98011ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
98116c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
98216c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
98316c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
98416c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
98516c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
98616c8d5e7SWolfgang Denk		a Linux host by
98716c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
98816c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
98916c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
99016c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
99116c8d5e7SWolfgang Denk
99216c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
99316c8d5e7SWolfgang Denk			Define this to build a UDC device
99416c8d5e7SWolfgang Denk
99516c8d5e7SWolfgang Denk			CONFIG_USB_TTY
99616c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
99716c8d5e7SWolfgang Denk			talk to the UDC device
99816c8d5e7SWolfgang Denk
9996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
100016c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
100116c8d5e7SWolfgang Denk			be set to usbtty.
100216c8d5e7SWolfgang Denk
100316c8d5e7SWolfgang Denk			mpc8xx:
10046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
100516c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
10066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
100716c8d5e7SWolfgang Denk
10086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
100916c8d5e7SWolfgang Denk				Derive USB clock from brgclk
10106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
101116c8d5e7SWolfgang Denk
101216c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
101316c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
101416c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
101516c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
101616c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
101716c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
101816c8d5e7SWolfgang Denk
101916c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
102016c8d5e7SWolfgang Denk			Define this string as the name of your company for
102116c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
102216c8d5e7SWolfgang Denk
102316c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
102416c8d5e7SWolfgang Denk			Define this string as the name of your product
102516c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
102616c8d5e7SWolfgang Denk
102716c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
102816c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
102916c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
103016c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
103116c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
103216c8d5e7SWolfgang Denk
103316c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
103416c8d5e7SWolfgang Denk			Define this as the unique Product ID
103516c8d5e7SWolfgang Denk			for your device
103616c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1037c609719bSwdenk
1038c609719bSwdenk
1039c609719bSwdenk- MMC Support:
1040c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1041c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1042c609719bSwdenk		accessed from the boot prompt by mapping the device
1043c609719bSwdenk		to physical memory similar to flash. Command line is
1044602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1045602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1046c609719bSwdenk
10476705d81eSwdenk- Journaling Flash filesystem support:
10486705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
10496705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
10506705d81eSwdenk		Define these for a default partition on a NAND device
10516705d81eSwdenk
10526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
10536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
10546705d81eSwdenk		Define these for a default partition on a NOR device
10556705d81eSwdenk
10566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
10576705d81eSwdenk		Define this to create an own partition. You have to provide a
10586705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
10596705d81eSwdenk
10606705d81eSwdenk		If you define only one JFFS2 partition you may also want to
10616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
10626705d81eSwdenk		to disable the command chpart. This is the default when you
10636705d81eSwdenk		have not defined a custom partition
10646705d81eSwdenk
1065c609719bSwdenk- Keyboard Support:
1066c609719bSwdenk		CONFIG_ISA_KEYBOARD
1067c609719bSwdenk
1068c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1069c609719bSwdenk		support
1070c609719bSwdenk
1071c609719bSwdenk		CONFIG_I8042_KBD
1072c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1073c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1074c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1075c609719bSwdenk		for cfb_console. Supports cursor blinking.
1076c609719bSwdenk
1077c609719bSwdenk- Video support:
1078c609719bSwdenk		CONFIG_VIDEO
1079c609719bSwdenk
1080c609719bSwdenk		Define this to enable video support (for output to
1081c609719bSwdenk		video).
1082c609719bSwdenk
1083c609719bSwdenk		CONFIG_VIDEO_CT69000
1084c609719bSwdenk
1085c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1086c609719bSwdenk
1087c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1088eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1089eeb1b77bSwdenk		video output is selected via environment 'videoout'
1090eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1091eeb1b77bSwdenk		assumed.
1092c609719bSwdenk
1093eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
109411ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1095eeb1b77bSwdenk		are possible:
1096eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1097eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1098eeb1b77bSwdenk
1099eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1100eeb1b77bSwdenk		-------------+---------------------------------------------
1101eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1102eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1103eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1104eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1105eeb1b77bSwdenk		-------------+---------------------------------------------
1106c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1107c609719bSwdenk
1108eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
11097817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1110eeb1b77bSwdenk
1111eeb1b77bSwdenk
1112a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1113a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1114a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1115a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1116a6c7ad2fSwdenk
11177d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
11187d3053fbSTimur Tabi		Enable the Freescale DIU video driver.  Reference boards for
11197d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
11207d3053fbSTimur Tabi		support, and should also define these other macros:
11217d3053fbSTimur Tabi
11227d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
11237d3053fbSTimur Tabi			CONFIG_VIDEO
11247d3053fbSTimur Tabi			CONFIG_CMD_BMP
11257d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
11267d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
11277d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
11287d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
11297d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
11307d3053fbSTimur Tabi
1131ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1132ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1133ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1134ba8e76bdSTimur Tabi		description of this variable.
11357d3053fbSTimur Tabi
1136682011ffSwdenk- Keyboard Support:
1137682011ffSwdenk		CONFIG_KEYBOARD
1138682011ffSwdenk
1139682011ffSwdenk		Define this to enable a custom keyboard support.
1140682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1141682011ffSwdenk		defined in your board-specific files.
1142682011ffSwdenk		The only board using this so far is RBC823.
1143a6c7ad2fSwdenk
1144c609719bSwdenk- LCD Support:	CONFIG_LCD
1145c609719bSwdenk
1146c609719bSwdenk		Define this to enable LCD support (for output to LCD
1147c609719bSwdenk		display); also select one of the supported displays
1148c609719bSwdenk		by defining one of these:
1149c609719bSwdenk
115039cf4804SStelian Pop		CONFIG_ATMEL_LCD:
115139cf4804SStelian Pop
115239cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
115339cf4804SStelian Pop
1154fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1155c609719bSwdenk
1156fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1157c609719bSwdenk
1158fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1159c609719bSwdenk
1160fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1161fd3103bbSwdenk			Active, color, single scan.
1162fd3103bbSwdenk
1163fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1164fd3103bbSwdenk
1165fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1166c609719bSwdenk			Active, color, single scan.
1167c609719bSwdenk
1168c609719bSwdenk		CONFIG_SHARP_16x9
1169c609719bSwdenk
1170c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1171c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1172c609719bSwdenk
1173c609719bSwdenk		CONFIG_SHARP_LQ64D341
1174c609719bSwdenk
1175c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1176c609719bSwdenk			Active, color, single scan.
1177c609719bSwdenk
1178c609719bSwdenk		CONFIG_HLD1045
1179c609719bSwdenk
1180c609719bSwdenk			HLD1045 display, 640x480.
1181c609719bSwdenk			Active, color, single scan.
1182c609719bSwdenk
1183c609719bSwdenk		CONFIG_OPTREX_BW
1184c609719bSwdenk
1185c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1186c609719bSwdenk			or
1187c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1188c609719bSwdenk			or
1189c609719bSwdenk			Hitachi	 SP14Q002
1190c609719bSwdenk
1191c609719bSwdenk			320x240. Black & white.
1192c609719bSwdenk
1193c609719bSwdenk		Normally display is black on white background; define
11946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1195c609719bSwdenk
11967152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1197d791b1dcSwdenk
1198d791b1dcSwdenk		If this option is set, the environment is checked for
1199d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1200d791b1dcSwdenk		of logo, copyright and system information on the LCD
1201e94d2cd9Swdenk		is suppressed and the BMP image at the address
1202d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1203d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1204d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1205d791b1dcSwdenk		loaded very quickly after power-on.
1206d791b1dcSwdenk
12071ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
12081ca298ceSMatthias Weisser
12091ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
12101ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
12111ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
12121ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
12131ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
12141ca298ceSMatthias Weisser		specify 'm' for centering the image.
12151ca298ceSMatthias Weisser
12161ca298ceSMatthias Weisser		Example:
12171ca298ceSMatthias Weisser		setenv splashpos m,m
12181ca298ceSMatthias Weisser			=> image at center of screen
12191ca298ceSMatthias Weisser
12201ca298ceSMatthias Weisser		setenv splashpos 30,20
12211ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
12221ca298ceSMatthias Weisser
12231ca298ceSMatthias Weisser		setenv splashpos -10,m
12241ca298ceSMatthias Weisser			=> vertically centered image
12251ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
12261ca298ceSMatthias Weisser
122798f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
122898f4a3dfSStefan Roese
122998f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
123098f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
123198f4a3dfSStefan Roese		splashscreen support or the bmp command.
123298f4a3dfSStefan Roese
1233d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1234d5011762SAnatolij Gustschin
1235d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1236d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1237d5011762SAnatolij Gustschin		bmp command.
1238d5011762SAnatolij Gustschin
1239c29fdfc1Swdenk- Compression support:
1240c29fdfc1Swdenk		CONFIG_BZIP2
1241c29fdfc1Swdenk
1242c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1243c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1244c29fdfc1Swdenk		compressed images are supported.
1245c29fdfc1Swdenk
1246c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
12476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1248c29fdfc1Swdenk		be at least 4MB.
1249d791b1dcSwdenk
1250fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1251fc9c1727SLuigi 'Comio' Mantellini
1252fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1253fc9c1727SLuigi 'Comio' Mantellini		images is included.
1254fc9c1727SLuigi 'Comio' Mantellini
1255fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1256fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1257fc9c1727SLuigi 'Comio' Mantellini		formula:
1258fc9c1727SLuigi 'Comio' Mantellini
1259fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1260fc9c1727SLuigi 'Comio' Mantellini
1261fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1262fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1263fc9c1727SLuigi 'Comio' Mantellini
1264fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1265fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1266fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1267fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1268fc9c1727SLuigi 'Comio' Mantellini
1269fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1270fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
12716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1272fc9c1727SLuigi 'Comio' Mantellini
127317ea1177Swdenk- MII/PHY support:
127417ea1177Swdenk		CONFIG_PHY_ADDR
127517ea1177Swdenk
127617ea1177Swdenk		The address of PHY on MII bus.
127717ea1177Swdenk
127817ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
127917ea1177Swdenk
128017ea1177Swdenk		The clock frequency of the MII bus
128117ea1177Swdenk
128217ea1177Swdenk		CONFIG_PHY_GIGE
128317ea1177Swdenk
128417ea1177Swdenk		If this option is set, support for speed/duplex
128511ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
128617ea1177Swdenk
128717ea1177Swdenk		CONFIG_PHY_RESET_DELAY
128817ea1177Swdenk
128917ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
129017ea1177Swdenk		reset before any MII register access is possible.
129117ea1177Swdenk		For such PHY, set this option to the usec delay
129217ea1177Swdenk		required. (minimum 300usec for LXT971A)
129317ea1177Swdenk
129417ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
129517ea1177Swdenk
129617ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
129717ea1177Swdenk		command issued before MII status register can be read
129817ea1177Swdenk
1299c609719bSwdenk- Ethernet address:
1300c609719bSwdenk		CONFIG_ETHADDR
1301c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1302c609719bSwdenk		CONFIG_ETH2ADDR
1303c609719bSwdenk		CONFIG_ETH3ADDR
1304c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1305c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1306c609719bSwdenk
130711ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
130811ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1309c609719bSwdenk		is not determined automatically.
1310c609719bSwdenk
1311c609719bSwdenk- IP address:
1312c609719bSwdenk		CONFIG_IPADDR
1313c609719bSwdenk
1314c609719bSwdenk		Define a default value for the IP address to use for
131511ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1316c609719bSwdenk		determined through e.g. bootp.
1317c609719bSwdenk
1318c609719bSwdenk- Server IP address:
1319c609719bSwdenk		CONFIG_SERVERIP
1320c609719bSwdenk
1321c609719bSwdenk		Defines a default value for the IP address of a TFTP
1322c609719bSwdenk		server to contact when using the "tftboot" command.
1323c609719bSwdenk
132497cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
132597cfe861SRobin Getz
132697cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
132797cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
132897cfe861SRobin Getz
132953a5c424SDavid Updegraff- Multicast TFTP Mode:
133053a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
133153a5c424SDavid Updegraff
133253a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
133353a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
133411ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
133553a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
133653a5c424SDavid Updegraff		multicast group.
133753a5c424SDavid Updegraff
1338c609719bSwdenk- BOOTP Recovery Mode:
1339c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1340c609719bSwdenk
1341c609719bSwdenk		If you have many targets in a network that try to
1342c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1343c609719bSwdenk		systems send out BOOTP requests at precisely the same
1344c609719bSwdenk		moment (which would happen for instance at recovery
1345c609719bSwdenk		from a power failure, when all systems will try to
1346c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1347c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1348c609719bSwdenk		inserted before sending out BOOTP requests. The
13496c33c785SWolfgang Denk		following delays are inserted then:
1350c609719bSwdenk
1351c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1352c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1353c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1354c609719bSwdenk		4th and following
1355c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1356c609719bSwdenk
1357fe389a82Sstroese- DHCP Advanced Options:
13581fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
13591fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1360fe389a82Sstroese
13611fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
13621fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
13631fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
13641fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
13651fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
13661fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
13671fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
13681fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
13691fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
13701fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
13711fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
13721fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
1373fe389a82Sstroese
13745d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
13755d110f0aSWilson Callan		environment variable, not the BOOTP server.
1376fe389a82Sstroese
1377fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1378fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1379fe389a82Sstroese		than one DNS serverip is offered to the client.
1380fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1381fe389a82Sstroese		serverip will be stored in the additional environment
1382fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1383fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
13841fe80d79SJon Loeliger		is defined.
1385fe389a82Sstroese
1386fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1387fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1388fe389a82Sstroese		need the hostname of the DHCP requester.
13895d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
13901fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
13911fe80d79SJon Loeliger		option 12 to the DHCP server.
1392fe389a82Sstroese
1393d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1394d9a2f416SAras Vaichas
1395d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1396d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1397d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1398d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1399d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1400d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1401d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1402d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1403d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1404d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1405d9a2f416SAras Vaichas		this delay.
1406d9a2f416SAras Vaichas
1407a3d991bdSwdenk - CDP Options:
1408a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1409a3d991bdSwdenk
1410a3d991bdSwdenk		The device id used in CDP trigger frames.
1411a3d991bdSwdenk
1412a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1413a3d991bdSwdenk
1414a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1415a3d991bdSwdenk		of the device.
1416a3d991bdSwdenk
1417a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1418a3d991bdSwdenk
1419a3d991bdSwdenk		A printf format string which contains the ascii name of
1420a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
142111ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1422a3d991bdSwdenk
1423a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1424a3d991bdSwdenk
1425a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1426a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1427a3d991bdSwdenk
1428a3d991bdSwdenk		CONFIG_CDP_VERSION
1429a3d991bdSwdenk
1430a3d991bdSwdenk		An ascii string containing the version of the software.
1431a3d991bdSwdenk
1432a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1433a3d991bdSwdenk
1434a3d991bdSwdenk		An ascii string containing the name of the platform.
1435a3d991bdSwdenk
1436a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1437a3d991bdSwdenk
1438a3d991bdSwdenk		A 32bit integer sent on the trigger.
1439a3d991bdSwdenk
1440a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1441a3d991bdSwdenk
1442a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1443a3d991bdSwdenk		device in .1 of milliwatts.
1444a3d991bdSwdenk
1445a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1446a3d991bdSwdenk
1447a3d991bdSwdenk		A byte containing the id of the VLAN.
1448a3d991bdSwdenk
1449c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1450c609719bSwdenk
1451c609719bSwdenk		Several configurations allow to display the current
1452c609719bSwdenk		status using a LED. For instance, the LED will blink
1453c609719bSwdenk		fast while running U-Boot code, stop blinking as
1454c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1455c609719bSwdenk		start blinking slow once the Linux kernel is running
1456c609719bSwdenk		(supported by a status LED driver in the Linux
1457c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1458c609719bSwdenk		feature in U-Boot.
1459c609719bSwdenk
1460c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1461c609719bSwdenk
1462c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1463c609719bSwdenk		on those systems that support this (optional)
1464c609719bSwdenk		feature, like the TQM8xxL modules.
1465c609719bSwdenk
1466c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1467c609719bSwdenk
1468b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1469b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
147011ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1471c609719bSwdenk
1472b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1473602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1474b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1475b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1476c609719bSwdenk		command line interface.
1477c609719bSwdenk
1478bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1479c609719bSwdenk
1480b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1481b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1482b37c7e5eSwdenk		support for I2C.
1483c609719bSwdenk
1484b37c7e5eSwdenk		There are several other quantities that must also be
1485b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1486c609719bSwdenk
14876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1488b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
14896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
149011ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1491c609719bSwdenk
14928d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
1493a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
14948d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
14958d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
14968d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
1497b37c7e5eSwdenk
14985da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
14995da71efaSEric Millbrandt
15005da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
15015da71efaSEric Millbrandt		chips might think that the current transfer is still
15025da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
15035da71efaSEric Millbrandt		commands until the slave device responds.
15045da71efaSEric Millbrandt
1505b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1506b37c7e5eSwdenk
1507b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1508b37c7e5eSwdenk		then the following macros need to be defined (examples are
1509b37c7e5eSwdenk		from include/configs/lwmon.h):
1510c609719bSwdenk
1511c609719bSwdenk		I2C_INIT
1512c609719bSwdenk
1513b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1514c609719bSwdenk		controller or configure ports.
1515c609719bSwdenk
1516b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1517b37c7e5eSwdenk
1518c609719bSwdenk		I2C_PORT
1519c609719bSwdenk
1520c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1521c609719bSwdenk		assumes both bits are on the same port). Valid values
1522c609719bSwdenk		are 0..3 for ports A..D.
1523c609719bSwdenk
1524c609719bSwdenk		I2C_ACTIVE
1525c609719bSwdenk
1526c609719bSwdenk		The code necessary to make the I2C data line active
1527c609719bSwdenk		(driven).  If the data line is open collector, this
1528c609719bSwdenk		define can be null.
1529c609719bSwdenk
1530b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1531b37c7e5eSwdenk
1532c609719bSwdenk		I2C_TRISTATE
1533c609719bSwdenk
1534c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1535c609719bSwdenk		(inactive).  If the data line is open collector, this
1536c609719bSwdenk		define can be null.
1537c609719bSwdenk
1538b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1539b37c7e5eSwdenk
1540c609719bSwdenk		I2C_READ
1541c609719bSwdenk
1542c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1543c609719bSwdenk		FALSE if it is low.
1544c609719bSwdenk
1545b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1546b37c7e5eSwdenk
1547c609719bSwdenk		I2C_SDA(bit)
1548c609719bSwdenk
1549c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1550c609719bSwdenk		is FALSE, it clears it (low).
1551c609719bSwdenk
1552b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1553b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1554b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1555b37c7e5eSwdenk
1556c609719bSwdenk		I2C_SCL(bit)
1557c609719bSwdenk
1558c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1559c609719bSwdenk		is FALSE, it clears it (low).
1560c609719bSwdenk
1561b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1562b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1563b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1564b37c7e5eSwdenk
1565c609719bSwdenk		I2C_DELAY
1566c609719bSwdenk
1567c609719bSwdenk		This delay is invoked four times per clock cycle so this
1568c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1569b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1570b37c7e5eSwdenk		like:
1571b37c7e5eSwdenk
1572b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1573c609719bSwdenk
1574793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1575793b5726SMike Frysinger
1576793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
1577793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
1578793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
1579793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
1580793b5726SMike Frysinger
1581793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
1582793b5726SMike Frysinger		the generic GPIO functions.
1583793b5726SMike Frysinger
15846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
158547cd00faSwdenk
158647cd00faSwdenk		When a board is reset during an i2c bus transfer
158747cd00faSwdenk		chips might think that the current transfer is still
158847cd00faSwdenk		in progress. On some boards it is possible to access
158947cd00faSwdenk		the i2c SCLK line directly, either by using the
159047cd00faSwdenk		processor pin as a GPIO or by having a second pin
159147cd00faSwdenk		connected to the bus. If this option is defined a
159247cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
159347cd00faSwdenk		is run early in the boot sequence.
159447cd00faSwdenk
159526a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
159626a33504SRichard Retanubun
159726a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
159826a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
159926a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
160026a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
160126a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
160226a33504SRichard Retanubun		controller provide such a method. It is called at the end of
160326a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
160426a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
160526a33504SRichard Retanubun
160617ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
160717ea1177Swdenk
160817ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
160917ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
161017ea1177Swdenk		variable "i2cfast". (see also i2cfast)
161117ea1177Swdenk
1612bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
1613bb99ad6dSBen Warren
1614bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
1615bb99ad6dSBen Warren		must have a controller.  At any point in time, only one bus is
1616bb99ad6dSBen Warren		active.  To switch to a different bus, use the 'i2c dev' command.
1617bb99ad6dSBen Warren		Note that bus numbering is zero-based.
1618bb99ad6dSBen Warren
16196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
1620bb99ad6dSBen Warren
1621bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
16220f89c54bSPeter Tyser		when the 'i2c probe' command is issued.  If CONFIG_I2C_MULTI_BUS
16230f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
16240f89c54bSPeter Tyser		a 1D array of device addresses
1625bb99ad6dSBen Warren
1626bb99ad6dSBen Warren		e.g.
1627bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
16286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES	{0x50,0x68}
1629bb99ad6dSBen Warren
1630bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
1631bb99ad6dSBen Warren
1632bb99ad6dSBen Warren			#define	CONFIG_I2C_MULTI_BUS
16336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
1634bb99ad6dSBen Warren
1635bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1636bb99ad6dSBen Warren
16376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
1638be5e6181STimur Tabi
1639be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
1640be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1641be5e6181STimur Tabi
16426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
16430dc018ecSStefan Roese
16440dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
16450dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
16460dc018ecSStefan Roese
16476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
16480dc018ecSStefan Roese
16490dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
16500dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
16510dc018ecSStefan Roese
16526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
16539ebbb54fSVictor Gallardo
16549ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
16559ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
16569ebbb54fSVictor Gallardo		specified DTT device.
16579ebbb54fSVictor Gallardo
1658be5e6181STimur Tabi		CONFIG_FSL_I2C
1659be5e6181STimur Tabi
1660be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
16617817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
1662be5e6181STimur Tabi
166367b23a32SHeiko Schocher		CONFIG_I2C_MUX
166467b23a32SHeiko Schocher
166567b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
166667b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
166767b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
166867b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
166967b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
167067b23a32SHeiko Schocher		the muxes to activate this new "bus".
167167b23a32SHeiko Schocher
167267b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
167367b23a32SHeiko Schocher		feature!
167467b23a32SHeiko Schocher
167567b23a32SHeiko Schocher		Example:
167667b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
167767b23a32SHeiko Schocher			The First mux with address 70 and channel 6
167867b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
167967b23a32SHeiko Schocher
168067b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
168167b23a32SHeiko Schocher
168267b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
168367b23a32SHeiko Schocher		of I2C Busses with muxes:
168467b23a32SHeiko Schocher
168567b23a32SHeiko Schocher		=> i2c bus
168667b23a32SHeiko Schocher		Busses reached over muxes:
168767b23a32SHeiko Schocher		Bus ID: 2
168867b23a32SHeiko Schocher		  reached over Mux(es):
168967b23a32SHeiko Schocher		    pca9544a@70 ch: 4
169067b23a32SHeiko Schocher		Bus ID: 3
169167b23a32SHeiko Schocher		  reached over Mux(es):
169267b23a32SHeiko Schocher		    pca9544a@70 ch: 6
169367b23a32SHeiko Schocher		    pca9544a@71 ch: 4
169467b23a32SHeiko Schocher		=>
169567b23a32SHeiko Schocher
169667b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
169767b23a32SHeiko Schocher		u-boot sends First the Commando to the mux@70 to enable
169867b23a32SHeiko Schocher		channel 6, and then the Commando to the mux@71 to enable
169967b23a32SHeiko Schocher		the channel 4.
170067b23a32SHeiko Schocher
170167b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
170267b23a32SHeiko Schocher		usual, to communicate with your I2C devices behind
170367b23a32SHeiko Schocher		the 2 muxes.
170467b23a32SHeiko Schocher
170567b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
170667b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
170767b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
170867b23a32SHeiko Schocher		to add this option to other architectures.
170967b23a32SHeiko Schocher
17102ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
17112ac6985aSAndrew Dyer
17122ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
17132ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
17142ac6985aSAndrew Dyer		between writing the address pointer and reading the
17152ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
17162ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
17172ac6985aSAndrew Dyer		devices can use either method, but some require one or
17182ac6985aSAndrew Dyer		the other.
1719be5e6181STimur Tabi
1720c609719bSwdenk- SPI Support:	CONFIG_SPI
1721c609719bSwdenk
1722c609719bSwdenk		Enables SPI driver (so far only tested with
1723c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
1724c609719bSwdenk		D/As on the SACSng board)
1725c609719bSwdenk
17266639562eSYoshihiro Shimoda		CONFIG_SH_SPI
17276639562eSYoshihiro Shimoda
17286639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
17296639562eSYoshihiro Shimoda		only SH7757 is supported.
17306639562eSYoshihiro Shimoda
1731c609719bSwdenk		CONFIG_SPI_X
1732c609719bSwdenk
1733c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
1734c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
1735c609719bSwdenk
1736c609719bSwdenk		CONFIG_SOFT_SPI
1737c609719bSwdenk
1738c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
1739c609719bSwdenk		using hardware support. This is a general purpose
1740c609719bSwdenk		driver that only requires three general I/O port pins
1741c609719bSwdenk		(two outputs, one input) to function. If this is
1742c609719bSwdenk		defined, the board configuration must define several
1743c609719bSwdenk		SPI configuration items (port pins to use, etc). For
1744c609719bSwdenk		an example, see include/configs/sacsng.h.
1745c609719bSwdenk
174604a9e118SBen Warren		CONFIG_HARD_SPI
174704a9e118SBen Warren
174804a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
174904a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
175004a9e118SBen Warren		must define a list of chip-select function pointers.
175104a9e118SBen Warren		Currently supported on some MPC8xxx processors.  For an
175204a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
175304a9e118SBen Warren
175438254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
175538254f45SGuennadi Liakhovetski
175638254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
175738254f45SGuennadi Liakhovetski		SoCs. Currently only i.MX31 is supported.
175838254f45SGuennadi Liakhovetski
17590133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
17600133502eSMatthias Fuchs
17610133502eSMatthias Fuchs		Enables FPGA subsystem.
17620133502eSMatthias Fuchs
17630133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
17640133502eSMatthias Fuchs
17650133502eSMatthias Fuchs		Enables support for specific chip vendors.
17660133502eSMatthias Fuchs		(ALTERA, XILINX)
17670133502eSMatthias Fuchs
17680133502eSMatthias Fuchs		CONFIG_FPGA_<family>
17690133502eSMatthias Fuchs
17700133502eSMatthias Fuchs		Enables support for FPGA family.
17710133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
17720133502eSMatthias Fuchs
17730133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
1774c609719bSwdenk
1775c609719bSwdenk		Specify the number of FPGA devices to support.
1776c609719bSwdenk
17776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
1778c609719bSwdenk
1779c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
1780c609719bSwdenk
17816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
1782c609719bSwdenk
1783c609719bSwdenk		Enable checks on FPGA configuration interface busy
1784c609719bSwdenk		status by the configuration function. This option
1785c609719bSwdenk		will require a board or device specific function to
1786c609719bSwdenk		be written.
1787c609719bSwdenk
1788c609719bSwdenk		CONFIG_FPGA_DELAY
1789c609719bSwdenk
1790c609719bSwdenk		If defined, a function that provides delays in the FPGA
1791c609719bSwdenk		configuration driver.
1792c609719bSwdenk
17936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
1794c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1795c609719bSwdenk
17966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
1797c609719bSwdenk
1798c609719bSwdenk		Check for configuration errors during FPGA bitfile
1799c609719bSwdenk		loading. For example, abort during Virtex II
1800c609719bSwdenk		configuration if the INIT_B line goes low (which
1801c609719bSwdenk		indicated a CRC error).
1802c609719bSwdenk
18036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
1804c609719bSwdenk
1805c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
1806c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
1807c609719bSwdenk		FPGA configuration sequence. The default time is 500
180811ccc33fSMarcel Ziswiler		ms.
1809c609719bSwdenk
18106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
1811c609719bSwdenk
1812c609719bSwdenk		Maximum time to wait for BUSY to deassert during
181311ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
1814c609719bSwdenk
18156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
1816c609719bSwdenk
1817c609719bSwdenk		Time to wait after FPGA configuration. The default is
181811ccc33fSMarcel Ziswiler		200 ms.
1819c609719bSwdenk
1820c609719bSwdenk- Configuration Management:
1821c609719bSwdenk		CONFIG_IDENT_STRING
1822c609719bSwdenk
1823c609719bSwdenk		If defined, this string will be added to the U-Boot
1824c609719bSwdenk		version information (U_BOOT_VERSION)
1825c609719bSwdenk
1826c609719bSwdenk- Vendor Parameter Protection:
1827c609719bSwdenk
1828c609719bSwdenk		U-Boot considers the values of the environment
1829c609719bSwdenk		variables "serial#" (Board Serial Number) and
18307152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
1831c609719bSwdenk		are set once by the board vendor / manufacturer, and
1832c609719bSwdenk		protects these variables from casual modification by
1833c609719bSwdenk		the user. Once set, these variables are read-only,
1834c609719bSwdenk		and write or delete attempts are rejected. You can
183511ccc33fSMarcel Ziswiler		change this behaviour:
1836c609719bSwdenk
1837c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
1838c609719bSwdenk		file, the write protection for vendor parameters is
183947cd00faSwdenk		completely disabled. Anybody can change or delete
1840c609719bSwdenk		these parameters.
1841c609719bSwdenk
1842c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
1843c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
184411ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
1845c609719bSwdenk		which can be changed exactly ONCE by the user. [The
1846c609719bSwdenk		serial# is unaffected by this, i. e. it remains
1847c609719bSwdenk		read-only.]
1848c609719bSwdenk
1849c609719bSwdenk- Protected RAM:
1850c609719bSwdenk		CONFIG_PRAM
1851c609719bSwdenk
1852c609719bSwdenk		Define this variable to enable the reservation of
1853c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
1854c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
1855c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
1856c609719bSwdenk		this default value by defining an environment
1857c609719bSwdenk		variable "pram" to the number of kB you want to
1858c609719bSwdenk		reserve. Note that the board info structure will
1859c609719bSwdenk		still show the full amount of RAM. If pRAM is
1860c609719bSwdenk		reserved, a new environment variable "mem" will
1861c609719bSwdenk		automatically be defined to hold the amount of
1862c609719bSwdenk		remaining RAM in a form that can be passed as boot
1863c609719bSwdenk		argument to Linux, for instance like that:
1864c609719bSwdenk
1865fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
1866c609719bSwdenk			saveenv
1867c609719bSwdenk
1868c609719bSwdenk		This way you can tell Linux not to use this memory,
1869c609719bSwdenk		either, which results in a memory region that will
1870c609719bSwdenk		not be affected by reboots.
1871c609719bSwdenk
1872c609719bSwdenk		*WARNING* If your board configuration uses automatic
1873c609719bSwdenk		detection of the RAM size, you must make sure that
1874c609719bSwdenk		this memory test is non-destructive. So far, the
1875c609719bSwdenk		following board configurations are known to be
1876c609719bSwdenk		"pRAM-clean":
1877c609719bSwdenk
1878c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
1879c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
1880544d97e9SWolfgang Denk			FLAGADM, TQM8260
1881c609719bSwdenk
1882c609719bSwdenk- Error Recovery:
1883c609719bSwdenk		CONFIG_PANIC_HANG
1884c609719bSwdenk
1885c609719bSwdenk		Define this variable to stop the system in case of a
1886c609719bSwdenk		fatal error, so that you have to reset it manually.
1887c609719bSwdenk		This is probably NOT a good idea for an embedded
188811ccc33fSMarcel Ziswiler		system where you want the system to reboot
1889c609719bSwdenk		automatically as fast as possible, but it may be
1890c609719bSwdenk		useful during development since you can try to debug
1891c609719bSwdenk		the conditions that lead to the situation.
1892c609719bSwdenk
1893c609719bSwdenk		CONFIG_NET_RETRY_COUNT
1894c609719bSwdenk
1895c609719bSwdenk		This variable defines the number of retries for
1896c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
1897c609719bSwdenk		before giving up the operation. If not defined, a
1898c609719bSwdenk		default value of 5 is used.
1899c609719bSwdenk
190040cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
190140cb90eeSGuennadi Liakhovetski
190240cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
190340cb90eeSGuennadi Liakhovetski
1904c609719bSwdenk- Command Interpreter:
19058078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
190604a85b3bSwdenk
190704a85b3bSwdenk		Enable auto completion of commands using TAB.
190804a85b3bSwdenk
19098078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
19108078f1a5SWolfgang Denk		for the "hush" shell.
19118078f1a5SWolfgang Denk
19128078f1a5SWolfgang Denk
19136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
1914c609719bSwdenk
1915c609719bSwdenk		Define this variable to enable the "hush" shell (from
1916c609719bSwdenk		Busybox) as command line interpreter, thus enabling
1917c609719bSwdenk		powerful command line syntax like
1918c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
1919c609719bSwdenk		constructs ("shell scripts").
1920c609719bSwdenk
1921c609719bSwdenk		If undefined, you get the old, much simpler behaviour
1922c609719bSwdenk		with a somewhat smaller memory footprint.
1923c609719bSwdenk
1924c609719bSwdenk
19256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
1926c609719bSwdenk
1927c609719bSwdenk		This defines the secondary prompt string, which is
1928c609719bSwdenk		printed when the command interpreter needs more input
1929c609719bSwdenk		to complete a command. Usually "> ".
1930c609719bSwdenk
1931c609719bSwdenk	Note:
1932c609719bSwdenk
1933c609719bSwdenk		In the current implementation, the local variables
1934c609719bSwdenk		space and global environment variables space are
1935c609719bSwdenk		separated. Local variables are those you define by
19363b57fe0aSwdenk		simply typing `name=value'. To access a local
1937c609719bSwdenk		variable later on, you have write `$name' or
19383b57fe0aSwdenk		`${name}'; to execute the contents of a variable
19393b57fe0aSwdenk		directly type `$name' at the command prompt.
1940c609719bSwdenk
1941c609719bSwdenk		Global environment variables are those you use
1942c609719bSwdenk		setenv/printenv to work with. To run a command stored
1943c609719bSwdenk		in such a variable, you need to use the run command,
1944c609719bSwdenk		and you must not use the '$' sign to access them.
1945c609719bSwdenk
1946c609719bSwdenk		To store commands and special characters in a
1947c609719bSwdenk		variable, please use double quotation marks
1948c609719bSwdenk		surrounding the whole text of the variable, instead
1949c609719bSwdenk		of the backslashes before semicolons and special
1950c609719bSwdenk		symbols.
1951c609719bSwdenk
1952aa0c71acSWolfgang Denk- Commandline Editing and History:
1953aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
1954aa0c71acSWolfgang Denk
195511ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
1956aa0c71acSWolfgang Denk		commandline input operations
1957aa0c71acSWolfgang Denk
1958a8c7c708Swdenk- Default Environment:
1959c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
1960c609719bSwdenk
1961c609719bSwdenk		Define this to contain any number of null terminated
1962c609719bSwdenk		strings (variable = value pairs) that will be part of
19637152b1d0Swdenk		the default environment compiled into the boot image.
19642262cfeeSwdenk
1965c609719bSwdenk		For example, place something like this in your
1966c609719bSwdenk		board's config file:
1967c609719bSwdenk
1968c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
1969c609719bSwdenk			"myvar1=value1\0" \
1970c609719bSwdenk			"myvar2=value2\0"
1971c609719bSwdenk
1972c609719bSwdenk		Warning: This method is based on knowledge about the
1973c609719bSwdenk		internal format how the environment is stored by the
19742262cfeeSwdenk		U-Boot code. This is NOT an official, exported
1975c609719bSwdenk		interface! Although it is unlikely that this format
19767152b1d0Swdenk		will change soon, there is no guarantee either.
1977c609719bSwdenk		You better know what you are doing here.
1978c609719bSwdenk
1979c609719bSwdenk		Note: overly (ab)use of the default environment is
1980c609719bSwdenk		discouraged. Make sure to check other ways to preset
198174de7aefSWolfgang Denk		the environment like the "source" command or the
1982c609719bSwdenk		boot command first.
1983c609719bSwdenk
1984a8c7c708Swdenk- DataFlash Support:
19852abbe075Swdenk		CONFIG_HAS_DATAFLASH
19862abbe075Swdenk
19872abbe075Swdenk		Defining this option enables DataFlash features and
19882abbe075Swdenk		allows to read/write in Dataflash via the standard
19892abbe075Swdenk		commands cp, md...
19902abbe075Swdenk
19913f85ce27Swdenk- SystemACE Support:
19923f85ce27Swdenk		CONFIG_SYSTEMACE
19933f85ce27Swdenk
19943f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
19953f85ce27Swdenk		chips attached via some sort of local bus. The address
199611ccc33fSMarcel Ziswiler		of the chip must also be defined in the
19976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
19983f85ce27Swdenk
19993f85ce27Swdenk		#define CONFIG_SYSTEMACE
20006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
20013f85ce27Swdenk
20023f85ce27Swdenk		When SystemACE support is added, the "ace" device type
20033f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
20043f85ce27Swdenk
2005ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2006ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2007ecb0ccd9SWolfgang Denk
200828cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2009ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
201028cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2011ecb0ccd9SWolfgang Denk		number generator is used.
2012ecb0ccd9SWolfgang Denk
201328cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
201428cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
201528cb9375SWolfgang Denk		defined, the normal port 69 is used.
201628cb9375SWolfgang Denk
201728cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2018ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2019ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2020ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2021ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2022ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2023ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2024ecb0ccd9SWolfgang Denk
2025a8c7c708Swdenk- Show boot progress:
2026c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2027c609719bSwdenk
2028c609719bSwdenk		Defining this option allows to add some board-
2029c609719bSwdenk		specific code (calling a user-provided function
2030c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2031c609719bSwdenk		the system's boot progress on some display (for
2032c609719bSwdenk		example, some LED's) on your board. At the moment,
2033c609719bSwdenk		the following checkpoints are implemented:
2034c609719bSwdenk
20358ae86b76SWolfgang Denk- Standalone program support:
20368ae86b76SWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
20378ae86b76SWolfgang Denk
20388ae86b76SWolfgang Denk		This option allows to define board specific values
20398ae86b76SWolfgang Denk		for the address where standalone program gets loaded,
20408ae86b76SWolfgang Denk		thus overwriting the architecutre dependent default
20418ae86b76SWolfgang Denk		settings.
20428ae86b76SWolfgang Denk
2043d32a1a4cSMinkyu Kang- Frame Buffer Address:
2044d32a1a4cSMinkyu Kang	CONFIG_FB_ADDR
2045d32a1a4cSMinkyu Kang
2046d32a1a4cSMinkyu Kang	Define CONFIG_FB_ADDR if you want to use specific address for
2047d32a1a4cSMinkyu Kang	frame buffer.
2048d32a1a4cSMinkyu Kang	Then system will reserve the frame buffer address to defined address
2049d32a1a4cSMinkyu Kang	instead of lcd_setmem (this function grab the memory for frame buffer
2050d32a1a4cSMinkyu Kang	by panel's size).
2051d32a1a4cSMinkyu Kang
2052d32a1a4cSMinkyu Kang	Please see board_init_f function.
2053d32a1a4cSMinkyu Kang
2054d32a1a4cSMinkyu Kang	If you want this config option then,
2055d32a1a4cSMinkyu Kang	please define it at your board config file
2056d32a1a4cSMinkyu Kang
20571372cce2SMarian BalakowiczLegacy uImage format:
20581372cce2SMarian Balakowicz
2059c609719bSwdenk  Arg	Where			When
2060c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2061c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2062c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2063c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2064c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2065c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2066c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2067c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2068c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
20691372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2070c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2071c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2072c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2073c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
20741372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2075c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
20761372cce2SMarian Balakowicz
20771372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
20781372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
20791372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
20801372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
20811372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
20821372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
20831372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
208411ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
20851372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
20861372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
20871372cce2SMarian Balakowicz
2088ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c	All preparation done, transferring control to OS
2089c609719bSwdenk
2090a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
209163e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
209263e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
209363e73c9aSwdenk
2094566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2095566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2096566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2097566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2098566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2099566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2100566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2101566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2102566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2103566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2104566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2105566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2106566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2107566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2108566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2109566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2110566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2111566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2112566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2113566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2114566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2115566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2116566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2117566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2118566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2119566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2120566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2121566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2122566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2123566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2124566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2125566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2126566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2127566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2128566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2129566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2130566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2131566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2132566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2133566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2134566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2135566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2136566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2137566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2138566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2139566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2140566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2141c609719bSwdenk
2142566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2143c609719bSwdenk
2144566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2145566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2146566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2147206c60cbSwdenk
2148566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2149566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
215011ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2151566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2152566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2153566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
215474de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
215574de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2156566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2157c609719bSwdenk
21581372cce2SMarian BalakowiczFIT uImage format:
21591372cce2SMarian Balakowicz
21601372cce2SMarian Balakowicz  Arg	Where			When
21611372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
21621372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
21631372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
21641372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
21651372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
21661372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2167f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
21681372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
21691372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
21701372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
21711372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
21721372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
217311ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
217411ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
21751372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
21761372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
21771372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
21781372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
21791372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
21801372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
21811372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
21821372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
21831372cce2SMarian Balakowicz
21841372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
21851372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
21861372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
218711ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
21881372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
21891372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
21901372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
21911372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
21921372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
21931372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
21941372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
21951372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
21961372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
21971372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
21981372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
21991372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
22001372cce2SMarian Balakowicz
220111ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
22021372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
22031372cce2SMarian Balakowicz
220411ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
22051372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
22061372cce2SMarian Balakowicz
220711ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
22081372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
22091372cce2SMarian Balakowicz
2210cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2211cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2212cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2213cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2214cccfc2abSDetlev Zundel
2215cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2216cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2217cccfc2abSDetlev Zundel
2218cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2219cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2220cccfc2abSDetlev Zundel
2221cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2222cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2223cccfc2abSDetlev Zundel
2224cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2225cccfc2abSDetlev Zundel
2226cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2227cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2228cccfc2abSDetlev Zundel
22291372cce2SMarian Balakowicz
2230c609719bSwdenkModem Support:
2231c609719bSwdenk--------------
2232c609719bSwdenk
223385ec0bccSwdenk[so far only for SMDK2400 and TRAB boards]
2234c609719bSwdenk
223511ccc33fSMarcel Ziswiler- Modem support enable:
2236c609719bSwdenk		CONFIG_MODEM_SUPPORT
2237c609719bSwdenk
2238c609719bSwdenk- RTS/CTS Flow control enable:
2239c609719bSwdenk		CONFIG_HWFLOW
2240c609719bSwdenk
2241c609719bSwdenk- Modem debug support:
2242c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
2243c609719bSwdenk
2244c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
2245c609719bSwdenk		for modem support. Useful only with BDI2000.
2246c609719bSwdenk
2247a8c7c708Swdenk- Interrupt support (PPC):
2248a8c7c708Swdenk
2249a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
2250a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
225111ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
2252a8c7c708Swdenk		should set decrementer_count to appropriate value. If
225311ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
2254a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
225511ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
2256a8c7c708Swdenk		specific handling. If board has watchdog / status_led
2257a8c7c708Swdenk		/ other_activity_monitor it works automatically from
2258a8c7c708Swdenk		general timer_interrupt().
2259a8c7c708Swdenk
2260c609719bSwdenk- General:
2261c609719bSwdenk
2262c609719bSwdenk		In the target system modem support is enabled when a
2263c609719bSwdenk		specific key (key combination) is pressed during
2264c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
226511ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
2266c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
2267c609719bSwdenk		function, returning 1 and thus enabling modem
2268c609719bSwdenk		initialization.
2269c609719bSwdenk
2270c609719bSwdenk		If there are no modem init strings in the
2271c609719bSwdenk		environment, U-Boot proceed to autoboot; the
2272c609719bSwdenk		previous output (banner, info printfs) will be
227311ccc33fSMarcel Ziswiler		suppressed, though.
2274c609719bSwdenk
2275c609719bSwdenk		See also: doc/README.Modem
2276c609719bSwdenk
2277c609719bSwdenk
2278c609719bSwdenkConfiguration Settings:
2279c609719bSwdenk-----------------------
2280c609719bSwdenk
22816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2282c609719bSwdenk		undefine this when you're short of memory.
2283c609719bSwdenk
22842fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
22852fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
22862fb2604dSPeter Tyser
22876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
2288c609719bSwdenk		prompt for user input.
2289c609719bSwdenk
22906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
2291c609719bSwdenk
22926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
2293c609719bSwdenk
22946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
2295c609719bSwdenk
22966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2297c609719bSwdenk		the application (usually a Linux kernel) when it is
2298c609719bSwdenk		booted
2299c609719bSwdenk
23006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
2301c609719bSwdenk		List of legal baudrate settings for this board.
2302c609719bSwdenk
23036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
2304c609719bSwdenk		Suppress display of console information at boot.
2305c609719bSwdenk
23066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
2307c609719bSwdenk		If the board specific function
2308c609719bSwdenk			extern int overwrite_console (void);
2309c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
2310c609719bSwdenk		serial port, else the settings in the environment are used.
2311c609719bSwdenk
23126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2313c609719bSwdenk		Enable the call to overwrite_console().
2314c609719bSwdenk
23156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2316c609719bSwdenk		Enable overwrite of previous console environment settings.
2317c609719bSwdenk
23186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2319c609719bSwdenk		Begin and End addresses of the area used by the
2320c609719bSwdenk		simple memory test.
2321c609719bSwdenk
23226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
2323c609719bSwdenk		Enable an alternate, more extensive memory test.
2324c609719bSwdenk
23256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
23265f535fe1Swdenk		Scratch address used by the alternate memory test
23275f535fe1Swdenk		You only need to set this if address zero isn't writeable
23285f535fe1Swdenk
23296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
23306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
233114f73ca6SStefan Roese		this specified memory area will get subtracted from the top
233211ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
233314f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
233414f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
233514f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
23365e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
233714f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
23385e12e75dSStefan Roese		will have to get fixed in Linux additionally.
233914f73ca6SStefan Roese
234014f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
234114f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
234214f73ca6SStefan Roese		be touched.
234314f73ca6SStefan Roese
234414f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
234514f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
234614f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
234714f73ca6SStefan Roese		non page size aligned address and this could cause major
234814f73ca6SStefan Roese		problems.
234914f73ca6SStefan Roese
23506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR:
2351c609719bSwdenk		Default load address for network file downloads
2352c609719bSwdenk
23536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
2354c609719bSwdenk		Enable temporary baudrate change while serial download
2355c609719bSwdenk
23566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
2357c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
2358c609719bSwdenk
23596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
2360c609719bSwdenk		Physical start address of Motherboard I/O (if using a
2361c609719bSwdenk		Cogent motherboard)
2362c609719bSwdenk
23636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
2364c609719bSwdenk		Physical start address of Flash memory.
2365c609719bSwdenk
23666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
2367c609719bSwdenk		Physical start address of boot monitor code (set by
2368c609719bSwdenk		make config files to be same as the text base address
236914d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
23706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
2371c609719bSwdenk
23726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
23733b57fe0aSwdenk		Size of memory reserved for monitor code, used to
23743b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
23753b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
23763b57fe0aSwdenk		flash sector.
2377c609719bSwdenk
23786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
2379c609719bSwdenk		Size of DRAM reserved for malloc() use.
2380c609719bSwdenk
23816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
238215940c9aSStefan Roese		Normally compressed uImages are limited to an
238315940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
23846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
238515940c9aSStefan Roese		to adjust this setting to your needs.
2386c609719bSwdenk
23876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
2388c609719bSwdenk		Maximum size of memory mapped by the startup code of
2389c609719bSwdenk		the Linux kernel; all data that must be processed by
23907d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
23917d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
23927d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
23937d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
2394c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.  The environment
2395c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
2396c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
2397c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
2398c609719bSwdenk
2399fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
2400fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
2401fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
2402fca43cc8SJohn Rigby		is enabled.
2403fca43cc8SJohn Rigby
2404fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
2405fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
2406fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
2407fca43cc8SJohn Rigby
2408fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
2409fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
2410fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
2411fca43cc8SJohn Rigby
24126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
2413c609719bSwdenk		Max number of Flash memory banks
2414c609719bSwdenk
24156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
2416c609719bSwdenk		Max number of sectors on a Flash chip
2417c609719bSwdenk
24186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
2419c609719bSwdenk		Timeout for Flash erase operations (in ms)
2420c609719bSwdenk
24216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
2422c609719bSwdenk		Timeout for Flash write operations (in ms)
2423c609719bSwdenk
24246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
24258564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
24268564acf9Swdenk
24276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
24288564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
24298564acf9Swdenk
24306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
24318564acf9Swdenk		If defined, hardware flash sectors protection is used
24328564acf9Swdenk		instead of U-Boot software protection.
24338564acf9Swdenk
24346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
2435c609719bSwdenk
2436c609719bSwdenk		Enable TFTP transfers directly to flash memory;
2437c609719bSwdenk		without this option such a download has to be
2438c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
2439c609719bSwdenk		copy from RAM to flash.
2440c609719bSwdenk
2441c609719bSwdenk		The two-step approach is usually more reliable, since
2442c609719bSwdenk		you can check if the download worked before you erase
244311ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
244411ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
2445c609719bSwdenk		downloaded image) this option may be very useful.
2446c609719bSwdenk
24476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
2448c609719bSwdenk		Define if the flash driver uses extra elements in the
24495653fc33Swdenk		common flash structure for storing flash geometry.
24505653fc33Swdenk
245100b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
24525653fc33Swdenk		This option also enables the building of the cfi_flash driver
24535653fc33Swdenk		in the drivers directory
245453cf9435Sstroese
245591809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
245691809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
245791809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
245891809ed5SPiotr Ziecik		to the MTD layer.
245991809ed5SPiotr Ziecik
24606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
246196ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
246296ef831fSGuennadi Liakhovetski
246396ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
246496ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
246596ef831fSGuennadi Liakhovetski		write commands.
246696ef831fSGuennadi Liakhovetski
24676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
24685568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
24695568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
24705568e613SStefan Roese		is useful, if some of the configured banks are only
24715568e613SStefan Roese		optionally available.
24725568e613SStefan Roese
24739a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
24749a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
24759a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
24769a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
24779a042e9cSJerry Van Baren
24786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
247911ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
248011ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
248153cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
248253cf9435Sstroese		buffers can be full shortly after enabling the interface
248311ccc33fSMarcel Ziswiler		on high Ethernet traffic.
248453cf9435Sstroese		Defaults to 4 if not defined.
2485c609719bSwdenk
2486ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
2487ea882bafSWolfgang Denk
2488ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
2489ea882bafSWolfgang Denk	internally to store the environment settings. The default
2490ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
2491ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
2492ea882bafSWolfgang Denk	lib/hashtable.c for details.
2493ea882bafSWolfgang Denk
2494c609719bSwdenkThe following definitions that deal with the placement and management
2495c609719bSwdenkof environment data (variable area); in general, we support the
2496c609719bSwdenkfollowing configurations:
2497c609719bSwdenk
24985a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
2499c609719bSwdenk
2500c609719bSwdenk	Define this if the environment is in flash memory.
2501c609719bSwdenk
2502c609719bSwdenk	a) The environment occupies one whole flash sector, which is
2503c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
2504c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
2505c609719bSwdenk	   sector" type flash chips, which have several smaller
2506c609719bSwdenk	   sectors at the start or the end. For instance, such a
2507c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2508c609719bSwdenk	   such a case you would place the environment in one of the
2509c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
2510c609719bSwdenk	   "top boot sector" type flash chips, you would put the
2511c609719bSwdenk	   environment in one of the last sectors, leaving a gap
2512c609719bSwdenk	   between U-Boot and the environment.
2513c609719bSwdenk
25140e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
2515c609719bSwdenk
2516c609719bSwdenk	   Offset of environment data (variable area) to the
2517c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
2518c609719bSwdenk	   type flash chips the second sector can be used: the offset
2519c609719bSwdenk	   for this sector is given here.
2520c609719bSwdenk
25216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
2522c609719bSwdenk
25230e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
2524c609719bSwdenk
2525c609719bSwdenk	   This is just another way to specify the start address of
2526c609719bSwdenk	   the flash sector containing the environment (instead of
25270e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
2528c609719bSwdenk
25290e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
2530c609719bSwdenk
2531c609719bSwdenk	   Size of the sector containing the environment.
2532c609719bSwdenk
2533c609719bSwdenk
2534c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
2535c609719bSwdenk	   In such a case you don't want to spend a whole sector for
2536c609719bSwdenk	   the environment.
2537c609719bSwdenk
25380e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2539c609719bSwdenk
25405a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
25410e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
2542c609719bSwdenk	   of this flash sector for the environment. This saves
2543c609719bSwdenk	   memory for the RAM copy of the environment.
2544c609719bSwdenk
2545c609719bSwdenk	   It may also save flash memory if you decide to use this
2546c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
2547c609719bSwdenk	   since then the remainder of the flash sector could be used
2548c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
2549c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
2550c609719bSwdenk	   updating the environment in flash makes it always
2551c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
2552c609719bSwdenk	   wrong before the contents has been restored from a copy in
2553c609719bSwdenk	   RAM, your target system will be dead.
2554c609719bSwdenk
25550e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
25560e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
2557c609719bSwdenk
2558c609719bSwdenk	   These settings describe a second storage area used to hold
255911ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
25603e38691eSwdenk	   a valid backup copy in case there is a power failure during
2561c609719bSwdenk	   a "saveenv" operation.
2562c609719bSwdenk
2563c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
2564c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
2565c609719bSwdenkaccordingly!
2566c609719bSwdenk
2567c609719bSwdenk
25689314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
2569c609719bSwdenk
2570c609719bSwdenk	Define this if you have some non-volatile memory device
2571c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
2572c609719bSwdenk	environment.
2573c609719bSwdenk
25740e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
25750e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2576c609719bSwdenk
257711ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
2578c609719bSwdenk	  want to use for environment. It is assumed that this memory
2579c609719bSwdenk	  can just be read and written to, without any special
2580c609719bSwdenk	  provision.
2581c609719bSwdenk
2582c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
2583c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
258411ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
2585c609719bSwdenkU-Boot will hang.
2586c609719bSwdenk
2587c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
2588c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
2589c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
2590c609719bSwdenkto save the current settings.
2591c609719bSwdenk
2592c609719bSwdenk
2593bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
2594c609719bSwdenk
2595c609719bSwdenk	Use this if you have an EEPROM or similar serial access
2596c609719bSwdenk	device and a driver for it.
2597c609719bSwdenk
25980e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
25990e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2600c609719bSwdenk
2601c609719bSwdenk	  These two #defines specify the offset and size of the
2602c609719bSwdenk	  environment area within the total memory of your EEPROM.
2603c609719bSwdenk
26046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
2605c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
2606c609719bSwdenk	  The default address is zero.
2607c609719bSwdenk
26086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
2609c609719bSwdenk	  If defined, the number of bits used to address bytes in a
2610c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
2611c609719bSwdenk	  would require six bits.
2612c609719bSwdenk
26136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
2614c609719bSwdenk	  If defined, the number of milliseconds to delay between
2615c609719bSwdenk	  page writes.	The default is zero milliseconds.
2616c609719bSwdenk
26176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
2618c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
2619c609719bSwdenk	  that this is NOT the chip address length!
2620c609719bSwdenk
26216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
26225cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
26235cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
26245cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
26255cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
26265cf91d6bSwdenk	  byte chips.
26275cf91d6bSwdenk
26285cf91d6bSwdenk	  Note that we consider the length of the address field to
26295cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
26305cf91d6bSwdenk	  in the chip address.
26315cf91d6bSwdenk
26326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
2633c609719bSwdenk	  The size in bytes of the EEPROM device.
2634c609719bSwdenk
2635548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
2636548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
2637548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
2638548738b4SHeiko Schocher
2639548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
2640548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
2641548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
2642548738b4SHeiko Schocher	  EEPROM. For example:
2643548738b4SHeiko Schocher
2644548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
2645548738b4SHeiko Schocher
2646548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
2647548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
2648c609719bSwdenk
2649057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
26505779d8d9Swdenk
26515779d8d9Swdenk	Define this if you have a DataFlash memory device which you
26525779d8d9Swdenk	want to use for the environment.
26535779d8d9Swdenk
26540e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
26550e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
26560e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
26575779d8d9Swdenk
26585779d8d9Swdenk	  These three #defines specify the offset and size of the
26595779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
26605779d8d9Swdenk	  at the specified address.
26615779d8d9Swdenk
266251bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
266313a5695bSwdenk
266413a5695bSwdenk	Define this if you have a NAND device which you want to use
266513a5695bSwdenk	for the environment.
266613a5695bSwdenk
26670e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
26680e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
266913a5695bSwdenk
267013a5695bSwdenk	  These two #defines specify the offset and size of the environment
2671fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
2672fdd813deSScott Wood	  aligned to an erase block boundary.
26735779d8d9Swdenk
2674fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
2675e443c944SMarkus Klotzbuecher
26760e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
2677fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
2678fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
2679fdd813deSScott Wood	  during a "saveenv" operation.  CONFIG_ENV_OFFSET_RENDUND must be
2680fdd813deSScott Wood	  aligned to an erase block boundary.
2681e443c944SMarkus Klotzbuecher
2682fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
2683fdd813deSScott Wood
2684fdd813deSScott Wood	  Specifies the length of the region in which the environment
2685fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
2686fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
2687fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
2688fdd813deSScott Wood	  the range to be avoided.
2689fdd813deSScott Wood
2690fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
2691fdd813deSScott Wood
2692fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
2693fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
2694fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
2695fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
2696fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
2697e443c944SMarkus Klotzbuecher
2698b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
2699b74ab737SGuennadi Liakhovetski
2700b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
2701b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
2702b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
2703b74ab737SGuennadi Liakhovetski
27046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
2705c609719bSwdenk
2706c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
2707c609719bSwdenk	area is used at an early stage (ROM part) if the environment
2708c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
2709c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
2710c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2711c609719bSwdenk	to be a good choice since it makes it far enough from the
2712c609719bSwdenk	start of the data area as well as from the stack pointer.
2713c609719bSwdenk
2714e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
2715c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
2716cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
2717c609719bSwdenkuntil then to read environment variables.
2718c609719bSwdenk
271985ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
272085ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
272185ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
272285ec0bccSwdenknecessary, because the first environment variable we need is the
272385ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
272485ec0bccSwdenkhave any device yet where we could complain.]
2725c609719bSwdenk
2726c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
2727c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
272885ec0bccSwdenkuse the "saveenv" command to store a valid environment.
2729c609719bSwdenk
27306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
2731fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
2732fc3e2165Swdenk
27336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
2734fc3e2165Swdenk		      also needs to be defined.
2735fc3e2165Swdenk
27366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
2737fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
2738c609719bSwdenk
2739f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
2740f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
2741f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
2742f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
2743f5675aa5SRon Madrid		space for already greatly restricted images, including but not
2744f5675aa5SRon Madrid		limited to NAND_SPL configurations.
2745f5675aa5SRon Madrid
2746c609719bSwdenkLow Level (hardware related) configuration options:
2747dc7c9a1aSwdenk---------------------------------------------------
2748c609719bSwdenk
27496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
2750c609719bSwdenk		Cache Line Size of the CPU.
2751c609719bSwdenk
27526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
2753c609719bSwdenk		Default address of the IMMR after system reset.
27542535d602Swdenk
27552535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
27562535d602Swdenk		and RPXsuper) to be able to adjust the position of
27572535d602Swdenk		the IMMR register after a reset.
2758c609719bSwdenk
27597f6c2cbcSwdenk- Floppy Disk Support:
27606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
27617f6c2cbcSwdenk
27627f6c2cbcSwdenk		the default drive number (default value 0)
27637f6c2cbcSwdenk
27646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
27657f6c2cbcSwdenk
276611ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
27677f6c2cbcSwdenk		(default value 1)
27687f6c2cbcSwdenk
27696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
27707f6c2cbcSwdenk
27717f6c2cbcSwdenk		defines the offset of register from address. It
27727f6c2cbcSwdenk		depends on which part of the data bus is connected to
277311ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
27747f6c2cbcSwdenk
27756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
27766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
27777f6c2cbcSwdenk		default value.
27787f6c2cbcSwdenk
27796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
27807f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
27817f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
27827f6c2cbcSwdenk		source code. It is used to make hardware dependant
27837f6c2cbcSwdenk		initializations.
27847f6c2cbcSwdenk
27850abddf82SMacpaul Lin- CONFIG_IDE_AHB:
27860abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
27870abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
27880abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
27890abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
27900abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
27910abddf82SMacpaul Lin		is requierd.
27920abddf82SMacpaul Lin
27936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
279425d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
279525d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
2796c609719bSwdenk
27976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
2798c609719bSwdenk
27997152b1d0Swdenk		Start address of memory area that can be used for
2800c609719bSwdenk		initial data and stack; please note that this must be
2801c609719bSwdenk		writable memory that is working WITHOUT special
2802c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
2803c609719bSwdenk		will become available only after programming the
2804c609719bSwdenk		memory controller and running certain initialization
2805c609719bSwdenk		sequences.
2806c609719bSwdenk
2807c609719bSwdenk		U-Boot uses the following memory types:
2808c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
2809c609719bSwdenk		- MPC824X: data cache
2810c609719bSwdenk		- PPC4xx:  data cache
2811c609719bSwdenk
28126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
2813c609719bSwdenk
2814c609719bSwdenk		Offset of the initial data structure in the memory
28156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
28166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
2817c609719bSwdenk		data is located at the end of the available space
2818553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
28196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
28206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
28216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
2822c609719bSwdenk
2823c609719bSwdenk	Note:
2824c609719bSwdenk		On the MPC824X (or other systems that use the data
2825c609719bSwdenk		cache for initial memory) the address chosen for
28266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
2827c609719bSwdenk		point to an otherwise UNUSED address space between
2828c609719bSwdenk		the top of RAM and the start of the PCI space.
2829c609719bSwdenk
28306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
2831c609719bSwdenk
28326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
2833c609719bSwdenk
28346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
2835c609719bSwdenk
28366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
2837c609719bSwdenk
28386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
2839c609719bSwdenk
28406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
2841c609719bSwdenk
28426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
2843c609719bSwdenk		SDRAM timing
2844c609719bSwdenk
28456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
2846c609719bSwdenk		periodic timer for refresh
2847c609719bSwdenk
28486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
2849c609719bSwdenk
28506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
28516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
28526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
28536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
2854c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
2855c609719bSwdenk
2856c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
28576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
28586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
2859c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
2860c609719bSwdenk
28616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
28626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
2863c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
2864c609719bSwdenk		Prescaler definitions (SDRAM timing)
2865c609719bSwdenk
28666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
2867c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
2868c609719bSwdenk		define relocation offset in DPRAM [DSP2]
2869c609719bSwdenk
28706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
2871b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
2872b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
2873b423d055SHeiko Schocher
28746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
2875c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
2876c609719bSwdenk		define relocation offset in DPRAM [SCC4]
2877c609719bSwdenk
28786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
2879c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
2880c609719bSwdenk		wrong setting might damage your board. Read
2881c609719bSwdenk		doc/README.MBX before setting this variable!
2882c609719bSwdenk
28836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
2884ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
2885ea909b76Swdenk		(Power On Self Tests). This definition overrides
2886ea909b76Swdenk		#define'd default value in commproc.h resp.
2887ea909b76Swdenk		cpm_8260.h.
2888ea909b76Swdenk
28896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
28906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
28916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
28926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
28936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
28946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
28956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
28966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
2897a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
28985d232d0eSwdenk
28999cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
29009cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
29019cacf4fcSDirk Eibach		required.
29029cacf4fcSDirk Eibach
2903a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
2904a09b9b68SKumar Gala		Chip has SRIO or not
2905a09b9b68SKumar Gala
2906a09b9b68SKumar Gala- CONFIG_SRIO1:
2907a09b9b68SKumar Gala		Board has SRIO 1 port available
2908a09b9b68SKumar Gala
2909a09b9b68SKumar Gala- CONFIG_SRIO2:
2910a09b9b68SKumar Gala		Board has SRIO 2 port available
2911a09b9b68SKumar Gala
2912a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
2913a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
2914a09b9b68SKumar Gala
2915a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
2916a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
2917a09b9b68SKumar Gala
2918a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
2919a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
2920a09b9b68SKumar Gala
2921bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
2922218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
2923218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
2924218ca724SWolfgang Denk
2925bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
2926bb99ad6dSBen Warren		I2C address of the SPD EEPROM
2927bb99ad6dSBen Warren
29286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
2929218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
2930218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
2931218ca724SWolfgang Denk		to something your driver can deal with.
2932bb99ad6dSBen Warren
29336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
2934218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
2935218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
29362ad6b513STimur Tabi
2937c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
2938c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
2939c26e454dSwdenk
2940c26e454dSwdenk- CONFIG_FEC[12]_PHY
2941c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
29426e592385Swdenk		to the given FEC; i. e.
2943c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
2944c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
2945c26e454dSwdenk
2946c26e454dSwdenk		When set to -1, means to probe for first available.
2947c26e454dSwdenk
2948c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
2949c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
2950c26e454dSwdenk		(so program the FEC to ignore it).
2951c26e454dSwdenk
2952c26e454dSwdenk- CONFIG_RMII
2953c26e454dSwdenk		Enable RMII mode for all FECs.
2954c26e454dSwdenk		Note that this is a global option, we can't
2955c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
2956c26e454dSwdenk
29575cf91d6bSwdenk- CONFIG_CRC32_VERIFY
29585cf91d6bSwdenk		Add a verify option to the crc32 command.
29595cf91d6bSwdenk		The syntax is:
29605cf91d6bSwdenk
29615cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
29625cf91d6bSwdenk
29635cf91d6bSwdenk		Where address/count indicate a memory area
29645cf91d6bSwdenk		and crc32 is the correct crc32 which the
29655cf91d6bSwdenk		area should have.
29665cf91d6bSwdenk
296756523f12Swdenk- CONFIG_LOOPW
296856523f12Swdenk		Add the "loopw" memory command. This only takes effect if
2969602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
297056523f12Swdenk
29717b466641Sstroese- CONFIG_MX_CYCLIC
29727b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
29737b466641Sstroese		"md/mw" commands.
29747b466641Sstroese		Examples:
29757b466641Sstroese
29767b466641Sstroese		=> mdc.b 10 4 500
29777b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
29787b466641Sstroese
29797b466641Sstroese		=> mwc.l 100 12345678 10
29807b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
29817b466641Sstroese
29827b466641Sstroese		This only takes effect if the memory commands are activated
2983602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
29847b466641Sstroese
29858aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
2986e03f3169SWolfgang Denk		[ARM only] If this variable is defined, then certain
2987e03f3169SWolfgang Denk		low level initializations (like setting up the memory
2988e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
2989e03f3169SWolfgang Denk		relocate itself into RAM.
29908aa1a2d1Swdenk
2991e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
2992e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
2993e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
2994e03f3169SWolfgang Denk		these initializations itself.
29958aa1a2d1Swdenk
2996df81238bSMagnus Lilja- CONFIG_PRELOADER
2997df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
2998df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
2999df81238bSMagnus Lilja		compiling a NAND SPL.
3000400558b5Swdenk
3001d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
3002d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
3003d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
3004d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
3005d8834a13SMatthias Weisser		conditions but may increase the binary size.
3006d8834a13SMatthias Weisser
3007c609719bSwdenkBuilding the Software:
3008c609719bSwdenk======================
3009c609719bSwdenk
3010218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
3011218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
3012218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
3013218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
3014218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3015218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
3016c609719bSwdenk
3017218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
3018218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
3019218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
3020218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
3021218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
3022c609719bSwdenk
3023218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
3024218ca724SWolfgang Denk	$ export CROSS_COMPILE
3025c609719bSwdenk
30262f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
30272f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
30282f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
30292f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
30302f8d396bSPeter Tyser
30312f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
30322f8d396bSPeter Tyser
30332f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
30342f8d396bSPeter Tyser      be executed on computers running Windows.
30352f8d396bSPeter Tyser
3036c609719bSwdenkU-Boot is intended to be simple to build. After installing the
3037c609719bSwdenksources you must configure U-Boot for one specific board type. This
3038c609719bSwdenkis done by typing:
3039c609719bSwdenk
3040c609719bSwdenk	make NAME_config
3041c609719bSwdenk
3042218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
3043218ca724SWolfgang Denkrations; see the main Makefile for supported names.
304454387ac9Swdenk
3045c609719bSwdenkNote: for some board special configuration names may exist; check if
3046c609719bSwdenk      additional information is available from the board vendor; for
30472729af9dSwdenk      instance, the TQM823L systems are available without (standard)
30482729af9dSwdenk      or with LCD support. You can select such additional "features"
304911ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
3050c609719bSwdenk
30512729af9dSwdenk      make TQM823L_config
30522729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
3053c609719bSwdenk
3054c609719bSwdenk      make TQM823L_LCD_config
3055c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
3056c609719bSwdenk
3057c609719bSwdenk      etc.
3058c609719bSwdenk
3059c609719bSwdenk
3060c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
30617152b1d0Swdenkimages ready for download to / installation on your system:
3062c609719bSwdenk
3063c609719bSwdenk- "u-boot.bin" is a raw binary image
3064c609719bSwdenk- "u-boot" is an image in ELF binary format
3065c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
3066c609719bSwdenk
3067baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
3068baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
3069baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
3070baf31249SMarian Balakowicz
3071baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
3072baf31249SMarian Balakowicz
3073baf31249SMarian Balakowicz	make O=/tmp/build distclean
3074baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
3075baf31249SMarian Balakowicz	make O=/tmp/build all
3076baf31249SMarian Balakowicz
3077baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
3078baf31249SMarian Balakowicz
3079baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3080baf31249SMarian Balakowicz	make distclean
3081baf31249SMarian Balakowicz	make NAME_config
3082baf31249SMarian Balakowicz	make all
3083baf31249SMarian Balakowicz
3084baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
3085baf31249SMarian Balakowiczvariable.
3086baf31249SMarian Balakowicz
3087c609719bSwdenk
3088c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
3089c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
3090c609719bSwdenknative "make".
3091c609719bSwdenk
3092c609719bSwdenk
3093c609719bSwdenkIf the system board that you have is not listed, then you will need
3094c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
3095c609719bSwdenksteps:
3096c609719bSwdenk
3097c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
309885ec0bccSwdenk    "Makefile" and to the "MAKEALL" script, using the existing
309985ec0bccSwdenk    entries as examples. Note that here and at many other places
31007152b1d0Swdenk    boards and other names are listed in alphabetical sort order. Please
310185ec0bccSwdenk    keep this order.
3102c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
310385ec0bccSwdenk    files you need. In your board directory, you will need at least
310485ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
310585ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
310685ec0bccSwdenk    your board
3107c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
3108c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
310985ec0bccSwdenk4.  Run "make <board>_config" with your new name.
3110c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
3111c609719bSwdenk    to be installed on your target system.
311285ec0bccSwdenk6.  Debug and solve any problems that might arise.
3113c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
3114c609719bSwdenk
3115c609719bSwdenk
3116c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
3117c609719bSwdenk==============================================================
3118c609719bSwdenk
3119c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
3120c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
3121c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
3122c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
3123218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
3124c609719bSwdenk
3125c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
3126c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
3127c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
3128c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
3129c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
31307152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
3131218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
3132218ca724SWolfgang Denkyou can type
3133c609719bSwdenk
3134c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
3135c609719bSwdenk
3136c609719bSwdenkor to build on a native PowerPC system you can type
3137c609719bSwdenk
3138c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
3139c609719bSwdenk
3140218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
3141218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
3142218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
3143218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
3144218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
3145218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
3146218ca724SWolfgang Denkvariable. For example:
3147baf31249SMarian Balakowicz
3148baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3149baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
3150baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
3151baf31249SMarian Balakowicz
3152218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
3153218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
3154218ca724SWolfgang Denkduring the whole build process.
3155baf31249SMarian Balakowicz
3156baf31249SMarian Balakowicz
3157c609719bSwdenkSee also "U-Boot Porting Guide" below.
3158c609719bSwdenk
3159c609719bSwdenk
3160c609719bSwdenkMonitor Commands - Overview:
3161c609719bSwdenk============================
3162c609719bSwdenk
3163c609719bSwdenkgo	- start application at address 'addr'
3164c609719bSwdenkrun	- run commands in an environment variable
3165c609719bSwdenkbootm	- boot application image from memory
3166c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
3167c609719bSwdenktftpboot- boot image via network using TFTP protocol
3168c609719bSwdenk	       and env variables "ipaddr" and "serverip"
3169c609719bSwdenk	       (and eventually "gatewayip")
3170c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
3171c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
3172c609719bSwdenkloads	- load S-Record file over serial line
3173c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
3174c609719bSwdenkmd	- memory display
3175c609719bSwdenkmm	- memory modify (auto-incrementing)
3176c609719bSwdenknm	- memory modify (constant address)
3177c609719bSwdenkmw	- memory write (fill)
3178c609719bSwdenkcp	- memory copy
3179c609719bSwdenkcmp	- memory compare
3180c609719bSwdenkcrc32	- checksum calculation
31810f89c54bSPeter Tyseri2c	- I2C sub-system
3182c609719bSwdenksspi	- SPI utility commands
3183c609719bSwdenkbase	- print or set address offset
3184c609719bSwdenkprintenv- print environment variables
3185c609719bSwdenksetenv	- set environment variables
3186c609719bSwdenksaveenv - save environment variables to persistent storage
3187c609719bSwdenkprotect - enable or disable FLASH write protection
3188c609719bSwdenkerase	- erase FLASH memory
3189c609719bSwdenkflinfo	- print FLASH memory information
3190c609719bSwdenkbdinfo	- print Board Info structure
3191c609719bSwdenkiminfo	- print header information for application image
3192c609719bSwdenkconinfo - print console devices and informations
3193c609719bSwdenkide	- IDE sub-system
3194c609719bSwdenkloop	- infinite loop on address range
319556523f12Swdenkloopw	- infinite write loop on address range
3196c609719bSwdenkmtest	- simple RAM test
3197c609719bSwdenkicache	- enable or disable instruction cache
3198c609719bSwdenkdcache	- enable or disable data cache
3199c609719bSwdenkreset	- Perform RESET of the CPU
3200c609719bSwdenkecho	- echo args to console
3201c609719bSwdenkversion - print monitor version
3202c609719bSwdenkhelp	- print online help
3203c609719bSwdenk?	- alias for 'help'
3204c609719bSwdenk
3205c609719bSwdenk
3206c609719bSwdenkMonitor Commands - Detailed Description:
3207c609719bSwdenk========================================
3208c609719bSwdenk
3209c609719bSwdenkTODO.
3210c609719bSwdenk
3211c609719bSwdenkFor now: just type "help <command>".
3212c609719bSwdenk
3213c609719bSwdenk
3214c609719bSwdenkEnvironment Variables:
3215c609719bSwdenk======================
3216c609719bSwdenk
3217c609719bSwdenkU-Boot supports user configuration using Environment Variables which
3218c609719bSwdenkcan be made persistent by saving to Flash memory.
3219c609719bSwdenk
3220c609719bSwdenkEnvironment Variables are set using "setenv", printed using
3221c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
3222c609719bSwdenkwithout a value can be used to delete a variable from the
3223c609719bSwdenkenvironment. As long as you don't save the environment you are
3224c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
3225c609719bSwdenkenvironment is erased by accident, a default environment is provided.
3226c609719bSwdenk
3227c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
3228c96f86eeSWolfgang Denk
3229c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
3230c609719bSwdenk
3231c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
3232c609719bSwdenk
3233c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
3234c609719bSwdenk
3235c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
3236c609719bSwdenk
3237c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
3238c609719bSwdenk
3239c609719bSwdenk  bootfile	- Name of the image to load with TFTP
3240c609719bSwdenk
32417d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
32427d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
32437d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
32447d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
32457d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
32467d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
3247c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
3248c3624e6eSGrant Likely		  bootm_mapsize.
3249c3624e6eSGrant Likely
3250c3624e6eSGrant Likely  bootm_mapsize	- Size of the initial memory mapping for the Linux kernel.
3251c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
3252c3624e6eSGrant Likely		  defines the size of the memory region starting at base
3253c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
3254c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
3255c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
3256c3624e6eSGrant Likely		  used otherwise.
32577d721e34SBartlomiej Sieka
32587d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
32597d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
32607d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
32617d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
32627d721e34SBartlomiej Sieka		  environment variable.
32637d721e34SBartlomiej Sieka
32644bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
32654bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
32664bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
32674bae9090SBartlomiej Sieka
3268c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
3269c609719bSwdenk		  "bootp" will just load perform a lookup of the
3270c609719bSwdenk		  configuration from the BOOTP server, but not try to
3271c609719bSwdenk		  load any image using TFTP
3272c609719bSwdenk
3273c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
3274c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
3275c609719bSwdenk		  be automatically started (by internally calling
3276c609719bSwdenk		  "bootm")
3277c609719bSwdenk
32784a6fd34bSwdenk		  If set to "no", a standalone image passed to the
32794a6fd34bSwdenk		  "bootm" command will be copied to the load address
32804a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
32814a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
32824a6fd34bSwdenk		  data.
32834a6fd34bSwdenk
328417ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
328517ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
328617ea1177Swdenk		  mode (400kHZ). This environment variable is used in
328717ea1177Swdenk		  initialization code. So, for changes to be effective
328817ea1177Swdenk		  it must be saved and board must be reset.
328917ea1177Swdenk
3290c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
3291c609719bSwdenk		  If this variable is not set, initrd images will be
3292c609719bSwdenk		  copied to the highest possible address in RAM; this
3293c609719bSwdenk		  is usually what you want since it allows for
3294c609719bSwdenk		  maximum initrd size. If for some reason you want to
3295c609719bSwdenk		  make sure that the initrd image is loaded below the
32966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
3297c609719bSwdenk		  variable to a value of "no" or "off" or "0".
3298c609719bSwdenk		  Alternatively, you can set it to a maximum upper
3299c609719bSwdenk		  address to use (U-Boot will still check that it
3300c609719bSwdenk		  does not overwrite the U-Boot stack and data).
3301c609719bSwdenk
3302c609719bSwdenk		  For instance, when you have a system with 16 MB
33037152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
3304c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
3305c609719bSwdenk		  the "bootargs" variable. However, now you must make
33067152b1d0Swdenk		  sure that the initrd image is placed in the first
3307c609719bSwdenk		  12 MB as well - this can be done with
3308c609719bSwdenk
3309c609719bSwdenk		  setenv initrd_high 00c00000
3310c609719bSwdenk
331138b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
331238b99261Swdenk		  indication to U-Boot that all addresses are legal
331338b99261Swdenk		  for the Linux kernel, including addresses in flash
331438b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
331538b99261Swdenk		  ramdisk at all. This may be useful to reduce the
331638b99261Swdenk		  boot time on your system, but requires that this
331738b99261Swdenk		  feature is supported by your Linux kernel.
331838b99261Swdenk
3319c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
3320c609719bSwdenk
3321c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
3322dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
3323c609719bSwdenk
3324c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
3325c609719bSwdenk
3326c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
3327c609719bSwdenk
3328c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
3329c609719bSwdenk
3330c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
3331c609719bSwdenk
3332c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
3333c609719bSwdenk
3334a3d991bdSwdenk  ethprime	- When CONFIG_NET_MULTI is enabled controls which
3335a3d991bdSwdenk		  interface is used first.
3336a3d991bdSwdenk
3337a3d991bdSwdenk  ethact	- When CONFIG_NET_MULTI is enabled controls which
3338a3d991bdSwdenk		  interface is currently active. For example you
3339a3d991bdSwdenk		  can do the following
3340a3d991bdSwdenk
334148690d80SHeiko Schocher		  => setenv ethact FEC
334248690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
334348690d80SHeiko Schocher		  => setenv ethact SCC
334448690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
3345a3d991bdSwdenk
3346e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
3347e1692577SMatthias Fuchs		  available network interfaces.
3348e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
3349e1692577SMatthias Fuchs
3350a3d991bdSwdenk  netretry	- When set to "no" each network operation will
3351a3d991bdSwdenk		  either succeed or fail without retrying.
33526e592385Swdenk		  When set to "once" the network operation will
33536e592385Swdenk		  fail when all the available network interfaces
33546e592385Swdenk		  are tried once without success.
3355a3d991bdSwdenk		  Useful on scripts which control the retry operation
3356a3d991bdSwdenk		  themselves.
3357a3d991bdSwdenk
3358b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
3359a1cf027aSJean-Christophe PLAGNIOL-VILLARD
336028cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
3361ecb0ccd9SWolfgang Denk		  UDP source port.
3362ecb0ccd9SWolfgang Denk
336328cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
336428cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
336528cb9375SWolfgang Denk
3366c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
3367c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
3368c96f86eeSWolfgang Denk
3369c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
3370c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
3371c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
3372c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
3373c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
3374c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
3375c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
3376c96f86eeSWolfgang Denk
3377a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
337811ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
3379a3d991bdSwdenk		  VLAN tagged frames.
3380c609719bSwdenk
3381c609719bSwdenkThe following environment variables may be used and automatically
3382c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
3383c609719bSwdenkdepending the information provided by your boot server:
3384c609719bSwdenk
3385c609719bSwdenk  bootfile	- see above
3386c609719bSwdenk  dnsip		- IP address of your Domain Name Server
3387fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
3388c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
3389c609719bSwdenk  hostname	- Target hostname
3390c609719bSwdenk  ipaddr	- see above
3391c609719bSwdenk  netmask	- Subnet Mask
3392c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
3393c609719bSwdenk  serverip	- see above
3394c609719bSwdenk
3395c609719bSwdenk
3396c609719bSwdenkThere are two special Environment Variables:
3397c609719bSwdenk
3398c609719bSwdenk  serial#	- contains hardware identification information such
3399c609719bSwdenk		  as type string and/or serial number
3400c609719bSwdenk  ethaddr	- Ethernet address
3401c609719bSwdenk
3402c609719bSwdenkThese variables can be set only once (usually during manufacturing of
3403c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
3404c609719bSwdenkonce they have been set once.
3405c609719bSwdenk
3406c609719bSwdenk
3407c1551ea8SstroeseFurther special Environment Variables:
3408c1551ea8Sstroese
3409c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
3410c1551ea8Sstroese		  with the "version" command. This variable is
3411c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
3412c1551ea8Sstroese
3413c1551ea8Sstroese
3414c609719bSwdenkPlease note that changes to some configuration parameters may take
3415c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
3416c609719bSwdenk
3417c609719bSwdenk
3418f07771ccSwdenkCommand Line Parsing:
3419f07771ccSwdenk=====================
3420f07771ccSwdenk
3421f07771ccSwdenkThere are two different command line parsers available with U-Boot:
34227152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
3423f07771ccSwdenk
3424f07771ccSwdenkOld, simple command line parser:
3425f07771ccSwdenk--------------------------------
3426f07771ccSwdenk
3427f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
3428f07771ccSwdenk- several commands on one line, separated by ';'
3429fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
3430f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
3431f07771ccSwdenk  for example:
3432fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
3433f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
3434f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
3435f07771ccSwdenk
3436f07771ccSwdenkHush shell:
3437f07771ccSwdenk-----------
3438f07771ccSwdenk
3439f07771ccSwdenk- similar to Bourne shell, with control structures like
3440f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
3441f07771ccSwdenk  until...do...done, ...
3442f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
3443f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
3444f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
3445f07771ccSwdenk  command
3446f07771ccSwdenk
3447f07771ccSwdenkGeneral rules:
3448f07771ccSwdenk--------------
3449f07771ccSwdenk
3450f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
3451f07771ccSwdenk    command) contains several commands separated by semicolon, and
3452f07771ccSwdenk    one of these commands fails, then the remaining commands will be
3453f07771ccSwdenk    executed anyway.
3454f07771ccSwdenk
3455f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
345611ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
3457f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
3458f07771ccSwdenk    variables are not executed.
3459f07771ccSwdenk
3460c609719bSwdenkNote for Redundant Ethernet Interfaces:
3461c609719bSwdenk=======================================
3462c609719bSwdenk
346311ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
3464c609719bSwdenksuch configurations and is capable of automatic selection of a
34657152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
3466c609719bSwdenk
3467c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
3468c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3469c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
3470c609719bSwdenk
3471c609719bSwdenkIf the network interface stores some valid MAC address (for instance
3472c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
3473c609719bSwdenkding setting in the environment; if the corresponding environment
3474c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
3475c609719bSwdenk
3476c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
3477c609719bSwdenk  environment, the SROM's address is used.
3478c609719bSwdenk
3479c609719bSwdenko If there is no valid address in the SROM, and a definition in the
3480c609719bSwdenk  environment exists, then the value from the environment variable is
3481c609719bSwdenk  used.
3482c609719bSwdenk
3483c609719bSwdenko If both the SROM and the environment contain a MAC address, and
3484c609719bSwdenk  both addresses are the same, this MAC address is used.
3485c609719bSwdenk
3486c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
3487c609719bSwdenk  addresses differ, the value from the environment is used and a
3488c609719bSwdenk  warning is printed.
3489c609719bSwdenk
3490c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
3491c609719bSwdenk  is raised.
3492c609719bSwdenk
3493ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
3494ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.  This
3495ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
3496ecee9324SBen WarrenThe naming convention is as follows:
3497ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
3498c609719bSwdenk
3499c609719bSwdenkImage Formats:
3500c609719bSwdenk==============
3501c609719bSwdenk
35023310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
35033310c549SMarian Balakowiczimages in two formats:
35043310c549SMarian Balakowicz
35053310c549SMarian BalakowiczNew uImage format (FIT)
35063310c549SMarian Balakowicz-----------------------
35073310c549SMarian Balakowicz
35083310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
35093310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
35103310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
35113310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
35123310c549SMarian Balakowicz
35133310c549SMarian Balakowicz
35143310c549SMarian BalakowiczOld uImage format
35153310c549SMarian Balakowicz-----------------
35163310c549SMarian Balakowicz
35173310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
35183310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
35193310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
3520c609719bSwdenk
3521c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3522c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
3523f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
3524f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
3525f5ed9e39SPeter Tyser  INTEGRITY).
35267b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
35271117cbf2SThomas Chou  IA64, MIPS, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
35281117cbf2SThomas Chou  Currently supported: ARM, AVR32, Intel x86, MIPS, Nios II, PowerPC).
3529c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
3530c609719bSwdenk* Load Address
3531c609719bSwdenk* Entry Point
3532c609719bSwdenk* Image Name
3533c609719bSwdenk* Image Timestamp
3534c609719bSwdenk
3535c609719bSwdenkThe header is marked by a special Magic Number, and both the header
3536c609719bSwdenkand the data portions of the image are secured against corruption by
3537c609719bSwdenkCRC32 checksums.
3538c609719bSwdenk
3539c609719bSwdenk
3540c609719bSwdenkLinux Support:
3541c609719bSwdenk==============
3542c609719bSwdenk
3543c609719bSwdenkAlthough U-Boot should support any OS or standalone application
35447152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
3545c609719bSwdenkU-Boot.
3546c609719bSwdenk
3547c609719bSwdenkU-Boot includes many features that so far have been part of some
3548c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
3549c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
3550c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
35517152b1d0Swdenkserves several purposes:
3552c609719bSwdenk
3553c609719bSwdenk- the same features can be used for other OS or standalone
3554c609719bSwdenk  applications (for instance: using compressed images to reduce the
3555c609719bSwdenk  Flash memory footprint)
3556c609719bSwdenk
3557c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
35587152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
3559c609719bSwdenk
3560c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
3561c609719bSwdenk  images; of course this also means that different kernel images can
3562c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
3563c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
3564c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
3565c609719bSwdenk  software is easier now.
3566c609719bSwdenk
3567c609719bSwdenk
3568c609719bSwdenkLinux HOWTO:
3569c609719bSwdenk============
3570c609719bSwdenk
3571c609719bSwdenkPorting Linux to U-Boot based systems:
3572c609719bSwdenk---------------------------------------
3573c609719bSwdenk
3574c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
3575c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
3576c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
3577c609719bSwdenkLinux :-).
3578c609719bSwdenk
3579a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
3580c609719bSwdenk
3581c609719bSwdenkJust make sure your machine specific header file (for instance
3582c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
35831dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
35841dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
35856d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
3586c609719bSwdenk
3587c609719bSwdenk
3588c609719bSwdenkConfiguring the Linux kernel:
3589c609719bSwdenk-----------------------------
3590c609719bSwdenk
3591c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
3592c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
3593c609719bSwdenk
3594c609719bSwdenk
3595c609719bSwdenkBuilding a Linux Image:
3596c609719bSwdenk-----------------------
3597c609719bSwdenk
359824ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
359924ee89b9Swdenknot used. If you use recent kernel source, a new build target
360024ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
360124ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
360224ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
360324ee89b9Swdenk100% compatible format.
3604c609719bSwdenk
3605c609719bSwdenkExample:
3606c609719bSwdenk
3607c609719bSwdenk	make TQM850L_config
3608c609719bSwdenk	make oldconfig
3609c609719bSwdenk	make dep
361024ee89b9Swdenk	make uImage
3611c609719bSwdenk
361224ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
361324ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
361424ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
3615c609719bSwdenk
361624ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
361724ee89b9Swdenk
361824ee89b9Swdenk* convert the kernel into a raw binary image:
361924ee89b9Swdenk
362024ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
362124ee89b9Swdenk				 -R .note -R .comment \
362224ee89b9Swdenk				 -S vmlinux linux.bin
362324ee89b9Swdenk
362424ee89b9Swdenk* compress the binary image:
362524ee89b9Swdenk
362624ee89b9Swdenk	gzip -9 linux.bin
362724ee89b9Swdenk
362824ee89b9Swdenk* package compressed binary image for U-Boot:
362924ee89b9Swdenk
363024ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
363124ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
363224ee89b9Swdenk		-d linux.bin.gz uImage
363324ee89b9Swdenk
363424ee89b9Swdenk
363524ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
363624ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
363724ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
363824ee89b9Swdenkbyte header containing information about target architecture,
363924ee89b9Swdenkoperating system, image type, compression method, entry points, time
364024ee89b9Swdenkstamp, CRC32 checksums, etc.
364124ee89b9Swdenk
364224ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
364324ee89b9Swdenkprint the header information, or to build new images.
3644c609719bSwdenk
3645c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
3646c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
3647c609719bSwdenkchecksum verification:
3648c609719bSwdenk
3649c609719bSwdenk	tools/mkimage -l image
3650c609719bSwdenk	  -l ==> list image header information
3651c609719bSwdenk
3652c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
3653c609719bSwdenkfrom a "data file" which is used as image payload:
3654c609719bSwdenk
3655c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
3656c609719bSwdenk		      -n name -d data_file image
3657c609719bSwdenk	  -A ==> set architecture to 'arch'
3658c609719bSwdenk	  -O ==> set operating system to 'os'
3659c609719bSwdenk	  -T ==> set image type to 'type'
3660c609719bSwdenk	  -C ==> set compression type 'comp'
3661c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
3662c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
3663c609719bSwdenk	  -n ==> set image name to 'name'
3664c609719bSwdenk	  -d ==> use image data from 'datafile'
3665c609719bSwdenk
366669459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
366769459791Swdenkaddress (0x00000000), but the entry point address depends on the
366869459791Swdenkkernel version:
3669c609719bSwdenk
3670c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
367124ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
3672c609719bSwdenk
3673c609719bSwdenkSo a typical call to build a U-Boot image would read:
3674c609719bSwdenk
367524ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
367624ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
3677a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
367824ee89b9Swdenk	> examples/uImage.TQM850L
367924ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3680c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3681c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3682c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3683c609719bSwdenk	Load Address: 0x00000000
368424ee89b9Swdenk	Entry Point:  0x00000000
3685c609719bSwdenk
3686c609719bSwdenkTo verify the contents of the image (or check for corruption):
3687c609719bSwdenk
368824ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
368924ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3690c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3691c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3692c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3693c609719bSwdenk	Load Address: 0x00000000
369424ee89b9Swdenk	Entry Point:  0x00000000
3695c609719bSwdenk
3696c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
3697c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
3698c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
3699c609719bSwdenkneed to be uncompressed:
3700c609719bSwdenk
3701a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
370224ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
370324ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3704a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
370524ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
370624ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3707c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3708c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
3709c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
3710c609719bSwdenk	Load Address: 0x00000000
371124ee89b9Swdenk	Entry Point:  0x00000000
3712c609719bSwdenk
3713c609719bSwdenk
3714c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
3715c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
3716c609719bSwdenk
3717c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
3718c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
3719c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3720c609719bSwdenk	Image Name:   Simple Ramdisk Image
3721c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
3722c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
3723c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
3724c609719bSwdenk	Load Address: 0x00000000
3725c609719bSwdenk	Entry Point:  0x00000000
3726c609719bSwdenk
3727c609719bSwdenk
3728c609719bSwdenkInstalling a Linux Image:
3729c609719bSwdenk-------------------------
3730c609719bSwdenk
3731c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
3732c609719bSwdenkyou must convert the image to S-Record format:
3733c609719bSwdenk
3734c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
3735c609719bSwdenk
3736c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
3737c609719bSwdenkimage header, so the resulting S-Record file will be relative to
3738c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
3739c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
3740c609719bSwdenkcommand.
3741c609719bSwdenk
3742c609719bSwdenkExample: install the image to address 0x40100000 (which on the
3743c609719bSwdenkTQM8xxL is in the first Flash bank):
3744c609719bSwdenk
3745c609719bSwdenk	=> erase 40100000 401FFFFF
3746c609719bSwdenk
3747c609719bSwdenk	.......... done
3748c609719bSwdenk	Erased 8 sectors
3749c609719bSwdenk
3750c609719bSwdenk	=> loads 40100000
3751c609719bSwdenk	## Ready for S-Record download ...
3752c609719bSwdenk	~>examples/image.srec
3753c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
3754c609719bSwdenk	...
3755c609719bSwdenk	15989 15990 15991 15992
3756c609719bSwdenk	[file transfer complete]
3757c609719bSwdenk	[connected]
3758c609719bSwdenk	## Start Addr = 0x00000000
3759c609719bSwdenk
3760c609719bSwdenk
3761c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
3762c609719bSwdenkthis includes a checksum verification so you can be sure no data
3763c609719bSwdenkcorruption happened:
3764c609719bSwdenk
3765c609719bSwdenk	=> imi 40100000
3766c609719bSwdenk
3767c609719bSwdenk	## Checking Image at 40100000 ...
3768c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3769c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3770c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3771c609719bSwdenk	   Load Address: 00000000
3772c609719bSwdenk	   Entry Point:	 0000000c
3773c609719bSwdenk	   Verifying Checksum ... OK
3774c609719bSwdenk
3775c609719bSwdenk
3776c609719bSwdenkBoot Linux:
3777c609719bSwdenk-----------
3778c609719bSwdenk
3779c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
3780c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
3781c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
3782c609719bSwdenkparameters. You can check and modify this variable using the
3783c609719bSwdenk"printenv" and "setenv" commands:
3784c609719bSwdenk
3785c609719bSwdenk
3786c609719bSwdenk	=> printenv bootargs
3787c609719bSwdenk	bootargs=root=/dev/ram
3788c609719bSwdenk
3789c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3790c609719bSwdenk
3791c609719bSwdenk	=> printenv bootargs
3792c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3793c609719bSwdenk
3794c609719bSwdenk	=> bootm 40020000
3795c609719bSwdenk	## Booting Linux kernel at 40020000 ...
3796c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
3797c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3798c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
3799c609719bSwdenk	   Load Address: 00000000
3800c609719bSwdenk	   Entry Point:	 0000000c
3801c609719bSwdenk	   Verifying Checksum ... OK
3802c609719bSwdenk	   Uncompressing Kernel Image ... OK
3803c609719bSwdenk	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
3804c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
3805c609719bSwdenk	time_init: decrementer frequency = 187500000/60
3806c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
3807c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
3808c609719bSwdenk	...
3809c609719bSwdenk
381011ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
38117152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
3812c609719bSwdenkformat!) to the "bootm" command:
3813c609719bSwdenk
3814c609719bSwdenk	=> imi 40100000 40200000
3815c609719bSwdenk
3816c609719bSwdenk	## Checking Image at 40100000 ...
3817c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3818c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3819c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3820c609719bSwdenk	   Load Address: 00000000
3821c609719bSwdenk	   Entry Point:	 0000000c
3822c609719bSwdenk	   Verifying Checksum ... OK
3823c609719bSwdenk
3824c609719bSwdenk	## Checking Image at 40200000 ...
3825c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
3826c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
3827c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
3828c609719bSwdenk	   Load Address: 00000000
3829c609719bSwdenk	   Entry Point:	 00000000
3830c609719bSwdenk	   Verifying Checksum ... OK
3831c609719bSwdenk
3832c609719bSwdenk	=> bootm 40100000 40200000
3833c609719bSwdenk	## Booting Linux kernel at 40100000 ...
3834c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
3835c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
3836c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
3837c609719bSwdenk	   Load Address: 00000000
3838c609719bSwdenk	   Entry Point:	 0000000c
3839c609719bSwdenk	   Verifying Checksum ... OK
3840c609719bSwdenk	   Uncompressing Kernel Image ... OK
3841c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
3842c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
3843c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
3844c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
3845c609719bSwdenk	   Load Address: 00000000
3846c609719bSwdenk	   Entry Point:	 00000000
3847c609719bSwdenk	   Verifying Checksum ... OK
3848c609719bSwdenk	   Loading Ramdisk ... OK
3849c609719bSwdenk	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
3850c609719bSwdenk	Boot arguments: root=/dev/ram
3851c609719bSwdenk	time_init: decrementer frequency = 187500000/60
3852c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
3853c609719bSwdenk	...
3854c609719bSwdenk	RAMDISK: Compressed image found at block 0
3855c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
3856c609719bSwdenk
3857c609719bSwdenk	bash#
3858c609719bSwdenk
38590267768eSMatthew McClintockBoot Linux and pass a flat device tree:
38600267768eSMatthew McClintock-----------
38610267768eSMatthew McClintock
38620267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
38630267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
38640267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
38650267768eSMatthew McClintockflat device tree:
38660267768eSMatthew McClintock
38670267768eSMatthew McClintock=> print oftaddr
38680267768eSMatthew McClintockoftaddr=0x300000
38690267768eSMatthew McClintock=> print oft
38700267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
38710267768eSMatthew McClintock=> tftp $oftaddr $oft
38720267768eSMatthew McClintockSpeed: 1000, full duplex
38730267768eSMatthew McClintockUsing TSEC0 device
38740267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
38750267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
38760267768eSMatthew McClintockLoad address: 0x300000
38770267768eSMatthew McClintockLoading: #
38780267768eSMatthew McClintockdone
38790267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
38800267768eSMatthew McClintock=> tftp $loadaddr $bootfile
38810267768eSMatthew McClintockSpeed: 1000, full duplex
38820267768eSMatthew McClintockUsing TSEC0 device
38830267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
38840267768eSMatthew McClintockFilename 'uImage'.
38850267768eSMatthew McClintockLoad address: 0x200000
38860267768eSMatthew McClintockLoading:############
38870267768eSMatthew McClintockdone
38880267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
38890267768eSMatthew McClintock=> print loadaddr
38900267768eSMatthew McClintockloadaddr=200000
38910267768eSMatthew McClintock=> print oftaddr
38920267768eSMatthew McClintockoftaddr=0x300000
38930267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
38940267768eSMatthew McClintock## Booting image at 00200000 ...
38950267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
38960267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
38970267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
38980267768eSMatthew McClintock   Load Address: 00000000
38990267768eSMatthew McClintock   Entry Point:	 00000000
39000267768eSMatthew McClintock   Verifying Checksum ... OK
39010267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
39020267768eSMatthew McClintockBooting using flat device tree at 0x300000
39030267768eSMatthew McClintockUsing MPC85xx ADS machine description
39040267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
39050267768eSMatthew McClintock[snip]
39060267768eSMatthew McClintock
39070267768eSMatthew McClintock
39086069ff26SwdenkMore About U-Boot Image Types:
39096069ff26Swdenk------------------------------
39106069ff26Swdenk
39116069ff26SwdenkU-Boot supports the following image types:
39126069ff26Swdenk
39136069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
39146069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
39156069ff26Swdenk	well) you can continue to work in U-Boot after return from
39166069ff26Swdenk	the Standalone Program.
39176069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
39186069ff26Swdenk	will take over control completely. Usually these programs
39196069ff26Swdenk	will install their own set of exception handlers, device
39206069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
39216069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
39226069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
39236069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
39246069ff26Swdenk	being started.
39256069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
39266069ff26Swdenk	(Linux) kernel image and one or more data images like
39276069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
39286069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
39296069ff26Swdenk	server provides just a single image file, but you want to get
39306069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
39316069ff26Swdenk
39326069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
39336069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
39346069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
39356069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
39366069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
39376069ff26Swdenk	a multiple of 4 bytes).
39386069ff26Swdenk
39396069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
39406069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
39416069ff26Swdenk	flash memory.
39426069ff26Swdenk
39436069ff26Swdenk   "Script files" are command sequences that will be executed by
39446069ff26Swdenk	U-Boot's command interpreter; this feature is especially
39456069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
39466069ff26Swdenk	as command interpreter.
39476069ff26Swdenk
3948c609719bSwdenk
3949c609719bSwdenkStandalone HOWTO:
3950c609719bSwdenk=================
3951c609719bSwdenk
3952c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
3953c609719bSwdenkrun "standalone" applications, which can use some resources of
3954c609719bSwdenkU-Boot like console I/O functions or interrupt services.
3955c609719bSwdenk
3956c609719bSwdenkTwo simple examples are included with the sources:
3957c609719bSwdenk
3958c609719bSwdenk"Hello World" Demo:
3959c609719bSwdenk-------------------
3960c609719bSwdenk
3961c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
3962c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
3963c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
3964c609719bSwdenklike that:
3965c609719bSwdenk
3966c609719bSwdenk	=> loads
3967c609719bSwdenk	## Ready for S-Record download ...
3968c609719bSwdenk	~>examples/hello_world.srec
3969c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
3970c609719bSwdenk	[file transfer complete]
3971c609719bSwdenk	[connected]
3972c609719bSwdenk	## Start Addr = 0x00040004
3973c609719bSwdenk
3974c609719bSwdenk	=> go 40004 Hello World! This is a test.
3975c609719bSwdenk	## Starting application at 0x00040004 ...
3976c609719bSwdenk	Hello World
3977c609719bSwdenk	argc = 7
3978c609719bSwdenk	argv[0] = "40004"
3979c609719bSwdenk	argv[1] = "Hello"
3980c609719bSwdenk	argv[2] = "World!"
3981c609719bSwdenk	argv[3] = "This"
3982c609719bSwdenk	argv[4] = "is"
3983c609719bSwdenk	argv[5] = "a"
3984c609719bSwdenk	argv[6] = "test."
3985c609719bSwdenk	argv[7] = "<NULL>"
3986c609719bSwdenk	Hit any key to exit ...
3987c609719bSwdenk
3988c609719bSwdenk	## Application terminated, rc = 0x0
3989c609719bSwdenk
3990c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
3991c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
3992c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
3993c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
3994c609719bSwdenkcharacter, but this is just a demo program. The application can be
3995c609719bSwdenkcontrolled by the following keys:
3996c609719bSwdenk
3997c609719bSwdenk	? - print current values og the CPM Timer registers
3998c609719bSwdenk	b - enable interrupts and start timer
3999c609719bSwdenk	e - stop timer and disable interrupts
4000c609719bSwdenk	q - quit application
4001c609719bSwdenk
4002c609719bSwdenk	=> loads
4003c609719bSwdenk	## Ready for S-Record download ...
4004c609719bSwdenk	~>examples/timer.srec
4005c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4006c609719bSwdenk	[file transfer complete]
4007c609719bSwdenk	[connected]
4008c609719bSwdenk	## Start Addr = 0x00040004
4009c609719bSwdenk
4010c609719bSwdenk	=> go 40004
4011c609719bSwdenk	## Starting application at 0x00040004 ...
4012c609719bSwdenk	TIMERS=0xfff00980
4013c609719bSwdenk	Using timer 1
4014c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
4015c609719bSwdenk
4016c609719bSwdenkHit 'b':
4017c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
4018c609719bSwdenk	Enabling timer
4019c609719bSwdenkHit '?':
4020c609719bSwdenk	[q, b, e, ?] ........
4021c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4022c609719bSwdenkHit '?':
4023c609719bSwdenk	[q, b, e, ?] .
4024c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4025c609719bSwdenkHit '?':
4026c609719bSwdenk	[q, b, e, ?] .
4027c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4028c609719bSwdenkHit '?':
4029c609719bSwdenk	[q, b, e, ?] .
4030c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4031c609719bSwdenkHit 'e':
4032c609719bSwdenk	[q, b, e, ?] ...Stopping timer
4033c609719bSwdenkHit 'q':
4034c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
4035c609719bSwdenk
4036c609719bSwdenk
403785ec0bccSwdenkMinicom warning:
403885ec0bccSwdenk================
403985ec0bccSwdenk
40407152b1d0SwdenkOver time, many people have reported problems when trying to use the
404185ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
404285ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
4043f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
404485ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
404585ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
404685ec0bccSwdenk
404752f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
404852f52c14Swdenkconfiguration to your "File transfer protocols" section:
404952f52c14Swdenk
405052f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
405152f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
405252f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
405352f52c14Swdenk
405452f52c14Swdenk
4055c609719bSwdenkNetBSD Notes:
4056c609719bSwdenk=============
4057c609719bSwdenk
4058c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
4059c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
4060c609719bSwdenk
4061c609719bSwdenkBuilding requires a cross environment; it is known to work on
4062c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4063c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
4064c609719bSwdenkNote that the cross-powerpc package does not install include files;
4065c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
4066c609719bSwdenkmissing.  This file has to be installed and patched manually:
4067c609719bSwdenk
4068c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
4069c609719bSwdenk	# mkdir powerpc
4070c609719bSwdenk	# ln -s powerpc machine
4071c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4072c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
4073c609719bSwdenk
4074c609719bSwdenkNative builds *don't* work due to incompatibilities between native
4075c609719bSwdenkand U-Boot include files.
4076c609719bSwdenk
4077c609719bSwdenkBooting assumes that (the first part of) the image booted is a
4078c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
4079c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
4080c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
40812a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
4082c609719bSwdenk
4083c609719bSwdenk
4084c609719bSwdenkImplementation Internals:
4085c609719bSwdenk=========================
4086c609719bSwdenk
4087c609719bSwdenkThe following is not intended to be a complete description of every
4088c609719bSwdenkimplementation detail. However, it should help to understand the
4089c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
4090c609719bSwdenkhardware.
4091c609719bSwdenk
4092c609719bSwdenk
4093c609719bSwdenkInitial Stack, Global Data:
4094c609719bSwdenk---------------------------
4095c609719bSwdenk
4096c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
4097c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
4098c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
4099c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
4100c609719bSwdenkis not initialized as zero. To be able to get a C environment working
4101c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
4102c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
4103c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
4104c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
4105c609719bSwdenklocked as (mis-) used as memory, etc.
4106c609719bSwdenk
41077152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
41080668236bSWolfgang Denk	U-Boot mailing list:
410943d9616cSwdenk
411043d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
411143d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
411243d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
411343d9616cSwdenk	...
411443d9616cSwdenk
411543d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
411643d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
411743d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
411843d9616cSwdenk	is that the cache is being used as a temporary supply of
411943d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
412011ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
412143d9616cSwdenk	can see how this works by studying the cache architecture and
412243d9616cSwdenk	operation in the architecture and processor-specific manuals.
412343d9616cSwdenk
412443d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
412543d9616cSwdenk	is another option for the system designer to use as an
412611ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
412743d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
412843d9616cSwdenk	board designers haven't used it for something that would
412943d9616cSwdenk	cause you grief during the initial boot! It is frequently not
413043d9616cSwdenk	used.
413143d9616cSwdenk
41326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
413343d9616cSwdenk	with your processor/board/system design. The default value
413443d9616cSwdenk	you will find in any recent u-boot distribution in
41358a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
413643d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
413743d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
413843d9616cSwdenk	that are supposed to respond to that address! That code in
413943d9616cSwdenk	start.S has been around a while and should work as is when
414043d9616cSwdenk	you get the config right.
414143d9616cSwdenk
414243d9616cSwdenk	-Chris Hallinan
414343d9616cSwdenk	DS4.COM, Inc.
414443d9616cSwdenk
4145c609719bSwdenkIt is essential to remember this, since it has some impact on the C
4146c609719bSwdenkcode for the initialization procedures:
4147c609719bSwdenk
4148c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
4149c609719bSwdenk  to write it.
4150c609719bSwdenk
415111ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
4152c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
41537152b1d0Swdenk  zation is performed later (when relocating to RAM).
4154c609719bSwdenk
4155c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
4156c609719bSwdenk  that.
4157c609719bSwdenk
4158c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
4159c609719bSwdenknormal global data to share information beween the code. But it
4160c609719bSwdenkturned out that the implementation of U-Boot can be greatly
4161c609719bSwdenksimplified by making a global data structure (gd_t) available to all
4162c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
4163c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
4164c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
4165c609719bSwdenkplace a pointer (gd) to the global data into a register which we
4166c609719bSwdenkreserve for this purpose.
4167c609719bSwdenk
41687152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
4169c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
4170c609719bSwdenkGCC's implementation.
4171c609719bSwdenk
4172c609719bSwdenkFor PowerPC, the following registers have specific use:
4173c609719bSwdenk	R1:	stack pointer
4174e7670f6cSWolfgang Denk	R2:	reserved for system use
4175c609719bSwdenk	R3-R4:	parameter passing and return values
4176c609719bSwdenk	R5-R10: parameter passing
4177c609719bSwdenk	R13:	small data area pointer
4178c609719bSwdenk	R30:	GOT pointer
4179c609719bSwdenk	R31:	frame pointer
4180c609719bSwdenk
4181e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
4182e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
4183e6bee808SJoakim Tjernlund	going back and forth between asm and C)
4184c609719bSwdenk
4185e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
4186c609719bSwdenk
4187c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
4188c609719bSwdenk    address of the global data structure is known at compile time),
4189c609719bSwdenk    but it turned out that reserving a register results in somewhat
4190c609719bSwdenk    smaller code - although the code savings are not that big (on
4191c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
4192c609719bSwdenk    624 text + 127 data).
4193c609719bSwdenk
4194c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
41954c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
41964c58eb55SMike Frysinger
4197c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
41984c58eb55SMike Frysinger
4199c609719bSwdenkOn ARM, the following registers are used:
4200c609719bSwdenk
4201c609719bSwdenk	R0:	function argument word/integer result
4202c609719bSwdenk	R1-R3:	function argument word
4203c609719bSwdenk	R9:	GOT pointer
4204c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
4205c609719bSwdenk	R11:	argument (frame) pointer
4206c609719bSwdenk	R12:	temporary workspace
4207c609719bSwdenk	R13:	stack pointer
4208c609719bSwdenk	R14:	link register
4209c609719bSwdenk	R15:	program counter
4210c609719bSwdenk
4211c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
4212c609719bSwdenk
42130df01fd3SThomas ChouOn Nios II, the ABI is documented here:
42140df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
42150df01fd3SThomas Chou
42160df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
42170df01fd3SThomas Chou
42180df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
42190df01fd3SThomas Chou    to access small data sections, so gp is free.
42200df01fd3SThomas Chou
4221d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
4222d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
4223c609719bSwdenk
4224c609719bSwdenkMemory Management:
4225c609719bSwdenk------------------
4226c609719bSwdenk
4227c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
4228c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
4229c609719bSwdenk
4230c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
4231c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
4232c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
4233c609719bSwdenkphysical memory banks.
4234c609719bSwdenk
4235c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
4236c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
4237c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
4238c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
42396d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
4240c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
4241c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
4242c609719bSwdenk
4243c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
4244c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
4245c609719bSwdenk
4246c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
4247c609719bSwdenkthis:
4248c609719bSwdenk
4249c609719bSwdenk	0x0000 0000	Exception Vector code
4250c609719bSwdenk	      :
4251c609719bSwdenk	0x0000 1FFF
4252c609719bSwdenk	0x0000 2000	Free for Application Use
4253c609719bSwdenk	      :
4254c609719bSwdenk	      :
4255c609719bSwdenk
4256c609719bSwdenk	      :
4257c609719bSwdenk	      :
4258c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
4259c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
4260c609719bSwdenk	0x00FC 0000	Malloc Arena
4261c609719bSwdenk	      :
4262c609719bSwdenk	0x00FD FFFF
4263c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
4264c609719bSwdenk	...		eventually: LCD or video framebuffer
4265c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
4266c609719bSwdenk	0x00FF FFFF	[End of RAM]
4267c609719bSwdenk
4268c609719bSwdenk
4269c609719bSwdenkSystem Initialization:
4270c609719bSwdenk----------------------
4271c609719bSwdenk
4272c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
427311ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
4274c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
42757152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
4276c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
4277c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
4278c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
4279c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
4280c609719bSwdenkthe caches and the SIU.
4281c609719bSwdenk
4282c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
4283c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
4284c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
4285c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
4286c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
4287c609719bSwdenksimple memory test is run that determines the size of the SDRAM
4288c609719bSwdenkbanks.
4289c609719bSwdenk
4290c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
42917152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
4292c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
4293c609719bSwdenk0x00000000, with any additional banks following immediately to create
4294c609719bSwdenkcontiguous memory starting from 0.
4295c609719bSwdenk
4296c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
4297c609719bSwdenkand allocates memory for use by malloc() and for the global Board
4298c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
4299c609719bSwdenkpages, and the final stack is set up.
4300c609719bSwdenk
4301c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
4302c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
4303c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
4304c609719bSwdenknew address in RAM.
4305c609719bSwdenk
4306c609719bSwdenk
4307c609719bSwdenkU-Boot Porting Guide:
4308c609719bSwdenk----------------------
4309c609719bSwdenk
4310c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
43116aff3115Swdenklist, October 2002]
4312c609719bSwdenk
4313c609719bSwdenk
4314c609719bSwdenkint main(int argc, char *argv[])
4315c609719bSwdenk{
4316c609719bSwdenk	sighandler_t no_more_time;
4317c609719bSwdenk
4318c609719bSwdenk	signal(SIGALRM, no_more_time);
4319c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
4320c609719bSwdenk
4321c609719bSwdenk	if (available_money > available_manpower) {
43226c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
4323c609719bSwdenk		return 0;
4324c609719bSwdenk	}
4325c609719bSwdenk
4326c609719bSwdenk	Download latest U-Boot source;
4327c609719bSwdenk
43280668236bSWolfgang Denk	Subscribe to u-boot mailing list;
43296aff3115Swdenk
43306c3fef28SJerry Van Baren	if (clueless)
4331c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
4332c609719bSwdenk
4333c609719bSwdenk	while (learning) {
4334c609719bSwdenk		Read the README file in the top level directory;
43357cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
43366c3fef28SJerry Van Baren		Read applicable doc/*.README;
4337c609719bSwdenk		Read the source, Luke;
43386c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
4339c609719bSwdenk	}
4340c609719bSwdenk
43416c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
43426c3fef28SJerry Van Baren		Buy a BDI3000;
43436c3fef28SJerry Van Baren	else
4344c609719bSwdenk		Add a lot of aggravation and time;
4345c609719bSwdenk
43466c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
43476c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
43486c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
43496c3fef28SJerry Van Baren	} else {
4350c609719bSwdenk		Create your own board support subdirectory;
43516c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
43526c3fef28SJerry Van Baren	}
43536c3fef28SJerry Van Baren	Edit new board/<myboard> files
43546c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
4355c609719bSwdenk
43566c3fef28SJerry Van Baren	while (!accepted) {
4357c609719bSwdenk		while (!running) {
4358c609719bSwdenk			do {
4359c609719bSwdenk				Add / modify source code;
4360c609719bSwdenk			} until (compiles);
4361c609719bSwdenk			Debug;
4362c609719bSwdenk			if (clueless)
4363c609719bSwdenk				email("Hi, I am having problems...");
4364c609719bSwdenk		}
43656c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
43666c3fef28SJerry Van Baren		if (reasonable critiques)
43676c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
43686c3fef28SJerry Van Baren		else
43696c3fef28SJerry Van Baren			Defend code as written;
43706c3fef28SJerry Van Baren	}
4371c609719bSwdenk
4372c609719bSwdenk	return 0;
4373c609719bSwdenk}
4374c609719bSwdenk
4375c609719bSwdenkvoid no_more_time (int sig)
4376c609719bSwdenk{
4377c609719bSwdenk      hire_a_guru();
4378c609719bSwdenk}
4379c609719bSwdenk
4380c609719bSwdenk
4381c609719bSwdenkCoding Standards:
4382c609719bSwdenk-----------------
4383c609719bSwdenk
4384c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
43852c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
43862c051651SDetlev Zundel"scripts/Lindent" in your Linux kernel source directory.  In sources
43872c051651SDetlev Zundeloriginating from U-Boot a style corresponding to "Lindent -pcs" (adding
43882c051651SDetlev Zundelspaces before parameters to function calls) is actually used.
4389c609719bSwdenk
43902c051651SDetlev ZundelSource files originating from a different project (for example the
43912c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
43922c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
43932c051651SDetlev Zundelsources.
43942c051651SDetlev Zundel
43952c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
43962c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
43972c051651SDetlev Zundelin your code.
4398c609719bSwdenk
4399c178d3daSwdenkPlease also stick to the following formatting rules:
4400180d3f74Swdenk- remove any trailing white space
4401180d3f74Swdenk- use TAB characters for indentation, not spaces
4402180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
4403180d3f74Swdenk- do not add more than 2 empty lines to source files
4404180d3f74Swdenk- do not add trailing empty lines to source files
4405180d3f74Swdenk
4406c609719bSwdenkSubmissions which do not conform to the standards may be returned
4407c609719bSwdenkwith a request to reformat the changes.
4408c609719bSwdenk
4409c609719bSwdenk
4410c609719bSwdenkSubmitting Patches:
4411c609719bSwdenk-------------------
4412c609719bSwdenk
4413c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
4414c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
4415c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
4416c609719bSwdenk
44170d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
4418218ca724SWolfgang Denk
44190668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
44200668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
44210668236bSWolfgang Denk
4422c609719bSwdenkWhen you send a patch, please include the following information with
4423c609719bSwdenkit:
4424c609719bSwdenk
4425c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
4426c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
4427c609719bSwdenk  patch actually fixes something.
4428c609719bSwdenk
4429c609719bSwdenk* For new features: a description of the feature and your
4430c609719bSwdenk  implementation.
4431c609719bSwdenk
4432c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
4433c609719bSwdenk
4434c609719bSwdenk* For major contributions, your entry to the CREDITS file
4435c609719bSwdenk
4436c609719bSwdenk* When you add support for a new board, don't forget to add this
4437c609719bSwdenk  board to the MAKEALL script, too.
4438c609719bSwdenk
4439c609719bSwdenk* If your patch adds new configuration options, don't forget to
4440c609719bSwdenk  document these in the README file.
4441c609719bSwdenk
4442218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
4443218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
4444218ca724SWolfgang Denk  "git-format-patch". If you then use "git-send-email" to send it to
4445218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
4446218ca724SWolfgang Denk  with some other mail clients.
4447c609719bSwdenk
4448218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
4449218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
4450218ca724SWolfgang Denk  GNU diff.
44516dff5529Swdenk
4452218ca724SWolfgang Denk  The current directory when running this command shall be the parent
4453218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
4454218ca724SWolfgang Denk  your patch includes sufficient directory information for the
4455218ca724SWolfgang Denk  affected files).
4456218ca724SWolfgang Denk
4457218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
4458218ca724SWolfgang Denk  and compressed attachments must not be used.
4459c609719bSwdenk
446052f52c14Swdenk* If one logical set of modifications affects or creates several
446152f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
446252f52c14Swdenk
446352f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
446452f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
446552f52c14Swdenk
446652f52c14Swdenk
4467c609719bSwdenkNotes:
4468c609719bSwdenk
4469c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
4470c609719bSwdenk  source tree and make sure that no errors or warnings are reported
4471c609719bSwdenk  for any of the boards.
4472c609719bSwdenk
4473c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
4474c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
4475c609719bSwdenk  returned with a request to re-formatting / split it.
4476c609719bSwdenk
4477c609719bSwdenk* If you modify existing code, make sure that your new code does not
4478c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
4479c609719bSwdenk  When adding new features, these should compile conditionally only
4480c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
4481c609719bSwdenk  disabled must not need more memory than the old code without your
4482c609719bSwdenk  modification.
448390dc6704Swdenk
44840668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
44850668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
44860668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
44870668236bSWolfgang Denk  bigger than the size limit should be avoided.
4488