xref: /openbmc/u-boot/README (revision 9660e442de66e7a80513b30e5226eeec73b9c17a)
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
1506eb0921aSAndreas Bießmann	/at91		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
18392bbd64eSDaniel Schwierzeck      /mips32		Files specific to MIPS32 CPUs
18480421fccSXiangfu Liu      /xburst		Files specific to Ingenic XBurst CPUs
1858d321b81SPeter Tyser    /lib		Architecture specific library files
186afc1ce82SMacpaul Lin  /nds32		Files generic to NDS32 architecture
187afc1ce82SMacpaul Lin    /cpu		CPU specific files
188afc1ce82SMacpaul Lin      /n1213		Files specific to Andes Technology N1213 CPUs
189afc1ce82SMacpaul Lin    /lib		Architecture specific library files
1908d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1918d321b81SPeter Tyser    /cpu		CPU specific files
1928d321b81SPeter Tyser    /lib		Architecture specific library files
193a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1948d321b81SPeter Tyser    /cpu		CPU specific files
1958d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
1968d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
1978d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
1988d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
1998d321b81SPeter Tyser      /mpc8220		Files specific to Freescale MPC8220 CPUs
2008d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
2018d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
2028d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
2038d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
2048d321b81SPeter Tyser    /lib		Architecture specific library files
2058d321b81SPeter Tyser  /sh			Files generic to SH architecture
2068d321b81SPeter Tyser    /cpu		CPU specific files
2078d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
2088d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
2098d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
2108d321b81SPeter Tyser    /lib		Architecture specific library files
2118d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
2128d321b81SPeter Tyser    /cpu		CPU specific files
2138d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2148d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2158d321b81SPeter Tyser    /lib		Architecture specific library files
2168d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2178d321b81SPeter Tyser/board			Board dependent files
2188d321b81SPeter Tyser/common			Misc architecture independent functions
2198d321b81SPeter Tyser/disk			Code for disk drive partition handling
2208d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2218d321b81SPeter Tyser/drivers		Commonly used device drivers
2228d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2238d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2248d321b81SPeter Tyser/include		Header Files
2258d321b81SPeter Tyser/lib			Files generic to all architectures
2268d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2278d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2288d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2298d321b81SPeter Tyser/net			Networking code
2308d321b81SPeter Tyser/post			Power On Self Test
2318d321b81SPeter Tyser/rtc			Real Time Clock drivers
2328d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
233c609719bSwdenk
234c609719bSwdenkSoftware Configuration:
235c609719bSwdenk=======================
236c609719bSwdenk
237c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
238c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
239c609719bSwdenk
240c609719bSwdenkThere are two classes of configuration variables:
241c609719bSwdenk
242c609719bSwdenk* Configuration _OPTIONS_:
243c609719bSwdenk  These are selectable by the user and have names beginning with
244c609719bSwdenk  "CONFIG_".
245c609719bSwdenk
246c609719bSwdenk* Configuration _SETTINGS_:
247c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
248c609719bSwdenk  you don't know what you're doing; they have names beginning with
2496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
250c609719bSwdenk
251c609719bSwdenkLater we will add a configuration tool - probably similar to or even
252c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
253c609719bSwdenkdo the configuration by hand, which means creating some symbolic
254c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
255c609719bSwdenkas an example here.
256c609719bSwdenk
257c609719bSwdenk
258c609719bSwdenkSelection of Processor Architecture and Board Type:
259c609719bSwdenk---------------------------------------------------
260c609719bSwdenk
261c609719bSwdenkFor all supported boards there are ready-to-use default
262c609719bSwdenkconfigurations available; just type "make <board_name>_config".
263c609719bSwdenk
264c609719bSwdenkExample: For a TQM823L module type:
265c609719bSwdenk
266c609719bSwdenk	cd u-boot
267c609719bSwdenk	make TQM823L_config
268c609719bSwdenk
26911ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
270c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
271c609719bSwdenkdirectory according to the instructions in cogent/README.
272c609719bSwdenk
273c609719bSwdenk
274c609719bSwdenkConfiguration Options:
275c609719bSwdenk----------------------
276c609719bSwdenk
277c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
278c609719bSwdenksuch information is kept in a configuration file
279c609719bSwdenk"include/configs/<board_name>.h".
280c609719bSwdenk
281c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
282c609719bSwdenk"include/configs/TQM823L.h".
283c609719bSwdenk
284c609719bSwdenk
2857f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2867f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2877f6c2cbcSwdenkbuild a config tool - later.
2887f6c2cbcSwdenk
2897f6c2cbcSwdenk
290c609719bSwdenkThe following options need to be configured:
291c609719bSwdenk
2922628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
293c609719bSwdenk
2942628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2956ccec449SWolfgang Denk
2966ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
29709ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
298c609719bSwdenk
299c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
300c609719bSwdenk		Define exactly one of
301c609719bSwdenk		CONFIG_CMA286_60_OLD
302c609719bSwdenk--- FIXME --- not tested yet:
303c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
304c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
305c609719bSwdenk
306c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
307c609719bSwdenk		Define exactly one of
308c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
309c609719bSwdenk
310c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
311c609719bSwdenk		Define one or more of
312c609719bSwdenk		CONFIG_CMA302
313c609719bSwdenk
314c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
315c609719bSwdenk		Define one or more of
316c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
31711ccc33fSMarcel Ziswiler					  the LCD display every second with
318c609719bSwdenk					  a "rotator" |\-/|\-/
319c609719bSwdenk
3202535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3212535d602Swdenk		CONFIG_ADSTYPE
3222535d602Swdenk		Possible values are:
3236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3272535d602Swdenk
328cf946c6dSLei Wen- Marvell Family Member
329cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
330cf946c6dSLei Wen					  multiple fs option at one time
331cf946c6dSLei Wen					  for marvell soc family
332cf946c6dSLei Wen
333c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
334c609719bSwdenk		Define exactly one of
335c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
336c609719bSwdenk
33711ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
33866ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
33966ca92a5Swdenk					  get_gclk_freq() cannot work
3405da627a4Swdenk					  e.g. if there is no 32KHz
3415da627a4Swdenk					  reference PIT/RTC clock
34266ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
34366ca92a5Swdenk					  or XTAL/EXTAL)
344c609719bSwdenk
34566ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
34866ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
34975d1ea7fSwdenk			See doc/README.MPC866
35075d1ea7fSwdenk
3516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
35275d1ea7fSwdenk
35375d1ea7fSwdenk		Define this to measure the actual CPU clock instead
35475d1ea7fSwdenk		of relying on the correctness of the configured
35575d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
35675d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
35775d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
35975d1ea7fSwdenk
360506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
361506f3918SHeiko Schocher
362506f3918SHeiko Schocher		Define this option if you want to enable the
363506f3918SHeiko Schocher		ICache only when Code runs from RAM.
364506f3918SHeiko Schocher
36566412c63SKumar Gala- 85xx CPU Options:
36666412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
36766412c63SKumar Gala
36866412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
36966412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
37066412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
37166412c63SKumar Gala
3728f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3738f29084aSKumar Gala
3748f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3758f29084aSKumar Gala		tree nodes for the given platform.
3768f29084aSKumar Gala
3770b953ffcSMarkus Klotzbuecher- Intel Monahans options:
3786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
3790b953ffcSMarkus Klotzbuecher
3800b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
3810b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
3820b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
3830b953ffcSMarkus Klotzbuecher
3846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
3850b953ffcSMarkus Klotzbuecher
3860b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
3870b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
3880b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
3890b953ffcSMarkus Klotzbuecher		by this value.
3900b953ffcSMarkus Klotzbuecher
39192bbd64eSDaniel Schwierzeck- MIPS CPU options:
39292bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
39392bbd64eSDaniel Schwierzeck
39492bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
39592bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
39692bbd64eSDaniel Schwierzeck		relocation.
39792bbd64eSDaniel Schwierzeck
39892bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
39992bbd64eSDaniel Schwierzeck
40092bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
40192bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
40292bbd64eSDaniel Schwierzeck		Possible values are:
40392bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
40492bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
40592bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
40692bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
40792bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
40892bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
40992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
41092bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
41192bbd64eSDaniel Schwierzeck
41292bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
41392bbd64eSDaniel Schwierzeck
41492bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
41592bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
41692bbd64eSDaniel Schwierzeck
41792bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
41892bbd64eSDaniel Schwierzeck
41992bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
42092bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
42192bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
42292bbd64eSDaniel Schwierzeck
4235da627a4Swdenk- Linux Kernel Interface:
424c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
425c609719bSwdenk
426c609719bSwdenk		U-Boot stores all clock information in Hz
427c609719bSwdenk		internally. For binary compatibility with older Linux
428c609719bSwdenk		kernels (which expect the clocks passed in the
429c609719bSwdenk		bd_info data to be in MHz) the environment variable
430c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
431c609719bSwdenk		converts clock data to MHZ before passing it to the
432c609719bSwdenk		Linux kernel.
433c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
434c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
435c609719bSwdenk		default environment.
436c609719bSwdenk
4375da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
4385da627a4Swdenk
43911ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
4405da627a4Swdenk		expect it to be in bytes, others in MB.
4415da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
4425da627a4Swdenk
443fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
444f57f70aaSWolfgang Denk
445f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
446213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
447213bf8c8SGerald Van Baren		concepts).
448213bf8c8SGerald Van Baren
449213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
450213bf8c8SGerald Van Baren		 * New libfdt-based support
451213bf8c8SGerald Van Baren		 * Adds the "fdt" command
4523bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
453213bf8c8SGerald Van Baren
454b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
455b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
456b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
457b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
458f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
459c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
460f57f70aaSWolfgang Denk
46111ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
46211ccc33fSMarcel Ziswiler		addresses
4633bb342fcSKim Phillips
4644e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
4654e253137SKumar Gala
4664e253137SKumar Gala		Board code has addition modification that it wants to make
4674e253137SKumar Gala		to the flat device tree before handing it off to the kernel
4686705d81eSwdenk
4690267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
4700267768eSMatthew McClintock
47111ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
4720267768eSMatthew McClintock		param header, the default value is zero if undefined.
4730267768eSMatthew McClintock
4743887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
4753887c3fbSHeiko Schocher
4763887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
4773887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
4783887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
4793887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
4803887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
4813887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
4823887c3fbSHeiko Schocher
4837eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
4847eb29398SIgor Grinberg
4857eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
4867eb29398SIgor Grinberg		machine type and must be used to specify the machine type
4877eb29398SIgor Grinberg		number as it appears in the ARM machine registry
4887eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
4897eb29398SIgor Grinberg		Only boards that have multiple machine types supported
4907eb29398SIgor Grinberg		in a single configuration file and the machine type is
4917eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
4927eb29398SIgor Grinberg
4930b2f4ecaSNiklaus Giger- vxWorks boot parameters:
4940b2f4ecaSNiklaus Giger
4950b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
4960b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
4970b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
4980b2f4ecaSNiklaus Giger
4990b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5000b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5010b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5020b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5030b2f4ecaSNiklaus Giger
5040b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5050b2f4ecaSNiklaus Giger
5060b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
5070b2f4ecaSNiklaus Giger
5080b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
5090b2f4ecaSNiklaus Giger		the defaults discussed just above.
5100b2f4ecaSNiklaus Giger
5112c451f78SAneesh V- Cache Configuration:
5122c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
5132c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
5142c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
5152c451f78SAneesh V
51693bc2193SAneesh V- Cache Configuration for ARM:
51793bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
51893bc2193SAneesh V				      controller
51993bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
52093bc2193SAneesh V					controller register space
52193bc2193SAneesh V
5226705d81eSwdenk- Serial Ports:
52348d0192fSAndreas Engel		CONFIG_PL010_SERIAL
5246705d81eSwdenk
5256705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
5266705d81eSwdenk
52748d0192fSAndreas Engel		CONFIG_PL011_SERIAL
5286705d81eSwdenk
5296705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
5306705d81eSwdenk
5316705d81eSwdenk		CONFIG_PL011_CLOCK
5326705d81eSwdenk
5336705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
5346705d81eSwdenk		the clock speed of the UARTs.
5356705d81eSwdenk
5366705d81eSwdenk		CONFIG_PL01x_PORTS
5376705d81eSwdenk
5386705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
5396705d81eSwdenk		define this to a list of base addresses for each (supported)
5406705d81eSwdenk		port. See e.g. include/configs/versatile.h
5416705d81eSwdenk
542910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
543910f1ae3SJohn Rigby
544910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
545910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
546910f1ae3SJohn Rigby		this variable to initialize the extra register.
547910f1ae3SJohn Rigby
548910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
549910f1ae3SJohn Rigby
550910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
551910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
552910f1ae3SJohn Rigby		variable to flush the UART at init time.
553910f1ae3SJohn Rigby
5546705d81eSwdenk
555c609719bSwdenk- Console Interface:
556c609719bSwdenk		Depending on board, define exactly one serial port
557c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
558c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
559c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
560c609719bSwdenk
561c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
562c609719bSwdenk		port routines must be defined elsewhere
563c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
564c609719bSwdenk
565c609719bSwdenk		CONFIG_CFB_CONSOLE
566c609719bSwdenk		Enables console device for a color framebuffer. Needs following
567c609719bSwdenk		defines (cf. smiLynxEM, i8042, board/eltec/bab7xx)
568c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
569c609719bSwdenk						(default big endian)
570c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
571c609719bSwdenk						rectangle fill
572c609719bSwdenk						(cf. smiLynxEM)
573c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
574c609719bSwdenk						bit-blit (cf. smiLynxEM)
575c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
576c609719bSwdenk						(cols=pitch)
577c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
578c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
579c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
580c609719bSwdenk						(0-5, cf. cfb_console.c)
581c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
582c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
583c609719bSwdenk						(i.e. i8042_kbd_init())
584c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
585c609719bSwdenk						(i.e. i8042_tstc)
586c609719bSwdenk			VIDEO_GETC_FCT		get char fct
587c609719bSwdenk						(i.e. i8042_getc)
588c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
589c609719bSwdenk						(requires blink timer
590c609719bSwdenk						cf. i8042.c)
5916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
592c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
593c609719bSwdenk						upper right corner
594602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
595c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
596c609719bSwdenk						upper left corner
597a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
598a6c7ad2fSwdenk						linux_logo.h for logo.
599a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
600c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
60111ccc33fSMarcel Ziswiler						additional board info beside
602c609719bSwdenk						the logo
603c609719bSwdenk
604c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
605c609719bSwdenk		default i/o. Serial console can be forced with
606c609719bSwdenk		environment 'console=serial'.
607c609719bSwdenk
608a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
609a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
610a3ad8e26Swdenk		the "silent" environment variable. See
611a3ad8e26Swdenk		doc/README.silent for more information.
612a3ad8e26Swdenk
613c609719bSwdenk- Console Baudrate:
614c609719bSwdenk		CONFIG_BAUDRATE - in bps
615c609719bSwdenk		Select one of the baudrates listed in
6166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
6176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
618c609719bSwdenk
619c92fac91SHeiko Schocher- Console Rx buffer length
620c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
621c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
6222b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
623c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
624c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
625c92fac91SHeiko Schocher		the SMC.
626c92fac91SHeiko Schocher
6279558b48aSGraeme Russ- Pre-Console Buffer:
6289558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
6299558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
6309558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
6319558b48aSGraeme Russ		buffer any console messages prior to the console being
6329558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
6339558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
6349558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
6359558b48aSGraeme Russ		bytes are output before the console is initialised, the
6369558b48aSGraeme Russ		earlier bytes are discarded.
6379558b48aSGraeme Russ
6389558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
6399558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
6409558b48aSGraeme Russ
641c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
642c609719bSwdenk		Delay before automatically booting the default image;
643c609719bSwdenk		set to -1 to disable autoboot.
644c609719bSwdenk
645c609719bSwdenk		See doc/README.autoboot for these options that
646c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
647c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
648c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
649c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
650c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
651c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
652c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
653c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
654c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
655c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
656c609719bSwdenk		CONFIG_RESET_TO_RETRY
657c609719bSwdenk
658c609719bSwdenk- Autoboot Command:
659c609719bSwdenk		CONFIG_BOOTCOMMAND
660c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
661c609719bSwdenk		define a command string that is automatically executed
662c609719bSwdenk		when no character is read on the console interface
663c609719bSwdenk		within "Boot Delay" after reset.
664c609719bSwdenk
665c609719bSwdenk		CONFIG_BOOTARGS
666c609719bSwdenk		This can be used to pass arguments to the bootm
667c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
668c609719bSwdenk		environment value "bootargs".
669c609719bSwdenk
670c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
671c609719bSwdenk		The value of these goes into the environment as
672c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
673c609719bSwdenk		as a convenience, when switching between booting from
67411ccc33fSMarcel Ziswiler		RAM and NFS.
675c609719bSwdenk
676c609719bSwdenk- Pre-Boot Commands:
677c609719bSwdenk		CONFIG_PREBOOT
678c609719bSwdenk
679c609719bSwdenk		When this option is #defined, the existence of the
680c609719bSwdenk		environment variable "preboot" will be checked
681c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
682c609719bSwdenk		countdown and/or running the auto-boot command resp.
683c609719bSwdenk		entering interactive mode.
684c609719bSwdenk
685c609719bSwdenk		This feature is especially useful when "preboot" is
686c609719bSwdenk		automatically generated or modified. For an example
687c609719bSwdenk		see the LWMON board specific code: here "preboot" is
688c609719bSwdenk		modified when the user holds down a certain
689c609719bSwdenk		combination of keys on the (special) keyboard when
690c609719bSwdenk		booting the systems
691c609719bSwdenk
692c609719bSwdenk- Serial Download Echo Mode:
693c609719bSwdenk		CONFIG_LOADS_ECHO
694c609719bSwdenk		If defined to 1, all characters received during a
695c609719bSwdenk		serial download (using the "loads" command) are
696c609719bSwdenk		echoed back. This might be needed by some terminal
697c609719bSwdenk		emulations (like "cu"), but may as well just take
698c609719bSwdenk		time on others. This setting #define's the initial
699c609719bSwdenk		value of the "loads_echo" environment variable.
700c609719bSwdenk
701602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
702c609719bSwdenk		CONFIG_KGDB_BAUDRATE
703c609719bSwdenk		Select one of the baudrates listed in
7046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
705c609719bSwdenk
706c609719bSwdenk- Monitor Functions:
707602ad3b3SJon Loeliger		Monitor commands can be included or excluded
708602ad3b3SJon Loeliger		from the build by using the #include files
709602ad3b3SJon Loeliger		"config_cmd_all.h" and #undef'ing unwanted
710602ad3b3SJon Loeliger		commands, or using "config_cmd_default.h"
711602ad3b3SJon Loeliger		and augmenting with additional #define's
712602ad3b3SJon Loeliger		for wanted commands.
713c609719bSwdenk
714602ad3b3SJon Loeliger		The default command configuration includes all commands
715602ad3b3SJon Loeliger		except those marked below with a "*".
716602ad3b3SJon Loeliger
717602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
718602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
719602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
720602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
721602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
722602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
723602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
724602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
725710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
726602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
727602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
728602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
729a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
730a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
731a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
732a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
733602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
734602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
735246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
736602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
737602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
7380c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
739bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
740602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
741602ad3b3SJon Loeliger		CONFIG_CMD_FAT		* FAT partition support
742602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
743602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
744602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
745a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
746a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
747602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
748602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
749602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
750602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
751602ad3b3SJon Loeliger		CONFIG_CMD_IMLS		  List all found images
752602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
7530c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
754602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
755602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
756602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
757602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
7581ba7fd25SMike Frysinger		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
759602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
760602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
76102c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
76202c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
763602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
76456523f12Swdenk					  loop, loopw, mtest
765602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
766602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
767602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
76868d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
769602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
770602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
771e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
772e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
773602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
774602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
775602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
776602ad3b3SJon Loeliger					  host
777602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
778602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
779602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
780602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
781602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
782602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
783602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
784602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
785602ad3b3SJon Loeliger					  (4xx only)
786c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
78702c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
78874de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
789602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
7907a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
7911fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
792ca366d0eSChe-liang Chiou		CONFIG_CMD_TIME		* run command and report execution time
793602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
794602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
795602ad3b3SJon Loeliger		CONFIG_CMD_FSL		* Microblaze FSL support
796c609719bSwdenk
797c609719bSwdenk
798c609719bSwdenk		EXAMPLE: If you want all functions except of network
799c609719bSwdenk		support you can write:
800c609719bSwdenk
801602ad3b3SJon Loeliger		#include "config_cmd_all.h"
802602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
803c609719bSwdenk
804213bf8c8SGerald Van Baren	Other Commands:
805213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
806c609719bSwdenk
807c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
808602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
809c609719bSwdenk		what you (and your U-Boot users) are doing. Data
810c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
811c609719bSwdenk		8260 (where accesses to the IMMR region must be
812c609719bSwdenk		uncached), and it cannot be disabled on all other
813c609719bSwdenk		systems where we (mis-) use the data cache to hold an
814c609719bSwdenk		initial stack and some data.
815c609719bSwdenk
816c609719bSwdenk
817c609719bSwdenk		XXX - this list needs to get updated!
818c609719bSwdenk
81945ba8077SSimon Glass- Device tree:
82045ba8077SSimon Glass		CONFIG_OF_CONTROL
82145ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
82245ba8077SSimon Glass		to configure its devices, instead of relying on statically
82345ba8077SSimon Glass		compiled #defines in the board file. This option is
82445ba8077SSimon Glass		experimental and only available on a few boards. The device
82545ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
82645ba8077SSimon Glass
8272c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
8282c0f79e4SSimon Glass		be done using one of the two options below:
829bbb0b128SSimon Glass
830bbb0b128SSimon Glass		CONFIG_OF_EMBED
831bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
832bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
833bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
834bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
835bbb0b128SSimon Glass		the global data structure as gd->blob.
83645ba8077SSimon Glass
8372c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
8382c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
8392c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
8402c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
8412c0f79e4SSimon Glass
8422c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
8432c0f79e4SSimon Glass
8442c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
8452c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
8462c0f79e4SSimon Glass		still use the individual files if you need something more
8472c0f79e4SSimon Glass		exotic.
8482c0f79e4SSimon Glass
849c609719bSwdenk- Watchdog:
850c609719bSwdenk		CONFIG_WATCHDOG
851c609719bSwdenk		If this variable is defined, it enables watchdog
8526abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
8536abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
8546abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
8556abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
8566abe6fb6SDetlev Zundel		available, then no further board specific code should
8576abe6fb6SDetlev Zundel		be needed to use it.
8586abe6fb6SDetlev Zundel
8596abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
8606abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
8616abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
8626abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
863c609719bSwdenk
864c1551ea8Sstroese- U-Boot Version:
865c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
866c1551ea8Sstroese		If this variable is defined, an environment variable
867c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
868c1551ea8Sstroese		version as printed by the "version" command.
869c1551ea8Sstroese		This variable is readonly.
870c1551ea8Sstroese
871c609719bSwdenk- Real-Time Clock:
872c609719bSwdenk
873602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
874c609719bSwdenk		has to be selected, too. Define exactly one of the
875c609719bSwdenk		following options:
876c609719bSwdenk
877c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
878c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
8797ce63709SGuennadi Liakhovetski		CONFIG_RTC_MC13783	- use MC13783 RTC
880c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
8811cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
882c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
8837f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
8843bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
8859536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
8864c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
8876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
88871d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
88971d19f30SHeiko Schocher					  RV3029 RTC.
890c609719bSwdenk
891b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
892b37c7e5eSwdenk		must also be configured. See I2C Support, below.
893b37c7e5eSwdenk
894e92739d3SPeter Tyser- GPIO Support:
895e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
896e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
897e92739d3SPeter Tyser
8985dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
8995dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
9005dec49caSChris Packham		pins supported by a particular chip.
9015dec49caSChris Packham
902e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
903e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
904e92739d3SPeter Tyser
905c609719bSwdenk- Timestamp Support:
906c609719bSwdenk
907c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
908c609719bSwdenk		(date and time) of an image is printed by image
909c609719bSwdenk		commands like bootm or iminfo. This option is
910602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
911c609719bSwdenk
912c609719bSwdenk- Partition Support:
913c609719bSwdenk		CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION
91407f3d789Srichardretanubun		and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION
915c609719bSwdenk
916602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
917218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
918218ca724SWolfgang Denk		least one partition type as well.
919c609719bSwdenk
920c609719bSwdenk- IDE Reset method:
9214d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
9224d13cbadSwdenk		board configurations files but used nowhere!
923c609719bSwdenk
9244d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
9254d13cbadSwdenk		be performed by calling the function
9264d13cbadSwdenk			ide_set_reset(int reset)
9274d13cbadSwdenk		which has to be defined in a board specific file
928c609719bSwdenk
929c609719bSwdenk- ATAPI Support:
930c609719bSwdenk		CONFIG_ATAPI
931c609719bSwdenk
932c609719bSwdenk		Set this to enable ATAPI support.
933c609719bSwdenk
934c40b2956Swdenk- LBA48 Support
935c40b2956Swdenk		CONFIG_LBA48
936c40b2956Swdenk
937c40b2956Swdenk		Set this to enable support for disks larger than 137GB
9384b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
939c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
940c40b2956Swdenk		support disks up to 2.1TB.
941c40b2956Swdenk
9426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
943c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
944c40b2956Swdenk			Default is 32bit.
945c40b2956Swdenk
946c609719bSwdenk- SCSI Support:
947c609719bSwdenk		At the moment only there is only support for the
948c609719bSwdenk		SYM53C8XX SCSI controller; define
949c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
950c609719bSwdenk
9516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
9526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
9536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
954c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
955c609719bSwdenk		devices.
9566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
957c609719bSwdenk
958c609719bSwdenk- NETWORK Support (PCI):
959682011ffSwdenk		CONFIG_E1000
960682011ffSwdenk		Support for Intel 8254x gigabit chips.
961682011ffSwdenk
962ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
96311ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
964ac3315c2SAndre Schwarz
965c609719bSwdenk		CONFIG_EEPRO100
966c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
96711ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
968c609719bSwdenk		write routine for first time initialisation.
969c609719bSwdenk
970c609719bSwdenk		CONFIG_TULIP
971c609719bSwdenk		Support for Digital 2114x chips.
972c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
973c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
974c609719bSwdenk
975c609719bSwdenk		CONFIG_NATSEMI
976c609719bSwdenk		Support for National dp83815 chips.
977c609719bSwdenk
978c609719bSwdenk		CONFIG_NS8382X
979c609719bSwdenk		Support for National dp8382[01] gigabit chips.
980c609719bSwdenk
98145219c46Swdenk- NETWORK Support (other):
98245219c46Swdenk
983c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
984c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
985c041e9d2SJens Scharsig
986c041e9d2SJens Scharsig			CONFIG_RMII
987c041e9d2SJens Scharsig			Define this to use reduced MII inteface
988c041e9d2SJens Scharsig
989c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
990c041e9d2SJens Scharsig			If this defined, the driver is quiet.
991c041e9d2SJens Scharsig			The driver doen't show link status messages.
992c041e9d2SJens Scharsig
99345219c46Swdenk		CONFIG_DRIVER_LAN91C96
99445219c46Swdenk		Support for SMSC's LAN91C96 chips.
99545219c46Swdenk
99645219c46Swdenk			CONFIG_LAN91C96_BASE
99745219c46Swdenk			Define this to hold the physical address
99845219c46Swdenk			of the LAN91C96's I/O space
99945219c46Swdenk
100045219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
100145219c46Swdenk			Define this to enable 32 bit addressing
100245219c46Swdenk
1003f39748aeSwdenk		CONFIG_DRIVER_SMC91111
1004f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1005f39748aeSwdenk
1006f39748aeSwdenk			CONFIG_SMC91111_BASE
1007f39748aeSwdenk			Define this to hold the physical address
1008f39748aeSwdenk			of the device (I/O space)
1009f39748aeSwdenk
1010f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1011f39748aeSwdenk			Define this if data bus is 32 bits
1012f39748aeSwdenk
1013f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1014f39748aeSwdenk			Define this to use i/o functions instead of macros
1015f39748aeSwdenk			(some hardware wont work with macros)
1016f39748aeSwdenk
1017b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1018b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1019b3dbf4a5SMacpaul Lin
1020b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1021b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1022b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1023b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1024b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1025b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1026b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1027b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1028b3dbf4a5SMacpaul Lin
1029c2fff331SMike Rapoport		CONFIG_SMC911X
1030557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1031557b377dSJens Gehrlein
1032c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1033557b377dSJens Gehrlein			Define this to hold the physical address
1034557b377dSJens Gehrlein			of the device (I/O space)
1035557b377dSJens Gehrlein
1036c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1037557b377dSJens Gehrlein			Define this if data bus is 32 bits
1038557b377dSJens Gehrlein
1039c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1040557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1041557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1042c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1043557b377dSJens Gehrlein
10443d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
10453d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
10463d0075faSYoshihiro Shimoda
10473d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
10483d0075faSYoshihiro Shimoda			Define the number of ports to be used
10493d0075faSYoshihiro Shimoda
10503d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
10513d0075faSYoshihiro Shimoda			Define the ETH PHY's address
10523d0075faSYoshihiro Shimoda
105368260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
105468260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
105568260aabSYoshihiro Shimoda
1056c609719bSwdenk- USB Support:
1057c609719bSwdenk		At the moment only the UHCI host controller is
10584d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1059c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1060c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
106130d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1062c609719bSwdenk		storage devices.
1063c609719bSwdenk		Note:
1064c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1065c609719bSwdenk		(TEAC FD-05PUB).
10664d13cbadSwdenk		MPC5200 USB requires additional defines:
10674d13cbadSwdenk			CONFIG_USB_CLOCK
10684d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1069307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1070307ecb6dSEric Millbrandt				for USB on PSC3
10714d13cbadSwdenk			CONFIG_USB_CONFIG
10724d13cbadSwdenk				for differential drivers: 0x00001000
10734d13cbadSwdenk				for single ended drivers: 0x00005000
1074307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1075307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
10766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1077fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1078fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
10794d13cbadSwdenk
108016c8d5e7SWolfgang Denk- USB Device:
108116c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
108216c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
108316c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
108411ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
108516c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
108616c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
108716c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
108816c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
108916c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
109016c8d5e7SWolfgang Denk		a Linux host by
109116c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
109216c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
109316c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
109416c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
109516c8d5e7SWolfgang Denk
109616c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
109716c8d5e7SWolfgang Denk			Define this to build a UDC device
109816c8d5e7SWolfgang Denk
109916c8d5e7SWolfgang Denk			CONFIG_USB_TTY
110016c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
110116c8d5e7SWolfgang Denk			talk to the UDC device
110216c8d5e7SWolfgang Denk
11036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
110416c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
110516c8d5e7SWolfgang Denk			be set to usbtty.
110616c8d5e7SWolfgang Denk
110716c8d5e7SWolfgang Denk			mpc8xx:
11086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
110916c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
11106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
111116c8d5e7SWolfgang Denk
11126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
111316c8d5e7SWolfgang Denk				Derive USB clock from brgclk
11146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
111516c8d5e7SWolfgang Denk
111616c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
111716c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
111816c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
111916c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
112016c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
112116c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
112216c8d5e7SWolfgang Denk
112316c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
112416c8d5e7SWolfgang Denk			Define this string as the name of your company for
112516c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
112616c8d5e7SWolfgang Denk
112716c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
112816c8d5e7SWolfgang Denk			Define this string as the name of your product
112916c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
113016c8d5e7SWolfgang Denk
113116c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
113216c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
113316c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
113416c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
113516c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
113616c8d5e7SWolfgang Denk
113716c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
113816c8d5e7SWolfgang Denk			Define this as the unique Product ID
113916c8d5e7SWolfgang Denk			for your device
114016c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1141c609719bSwdenk
1142c609719bSwdenk
1143c609719bSwdenk- MMC Support:
1144c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1145c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1146c609719bSwdenk		accessed from the boot prompt by mapping the device
1147c609719bSwdenk		to physical memory similar to flash. Command line is
1148602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1149602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1150c609719bSwdenk
1151afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1152afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1153afb35666SYoshihiro Shimoda
1154afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1155afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1156afb35666SYoshihiro Shimoda
1157afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1158afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1159afb35666SYoshihiro Shimoda
11606705d81eSwdenk- Journaling Flash filesystem support:
11616705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
11626705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
11636705d81eSwdenk		Define these for a default partition on a NAND device
11646705d81eSwdenk
11656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
11666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
11676705d81eSwdenk		Define these for a default partition on a NOR device
11686705d81eSwdenk
11696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
11706705d81eSwdenk		Define this to create an own partition. You have to provide a
11716705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
11726705d81eSwdenk
11736705d81eSwdenk		If you define only one JFFS2 partition you may also want to
11746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
11756705d81eSwdenk		to disable the command chpart. This is the default when you
11766705d81eSwdenk		have not defined a custom partition
11776705d81eSwdenk
1178c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1179c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1180c30a15e5SDonggeun Kim		Support for saving memory data as a file
1181c30a15e5SDonggeun Kim		in FAT formatted partition
1182c30a15e5SDonggeun Kim
1183c609719bSwdenk- Keyboard Support:
1184c609719bSwdenk		CONFIG_ISA_KEYBOARD
1185c609719bSwdenk
1186c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1187c609719bSwdenk		support
1188c609719bSwdenk
1189c609719bSwdenk		CONFIG_I8042_KBD
1190c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1191c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1192c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1193c609719bSwdenk		for cfb_console. Supports cursor blinking.
1194c609719bSwdenk
1195c609719bSwdenk- Video support:
1196c609719bSwdenk		CONFIG_VIDEO
1197c609719bSwdenk
1198c609719bSwdenk		Define this to enable video support (for output to
1199c609719bSwdenk		video).
1200c609719bSwdenk
1201c609719bSwdenk		CONFIG_VIDEO_CT69000
1202c609719bSwdenk
1203c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1204c609719bSwdenk
1205c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1206eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1207eeb1b77bSwdenk		video output is selected via environment 'videoout'
1208eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1209eeb1b77bSwdenk		assumed.
1210c609719bSwdenk
1211eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
121211ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1213eeb1b77bSwdenk		are possible:
1214eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1215eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1216eeb1b77bSwdenk
1217eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1218eeb1b77bSwdenk		-------------+---------------------------------------------
1219eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1220eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1221eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1222eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1223eeb1b77bSwdenk		-------------+---------------------------------------------
1224c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1225c609719bSwdenk
1226eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
12277817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1228eeb1b77bSwdenk
1229eeb1b77bSwdenk
1230a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1231a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1232a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1233a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1234a6c7ad2fSwdenk
12357d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
12367d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
12377d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
12387d3053fbSTimur Tabi		support, and should also define these other macros:
12397d3053fbSTimur Tabi
12407d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
12417d3053fbSTimur Tabi			CONFIG_VIDEO
12427d3053fbSTimur Tabi			CONFIG_CMD_BMP
12437d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
12447d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
12457d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
12467d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
12477d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
12487d3053fbSTimur Tabi
1249ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1250ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1251ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1252ba8e76bdSTimur Tabi		description of this variable.
12537d3053fbSTimur Tabi
1254682011ffSwdenk- Keyboard Support:
1255682011ffSwdenk		CONFIG_KEYBOARD
1256682011ffSwdenk
1257682011ffSwdenk		Define this to enable a custom keyboard support.
1258682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1259682011ffSwdenk		defined in your board-specific files.
1260682011ffSwdenk		The only board using this so far is RBC823.
1261a6c7ad2fSwdenk
1262c609719bSwdenk- LCD Support:	CONFIG_LCD
1263c609719bSwdenk
1264c609719bSwdenk		Define this to enable LCD support (for output to LCD
1265c609719bSwdenk		display); also select one of the supported displays
1266c609719bSwdenk		by defining one of these:
1267c609719bSwdenk
126839cf4804SStelian Pop		CONFIG_ATMEL_LCD:
126939cf4804SStelian Pop
127039cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
127139cf4804SStelian Pop
1272fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1273c609719bSwdenk
1274fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1275c609719bSwdenk
1276fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1277c609719bSwdenk
1278fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1279fd3103bbSwdenk			Active, color, single scan.
1280fd3103bbSwdenk
1281fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1282fd3103bbSwdenk
1283fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1284c609719bSwdenk			Active, color, single scan.
1285c609719bSwdenk
1286c609719bSwdenk		CONFIG_SHARP_16x9
1287c609719bSwdenk
1288c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1289c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1290c609719bSwdenk
1291c609719bSwdenk		CONFIG_SHARP_LQ64D341
1292c609719bSwdenk
1293c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1294c609719bSwdenk			Active, color, single scan.
1295c609719bSwdenk
1296c609719bSwdenk		CONFIG_HLD1045
1297c609719bSwdenk
1298c609719bSwdenk			HLD1045 display, 640x480.
1299c609719bSwdenk			Active, color, single scan.
1300c609719bSwdenk
1301c609719bSwdenk		CONFIG_OPTREX_BW
1302c609719bSwdenk
1303c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1304c609719bSwdenk			or
1305c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1306c609719bSwdenk			or
1307c609719bSwdenk			Hitachi	 SP14Q002
1308c609719bSwdenk
1309c609719bSwdenk			320x240. Black & white.
1310c609719bSwdenk
1311c609719bSwdenk		Normally display is black on white background; define
13126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1313c609719bSwdenk
13147152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1315d791b1dcSwdenk
1316d791b1dcSwdenk		If this option is set, the environment is checked for
1317d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1318d791b1dcSwdenk		of logo, copyright and system information on the LCD
1319e94d2cd9Swdenk		is suppressed and the BMP image at the address
1320d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1321d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1322d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1323d791b1dcSwdenk		loaded very quickly after power-on.
1324d791b1dcSwdenk
13251ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
13261ca298ceSMatthias Weisser
13271ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
13281ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
13291ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
13301ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
13311ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
13321ca298ceSMatthias Weisser		specify 'm' for centering the image.
13331ca298ceSMatthias Weisser
13341ca298ceSMatthias Weisser		Example:
13351ca298ceSMatthias Weisser		setenv splashpos m,m
13361ca298ceSMatthias Weisser			=> image at center of screen
13371ca298ceSMatthias Weisser
13381ca298ceSMatthias Weisser		setenv splashpos 30,20
13391ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
13401ca298ceSMatthias Weisser
13411ca298ceSMatthias Weisser		setenv splashpos -10,m
13421ca298ceSMatthias Weisser			=> vertically centered image
13431ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
13441ca298ceSMatthias Weisser
134598f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
134698f4a3dfSStefan Roese
134798f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
134898f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
134998f4a3dfSStefan Roese		splashscreen support or the bmp command.
135098f4a3dfSStefan Roese
1351d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1352d5011762SAnatolij Gustschin
1353d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1354d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1355d5011762SAnatolij Gustschin		bmp command.
1356d5011762SAnatolij Gustschin
1357c29fdfc1Swdenk- Compression support:
1358c29fdfc1Swdenk		CONFIG_BZIP2
1359c29fdfc1Swdenk
1360c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1361c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1362c29fdfc1Swdenk		compressed images are supported.
1363c29fdfc1Swdenk
1364c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
13656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1366c29fdfc1Swdenk		be at least 4MB.
1367d791b1dcSwdenk
1368fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1369fc9c1727SLuigi 'Comio' Mantellini
1370fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1371fc9c1727SLuigi 'Comio' Mantellini		images is included.
1372fc9c1727SLuigi 'Comio' Mantellini
1373fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1374fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1375fc9c1727SLuigi 'Comio' Mantellini		formula:
1376fc9c1727SLuigi 'Comio' Mantellini
1377fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1378fc9c1727SLuigi 'Comio' Mantellini
1379fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1380fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1381fc9c1727SLuigi 'Comio' Mantellini
1382fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1383fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1384fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1385fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1386fc9c1727SLuigi 'Comio' Mantellini
1387fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1388fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
13896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1390fc9c1727SLuigi 'Comio' Mantellini
139117ea1177Swdenk- MII/PHY support:
139217ea1177Swdenk		CONFIG_PHY_ADDR
139317ea1177Swdenk
139417ea1177Swdenk		The address of PHY on MII bus.
139517ea1177Swdenk
139617ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
139717ea1177Swdenk
139817ea1177Swdenk		The clock frequency of the MII bus
139917ea1177Swdenk
140017ea1177Swdenk		CONFIG_PHY_GIGE
140117ea1177Swdenk
140217ea1177Swdenk		If this option is set, support for speed/duplex
140311ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
140417ea1177Swdenk
140517ea1177Swdenk		CONFIG_PHY_RESET_DELAY
140617ea1177Swdenk
140717ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
140817ea1177Swdenk		reset before any MII register access is possible.
140917ea1177Swdenk		For such PHY, set this option to the usec delay
141017ea1177Swdenk		required. (minimum 300usec for LXT971A)
141117ea1177Swdenk
141217ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
141317ea1177Swdenk
141417ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
141517ea1177Swdenk		command issued before MII status register can be read
141617ea1177Swdenk
1417c609719bSwdenk- Ethernet address:
1418c609719bSwdenk		CONFIG_ETHADDR
1419c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1420c609719bSwdenk		CONFIG_ETH2ADDR
1421c609719bSwdenk		CONFIG_ETH3ADDR
1422c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1423c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1424c609719bSwdenk
142511ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
142611ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1427c609719bSwdenk		is not determined automatically.
1428c609719bSwdenk
1429c609719bSwdenk- IP address:
1430c609719bSwdenk		CONFIG_IPADDR
1431c609719bSwdenk
1432c609719bSwdenk		Define a default value for the IP address to use for
143311ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1434c609719bSwdenk		determined through e.g. bootp.
14351ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1436c609719bSwdenk
1437c609719bSwdenk- Server IP address:
1438c609719bSwdenk		CONFIG_SERVERIP
1439c609719bSwdenk
1440c609719bSwdenk		Defines a default value for the IP address of a TFTP
1441c609719bSwdenk		server to contact when using the "tftboot" command.
14421ebcd654SWolfgang Denk		(Environment variable "serverip")
1443c609719bSwdenk
144497cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
144597cfe861SRobin Getz
144697cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
144797cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
144897cfe861SRobin Getz
14491ebcd654SWolfgang Denk- Gateway IP address:
14501ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
14511ebcd654SWolfgang Denk
14521ebcd654SWolfgang Denk		Defines a default value for the IP address of the
14531ebcd654SWolfgang Denk		default router where packets to other networks are
14541ebcd654SWolfgang Denk		sent to.
14551ebcd654SWolfgang Denk		(Environment variable "gatewayip")
14561ebcd654SWolfgang Denk
14571ebcd654SWolfgang Denk- Subnet mask:
14581ebcd654SWolfgang Denk		CONFIG_NETMASK
14591ebcd654SWolfgang Denk
14601ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
14611ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
14621ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
14631ebcd654SWolfgang Denk		forwarded through a router.
14641ebcd654SWolfgang Denk		(Environment variable "netmask")
14651ebcd654SWolfgang Denk
146653a5c424SDavid Updegraff- Multicast TFTP Mode:
146753a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
146853a5c424SDavid Updegraff
146953a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
147053a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
147111ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
147253a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
147353a5c424SDavid Updegraff		multicast group.
147453a5c424SDavid Updegraff
1475c609719bSwdenk- BOOTP Recovery Mode:
1476c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1477c609719bSwdenk
1478c609719bSwdenk		If you have many targets in a network that try to
1479c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1480c609719bSwdenk		systems send out BOOTP requests at precisely the same
1481c609719bSwdenk		moment (which would happen for instance at recovery
1482c609719bSwdenk		from a power failure, when all systems will try to
1483c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1484c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1485c609719bSwdenk		inserted before sending out BOOTP requests. The
14866c33c785SWolfgang Denk		following delays are inserted then:
1487c609719bSwdenk
1488c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1489c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1490c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1491c609719bSwdenk		4th and following
1492c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1493c609719bSwdenk
1494fe389a82Sstroese- DHCP Advanced Options:
14951fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
14961fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1497fe389a82Sstroese
14981fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
14991fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
15001fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
15011fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
15021fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
15031fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
15041fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
15051fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
15061fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
15071fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
15081fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
15091fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
1510fe389a82Sstroese
15115d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
15125d110f0aSWilson Callan		environment variable, not the BOOTP server.
1513fe389a82Sstroese
1514fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1515fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1516fe389a82Sstroese		than one DNS serverip is offered to the client.
1517fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1518fe389a82Sstroese		serverip will be stored in the additional environment
1519fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1520fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
15211fe80d79SJon Loeliger		is defined.
1522fe389a82Sstroese
1523fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1524fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1525fe389a82Sstroese		need the hostname of the DHCP requester.
15265d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
15271fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
15281fe80d79SJon Loeliger		option 12 to the DHCP server.
1529fe389a82Sstroese
1530d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1531d9a2f416SAras Vaichas
1532d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1533d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1534d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1535d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1536d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1537d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1538d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1539d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1540d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1541d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1542d9a2f416SAras Vaichas		this delay.
1543d9a2f416SAras Vaichas
1544a3d991bdSwdenk - CDP Options:
1545a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1546a3d991bdSwdenk
1547a3d991bdSwdenk		The device id used in CDP trigger frames.
1548a3d991bdSwdenk
1549a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1550a3d991bdSwdenk
1551a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1552a3d991bdSwdenk		of the device.
1553a3d991bdSwdenk
1554a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1555a3d991bdSwdenk
1556a3d991bdSwdenk		A printf format string which contains the ascii name of
1557a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
155811ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1559a3d991bdSwdenk
1560a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1561a3d991bdSwdenk
1562a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1563a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1564a3d991bdSwdenk
1565a3d991bdSwdenk		CONFIG_CDP_VERSION
1566a3d991bdSwdenk
1567a3d991bdSwdenk		An ascii string containing the version of the software.
1568a3d991bdSwdenk
1569a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1570a3d991bdSwdenk
1571a3d991bdSwdenk		An ascii string containing the name of the platform.
1572a3d991bdSwdenk
1573a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1574a3d991bdSwdenk
1575a3d991bdSwdenk		A 32bit integer sent on the trigger.
1576a3d991bdSwdenk
1577a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1578a3d991bdSwdenk
1579a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1580a3d991bdSwdenk		device in .1 of milliwatts.
1581a3d991bdSwdenk
1582a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1583a3d991bdSwdenk
1584a3d991bdSwdenk		A byte containing the id of the VLAN.
1585a3d991bdSwdenk
1586c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1587c609719bSwdenk
1588c609719bSwdenk		Several configurations allow to display the current
1589c609719bSwdenk		status using a LED. For instance, the LED will blink
1590c609719bSwdenk		fast while running U-Boot code, stop blinking as
1591c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1592c609719bSwdenk		start blinking slow once the Linux kernel is running
1593c609719bSwdenk		(supported by a status LED driver in the Linux
1594c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1595c609719bSwdenk		feature in U-Boot.
1596c609719bSwdenk
1597c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1598c609719bSwdenk
1599c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1600c609719bSwdenk		on those systems that support this (optional)
1601c609719bSwdenk		feature, like the TQM8xxL modules.
1602c609719bSwdenk
1603c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1604c609719bSwdenk
1605b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1606b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
160711ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1608c609719bSwdenk
1609b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1610602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1611b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1612b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1613c609719bSwdenk		command line interface.
1614c609719bSwdenk
1615bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1616c609719bSwdenk
1617b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1618b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1619b37c7e5eSwdenk		support for I2C.
1620c609719bSwdenk
1621b37c7e5eSwdenk		There are several other quantities that must also be
1622b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1623c609719bSwdenk
16246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1625b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
16266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
162711ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1628c609719bSwdenk
16298d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
1630a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
16318d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
16328d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
16338d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
1634b37c7e5eSwdenk
16355da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
16365da71efaSEric Millbrandt
16375da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
16385da71efaSEric Millbrandt		chips might think that the current transfer is still
16395da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
16405da71efaSEric Millbrandt		commands until the slave device responds.
16415da71efaSEric Millbrandt
1642b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1643b37c7e5eSwdenk
1644b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1645b37c7e5eSwdenk		then the following macros need to be defined (examples are
1646b37c7e5eSwdenk		from include/configs/lwmon.h):
1647c609719bSwdenk
1648c609719bSwdenk		I2C_INIT
1649c609719bSwdenk
1650b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1651c609719bSwdenk		controller or configure ports.
1652c609719bSwdenk
1653b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1654b37c7e5eSwdenk
1655c609719bSwdenk		I2C_PORT
1656c609719bSwdenk
1657c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1658c609719bSwdenk		assumes both bits are on the same port). Valid values
1659c609719bSwdenk		are 0..3 for ports A..D.
1660c609719bSwdenk
1661c609719bSwdenk		I2C_ACTIVE
1662c609719bSwdenk
1663c609719bSwdenk		The code necessary to make the I2C data line active
1664c609719bSwdenk		(driven).  If the data line is open collector, this
1665c609719bSwdenk		define can be null.
1666c609719bSwdenk
1667b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1668b37c7e5eSwdenk
1669c609719bSwdenk		I2C_TRISTATE
1670c609719bSwdenk
1671c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1672c609719bSwdenk		(inactive).  If the data line is open collector, this
1673c609719bSwdenk		define can be null.
1674c609719bSwdenk
1675b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1676b37c7e5eSwdenk
1677c609719bSwdenk		I2C_READ
1678c609719bSwdenk
1679c609719bSwdenk		Code that returns TRUE if the I2C data line is high,
1680c609719bSwdenk		FALSE if it is low.
1681c609719bSwdenk
1682b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1683b37c7e5eSwdenk
1684c609719bSwdenk		I2C_SDA(bit)
1685c609719bSwdenk
1686c609719bSwdenk		If <bit> is TRUE, sets the I2C data line high. If it
1687c609719bSwdenk		is FALSE, it clears it (low).
1688c609719bSwdenk
1689b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1690b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1691b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1692b37c7e5eSwdenk
1693c609719bSwdenk		I2C_SCL(bit)
1694c609719bSwdenk
1695c609719bSwdenk		If <bit> is TRUE, sets the I2C clock line high. If it
1696c609719bSwdenk		is FALSE, it clears it (low).
1697c609719bSwdenk
1698b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1699b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1700b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1701b37c7e5eSwdenk
1702c609719bSwdenk		I2C_DELAY
1703c609719bSwdenk
1704c609719bSwdenk		This delay is invoked four times per clock cycle so this
1705c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1706b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1707b37c7e5eSwdenk		like:
1708b37c7e5eSwdenk
1709b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
1710c609719bSwdenk
1711793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
1712793b5726SMike Frysinger
1713793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
1714793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
1715793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
1716793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
1717793b5726SMike Frysinger
1718793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
1719793b5726SMike Frysinger		the generic GPIO functions.
1720793b5726SMike Frysinger
17216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
172247cd00faSwdenk
172347cd00faSwdenk		When a board is reset during an i2c bus transfer
172447cd00faSwdenk		chips might think that the current transfer is still
172547cd00faSwdenk		in progress. On some boards it is possible to access
172647cd00faSwdenk		the i2c SCLK line directly, either by using the
172747cd00faSwdenk		processor pin as a GPIO or by having a second pin
172847cd00faSwdenk		connected to the bus. If this option is defined a
172947cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
173047cd00faSwdenk		is run early in the boot sequence.
173147cd00faSwdenk
173226a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
173326a33504SRichard Retanubun
173426a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
173526a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
173626a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
173726a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
173826a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
173926a33504SRichard Retanubun		controller provide such a method. It is called at the end of
174026a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
174126a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
174226a33504SRichard Retanubun
174317ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
174417ea1177Swdenk
174517ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
174617ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
174717ea1177Swdenk		variable "i2cfast". (see also i2cfast)
174817ea1177Swdenk
1749bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
1750bb99ad6dSBen Warren
1751bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
1752bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
1753bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
1754bb99ad6dSBen Warren		Note that bus numbering is zero-based.
1755bb99ad6dSBen Warren
17566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
1757bb99ad6dSBen Warren
1758bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
17590f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
17600f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
17610f89c54bSPeter Tyser		a 1D array of device addresses
1762bb99ad6dSBen Warren
1763bb99ad6dSBen Warren		e.g.
1764bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
17656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
1766bb99ad6dSBen Warren
1767bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
1768bb99ad6dSBen Warren
1769bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
17706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
1771bb99ad6dSBen Warren
1772bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
1773bb99ad6dSBen Warren
17746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
1775be5e6181STimur Tabi
1776be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
1777be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
1778be5e6181STimur Tabi
17796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
17800dc018ecSStefan Roese
17810dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
17820dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
17830dc018ecSStefan Roese
17846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
17850dc018ecSStefan Roese
17860dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
17870dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
17880dc018ecSStefan Roese
17896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
17909ebbb54fSVictor Gallardo
17919ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
17929ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
17939ebbb54fSVictor Gallardo		specified DTT device.
17949ebbb54fSVictor Gallardo
1795be5e6181STimur Tabi		CONFIG_FSL_I2C
1796be5e6181STimur Tabi
1797be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
17987817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
1799be5e6181STimur Tabi
180067b23a32SHeiko Schocher		CONFIG_I2C_MUX
180167b23a32SHeiko Schocher
180267b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
180367b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
180467b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
180567b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
180667b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
180767b23a32SHeiko Schocher		the muxes to activate this new "bus".
180867b23a32SHeiko Schocher
180967b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
181067b23a32SHeiko Schocher		feature!
181167b23a32SHeiko Schocher
181267b23a32SHeiko Schocher		Example:
181367b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
181467b23a32SHeiko Schocher			The First mux with address 70 and channel 6
181567b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
181667b23a32SHeiko Schocher
181767b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
181867b23a32SHeiko Schocher
181967b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
182067b23a32SHeiko Schocher		of I2C Busses with muxes:
182167b23a32SHeiko Schocher
182267b23a32SHeiko Schocher		=> i2c bus
182367b23a32SHeiko Schocher		Busses reached over muxes:
182467b23a32SHeiko Schocher		Bus ID: 2
182567b23a32SHeiko Schocher		  reached over Mux(es):
182667b23a32SHeiko Schocher		    pca9544a@70 ch: 4
182767b23a32SHeiko Schocher		Bus ID: 3
182867b23a32SHeiko Schocher		  reached over Mux(es):
182967b23a32SHeiko Schocher		    pca9544a@70 ch: 6
183067b23a32SHeiko Schocher		    pca9544a@71 ch: 4
183167b23a32SHeiko Schocher		=>
183267b23a32SHeiko Schocher
183367b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
1834f9a78b8dSMichael Jones		u-boot first sends the command to the mux@70 to enable
1835f9a78b8dSMichael Jones		channel 6, and then the command to the mux@71 to enable
183667b23a32SHeiko Schocher		the channel 4.
183767b23a32SHeiko Schocher
183867b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
1839f9a78b8dSMichael Jones		usual to communicate with your I2C devices behind
184067b23a32SHeiko Schocher		the 2 muxes.
184167b23a32SHeiko Schocher
184267b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
184367b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
184467b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
184567b23a32SHeiko Schocher		to add this option to other architectures.
184667b23a32SHeiko Schocher
18472ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
18482ac6985aSAndrew Dyer
18492ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
18502ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
18512ac6985aSAndrew Dyer		between writing the address pointer and reading the
18522ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
18532ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
18542ac6985aSAndrew Dyer		devices can use either method, but some require one or
18552ac6985aSAndrew Dyer		the other.
1856be5e6181STimur Tabi
1857c609719bSwdenk- SPI Support:	CONFIG_SPI
1858c609719bSwdenk
1859c609719bSwdenk		Enables SPI driver (so far only tested with
1860c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
1861c609719bSwdenk		D/As on the SACSng board)
1862c609719bSwdenk
18636639562eSYoshihiro Shimoda		CONFIG_SH_SPI
18646639562eSYoshihiro Shimoda
18656639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
18666639562eSYoshihiro Shimoda		only SH7757 is supported.
18676639562eSYoshihiro Shimoda
1868c609719bSwdenk		CONFIG_SPI_X
1869c609719bSwdenk
1870c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
1871c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
1872c609719bSwdenk
1873c609719bSwdenk		CONFIG_SOFT_SPI
1874c609719bSwdenk
1875c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
1876c609719bSwdenk		using hardware support. This is a general purpose
1877c609719bSwdenk		driver that only requires three general I/O port pins
1878c609719bSwdenk		(two outputs, one input) to function. If this is
1879c609719bSwdenk		defined, the board configuration must define several
1880c609719bSwdenk		SPI configuration items (port pins to use, etc). For
1881c609719bSwdenk		an example, see include/configs/sacsng.h.
1882c609719bSwdenk
188304a9e118SBen Warren		CONFIG_HARD_SPI
188404a9e118SBen Warren
188504a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
188604a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
188704a9e118SBen Warren		must define a list of chip-select function pointers.
188804a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
188904a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
189004a9e118SBen Warren
189138254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
189238254f45SGuennadi Liakhovetski
189338254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
189438254f45SGuennadi Liakhovetski		SoCs. Currently only i.MX31 is supported.
189538254f45SGuennadi Liakhovetski
18960133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
18970133502eSMatthias Fuchs
18980133502eSMatthias Fuchs		Enables FPGA subsystem.
18990133502eSMatthias Fuchs
19000133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
19010133502eSMatthias Fuchs
19020133502eSMatthias Fuchs		Enables support for specific chip vendors.
19030133502eSMatthias Fuchs		(ALTERA, XILINX)
19040133502eSMatthias Fuchs
19050133502eSMatthias Fuchs		CONFIG_FPGA_<family>
19060133502eSMatthias Fuchs
19070133502eSMatthias Fuchs		Enables support for FPGA family.
19080133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
19090133502eSMatthias Fuchs
19100133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
1911c609719bSwdenk
1912c609719bSwdenk		Specify the number of FPGA devices to support.
1913c609719bSwdenk
19146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
1915c609719bSwdenk
1916c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
1917c609719bSwdenk
19186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
1919c609719bSwdenk
1920c609719bSwdenk		Enable checks on FPGA configuration interface busy
1921c609719bSwdenk		status by the configuration function. This option
1922c609719bSwdenk		will require a board or device specific function to
1923c609719bSwdenk		be written.
1924c609719bSwdenk
1925c609719bSwdenk		CONFIG_FPGA_DELAY
1926c609719bSwdenk
1927c609719bSwdenk		If defined, a function that provides delays in the FPGA
1928c609719bSwdenk		configuration driver.
1929c609719bSwdenk
19306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
1931c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
1932c609719bSwdenk
19336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
1934c609719bSwdenk
1935c609719bSwdenk		Check for configuration errors during FPGA bitfile
1936c609719bSwdenk		loading. For example, abort during Virtex II
1937c609719bSwdenk		configuration if the INIT_B line goes low (which
1938c609719bSwdenk		indicated a CRC error).
1939c609719bSwdenk
19406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
1941c609719bSwdenk
1942c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
1943c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
1944c609719bSwdenk		FPGA configuration sequence. The default time is 500
194511ccc33fSMarcel Ziswiler		ms.
1946c609719bSwdenk
19476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
1948c609719bSwdenk
1949c609719bSwdenk		Maximum time to wait for BUSY to deassert during
195011ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
1951c609719bSwdenk
19526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
1953c609719bSwdenk
1954c609719bSwdenk		Time to wait after FPGA configuration. The default is
195511ccc33fSMarcel Ziswiler		200 ms.
1956c609719bSwdenk
1957c609719bSwdenk- Configuration Management:
1958c609719bSwdenk		CONFIG_IDENT_STRING
1959c609719bSwdenk
1960c609719bSwdenk		If defined, this string will be added to the U-Boot
1961c609719bSwdenk		version information (U_BOOT_VERSION)
1962c609719bSwdenk
1963c609719bSwdenk- Vendor Parameter Protection:
1964c609719bSwdenk
1965c609719bSwdenk		U-Boot considers the values of the environment
1966c609719bSwdenk		variables "serial#" (Board Serial Number) and
19677152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
1968c609719bSwdenk		are set once by the board vendor / manufacturer, and
1969c609719bSwdenk		protects these variables from casual modification by
1970c609719bSwdenk		the user. Once set, these variables are read-only,
1971c609719bSwdenk		and write or delete attempts are rejected. You can
197211ccc33fSMarcel Ziswiler		change this behaviour:
1973c609719bSwdenk
1974c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
1975c609719bSwdenk		file, the write protection for vendor parameters is
197647cd00faSwdenk		completely disabled. Anybody can change or delete
1977c609719bSwdenk		these parameters.
1978c609719bSwdenk
1979c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
1980c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
198111ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
1982c609719bSwdenk		which can be changed exactly ONCE by the user. [The
1983c609719bSwdenk		serial# is unaffected by this, i. e. it remains
1984c609719bSwdenk		read-only.]
1985c609719bSwdenk
1986c609719bSwdenk- Protected RAM:
1987c609719bSwdenk		CONFIG_PRAM
1988c609719bSwdenk
1989c609719bSwdenk		Define this variable to enable the reservation of
1990c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
1991c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
1992c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
1993c609719bSwdenk		this default value by defining an environment
1994c609719bSwdenk		variable "pram" to the number of kB you want to
1995c609719bSwdenk		reserve. Note that the board info structure will
1996c609719bSwdenk		still show the full amount of RAM. If pRAM is
1997c609719bSwdenk		reserved, a new environment variable "mem" will
1998c609719bSwdenk		automatically be defined to hold the amount of
1999c609719bSwdenk		remaining RAM in a form that can be passed as boot
2000c609719bSwdenk		argument to Linux, for instance like that:
2001c609719bSwdenk
2002fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2003c609719bSwdenk			saveenv
2004c609719bSwdenk
2005c609719bSwdenk		This way you can tell Linux not to use this memory,
2006c609719bSwdenk		either, which results in a memory region that will
2007c609719bSwdenk		not be affected by reboots.
2008c609719bSwdenk
2009c609719bSwdenk		*WARNING* If your board configuration uses automatic
2010c609719bSwdenk		detection of the RAM size, you must make sure that
2011c609719bSwdenk		this memory test is non-destructive. So far, the
2012c609719bSwdenk		following board configurations are known to be
2013c609719bSwdenk		"pRAM-clean":
2014c609719bSwdenk
2015c609719bSwdenk			ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL,
2016c609719bSwdenk			HERMES, IP860, RPXlite, LWMON, LANTEC,
2017544d97e9SWolfgang Denk			FLAGADM, TQM8260
2018c609719bSwdenk
2019c609719bSwdenk- Error Recovery:
2020c609719bSwdenk		CONFIG_PANIC_HANG
2021c609719bSwdenk
2022c609719bSwdenk		Define this variable to stop the system in case of a
2023c609719bSwdenk		fatal error, so that you have to reset it manually.
2024c609719bSwdenk		This is probably NOT a good idea for an embedded
202511ccc33fSMarcel Ziswiler		system where you want the system to reboot
2026c609719bSwdenk		automatically as fast as possible, but it may be
2027c609719bSwdenk		useful during development since you can try to debug
2028c609719bSwdenk		the conditions that lead to the situation.
2029c609719bSwdenk
2030c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2031c609719bSwdenk
2032c609719bSwdenk		This variable defines the number of retries for
2033c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2034c609719bSwdenk		before giving up the operation. If not defined, a
2035c609719bSwdenk		default value of 5 is used.
2036c609719bSwdenk
203740cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
203840cb90eeSGuennadi Liakhovetski
203940cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
204040cb90eeSGuennadi Liakhovetski
2041c609719bSwdenk- Command Interpreter:
20428078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
204304a85b3bSwdenk
204404a85b3bSwdenk		Enable auto completion of commands using TAB.
204504a85b3bSwdenk
20468078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
20478078f1a5SWolfgang Denk		for the "hush" shell.
20488078f1a5SWolfgang Denk
20498078f1a5SWolfgang Denk
20506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2051c609719bSwdenk
2052c609719bSwdenk		Define this variable to enable the "hush" shell (from
2053c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2054c609719bSwdenk		powerful command line syntax like
2055c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2056c609719bSwdenk		constructs ("shell scripts").
2057c609719bSwdenk
2058c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2059c609719bSwdenk		with a somewhat smaller memory footprint.
2060c609719bSwdenk
2061c609719bSwdenk
20626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2063c609719bSwdenk
2064c609719bSwdenk		This defines the secondary prompt string, which is
2065c609719bSwdenk		printed when the command interpreter needs more input
2066c609719bSwdenk		to complete a command. Usually "> ".
2067c609719bSwdenk
2068c609719bSwdenk	Note:
2069c609719bSwdenk
2070c609719bSwdenk		In the current implementation, the local variables
2071c609719bSwdenk		space and global environment variables space are
2072c609719bSwdenk		separated. Local variables are those you define by
20733b57fe0aSwdenk		simply typing `name=value'. To access a local
2074c609719bSwdenk		variable later on, you have write `$name' or
20753b57fe0aSwdenk		`${name}'; to execute the contents of a variable
20763b57fe0aSwdenk		directly type `$name' at the command prompt.
2077c609719bSwdenk
2078c609719bSwdenk		Global environment variables are those you use
2079c609719bSwdenk		setenv/printenv to work with. To run a command stored
2080c609719bSwdenk		in such a variable, you need to use the run command,
2081c609719bSwdenk		and you must not use the '$' sign to access them.
2082c609719bSwdenk
2083c609719bSwdenk		To store commands and special characters in a
2084c609719bSwdenk		variable, please use double quotation marks
2085c609719bSwdenk		surrounding the whole text of the variable, instead
2086c609719bSwdenk		of the backslashes before semicolons and special
2087c609719bSwdenk		symbols.
2088c609719bSwdenk
2089aa0c71acSWolfgang Denk- Commandline Editing and History:
2090aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2091aa0c71acSWolfgang Denk
209211ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2093aa0c71acSWolfgang Denk		commandline input operations
2094aa0c71acSWolfgang Denk
2095a8c7c708Swdenk- Default Environment:
2096c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2097c609719bSwdenk
2098c609719bSwdenk		Define this to contain any number of null terminated
2099c609719bSwdenk		strings (variable = value pairs) that will be part of
21007152b1d0Swdenk		the default environment compiled into the boot image.
21012262cfeeSwdenk
2102c609719bSwdenk		For example, place something like this in your
2103c609719bSwdenk		board's config file:
2104c609719bSwdenk
2105c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2106c609719bSwdenk			"myvar1=value1\0" \
2107c609719bSwdenk			"myvar2=value2\0"
2108c609719bSwdenk
2109c609719bSwdenk		Warning: This method is based on knowledge about the
2110c609719bSwdenk		internal format how the environment is stored by the
21112262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2112c609719bSwdenk		interface! Although it is unlikely that this format
21137152b1d0Swdenk		will change soon, there is no guarantee either.
2114c609719bSwdenk		You better know what you are doing here.
2115c609719bSwdenk
2116c609719bSwdenk		Note: overly (ab)use of the default environment is
2117c609719bSwdenk		discouraged. Make sure to check other ways to preset
211874de7aefSWolfgang Denk		the environment like the "source" command or the
2119c609719bSwdenk		boot command first.
2120c609719bSwdenk
2121a8c7c708Swdenk- DataFlash Support:
21222abbe075Swdenk		CONFIG_HAS_DATAFLASH
21232abbe075Swdenk
21242abbe075Swdenk		Defining this option enables DataFlash features and
21252abbe075Swdenk		allows to read/write in Dataflash via the standard
21262abbe075Swdenk		commands cp, md...
21272abbe075Swdenk
21283f85ce27Swdenk- SystemACE Support:
21293f85ce27Swdenk		CONFIG_SYSTEMACE
21303f85ce27Swdenk
21313f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
21323f85ce27Swdenk		chips attached via some sort of local bus. The address
213311ccc33fSMarcel Ziswiler		of the chip must also be defined in the
21346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
21353f85ce27Swdenk
21363f85ce27Swdenk		#define CONFIG_SYSTEMACE
21376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
21383f85ce27Swdenk
21393f85ce27Swdenk		When SystemACE support is added, the "ace" device type
21403f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
21413f85ce27Swdenk
2142ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2143ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2144ecb0ccd9SWolfgang Denk
214528cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2146ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
214728cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2148ecb0ccd9SWolfgang Denk		number generator is used.
2149ecb0ccd9SWolfgang Denk
215028cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
215128cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
215228cb9375SWolfgang Denk		defined, the normal port 69 is used.
215328cb9375SWolfgang Denk
215428cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2155ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2156ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2157ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2158ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2159ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2160ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2161ecb0ccd9SWolfgang Denk
2162a8c7c708Swdenk- Show boot progress:
2163c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2164c609719bSwdenk
2165c609719bSwdenk		Defining this option allows to add some board-
2166c609719bSwdenk		specific code (calling a user-provided function
2167c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2168c609719bSwdenk		the system's boot progress on some display (for
2169c609719bSwdenk		example, some LED's) on your board. At the moment,
2170c609719bSwdenk		the following checkpoints are implemented:
2171c609719bSwdenk
21721372cce2SMarian BalakowiczLegacy uImage format:
21731372cce2SMarian Balakowicz
2174c609719bSwdenk  Arg	Where			When
2175c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2176c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2177c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2178c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2179c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2180c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2181c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2182c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2183c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
21841372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2185c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2186c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2187c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2188c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
21891372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2190c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
21911372cce2SMarian Balakowicz
21921372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
21931372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
21941372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
21951372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
21961372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
21971372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
21981372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
219911ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
22001372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
22011372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
22021372cce2SMarian Balakowicz
2203ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2204c609719bSwdenk
2205a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
220663e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
220763e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
220863e73c9aSwdenk
2209566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2210566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2211566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2212566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2213566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2214566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2215566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2216566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2217566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2218566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2219566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2220566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2221566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2222566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2223566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2224566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2225566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2226566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2227566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2228566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2229566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2230566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2231566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2232566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2233566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2234566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2235566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2236566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2237566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2238566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2239566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2240566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2241566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2242566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2243566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2244566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2245566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2246566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2247566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2248566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2249566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2250566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2251566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2252566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2253566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2254566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2255566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2256c609719bSwdenk
2257566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2258c609719bSwdenk
2259566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2260566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2261566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2262206c60cbSwdenk
2263566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2264566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
226511ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2266566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2267566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2268566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
226974de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
227074de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2271566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2272c609719bSwdenk
22731372cce2SMarian BalakowiczFIT uImage format:
22741372cce2SMarian Balakowicz
22751372cce2SMarian Balakowicz  Arg	Where			When
22761372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
22771372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
22781372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
22791372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
22801372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
22811372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2282f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
22831372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
22841372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
22851372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
22861372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
22871372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
228811ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
228911ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
22901372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
22911372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
22921372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
22931372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
22941372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
22951372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
22961372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
22971372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
22981372cce2SMarian Balakowicz
22991372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
23001372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
23011372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
230211ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
23031372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
23041372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
23051372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
23061372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
23071372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
23081372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
23091372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
23101372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
23111372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
23121372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
23131372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
23141372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
23151372cce2SMarian Balakowicz
231611ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
23171372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
23181372cce2SMarian Balakowicz
231911ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
23201372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
23211372cce2SMarian Balakowicz
232211ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
23231372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
23241372cce2SMarian Balakowicz
23254cf2609bSWolfgang Denk- Standalone program support:
23264cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
23274cf2609bSWolfgang Denk
23286feff899SWolfgang Denk		This option defines a board specific value for the
23296feff899SWolfgang Denk		address where standalone program gets loaded, thus
23306feff899SWolfgang Denk		overwriting the architecture dependent default
23314cf2609bSWolfgang Denk		settings.
23324cf2609bSWolfgang Denk
23334cf2609bSWolfgang Denk- Frame Buffer Address:
23344cf2609bSWolfgang Denk		CONFIG_FB_ADDR
23354cf2609bSWolfgang Denk
23364cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
23374cf2609bSWolfgang Denk		address for frame buffer.
23384cf2609bSWolfgang Denk		Then system will reserve the frame buffer address to
23394cf2609bSWolfgang Denk		defined address instead of lcd_setmem (this function
23406feff899SWolfgang Denk		grabs the memory for frame buffer by panel's size).
23414cf2609bSWolfgang Denk
23424cf2609bSWolfgang Denk		Please see board_init_f function.
23434cf2609bSWolfgang Denk
2344cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2345cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2346cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2347cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2348cccfc2abSDetlev Zundel
2349cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2350cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2351cccfc2abSDetlev Zundel
2352cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2353cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2354cccfc2abSDetlev Zundel
2355cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2356cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2357cccfc2abSDetlev Zundel
2358cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2359cccfc2abSDetlev Zundel
2360cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2361cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2362cccfc2abSDetlev Zundel
23636a11cf48SDaniel Schwierzeck- SPL framework
23646a11cf48SDaniel Schwierzeck		CONFIG_SPL
23656a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
23666a11cf48SDaniel Schwierzeck
23676a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
23686a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
23696a11cf48SDaniel Schwierzeck
23706a11cf48SDaniel Schwierzeck		CONFIG_SPL_LDSCRIPT
23716a11cf48SDaniel Schwierzeck		LDSCRIPT for linking the SPL binary.
23726a11cf48SDaniel Schwierzeck
23736a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
23746a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
23756a11cf48SDaniel Schwierzeck
23766a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
23776a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
23786a11cf48SDaniel Schwierzeck
23796a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
23806a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
23816a11cf48SDaniel Schwierzeck
23826a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
23836a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
23846a11cf48SDaniel Schwierzeck
23856a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
23866a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
23876a11cf48SDaniel Schwierzeck
23886a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
23896a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
23906a11cf48SDaniel Schwierzeck
23916a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
23926a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
23936a11cf48SDaniel Schwierzeck
23946a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
23956a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
23966a11cf48SDaniel Schwierzeck
23976a11cf48SDaniel Schwierzeck		CONFIG_SPL_FAT_SUPPORT
23986a11cf48SDaniel Schwierzeck		Support for fs/fat/libfat.o in SPL binary
23996a11cf48SDaniel Schwierzeck
24006a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
24016a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
24021372cce2SMarian Balakowicz
2403c609719bSwdenkModem Support:
2404c609719bSwdenk--------------
2405c609719bSwdenk
2406566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
2407c609719bSwdenk
240811ccc33fSMarcel Ziswiler- Modem support enable:
2409c609719bSwdenk		CONFIG_MODEM_SUPPORT
2410c609719bSwdenk
2411c609719bSwdenk- RTS/CTS Flow control enable:
2412c609719bSwdenk		CONFIG_HWFLOW
2413c609719bSwdenk
2414c609719bSwdenk- Modem debug support:
2415c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
2416c609719bSwdenk
2417c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
2418c609719bSwdenk		for modem support. Useful only with BDI2000.
2419c609719bSwdenk
2420a8c7c708Swdenk- Interrupt support (PPC):
2421a8c7c708Swdenk
2422a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
2423a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
242411ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
2425a8c7c708Swdenk		should set decrementer_count to appropriate value. If
242611ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
2427a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
242811ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
2429a8c7c708Swdenk		specific handling. If board has watchdog / status_led
2430a8c7c708Swdenk		/ other_activity_monitor it works automatically from
2431a8c7c708Swdenk		general timer_interrupt().
2432a8c7c708Swdenk
2433c609719bSwdenk- General:
2434c609719bSwdenk
2435c609719bSwdenk		In the target system modem support is enabled when a
2436c609719bSwdenk		specific key (key combination) is pressed during
2437c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
243811ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
2439c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
2440c609719bSwdenk		function, returning 1 and thus enabling modem
2441c609719bSwdenk		initialization.
2442c609719bSwdenk
2443c609719bSwdenk		If there are no modem init strings in the
2444c609719bSwdenk		environment, U-Boot proceed to autoboot; the
2445c609719bSwdenk		previous output (banner, info printfs) will be
244611ccc33fSMarcel Ziswiler		suppressed, though.
2447c609719bSwdenk
2448c609719bSwdenk		See also: doc/README.Modem
2449c609719bSwdenk
2450*9660e442SHelmut RaigerBoard initialization settings:
2451*9660e442SHelmut Raiger------------------------------
2452*9660e442SHelmut Raiger
2453*9660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
2454*9660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
2455*9660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
2456*9660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
2457*9660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
2458*9660e442SHelmut Raigertypically in board_init_f() and board_init_r().
2459*9660e442SHelmut Raiger
2460*9660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
2461*9660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
2462*9660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
2463*9660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
2464c609719bSwdenk
2465c609719bSwdenkConfiguration Settings:
2466c609719bSwdenk-----------------------
2467c609719bSwdenk
24686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
2469c609719bSwdenk		undefine this when you're short of memory.
2470c609719bSwdenk
24712fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
24722fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
24732fb2604dSPeter Tyser
24746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
2475c609719bSwdenk		prompt for user input.
2476c609719bSwdenk
24776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
2478c609719bSwdenk
24796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
2480c609719bSwdenk
24816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
2482c609719bSwdenk
24836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
2484c609719bSwdenk		the application (usually a Linux kernel) when it is
2485c609719bSwdenk		booted
2486c609719bSwdenk
24876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
2488c609719bSwdenk		List of legal baudrate settings for this board.
2489c609719bSwdenk
24906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
2491c609719bSwdenk		Suppress display of console information at boot.
2492c609719bSwdenk
24936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
2494c609719bSwdenk		If the board specific function
2495c609719bSwdenk			extern int overwrite_console (void);
2496c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
2497c609719bSwdenk		serial port, else the settings in the environment are used.
2498c609719bSwdenk
24996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
2500c609719bSwdenk		Enable the call to overwrite_console().
2501c609719bSwdenk
25026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
2503c609719bSwdenk		Enable overwrite of previous console environment settings.
2504c609719bSwdenk
25056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
2506c609719bSwdenk		Begin and End addresses of the area used by the
2507c609719bSwdenk		simple memory test.
2508c609719bSwdenk
25096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
2510c609719bSwdenk		Enable an alternate, more extensive memory test.
2511c609719bSwdenk
25126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
25135f535fe1Swdenk		Scratch address used by the alternate memory test
25145f535fe1Swdenk		You only need to set this if address zero isn't writeable
25155f535fe1Swdenk
25166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
25176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
251814f73ca6SStefan Roese		this specified memory area will get subtracted from the top
251911ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
252014f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
252114f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
252214f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
25235e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
252414f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
25255e12e75dSStefan Roese		will have to get fixed in Linux additionally.
252614f73ca6SStefan Roese
252714f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
252814f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
252914f73ca6SStefan Roese		be touched.
253014f73ca6SStefan Roese
253114f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
253214f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
253314f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
253414f73ca6SStefan Roese		non page size aligned address and this could cause major
253514f73ca6SStefan Roese		problems.
253614f73ca6SStefan Roese
25376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR:
2538c609719bSwdenk		Default load address for network file downloads
2539c609719bSwdenk
25406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
2541c609719bSwdenk		Enable temporary baudrate change while serial download
2542c609719bSwdenk
25436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
2544c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
2545c609719bSwdenk
25466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
2547c609719bSwdenk		Physical start address of Motherboard I/O (if using a
2548c609719bSwdenk		Cogent motherboard)
2549c609719bSwdenk
25506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
2551c609719bSwdenk		Physical start address of Flash memory.
2552c609719bSwdenk
25536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
2554c609719bSwdenk		Physical start address of boot monitor code (set by
2555c609719bSwdenk		make config files to be same as the text base address
255614d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
25576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
2558c609719bSwdenk
25596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
25603b57fe0aSwdenk		Size of memory reserved for monitor code, used to
25613b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
25623b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
25633b57fe0aSwdenk		flash sector.
2564c609719bSwdenk
25656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
2566c609719bSwdenk		Size of DRAM reserved for malloc() use.
2567c609719bSwdenk
25686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
256915940c9aSStefan Roese		Normally compressed uImages are limited to an
257015940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
25716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
257215940c9aSStefan Roese		to adjust this setting to your needs.
2573c609719bSwdenk
25746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
2575c609719bSwdenk		Maximum size of memory mapped by the startup code of
2576c609719bSwdenk		the Linux kernel; all data that must be processed by
25777d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
25787d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
25797d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
25807d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
2581c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
2582c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
2583c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
2584c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
2585c609719bSwdenk
2586fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
2587fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
2588fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
2589fca43cc8SJohn Rigby		is enabled.
2590fca43cc8SJohn Rigby
2591fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
2592fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
2593fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
2594fca43cc8SJohn Rigby
2595fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
2596fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
2597fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
2598fca43cc8SJohn Rigby
25996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
2600c609719bSwdenk		Max number of Flash memory banks
2601c609719bSwdenk
26026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
2603c609719bSwdenk		Max number of sectors on a Flash chip
2604c609719bSwdenk
26056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
2606c609719bSwdenk		Timeout for Flash erase operations (in ms)
2607c609719bSwdenk
26086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
2609c609719bSwdenk		Timeout for Flash write operations (in ms)
2610c609719bSwdenk
26116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
26128564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
26138564acf9Swdenk
26146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
26158564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
26168564acf9Swdenk
26176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
26188564acf9Swdenk		If defined, hardware flash sectors protection is used
26198564acf9Swdenk		instead of U-Boot software protection.
26208564acf9Swdenk
26216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
2622c609719bSwdenk
2623c609719bSwdenk		Enable TFTP transfers directly to flash memory;
2624c609719bSwdenk		without this option such a download has to be
2625c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
2626c609719bSwdenk		copy from RAM to flash.
2627c609719bSwdenk
2628c609719bSwdenk		The two-step approach is usually more reliable, since
2629c609719bSwdenk		you can check if the download worked before you erase
263011ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
263111ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
2632c609719bSwdenk		downloaded image) this option may be very useful.
2633c609719bSwdenk
26346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
2635c609719bSwdenk		Define if the flash driver uses extra elements in the
26365653fc33Swdenk		common flash structure for storing flash geometry.
26375653fc33Swdenk
263800b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
26395653fc33Swdenk		This option also enables the building of the cfi_flash driver
26405653fc33Swdenk		in the drivers directory
264153cf9435Sstroese
264291809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
264391809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
264491809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
264591809ed5SPiotr Ziecik		to the MTD layer.
264691809ed5SPiotr Ziecik
26476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
264896ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
264996ef831fSGuennadi Liakhovetski
265096ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
265196ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
265296ef831fSGuennadi Liakhovetski		write commands.
265396ef831fSGuennadi Liakhovetski
26546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
26555568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
26565568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
26575568e613SStefan Roese		is useful, if some of the configured banks are only
26585568e613SStefan Roese		optionally available.
26595568e613SStefan Roese
26609a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
26619a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
26629a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
26639a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
26649a042e9cSJerry Van Baren
26656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
266611ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
266711ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
266853cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
266953cf9435Sstroese		buffers can be full shortly after enabling the interface
267011ccc33fSMarcel Ziswiler		on high Ethernet traffic.
267153cf9435Sstroese		Defaults to 4 if not defined.
2672c609719bSwdenk
2673ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
2674ea882bafSWolfgang Denk
2675ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
2676ea882bafSWolfgang Denk	internally to store the environment settings. The default
2677ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
2678ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
2679ea882bafSWolfgang Denk	lib/hashtable.c for details.
2680ea882bafSWolfgang Denk
2681c609719bSwdenkThe following definitions that deal with the placement and management
2682c609719bSwdenkof environment data (variable area); in general, we support the
2683c609719bSwdenkfollowing configurations:
2684c609719bSwdenk
2685c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
2686c3eb3fe4SMike Frysinger
2687c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
2688c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
2689c3eb3fe4SMike Frysinger
26905a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
2691c609719bSwdenk
2692c609719bSwdenk	Define this if the environment is in flash memory.
2693c609719bSwdenk
2694c609719bSwdenk	a) The environment occupies one whole flash sector, which is
2695c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
2696c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
2697c609719bSwdenk	   sector" type flash chips, which have several smaller
2698c609719bSwdenk	   sectors at the start or the end. For instance, such a
2699c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
2700c609719bSwdenk	   such a case you would place the environment in one of the
2701c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
2702c609719bSwdenk	   "top boot sector" type flash chips, you would put the
2703c609719bSwdenk	   environment in one of the last sectors, leaving a gap
2704c609719bSwdenk	   between U-Boot and the environment.
2705c609719bSwdenk
27060e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
2707c609719bSwdenk
2708c609719bSwdenk	   Offset of environment data (variable area) to the
2709c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
2710c609719bSwdenk	   type flash chips the second sector can be used: the offset
2711c609719bSwdenk	   for this sector is given here.
2712c609719bSwdenk
27136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
2714c609719bSwdenk
27150e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
2716c609719bSwdenk
2717c609719bSwdenk	   This is just another way to specify the start address of
2718c609719bSwdenk	   the flash sector containing the environment (instead of
27190e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
2720c609719bSwdenk
27210e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
2722c609719bSwdenk
2723c609719bSwdenk	   Size of the sector containing the environment.
2724c609719bSwdenk
2725c609719bSwdenk
2726c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
2727c609719bSwdenk	   In such a case you don't want to spend a whole sector for
2728c609719bSwdenk	   the environment.
2729c609719bSwdenk
27300e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2731c609719bSwdenk
27325a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
27330e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
2734c609719bSwdenk	   of this flash sector for the environment. This saves
2735c609719bSwdenk	   memory for the RAM copy of the environment.
2736c609719bSwdenk
2737c609719bSwdenk	   It may also save flash memory if you decide to use this
2738c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
2739c609719bSwdenk	   since then the remainder of the flash sector could be used
2740c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
2741c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
2742c609719bSwdenk	   updating the environment in flash makes it always
2743c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
2744c609719bSwdenk	   wrong before the contents has been restored from a copy in
2745c609719bSwdenk	   RAM, your target system will be dead.
2746c609719bSwdenk
27470e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
27480e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
2749c609719bSwdenk
2750c609719bSwdenk	   These settings describe a second storage area used to hold
275111ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
27523e38691eSwdenk	   a valid backup copy in case there is a power failure during
2753c609719bSwdenk	   a "saveenv" operation.
2754c609719bSwdenk
2755c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
2756c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
2757c609719bSwdenkaccordingly!
2758c609719bSwdenk
2759c609719bSwdenk
27609314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
2761c609719bSwdenk
2762c609719bSwdenk	Define this if you have some non-volatile memory device
2763c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
2764c609719bSwdenk	environment.
2765c609719bSwdenk
27660e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
27670e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2768c609719bSwdenk
276911ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
2770c609719bSwdenk	  want to use for environment. It is assumed that this memory
2771c609719bSwdenk	  can just be read and written to, without any special
2772c609719bSwdenk	  provision.
2773c609719bSwdenk
2774c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
2775c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
277611ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
2777c609719bSwdenkU-Boot will hang.
2778c609719bSwdenk
2779c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
2780c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
2781c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
2782c609719bSwdenkto save the current settings.
2783c609719bSwdenk
2784c609719bSwdenk
2785bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
2786c609719bSwdenk
2787c609719bSwdenk	Use this if you have an EEPROM or similar serial access
2788c609719bSwdenk	device and a driver for it.
2789c609719bSwdenk
27900e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
27910e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
2792c609719bSwdenk
2793c609719bSwdenk	  These two #defines specify the offset and size of the
2794c609719bSwdenk	  environment area within the total memory of your EEPROM.
2795c609719bSwdenk
27966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
2797c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
2798c609719bSwdenk	  The default address is zero.
2799c609719bSwdenk
28006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
2801c609719bSwdenk	  If defined, the number of bits used to address bytes in a
2802c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
2803c609719bSwdenk	  would require six bits.
2804c609719bSwdenk
28056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
2806c609719bSwdenk	  If defined, the number of milliseconds to delay between
2807c609719bSwdenk	  page writes.	The default is zero milliseconds.
2808c609719bSwdenk
28096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
2810c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
2811c609719bSwdenk	  that this is NOT the chip address length!
2812c609719bSwdenk
28136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
28145cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
28155cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
28165cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
28175cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
28185cf91d6bSwdenk	  byte chips.
28195cf91d6bSwdenk
28205cf91d6bSwdenk	  Note that we consider the length of the address field to
28215cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
28225cf91d6bSwdenk	  in the chip address.
28235cf91d6bSwdenk
28246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
2825c609719bSwdenk	  The size in bytes of the EEPROM device.
2826c609719bSwdenk
2827548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
2828548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
2829548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
2830548738b4SHeiko Schocher
2831548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
2832548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
2833548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
2834548738b4SHeiko Schocher	  EEPROM. For example:
2835548738b4SHeiko Schocher
2836548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
2837548738b4SHeiko Schocher
2838548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
2839548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
2840c609719bSwdenk
2841057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
28425779d8d9Swdenk
28435779d8d9Swdenk	Define this if you have a DataFlash memory device which you
28445779d8d9Swdenk	want to use for the environment.
28455779d8d9Swdenk
28460e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
28470e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
28480e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
28495779d8d9Swdenk
28505779d8d9Swdenk	  These three #defines specify the offset and size of the
28515779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
28525779d8d9Swdenk	  at the specified address.
28535779d8d9Swdenk
285451bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
285513a5695bSwdenk
285613a5695bSwdenk	Define this if you have a NAND device which you want to use
285713a5695bSwdenk	for the environment.
285813a5695bSwdenk
28590e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
28600e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
286113a5695bSwdenk
286213a5695bSwdenk	  These two #defines specify the offset and size of the environment
2863fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
2864fdd813deSScott Wood	  aligned to an erase block boundary.
28655779d8d9Swdenk
2866fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
2867e443c944SMarkus Klotzbuecher
28680e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
2869fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
2870fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
2871fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
2872fdd813deSScott Wood	  aligned to an erase block boundary.
2873e443c944SMarkus Klotzbuecher
2874fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
2875fdd813deSScott Wood
2876fdd813deSScott Wood	  Specifies the length of the region in which the environment
2877fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
2878fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
2879fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
2880fdd813deSScott Wood	  the range to be avoided.
2881fdd813deSScott Wood
2882fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
2883fdd813deSScott Wood
2884fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
2885fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
2886fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
2887fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
2888fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
2889e443c944SMarkus Klotzbuecher
2890b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
2891b74ab737SGuennadi Liakhovetski
2892b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
2893b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
2894b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
2895b74ab737SGuennadi Liakhovetski
28966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
2897c609719bSwdenk
2898c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
2899c609719bSwdenk	area is used at an early stage (ROM part) if the environment
2900c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
2901c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
2902c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
2903c609719bSwdenk	to be a good choice since it makes it far enough from the
2904c609719bSwdenk	start of the data area as well as from the stack pointer.
2905c609719bSwdenk
2906e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
2907c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
2908cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
2909c609719bSwdenkuntil then to read environment variables.
2910c609719bSwdenk
291185ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
291285ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
291385ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
291485ec0bccSwdenknecessary, because the first environment variable we need is the
291585ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
291685ec0bccSwdenkhave any device yet where we could complain.]
2917c609719bSwdenk
2918c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
2919c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
292085ec0bccSwdenkuse the "saveenv" command to store a valid environment.
2921c609719bSwdenk
29226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
2923fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
2924fc3e2165Swdenk
29256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
2926fc3e2165Swdenk		      also needs to be defined.
2927fc3e2165Swdenk
29286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
2929fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
2930c609719bSwdenk
2931f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
2932f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
2933f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
2934f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
2935f5675aa5SRon Madrid		space for already greatly restricted images, including but not
2936f5675aa5SRon Madrid		limited to NAND_SPL configurations.
2937f5675aa5SRon Madrid
2938c609719bSwdenkLow Level (hardware related) configuration options:
2939dc7c9a1aSwdenk---------------------------------------------------
2940c609719bSwdenk
29416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
2942c609719bSwdenk		Cache Line Size of the CPU.
2943c609719bSwdenk
29446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
2945c609719bSwdenk		Default address of the IMMR after system reset.
29462535d602Swdenk
29472535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
29482535d602Swdenk		and RPXsuper) to be able to adjust the position of
29492535d602Swdenk		the IMMR register after a reset.
2950c609719bSwdenk
2951e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
2952e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
2953e46fedfeSTimur Tabi		PowerPC SOCs.
2954e46fedfeSTimur Tabi
2955e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
2956e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
2957e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
2958e46fedfeSTimur Tabi
2959e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
2960e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
2961e46fedfeSTimur Tabi
2962e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
2963e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
2964e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
2965e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
2966e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
2967e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
2968e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
2969e46fedfeSTimur Tabi
2970e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
2971e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
2972e46fedfeSTimur Tabi
2973e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
2974e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
2975e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
2976e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
2977e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
2978e46fedfeSTimur Tabi
2979e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
2980e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
2981e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
2982e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
2983e46fedfeSTimur Tabi
2984e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
2985e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
2986e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
2987e46fedfeSTimur Tabi
29887f6c2cbcSwdenk- Floppy Disk Support:
29896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
29907f6c2cbcSwdenk
29917f6c2cbcSwdenk		the default drive number (default value 0)
29927f6c2cbcSwdenk
29936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
29947f6c2cbcSwdenk
299511ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
29967f6c2cbcSwdenk		(default value 1)
29977f6c2cbcSwdenk
29986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
29997f6c2cbcSwdenk
30007f6c2cbcSwdenk		defines the offset of register from address. It
30017f6c2cbcSwdenk		depends on which part of the data bus is connected to
300211ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
30037f6c2cbcSwdenk
30046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
30056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
30067f6c2cbcSwdenk		default value.
30077f6c2cbcSwdenk
30086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
30097f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
30107f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
30117f6c2cbcSwdenk		source code. It is used to make hardware dependant
30127f6c2cbcSwdenk		initializations.
30137f6c2cbcSwdenk
30140abddf82SMacpaul Lin- CONFIG_IDE_AHB:
30150abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
30160abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
30170abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
30180abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
30190abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
30200abddf82SMacpaul Lin		is requierd.
30210abddf82SMacpaul Lin
30226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
302325d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
302425d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
3025c609719bSwdenk
30266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
3027c609719bSwdenk
30287152b1d0Swdenk		Start address of memory area that can be used for
3029c609719bSwdenk		initial data and stack; please note that this must be
3030c609719bSwdenk		writable memory that is working WITHOUT special
3031c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
3032c609719bSwdenk		will become available only after programming the
3033c609719bSwdenk		memory controller and running certain initialization
3034c609719bSwdenk		sequences.
3035c609719bSwdenk
3036c609719bSwdenk		U-Boot uses the following memory types:
3037c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3038c609719bSwdenk		- MPC824X: data cache
3039c609719bSwdenk		- PPC4xx:  data cache
3040c609719bSwdenk
30416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
3042c609719bSwdenk
3043c609719bSwdenk		Offset of the initial data structure in the memory
30446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
30456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
3046c609719bSwdenk		data is located at the end of the available space
3047553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
30486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
30496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
30506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
3051c609719bSwdenk
3052c609719bSwdenk	Note:
3053c609719bSwdenk		On the MPC824X (or other systems that use the data
3054c609719bSwdenk		cache for initial memory) the address chosen for
30556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
3056c609719bSwdenk		point to an otherwise UNUSED address space between
3057c609719bSwdenk		the top of RAM and the start of the PCI space.
3058c609719bSwdenk
30596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
3060c609719bSwdenk
30616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
3062c609719bSwdenk
30636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
3064c609719bSwdenk
30656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
3066c609719bSwdenk
30676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
3068c609719bSwdenk
30696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
3070c609719bSwdenk
30716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
3072c609719bSwdenk		SDRAM timing
3073c609719bSwdenk
30746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
3075c609719bSwdenk		periodic timer for refresh
3076c609719bSwdenk
30776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
3078c609719bSwdenk
30796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
30806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
30816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
30826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
3083c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3084c609719bSwdenk
3085c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
30866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
30876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
3088c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3089c609719bSwdenk
30906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
30916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
3092c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
3093c609719bSwdenk		Prescaler definitions (SDRAM timing)
3094c609719bSwdenk
30956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
3096c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
3097c609719bSwdenk		define relocation offset in DPRAM [DSP2]
3098c609719bSwdenk
30996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
3100b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
3101b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
3102b423d055SHeiko Schocher
31036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
3104c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
3105c609719bSwdenk		define relocation offset in DPRAM [SCC4]
3106c609719bSwdenk
31076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
3108c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
3109c609719bSwdenk		wrong setting might damage your board. Read
3110c609719bSwdenk		doc/README.MBX before setting this variable!
3111c609719bSwdenk
31126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
3113ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
3114ea909b76Swdenk		(Power On Self Tests). This definition overrides
3115ea909b76Swdenk		#define'd default value in commproc.h resp.
3116ea909b76Swdenk		cpm_8260.h.
3117ea909b76Swdenk
31186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
31196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
31206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
31216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
31226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
31236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
31246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
31256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
3126a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
31275d232d0eSwdenk
31289cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
31299cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
31309cacf4fcSDirk Eibach		required.
31319cacf4fcSDirk Eibach
3132a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
3133a09b9b68SKumar Gala		Chip has SRIO or not
3134a09b9b68SKumar Gala
3135a09b9b68SKumar Gala- CONFIG_SRIO1:
3136a09b9b68SKumar Gala		Board has SRIO 1 port available
3137a09b9b68SKumar Gala
3138a09b9b68SKumar Gala- CONFIG_SRIO2:
3139a09b9b68SKumar Gala		Board has SRIO 2 port available
3140a09b9b68SKumar Gala
3141a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
3142a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
3143a09b9b68SKumar Gala
3144a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
3145a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
3146a09b9b68SKumar Gala
3147a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
3148a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
3149a09b9b68SKumar Gala
3150eced4626SAlex Waterman- CONFIG_SYS_NDFC_16
3151eced4626SAlex Waterman		Defined to tell the NDFC that the NAND chip is using a
3152eced4626SAlex Waterman		16 bit bus.
3153eced4626SAlex Waterman
3154eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
3155eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
3156eced4626SAlex Waterman		a default value will be used.
3157eced4626SAlex Waterman
3158bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
3159218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
3160218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
3161218ca724SWolfgang Denk
3162bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
3163bb99ad6dSBen Warren		I2C address of the SPD EEPROM
3164bb99ad6dSBen Warren
31656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
3166218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
3167218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
3168218ca724SWolfgang Denk		to something your driver can deal with.
3169bb99ad6dSBen Warren
31701b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
31711b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
31721b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
31731b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
31741b3e3c4fSYork Sun		header files or board specific files.
31751b3e3c4fSYork Sun
31766f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
31776f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
31786f5e1dc5SYork Sun
31796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
3180218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
3181218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
31822ad6b513STimur Tabi
3183c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
3184c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
3185c26e454dSwdenk
3186c26e454dSwdenk- CONFIG_FEC[12]_PHY
3187c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
31886e592385Swdenk		to the given FEC; i. e.
3189c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
3190c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
3191c26e454dSwdenk
3192c26e454dSwdenk		When set to -1, means to probe for first available.
3193c26e454dSwdenk
3194c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
3195c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
3196c26e454dSwdenk		(so program the FEC to ignore it).
3197c26e454dSwdenk
3198c26e454dSwdenk- CONFIG_RMII
3199c26e454dSwdenk		Enable RMII mode for all FECs.
3200c26e454dSwdenk		Note that this is a global option, we can't
3201c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
3202c26e454dSwdenk
32035cf91d6bSwdenk- CONFIG_CRC32_VERIFY
32045cf91d6bSwdenk		Add a verify option to the crc32 command.
32055cf91d6bSwdenk		The syntax is:
32065cf91d6bSwdenk
32075cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
32085cf91d6bSwdenk
32095cf91d6bSwdenk		Where address/count indicate a memory area
32105cf91d6bSwdenk		and crc32 is the correct crc32 which the
32115cf91d6bSwdenk		area should have.
32125cf91d6bSwdenk
321356523f12Swdenk- CONFIG_LOOPW
321456523f12Swdenk		Add the "loopw" memory command. This only takes effect if
3215602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
321656523f12Swdenk
32177b466641Sstroese- CONFIG_MX_CYCLIC
32187b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
32197b466641Sstroese		"md/mw" commands.
32207b466641Sstroese		Examples:
32217b466641Sstroese
32227b466641Sstroese		=> mdc.b 10 4 500
32237b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
32247b466641Sstroese
32257b466641Sstroese		=> mwc.l 100 12345678 10
32267b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
32277b466641Sstroese
32287b466641Sstroese		This only takes effect if the memory commands are activated
3229602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
32307b466641Sstroese
32318aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
3232afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
3233e03f3169SWolfgang Denk		low level initializations (like setting up the memory
3234e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
3235e03f3169SWolfgang Denk		relocate itself into RAM.
32368aa1a2d1Swdenk
3237e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
3238e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
3239e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
3240e03f3169SWolfgang Denk		these initializations itself.
32418aa1a2d1Swdenk
3242401bb30bSAneesh V- CONFIG_SPL_BUILD
3243df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
3244df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
3245df81238bSMagnus Lilja		compiling a NAND SPL.
3246400558b5Swdenk
3247d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
3248d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
3249d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
3250d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
3251d8834a13SMatthias Weisser		conditions but may increase the binary size.
3252d8834a13SMatthias Weisser
3253c609719bSwdenkBuilding the Software:
3254c609719bSwdenk======================
3255c609719bSwdenk
3256218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
3257218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
3258218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
3259218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
3260218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
3261218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
3262c609719bSwdenk
3263218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
3264218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
3265218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
3266218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
3267218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
3268c609719bSwdenk
3269218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
3270218ca724SWolfgang Denk	$ export CROSS_COMPILE
3271c609719bSwdenk
32722f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
32732f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
32742f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
32752f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
32762f8d396bSPeter Tyser
32772f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
32782f8d396bSPeter Tyser
32792f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
32802f8d396bSPeter Tyser      be executed on computers running Windows.
32812f8d396bSPeter Tyser
3282c609719bSwdenkU-Boot is intended to be simple to build. After installing the
3283c609719bSwdenksources you must configure U-Boot for one specific board type. This
3284c609719bSwdenkis done by typing:
3285c609719bSwdenk
3286c609719bSwdenk	make NAME_config
3287c609719bSwdenk
3288218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
3289218ca724SWolfgang Denkrations; see the main Makefile for supported names.
329054387ac9Swdenk
3291c609719bSwdenkNote: for some board special configuration names may exist; check if
3292c609719bSwdenk      additional information is available from the board vendor; for
32932729af9dSwdenk      instance, the TQM823L systems are available without (standard)
32942729af9dSwdenk      or with LCD support. You can select such additional "features"
329511ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
3296c609719bSwdenk
32972729af9dSwdenk      make TQM823L_config
32982729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
3299c609719bSwdenk
3300c609719bSwdenk      make TQM823L_LCD_config
3301c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
3302c609719bSwdenk
3303c609719bSwdenk      etc.
3304c609719bSwdenk
3305c609719bSwdenk
3306c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
33077152b1d0Swdenkimages ready for download to / installation on your system:
3308c609719bSwdenk
3309c609719bSwdenk- "u-boot.bin" is a raw binary image
3310c609719bSwdenk- "u-boot" is an image in ELF binary format
3311c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
3312c609719bSwdenk
3313baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
3314baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
3315baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
3316baf31249SMarian Balakowicz
3317baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
3318baf31249SMarian Balakowicz
3319baf31249SMarian Balakowicz	make O=/tmp/build distclean
3320baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
3321baf31249SMarian Balakowicz	make O=/tmp/build all
3322baf31249SMarian Balakowicz
3323baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
3324baf31249SMarian Balakowicz
3325baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3326baf31249SMarian Balakowicz	make distclean
3327baf31249SMarian Balakowicz	make NAME_config
3328baf31249SMarian Balakowicz	make all
3329baf31249SMarian Balakowicz
3330baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
3331baf31249SMarian Balakowiczvariable.
3332baf31249SMarian Balakowicz
3333c609719bSwdenk
3334c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
3335c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
3336c609719bSwdenknative "make".
3337c609719bSwdenk
3338c609719bSwdenk
3339c609719bSwdenkIf the system board that you have is not listed, then you will need
3340c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
3341c609719bSwdenksteps:
3342c609719bSwdenk
3343c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
334485ec0bccSwdenk    "Makefile" and to the "MAKEALL" script, using the existing
334585ec0bccSwdenk    entries as examples. Note that here and at many other places
33467152b1d0Swdenk    boards and other names are listed in alphabetical sort order. Please
334785ec0bccSwdenk    keep this order.
3348c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
334985ec0bccSwdenk    files you need. In your board directory, you will need at least
335085ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
335185ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
335285ec0bccSwdenk    your board
3353c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
3354c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
335585ec0bccSwdenk4.  Run "make <board>_config" with your new name.
3356c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
3357c609719bSwdenk    to be installed on your target system.
335885ec0bccSwdenk6.  Debug and solve any problems that might arise.
3359c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
3360c609719bSwdenk
3361c609719bSwdenk
3362c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
3363c609719bSwdenk==============================================================
3364c609719bSwdenk
3365c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
3366c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
3367c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
3368c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
3369218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
3370c609719bSwdenk
3371c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
3372c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
3373c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
3374c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
3375c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
33767152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
3377218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
3378218ca724SWolfgang Denkyou can type
3379c609719bSwdenk
3380c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
3381c609719bSwdenk
3382c609719bSwdenkor to build on a native PowerPC system you can type
3383c609719bSwdenk
3384c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
3385c609719bSwdenk
3386218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
3387218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
3388218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
3389218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
3390218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
3391218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
3392218ca724SWolfgang Denkvariable. For example:
3393baf31249SMarian Balakowicz
3394baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
3395baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
3396baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
3397baf31249SMarian Balakowicz
3398218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
3399218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
3400218ca724SWolfgang Denkduring the whole build process.
3401baf31249SMarian Balakowicz
3402baf31249SMarian Balakowicz
3403c609719bSwdenkSee also "U-Boot Porting Guide" below.
3404c609719bSwdenk
3405c609719bSwdenk
3406c609719bSwdenkMonitor Commands - Overview:
3407c609719bSwdenk============================
3408c609719bSwdenk
3409c609719bSwdenkgo	- start application at address 'addr'
3410c609719bSwdenkrun	- run commands in an environment variable
3411c609719bSwdenkbootm	- boot application image from memory
3412c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
3413c609719bSwdenktftpboot- boot image via network using TFTP protocol
3414c609719bSwdenk	       and env variables "ipaddr" and "serverip"
3415c609719bSwdenk	       (and eventually "gatewayip")
34161fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
3417c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
3418c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
3419c609719bSwdenkloads	- load S-Record file over serial line
3420c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
3421c609719bSwdenkmd	- memory display
3422c609719bSwdenkmm	- memory modify (auto-incrementing)
3423c609719bSwdenknm	- memory modify (constant address)
3424c609719bSwdenkmw	- memory write (fill)
3425c609719bSwdenkcp	- memory copy
3426c609719bSwdenkcmp	- memory compare
3427c609719bSwdenkcrc32	- checksum calculation
34280f89c54bSPeter Tyseri2c	- I2C sub-system
3429c609719bSwdenksspi	- SPI utility commands
3430c609719bSwdenkbase	- print or set address offset
3431c609719bSwdenkprintenv- print environment variables
3432c609719bSwdenksetenv	- set environment variables
3433c609719bSwdenksaveenv - save environment variables to persistent storage
3434c609719bSwdenkprotect - enable or disable FLASH write protection
3435c609719bSwdenkerase	- erase FLASH memory
3436c609719bSwdenkflinfo	- print FLASH memory information
3437c609719bSwdenkbdinfo	- print Board Info structure
3438c609719bSwdenkiminfo	- print header information for application image
3439c609719bSwdenkconinfo - print console devices and informations
3440c609719bSwdenkide	- IDE sub-system
3441c609719bSwdenkloop	- infinite loop on address range
344256523f12Swdenkloopw	- infinite write loop on address range
3443c609719bSwdenkmtest	- simple RAM test
3444c609719bSwdenkicache	- enable or disable instruction cache
3445c609719bSwdenkdcache	- enable or disable data cache
3446c609719bSwdenkreset	- Perform RESET of the CPU
3447c609719bSwdenkecho	- echo args to console
3448c609719bSwdenkversion - print monitor version
3449c609719bSwdenkhelp	- print online help
3450c609719bSwdenk?	- alias for 'help'
3451c609719bSwdenk
3452c609719bSwdenk
3453c609719bSwdenkMonitor Commands - Detailed Description:
3454c609719bSwdenk========================================
3455c609719bSwdenk
3456c609719bSwdenkTODO.
3457c609719bSwdenk
3458c609719bSwdenkFor now: just type "help <command>".
3459c609719bSwdenk
3460c609719bSwdenk
3461c609719bSwdenkEnvironment Variables:
3462c609719bSwdenk======================
3463c609719bSwdenk
3464c609719bSwdenkU-Boot supports user configuration using Environment Variables which
3465c609719bSwdenkcan be made persistent by saving to Flash memory.
3466c609719bSwdenk
3467c609719bSwdenkEnvironment Variables are set using "setenv", printed using
3468c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
3469c609719bSwdenkwithout a value can be used to delete a variable from the
3470c609719bSwdenkenvironment. As long as you don't save the environment you are
3471c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
3472c609719bSwdenkenvironment is erased by accident, a default environment is provided.
3473c609719bSwdenk
3474c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
3475c96f86eeSWolfgang Denk
3476c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
3477c609719bSwdenk
3478c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
3479c609719bSwdenk
3480c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
3481c609719bSwdenk
3482c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
3483c609719bSwdenk
3484c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
3485c609719bSwdenk
3486c609719bSwdenk  bootfile	- Name of the image to load with TFTP
3487c609719bSwdenk
34887d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
34897d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
34907d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
34917d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
34927d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
34937d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
3494c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
3495c3624e6eSGrant Likely		  bootm_mapsize.
3496c3624e6eSGrant Likely
3497c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
3498c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
3499c3624e6eSGrant Likely		  defines the size of the memory region starting at base
3500c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
3501c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
3502c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
3503c3624e6eSGrant Likely		  used otherwise.
35047d721e34SBartlomiej Sieka
35057d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
35067d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
35077d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
35087d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
35097d721e34SBartlomiej Sieka		  environment variable.
35107d721e34SBartlomiej Sieka
35114bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
35124bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
35134bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
35144bae9090SBartlomiej Sieka
3515c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
3516c609719bSwdenk		  "bootp" will just load perform a lookup of the
3517c609719bSwdenk		  configuration from the BOOTP server, but not try to
3518c609719bSwdenk		  load any image using TFTP
3519c609719bSwdenk
3520c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
3521c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
3522c609719bSwdenk		  be automatically started (by internally calling
3523c609719bSwdenk		  "bootm")
3524c609719bSwdenk
35254a6fd34bSwdenk		  If set to "no", a standalone image passed to the
35264a6fd34bSwdenk		  "bootm" command will be copied to the load address
35274a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
35284a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
35294a6fd34bSwdenk		  data.
35304a6fd34bSwdenk
3531a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
3532a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
3533a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
3534a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
3535a28afca5SDavid A. Long		  to work it must reside in writable memory, have
3536a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
3537a28afca5SDavid A. Long		  add the information it needs into it, and the memory
3538a28afca5SDavid A. Long		  must be accessible by the kernel.
3539a28afca5SDavid A. Long
3540eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
3541eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
3542eea63e05SSimon Glass		  defined.
3543eea63e05SSimon Glass
354417ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
354517ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
354617ea1177Swdenk		  mode (400kHZ). This environment variable is used in
354717ea1177Swdenk		  initialization code. So, for changes to be effective
354817ea1177Swdenk		  it must be saved and board must be reset.
354917ea1177Swdenk
3550c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
3551c609719bSwdenk		  If this variable is not set, initrd images will be
3552c609719bSwdenk		  copied to the highest possible address in RAM; this
3553c609719bSwdenk		  is usually what you want since it allows for
3554c609719bSwdenk		  maximum initrd size. If for some reason you want to
3555c609719bSwdenk		  make sure that the initrd image is loaded below the
35566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
3557c609719bSwdenk		  variable to a value of "no" or "off" or "0".
3558c609719bSwdenk		  Alternatively, you can set it to a maximum upper
3559c609719bSwdenk		  address to use (U-Boot will still check that it
3560c609719bSwdenk		  does not overwrite the U-Boot stack and data).
3561c609719bSwdenk
3562c609719bSwdenk		  For instance, when you have a system with 16 MB
35637152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
3564c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
3565c609719bSwdenk		  the "bootargs" variable. However, now you must make
35667152b1d0Swdenk		  sure that the initrd image is placed in the first
3567c609719bSwdenk		  12 MB as well - this can be done with
3568c609719bSwdenk
3569c609719bSwdenk		  setenv initrd_high 00c00000
3570c609719bSwdenk
357138b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
357238b99261Swdenk		  indication to U-Boot that all addresses are legal
357338b99261Swdenk		  for the Linux kernel, including addresses in flash
357438b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
357538b99261Swdenk		  ramdisk at all. This may be useful to reduce the
357638b99261Swdenk		  boot time on your system, but requires that this
357738b99261Swdenk		  feature is supported by your Linux kernel.
357838b99261Swdenk
3579c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
3580c609719bSwdenk
3581c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
3582dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
3583c609719bSwdenk
3584c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
3585c609719bSwdenk
3586c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
3587c609719bSwdenk
3588c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
3589c609719bSwdenk
3590c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
3591c609719bSwdenk
3592c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
3593c609719bSwdenk
3594e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
3595a3d991bdSwdenk
3596e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
3597e2a53458SMike Frysinger		  For example you can do the following
3598a3d991bdSwdenk
359948690d80SHeiko Schocher		  => setenv ethact FEC
360048690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
360148690d80SHeiko Schocher		  => setenv ethact SCC
360248690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
3603a3d991bdSwdenk
3604e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
3605e1692577SMatthias Fuchs		  available network interfaces.
3606e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
3607e1692577SMatthias Fuchs
3608a3d991bdSwdenk  netretry	- When set to "no" each network operation will
3609a3d991bdSwdenk		  either succeed or fail without retrying.
36106e592385Swdenk		  When set to "once" the network operation will
36116e592385Swdenk		  fail when all the available network interfaces
36126e592385Swdenk		  are tried once without success.
3613a3d991bdSwdenk		  Useful on scripts which control the retry operation
3614a3d991bdSwdenk		  themselves.
3615a3d991bdSwdenk
3616b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
3617a1cf027aSJean-Christophe PLAGNIOL-VILLARD
361828cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
3619ecb0ccd9SWolfgang Denk		  UDP source port.
3620ecb0ccd9SWolfgang Denk
362128cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
362228cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
362328cb9375SWolfgang Denk
3624c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
3625c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
3626c96f86eeSWolfgang Denk
3627c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
3628c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
3629c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
3630c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
3631c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
3632c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
3633c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
3634c96f86eeSWolfgang Denk
3635a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
363611ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
3637a3d991bdSwdenk		  VLAN tagged frames.
3638c609719bSwdenk
3639dc0b7b0eSJason HobbsThe following image location variables contain the location of images
3640dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
3641dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
3642dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
3643dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
3644dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
3645dc0b7b0eSJason Hobbsflash or offset in NAND flash.
3646dc0b7b0eSJason Hobbs
3647dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
3648dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
3649dc0b7b0eSJason Hobbsboards use these variables for other purposes.
3650dc0b7b0eSJason Hobbs
3651dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
3652dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
3653dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
3654dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
3655dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
3656dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
3657dc0b7b0eSJason Hobbs
3658c609719bSwdenkThe following environment variables may be used and automatically
3659c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
3660c609719bSwdenkdepending the information provided by your boot server:
3661c609719bSwdenk
3662c609719bSwdenk  bootfile	- see above
3663c609719bSwdenk  dnsip		- IP address of your Domain Name Server
3664fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
3665c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
3666c609719bSwdenk  hostname	- Target hostname
3667c609719bSwdenk  ipaddr	- see above
3668c609719bSwdenk  netmask	- Subnet Mask
3669c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
3670c609719bSwdenk  serverip	- see above
3671c609719bSwdenk
3672c609719bSwdenk
3673c609719bSwdenkThere are two special Environment Variables:
3674c609719bSwdenk
3675c609719bSwdenk  serial#	- contains hardware identification information such
3676c609719bSwdenk		  as type string and/or serial number
3677c609719bSwdenk  ethaddr	- Ethernet address
3678c609719bSwdenk
3679c609719bSwdenkThese variables can be set only once (usually during manufacturing of
3680c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
3681c609719bSwdenkonce they have been set once.
3682c609719bSwdenk
3683c609719bSwdenk
3684c1551ea8SstroeseFurther special Environment Variables:
3685c1551ea8Sstroese
3686c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
3687c1551ea8Sstroese		  with the "version" command. This variable is
3688c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
3689c1551ea8Sstroese
3690c1551ea8Sstroese
3691c609719bSwdenkPlease note that changes to some configuration parameters may take
3692c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
3693c609719bSwdenk
3694c609719bSwdenk
3695f07771ccSwdenkCommand Line Parsing:
3696f07771ccSwdenk=====================
3697f07771ccSwdenk
3698f07771ccSwdenkThere are two different command line parsers available with U-Boot:
36997152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
3700f07771ccSwdenk
3701f07771ccSwdenkOld, simple command line parser:
3702f07771ccSwdenk--------------------------------
3703f07771ccSwdenk
3704f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
3705f07771ccSwdenk- several commands on one line, separated by ';'
3706fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
3707f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
3708f07771ccSwdenk  for example:
3709fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
3710f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
3711f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
3712f07771ccSwdenk
3713f07771ccSwdenkHush shell:
3714f07771ccSwdenk-----------
3715f07771ccSwdenk
3716f07771ccSwdenk- similar to Bourne shell, with control structures like
3717f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
3718f07771ccSwdenk  until...do...done, ...
3719f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
3720f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
3721f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
3722f07771ccSwdenk  command
3723f07771ccSwdenk
3724f07771ccSwdenkGeneral rules:
3725f07771ccSwdenk--------------
3726f07771ccSwdenk
3727f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
3728f07771ccSwdenk    command) contains several commands separated by semicolon, and
3729f07771ccSwdenk    one of these commands fails, then the remaining commands will be
3730f07771ccSwdenk    executed anyway.
3731f07771ccSwdenk
3732f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
373311ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
3734f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
3735f07771ccSwdenk    variables are not executed.
3736f07771ccSwdenk
3737c609719bSwdenkNote for Redundant Ethernet Interfaces:
3738c609719bSwdenk=======================================
3739c609719bSwdenk
374011ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
3741c609719bSwdenksuch configurations and is capable of automatic selection of a
37427152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
3743c609719bSwdenk
3744c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
3745c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
3746c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
3747c609719bSwdenk
3748c609719bSwdenkIf the network interface stores some valid MAC address (for instance
3749c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
3750c609719bSwdenkding setting in the environment; if the corresponding environment
3751c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
3752c609719bSwdenk
3753c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
3754c609719bSwdenk  environment, the SROM's address is used.
3755c609719bSwdenk
3756c609719bSwdenko If there is no valid address in the SROM, and a definition in the
3757c609719bSwdenk  environment exists, then the value from the environment variable is
3758c609719bSwdenk  used.
3759c609719bSwdenk
3760c609719bSwdenko If both the SROM and the environment contain a MAC address, and
3761c609719bSwdenk  both addresses are the same, this MAC address is used.
3762c609719bSwdenk
3763c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
3764c609719bSwdenk  addresses differ, the value from the environment is used and a
3765c609719bSwdenk  warning is printed.
3766c609719bSwdenk
3767c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
3768c609719bSwdenk  is raised.
3769c609719bSwdenk
3770ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
3771ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
3772ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
3773ecee9324SBen WarrenThe naming convention is as follows:
3774ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
3775c609719bSwdenk
3776c609719bSwdenkImage Formats:
3777c609719bSwdenk==============
3778c609719bSwdenk
37793310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
37803310c549SMarian Balakowiczimages in two formats:
37813310c549SMarian Balakowicz
37823310c549SMarian BalakowiczNew uImage format (FIT)
37833310c549SMarian Balakowicz-----------------------
37843310c549SMarian Balakowicz
37853310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
37863310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
37873310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
37883310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
37893310c549SMarian Balakowicz
37903310c549SMarian Balakowicz
37913310c549SMarian BalakowiczOld uImage format
37923310c549SMarian Balakowicz-----------------
37933310c549SMarian Balakowicz
37943310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
37953310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
37963310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
3797c609719bSwdenk
3798c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
3799c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
3800f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
3801f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
3802f5ed9e39SPeter Tyser  INTEGRITY).
38037b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
3804afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
3805afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
3806c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
3807c609719bSwdenk* Load Address
3808c609719bSwdenk* Entry Point
3809c609719bSwdenk* Image Name
3810c609719bSwdenk* Image Timestamp
3811c609719bSwdenk
3812c609719bSwdenkThe header is marked by a special Magic Number, and both the header
3813c609719bSwdenkand the data portions of the image are secured against corruption by
3814c609719bSwdenkCRC32 checksums.
3815c609719bSwdenk
3816c609719bSwdenk
3817c609719bSwdenkLinux Support:
3818c609719bSwdenk==============
3819c609719bSwdenk
3820c609719bSwdenkAlthough U-Boot should support any OS or standalone application
38217152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
3822c609719bSwdenkU-Boot.
3823c609719bSwdenk
3824c609719bSwdenkU-Boot includes many features that so far have been part of some
3825c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
3826c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
3827c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
38287152b1d0Swdenkserves several purposes:
3829c609719bSwdenk
3830c609719bSwdenk- the same features can be used for other OS or standalone
3831c609719bSwdenk  applications (for instance: using compressed images to reduce the
3832c609719bSwdenk  Flash memory footprint)
3833c609719bSwdenk
3834c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
38357152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
3836c609719bSwdenk
3837c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
3838c609719bSwdenk  images; of course this also means that different kernel images can
3839c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
3840c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
3841c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
3842c609719bSwdenk  software is easier now.
3843c609719bSwdenk
3844c609719bSwdenk
3845c609719bSwdenkLinux HOWTO:
3846c609719bSwdenk============
3847c609719bSwdenk
3848c609719bSwdenkPorting Linux to U-Boot based systems:
3849c609719bSwdenk---------------------------------------
3850c609719bSwdenk
3851c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
3852c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
3853c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
3854c609719bSwdenkLinux :-).
3855c609719bSwdenk
3856a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
3857c609719bSwdenk
3858c609719bSwdenkJust make sure your machine specific header file (for instance
3859c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
38601dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
38611dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
38626d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
3863c609719bSwdenk
3864c609719bSwdenk
3865c609719bSwdenkConfiguring the Linux kernel:
3866c609719bSwdenk-----------------------------
3867c609719bSwdenk
3868c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
3869c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
3870c609719bSwdenk
3871c609719bSwdenk
3872c609719bSwdenkBuilding a Linux Image:
3873c609719bSwdenk-----------------------
3874c609719bSwdenk
387524ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
387624ee89b9Swdenknot used. If you use recent kernel source, a new build target
387724ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
387824ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
387924ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
388024ee89b9Swdenk100% compatible format.
3881c609719bSwdenk
3882c609719bSwdenkExample:
3883c609719bSwdenk
3884c609719bSwdenk	make TQM850L_config
3885c609719bSwdenk	make oldconfig
3886c609719bSwdenk	make dep
388724ee89b9Swdenk	make uImage
3888c609719bSwdenk
388924ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
389024ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
389124ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
3892c609719bSwdenk
389324ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
389424ee89b9Swdenk
389524ee89b9Swdenk* convert the kernel into a raw binary image:
389624ee89b9Swdenk
389724ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
389824ee89b9Swdenk				 -R .note -R .comment \
389924ee89b9Swdenk				 -S vmlinux linux.bin
390024ee89b9Swdenk
390124ee89b9Swdenk* compress the binary image:
390224ee89b9Swdenk
390324ee89b9Swdenk	gzip -9 linux.bin
390424ee89b9Swdenk
390524ee89b9Swdenk* package compressed binary image for U-Boot:
390624ee89b9Swdenk
390724ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
390824ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
390924ee89b9Swdenk		-d linux.bin.gz uImage
391024ee89b9Swdenk
391124ee89b9Swdenk
391224ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
391324ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
391424ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
391524ee89b9Swdenkbyte header containing information about target architecture,
391624ee89b9Swdenkoperating system, image type, compression method, entry points, time
391724ee89b9Swdenkstamp, CRC32 checksums, etc.
391824ee89b9Swdenk
391924ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
392024ee89b9Swdenkprint the header information, or to build new images.
3921c609719bSwdenk
3922c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
3923c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
3924c609719bSwdenkchecksum verification:
3925c609719bSwdenk
3926c609719bSwdenk	tools/mkimage -l image
3927c609719bSwdenk	  -l ==> list image header information
3928c609719bSwdenk
3929c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
3930c609719bSwdenkfrom a "data file" which is used as image payload:
3931c609719bSwdenk
3932c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
3933c609719bSwdenk		      -n name -d data_file image
3934c609719bSwdenk	  -A ==> set architecture to 'arch'
3935c609719bSwdenk	  -O ==> set operating system to 'os'
3936c609719bSwdenk	  -T ==> set image type to 'type'
3937c609719bSwdenk	  -C ==> set compression type 'comp'
3938c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
3939c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
3940c609719bSwdenk	  -n ==> set image name to 'name'
3941c609719bSwdenk	  -d ==> use image data from 'datafile'
3942c609719bSwdenk
394369459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
394469459791Swdenkaddress (0x00000000), but the entry point address depends on the
394569459791Swdenkkernel version:
3946c609719bSwdenk
3947c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
394824ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
3949c609719bSwdenk
3950c609719bSwdenkSo a typical call to build a U-Boot image would read:
3951c609719bSwdenk
395224ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
395324ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
3954a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
395524ee89b9Swdenk	> examples/uImage.TQM850L
395624ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3957c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3958c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3959c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3960c609719bSwdenk	Load Address: 0x00000000
396124ee89b9Swdenk	Entry Point:  0x00000000
3962c609719bSwdenk
3963c609719bSwdenkTo verify the contents of the image (or check for corruption):
3964c609719bSwdenk
396524ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
396624ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3967c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3968c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
3969c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
3970c609719bSwdenk	Load Address: 0x00000000
397124ee89b9Swdenk	Entry Point:  0x00000000
3972c609719bSwdenk
3973c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
3974c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
3975c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
3976c609719bSwdenkneed to be uncompressed:
3977c609719bSwdenk
3978a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
397924ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
398024ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
3981a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
398224ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
398324ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
3984c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
3985c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
3986c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
3987c609719bSwdenk	Load Address: 0x00000000
398824ee89b9Swdenk	Entry Point:  0x00000000
3989c609719bSwdenk
3990c609719bSwdenk
3991c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
3992c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
3993c609719bSwdenk
3994c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
3995c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
3996c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
3997c609719bSwdenk	Image Name:   Simple Ramdisk Image
3998c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
3999c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
4000c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
4001c609719bSwdenk	Load Address: 0x00000000
4002c609719bSwdenk	Entry Point:  0x00000000
4003c609719bSwdenk
4004c609719bSwdenk
4005c609719bSwdenkInstalling a Linux Image:
4006c609719bSwdenk-------------------------
4007c609719bSwdenk
4008c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
4009c609719bSwdenkyou must convert the image to S-Record format:
4010c609719bSwdenk
4011c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
4012c609719bSwdenk
4013c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
4014c609719bSwdenkimage header, so the resulting S-Record file will be relative to
4015c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
4016c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
4017c609719bSwdenkcommand.
4018c609719bSwdenk
4019c609719bSwdenkExample: install the image to address 0x40100000 (which on the
4020c609719bSwdenkTQM8xxL is in the first Flash bank):
4021c609719bSwdenk
4022c609719bSwdenk	=> erase 40100000 401FFFFF
4023c609719bSwdenk
4024c609719bSwdenk	.......... done
4025c609719bSwdenk	Erased 8 sectors
4026c609719bSwdenk
4027c609719bSwdenk	=> loads 40100000
4028c609719bSwdenk	## Ready for S-Record download ...
4029c609719bSwdenk	~>examples/image.srec
4030c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
4031c609719bSwdenk	...
4032c609719bSwdenk	15989 15990 15991 15992
4033c609719bSwdenk	[file transfer complete]
4034c609719bSwdenk	[connected]
4035c609719bSwdenk	## Start Addr = 0x00000000
4036c609719bSwdenk
4037c609719bSwdenk
4038c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
4039c609719bSwdenkthis includes a checksum verification so you can be sure no data
4040c609719bSwdenkcorruption happened:
4041c609719bSwdenk
4042c609719bSwdenk	=> imi 40100000
4043c609719bSwdenk
4044c609719bSwdenk	## Checking Image at 40100000 ...
4045c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4046c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4047c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4048c609719bSwdenk	   Load Address: 00000000
4049c609719bSwdenk	   Entry Point:	 0000000c
4050c609719bSwdenk	   Verifying Checksum ... OK
4051c609719bSwdenk
4052c609719bSwdenk
4053c609719bSwdenkBoot Linux:
4054c609719bSwdenk-----------
4055c609719bSwdenk
4056c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
4057c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
4058c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
4059c609719bSwdenkparameters. You can check and modify this variable using the
4060c609719bSwdenk"printenv" and "setenv" commands:
4061c609719bSwdenk
4062c609719bSwdenk
4063c609719bSwdenk	=> printenv bootargs
4064c609719bSwdenk	bootargs=root=/dev/ram
4065c609719bSwdenk
4066c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4067c609719bSwdenk
4068c609719bSwdenk	=> printenv bootargs
4069c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4070c609719bSwdenk
4071c609719bSwdenk	=> bootm 40020000
4072c609719bSwdenk	## Booting Linux kernel at 40020000 ...
4073c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
4074c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4075c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
4076c609719bSwdenk	   Load Address: 00000000
4077c609719bSwdenk	   Entry Point:	 0000000c
4078c609719bSwdenk	   Verifying Checksum ... OK
4079c609719bSwdenk	   Uncompressing Kernel Image ... OK
4080c609719bSwdenk	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
4081c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4082c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4083c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4084c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
4085c609719bSwdenk	...
4086c609719bSwdenk
408711ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
40887152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
4089c609719bSwdenkformat!) to the "bootm" command:
4090c609719bSwdenk
4091c609719bSwdenk	=> imi 40100000 40200000
4092c609719bSwdenk
4093c609719bSwdenk	## Checking Image at 40100000 ...
4094c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4095c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4096c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4097c609719bSwdenk	   Load Address: 00000000
4098c609719bSwdenk	   Entry Point:	 0000000c
4099c609719bSwdenk	   Verifying Checksum ... OK
4100c609719bSwdenk
4101c609719bSwdenk	## Checking Image at 40200000 ...
4102c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4103c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4104c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4105c609719bSwdenk	   Load Address: 00000000
4106c609719bSwdenk	   Entry Point:	 00000000
4107c609719bSwdenk	   Verifying Checksum ... OK
4108c609719bSwdenk
4109c609719bSwdenk	=> bootm 40100000 40200000
4110c609719bSwdenk	## Booting Linux kernel at 40100000 ...
4111c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4112c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4113c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4114c609719bSwdenk	   Load Address: 00000000
4115c609719bSwdenk	   Entry Point:	 0000000c
4116c609719bSwdenk	   Verifying Checksum ... OK
4117c609719bSwdenk	   Uncompressing Kernel Image ... OK
4118c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
4119c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4120c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4121c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4122c609719bSwdenk	   Load Address: 00000000
4123c609719bSwdenk	   Entry Point:	 00000000
4124c609719bSwdenk	   Verifying Checksum ... OK
4125c609719bSwdenk	   Loading Ramdisk ... OK
4126c609719bSwdenk	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
4127c609719bSwdenk	Boot arguments: root=/dev/ram
4128c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4129c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4130c609719bSwdenk	...
4131c609719bSwdenk	RAMDISK: Compressed image found at block 0
4132c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
4133c609719bSwdenk
4134c609719bSwdenk	bash#
4135c609719bSwdenk
41360267768eSMatthew McClintockBoot Linux and pass a flat device tree:
41370267768eSMatthew McClintock-----------
41380267768eSMatthew McClintock
41390267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
41400267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
41410267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
41420267768eSMatthew McClintockflat device tree:
41430267768eSMatthew McClintock
41440267768eSMatthew McClintock=> print oftaddr
41450267768eSMatthew McClintockoftaddr=0x300000
41460267768eSMatthew McClintock=> print oft
41470267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
41480267768eSMatthew McClintock=> tftp $oftaddr $oft
41490267768eSMatthew McClintockSpeed: 1000, full duplex
41500267768eSMatthew McClintockUsing TSEC0 device
41510267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
41520267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
41530267768eSMatthew McClintockLoad address: 0x300000
41540267768eSMatthew McClintockLoading: #
41550267768eSMatthew McClintockdone
41560267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
41570267768eSMatthew McClintock=> tftp $loadaddr $bootfile
41580267768eSMatthew McClintockSpeed: 1000, full duplex
41590267768eSMatthew McClintockUsing TSEC0 device
41600267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
41610267768eSMatthew McClintockFilename 'uImage'.
41620267768eSMatthew McClintockLoad address: 0x200000
41630267768eSMatthew McClintockLoading:############
41640267768eSMatthew McClintockdone
41650267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
41660267768eSMatthew McClintock=> print loadaddr
41670267768eSMatthew McClintockloadaddr=200000
41680267768eSMatthew McClintock=> print oftaddr
41690267768eSMatthew McClintockoftaddr=0x300000
41700267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
41710267768eSMatthew McClintock## Booting image at 00200000 ...
41720267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
41730267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
41740267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
41750267768eSMatthew McClintock   Load Address: 00000000
41760267768eSMatthew McClintock   Entry Point:	 00000000
41770267768eSMatthew McClintock   Verifying Checksum ... OK
41780267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
41790267768eSMatthew McClintockBooting using flat device tree at 0x300000
41800267768eSMatthew McClintockUsing MPC85xx ADS machine description
41810267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
41820267768eSMatthew McClintock[snip]
41830267768eSMatthew McClintock
41840267768eSMatthew McClintock
41856069ff26SwdenkMore About U-Boot Image Types:
41866069ff26Swdenk------------------------------
41876069ff26Swdenk
41886069ff26SwdenkU-Boot supports the following image types:
41896069ff26Swdenk
41906069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
41916069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
41926069ff26Swdenk	well) you can continue to work in U-Boot after return from
41936069ff26Swdenk	the Standalone Program.
41946069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
41956069ff26Swdenk	will take over control completely. Usually these programs
41966069ff26Swdenk	will install their own set of exception handlers, device
41976069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
41986069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
41996069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
42006069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
42016069ff26Swdenk	being started.
42026069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
42036069ff26Swdenk	(Linux) kernel image and one or more data images like
42046069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
42056069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
42066069ff26Swdenk	server provides just a single image file, but you want to get
42076069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
42086069ff26Swdenk
42096069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
42106069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
42116069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
42126069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
42136069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
42146069ff26Swdenk	a multiple of 4 bytes).
42156069ff26Swdenk
42166069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
42176069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
42186069ff26Swdenk	flash memory.
42196069ff26Swdenk
42206069ff26Swdenk   "Script files" are command sequences that will be executed by
42216069ff26Swdenk	U-Boot's command interpreter; this feature is especially
42226069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
42236069ff26Swdenk	as command interpreter.
42246069ff26Swdenk
4225c609719bSwdenk
4226c609719bSwdenkStandalone HOWTO:
4227c609719bSwdenk=================
4228c609719bSwdenk
4229c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
4230c609719bSwdenkrun "standalone" applications, which can use some resources of
4231c609719bSwdenkU-Boot like console I/O functions or interrupt services.
4232c609719bSwdenk
4233c609719bSwdenkTwo simple examples are included with the sources:
4234c609719bSwdenk
4235c609719bSwdenk"Hello World" Demo:
4236c609719bSwdenk-------------------
4237c609719bSwdenk
4238c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
4239c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
4240c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
4241c609719bSwdenklike that:
4242c609719bSwdenk
4243c609719bSwdenk	=> loads
4244c609719bSwdenk	## Ready for S-Record download ...
4245c609719bSwdenk	~>examples/hello_world.srec
4246c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4247c609719bSwdenk	[file transfer complete]
4248c609719bSwdenk	[connected]
4249c609719bSwdenk	## Start Addr = 0x00040004
4250c609719bSwdenk
4251c609719bSwdenk	=> go 40004 Hello World! This is a test.
4252c609719bSwdenk	## Starting application at 0x00040004 ...
4253c609719bSwdenk	Hello World
4254c609719bSwdenk	argc = 7
4255c609719bSwdenk	argv[0] = "40004"
4256c609719bSwdenk	argv[1] = "Hello"
4257c609719bSwdenk	argv[2] = "World!"
4258c609719bSwdenk	argv[3] = "This"
4259c609719bSwdenk	argv[4] = "is"
4260c609719bSwdenk	argv[5] = "a"
4261c609719bSwdenk	argv[6] = "test."
4262c609719bSwdenk	argv[7] = "<NULL>"
4263c609719bSwdenk	Hit any key to exit ...
4264c609719bSwdenk
4265c609719bSwdenk	## Application terminated, rc = 0x0
4266c609719bSwdenk
4267c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
4268c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
4269c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
4270c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
4271c609719bSwdenkcharacter, but this is just a demo program. The application can be
4272c609719bSwdenkcontrolled by the following keys:
4273c609719bSwdenk
4274c609719bSwdenk	? - print current values og the CPM Timer registers
4275c609719bSwdenk	b - enable interrupts and start timer
4276c609719bSwdenk	e - stop timer and disable interrupts
4277c609719bSwdenk	q - quit application
4278c609719bSwdenk
4279c609719bSwdenk	=> loads
4280c609719bSwdenk	## Ready for S-Record download ...
4281c609719bSwdenk	~>examples/timer.srec
4282c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
4283c609719bSwdenk	[file transfer complete]
4284c609719bSwdenk	[connected]
4285c609719bSwdenk	## Start Addr = 0x00040004
4286c609719bSwdenk
4287c609719bSwdenk	=> go 40004
4288c609719bSwdenk	## Starting application at 0x00040004 ...
4289c609719bSwdenk	TIMERS=0xfff00980
4290c609719bSwdenk	Using timer 1
4291c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
4292c609719bSwdenk
4293c609719bSwdenkHit 'b':
4294c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
4295c609719bSwdenk	Enabling timer
4296c609719bSwdenkHit '?':
4297c609719bSwdenk	[q, b, e, ?] ........
4298c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
4299c609719bSwdenkHit '?':
4300c609719bSwdenk	[q, b, e, ?] .
4301c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
4302c609719bSwdenkHit '?':
4303c609719bSwdenk	[q, b, e, ?] .
4304c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
4305c609719bSwdenkHit '?':
4306c609719bSwdenk	[q, b, e, ?] .
4307c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
4308c609719bSwdenkHit 'e':
4309c609719bSwdenk	[q, b, e, ?] ...Stopping timer
4310c609719bSwdenkHit 'q':
4311c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
4312c609719bSwdenk
4313c609719bSwdenk
431485ec0bccSwdenkMinicom warning:
431585ec0bccSwdenk================
431685ec0bccSwdenk
43177152b1d0SwdenkOver time, many people have reported problems when trying to use the
431885ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
431985ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
4320f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
432185ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
432285ec0bccSwdenkuse "cu" for S-Record download ("loads" command).
432385ec0bccSwdenk
432452f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
432552f52c14Swdenkconfiguration to your "File transfer protocols" section:
432652f52c14Swdenk
432752f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
432852f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
432952f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
433052f52c14Swdenk
433152f52c14Swdenk
4332c609719bSwdenkNetBSD Notes:
4333c609719bSwdenk=============
4334c609719bSwdenk
4335c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
4336c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
4337c609719bSwdenk
4338c609719bSwdenkBuilding requires a cross environment; it is known to work on
4339c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
4340c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
4341c609719bSwdenkNote that the cross-powerpc package does not install include files;
4342c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
4343c609719bSwdenkmissing.  This file has to be installed and patched manually:
4344c609719bSwdenk
4345c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
4346c609719bSwdenk	# mkdir powerpc
4347c609719bSwdenk	# ln -s powerpc machine
4348c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
4349c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
4350c609719bSwdenk
4351c609719bSwdenkNative builds *don't* work due to incompatibilities between native
4352c609719bSwdenkand U-Boot include files.
4353c609719bSwdenk
4354c609719bSwdenkBooting assumes that (the first part of) the image booted is a
4355c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
4356c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
4357c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
43582a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
4359c609719bSwdenk
4360c609719bSwdenk
4361c609719bSwdenkImplementation Internals:
4362c609719bSwdenk=========================
4363c609719bSwdenk
4364c609719bSwdenkThe following is not intended to be a complete description of every
4365c609719bSwdenkimplementation detail. However, it should help to understand the
4366c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
4367c609719bSwdenkhardware.
4368c609719bSwdenk
4369c609719bSwdenk
4370c609719bSwdenkInitial Stack, Global Data:
4371c609719bSwdenk---------------------------
4372c609719bSwdenk
4373c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
4374c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
4375c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
4376c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
4377c609719bSwdenkis not initialized as zero. To be able to get a C environment working
4378c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
4379c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
4380c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
4381c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
4382c609719bSwdenklocked as (mis-) used as memory, etc.
4383c609719bSwdenk
43847152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
43850668236bSWolfgang Denk	U-Boot mailing list:
438643d9616cSwdenk
438743d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
438843d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
438943d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
439043d9616cSwdenk	...
439143d9616cSwdenk
439243d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
439343d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
439443d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
439543d9616cSwdenk	is that the cache is being used as a temporary supply of
439643d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
439711ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
439843d9616cSwdenk	can see how this works by studying the cache architecture and
439943d9616cSwdenk	operation in the architecture and processor-specific manuals.
440043d9616cSwdenk
440143d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
440243d9616cSwdenk	is another option for the system designer to use as an
440311ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
440443d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
440543d9616cSwdenk	board designers haven't used it for something that would
440643d9616cSwdenk	cause you grief during the initial boot! It is frequently not
440743d9616cSwdenk	used.
440843d9616cSwdenk
44096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
441043d9616cSwdenk	with your processor/board/system design. The default value
441143d9616cSwdenk	you will find in any recent u-boot distribution in
44128a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
441343d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
441443d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
441543d9616cSwdenk	that are supposed to respond to that address! That code in
441643d9616cSwdenk	start.S has been around a while and should work as is when
441743d9616cSwdenk	you get the config right.
441843d9616cSwdenk
441943d9616cSwdenk	-Chris Hallinan
442043d9616cSwdenk	DS4.COM, Inc.
442143d9616cSwdenk
4422c609719bSwdenkIt is essential to remember this, since it has some impact on the C
4423c609719bSwdenkcode for the initialization procedures:
4424c609719bSwdenk
4425c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
4426c609719bSwdenk  to write it.
4427c609719bSwdenk
442811ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
4429c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
44307152b1d0Swdenk  zation is performed later (when relocating to RAM).
4431c609719bSwdenk
4432c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
4433c609719bSwdenk  that.
4434c609719bSwdenk
4435c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
4436c609719bSwdenknormal global data to share information beween the code. But it
4437c609719bSwdenkturned out that the implementation of U-Boot can be greatly
4438c609719bSwdenksimplified by making a global data structure (gd_t) available to all
4439c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
4440c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
4441c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
4442c609719bSwdenkplace a pointer (gd) to the global data into a register which we
4443c609719bSwdenkreserve for this purpose.
4444c609719bSwdenk
44457152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
4446c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
4447c609719bSwdenkGCC's implementation.
4448c609719bSwdenk
4449c609719bSwdenkFor PowerPC, the following registers have specific use:
4450c609719bSwdenk	R1:	stack pointer
4451e7670f6cSWolfgang Denk	R2:	reserved for system use
4452c609719bSwdenk	R3-R4:	parameter passing and return values
4453c609719bSwdenk	R5-R10: parameter passing
4454c609719bSwdenk	R13:	small data area pointer
4455c609719bSwdenk	R30:	GOT pointer
4456c609719bSwdenk	R31:	frame pointer
4457c609719bSwdenk
4458e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
4459e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
4460e6bee808SJoakim Tjernlund	going back and forth between asm and C)
4461c609719bSwdenk
4462e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
4463c609719bSwdenk
4464c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
4465c609719bSwdenk    address of the global data structure is known at compile time),
4466c609719bSwdenk    but it turned out that reserving a register results in somewhat
4467c609719bSwdenk    smaller code - although the code savings are not that big (on
4468c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
4469c609719bSwdenk    624 text + 127 data).
4470c609719bSwdenk
4471c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
44724c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
44734c58eb55SMike Frysinger
4474c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
44754c58eb55SMike Frysinger
4476c609719bSwdenkOn ARM, the following registers are used:
4477c609719bSwdenk
4478c609719bSwdenk	R0:	function argument word/integer result
4479c609719bSwdenk	R1-R3:	function argument word
4480c609719bSwdenk	R9:	GOT pointer
4481c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
4482c609719bSwdenk	R11:	argument (frame) pointer
4483c609719bSwdenk	R12:	temporary workspace
4484c609719bSwdenk	R13:	stack pointer
4485c609719bSwdenk	R14:	link register
4486c609719bSwdenk	R15:	program counter
4487c609719bSwdenk
4488c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
4489c609719bSwdenk
44900df01fd3SThomas ChouOn Nios II, the ABI is documented here:
44910df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
44920df01fd3SThomas Chou
44930df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
44940df01fd3SThomas Chou
44950df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
44960df01fd3SThomas Chou    to access small data sections, so gp is free.
44970df01fd3SThomas Chou
4498afc1ce82SMacpaul LinOn NDS32, the following registers are used:
4499afc1ce82SMacpaul Lin
4500afc1ce82SMacpaul Lin	R0-R1:	argument/return
4501afc1ce82SMacpaul Lin	R2-R5:	argument
4502afc1ce82SMacpaul Lin	R15:	temporary register for assembler
4503afc1ce82SMacpaul Lin	R16:	trampoline register
4504afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
4505afc1ce82SMacpaul Lin	R29:	global pointer (GP)
4506afc1ce82SMacpaul Lin	R30:	link register (LP)
4507afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
4508afc1ce82SMacpaul Lin	PC:	program counter (PC)
4509afc1ce82SMacpaul Lin
4510afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
4511afc1ce82SMacpaul Lin
4512d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
4513d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
4514c609719bSwdenk
4515c609719bSwdenkMemory Management:
4516c609719bSwdenk------------------
4517c609719bSwdenk
4518c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
4519c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
4520c609719bSwdenk
4521c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
4522c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
4523c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
4524c609719bSwdenkphysical memory banks.
4525c609719bSwdenk
4526c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
4527c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
4528c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
4529c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
45306d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
4531c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
4532c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
4533c609719bSwdenk
4534c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
4535c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
4536c609719bSwdenk
4537c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
4538c609719bSwdenkthis:
4539c609719bSwdenk
4540c609719bSwdenk	0x0000 0000	Exception Vector code
4541c609719bSwdenk	      :
4542c609719bSwdenk	0x0000 1FFF
4543c609719bSwdenk	0x0000 2000	Free for Application Use
4544c609719bSwdenk	      :
4545c609719bSwdenk	      :
4546c609719bSwdenk
4547c609719bSwdenk	      :
4548c609719bSwdenk	      :
4549c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
4550c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
4551c609719bSwdenk	0x00FC 0000	Malloc Arena
4552c609719bSwdenk	      :
4553c609719bSwdenk	0x00FD FFFF
4554c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
4555c609719bSwdenk	...		eventually: LCD or video framebuffer
4556c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
4557c609719bSwdenk	0x00FF FFFF	[End of RAM]
4558c609719bSwdenk
4559c609719bSwdenk
4560c609719bSwdenkSystem Initialization:
4561c609719bSwdenk----------------------
4562c609719bSwdenk
4563c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
456411ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
4565c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
45667152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
4567c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
4568c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
4569c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
4570c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
4571c609719bSwdenkthe caches and the SIU.
4572c609719bSwdenk
4573c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
4574c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
4575c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
4576c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
4577c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
4578c609719bSwdenksimple memory test is run that determines the size of the SDRAM
4579c609719bSwdenkbanks.
4580c609719bSwdenk
4581c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
45827152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
4583c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
4584c609719bSwdenk0x00000000, with any additional banks following immediately to create
4585c609719bSwdenkcontiguous memory starting from 0.
4586c609719bSwdenk
4587c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
4588c609719bSwdenkand allocates memory for use by malloc() and for the global Board
4589c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
4590c609719bSwdenkpages, and the final stack is set up.
4591c609719bSwdenk
4592c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
4593c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
4594c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
4595c609719bSwdenknew address in RAM.
4596c609719bSwdenk
4597c609719bSwdenk
4598c609719bSwdenkU-Boot Porting Guide:
4599c609719bSwdenk----------------------
4600c609719bSwdenk
4601c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
46026aff3115Swdenklist, October 2002]
4603c609719bSwdenk
4604c609719bSwdenk
4605c609719bSwdenkint main(int argc, char *argv[])
4606c609719bSwdenk{
4607c609719bSwdenk	sighandler_t no_more_time;
4608c609719bSwdenk
4609c609719bSwdenk	signal(SIGALRM, no_more_time);
4610c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
4611c609719bSwdenk
4612c609719bSwdenk	if (available_money > available_manpower) {
46136c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
4614c609719bSwdenk		return 0;
4615c609719bSwdenk	}
4616c609719bSwdenk
4617c609719bSwdenk	Download latest U-Boot source;
4618c609719bSwdenk
46190668236bSWolfgang Denk	Subscribe to u-boot mailing list;
46206aff3115Swdenk
46216c3fef28SJerry Van Baren	if (clueless)
4622c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
4623c609719bSwdenk
4624c609719bSwdenk	while (learning) {
4625c609719bSwdenk		Read the README file in the top level directory;
46267cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
46276c3fef28SJerry Van Baren		Read applicable doc/*.README;
4628c609719bSwdenk		Read the source, Luke;
46296c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
4630c609719bSwdenk	}
4631c609719bSwdenk
46326c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
46336c3fef28SJerry Van Baren		Buy a BDI3000;
46346c3fef28SJerry Van Baren	else
4635c609719bSwdenk		Add a lot of aggravation and time;
4636c609719bSwdenk
46376c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
46386c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
46396c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
46406c3fef28SJerry Van Baren	} else {
4641c609719bSwdenk		Create your own board support subdirectory;
46426c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
46436c3fef28SJerry Van Baren	}
46446c3fef28SJerry Van Baren	Edit new board/<myboard> files
46456c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
4646c609719bSwdenk
46476c3fef28SJerry Van Baren	while (!accepted) {
4648c609719bSwdenk		while (!running) {
4649c609719bSwdenk			do {
4650c609719bSwdenk				Add / modify source code;
4651c609719bSwdenk			} until (compiles);
4652c609719bSwdenk			Debug;
4653c609719bSwdenk			if (clueless)
4654c609719bSwdenk				email("Hi, I am having problems...");
4655c609719bSwdenk		}
46566c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
46576c3fef28SJerry Van Baren		if (reasonable critiques)
46586c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
46596c3fef28SJerry Van Baren		else
46606c3fef28SJerry Van Baren			Defend code as written;
46616c3fef28SJerry Van Baren	}
4662c609719bSwdenk
4663c609719bSwdenk	return 0;
4664c609719bSwdenk}
4665c609719bSwdenk
4666c609719bSwdenkvoid no_more_time (int sig)
4667c609719bSwdenk{
4668c609719bSwdenk      hire_a_guru();
4669c609719bSwdenk}
4670c609719bSwdenk
4671c609719bSwdenk
4672c609719bSwdenkCoding Standards:
4673c609719bSwdenk-----------------
4674c609719bSwdenk
4675c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
46762c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
46777ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
4678c609719bSwdenk
46792c051651SDetlev ZundelSource files originating from a different project (for example the
46802c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
46812c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
46822c051651SDetlev Zundelsources.
46832c051651SDetlev Zundel
46842c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
46852c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
46862c051651SDetlev Zundelin your code.
4687c609719bSwdenk
4688c178d3daSwdenkPlease also stick to the following formatting rules:
4689180d3f74Swdenk- remove any trailing white space
46907ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
4691180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
46927ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
4693180d3f74Swdenk- do not add trailing empty lines to source files
4694180d3f74Swdenk
4695c609719bSwdenkSubmissions which do not conform to the standards may be returned
4696c609719bSwdenkwith a request to reformat the changes.
4697c609719bSwdenk
4698c609719bSwdenk
4699c609719bSwdenkSubmitting Patches:
4700c609719bSwdenk-------------------
4701c609719bSwdenk
4702c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
4703c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
4704c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
4705c609719bSwdenk
47060d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
4707218ca724SWolfgang Denk
47080668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
47090668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
47100668236bSWolfgang Denk
4711c609719bSwdenkWhen you send a patch, please include the following information with
4712c609719bSwdenkit:
4713c609719bSwdenk
4714c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
4715c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
4716c609719bSwdenk  patch actually fixes something.
4717c609719bSwdenk
4718c609719bSwdenk* For new features: a description of the feature and your
4719c609719bSwdenk  implementation.
4720c609719bSwdenk
4721c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
4722c609719bSwdenk
4723c609719bSwdenk* For major contributions, your entry to the CREDITS file
4724c609719bSwdenk
4725c609719bSwdenk* When you add support for a new board, don't forget to add this
47267ca9296eSWolfgang Denk  board to the MAINTAINERS file, too.
4727c609719bSwdenk
4728c609719bSwdenk* If your patch adds new configuration options, don't forget to
4729c609719bSwdenk  document these in the README file.
4730c609719bSwdenk
4731218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
4732218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
47337ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
4734218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
4735218ca724SWolfgang Denk  with some other mail clients.
4736c609719bSwdenk
4737218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
4738218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
4739218ca724SWolfgang Denk  GNU diff.
47406dff5529Swdenk
4741218ca724SWolfgang Denk  The current directory when running this command shall be the parent
4742218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
4743218ca724SWolfgang Denk  your patch includes sufficient directory information for the
4744218ca724SWolfgang Denk  affected files).
4745218ca724SWolfgang Denk
4746218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
4747218ca724SWolfgang Denk  and compressed attachments must not be used.
4748c609719bSwdenk
474952f52c14Swdenk* If one logical set of modifications affects or creates several
475052f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
475152f52c14Swdenk
475252f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
475352f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
475452f52c14Swdenk
475552f52c14Swdenk
4756c609719bSwdenkNotes:
4757c609719bSwdenk
4758c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
4759c609719bSwdenk  source tree and make sure that no errors or warnings are reported
4760c609719bSwdenk  for any of the boards.
4761c609719bSwdenk
4762c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
4763c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
4764c609719bSwdenk  returned with a request to re-formatting / split it.
4765c609719bSwdenk
4766c609719bSwdenk* If you modify existing code, make sure that your new code does not
4767c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
4768c609719bSwdenk  When adding new features, these should compile conditionally only
4769c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
4770c609719bSwdenk  disabled must not need more memory than the old code without your
4771c609719bSwdenk  modification.
477290dc6704Swdenk
47730668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
47740668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
47750668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
47760668236bSWolfgang Denk  bigger than the size limit should be avoided.
4777