xref: /openbmc/u-boot/README (revision 19c402afa2e1190f596f35a84ac049b10d814f1f)
1c609719bSwdenk#
2b75190deSWolfgang Denk# (C) Copyright 2000 - 2012
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
57adb9d851SRobert P. J. DayNote: There is no CHANGELOG file in the actual U-Boot source tree;
58adb9d851SRobert P. J. Dayit can be created dynamically from the Git log using:
59adb9d851SRobert P. J. Day
60adb9d851SRobert P. J. Day	make CHANGELOG
61adb9d851SRobert P. J. Day
62c609719bSwdenk
63c609719bSwdenkWhere to get help:
64c609719bSwdenk==================
65c609719bSwdenk
66c609719bSwdenkIn case you have questions about, problems with or contributions for
67c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at
680c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic
690c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's.
700c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and
710c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot
72c609719bSwdenk
73c609719bSwdenk
74218ca724SWolfgang DenkWhere to get source code:
75218ca724SWolfgang Denk=========================
76218ca724SWolfgang Denk
77218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at
78218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at
79218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
80218ca724SWolfgang Denk
81218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of
8211ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also
83218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/
84218ca724SWolfgang Denkdirectory.
85218ca724SWolfgang Denk
86d4ee711dSAnatolij GustschinPre-built (and tested) images are available from
87218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/
88218ca724SWolfgang Denk
89218ca724SWolfgang Denk
90c609719bSwdenkWhere we come from:
91c609719bSwdenk===================
92c609719bSwdenk
93c609719bSwdenk- start from 8xxrom sources
9424ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot)
95c609719bSwdenk- clean up code
96c609719bSwdenk- make it easier to add custom boards
97c609719bSwdenk- make it possible to add other [PowerPC] CPUs
98c609719bSwdenk- extend functions, especially:
99c609719bSwdenk  * Provide extended interface to Linux boot loader
100c609719bSwdenk  * S-Record download
101c609719bSwdenk  * network boot
10211ccc33fSMarcel Ziswiler  * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
10324ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot)
104c609719bSwdenk- add other CPU families (starting with ARM)
10524ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot)
1060d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot
10724ee89b9Swdenk
10824ee89b9Swdenk
10924ee89b9SwdenkNames and Spelling:
11024ee89b9Swdenk===================
11124ee89b9Swdenk
11224ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling
11324ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments
11424ee89b9Swdenkin source files etc.). Example:
11524ee89b9Swdenk
11624ee89b9Swdenk	This is the README file for the U-Boot project.
11724ee89b9Swdenk
11824ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples:
11924ee89b9Swdenk
12024ee89b9Swdenk	include/asm-ppc/u-boot.h
12124ee89b9Swdenk
12224ee89b9Swdenk	#include <asm/u-boot.h>
12324ee89b9Swdenk
12424ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on
12524ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example:
12624ee89b9Swdenk
12724ee89b9Swdenk	U_BOOT_VERSION		u_boot_logo
12824ee89b9Swdenk	IH_OS_U_BOOT		u_boot_hush_start
129c609719bSwdenk
130c609719bSwdenk
13193f19cc0SwdenkVersioning:
13293f19cc0Swdenk===========
13393f19cc0Swdenk
134360d883aSThomas WeberStarting with the release in October 2008, the names of the releases
135360d883aSThomas Weberwere changed from numerical release numbers without deeper meaning
136360d883aSThomas Weberinto a time stamp based numbering. Regular releases are identified by
137360d883aSThomas Webernames consisting of the calendar year and month of the release date.
138360d883aSThomas WeberAdditional fields (if present) indicate release candidates or bug fix
139360d883aSThomas Weberreleases in "stable" maintenance trees.
14093f19cc0Swdenk
141360d883aSThomas WeberExamples:
142360d883aSThomas Weber	U-Boot v2009.11	    - Release November 2009
143360d883aSThomas Weber	U-Boot v2009.11.1   - Release 1 in version November 2009 stable tree
144360d883aSThomas Weber	U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
14593f19cc0Swdenk
14693f19cc0Swdenk
147c609719bSwdenkDirectory Hierarchy:
148c609719bSwdenk====================
149c609719bSwdenk
1508d321b81SPeter Tyser/arch			Architecture specific files
1518d321b81SPeter Tyser  /arm			Files generic to ARM architecture
1528d321b81SPeter Tyser    /cpu		CPU specific files
1538d321b81SPeter Tyser      /arm720t		Files specific to ARM 720 CPUs
1548d321b81SPeter Tyser      /arm920t		Files specific to ARM 920 CPUs
1556eb0921aSAndreas Bießmann	/at91		Files specific to Atmel AT91RM9200 CPU
1568d321b81SPeter Tyser	/imx		Files specific to Freescale MC9328 i.MX CPUs
1578d321b81SPeter Tyser	/s3c24x0	Files specific to Samsung S3C24X0 CPUs
1588d321b81SPeter Tyser      /arm925t		Files specific to ARM 925 CPUs
1598d321b81SPeter Tyser      /arm926ejs	Files specific to ARM 926 CPUs
1608d321b81SPeter Tyser      /arm1136		Files specific to ARM 1136 CPUs
1618d321b81SPeter Tyser      /ixp		Files specific to Intel XScale IXP CPUs
1628d321b81SPeter Tyser      /pxa		Files specific to Intel XScale PXA CPUs
1638d321b81SPeter Tyser      /s3c44b0		Files specific to Samsung S3C44B0 CPUs
1648d321b81SPeter Tyser      /sa1100		Files specific to Intel StrongARM SA1100 CPUs
1658d321b81SPeter Tyser    /lib		Architecture specific library files
1668d321b81SPeter Tyser  /avr32		Files generic to AVR32 architecture
1678d321b81SPeter Tyser    /cpu		CPU specific files
1688d321b81SPeter Tyser    /lib		Architecture specific library files
1698d321b81SPeter Tyser  /blackfin		Files generic to Analog Devices Blackfin architecture
1708d321b81SPeter Tyser    /cpu		CPU specific files
1718d321b81SPeter Tyser    /lib		Architecture specific library files
172fea25720SGraeme Russ  /x86			Files generic to x86 architecture
1738d321b81SPeter Tyser    /cpu		CPU specific files
1748d321b81SPeter Tyser    /lib		Architecture specific library files
1758d321b81SPeter Tyser  /m68k			Files generic to m68k architecture
1768d321b81SPeter Tyser    /cpu		CPU specific files
1778d321b81SPeter Tyser      /mcf52x2		Files specific to Freescale ColdFire MCF52x2 CPUs
1788d321b81SPeter Tyser      /mcf5227x		Files specific to Freescale ColdFire MCF5227x CPUs
1798d321b81SPeter Tyser      /mcf532x		Files specific to Freescale ColdFire MCF5329 CPUs
1808d321b81SPeter Tyser      /mcf5445x		Files specific to Freescale ColdFire MCF5445x CPUs
1818d321b81SPeter Tyser      /mcf547x_8x	Files specific to Freescale ColdFire MCF547x_8x CPUs
1828d321b81SPeter Tyser    /lib		Architecture specific library files
1838d321b81SPeter Tyser  /microblaze		Files generic to microblaze architecture
1848d321b81SPeter Tyser    /cpu		CPU specific files
1858d321b81SPeter Tyser    /lib		Architecture specific library files
1868d321b81SPeter Tyser  /mips			Files generic to MIPS architecture
1878d321b81SPeter Tyser    /cpu		CPU specific files
18892bbd64eSDaniel Schwierzeck      /mips32		Files specific to MIPS32 CPUs
18980421fccSXiangfu Liu      /xburst		Files specific to Ingenic XBurst CPUs
1908d321b81SPeter Tyser    /lib		Architecture specific library files
191afc1ce82SMacpaul Lin  /nds32		Files generic to NDS32 architecture
192afc1ce82SMacpaul Lin    /cpu		CPU specific files
193afc1ce82SMacpaul Lin      /n1213		Files specific to Andes Technology N1213 CPUs
194afc1ce82SMacpaul Lin    /lib		Architecture specific library files
1958d321b81SPeter Tyser  /nios2		Files generic to Altera NIOS2 architecture
1968d321b81SPeter Tyser    /cpu		CPU specific files
1978d321b81SPeter Tyser    /lib		Architecture specific library files
198a47a12beSStefan Roese  /powerpc		Files generic to PowerPC architecture
1998d321b81SPeter Tyser    /cpu		CPU specific files
2008d321b81SPeter Tyser      /74xx_7xx		Files specific to Freescale MPC74xx and 7xx CPUs
2018d321b81SPeter Tyser      /mpc5xx		Files specific to Freescale MPC5xx CPUs
2028d321b81SPeter Tyser      /mpc5xxx		Files specific to Freescale MPC5xxx CPUs
2038d321b81SPeter Tyser      /mpc8xx		Files specific to Freescale MPC8xx CPUs
2048d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
2058d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
2068d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
2078d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
2088d321b81SPeter Tyser    /lib		Architecture specific library files
2098d321b81SPeter Tyser  /sh			Files generic to SH architecture
2108d321b81SPeter Tyser    /cpu		CPU specific files
2118d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
2128d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
2138d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
2148d321b81SPeter Tyser    /lib		Architecture specific library files
2158d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
2168d321b81SPeter Tyser    /cpu		CPU specific files
2178d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2188d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2198d321b81SPeter Tyser    /lib		Architecture specific library files
2208d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2218d321b81SPeter Tyser/board			Board dependent files
2228d321b81SPeter Tyser/common			Misc architecture independent functions
2238d321b81SPeter Tyser/disk			Code for disk drive partition handling
2248d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2258d321b81SPeter Tyser/drivers		Commonly used device drivers
2268d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2278d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2288d321b81SPeter Tyser/include		Header Files
2298d321b81SPeter Tyser/lib			Files generic to all architectures
2308d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2318d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2328d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2338d321b81SPeter Tyser/net			Networking code
2348d321b81SPeter Tyser/post			Power On Self Test
2358d321b81SPeter Tyser/rtc			Real Time Clock drivers
2368d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
237c609719bSwdenk
238c609719bSwdenkSoftware Configuration:
239c609719bSwdenk=======================
240c609719bSwdenk
241c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
242c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
243c609719bSwdenk
244c609719bSwdenkThere are two classes of configuration variables:
245c609719bSwdenk
246c609719bSwdenk* Configuration _OPTIONS_:
247c609719bSwdenk  These are selectable by the user and have names beginning with
248c609719bSwdenk  "CONFIG_".
249c609719bSwdenk
250c609719bSwdenk* Configuration _SETTINGS_:
251c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
252c609719bSwdenk  you don't know what you're doing; they have names beginning with
2536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
254c609719bSwdenk
255c609719bSwdenkLater we will add a configuration tool - probably similar to or even
256c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
257c609719bSwdenkdo the configuration by hand, which means creating some symbolic
258c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
259c609719bSwdenkas an example here.
260c609719bSwdenk
261c609719bSwdenk
262c609719bSwdenkSelection of Processor Architecture and Board Type:
263c609719bSwdenk---------------------------------------------------
264c609719bSwdenk
265c609719bSwdenkFor all supported boards there are ready-to-use default
266c609719bSwdenkconfigurations available; just type "make <board_name>_config".
267c609719bSwdenk
268c609719bSwdenkExample: For a TQM823L module type:
269c609719bSwdenk
270c609719bSwdenk	cd u-boot
271c609719bSwdenk	make TQM823L_config
272c609719bSwdenk
27311ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
274c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
275c609719bSwdenkdirectory according to the instructions in cogent/README.
276c609719bSwdenk
277c609719bSwdenk
278c609719bSwdenkConfiguration Options:
279c609719bSwdenk----------------------
280c609719bSwdenk
281c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
282c609719bSwdenksuch information is kept in a configuration file
283c609719bSwdenk"include/configs/<board_name>.h".
284c609719bSwdenk
285c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
286c609719bSwdenk"include/configs/TQM823L.h".
287c609719bSwdenk
288c609719bSwdenk
2897f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2907f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2917f6c2cbcSwdenkbuild a config tool - later.
2927f6c2cbcSwdenk
2937f6c2cbcSwdenk
294c609719bSwdenkThe following options need to be configured:
295c609719bSwdenk
2962628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
297c609719bSwdenk
2982628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
2996ccec449SWolfgang Denk
3006ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
30109ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
302c609719bSwdenk
303c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
304c609719bSwdenk		Define exactly one of
305c609719bSwdenk		CONFIG_CMA286_60_OLD
306c609719bSwdenk--- FIXME --- not tested yet:
307c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
308c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
309c609719bSwdenk
310c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
311c609719bSwdenk		Define exactly one of
312c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
313c609719bSwdenk
314c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
315c609719bSwdenk		Define one or more of
316c609719bSwdenk		CONFIG_CMA302
317c609719bSwdenk
318c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
319c609719bSwdenk		Define one or more of
320c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
32111ccc33fSMarcel Ziswiler					  the LCD display every second with
322c609719bSwdenk					  a "rotator" |\-/|\-/
323c609719bSwdenk
3242535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3252535d602Swdenk		CONFIG_ADSTYPE
3262535d602Swdenk		Possible values are:
3276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3312535d602Swdenk
332cf946c6dSLei Wen- Marvell Family Member
333cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
334cf946c6dSLei Wen					  multiple fs option at one time
335cf946c6dSLei Wen					  for marvell soc family
336cf946c6dSLei Wen
337c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
338c609719bSwdenk		Define exactly one of
339c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
340c609719bSwdenk
34111ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
34266ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
34366ca92a5Swdenk					  get_gclk_freq() cannot work
3445da627a4Swdenk					  e.g. if there is no 32KHz
3455da627a4Swdenk					  reference PIT/RTC clock
34666ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
34766ca92a5Swdenk					  or XTAL/EXTAL)
348c609719bSwdenk
34966ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
35266ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
35375d1ea7fSwdenk			See doc/README.MPC866
35475d1ea7fSwdenk
3556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
35675d1ea7fSwdenk
35775d1ea7fSwdenk		Define this to measure the actual CPU clock instead
35875d1ea7fSwdenk		of relying on the correctness of the configured
35975d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
36075d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
36175d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
36375d1ea7fSwdenk
364506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
365506f3918SHeiko Schocher
366506f3918SHeiko Schocher		Define this option if you want to enable the
367506f3918SHeiko Schocher		ICache only when Code runs from RAM.
368506f3918SHeiko Schocher
36966412c63SKumar Gala- 85xx CPU Options:
370ffd06e02SYork Sun		CONFIG_SYS_PPC64
371ffd06e02SYork Sun
372ffd06e02SYork Sun		Specifies that the core is a 64-bit PowerPC implementation (implements
373ffd06e02SYork Sun		the "64" category of the Power ISA). This is necessary for ePAPR
374ffd06e02SYork Sun		compliance, among other possible reasons.
375ffd06e02SYork Sun
37666412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
37766412c63SKumar Gala
37866412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
37966412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
38066412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
38166412c63SKumar Gala
3828f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3838f29084aSKumar Gala
3848f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3858f29084aSKumar Gala		tree nodes for the given platform.
3868f29084aSKumar Gala
387afa6b551SPrabhakar Kushwaha		CONFIG_SYS_PPC_E500_DEBUG_TLB
388afa6b551SPrabhakar Kushwaha
389afa6b551SPrabhakar Kushwaha		Enables a temporary TLB entry to be used during boot to work
390afa6b551SPrabhakar Kushwaha		around limitations in e500v1 and e500v2 external debugger
391afa6b551SPrabhakar Kushwaha		support. This reduces the portions of the boot code where
392afa6b551SPrabhakar Kushwaha		breakpoints and single stepping do not work.  The value of this
393afa6b551SPrabhakar Kushwaha		symbol should be set to the TLB1 entry to be used for this
394afa6b551SPrabhakar Kushwaha		purpose.
395afa6b551SPrabhakar Kushwaha
39633eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510
39733eee330SScott Wood
39833eee330SScott Wood		Enables a workaround for erratum A004510.  If set,
39933eee330SScott Wood		then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
40033eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
40133eee330SScott Wood
40233eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
40333eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
40433eee330SScott Wood
40533eee330SScott Wood		Defines one or two SoC revisions (low 8 bits of SVR)
40633eee330SScott Wood		for which the A004510 workaround should be applied.
40733eee330SScott Wood
40833eee330SScott Wood		The rest of SVR is either not relevant to the decision
40933eee330SScott Wood		of whether the erratum is present (e.g. p2040 versus
41033eee330SScott Wood		p2041) or is implied by the build target, which controls
41133eee330SScott Wood		whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
41233eee330SScott Wood
41333eee330SScott Wood		See Freescale App Note 4493 for more information about
41433eee330SScott Wood		this erratum.
41533eee330SScott Wood
41674fa22edSPrabhakar Kushwaha		CONFIG_A003399_NOR_WORKAROUND
41774fa22edSPrabhakar Kushwaha		Enables a workaround for IFC erratum A003399. It is only
41874fa22edSPrabhakar Kushwaha		requred during NOR boot.
41974fa22edSPrabhakar Kushwaha
42033eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
42133eee330SScott Wood
42233eee330SScott Wood		This is the value to write into CCSR offset 0x18600
42333eee330SScott Wood		according to the A004510 workaround.
42433eee330SScott Wood
425765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_M2_RAM_ADDR
426765b0bdbSPriyanka Jain		This value denotes start offset of M2 memory
427765b0bdbSPriyanka Jain		which is directly connected to the DSP core.
428765b0bdbSPriyanka Jain
429765b0bdbSPriyanka Jain		CONFIG_SYS_FSL_DSP_CCSRBAR_DEFAULT
430765b0bdbSPriyanka Jain		This value denotes start offset of DSP CCSR space.
431765b0bdbSPriyanka Jain
4326cb461b4SDaniel Schwierzeck- Generic CPU options:
4336cb461b4SDaniel Schwierzeck		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
4346cb461b4SDaniel Schwierzeck
4356cb461b4SDaniel Schwierzeck		Defines the endianess of the CPU. Implementation of those
4366cb461b4SDaniel Schwierzeck		values is arch specific.
4376cb461b4SDaniel Schwierzeck
4380b953ffcSMarkus Klotzbuecher- Intel Monahans options:
4396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
4400b953ffcSMarkus Klotzbuecher
4410b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
4420b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
4430b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
4440b953ffcSMarkus Klotzbuecher
4456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
4460b953ffcSMarkus Klotzbuecher
4470b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
4480b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
4490b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
4500b953ffcSMarkus Klotzbuecher		by this value.
4510b953ffcSMarkus Klotzbuecher
45292bbd64eSDaniel Schwierzeck- MIPS CPU options:
45392bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
45492bbd64eSDaniel Schwierzeck
45592bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
45692bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
45792bbd64eSDaniel Schwierzeck		relocation.
45892bbd64eSDaniel Schwierzeck
45992bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
46092bbd64eSDaniel Schwierzeck
46192bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
46292bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
46392bbd64eSDaniel Schwierzeck		Possible values are:
46492bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
46592bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
46692bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
46792bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
46892bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
46992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
47092bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
47192bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
47292bbd64eSDaniel Schwierzeck
47392bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
47492bbd64eSDaniel Schwierzeck
47592bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
47692bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
47792bbd64eSDaniel Schwierzeck
47892bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
47992bbd64eSDaniel Schwierzeck
48092bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
48192bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
48292bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
48392bbd64eSDaniel Schwierzeck
484b67d8816SChristian Riesch- ARM options:
485b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
486b67d8816SChristian Riesch
487b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
488b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
489b67d8816SChristian Riesch
4905356f545SAneesh V		CONFIG_SYS_THUMB_BUILD
4915356f545SAneesh V
4925356f545SAneesh V		Use this flag to build U-Boot using the Thumb instruction
4935356f545SAneesh V		set for ARM architectures. Thumb instruction set provides
4945356f545SAneesh V		better code density. For ARM architectures that support
4955356f545SAneesh V		Thumb2 this flag will result in Thumb2 code generated by
4965356f545SAneesh V		GCC.
4975356f545SAneesh V
498c5d4752cSStephen Warren		CONFIG_ARM_ERRATA_716044
4990678587fSStephen Warren		CONFIG_ARM_ERRATA_742230
5000678587fSStephen Warren		CONFIG_ARM_ERRATA_743622
5010678587fSStephen Warren		CONFIG_ARM_ERRATA_751472
5020678587fSStephen Warren
5030678587fSStephen Warren		If set, the workarounds for these ARM errata are applied early
5040678587fSStephen Warren		during U-Boot startup. Note that these options force the
5050678587fSStephen Warren		workarounds to be applied; no CPU-type/version detection
5060678587fSStephen Warren		exists, unlike the similar options in the Linux kernel. Do not
5070678587fSStephen Warren		set these options unless they apply!
5080678587fSStephen Warren
509795659dcSStephen Warren- CPU timer options:
510795659dcSStephen Warren		CONFIG_SYS_HZ
511795659dcSStephen Warren
512795659dcSStephen Warren		The frequency of the timer returned by get_timer().
513795659dcSStephen Warren		get_timer() must operate in milliseconds and this CONFIG
514795659dcSStephen Warren		option must be set to 1000.
515795659dcSStephen Warren
5165da627a4Swdenk- Linux Kernel Interface:
517c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
518c609719bSwdenk
519c609719bSwdenk		U-Boot stores all clock information in Hz
520c609719bSwdenk		internally. For binary compatibility with older Linux
521c609719bSwdenk		kernels (which expect the clocks passed in the
522c609719bSwdenk		bd_info data to be in MHz) the environment variable
523c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
524c609719bSwdenk		converts clock data to MHZ before passing it to the
525c609719bSwdenk		Linux kernel.
526c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
527c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
528c609719bSwdenk		default environment.
529c609719bSwdenk
5305da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
5315da627a4Swdenk
53211ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
5335da627a4Swdenk		expect it to be in bytes, others in MB.
5345da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
5355da627a4Swdenk
536fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
537f57f70aaSWolfgang Denk
538f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
539213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
540213bf8c8SGerald Van Baren		concepts).
541213bf8c8SGerald Van Baren
542213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
543213bf8c8SGerald Van Baren		 * New libfdt-based support
544213bf8c8SGerald Van Baren		 * Adds the "fdt" command
5453bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
546213bf8c8SGerald Van Baren
547b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
548b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
549b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
550b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
551f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
552c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
553f57f70aaSWolfgang Denk
55411ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
55511ccc33fSMarcel Ziswiler		addresses
5563bb342fcSKim Phillips
5574e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
5584e253137SKumar Gala
5594e253137SKumar Gala		Board code has addition modification that it wants to make
5604e253137SKumar Gala		to the flat device tree before handing it off to the kernel
5616705d81eSwdenk
5620267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
5630267768eSMatthew McClintock
56411ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
5650267768eSMatthew McClintock		param header, the default value is zero if undefined.
5660267768eSMatthew McClintock
5673887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
5683887c3fbSHeiko Schocher
5693887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
5703887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
5713887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
5723887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
5733887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
5743887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
5753887c3fbSHeiko Schocher
5767eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
5777eb29398SIgor Grinberg
5787eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
5797eb29398SIgor Grinberg		machine type and must be used to specify the machine type
5807eb29398SIgor Grinberg		number as it appears in the ARM machine registry
5817eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
5827eb29398SIgor Grinberg		Only boards that have multiple machine types supported
5837eb29398SIgor Grinberg		in a single configuration file and the machine type is
5847eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
5857eb29398SIgor Grinberg
5860b2f4ecaSNiklaus Giger- vxWorks boot parameters:
5870b2f4ecaSNiklaus Giger
5880b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
5890b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
5900b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
5910b2f4ecaSNiklaus Giger
5920b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5930b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5940b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5950b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5960b2f4ecaSNiklaus Giger
5970b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5980b2f4ecaSNiklaus Giger
5990b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
6000b2f4ecaSNiklaus Giger
6010b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
6020b2f4ecaSNiklaus Giger		the defaults discussed just above.
6030b2f4ecaSNiklaus Giger
6042c451f78SAneesh V- Cache Configuration:
6052c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
6062c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
6072c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
6082c451f78SAneesh V
60993bc2193SAneesh V- Cache Configuration for ARM:
61093bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
61193bc2193SAneesh V				      controller
61293bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
61393bc2193SAneesh V					controller register space
61493bc2193SAneesh V
6156705d81eSwdenk- Serial Ports:
61648d0192fSAndreas Engel		CONFIG_PL010_SERIAL
6176705d81eSwdenk
6186705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
6196705d81eSwdenk
62048d0192fSAndreas Engel		CONFIG_PL011_SERIAL
6216705d81eSwdenk
6226705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
6236705d81eSwdenk
6246705d81eSwdenk		CONFIG_PL011_CLOCK
6256705d81eSwdenk
6266705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
6276705d81eSwdenk		the clock speed of the UARTs.
6286705d81eSwdenk
6296705d81eSwdenk		CONFIG_PL01x_PORTS
6306705d81eSwdenk
6316705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
6326705d81eSwdenk		define this to a list of base addresses for each (supported)
6336705d81eSwdenk		port. See e.g. include/configs/versatile.h
6346705d81eSwdenk
635910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
636910f1ae3SJohn Rigby
637910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
638910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
639910f1ae3SJohn Rigby		this variable to initialize the extra register.
640910f1ae3SJohn Rigby
641910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
642910f1ae3SJohn Rigby
643910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
644910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
645910f1ae3SJohn Rigby		variable to flush the UART at init time.
646910f1ae3SJohn Rigby
6476705d81eSwdenk
648c609719bSwdenk- Console Interface:
649c609719bSwdenk		Depending on board, define exactly one serial port
650c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
651c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
652c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
653c609719bSwdenk
654c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
655c609719bSwdenk		port routines must be defined elsewhere
656c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
657c609719bSwdenk
658c609719bSwdenk		CONFIG_CFB_CONSOLE
659c609719bSwdenk		Enables console device for a color framebuffer. Needs following
660c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
661c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
662c609719bSwdenk						(default big endian)
663c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
664c609719bSwdenk						rectangle fill
665c609719bSwdenk						(cf. smiLynxEM)
666c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
667c609719bSwdenk						bit-blit (cf. smiLynxEM)
668c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
669c609719bSwdenk						(cols=pitch)
670c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
671c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
672c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
673c609719bSwdenk						(0-5, cf. cfb_console.c)
674c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
675c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
676c609719bSwdenk						(i.e. i8042_kbd_init())
677c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
678c609719bSwdenk						(i.e. i8042_tstc)
679c609719bSwdenk			VIDEO_GETC_FCT		get char fct
680c609719bSwdenk						(i.e. i8042_getc)
681c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
682c609719bSwdenk						(requires blink timer
683c609719bSwdenk						cf. i8042.c)
6846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
685c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
686c609719bSwdenk						upper right corner
687602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
688c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
689c609719bSwdenk						upper left corner
690a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
691a6c7ad2fSwdenk						linux_logo.h for logo.
692a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
693c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
69411ccc33fSMarcel Ziswiler						additional board info beside
695c609719bSwdenk						the logo
696c609719bSwdenk
69733a35bbbSPali Rohár		When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
69833a35bbbSPali Rohár		a limited number of ANSI escape sequences (cursor control,
69933a35bbbSPali Rohár		erase functions and limited graphics rendition control).
70033a35bbbSPali Rohár
701c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
702c609719bSwdenk		default i/o. Serial console can be forced with
703c609719bSwdenk		environment 'console=serial'.
704c609719bSwdenk
705a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
706a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
707a3ad8e26Swdenk		the "silent" environment variable. See
708a3ad8e26Swdenk		doc/README.silent for more information.
709a3ad8e26Swdenk
710c609719bSwdenk- Console Baudrate:
711c609719bSwdenk		CONFIG_BAUDRATE - in bps
712c609719bSwdenk		Select one of the baudrates listed in
7136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
7146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
715c609719bSwdenk
716c92fac91SHeiko Schocher- Console Rx buffer length
717c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
718c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
7192b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
720c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
721c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
722c92fac91SHeiko Schocher		the SMC.
723c92fac91SHeiko Schocher
7249558b48aSGraeme Russ- Pre-Console Buffer:
7259558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
7269558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
7279558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
7289558b48aSGraeme Russ		buffer any console messages prior to the console being
7299558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
7309558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
7319558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
7329558b48aSGraeme Russ		bytes are output before the console is initialised, the
7339558b48aSGraeme Russ		earlier bytes are discarded.
7349558b48aSGraeme Russ
7359558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
7369558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
7379558b48aSGraeme Russ
738046a37bdSSonny Rao- Safe printf() functions
739046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
740046a37bdSSonny Rao		the printf() functions. These are defined in
741046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
742046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
743046a37bdSSonny Rao		If this option is not given then these functions will
744046a37bdSSonny Rao		silently discard their buffer size argument - this means
745046a37bdSSonny Rao		you are not getting any overflow checking in this case.
746046a37bdSSonny Rao
747c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
748c609719bSwdenk		Delay before automatically booting the default image;
749c609719bSwdenk		set to -1 to disable autoboot.
75093d7212fSJoe Hershberger		set to -2 to autoboot with no delay and not check for abort
75193d7212fSJoe Hershberger		(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
752c609719bSwdenk
753c609719bSwdenk		See doc/README.autoboot for these options that
754c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
755c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
756c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
757c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
758c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
759c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
760c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
761c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
762c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
763c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
764c609719bSwdenk		CONFIG_RESET_TO_RETRY
765c609719bSwdenk
766c609719bSwdenk- Autoboot Command:
767c609719bSwdenk		CONFIG_BOOTCOMMAND
768c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
769c609719bSwdenk		define a command string that is automatically executed
770c609719bSwdenk		when no character is read on the console interface
771c609719bSwdenk		within "Boot Delay" after reset.
772c609719bSwdenk
773c609719bSwdenk		CONFIG_BOOTARGS
774c609719bSwdenk		This can be used to pass arguments to the bootm
775c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
776c609719bSwdenk		environment value "bootargs".
777c609719bSwdenk
778c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
779c609719bSwdenk		The value of these goes into the environment as
780c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
781c609719bSwdenk		as a convenience, when switching between booting from
78211ccc33fSMarcel Ziswiler		RAM and NFS.
783c609719bSwdenk
784c609719bSwdenk- Pre-Boot Commands:
785c609719bSwdenk		CONFIG_PREBOOT
786c609719bSwdenk
787c609719bSwdenk		When this option is #defined, the existence of the
788c609719bSwdenk		environment variable "preboot" will be checked
789c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
790c609719bSwdenk		countdown and/or running the auto-boot command resp.
791c609719bSwdenk		entering interactive mode.
792c609719bSwdenk
793c609719bSwdenk		This feature is especially useful when "preboot" is
794c609719bSwdenk		automatically generated or modified. For an example
795c609719bSwdenk		see the LWMON board specific code: here "preboot" is
796c609719bSwdenk		modified when the user holds down a certain
797c609719bSwdenk		combination of keys on the (special) keyboard when
798c609719bSwdenk		booting the systems
799c609719bSwdenk
800c609719bSwdenk- Serial Download Echo Mode:
801c609719bSwdenk		CONFIG_LOADS_ECHO
802c609719bSwdenk		If defined to 1, all characters received during a
803c609719bSwdenk		serial download (using the "loads" command) are
804c609719bSwdenk		echoed back. This might be needed by some terminal
805c609719bSwdenk		emulations (like "cu"), but may as well just take
806c609719bSwdenk		time on others. This setting #define's the initial
807c609719bSwdenk		value of the "loads_echo" environment variable.
808c609719bSwdenk
809602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
810c609719bSwdenk		CONFIG_KGDB_BAUDRATE
811c609719bSwdenk		Select one of the baudrates listed in
8126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
813c609719bSwdenk
814c609719bSwdenk- Monitor Functions:
815602ad3b3SJon Loeliger		Monitor commands can be included or excluded
816602ad3b3SJon Loeliger		from the build by using the #include files
817c6c621bdSStephen Warren		<config_cmd_all.h> and #undef'ing unwanted
818c6c621bdSStephen Warren		commands, or using <config_cmd_default.h>
819602ad3b3SJon Loeliger		and augmenting with additional #define's
820602ad3b3SJon Loeliger		for wanted commands.
821c609719bSwdenk
822602ad3b3SJon Loeliger		The default command configuration includes all commands
823602ad3b3SJon Loeliger		except those marked below with a "*".
824602ad3b3SJon Loeliger
825602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
826602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
827602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
828602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
829602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
830602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
831602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
832602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
833710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
834602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
835602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
836602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
837a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
838a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
839a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
840a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
841602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
842602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
843246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
844602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
845602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
8465e2b3e0cSJoe Hershberger		CONFIG_CMD_ENV_CALLBACK	* display details about env callbacks
847fffad71bSJoe Hershberger		CONFIG_CMD_ENV_FLAGS	* display details about env flags
8480c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
84903e2ecf6SStephen Warren		CONFIG_CMD_EXT2		* ext2 command support
85003e2ecf6SStephen Warren		CONFIG_CMD_EXT4		* ext4 command support
851bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
852602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
85303e2ecf6SStephen Warren		CONFIG_CMD_FAT		* FAT command support
854602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
855602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
856602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
857ccca7dfdSBenoît Thébaudeau		CONFIG_CMD_FUSE		  Device fuse support
85853fdc7efSAnton Staaf		CONFIG_CMD_GETTIME	* Get time since boot
859a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
860a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
861bf36c5d5SSimon Glass		CONFIG_CMD_HASH		* calculate hash / digest
862602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
863602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
864602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
865602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
8668fdf1e0fSVipin Kumar		CONFIG_CMD_IMLS		  List all images found in NOR flash
8678fdf1e0fSVipin Kumar		CONFIG_CMD_IMLS_NAND	  List all images found in NAND flash
868602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
8690c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
870c167cc02SJoe Hershberger		CONFIG_CMD_INI		* import data from an ini file into the env
871602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
872602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
873602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
874602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
8751ba7fd25SMike Frysinger		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
876d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
877d22c338eSJoe Hershberger					  (169.254.*.*)
878602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
879602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
88002c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
88102c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
88215a33e49SSimon Glass		CONFIG_CMD_MEMINFO	* Display detailed memory information
883602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
884a2681707SWolfgang Denk					  loop, loopw
885a2681707SWolfgang Denk		CONFIG_CMD_MEMTEST	  mtest
886602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
887602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
888602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
88968d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
890602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
891602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
892e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
893e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
894602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
895602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
896602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
897602ad3b3SJon Loeliger					  host
898602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
899ff048ea9SKenneth Waters		CONFIG_CMD_READ		* Read raw data from partition
900602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
901602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
902d304931fSSimon Glass		CONFIG_CMD_SANDBOX	* sb command to access sandbox features
903602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
904602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
905602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
906602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
907602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
908602ad3b3SJon Loeliger					  (4xx only)
909f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
910c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
91102c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
9127d861d95SBob Liu		CONFIG_CMD_SOFTSWITCH	* Soft switch setting command for BF60x
91374de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
914602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
9157a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
9161fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
917da83bcd7SJoe Hershberger		CONFIG_CMD_TIME		* run command and report execution time (ARM specific)
918da83bcd7SJoe Hershberger		CONFIG_CMD_TIMER	* access to the system tick timer
919602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
920602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
921c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
922c609719bSwdenk
923c609719bSwdenk
924c609719bSwdenk		EXAMPLE: If you want all functions except of network
925c609719bSwdenk		support you can write:
926c609719bSwdenk
927602ad3b3SJon Loeliger		#include "config_cmd_all.h"
928602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
929c609719bSwdenk
930213bf8c8SGerald Van Baren	Other Commands:
931213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
932c609719bSwdenk
933c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
934602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
935c609719bSwdenk		what you (and your U-Boot users) are doing. Data
936c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
937c609719bSwdenk		8260 (where accesses to the IMMR region must be
938c609719bSwdenk		uncached), and it cannot be disabled on all other
939c609719bSwdenk		systems where we (mis-) use the data cache to hold an
940c609719bSwdenk		initial stack and some data.
941c609719bSwdenk
942c609719bSwdenk
943c609719bSwdenk		XXX - this list needs to get updated!
944c609719bSwdenk
945a5ecbe62SWolfgang Denk- Regular expression support:
946a5ecbe62SWolfgang Denk		CONFIG_REGEX
947a5ecbe62SWolfgang Denk                If this variable is defined, U-Boot is linked against
948a5ecbe62SWolfgang Denk                the SLRE (Super Light Regular Expression) library,
949a5ecbe62SWolfgang Denk                which adds regex support to some commands, as for
950a5ecbe62SWolfgang Denk                example "env grep" and "setexpr".
951a5ecbe62SWolfgang Denk
95245ba8077SSimon Glass- Device tree:
95345ba8077SSimon Glass		CONFIG_OF_CONTROL
95445ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
95545ba8077SSimon Glass		to configure its devices, instead of relying on statically
95645ba8077SSimon Glass		compiled #defines in the board file. This option is
95745ba8077SSimon Glass		experimental and only available on a few boards. The device
95845ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
95945ba8077SSimon Glass
9602c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
9612c0f79e4SSimon Glass		be done using one of the two options below:
962bbb0b128SSimon Glass
963bbb0b128SSimon Glass		CONFIG_OF_EMBED
964bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
965bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
966bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
967bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
968bbb0b128SSimon Glass		the global data structure as gd->blob.
96945ba8077SSimon Glass
9702c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
9712c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
9722c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
9732c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
9742c0f79e4SSimon Glass
9752c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
9762c0f79e4SSimon Glass
9772c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
9782c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
9792c0f79e4SSimon Glass		still use the individual files if you need something more
9802c0f79e4SSimon Glass		exotic.
9812c0f79e4SSimon Glass
982c609719bSwdenk- Watchdog:
983c609719bSwdenk		CONFIG_WATCHDOG
984c609719bSwdenk		If this variable is defined, it enables watchdog
9856abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
9866abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
9876abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
9886abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
9896abe6fb6SDetlev Zundel		available, then no further board specific code should
9906abe6fb6SDetlev Zundel		be needed to use it.
9916abe6fb6SDetlev Zundel
9926abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
9936abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
9946abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
9956abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
996c609719bSwdenk
997c1551ea8Sstroese- U-Boot Version:
998c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
999c1551ea8Sstroese		If this variable is defined, an environment variable
1000c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
1001c1551ea8Sstroese		version as printed by the "version" command.
1002a1ea8e51SBenoît Thébaudeau		Any change to this variable will be reverted at the
1003a1ea8e51SBenoît Thébaudeau		next reset.
1004c1551ea8Sstroese
1005c609719bSwdenk- Real-Time Clock:
1006c609719bSwdenk
1007602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
1008c609719bSwdenk		has to be selected, too. Define exactly one of the
1009c609719bSwdenk		following options:
1010c609719bSwdenk
1011c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
1012c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
10134e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
1014c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
10151cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
1016c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
10177f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
10183bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
10199536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
10204c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
10216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
102271d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
102371d19f30SHeiko Schocher					  RV3029 RTC.
1024c609719bSwdenk
1025b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
1026b37c7e5eSwdenk		must also be configured. See I2C Support, below.
1027b37c7e5eSwdenk
1028e92739d3SPeter Tyser- GPIO Support:
1029e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
1030e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
1031e92739d3SPeter Tyser
10325dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
10335dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
10345dec49caSChris Packham		pins supported by a particular chip.
10355dec49caSChris Packham
1036e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
1037e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
1038e92739d3SPeter Tyser
1039c609719bSwdenk- Timestamp Support:
1040c609719bSwdenk
1041c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
1042c609719bSwdenk		(date and time) of an image is printed by image
1043c609719bSwdenk		commands like bootm or iminfo. This option is
1044602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
1045c609719bSwdenk
1046923c46f9SKarl O. Pinc- Partition Labels (disklabels) Supported:
1047923c46f9SKarl O. Pinc		Zero or more of the following:
1048923c46f9SKarl O. Pinc		CONFIG_MAC_PARTITION   Apple's MacOS partition table.
1049923c46f9SKarl O. Pinc		CONFIG_DOS_PARTITION   MS Dos partition table, traditional on the
1050923c46f9SKarl O. Pinc				       Intel architecture, USB sticks, etc.
1051923c46f9SKarl O. Pinc		CONFIG_ISO_PARTITION   ISO partition table, used on CDROM etc.
1052923c46f9SKarl O. Pinc		CONFIG_EFI_PARTITION   GPT partition table, common when EFI is the
1053923c46f9SKarl O. Pinc				       bootloader.  Note 2TB partition limit; see
1054923c46f9SKarl O. Pinc				       disk/part_efi.c
1055923c46f9SKarl O. Pinc		CONFIG_MTD_PARTITIONS  Memory Technology Device partition table.
1056c609719bSwdenk
1057602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1058218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
1059923c46f9SKarl O. Pinc		least one non-MTD partition type as well.
1060c609719bSwdenk
1061c609719bSwdenk- IDE Reset method:
10624d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
10634d13cbadSwdenk		board configurations files but used nowhere!
1064c609719bSwdenk
10654d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
10664d13cbadSwdenk		be performed by calling the function
10674d13cbadSwdenk			ide_set_reset(int reset)
10684d13cbadSwdenk		which has to be defined in a board specific file
1069c609719bSwdenk
1070c609719bSwdenk- ATAPI Support:
1071c609719bSwdenk		CONFIG_ATAPI
1072c609719bSwdenk
1073c609719bSwdenk		Set this to enable ATAPI support.
1074c609719bSwdenk
1075c40b2956Swdenk- LBA48 Support
1076c40b2956Swdenk		CONFIG_LBA48
1077c40b2956Swdenk
1078c40b2956Swdenk		Set this to enable support for disks larger than 137GB
10794b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
1080c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
1081c40b2956Swdenk		support disks up to 2.1TB.
1082c40b2956Swdenk
10836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
1084c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
1085c40b2956Swdenk			Default is 32bit.
1086c40b2956Swdenk
1087c609719bSwdenk- SCSI Support:
1088c609719bSwdenk		At the moment only there is only support for the
1089c609719bSwdenk		SYM53C8XX SCSI controller; define
1090c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
1091c609719bSwdenk
10926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
10936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
10946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1095c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
1096c609719bSwdenk		devices.
10976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1098c609719bSwdenk
1099447c031bSStefan Reinauer                The environment variable 'scsidevs' is set to the number of
1100447c031bSStefan Reinauer                SCSI devices found during the last scan.
1101447c031bSStefan Reinauer
1102c609719bSwdenk- NETWORK Support (PCI):
1103682011ffSwdenk		CONFIG_E1000
1104ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1105ce5207e1SKyle Moffett
1106ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1107ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1108ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1109ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1110ce5207e1SKyle Moffett
1111ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1112ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1113ce5207e1SKyle Moffett		example with the "sspi" command.
1114ce5207e1SKyle Moffett
1115ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1116ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1117ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1118682011ffSwdenk
1119ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
112011ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1121ac3315c2SAndre Schwarz
1122c609719bSwdenk		CONFIG_EEPRO100
1123c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
112411ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1125c609719bSwdenk		write routine for first time initialisation.
1126c609719bSwdenk
1127c609719bSwdenk		CONFIG_TULIP
1128c609719bSwdenk		Support for Digital 2114x chips.
1129c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1130c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1131c609719bSwdenk
1132c609719bSwdenk		CONFIG_NATSEMI
1133c609719bSwdenk		Support for National dp83815 chips.
1134c609719bSwdenk
1135c609719bSwdenk		CONFIG_NS8382X
1136c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1137c609719bSwdenk
113845219c46Swdenk- NETWORK Support (other):
113945219c46Swdenk
1140c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1141c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1142c041e9d2SJens Scharsig
1143c041e9d2SJens Scharsig			CONFIG_RMII
1144c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1145c041e9d2SJens Scharsig
1146c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1147c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1148c041e9d2SJens Scharsig			The driver doen't show link status messages.
1149c041e9d2SJens Scharsig
1150efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1151efdd7319SRob Herring		Support for the Calxeda XGMAC device
1152efdd7319SRob Herring
11533bb46d23SAshok		CONFIG_LAN91C96
115445219c46Swdenk		Support for SMSC's LAN91C96 chips.
115545219c46Swdenk
115645219c46Swdenk			CONFIG_LAN91C96_BASE
115745219c46Swdenk			Define this to hold the physical address
115845219c46Swdenk			of the LAN91C96's I/O space
115945219c46Swdenk
116045219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
116145219c46Swdenk			Define this to enable 32 bit addressing
116245219c46Swdenk
11633bb46d23SAshok		CONFIG_SMC91111
1164f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1165f39748aeSwdenk
1166f39748aeSwdenk			CONFIG_SMC91111_BASE
1167f39748aeSwdenk			Define this to hold the physical address
1168f39748aeSwdenk			of the device (I/O space)
1169f39748aeSwdenk
1170f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1171f39748aeSwdenk			Define this if data bus is 32 bits
1172f39748aeSwdenk
1173f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1174f39748aeSwdenk			Define this to use i/o functions instead of macros
1175f39748aeSwdenk			(some hardware wont work with macros)
1176f39748aeSwdenk
1177dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1178dc02badaSHeiko Schocher		Support for davinci emac
1179dc02badaSHeiko Schocher
1180dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1181dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1182dc02badaSHeiko Schocher
1183b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1184b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1185b3dbf4a5SMacpaul Lin
1186b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1187b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1188b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1189b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1190b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1191b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1192b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1193b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1194b3dbf4a5SMacpaul Lin
1195c2fff331SMike Rapoport		CONFIG_SMC911X
1196557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1197557b377dSJens Gehrlein
1198c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1199557b377dSJens Gehrlein			Define this to hold the physical address
1200557b377dSJens Gehrlein			of the device (I/O space)
1201557b377dSJens Gehrlein
1202c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1203557b377dSJens Gehrlein			Define this if data bus is 32 bits
1204557b377dSJens Gehrlein
1205c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1206557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1207557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1208c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1209557b377dSJens Gehrlein
12103d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
12113d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
12123d0075faSYoshihiro Shimoda
12133d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
12143d0075faSYoshihiro Shimoda			Define the number of ports to be used
12153d0075faSYoshihiro Shimoda
12163d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
12173d0075faSYoshihiro Shimoda			Define the ETH PHY's address
12183d0075faSYoshihiro Shimoda
121968260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
122068260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
122168260aabSYoshihiro Shimoda
12225e124724SVadim Bendebury- TPM Support:
122390899cc0SChe-liang Chiou		CONFIG_TPM
122490899cc0SChe-liang Chiou		Support TPM devices.
122590899cc0SChe-liang Chiou
12261b393db5STom Wai-Hong Tam		CONFIG_TPM_TIS_I2C
12271b393db5STom Wai-Hong Tam		Support for i2c bus TPM devices. Only one device
12281b393db5STom Wai-Hong Tam		per system is supported at this time.
12291b393db5STom Wai-Hong Tam
12301b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BUS_NUMBER
12311b393db5STom Wai-Hong Tam			Define the the i2c bus number for the TPM device
12321b393db5STom Wai-Hong Tam
12331b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS
12341b393db5STom Wai-Hong Tam			Define the TPM's address on the i2c bus
12351b393db5STom Wai-Hong Tam
12361b393db5STom Wai-Hong Tam			CONFIG_TPM_TIS_I2C_BURST_LIMITATION
12371b393db5STom Wai-Hong Tam			Define the burst count bytes upper limit
12381b393db5STom Wai-Hong Tam
123990899cc0SChe-liang Chiou		CONFIG_TPM_TIS_LPC
12405e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
12415e124724SVadim Bendebury		per system is supported at this time.
12425e124724SVadim Bendebury
12435e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
12445e124724SVadim Bendebury			Base address where the generic TPM device is mapped
12455e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
12465e124724SVadim Bendebury			0xfed40000.
12475e124724SVadim Bendebury
1248c609719bSwdenk- USB Support:
1249c609719bSwdenk		At the moment only the UHCI host controller is
12504d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1251c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1252c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
125330d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1254c609719bSwdenk		storage devices.
1255c609719bSwdenk		Note:
1256c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1257c609719bSwdenk		(TEAC FD-05PUB).
12584d13cbadSwdenk		MPC5200 USB requires additional defines:
12594d13cbadSwdenk			CONFIG_USB_CLOCK
12604d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1261307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1262307ecb6dSEric Millbrandt				for USB on PSC3
12634d13cbadSwdenk			CONFIG_USB_CONFIG
12644d13cbadSwdenk				for differential drivers: 0x00001000
12654d13cbadSwdenk				for single ended drivers: 0x00005000
1266307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1267307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
12686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1269fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1270fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
12714d13cbadSwdenk
12729ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
12739ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
12749ab4ce22SSimon Glass
1275aa155058SKuo-Jung Su		CONFIG_USB_HUB_MIN_POWER_ON_DELAY defines the minimum
1276aa155058SKuo-Jung Su		interval for usb hub power-on delay.(minimum 100msec)
1277aa155058SKuo-Jung Su
127816c8d5e7SWolfgang Denk- USB Device:
127916c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
128016c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
128116c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
128211ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
128316c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
128416c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
128516c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
128616c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
128716c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
128816c8d5e7SWolfgang Denk		a Linux host by
128916c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
129016c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
129116c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
129216c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
129316c8d5e7SWolfgang Denk
129416c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
129516c8d5e7SWolfgang Denk			Define this to build a UDC device
129616c8d5e7SWolfgang Denk
129716c8d5e7SWolfgang Denk			CONFIG_USB_TTY
129816c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
129916c8d5e7SWolfgang Denk			talk to the UDC device
130016c8d5e7SWolfgang Denk
1301f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1302f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1303f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1304f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1305f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1306f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1307f9da0f89SVipin KUMAR			speed.
1308f9da0f89SVipin KUMAR
13096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
131016c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
131116c8d5e7SWolfgang Denk			be set to usbtty.
131216c8d5e7SWolfgang Denk
131316c8d5e7SWolfgang Denk			mpc8xx:
13146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
131516c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
13166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
131716c8d5e7SWolfgang Denk
13186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
131916c8d5e7SWolfgang Denk				Derive USB clock from brgclk
13206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
132116c8d5e7SWolfgang Denk
132216c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
132316c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
132416c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
132516c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
132616c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
132716c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
132816c8d5e7SWolfgang Denk
132916c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
133016c8d5e7SWolfgang Denk			Define this string as the name of your company for
133116c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
133216c8d5e7SWolfgang Denk
133316c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
133416c8d5e7SWolfgang Denk			Define this string as the name of your product
133516c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
133616c8d5e7SWolfgang Denk
133716c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
133816c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
133916c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
134016c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
134116c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
134216c8d5e7SWolfgang Denk
134316c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
134416c8d5e7SWolfgang Denk			Define this as the unique Product ID
134516c8d5e7SWolfgang Denk			for your device
134616c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1347c609719bSwdenk
1348d70a560fSIgor Grinberg- ULPI Layer Support:
1349d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1350d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1351d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1352d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1353d70a560fSIgor Grinberg		viewport is supported.
1354d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1355d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
13566d365ea0SLucas Stach		If your ULPI phy needs a different reference clock than the
13576d365ea0SLucas Stach		standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
13586d365ea0SLucas Stach		the appropriate value in Hz.
1359c609719bSwdenk
1360c609719bSwdenk- MMC Support:
1361c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1362c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1363c609719bSwdenk		accessed from the boot prompt by mapping the device
1364c609719bSwdenk		to physical memory similar to flash. Command line is
1365602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1366602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1367c609719bSwdenk
1368afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1369afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1370afb35666SYoshihiro Shimoda
1371afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1372afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1373afb35666SYoshihiro Shimoda
1374afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1375afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1376afb35666SYoshihiro Shimoda
1377b3ba6e94STom Rini- USB Device Firmware Update (DFU) class support:
1378b3ba6e94STom Rini		CONFIG_DFU_FUNCTION
1379b3ba6e94STom Rini		This enables the USB portion of the DFU USB class
1380b3ba6e94STom Rini
1381b3ba6e94STom Rini		CONFIG_CMD_DFU
1382b3ba6e94STom Rini		This enables the command "dfu" which is used to have
1383b3ba6e94STom Rini		U-Boot create a DFU class device via USB.  This command
1384b3ba6e94STom Rini		requires that the "dfu_alt_info" environment variable be
1385b3ba6e94STom Rini		set and define the alt settings to expose to the host.
1386b3ba6e94STom Rini
1387b3ba6e94STom Rini		CONFIG_DFU_MMC
1388b3ba6e94STom Rini		This enables support for exposing (e)MMC devices via DFU.
1389b3ba6e94STom Rini
1390c6631764SPantelis Antoniou		CONFIG_DFU_NAND
1391c6631764SPantelis Antoniou		This enables support for exposing NAND devices via DFU.
1392c6631764SPantelis Antoniou
1393ea2453d5SPantelis Antoniou		CONFIG_SYS_DFU_MAX_FILE_SIZE
1394ea2453d5SPantelis Antoniou		When updating files rather than the raw storage device,
1395ea2453d5SPantelis Antoniou		we use a static buffer to copy the file into and then write
1396ea2453d5SPantelis Antoniou		the buffer once we've been given the whole file.  Define
1397ea2453d5SPantelis Antoniou		this to the maximum filesize (in bytes) for the buffer.
1398ea2453d5SPantelis Antoniou		Default is 4 MiB if undefined.
1399ea2453d5SPantelis Antoniou
14006705d81eSwdenk- Journaling Flash filesystem support:
14016705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
14026705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
14036705d81eSwdenk		Define these for a default partition on a NAND device
14046705d81eSwdenk
14056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
14066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
14076705d81eSwdenk		Define these for a default partition on a NOR device
14086705d81eSwdenk
14096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
14106705d81eSwdenk		Define this to create an own partition. You have to provide a
14116705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
14126705d81eSwdenk
14136705d81eSwdenk		If you define only one JFFS2 partition you may also want to
14146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
14156705d81eSwdenk		to disable the command chpart. This is the default when you
14166705d81eSwdenk		have not defined a custom partition
14176705d81eSwdenk
1418c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1419c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1420656f4c65SDonggeun Kim
1421656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1422656f4c65SDonggeun Kim		file in FAT formatted partition.
1423656f4c65SDonggeun Kim
1424656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1425656f4c65SDonggeun Kim		user to write files to FAT.
1426c30a15e5SDonggeun Kim
142784cd9327SGabe BlackCBFS (Coreboot Filesystem) support
142884cd9327SGabe Black		CONFIG_CMD_CBFS
142984cd9327SGabe Black
143084cd9327SGabe Black		Define this to enable support for reading from a Coreboot
143184cd9327SGabe Black		filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
143284cd9327SGabe Black		and cbfsload.
143384cd9327SGabe Black
1434c609719bSwdenk- Keyboard Support:
1435c609719bSwdenk		CONFIG_ISA_KEYBOARD
1436c609719bSwdenk
1437c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1438c609719bSwdenk		support
1439c609719bSwdenk
1440c609719bSwdenk		CONFIG_I8042_KBD
1441c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1442c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1443c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1444c609719bSwdenk		for cfb_console. Supports cursor blinking.
1445c609719bSwdenk
1446713cb680SHung-ying Tyan		CONFIG_CROS_EC_KEYB
1447713cb680SHung-ying Tyan		Enables a Chrome OS keyboard using the CROS_EC interface.
1448713cb680SHung-ying Tyan		This uses CROS_EC to communicate with a second microcontroller
1449713cb680SHung-ying Tyan		which provides key scans on request.
1450713cb680SHung-ying Tyan
1451c609719bSwdenk- Video support:
1452c609719bSwdenk		CONFIG_VIDEO
1453c609719bSwdenk
1454c609719bSwdenk		Define this to enable video support (for output to
1455c609719bSwdenk		video).
1456c609719bSwdenk
1457c609719bSwdenk		CONFIG_VIDEO_CT69000
1458c609719bSwdenk
1459c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1460c609719bSwdenk
1461c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1462eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1463eeb1b77bSwdenk		video output is selected via environment 'videoout'
1464eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1465eeb1b77bSwdenk		assumed.
1466c609719bSwdenk
1467eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
146811ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1469eeb1b77bSwdenk		are possible:
1470eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1471eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1472eeb1b77bSwdenk
1473eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1474eeb1b77bSwdenk		-------------+---------------------------------------------
1475eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1476eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1477eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1478eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1479eeb1b77bSwdenk		-------------+---------------------------------------------
1480c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1481c609719bSwdenk
1482eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
14837817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1484eeb1b77bSwdenk
1485eeb1b77bSwdenk
1486a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1487a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1488a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1489a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1490a6c7ad2fSwdenk
14917d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
14927d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
14937d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
14947d3053fbSTimur Tabi		support, and should also define these other macros:
14957d3053fbSTimur Tabi
14967d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
14977d3053fbSTimur Tabi			CONFIG_VIDEO
14987d3053fbSTimur Tabi			CONFIG_CMD_BMP
14997d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
15007d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
15017d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
15027d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
15037d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
15047d3053fbSTimur Tabi
1505ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1506ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1507ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1508ba8e76bdSTimur Tabi		description of this variable.
15097d3053fbSTimur Tabi
1510058d59b0SSimon Glass		CONFIG_VIDEO_VGA
1511058d59b0SSimon Glass
1512058d59b0SSimon Glass		Enable the VGA video / BIOS for x86. The alternative if you
1513058d59b0SSimon Glass		are using coreboot is to use the coreboot frame buffer
1514058d59b0SSimon Glass		driver.
1515058d59b0SSimon Glass
1516058d59b0SSimon Glass
1517682011ffSwdenk- Keyboard Support:
1518682011ffSwdenk		CONFIG_KEYBOARD
1519682011ffSwdenk
1520682011ffSwdenk		Define this to enable a custom keyboard support.
1521682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1522682011ffSwdenk		defined in your board-specific files.
1523682011ffSwdenk		The only board using this so far is RBC823.
1524a6c7ad2fSwdenk
1525c609719bSwdenk- LCD Support:	CONFIG_LCD
1526c609719bSwdenk
1527c609719bSwdenk		Define this to enable LCD support (for output to LCD
1528c609719bSwdenk		display); also select one of the supported displays
1529c609719bSwdenk		by defining one of these:
1530c609719bSwdenk
153139cf4804SStelian Pop		CONFIG_ATMEL_LCD:
153239cf4804SStelian Pop
153339cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
153439cf4804SStelian Pop
1535fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1536c609719bSwdenk
1537fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1538c609719bSwdenk
1539fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1540c609719bSwdenk
1541fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1542fd3103bbSwdenk			Active, color, single scan.
1543fd3103bbSwdenk
1544fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1545fd3103bbSwdenk
1546fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1547c609719bSwdenk			Active, color, single scan.
1548c609719bSwdenk
1549c609719bSwdenk		CONFIG_SHARP_16x9
1550c609719bSwdenk
1551c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1552c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1553c609719bSwdenk
1554c609719bSwdenk		CONFIG_SHARP_LQ64D341
1555c609719bSwdenk
1556c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1557c609719bSwdenk			Active, color, single scan.
1558c609719bSwdenk
1559c609719bSwdenk		CONFIG_HLD1045
1560c609719bSwdenk
1561c609719bSwdenk			HLD1045 display, 640x480.
1562c609719bSwdenk			Active, color, single scan.
1563c609719bSwdenk
1564c609719bSwdenk		CONFIG_OPTREX_BW
1565c609719bSwdenk
1566c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1567c609719bSwdenk			or
1568c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1569c609719bSwdenk			or
1570c609719bSwdenk			Hitachi	 SP14Q002
1571c609719bSwdenk
1572c609719bSwdenk			320x240. Black & white.
1573c609719bSwdenk
1574c609719bSwdenk		Normally display is black on white background; define
15756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1576c609719bSwdenk
1577676d319eSSimon Glass		CONFIG_LCD_ALIGNMENT
1578676d319eSSimon Glass
1579676d319eSSimon Glass		Normally the LCD is page-aligned (tyically 4KB). If this is
1580676d319eSSimon Glass		defined then the LCD will be aligned to this value instead.
1581676d319eSSimon Glass		For ARM it is sometimes useful to use MMU_SECTION_SIZE
1582676d319eSSimon Glass		here, since it is cheaper to change data cache settings on
1583676d319eSSimon Glass		a per-section basis.
1584676d319eSSimon Glass
15850d89efefSSimon Glass		CONFIG_CONSOLE_SCROLL_LINES
15860d89efefSSimon Glass
15870d89efefSSimon Glass		When the console need to be scrolled, this is the number of
15880d89efefSSimon Glass		lines to scroll by. It defaults to 1. Increasing this makes
15890d89efefSSimon Glass		the console jump but can help speed up operation when scrolling
15900d89efefSSimon Glass		is slow.
1591676d319eSSimon Glass
159245d7f525STom Wai-Hong Tam		CONFIG_LCD_BMP_RLE8
159345d7f525STom Wai-Hong Tam
159445d7f525STom Wai-Hong Tam		Support drawing of RLE8-compressed bitmaps on the LCD.
159545d7f525STom Wai-Hong Tam
1596735987c5STom Wai-Hong Tam		CONFIG_I2C_EDID
1597735987c5STom Wai-Hong Tam
1598735987c5STom Wai-Hong Tam		Enables an 'i2c edid' command which can read EDID
1599735987c5STom Wai-Hong Tam		information over I2C from an attached LCD display.
1600735987c5STom Wai-Hong Tam
16017152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1602d791b1dcSwdenk
1603d791b1dcSwdenk		If this option is set, the environment is checked for
1604d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1605d791b1dcSwdenk		of logo, copyright and system information on the LCD
1606e94d2cd9Swdenk		is suppressed and the BMP image at the address
1607d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1608d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1609d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1610d791b1dcSwdenk		loaded very quickly after power-on.
1611d791b1dcSwdenk
1612c0880485SNikita Kiryanov		CONFIG_SPLASHIMAGE_GUARD
1613c0880485SNikita Kiryanov
1614c0880485SNikita Kiryanov		If this option is set, then U-Boot will prevent the environment
1615c0880485SNikita Kiryanov		variable "splashimage" from being set to a problematic address
1616c0880485SNikita Kiryanov		(see README.displaying-bmps and README.arm-unaligned-accesses).
1617c0880485SNikita Kiryanov		This option is useful for targets where, due to alignment
1618c0880485SNikita Kiryanov		restrictions, an improperly aligned BMP image will cause a data
1619c0880485SNikita Kiryanov		abort. If you think you will not have problems with unaligned
1620c0880485SNikita Kiryanov		accesses (for example because your toolchain prevents them)
1621c0880485SNikita Kiryanov		there is no need to set this option.
1622c0880485SNikita Kiryanov
16231ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
16241ca298ceSMatthias Weisser
16251ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
16261ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
16271ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
16281ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
16291ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
16301ca298ceSMatthias Weisser		specify 'm' for centering the image.
16311ca298ceSMatthias Weisser
16321ca298ceSMatthias Weisser		Example:
16331ca298ceSMatthias Weisser		setenv splashpos m,m
16341ca298ceSMatthias Weisser			=> image at center of screen
16351ca298ceSMatthias Weisser
16361ca298ceSMatthias Weisser		setenv splashpos 30,20
16371ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
16381ca298ceSMatthias Weisser
16391ca298ceSMatthias Weisser		setenv splashpos -10,m
16401ca298ceSMatthias Weisser			=> vertically centered image
16411ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
16421ca298ceSMatthias Weisser
1643581bb419SNikita Kiryanov		CONFIG_SPLASH_SCREEN_PREPARE
1644581bb419SNikita Kiryanov
1645581bb419SNikita Kiryanov		If this option is set then the board_splash_screen_prepare()
1646581bb419SNikita Kiryanov		function, which must be defined in your code, is called as part
1647581bb419SNikita Kiryanov		of the splash screen display sequence. It gives the board an
1648581bb419SNikita Kiryanov		opportunity to prepare the splash image data before it is
1649581bb419SNikita Kiryanov		processed and sent to the frame buffer by U-Boot.
1650581bb419SNikita Kiryanov
165198f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
165298f4a3dfSStefan Roese
165398f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
165498f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
165598f4a3dfSStefan Roese		splashscreen support or the bmp command.
165698f4a3dfSStefan Roese
1657d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1658d5011762SAnatolij Gustschin
1659d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1660d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1661d5011762SAnatolij Gustschin		bmp command.
1662d5011762SAnatolij Gustschin
1663f2b96dfbSLei Wen- Do compresssing for memory range:
1664f2b96dfbSLei Wen		CONFIG_CMD_ZIP
1665f2b96dfbSLei Wen
1666f2b96dfbSLei Wen		If this option is set, it would use zlib deflate method
1667f2b96dfbSLei Wen		to compress the specified memory at its best effort.
1668f2b96dfbSLei Wen
1669c29fdfc1Swdenk- Compression support:
1670c29fdfc1Swdenk		CONFIG_BZIP2
1671c29fdfc1Swdenk
1672c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1673c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1674c29fdfc1Swdenk		compressed images are supported.
1675c29fdfc1Swdenk
1676c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
16776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1678c29fdfc1Swdenk		be at least 4MB.
1679d791b1dcSwdenk
1680fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1681fc9c1727SLuigi 'Comio' Mantellini
1682fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1683fc9c1727SLuigi 'Comio' Mantellini		images is included.
1684fc9c1727SLuigi 'Comio' Mantellini
1685fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1686fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1687fc9c1727SLuigi 'Comio' Mantellini		formula:
1688fc9c1727SLuigi 'Comio' Mantellini
1689fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1690fc9c1727SLuigi 'Comio' Mantellini
1691fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1692fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1693fc9c1727SLuigi 'Comio' Mantellini
1694fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1695fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1696fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1697fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1698fc9c1727SLuigi 'Comio' Mantellini
1699fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1700fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
17016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1702fc9c1727SLuigi 'Comio' Mantellini
170317ea1177Swdenk- MII/PHY support:
170417ea1177Swdenk		CONFIG_PHY_ADDR
170517ea1177Swdenk
170617ea1177Swdenk		The address of PHY on MII bus.
170717ea1177Swdenk
170817ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
170917ea1177Swdenk
171017ea1177Swdenk		The clock frequency of the MII bus
171117ea1177Swdenk
171217ea1177Swdenk		CONFIG_PHY_GIGE
171317ea1177Swdenk
171417ea1177Swdenk		If this option is set, support for speed/duplex
171511ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
171617ea1177Swdenk
171717ea1177Swdenk		CONFIG_PHY_RESET_DELAY
171817ea1177Swdenk
171917ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
172017ea1177Swdenk		reset before any MII register access is possible.
172117ea1177Swdenk		For such PHY, set this option to the usec delay
172217ea1177Swdenk		required. (minimum 300usec for LXT971A)
172317ea1177Swdenk
172417ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
172517ea1177Swdenk
172617ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
172717ea1177Swdenk		command issued before MII status register can be read
172817ea1177Swdenk
1729c609719bSwdenk- Ethernet address:
1730c609719bSwdenk		CONFIG_ETHADDR
1731c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1732c609719bSwdenk		CONFIG_ETH2ADDR
1733c609719bSwdenk		CONFIG_ETH3ADDR
1734c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1735c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1736c609719bSwdenk
173711ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
173811ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1739c609719bSwdenk		is not determined automatically.
1740c609719bSwdenk
1741c609719bSwdenk- IP address:
1742c609719bSwdenk		CONFIG_IPADDR
1743c609719bSwdenk
1744c609719bSwdenk		Define a default value for the IP address to use for
174511ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1746c609719bSwdenk		determined through e.g. bootp.
17471ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1748c609719bSwdenk
1749c609719bSwdenk- Server IP address:
1750c609719bSwdenk		CONFIG_SERVERIP
1751c609719bSwdenk
1752c609719bSwdenk		Defines a default value for the IP address of a TFTP
1753c609719bSwdenk		server to contact when using the "tftboot" command.
17541ebcd654SWolfgang Denk		(Environment variable "serverip")
1755c609719bSwdenk
175697cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
175797cfe861SRobin Getz
175897cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
175997cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
176097cfe861SRobin Getz
17611ebcd654SWolfgang Denk- Gateway IP address:
17621ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
17631ebcd654SWolfgang Denk
17641ebcd654SWolfgang Denk		Defines a default value for the IP address of the
17651ebcd654SWolfgang Denk		default router where packets to other networks are
17661ebcd654SWolfgang Denk		sent to.
17671ebcd654SWolfgang Denk		(Environment variable "gatewayip")
17681ebcd654SWolfgang Denk
17691ebcd654SWolfgang Denk- Subnet mask:
17701ebcd654SWolfgang Denk		CONFIG_NETMASK
17711ebcd654SWolfgang Denk
17721ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
17731ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
17741ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
17751ebcd654SWolfgang Denk		forwarded through a router.
17761ebcd654SWolfgang Denk		(Environment variable "netmask")
17771ebcd654SWolfgang Denk
177853a5c424SDavid Updegraff- Multicast TFTP Mode:
177953a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
178053a5c424SDavid Updegraff
178153a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
178253a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
178311ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
178453a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
178553a5c424SDavid Updegraff		multicast group.
178653a5c424SDavid Updegraff
1787c609719bSwdenk- BOOTP Recovery Mode:
1788c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1789c609719bSwdenk
1790c609719bSwdenk		If you have many targets in a network that try to
1791c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1792c609719bSwdenk		systems send out BOOTP requests at precisely the same
1793c609719bSwdenk		moment (which would happen for instance at recovery
1794c609719bSwdenk		from a power failure, when all systems will try to
1795c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1796c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1797c609719bSwdenk		inserted before sending out BOOTP requests. The
17986c33c785SWolfgang Denk		following delays are inserted then:
1799c609719bSwdenk
1800c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1801c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1802c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1803c609719bSwdenk		4th and following
1804c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1805c609719bSwdenk
1806fe389a82Sstroese- DHCP Advanced Options:
18071fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
18081fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1809fe389a82Sstroese
18101fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
18111fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
18121fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
18131fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
18141fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
18151fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
18161fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
18171fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
18181fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
18191fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
18201fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
18211fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
18222c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
1823fe389a82Sstroese
18245d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
18255d110f0aSWilson Callan		environment variable, not the BOOTP server.
1826fe389a82Sstroese
18272c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
18282c00e099SJoe Hershberger		after the configured retry count, the call will fail
18292c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
18302c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
18312c00e099SJoe Hershberger		is not available.
18322c00e099SJoe Hershberger
1833fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1834fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1835fe389a82Sstroese		than one DNS serverip is offered to the client.
1836fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1837fe389a82Sstroese		serverip will be stored in the additional environment
1838fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1839fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
18401fe80d79SJon Loeliger		is defined.
1841fe389a82Sstroese
1842fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1843fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1844fe389a82Sstroese		need the hostname of the DHCP requester.
18455d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
18461fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
18471fe80d79SJon Loeliger		option 12 to the DHCP server.
1848fe389a82Sstroese
1849d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1850d9a2f416SAras Vaichas
1851d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1852d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1853d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1854d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1855d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1856d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1857d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1858d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1859d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1860d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1861d9a2f416SAras Vaichas		this delay.
1862d9a2f416SAras Vaichas
1863d22c338eSJoe Hershberger - Link-local IP address negotiation:
1864d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
1865d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
1866d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
1867d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
1868d22c338eSJoe Hershberger
1869d22c338eSJoe Hershberger		See doc/README.link-local for more information.
1870d22c338eSJoe Hershberger
1871a3d991bdSwdenk - CDP Options:
1872a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1873a3d991bdSwdenk
1874a3d991bdSwdenk		The device id used in CDP trigger frames.
1875a3d991bdSwdenk
1876a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1877a3d991bdSwdenk
1878a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1879a3d991bdSwdenk		of the device.
1880a3d991bdSwdenk
1881a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1882a3d991bdSwdenk
1883a3d991bdSwdenk		A printf format string which contains the ascii name of
1884a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
188511ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1886a3d991bdSwdenk
1887a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1888a3d991bdSwdenk
1889a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1890a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1891a3d991bdSwdenk
1892a3d991bdSwdenk		CONFIG_CDP_VERSION
1893a3d991bdSwdenk
1894a3d991bdSwdenk		An ascii string containing the version of the software.
1895a3d991bdSwdenk
1896a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1897a3d991bdSwdenk
1898a3d991bdSwdenk		An ascii string containing the name of the platform.
1899a3d991bdSwdenk
1900a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1901a3d991bdSwdenk
1902a3d991bdSwdenk		A 32bit integer sent on the trigger.
1903a3d991bdSwdenk
1904a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1905a3d991bdSwdenk
1906a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1907a3d991bdSwdenk		device in .1 of milliwatts.
1908a3d991bdSwdenk
1909a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1910a3d991bdSwdenk
1911a3d991bdSwdenk		A byte containing the id of the VLAN.
1912a3d991bdSwdenk
1913c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1914c609719bSwdenk
1915c609719bSwdenk		Several configurations allow to display the current
1916c609719bSwdenk		status using a LED. For instance, the LED will blink
1917c609719bSwdenk		fast while running U-Boot code, stop blinking as
1918c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1919c609719bSwdenk		start blinking slow once the Linux kernel is running
1920c609719bSwdenk		(supported by a status LED driver in the Linux
1921c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1922c609719bSwdenk		feature in U-Boot.
1923c609719bSwdenk
1924c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1925c609719bSwdenk
1926c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1927c609719bSwdenk		on those systems that support this (optional)
1928c609719bSwdenk		feature, like the TQM8xxL modules.
1929c609719bSwdenk
1930c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1931c609719bSwdenk
1932b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1933b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
193411ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1935c609719bSwdenk
1936b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1937602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1938b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1939b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1940c609719bSwdenk		command line interface.
1941c609719bSwdenk
1942bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1943c609719bSwdenk
1944b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1945b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1946b37c7e5eSwdenk		support for I2C.
1947c609719bSwdenk
1948b37c7e5eSwdenk		There are several other quantities that must also be
1949b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1950c609719bSwdenk
19516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1952b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
19536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
195411ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1955c609719bSwdenk
19568d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
1957a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
19588d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
19598d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
19608d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
1961b37c7e5eSwdenk
19625da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
19635da71efaSEric Millbrandt
19645da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
19655da71efaSEric Millbrandt		chips might think that the current transfer is still
19665da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
19675da71efaSEric Millbrandt		commands until the slave device responds.
19685da71efaSEric Millbrandt
1969b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1970b37c7e5eSwdenk
1971b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1972b37c7e5eSwdenk		then the following macros need to be defined (examples are
1973b37c7e5eSwdenk		from include/configs/lwmon.h):
1974c609719bSwdenk
1975c609719bSwdenk		I2C_INIT
1976c609719bSwdenk
1977b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1978c609719bSwdenk		controller or configure ports.
1979c609719bSwdenk
1980b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1981b37c7e5eSwdenk
1982c609719bSwdenk		I2C_PORT
1983c609719bSwdenk
1984c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1985c609719bSwdenk		assumes both bits are on the same port). Valid values
1986c609719bSwdenk		are 0..3 for ports A..D.
1987c609719bSwdenk
1988c609719bSwdenk		I2C_ACTIVE
1989c609719bSwdenk
1990c609719bSwdenk		The code necessary to make the I2C data line active
1991c609719bSwdenk		(driven).  If the data line is open collector, this
1992c609719bSwdenk		define can be null.
1993c609719bSwdenk
1994b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1995b37c7e5eSwdenk
1996c609719bSwdenk		I2C_TRISTATE
1997c609719bSwdenk
1998c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1999c609719bSwdenk		(inactive).  If the data line is open collector, this
2000c609719bSwdenk		define can be null.
2001c609719bSwdenk
2002b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
2003b37c7e5eSwdenk
2004c609719bSwdenk		I2C_READ
2005c609719bSwdenk
2006472d5460SYork Sun		Code that returns true if the I2C data line is high,
2007472d5460SYork Sun		false if it is low.
2008c609719bSwdenk
2009b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
2010b37c7e5eSwdenk
2011c609719bSwdenk		I2C_SDA(bit)
2012c609719bSwdenk
2013472d5460SYork Sun		If <bit> is true, sets the I2C data line high. If it
2014472d5460SYork Sun		is false, it clears it (low).
2015c609719bSwdenk
2016b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
2017b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
2018b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
2019b37c7e5eSwdenk
2020c609719bSwdenk		I2C_SCL(bit)
2021c609719bSwdenk
2022472d5460SYork Sun		If <bit> is true, sets the I2C clock line high. If it
2023472d5460SYork Sun		is false, it clears it (low).
2024c609719bSwdenk
2025b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
2026b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
2027b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
2028b37c7e5eSwdenk
2029c609719bSwdenk		I2C_DELAY
2030c609719bSwdenk
2031c609719bSwdenk		This delay is invoked four times per clock cycle so this
2032c609719bSwdenk		controls the rate of data transfer.  The data rate thus
2033b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
2034b37c7e5eSwdenk		like:
2035b37c7e5eSwdenk
2036b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
2037c609719bSwdenk
2038793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
2039793b5726SMike Frysinger
2040793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
2041793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
2042793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
2043793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
2044793b5726SMike Frysinger
2045793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
2046793b5726SMike Frysinger		the generic GPIO functions.
2047793b5726SMike Frysinger
20486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
204947cd00faSwdenk
205047cd00faSwdenk		When a board is reset during an i2c bus transfer
205147cd00faSwdenk		chips might think that the current transfer is still
205247cd00faSwdenk		in progress. On some boards it is possible to access
205347cd00faSwdenk		the i2c SCLK line directly, either by using the
205447cd00faSwdenk		processor pin as a GPIO or by having a second pin
205547cd00faSwdenk		connected to the bus. If this option is defined a
205647cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
205747cd00faSwdenk		is run early in the boot sequence.
205847cd00faSwdenk
205926a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
206026a33504SRichard Retanubun
206126a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
206226a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
206326a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
206426a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
206526a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
206626a33504SRichard Retanubun		controller provide such a method. It is called at the end of
206726a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
206826a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
206926a33504SRichard Retanubun
207017ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
207117ea1177Swdenk
207217ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
207317ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
207417ea1177Swdenk		variable "i2cfast". (see also i2cfast)
207517ea1177Swdenk
2076bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
2077bb99ad6dSBen Warren
2078bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
2079bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
2080bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
2081bb99ad6dSBen Warren		Note that bus numbering is zero-based.
2082bb99ad6dSBen Warren
20836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
2084bb99ad6dSBen Warren
2085bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
20860f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
20870f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
20880f89c54bSPeter Tyser		a 1D array of device addresses
2089bb99ad6dSBen Warren
2090bb99ad6dSBen Warren		e.g.
2091bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
20926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
2093bb99ad6dSBen Warren
2094bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
2095bb99ad6dSBen Warren
2096bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
20976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
2098bb99ad6dSBen Warren
2099bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2100bb99ad6dSBen Warren
21016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
2102be5e6181STimur Tabi
2103be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
2104be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2105be5e6181STimur Tabi
21066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
21070dc018ecSStefan Roese
21080dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
21090dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
21100dc018ecSStefan Roese
21116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
21120dc018ecSStefan Roese
21130dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
21140dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
21150dc018ecSStefan Roese
21166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
21179ebbb54fSVictor Gallardo
21189ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
21199ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
21209ebbb54fSVictor Gallardo		specified DTT device.
21219ebbb54fSVictor Gallardo
2122be5e6181STimur Tabi		CONFIG_FSL_I2C
2123be5e6181STimur Tabi
2124be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
21257817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
2126be5e6181STimur Tabi
212767b23a32SHeiko Schocher		CONFIG_I2C_MUX
212867b23a32SHeiko Schocher
212967b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
213067b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
213167b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
213267b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
213367b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
213467b23a32SHeiko Schocher		the muxes to activate this new "bus".
213567b23a32SHeiko Schocher
213667b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
213767b23a32SHeiko Schocher		feature!
213867b23a32SHeiko Schocher
213967b23a32SHeiko Schocher		Example:
214067b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
214167b23a32SHeiko Schocher			The First mux with address 70 and channel 6
214267b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
214367b23a32SHeiko Schocher
214467b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
214567b23a32SHeiko Schocher
214667b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
214767b23a32SHeiko Schocher		of I2C Busses with muxes:
214867b23a32SHeiko Schocher
214967b23a32SHeiko Schocher		=> i2c bus
215067b23a32SHeiko Schocher		Busses reached over muxes:
215167b23a32SHeiko Schocher		Bus ID: 2
215267b23a32SHeiko Schocher		  reached over Mux(es):
215367b23a32SHeiko Schocher		    pca9544a@70 ch: 4
215467b23a32SHeiko Schocher		Bus ID: 3
215567b23a32SHeiko Schocher		  reached over Mux(es):
215667b23a32SHeiko Schocher		    pca9544a@70 ch: 6
215767b23a32SHeiko Schocher		    pca9544a@71 ch: 4
215867b23a32SHeiko Schocher		=>
215967b23a32SHeiko Schocher
216067b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
2161f9a78b8dSMichael Jones		u-boot first sends the command to the mux@70 to enable
2162f9a78b8dSMichael Jones		channel 6, and then the command to the mux@71 to enable
216367b23a32SHeiko Schocher		the channel 4.
216467b23a32SHeiko Schocher
216567b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
2166f9a78b8dSMichael Jones		usual to communicate with your I2C devices behind
216767b23a32SHeiko Schocher		the 2 muxes.
216867b23a32SHeiko Schocher
216967b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
217067b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
217167b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
217267b23a32SHeiko Schocher		to add this option to other architectures.
217367b23a32SHeiko Schocher
21742ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
21752ac6985aSAndrew Dyer
21762ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
21772ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
21782ac6985aSAndrew Dyer		between writing the address pointer and reading the
21792ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
21802ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
21812ac6985aSAndrew Dyer		devices can use either method, but some require one or
21822ac6985aSAndrew Dyer		the other.
2183be5e6181STimur Tabi
2184c609719bSwdenk- SPI Support:	CONFIG_SPI
2185c609719bSwdenk
2186c609719bSwdenk		Enables SPI driver (so far only tested with
2187c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
2188c609719bSwdenk		D/As on the SACSng board)
2189c609719bSwdenk
21906639562eSYoshihiro Shimoda		CONFIG_SH_SPI
21916639562eSYoshihiro Shimoda
21926639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
21936639562eSYoshihiro Shimoda		only SH7757 is supported.
21946639562eSYoshihiro Shimoda
2195c609719bSwdenk		CONFIG_SPI_X
2196c609719bSwdenk
2197c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
2198c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
2199c609719bSwdenk
2200c609719bSwdenk		CONFIG_SOFT_SPI
2201c609719bSwdenk
2202c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
2203c609719bSwdenk		using hardware support. This is a general purpose
2204c609719bSwdenk		driver that only requires three general I/O port pins
2205c609719bSwdenk		(two outputs, one input) to function. If this is
2206c609719bSwdenk		defined, the board configuration must define several
2207c609719bSwdenk		SPI configuration items (port pins to use, etc). For
2208c609719bSwdenk		an example, see include/configs/sacsng.h.
2209c609719bSwdenk
221004a9e118SBen Warren		CONFIG_HARD_SPI
221104a9e118SBen Warren
221204a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
221304a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
221404a9e118SBen Warren		must define a list of chip-select function pointers.
221504a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
221604a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
221704a9e118SBen Warren
221838254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
221938254f45SGuennadi Liakhovetski
222038254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
22212e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
222238254f45SGuennadi Liakhovetski
22230133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
22240133502eSMatthias Fuchs
22250133502eSMatthias Fuchs		Enables FPGA subsystem.
22260133502eSMatthias Fuchs
22270133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
22280133502eSMatthias Fuchs
22290133502eSMatthias Fuchs		Enables support for specific chip vendors.
22300133502eSMatthias Fuchs		(ALTERA, XILINX)
22310133502eSMatthias Fuchs
22320133502eSMatthias Fuchs		CONFIG_FPGA_<family>
22330133502eSMatthias Fuchs
22340133502eSMatthias Fuchs		Enables support for FPGA family.
22350133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
22360133502eSMatthias Fuchs
22370133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2238c609719bSwdenk
2239c609719bSwdenk		Specify the number of FPGA devices to support.
2240c609719bSwdenk
22416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2242c609719bSwdenk
2243c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2244c609719bSwdenk
22456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2246c609719bSwdenk
2247c609719bSwdenk		Enable checks on FPGA configuration interface busy
2248c609719bSwdenk		status by the configuration function. This option
2249c609719bSwdenk		will require a board or device specific function to
2250c609719bSwdenk		be written.
2251c609719bSwdenk
2252c609719bSwdenk		CONFIG_FPGA_DELAY
2253c609719bSwdenk
2254c609719bSwdenk		If defined, a function that provides delays in the FPGA
2255c609719bSwdenk		configuration driver.
2256c609719bSwdenk
22576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2258c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2259c609719bSwdenk
22606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2261c609719bSwdenk
2262c609719bSwdenk		Check for configuration errors during FPGA bitfile
2263c609719bSwdenk		loading. For example, abort during Virtex II
2264c609719bSwdenk		configuration if the INIT_B line goes low (which
2265c609719bSwdenk		indicated a CRC error).
2266c609719bSwdenk
22676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2268c609719bSwdenk
2269c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2270c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2271c609719bSwdenk		FPGA configuration sequence. The default time is 500
227211ccc33fSMarcel Ziswiler		ms.
2273c609719bSwdenk
22746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2275c609719bSwdenk
2276c609719bSwdenk		Maximum time to wait for BUSY to deassert during
227711ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2278c609719bSwdenk
22796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2280c609719bSwdenk
2281c609719bSwdenk		Time to wait after FPGA configuration. The default is
228211ccc33fSMarcel Ziswiler		200 ms.
2283c609719bSwdenk
2284c609719bSwdenk- Configuration Management:
2285c609719bSwdenk		CONFIG_IDENT_STRING
2286c609719bSwdenk
2287c609719bSwdenk		If defined, this string will be added to the U-Boot
2288c609719bSwdenk		version information (U_BOOT_VERSION)
2289c609719bSwdenk
2290c609719bSwdenk- Vendor Parameter Protection:
2291c609719bSwdenk
2292c609719bSwdenk		U-Boot considers the values of the environment
2293c609719bSwdenk		variables "serial#" (Board Serial Number) and
22947152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2295c609719bSwdenk		are set once by the board vendor / manufacturer, and
2296c609719bSwdenk		protects these variables from casual modification by
2297c609719bSwdenk		the user. Once set, these variables are read-only,
2298c609719bSwdenk		and write or delete attempts are rejected. You can
229911ccc33fSMarcel Ziswiler		change this behaviour:
2300c609719bSwdenk
2301c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2302c609719bSwdenk		file, the write protection for vendor parameters is
230347cd00faSwdenk		completely disabled. Anybody can change or delete
2304c609719bSwdenk		these parameters.
2305c609719bSwdenk
2306c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2307c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
230811ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2309c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2310c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2311c609719bSwdenk		read-only.]
2312c609719bSwdenk
23132598090bSJoe Hershberger		The same can be accomplished in a more flexible way
23142598090bSJoe Hershberger		for any variable by configuring the type of access
23152598090bSJoe Hershberger		to allow for those variables in the ".flags" variable
23162598090bSJoe Hershberger		or define CONFIG_ENV_FLAGS_LIST_STATIC.
23172598090bSJoe Hershberger
2318c609719bSwdenk- Protected RAM:
2319c609719bSwdenk		CONFIG_PRAM
2320c609719bSwdenk
2321c609719bSwdenk		Define this variable to enable the reservation of
2322c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2323c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2324c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2325c609719bSwdenk		this default value by defining an environment
2326c609719bSwdenk		variable "pram" to the number of kB you want to
2327c609719bSwdenk		reserve. Note that the board info structure will
2328c609719bSwdenk		still show the full amount of RAM. If pRAM is
2329c609719bSwdenk		reserved, a new environment variable "mem" will
2330c609719bSwdenk		automatically be defined to hold the amount of
2331c609719bSwdenk		remaining RAM in a form that can be passed as boot
2332c609719bSwdenk		argument to Linux, for instance like that:
2333c609719bSwdenk
2334fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2335c609719bSwdenk			saveenv
2336c609719bSwdenk
2337c609719bSwdenk		This way you can tell Linux not to use this memory,
2338c609719bSwdenk		either, which results in a memory region that will
2339c609719bSwdenk		not be affected by reboots.
2340c609719bSwdenk
2341c609719bSwdenk		*WARNING* If your board configuration uses automatic
2342c609719bSwdenk		detection of the RAM size, you must make sure that
2343c609719bSwdenk		this memory test is non-destructive. So far, the
2344c609719bSwdenk		following board configurations are known to be
2345c609719bSwdenk		"pRAM-clean":
2346c609719bSwdenk
23471b0757ecSWolfgang Denk			IVMS8, IVML24, SPD8xx, TQM8xxL,
23481b0757ecSWolfgang Denk			HERMES, IP860, RPXlite, LWMON,
2349544d97e9SWolfgang Denk			FLAGADM, TQM8260
2350c609719bSwdenk
235140fef049SGabe Black- Access to physical memory region (> 4GB)
235240fef049SGabe Black		Some basic support is provided for operations on memory not
235340fef049SGabe Black		normally accessible to U-Boot - e.g. some architectures
235440fef049SGabe Black		support access to more than 4GB of memory on 32-bit
235540fef049SGabe Black		machines using physical address extension or similar.
235640fef049SGabe Black		Define CONFIG_PHYSMEM to access this basic support, which
235740fef049SGabe Black		currently only supports clearing the memory.
235840fef049SGabe Black
2359c609719bSwdenk- Error Recovery:
2360c609719bSwdenk		CONFIG_PANIC_HANG
2361c609719bSwdenk
2362c609719bSwdenk		Define this variable to stop the system in case of a
2363c609719bSwdenk		fatal error, so that you have to reset it manually.
2364c609719bSwdenk		This is probably NOT a good idea for an embedded
236511ccc33fSMarcel Ziswiler		system where you want the system to reboot
2366c609719bSwdenk		automatically as fast as possible, but it may be
2367c609719bSwdenk		useful during development since you can try to debug
2368c609719bSwdenk		the conditions that lead to the situation.
2369c609719bSwdenk
2370c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2371c609719bSwdenk
2372c609719bSwdenk		This variable defines the number of retries for
2373c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2374c609719bSwdenk		before giving up the operation. If not defined, a
2375c609719bSwdenk		default value of 5 is used.
2376c609719bSwdenk
237740cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
237840cb90eeSGuennadi Liakhovetski
237940cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
238040cb90eeSGuennadi Liakhovetski
238148a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
238248a3e999STetsuyuki Kobayashi
238348a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
238448a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
238548a3e999STetsuyuki Kobayashi		try longer timeout such as
238648a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
238748a3e999STetsuyuki Kobayashi
2388c609719bSwdenk- Command Interpreter:
23898078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
239004a85b3bSwdenk
239104a85b3bSwdenk		Enable auto completion of commands using TAB.
239204a85b3bSwdenk
23938078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
23948078f1a5SWolfgang Denk		for the "hush" shell.
23958078f1a5SWolfgang Denk
23968078f1a5SWolfgang Denk
23976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2398c609719bSwdenk
2399c609719bSwdenk		Define this variable to enable the "hush" shell (from
2400c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2401c609719bSwdenk		powerful command line syntax like
2402c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2403c609719bSwdenk		constructs ("shell scripts").
2404c609719bSwdenk
2405c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2406c609719bSwdenk		with a somewhat smaller memory footprint.
2407c609719bSwdenk
2408c609719bSwdenk
24096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2410c609719bSwdenk
2411c609719bSwdenk		This defines the secondary prompt string, which is
2412c609719bSwdenk		printed when the command interpreter needs more input
2413c609719bSwdenk		to complete a command. Usually "> ".
2414c609719bSwdenk
2415c609719bSwdenk	Note:
2416c609719bSwdenk
2417c609719bSwdenk		In the current implementation, the local variables
2418c609719bSwdenk		space and global environment variables space are
2419c609719bSwdenk		separated. Local variables are those you define by
24203b57fe0aSwdenk		simply typing `name=value'. To access a local
2421c609719bSwdenk		variable later on, you have write `$name' or
24223b57fe0aSwdenk		`${name}'; to execute the contents of a variable
24233b57fe0aSwdenk		directly type `$name' at the command prompt.
2424c609719bSwdenk
2425c609719bSwdenk		Global environment variables are those you use
2426c609719bSwdenk		setenv/printenv to work with. To run a command stored
2427c609719bSwdenk		in such a variable, you need to use the run command,
2428c609719bSwdenk		and you must not use the '$' sign to access them.
2429c609719bSwdenk
2430c609719bSwdenk		To store commands and special characters in a
2431c609719bSwdenk		variable, please use double quotation marks
2432c609719bSwdenk		surrounding the whole text of the variable, instead
2433c609719bSwdenk		of the backslashes before semicolons and special
2434c609719bSwdenk		symbols.
2435c609719bSwdenk
2436aa0c71acSWolfgang Denk- Commandline Editing and History:
2437aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2438aa0c71acSWolfgang Denk
243911ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2440aa0c71acSWolfgang Denk		commandline input operations
2441aa0c71acSWolfgang Denk
2442a8c7c708Swdenk- Default Environment:
2443c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2444c609719bSwdenk
2445c609719bSwdenk		Define this to contain any number of null terminated
2446c609719bSwdenk		strings (variable = value pairs) that will be part of
24477152b1d0Swdenk		the default environment compiled into the boot image.
24482262cfeeSwdenk
2449c609719bSwdenk		For example, place something like this in your
2450c609719bSwdenk		board's config file:
2451c609719bSwdenk
2452c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2453c609719bSwdenk			"myvar1=value1\0" \
2454c609719bSwdenk			"myvar2=value2\0"
2455c609719bSwdenk
2456c609719bSwdenk		Warning: This method is based on knowledge about the
2457c609719bSwdenk		internal format how the environment is stored by the
24582262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2459c609719bSwdenk		interface! Although it is unlikely that this format
24607152b1d0Swdenk		will change soon, there is no guarantee either.
2461c609719bSwdenk		You better know what you are doing here.
2462c609719bSwdenk
2463c609719bSwdenk		Note: overly (ab)use of the default environment is
2464c609719bSwdenk		discouraged. Make sure to check other ways to preset
246574de7aefSWolfgang Denk		the environment like the "source" command or the
2466c609719bSwdenk		boot command first.
2467c609719bSwdenk
24685e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
24695e724ca2SStephen Warren
24705e724ca2SStephen Warren		Define this in order to add variables describing the
24715e724ca2SStephen Warren		U-Boot build configuration to the default environment.
24725e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
24735e724ca2SStephen Warren
24745e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
24755e724ca2SStephen Warren
24765e724ca2SStephen Warren		- CONFIG_SYS_ARCH
24775e724ca2SStephen Warren		- CONFIG_SYS_CPU
24785e724ca2SStephen Warren		- CONFIG_SYS_BOARD
24795e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
24805e724ca2SStephen Warren		- CONFIG_SYS_SOC
24815e724ca2SStephen Warren
24827e27f89fSTom Rini		CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
24837e27f89fSTom Rini
24847e27f89fSTom Rini		Define this in order to add variables describing certain
24857e27f89fSTom Rini		run-time determined information about the hardware to the
24867e27f89fSTom Rini		environment.  These will be named board_name, board_rev.
24877e27f89fSTom Rini
248806fd8538SSimon Glass		CONFIG_DELAY_ENVIRONMENT
248906fd8538SSimon Glass
249006fd8538SSimon Glass		Normally the environment is loaded when the board is
249106fd8538SSimon Glass		intialised so that it is available to U-Boot. This inhibits
249206fd8538SSimon Glass		that so that the environment is not available until
249306fd8538SSimon Glass		explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
249406fd8538SSimon Glass		this is instead controlled by the value of
249506fd8538SSimon Glass		/config/load-environment.
249606fd8538SSimon Glass
2497a8c7c708Swdenk- DataFlash Support:
24982abbe075Swdenk		CONFIG_HAS_DATAFLASH
24992abbe075Swdenk
25002abbe075Swdenk		Defining this option enables DataFlash features and
25012abbe075Swdenk		allows to read/write in Dataflash via the standard
25022abbe075Swdenk		commands cp, md...
25032abbe075Swdenk
2504f61ec45eSEric Nelson- Serial Flash support
2505f61ec45eSEric Nelson		CONFIG_CMD_SF
2506f61ec45eSEric Nelson
2507f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2508f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2509f61ec45eSEric Nelson
2510f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2511f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2512f61ec45eSEric Nelson		commands.
2513f61ec45eSEric Nelson
2514f61ec45eSEric Nelson		The following defaults may be provided by the platform
2515f61ec45eSEric Nelson		to handle the common case when only a single serial
2516f61ec45eSEric Nelson		flash is present on the system.
2517f61ec45eSEric Nelson
2518f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2519f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2520f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2521f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2522f61ec45eSEric Nelson
252324007273SSimon Glass		CONFIG_CMD_SF_TEST
252424007273SSimon Glass
252524007273SSimon Glass		Define this option to include a destructive SPI flash
252624007273SSimon Glass		test ('sf test').
252724007273SSimon Glass
25281dcd6d03SJagannadha Sutradharudu Teki		CONFIG_SPI_FLASH_BAR		Ban/Extended Addr Reg
25291dcd6d03SJagannadha Sutradharudu Teki
25301dcd6d03SJagannadha Sutradharudu Teki		Define this option to use the Bank addr/Extended addr
25311dcd6d03SJagannadha Sutradharudu Teki		support on SPI flashes which has size > 16Mbytes.
25321dcd6d03SJagannadha Sutradharudu Teki
25333f85ce27Swdenk- SystemACE Support:
25343f85ce27Swdenk		CONFIG_SYSTEMACE
25353f85ce27Swdenk
25363f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
25373f85ce27Swdenk		chips attached via some sort of local bus. The address
253811ccc33fSMarcel Ziswiler		of the chip must also be defined in the
25396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
25403f85ce27Swdenk
25413f85ce27Swdenk		#define CONFIG_SYSTEMACE
25426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
25433f85ce27Swdenk
25443f85ce27Swdenk		When SystemACE support is added, the "ace" device type
25453f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
25463f85ce27Swdenk
2547ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2548ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2549ecb0ccd9SWolfgang Denk
255028cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2551ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
255228cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2553ecb0ccd9SWolfgang Denk		number generator is used.
2554ecb0ccd9SWolfgang Denk
255528cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
255628cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
255728cb9375SWolfgang Denk		defined, the normal port 69 is used.
255828cb9375SWolfgang Denk
255928cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2560ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2561ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2562ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2563ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2564ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2565ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2566ecb0ccd9SWolfgang Denk
2567bf36c5d5SSimon Glass- Hashing support:
2568bf36c5d5SSimon Glass		CONFIG_CMD_HASH
2569bf36c5d5SSimon Glass
2570bf36c5d5SSimon Glass		This enables a generic 'hash' command which can produce
2571bf36c5d5SSimon Glass		hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2572bf36c5d5SSimon Glass
2573bf36c5d5SSimon Glass		CONFIG_HASH_VERIFY
2574bf36c5d5SSimon Glass
2575bf36c5d5SSimon Glass		Enable the hash verify command (hash -v). This adds to code
2576bf36c5d5SSimon Glass		size a little.
2577bf36c5d5SSimon Glass
2578bf36c5d5SSimon Glass		CONFIG_SHA1 - support SHA1 hashing
2579bf36c5d5SSimon Glass		CONFIG_SHA256 - support SHA256 hashing
2580bf36c5d5SSimon Glass
2581bf36c5d5SSimon Glass		Note: There is also a sha1sum command, which should perhaps
2582bf36c5d5SSimon Glass		be deprecated in favour of 'hash sha1'.
2583bf36c5d5SSimon Glass
2584*19c402afSSimon Glass- Signing support:
2585*19c402afSSimon Glass		CONFIG_RSA
2586*19c402afSSimon Glass
2587*19c402afSSimon Glass		This enables the RSA algorithm used for FIT image verification
2588*19c402afSSimon Glass		in U-Boot. See doc/uImage/signature for more information.
2589*19c402afSSimon Glass
2590*19c402afSSimon Glass		The signing part is build into mkimage regardless of this
2591*19c402afSSimon Glass		option.
2592*19c402afSSimon Glass
2593*19c402afSSimon Glass
2594a8c7c708Swdenk- Show boot progress:
2595c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2596c609719bSwdenk
2597c609719bSwdenk		Defining this option allows to add some board-
2598c609719bSwdenk		specific code (calling a user-provided function
2599c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2600c609719bSwdenk		the system's boot progress on some display (for
2601c609719bSwdenk		example, some LED's) on your board. At the moment,
2602c609719bSwdenk		the following checkpoints are implemented:
2603c609719bSwdenk
26043a608ca0SSimon Glass- Detailed boot stage timing
26053a608ca0SSimon Glass		CONFIG_BOOTSTAGE
26063a608ca0SSimon Glass		Define this option to get detailed timing of each stage
26073a608ca0SSimon Glass		of the boot process.
26083a608ca0SSimon Glass
26093a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
26103a608ca0SSimon Glass		This is the number of available user bootstage records.
26113a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
26123a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
26133a608ca0SSimon Glass		the limit, recording will stop.
26143a608ca0SSimon Glass
26153a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
26163a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
26173a608ca0SSimon Glass
26183a608ca0SSimon Glass		Timer summary in microseconds:
26193a608ca0SSimon Glass		       Mark    Elapsed  Stage
26203a608ca0SSimon Glass			  0          0  reset
26213a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
26223a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
26233a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
26243a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
26253a608ca0SSimon Glass		  3,910,375    250,777  main_loop
26263a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
26273a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
26283a608ca0SSimon Glass
26292eba38cfSSimon Glass		CONFIG_CMD_BOOTSTAGE
26302eba38cfSSimon Glass		Add a 'bootstage' command which supports printing a report
26312eba38cfSSimon Glass		and un/stashing of bootstage data.
26322eba38cfSSimon Glass
263394fd1316SSimon Glass		CONFIG_BOOTSTAGE_FDT
263494fd1316SSimon Glass		Stash the bootstage information in the FDT. A root 'bootstage'
263594fd1316SSimon Glass		node is created with each bootstage id as a child. Each child
263694fd1316SSimon Glass		has a 'name' property and either 'mark' containing the
263794fd1316SSimon Glass		mark time in microsecond, or 'accum' containing the
263894fd1316SSimon Glass		accumulated time for that bootstage id in microseconds.
263994fd1316SSimon Glass		For example:
264094fd1316SSimon Glass
264194fd1316SSimon Glass		bootstage {
264294fd1316SSimon Glass			154 {
264394fd1316SSimon Glass				name = "board_init_f";
264494fd1316SSimon Glass				mark = <3575678>;
264594fd1316SSimon Glass			};
264694fd1316SSimon Glass			170 {
264794fd1316SSimon Glass				name = "lcd";
264894fd1316SSimon Glass				accum = <33482>;
264994fd1316SSimon Glass			};
265094fd1316SSimon Glass		};
265194fd1316SSimon Glass
265294fd1316SSimon Glass		Code in the Linux kernel can find this in /proc/devicetree.
265394fd1316SSimon Glass
26541372cce2SMarian BalakowiczLegacy uImage format:
26551372cce2SMarian Balakowicz
2656c609719bSwdenk  Arg	Where			When
2657c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2658c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2659c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2660c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2661c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2662c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2663c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2664c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2665c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
26661372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2667c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2668c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2669c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2670c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
26711372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2672c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
26731372cce2SMarian Balakowicz
26741372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
26751372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
26761372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
26771372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
26781372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
26791372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
26801372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
268111ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
26821372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
26831372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
26841372cce2SMarian Balakowicz
2685ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2686c609719bSwdenk
2687a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
268863e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
268963e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
269063e73c9aSwdenk
2691566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2692566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2693566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2694566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2695566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2696566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2697566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2698566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2699566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2700566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2701566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2702566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2703566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2704566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2705566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2706566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2707566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2708566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2709566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2710566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2711566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2712566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2713566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2714566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2715566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2716566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2717566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2718566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2719566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2720566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2721566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2722566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2723566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2724566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2725566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2726566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2727566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2728566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2729566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2730566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2731566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2732566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2733566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2734566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2735566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2736566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2737566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2738c609719bSwdenk
2739566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2740c609719bSwdenk
2741566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2742566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2743566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2744206c60cbSwdenk
2745566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2746566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
274711ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2748566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2749566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2750566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
275174de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
275274de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2753566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2754c609719bSwdenk
27551372cce2SMarian BalakowiczFIT uImage format:
27561372cce2SMarian Balakowicz
27571372cce2SMarian Balakowicz  Arg	Where			When
27581372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
27591372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
27601372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
27611372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
27621372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
27631372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2764f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
27651372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
27661372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
27671372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
27681372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
27691372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
277011ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
277111ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
27721372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
27731372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
27741372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
27751372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
27761372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
27771372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
27781372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
27791372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
27801372cce2SMarian Balakowicz
27811372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
27821372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
27831372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
278411ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
27851372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
27861372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
27871372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
27881372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
27891372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
27901372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
27911372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
27921372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
27931372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
27941372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
27951372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
27961372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
27971372cce2SMarian Balakowicz
279811ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
27991372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
28001372cce2SMarian Balakowicz
280111ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
28021372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
28031372cce2SMarian Balakowicz
280411ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
28051372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
28061372cce2SMarian Balakowicz
2807d95f6ec7SGabe Black- FIT image support:
2808d95f6ec7SGabe Black		CONFIG_FIT
2809d95f6ec7SGabe Black		Enable support for the FIT uImage format.
2810d95f6ec7SGabe Black
2811d95f6ec7SGabe Black		CONFIG_FIT_BEST_MATCH
2812d95f6ec7SGabe Black		When no configuration is explicitly selected, default to the
2813d95f6ec7SGabe Black		one whose fdt's compatibility field best matches that of
2814d95f6ec7SGabe Black		U-Boot itself. A match is considered "best" if it matches the
2815d95f6ec7SGabe Black		most specific compatibility entry of U-Boot's fdt's root node.
2816d95f6ec7SGabe Black		The order of entries in the configuration's fdt is ignored.
2817d95f6ec7SGabe Black
28183e569a6bSSimon Glass		CONFIG_FIT_SIGNATURE
28193e569a6bSSimon Glass		This option enables signature verification of FIT uImages,
28203e569a6bSSimon Glass		using a hash signed and verified using RSA. See
28213e569a6bSSimon Glass		doc/uImage.FIT/signature.txt for more details.
28223e569a6bSSimon Glass
28234cf2609bSWolfgang Denk- Standalone program support:
28244cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
28254cf2609bSWolfgang Denk
28266feff899SWolfgang Denk		This option defines a board specific value for the
28276feff899SWolfgang Denk		address where standalone program gets loaded, thus
28286feff899SWolfgang Denk		overwriting the architecture dependent default
28294cf2609bSWolfgang Denk		settings.
28304cf2609bSWolfgang Denk
28314cf2609bSWolfgang Denk- Frame Buffer Address:
28324cf2609bSWolfgang Denk		CONFIG_FB_ADDR
28334cf2609bSWolfgang Denk
28344cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
283544a53b57SWolfgang Denk		address for frame buffer.  This is typically the case
283644a53b57SWolfgang Denk		when using a graphics controller has separate video
283744a53b57SWolfgang Denk		memory.  U-Boot will then place the frame buffer at
283844a53b57SWolfgang Denk		the given address instead of dynamically reserving it
283944a53b57SWolfgang Denk		in system RAM by calling lcd_setmem(), which grabs
284044a53b57SWolfgang Denk		the memory for the frame buffer depending on the
284144a53b57SWolfgang Denk		configured panel size.
28424cf2609bSWolfgang Denk
28434cf2609bSWolfgang Denk		Please see board_init_f function.
28444cf2609bSWolfgang Denk
2845cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2846cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2847cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2848cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2849cccfc2abSDetlev Zundel
2850cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2851cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2852cccfc2abSDetlev Zundel
2853cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2854cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2855cccfc2abSDetlev Zundel
2856cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2857cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2858cccfc2abSDetlev Zundel
2859cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2860cccfc2abSDetlev Zundel
2861cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2862cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2863cccfc2abSDetlev Zundel
286470c219cdSJoe Hershberger- UBI support
286570c219cdSJoe Hershberger		CONFIG_CMD_UBI
286670c219cdSJoe Hershberger
286770c219cdSJoe Hershberger		Adds commands for interacting with MTD partitions formatted
286870c219cdSJoe Hershberger		with the UBI flash translation layer
286970c219cdSJoe Hershberger
287070c219cdSJoe Hershberger		Requires also defining CONFIG_RBTREE
287170c219cdSJoe Hershberger
2872147162daSJoe Hershberger		CONFIG_UBI_SILENCE_MSG
2873147162daSJoe Hershberger
2874147162daSJoe Hershberger		Make the verbose messages from UBI stop printing.  This leaves
2875147162daSJoe Hershberger		warnings and errors enabled.
2876147162daSJoe Hershberger
287770c219cdSJoe Hershberger- UBIFS support
287870c219cdSJoe Hershberger		CONFIG_CMD_UBIFS
287970c219cdSJoe Hershberger
288070c219cdSJoe Hershberger		Adds commands for interacting with UBI volumes formatted as
288170c219cdSJoe Hershberger		UBIFS.  UBIFS is read-only in u-boot.
288270c219cdSJoe Hershberger
288370c219cdSJoe Hershberger		Requires UBI support as well as CONFIG_LZO
288470c219cdSJoe Hershberger
2885147162daSJoe Hershberger		CONFIG_UBIFS_SILENCE_MSG
2886147162daSJoe Hershberger
2887147162daSJoe Hershberger		Make the verbose messages from UBIFS stop printing.  This leaves
2888147162daSJoe Hershberger		warnings and errors enabled.
2889147162daSJoe Hershberger
28906a11cf48SDaniel Schwierzeck- SPL framework
28916a11cf48SDaniel Schwierzeck		CONFIG_SPL
28926a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
28936a11cf48SDaniel Schwierzeck
289495579793STom Rini		CONFIG_SPL_LDSCRIPT
289595579793STom Rini		LDSCRIPT for linking the SPL binary.
289695579793STom Rini
28976ebc3461SAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT
28986ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL, BSS included.
28996ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory
29006ebc3461SAlbert ARIBAUD		used by SPL from _start to __bss_end does not exceed it.
29018960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
29026ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
29036ebc3461SAlbert ARIBAUD
290495579793STom Rini		CONFIG_SPL_MAX_SIZE
29056ebc3461SAlbert ARIBAUD		Maximum size of the SPL image (text, data, rodata, and
29066ebc3461SAlbert ARIBAUD		linker lists sections), BSS excluded.
29076ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual size does
29086ebc3461SAlbert ARIBAUD		not exceed it.
290995579793STom Rini
29106a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
29116a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
29126a11cf48SDaniel Schwierzeck
291394a45bb1SScott Wood		CONFIG_SPL_RELOC_TEXT_BASE
291494a45bb1SScott Wood		Address to relocate to.  If unspecified, this is equal to
291594a45bb1SScott Wood		CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
291694a45bb1SScott Wood
291795579793STom Rini		CONFIG_SPL_BSS_START_ADDR
291895579793STom Rini		Link address for the BSS within the SPL binary.
291995579793STom Rini
292095579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
29216ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL BSS.
29226ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory used
29236ebc3461SAlbert ARIBAUD		by SPL from __bss_start to __bss_end does not exceed it.
29248960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
29256ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
292695579793STom Rini
292795579793STom Rini		CONFIG_SPL_STACK
292895579793STom Rini		Adress of the start of the stack SPL will use
292995579793STom Rini
293094a45bb1SScott Wood		CONFIG_SPL_RELOC_STACK
293194a45bb1SScott Wood		Adress of the start of the stack SPL will use after
293294a45bb1SScott Wood		relocation.  If unspecified, this is equal to
293394a45bb1SScott Wood		CONFIG_SPL_STACK.
293494a45bb1SScott Wood
293595579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
293695579793STom Rini		Starting address of the malloc pool used in SPL.
293795579793STom Rini
293895579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
293995579793STom Rini		The size of the malloc pool used in SPL.
29406a11cf48SDaniel Schwierzeck
294147f7bcaeSTom Rini		CONFIG_SPL_FRAMEWORK
294247f7bcaeSTom Rini		Enable the SPL framework under common/.  This framework
294347f7bcaeSTom Rini		supports MMC, NAND and YMODEM loading of U-Boot and NAND
294447f7bcaeSTom Rini		NAND loading of the Linux Kernel.
294547f7bcaeSTom Rini
2946861a86f4STom Rini		CONFIG_SPL_DISPLAY_PRINT
2947861a86f4STom Rini		For ARM, enable an optional function to print more information
2948861a86f4STom Rini		about the running system.
2949861a86f4STom Rini
29504b919725SScott Wood		CONFIG_SPL_INIT_MINIMAL
29514b919725SScott Wood		Arch init code should be built for a very small image
29524b919725SScott Wood
29536a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
29546a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
29556a11cf48SDaniel Schwierzeck
29566a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
29576a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
29586a11cf48SDaniel Schwierzeck
29596a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
29606a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
29616a11cf48SDaniel Schwierzeck
29626a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
29636a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
29646a11cf48SDaniel Schwierzeck
29656a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
29666a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
29676a11cf48SDaniel Schwierzeck
296895579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
296995579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
297095579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
297195579793STom Rini		Address, size and partition on the MMC to load U-Boot from
297295579793STom Rini		when the MMC is being used in raw mode.
297395579793STom Rini
29742b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
29752b75b0adSPeter Korsgaard		Sector to load kernel uImage from when MMC is being
29762b75b0adSPeter Korsgaard		used in raw mode (for Falcon mode)
29772b75b0adSPeter Korsgaard
29782b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR,
29792b75b0adSPeter Korsgaard		CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS
29802b75b0adSPeter Korsgaard		Sector and number of sectors to load kernel argument
29812b75b0adSPeter Korsgaard		parameters from when MMC is being used in raw mode
29822b75b0adSPeter Korsgaard		(for falcon mode)
29832b75b0adSPeter Korsgaard
298495579793STom Rini		CONFIG_SPL_FAT_SUPPORT
298595579793STom Rini		Support for fs/fat/libfat.o in SPL binary
298695579793STom Rini
298795579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
298895579793STom Rini		Filename to read to load U-Boot when reading from FAT
298995579793STom Rini
29907ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_KERNEL_NAME
29917ad2cc79SPeter Korsgaard		Filename to read to load kernel uImage when reading
29927ad2cc79SPeter Korsgaard		from FAT (for Falcon mode)
29937ad2cc79SPeter Korsgaard
29947ad2cc79SPeter Korsgaard		CONFIG_SPL_FAT_LOAD_ARGS_NAME
29957ad2cc79SPeter Korsgaard		Filename to read to load kernel argument parameters
29967ad2cc79SPeter Korsgaard		when reading from FAT (for Falcon mode)
29977ad2cc79SPeter Korsgaard
299806f60ae3SScott Wood		CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
299906f60ae3SScott Wood		Set this for NAND SPL on PPC mpc83xx targets, so that
300006f60ae3SScott Wood		start.S waits for the rest of the SPL to load before
300106f60ae3SScott Wood		continuing (the hardware starts execution after just
300206f60ae3SScott Wood		loading the first page rather than the full 4K).
300306f60ae3SScott Wood
30046f2f01b9SScott Wood		CONFIG_SPL_NAND_BASE
30056f2f01b9SScott Wood		Include nand_base.c in the SPL.  Requires
30066f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS.
30076f2f01b9SScott Wood
30086f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS
30096f2f01b9SScott Wood		SPL uses normal NAND drivers, not minimal drivers.
30106f2f01b9SScott Wood
30116f2f01b9SScott Wood		CONFIG_SPL_NAND_ECC
30126f2f01b9SScott Wood		Include standard software ECC in the SPL
30136f2f01b9SScott Wood
301495579793STom Rini		CONFIG_SPL_NAND_SIMPLE
30157d4b7955SScott Wood		Support for NAND boot using simple NAND drivers that
30167d4b7955SScott Wood		expose the cmd_ctrl() interface.
301795579793STom Rini
301895579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
301995579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
302095579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
302195579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
302295579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
302395579793STom Rini		Defines the size and behavior of the NAND that SPL uses
30247d4b7955SScott Wood		to read U-Boot
302595579793STom Rini
302695579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
30277d4b7955SScott Wood		Location in NAND to read U-Boot from
30287d4b7955SScott Wood
30297d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_DST
30307d4b7955SScott Wood		Location in memory to load U-Boot to
30317d4b7955SScott Wood
30327d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_SIZE
30337d4b7955SScott Wood		Size of image to load
303495579793STom Rini
303595579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
30367d4b7955SScott Wood		Entry point in loaded image to jump to
303795579793STom Rini
303895579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
303995579793STom Rini		Define this if you need to first read the OOB and then the
304095579793STom Rini		data. This is used for example on davinci plattforms.
304195579793STom Rini
304295579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
304395579793STom Rini		Support for an OMAP3-specific set of functions to return the
304495579793STom Rini		ID and MFR of the first attached NAND chip, if present.
304595579793STom Rini
30466a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
30476a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
30486a11cf48SDaniel Schwierzeck
30496a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
30506a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
30516a11cf48SDaniel Schwierzeck
30526a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
30536a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
30546a11cf48SDaniel Schwierzeck
3055c57b953dSPavel Machek		CONFIG_SPL_RAM_DEVICE
3056c57b953dSPavel Machek		Support for running image already present in ram, in SPL binary
3057c57b953dSPavel Machek
30586a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
30596a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
30601372cce2SMarian Balakowicz
3061ba1bee43SYing Zhang		CONFIG_SPL_ENV_SUPPORT
3062ba1bee43SYing Zhang		Support for the environment operating in SPL binary
3063ba1bee43SYing Zhang
3064ba1bee43SYing Zhang		CONFIG_SPL_NET_SUPPORT
3065ba1bee43SYing Zhang		Support for the net/libnet.o in SPL binary.
3066ba1bee43SYing Zhang		It conflicts with SPL env from storage medium specified by
3067ba1bee43SYing Zhang		CONFIG_ENV_IS_xxx but CONFIG_ENV_IS_NOWHERE
3068ba1bee43SYing Zhang
306974752baaSScott Wood		CONFIG_SPL_PAD_TO
30706113d3f2SBenoît Thébaudeau		Image offset to which the SPL should be padded before appending
30716113d3f2SBenoît Thébaudeau		the SPL payload. By default, this is defined as
30726113d3f2SBenoît Thébaudeau		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
30736113d3f2SBenoît Thébaudeau		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
30746113d3f2SBenoît Thébaudeau		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
307574752baaSScott Wood
3076ca2fca22SScott Wood		CONFIG_SPL_TARGET
3077ca2fca22SScott Wood		Final target image containing SPL and payload.  Some SPLs
3078ca2fca22SScott Wood		use an arch-specific makefile fragment instead, for
3079ca2fca22SScott Wood		example if more than one image needs to be produced.
3080ca2fca22SScott Wood
308187ebee39SSimon Glass		CONFIG_FIT_SPL_PRINT
308287ebee39SSimon Glass		Printing information about a FIT image adds quite a bit of
308387ebee39SSimon Glass		code to SPL. So this is normally disabled in SPL. Use this
308487ebee39SSimon Glass		option to re-enable it. This will affect the output of the
308587ebee39SSimon Glass		bootm command when booting a FIT image.
308687ebee39SSimon Glass
3087c609719bSwdenkModem Support:
3088c609719bSwdenk--------------
3089c609719bSwdenk
3090566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
3091c609719bSwdenk
309211ccc33fSMarcel Ziswiler- Modem support enable:
3093c609719bSwdenk		CONFIG_MODEM_SUPPORT
3094c609719bSwdenk
3095c609719bSwdenk- RTS/CTS Flow control enable:
3096c609719bSwdenk		CONFIG_HWFLOW
3097c609719bSwdenk
3098c609719bSwdenk- Modem debug support:
3099c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
3100c609719bSwdenk
3101c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
3102c609719bSwdenk		for modem support. Useful only with BDI2000.
3103c609719bSwdenk
3104a8c7c708Swdenk- Interrupt support (PPC):
3105a8c7c708Swdenk
3106a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
3107a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
310811ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
3109a8c7c708Swdenk		should set decrementer_count to appropriate value. If
311011ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
3111a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
311211ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
3113a8c7c708Swdenk		specific handling. If board has watchdog / status_led
3114a8c7c708Swdenk		/ other_activity_monitor it works automatically from
3115a8c7c708Swdenk		general timer_interrupt().
3116a8c7c708Swdenk
3117c609719bSwdenk- General:
3118c609719bSwdenk
3119c609719bSwdenk		In the target system modem support is enabled when a
3120c609719bSwdenk		specific key (key combination) is pressed during
3121c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
312211ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
3123c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
3124c609719bSwdenk		function, returning 1 and thus enabling modem
3125c609719bSwdenk		initialization.
3126c609719bSwdenk
3127c609719bSwdenk		If there are no modem init strings in the
3128c609719bSwdenk		environment, U-Boot proceed to autoboot; the
3129c609719bSwdenk		previous output (banner, info printfs) will be
313011ccc33fSMarcel Ziswiler		suppressed, though.
3131c609719bSwdenk
3132c609719bSwdenk		See also: doc/README.Modem
3133c609719bSwdenk
31349660e442SHelmut RaigerBoard initialization settings:
31359660e442SHelmut Raiger------------------------------
31369660e442SHelmut Raiger
31379660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
31389660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
31399660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
31409660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
31419660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
31429660e442SHelmut Raigertypically in board_init_f() and board_init_r().
31439660e442SHelmut Raiger
31449660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
31459660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
31469660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
31479660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
3148c609719bSwdenk
3149c609719bSwdenkConfiguration Settings:
3150c609719bSwdenk-----------------------
3151c609719bSwdenk
31526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
3153c609719bSwdenk		undefine this when you're short of memory.
3154c609719bSwdenk
31552fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
31562fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
31572fb2604dSPeter Tyser
31586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
3159c609719bSwdenk		prompt for user input.
3160c609719bSwdenk
31616d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
3162c609719bSwdenk
31636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
3164c609719bSwdenk
31656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
3166c609719bSwdenk
31676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
3168c609719bSwdenk		the application (usually a Linux kernel) when it is
3169c609719bSwdenk		booted
3170c609719bSwdenk
31716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
3172c609719bSwdenk		List of legal baudrate settings for this board.
3173c609719bSwdenk
31746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
3175c609719bSwdenk		Suppress display of console information at boot.
3176c609719bSwdenk
31776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
3178c609719bSwdenk		If the board specific function
3179c609719bSwdenk			extern int overwrite_console (void);
3180c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
3181c609719bSwdenk		serial port, else the settings in the environment are used.
3182c609719bSwdenk
31836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
3184c609719bSwdenk		Enable the call to overwrite_console().
3185c609719bSwdenk
31866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
3187c609719bSwdenk		Enable overwrite of previous console environment settings.
3188c609719bSwdenk
31896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
3190c609719bSwdenk		Begin and End addresses of the area used by the
3191c609719bSwdenk		simple memory test.
3192c609719bSwdenk
31936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
3194c609719bSwdenk		Enable an alternate, more extensive memory test.
3195c609719bSwdenk
31966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
31975f535fe1Swdenk		Scratch address used by the alternate memory test
31985f535fe1Swdenk		You only need to set this if address zero isn't writeable
31995f535fe1Swdenk
32006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
32016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
320214f73ca6SStefan Roese		this specified memory area will get subtracted from the top
320311ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
320414f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
320514f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
320614f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
32075e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
320814f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
32095e12e75dSStefan Roese		will have to get fixed in Linux additionally.
321014f73ca6SStefan Roese
321114f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
321214f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
321314f73ca6SStefan Roese		be touched.
321414f73ca6SStefan Roese
321514f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
321614f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
321714f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
321814f73ca6SStefan Roese		non page size aligned address and this could cause major
321914f73ca6SStefan Roese		problems.
322014f73ca6SStefan Roese
32216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
3222c609719bSwdenk		Enable temporary baudrate change while serial download
3223c609719bSwdenk
32246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
3225c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
3226c609719bSwdenk
32276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
3228c609719bSwdenk		Physical start address of Motherboard I/O (if using a
3229c609719bSwdenk		Cogent motherboard)
3230c609719bSwdenk
32316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
3232c609719bSwdenk		Physical start address of Flash memory.
3233c609719bSwdenk
32346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
3235c609719bSwdenk		Physical start address of boot monitor code (set by
3236c609719bSwdenk		make config files to be same as the text base address
323714d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
32386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
3239c609719bSwdenk
32406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
32413b57fe0aSwdenk		Size of memory reserved for monitor code, used to
32423b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
32433b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
32443b57fe0aSwdenk		flash sector.
3245c609719bSwdenk
32466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
3247c609719bSwdenk		Size of DRAM reserved for malloc() use.
3248c609719bSwdenk
32496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
325015940c9aSStefan Roese		Normally compressed uImages are limited to an
325115940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
32526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
325315940c9aSStefan Roese		to adjust this setting to your needs.
3254c609719bSwdenk
32556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
3256c609719bSwdenk		Maximum size of memory mapped by the startup code of
3257c609719bSwdenk		the Linux kernel; all data that must be processed by
32587d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
32597d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
32607d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
32617d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
3262c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
3263c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
3264c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
3265c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
3266c609719bSwdenk
3267fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
3268fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
3269fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
3270fca43cc8SJohn Rigby		is enabled.
3271fca43cc8SJohn Rigby
3272fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
3273fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
3274fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
3275fca43cc8SJohn Rigby
3276fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
3277fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
3278fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3279fca43cc8SJohn Rigby
32806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
3281c609719bSwdenk		Max number of Flash memory banks
3282c609719bSwdenk
32836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
3284c609719bSwdenk		Max number of sectors on a Flash chip
3285c609719bSwdenk
32866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
3287c609719bSwdenk		Timeout for Flash erase operations (in ms)
3288c609719bSwdenk
32896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
3290c609719bSwdenk		Timeout for Flash write operations (in ms)
3291c609719bSwdenk
32926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
32938564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
32948564acf9Swdenk
32956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
32968564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
32978564acf9Swdenk
32986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
32998564acf9Swdenk		If defined, hardware flash sectors protection is used
33008564acf9Swdenk		instead of U-Boot software protection.
33018564acf9Swdenk
33026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
3303c609719bSwdenk
3304c609719bSwdenk		Enable TFTP transfers directly to flash memory;
3305c609719bSwdenk		without this option such a download has to be
3306c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
3307c609719bSwdenk		copy from RAM to flash.
3308c609719bSwdenk
3309c609719bSwdenk		The two-step approach is usually more reliable, since
3310c609719bSwdenk		you can check if the download worked before you erase
331111ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
331211ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
3313c609719bSwdenk		downloaded image) this option may be very useful.
3314c609719bSwdenk
33156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
3316c609719bSwdenk		Define if the flash driver uses extra elements in the
33175653fc33Swdenk		common flash structure for storing flash geometry.
33185653fc33Swdenk
331900b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
33205653fc33Swdenk		This option also enables the building of the cfi_flash driver
33215653fc33Swdenk		in the drivers directory
332253cf9435Sstroese
332391809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
332491809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
332591809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
332691809ed5SPiotr Ziecik		to the MTD layer.
332791809ed5SPiotr Ziecik
33286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
332996ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
333096ef831fSGuennadi Liakhovetski
333196ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
333296ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
333396ef831fSGuennadi Liakhovetski		write commands.
333496ef831fSGuennadi Liakhovetski
33356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
33365568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
33375568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
33385568e613SStefan Roese		is useful, if some of the configured banks are only
33395568e613SStefan Roese		optionally available.
33405568e613SStefan Roese
33419a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
33429a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
33439a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
33449a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
33459a042e9cSJerry Van Baren
3346352ef3f1SStefan Roese- CONFIG_FLASH_VERIFY
3347352ef3f1SStefan Roese		If defined, the content of the flash (destination) is compared
3348352ef3f1SStefan Roese		against the source after the write operation. An error message
3349352ef3f1SStefan Roese		will be printed when the contents are not identical.
3350352ef3f1SStefan Roese		Please note that this option is useless in nearly all cases,
3351352ef3f1SStefan Roese		since such flash programming errors usually are detected earlier
3352352ef3f1SStefan Roese		while unprotecting/erasing/programming. Please only enable
3353352ef3f1SStefan Roese		this option if you really know what you are doing.
3354352ef3f1SStefan Roese
33556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
335611ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
335711ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
335853cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
335953cf9435Sstroese		buffers can be full shortly after enabling the interface
336011ccc33fSMarcel Ziswiler		on high Ethernet traffic.
336153cf9435Sstroese		Defaults to 4 if not defined.
3362c609719bSwdenk
3363ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
3364ea882bafSWolfgang Denk
3365ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
3366ea882bafSWolfgang Denk	internally to store the environment settings. The default
3367ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
3368ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
3369ea882bafSWolfgang Denk	lib/hashtable.c for details.
3370ea882bafSWolfgang Denk
33712598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_DEFAULT
33722598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_STATIC
33732598090bSJoe Hershberger	Enable validation of the values given to enviroment variables when
33742598090bSJoe Hershberger	calling env set.  Variables can be restricted to only decimal,
33752598090bSJoe Hershberger	hexadecimal, or boolean.  If CONFIG_CMD_NET is also defined,
33762598090bSJoe Hershberger	the variables can also be restricted to IP address or MAC address.
33772598090bSJoe Hershberger
33782598090bSJoe Hershberger	The format of the list is:
33792598090bSJoe Hershberger		type_attribute = [s|d|x|b|i|m]
3380267541f7SJoe Hershberger		access_atribute = [a|r|o|c]
3381267541f7SJoe Hershberger		attributes = type_attribute[access_atribute]
33822598090bSJoe Hershberger		entry = variable_name[:attributes]
33832598090bSJoe Hershberger		list = entry[,list]
33842598090bSJoe Hershberger
33852598090bSJoe Hershberger	The type attributes are:
33862598090bSJoe Hershberger		s - String (default)
33872598090bSJoe Hershberger		d - Decimal
33882598090bSJoe Hershberger		x - Hexadecimal
33892598090bSJoe Hershberger		b - Boolean ([1yYtT|0nNfF])
33902598090bSJoe Hershberger		i - IP address
33912598090bSJoe Hershberger		m - MAC address
33922598090bSJoe Hershberger
3393267541f7SJoe Hershberger	The access attributes are:
3394267541f7SJoe Hershberger		a - Any (default)
3395267541f7SJoe Hershberger		r - Read-only
3396267541f7SJoe Hershberger		o - Write-once
3397267541f7SJoe Hershberger		c - Change-default
3398267541f7SJoe Hershberger
33992598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_DEFAULT
34002598090bSJoe Hershberger		Define this to a list (string) to define the ".flags"
34012598090bSJoe Hershberger		envirnoment variable in the default or embedded environment.
34022598090bSJoe Hershberger
34032598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_STATIC
34042598090bSJoe Hershberger		Define this to a list (string) to define validation that
34052598090bSJoe Hershberger		should be done if an entry is not found in the ".flags"
34062598090bSJoe Hershberger		environment variable.  To override a setting in the static
34072598090bSJoe Hershberger		list, simply add an entry for the same variable name to the
34082598090bSJoe Hershberger		".flags" variable.
34092598090bSJoe Hershberger
3410267541f7SJoe Hershberger- CONFIG_ENV_ACCESS_IGNORE_FORCE
3411267541f7SJoe Hershberger	If defined, don't allow the -f switch to env set override variable
3412267541f7SJoe Hershberger	access flags.
3413267541f7SJoe Hershberger
34145c1a7ea6SSimon Glass- CONFIG_SYS_GENERIC_BOARD
34155c1a7ea6SSimon Glass	This selects the architecture-generic board system instead of the
34165c1a7ea6SSimon Glass	architecture-specific board files. It is intended to move boards
34175c1a7ea6SSimon Glass	to this new framework over time. Defining this will disable the
34185c1a7ea6SSimon Glass	arch/foo/lib/board.c file and use common/board_f.c and
34195c1a7ea6SSimon Glass	common/board_r.c instead. To use this option your architecture
34205c1a7ea6SSimon Glass	must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
34215c1a7ea6SSimon Glass	its config.mk file). If you find problems enabling this option on
34225c1a7ea6SSimon Glass	your board please report the problem and send patches!
34235c1a7ea6SSimon Glass
3424632efa74SSimon Glass- CONFIG_SYS_SYM_OFFSETS
3425632efa74SSimon Glass	This is set by architectures that use offsets for link symbols
3426632efa74SSimon Glass	instead of absolute values. So bss_start is obtained using an
3427632efa74SSimon Glass	offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
3428632efa74SSimon Glass	directly. You should not need to touch this setting.
3429632efa74SSimon Glass
34300b1b60c7SLokesh Vutla- CONFIG_OMAP_PLATFORM_RESET_TIME_MAX_USEC (OMAP only)
34310b1b60c7SLokesh Vutla	This is set by OMAP boards for the max time that reset should
34320b1b60c7SLokesh Vutla	be asserted. See doc/README.omap-reset-time for details on how
34330b1b60c7SLokesh Vutla	the value can be calulated on a given board.
3434632efa74SSimon Glass
3435c609719bSwdenkThe following definitions that deal with the placement and management
3436c609719bSwdenkof environment data (variable area); in general, we support the
3437c609719bSwdenkfollowing configurations:
3438c609719bSwdenk
3439c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
3440c3eb3fe4SMike Frysinger
3441c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
3442c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
3443c3eb3fe4SMike Frysinger
34445a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
3445c609719bSwdenk
3446c609719bSwdenk	Define this if the environment is in flash memory.
3447c609719bSwdenk
3448c609719bSwdenk	a) The environment occupies one whole flash sector, which is
3449c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
3450c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
3451c609719bSwdenk	   sector" type flash chips, which have several smaller
3452c609719bSwdenk	   sectors at the start or the end. For instance, such a
3453c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3454c609719bSwdenk	   such a case you would place the environment in one of the
3455c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
3456c609719bSwdenk	   "top boot sector" type flash chips, you would put the
3457c609719bSwdenk	   environment in one of the last sectors, leaving a gap
3458c609719bSwdenk	   between U-Boot and the environment.
3459c609719bSwdenk
34600e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
3461c609719bSwdenk
3462c609719bSwdenk	   Offset of environment data (variable area) to the
3463c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
3464c609719bSwdenk	   type flash chips the second sector can be used: the offset
3465c609719bSwdenk	   for this sector is given here.
3466c609719bSwdenk
34676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
3468c609719bSwdenk
34690e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
3470c609719bSwdenk
3471c609719bSwdenk	   This is just another way to specify the start address of
3472c609719bSwdenk	   the flash sector containing the environment (instead of
34730e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
3474c609719bSwdenk
34750e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
3476c609719bSwdenk
3477c609719bSwdenk	   Size of the sector containing the environment.
3478c609719bSwdenk
3479c609719bSwdenk
3480c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
3481c609719bSwdenk	   In such a case you don't want to spend a whole sector for
3482c609719bSwdenk	   the environment.
3483c609719bSwdenk
34840e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3485c609719bSwdenk
34865a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
34870e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3488c609719bSwdenk	   of this flash sector for the environment. This saves
3489c609719bSwdenk	   memory for the RAM copy of the environment.
3490c609719bSwdenk
3491c609719bSwdenk	   It may also save flash memory if you decide to use this
3492c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
3493c609719bSwdenk	   since then the remainder of the flash sector could be used
3494c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
3495c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
3496c609719bSwdenk	   updating the environment in flash makes it always
3497c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
3498c609719bSwdenk	   wrong before the contents has been restored from a copy in
3499c609719bSwdenk	   RAM, your target system will be dead.
3500c609719bSwdenk
35010e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
35020e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
3503c609719bSwdenk
3504c609719bSwdenk	   These settings describe a second storage area used to hold
350511ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
35063e38691eSwdenk	   a valid backup copy in case there is a power failure during
3507c609719bSwdenk	   a "saveenv" operation.
3508c609719bSwdenk
3509c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
3510c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
3511c609719bSwdenkaccordingly!
3512c609719bSwdenk
3513c609719bSwdenk
35149314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
3515c609719bSwdenk
3516c609719bSwdenk	Define this if you have some non-volatile memory device
3517c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
3518c609719bSwdenk	environment.
3519c609719bSwdenk
35200e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
35210e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3522c609719bSwdenk
352311ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
3524c609719bSwdenk	  want to use for environment. It is assumed that this memory
3525c609719bSwdenk	  can just be read and written to, without any special
3526c609719bSwdenk	  provision.
3527c609719bSwdenk
3528c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
3529c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
353011ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
3531c609719bSwdenkU-Boot will hang.
3532c609719bSwdenk
3533c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
3534c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
3535c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
3536c609719bSwdenkto save the current settings.
3537c609719bSwdenk
3538c609719bSwdenk
3539bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
3540c609719bSwdenk
3541c609719bSwdenk	Use this if you have an EEPROM or similar serial access
3542c609719bSwdenk	device and a driver for it.
3543c609719bSwdenk
35440e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
35450e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3546c609719bSwdenk
3547c609719bSwdenk	  These two #defines specify the offset and size of the
3548c609719bSwdenk	  environment area within the total memory of your EEPROM.
3549c609719bSwdenk
35506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
3551c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
3552c609719bSwdenk	  The default address is zero.
3553c609719bSwdenk
35546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3555c609719bSwdenk	  If defined, the number of bits used to address bytes in a
3556c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
3557c609719bSwdenk	  would require six bits.
3558c609719bSwdenk
35596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3560c609719bSwdenk	  If defined, the number of milliseconds to delay between
3561c609719bSwdenk	  page writes.	The default is zero milliseconds.
3562c609719bSwdenk
35636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3564c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
3565c609719bSwdenk	  that this is NOT the chip address length!
3566c609719bSwdenk
35676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
35685cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
35695cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
35705cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
35715cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
35725cf91d6bSwdenk	  byte chips.
35735cf91d6bSwdenk
35745cf91d6bSwdenk	  Note that we consider the length of the address field to
35755cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
35765cf91d6bSwdenk	  in the chip address.
35775cf91d6bSwdenk
35786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
3579c609719bSwdenk	  The size in bytes of the EEPROM device.
3580c609719bSwdenk
3581548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
3582548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
3583548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
3584548738b4SHeiko Schocher
3585548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
3586548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
3587548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
3588548738b4SHeiko Schocher	  EEPROM. For example:
3589548738b4SHeiko Schocher
3590548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
3591548738b4SHeiko Schocher
3592548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3593548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3594c609719bSwdenk
3595057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
35965779d8d9Swdenk
35975779d8d9Swdenk	Define this if you have a DataFlash memory device which you
35985779d8d9Swdenk	want to use for the environment.
35995779d8d9Swdenk
36000e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
36010e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
36020e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
36035779d8d9Swdenk
36045779d8d9Swdenk	  These three #defines specify the offset and size of the
36055779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
36065779d8d9Swdenk	  at the specified address.
36075779d8d9Swdenk
36080a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
36090a85a9e7SLiu Gang
36100a85a9e7SLiu Gang	Define this if you have a remote memory space which you
36110a85a9e7SLiu Gang	want to use for the local device's environment.
36120a85a9e7SLiu Gang
36130a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
36140a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
36150a85a9e7SLiu Gang
36160a85a9e7SLiu Gang	  These two #defines specify the address and size of the
36170a85a9e7SLiu Gang	  environment area within the remote memory space. The
36180a85a9e7SLiu Gang	  local device can get the environment from remote memory
3619fc54c7faSLiu Gang	  space by SRIO or PCIE links.
36200a85a9e7SLiu Gang
36210a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
36220a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
3623fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
3624fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
36250a85a9e7SLiu Gang
362651bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
362713a5695bSwdenk
362813a5695bSwdenk	Define this if you have a NAND device which you want to use
362913a5695bSwdenk	for the environment.
363013a5695bSwdenk
36310e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
36320e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
363313a5695bSwdenk
363413a5695bSwdenk	  These two #defines specify the offset and size of the environment
3635fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3636fdd813deSScott Wood	  aligned to an erase block boundary.
36375779d8d9Swdenk
3638fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3639e443c944SMarkus Klotzbuecher
36400e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3641fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3642fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3643fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3644fdd813deSScott Wood	  aligned to an erase block boundary.
3645e443c944SMarkus Klotzbuecher
3646fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3647fdd813deSScott Wood
3648fdd813deSScott Wood	  Specifies the length of the region in which the environment
3649fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3650fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3651fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3652fdd813deSScott Wood	  the range to be avoided.
3653fdd813deSScott Wood
3654fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3655fdd813deSScott Wood
3656fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3657fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3658fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3659fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3660fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3661e443c944SMarkus Klotzbuecher
3662b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3663b74ab737SGuennadi Liakhovetski
3664b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3665b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3666b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3667b74ab737SGuennadi Liakhovetski
36682b74433fSJoe Hershberger- CONFIG_ENV_IS_IN_UBI:
36692b74433fSJoe Hershberger
36702b74433fSJoe Hershberger	Define this if you have an UBI volume that you want to use for the
36712b74433fSJoe Hershberger	environment.  This has the benefit of wear-leveling the environment
36722b74433fSJoe Hershberger	accesses, which is important on NAND.
36732b74433fSJoe Hershberger
36742b74433fSJoe Hershberger	- CONFIG_ENV_UBI_PART:
36752b74433fSJoe Hershberger
36762b74433fSJoe Hershberger	  Define this to a string that is the mtd partition containing the UBI.
36772b74433fSJoe Hershberger
36782b74433fSJoe Hershberger	- CONFIG_ENV_UBI_VOLUME:
36792b74433fSJoe Hershberger
36802b74433fSJoe Hershberger	  Define this to the name of the volume that you want to store the
36812b74433fSJoe Hershberger	  environment in.
36822b74433fSJoe Hershberger
3683785881f7SJoe Hershberger	- CONFIG_ENV_UBI_VOLUME_REDUND:
3684785881f7SJoe Hershberger
3685785881f7SJoe Hershberger	  Define this to the name of another volume to store a second copy of
3686785881f7SJoe Hershberger	  the environment in.  This will enable redundant environments in UBI.
3687785881f7SJoe Hershberger	  It is assumed that both volumes are in the same MTD partition.
3688785881f7SJoe Hershberger
36892b74433fSJoe Hershberger	- CONFIG_UBI_SILENCE_MSG
36902b74433fSJoe Hershberger	- CONFIG_UBIFS_SILENCE_MSG
36912b74433fSJoe Hershberger
36922b74433fSJoe Hershberger	  You will probably want to define these to avoid a really noisy system
36932b74433fSJoe Hershberger	  when storing the env in UBI.
36942b74433fSJoe Hershberger
369506e4ae5fSStephen Warren- CONFIG_ENV_IS_IN_MMC:
369606e4ae5fSStephen Warren
369706e4ae5fSStephen Warren	Define this if you have an MMC device which you want to use for the
369806e4ae5fSStephen Warren	environment.
369906e4ae5fSStephen Warren
370006e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_DEV:
370106e4ae5fSStephen Warren
370206e4ae5fSStephen Warren	  Specifies which MMC device the environment is stored in.
370306e4ae5fSStephen Warren
370406e4ae5fSStephen Warren	- CONFIG_SYS_MMC_ENV_PART (optional):
370506e4ae5fSStephen Warren
370606e4ae5fSStephen Warren	  Specifies which MMC partition the environment is stored in. If not
370706e4ae5fSStephen Warren	  set, defaults to partition 0, the user area. Common values might be
370806e4ae5fSStephen Warren	  1 (first MMC boot partition), 2 (second MMC boot partition).
370906e4ae5fSStephen Warren
371006e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET:
371106e4ae5fSStephen Warren	- CONFIG_ENV_SIZE:
371206e4ae5fSStephen Warren
371306e4ae5fSStephen Warren	  These two #defines specify the offset and size of the environment
371406e4ae5fSStephen Warren	  area within the specified MMC device.
371506e4ae5fSStephen Warren
37165c088ee8SStephen Warren	  If offset is positive (the usual case), it is treated as relative to
37175c088ee8SStephen Warren	  the start of the MMC partition. If offset is negative, it is treated
37185c088ee8SStephen Warren	  as relative to the end of the MMC partition. This can be useful if
37195c088ee8SStephen Warren	  your board may be fitted with different MMC devices, which have
37205c088ee8SStephen Warren	  different sizes for the MMC partitions, and you always want the
37215c088ee8SStephen Warren	  environment placed at the very end of the partition, to leave the
37225c088ee8SStephen Warren	  maximum possible space before it, to store other data.
37235c088ee8SStephen Warren
372406e4ae5fSStephen Warren	  These two values are in units of bytes, but must be aligned to an
372506e4ae5fSStephen Warren	  MMC sector boundary.
372606e4ae5fSStephen Warren
372706e4ae5fSStephen Warren	- CONFIG_ENV_OFFSET_REDUND (optional):
372806e4ae5fSStephen Warren
372906e4ae5fSStephen Warren	  Specifies a second storage area, of CONFIG_ENV_SIZE size, used to
373006e4ae5fSStephen Warren	  hold a redundant copy of the environment data. This provides a
373106e4ae5fSStephen Warren	  valid backup copy in case the other copy is corrupted, e.g. due
373206e4ae5fSStephen Warren	  to a power failure during a "saveenv" operation.
373306e4ae5fSStephen Warren
37345c088ee8SStephen Warren	  This value may also be positive or negative; this is handled in the
37355c088ee8SStephen Warren	  same way as CONFIG_ENV_OFFSET.
37365c088ee8SStephen Warren
373706e4ae5fSStephen Warren	  This value is also in units of bytes, but must also be aligned to
373806e4ae5fSStephen Warren	  an MMC sector boundary.
373906e4ae5fSStephen Warren
374006e4ae5fSStephen Warren	- CONFIG_ENV_SIZE_REDUND (optional):
374106e4ae5fSStephen Warren
374206e4ae5fSStephen Warren	  This value need not be set, even when CONFIG_ENV_OFFSET_REDUND is
374306e4ae5fSStephen Warren	  set. If this value is set, it must be set to the same value as
374406e4ae5fSStephen Warren	  CONFIG_ENV_SIZE.
374506e4ae5fSStephen Warren
37466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
3747c609719bSwdenk
3748c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
3749c609719bSwdenk	area is used at an early stage (ROM part) if the environment
3750c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
3751c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
3752c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3753c609719bSwdenk	to be a good choice since it makes it far enough from the
3754c609719bSwdenk	start of the data area as well as from the stack pointer.
3755c609719bSwdenk
3756e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
3757c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
3758cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
3759c609719bSwdenkuntil then to read environment variables.
3760c609719bSwdenk
376185ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
376285ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
376385ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
376485ec0bccSwdenknecessary, because the first environment variable we need is the
376585ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
376685ec0bccSwdenkhave any device yet where we could complain.]
3767c609719bSwdenk
3768c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
3769c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
377085ec0bccSwdenkuse the "saveenv" command to store a valid environment.
3771c609719bSwdenk
37726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3773fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
3774fc3e2165Swdenk
37756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3776fc3e2165Swdenk		      also needs to be defined.
3777fc3e2165Swdenk
37786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
3779fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
3780c609719bSwdenk
3781f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
3782f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
3783f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
3784f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
3785f5675aa5SRon Madrid		space for already greatly restricted images, including but not
3786f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3787f5675aa5SRon Madrid
3788b2b92f53SSimon Glass- CONFIG_DISPLAY_BOARDINFO
3789b2b92f53SSimon Glass		Display information about the board that U-Boot is running on
3790b2b92f53SSimon Glass		when U-Boot starts up. The board function checkboard() is called
3791b2b92f53SSimon Glass		to do this.
3792b2b92f53SSimon Glass
3793e2e3e2b1SSimon Glass- CONFIG_DISPLAY_BOARDINFO_LATE
3794e2e3e2b1SSimon Glass		Similar to the previous option, but display this information
3795e2e3e2b1SSimon Glass		later, once stdio is running and output goes to the LCD, if
3796e2e3e2b1SSimon Glass		present.
3797e2e3e2b1SSimon Glass
3798c609719bSwdenkLow Level (hardware related) configuration options:
3799dc7c9a1aSwdenk---------------------------------------------------
3800c609719bSwdenk
38016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3802c609719bSwdenk		Cache Line Size of the CPU.
3803c609719bSwdenk
38046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3805c609719bSwdenk		Default address of the IMMR after system reset.
38062535d602Swdenk
38072535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
38082535d602Swdenk		and RPXsuper) to be able to adjust the position of
38092535d602Swdenk		the IMMR register after a reset.
3810c609719bSwdenk
3811e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3812e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3813e46fedfeSTimur Tabi		PowerPC SOCs.
3814e46fedfeSTimur Tabi
3815e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3816e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3817e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3818e46fedfeSTimur Tabi
3819e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3820e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3821e46fedfeSTimur Tabi
3822e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3823e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3824e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3825e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3826e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3827e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3828e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3829e46fedfeSTimur Tabi
3830e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3831e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3832e46fedfeSTimur Tabi
3833e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3834e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3835e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
3836e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3837e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3838e46fedfeSTimur Tabi
3839e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3840e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
3841e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3842e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3843e46fedfeSTimur Tabi
3844e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3845e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3846e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
3847e46fedfeSTimur Tabi
38487f6c2cbcSwdenk- Floppy Disk Support:
38496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
38507f6c2cbcSwdenk
38517f6c2cbcSwdenk		the default drive number (default value 0)
38527f6c2cbcSwdenk
38536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
38547f6c2cbcSwdenk
385511ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
38567f6c2cbcSwdenk		(default value 1)
38577f6c2cbcSwdenk
38586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
38597f6c2cbcSwdenk
38607f6c2cbcSwdenk		defines the offset of register from address. It
38617f6c2cbcSwdenk		depends on which part of the data bus is connected to
386211ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
38637f6c2cbcSwdenk
38646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
38656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
38667f6c2cbcSwdenk		default value.
38677f6c2cbcSwdenk
38686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
38697f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
38707f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
38717f6c2cbcSwdenk		source code. It is used to make hardware dependant
38727f6c2cbcSwdenk		initializations.
38737f6c2cbcSwdenk
38740abddf82SMacpaul Lin- CONFIG_IDE_AHB:
38750abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
38760abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
38770abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
38780abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
38790abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
38800abddf82SMacpaul Lin		is requierd.
38810abddf82SMacpaul Lin
38826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
388325d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
388425d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
3885c609719bSwdenk
38866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
3887c609719bSwdenk
38887152b1d0Swdenk		Start address of memory area that can be used for
3889c609719bSwdenk		initial data and stack; please note that this must be
3890c609719bSwdenk		writable memory that is working WITHOUT special
3891c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
3892c609719bSwdenk		will become available only after programming the
3893c609719bSwdenk		memory controller and running certain initialization
3894c609719bSwdenk		sequences.
3895c609719bSwdenk
3896c609719bSwdenk		U-Boot uses the following memory types:
3897c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3898c609719bSwdenk		- MPC824X: data cache
3899c609719bSwdenk		- PPC4xx:  data cache
3900c609719bSwdenk
39016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
3902c609719bSwdenk
3903c609719bSwdenk		Offset of the initial data structure in the memory
39046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
39056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
3906c609719bSwdenk		data is located at the end of the available space
3907553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
39086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
39096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
39106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
3911c609719bSwdenk
3912c609719bSwdenk	Note:
3913c609719bSwdenk		On the MPC824X (or other systems that use the data
3914c609719bSwdenk		cache for initial memory) the address chosen for
39156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
3916c609719bSwdenk		point to an otherwise UNUSED address space between
3917c609719bSwdenk		the top of RAM and the start of the PCI space.
3918c609719bSwdenk
39196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
3920c609719bSwdenk
39216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
3922c609719bSwdenk
39236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
3924c609719bSwdenk
39256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
3926c609719bSwdenk
39276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
3928c609719bSwdenk
39296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
3930c609719bSwdenk
39316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
3932c609719bSwdenk		SDRAM timing
3933c609719bSwdenk
39346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
3935c609719bSwdenk		periodic timer for refresh
3936c609719bSwdenk
39376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
3938c609719bSwdenk
39396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
39406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
39416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
39426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
3943c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3944c609719bSwdenk
3945c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
39466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
39476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
3948c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3949c609719bSwdenk
39506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
39516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
3952c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
3953c609719bSwdenk		Prescaler definitions (SDRAM timing)
3954c609719bSwdenk
39556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
3956c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
3957c609719bSwdenk		define relocation offset in DPRAM [DSP2]
3958c609719bSwdenk
39596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
3960b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
3961b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
3962b423d055SHeiko Schocher
39636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
3964c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
3965c609719bSwdenk		define relocation offset in DPRAM [SCC4]
3966c609719bSwdenk
39676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
3968c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
3969c609719bSwdenk		wrong setting might damage your board. Read
3970c609719bSwdenk		doc/README.MBX before setting this variable!
3971c609719bSwdenk
39726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
3973ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
3974ea909b76Swdenk		(Power On Self Tests). This definition overrides
3975ea909b76Swdenk		#define'd default value in commproc.h resp.
3976ea909b76Swdenk		cpm_8260.h.
3977ea909b76Swdenk
39786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
39796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
39806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
39816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
39826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
39836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
39846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
39856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
3986a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
39875d232d0eSwdenk
39889cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
39899cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
39909cacf4fcSDirk Eibach		required.
39919cacf4fcSDirk Eibach
399269fd2d3bSAndrew Sharp- CONFIG_PCI_ENUM_ONLY
399369fd2d3bSAndrew Sharp		Only scan through and get the devices on the busses.
399469fd2d3bSAndrew Sharp		Don't do any setup work, presumably because someone or
399569fd2d3bSAndrew Sharp		something has already done it, and we don't need to do it
399669fd2d3bSAndrew Sharp		a second time.	Useful for platforms that are pre-booted
399769fd2d3bSAndrew Sharp		by coreboot or similar.
399869fd2d3bSAndrew Sharp
3999842033e6SGabor Juhos- CONFIG_PCI_INDIRECT_BRIDGE:
4000842033e6SGabor Juhos		Enable support for indirect PCI bridges.
4001842033e6SGabor Juhos
4002a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
4003a09b9b68SKumar Gala		Chip has SRIO or not
4004a09b9b68SKumar Gala
4005a09b9b68SKumar Gala- CONFIG_SRIO1:
4006a09b9b68SKumar Gala		Board has SRIO 1 port available
4007a09b9b68SKumar Gala
4008a09b9b68SKumar Gala- CONFIG_SRIO2:
4009a09b9b68SKumar Gala		Board has SRIO 2 port available
4010a09b9b68SKumar Gala
4011c8b28152SLiu Gang- CONFIG_SRIO_PCIE_BOOT_MASTER
4012c8b28152SLiu Gang		Board can support master function for Boot from SRIO and PCIE
4013c8b28152SLiu Gang
4014a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
4015a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
4016a09b9b68SKumar Gala
4017a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
4018a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
4019a09b9b68SKumar Gala
4020a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
4021a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
4022a09b9b68SKumar Gala
402366bd1846SFabio Estevam- CONFIG_SYS_NAND_BUSWIDTH_16BIT
402466bd1846SFabio Estevam		Defined to tell the NAND controller that the NAND chip is using
402566bd1846SFabio Estevam		a 16 bit bus.
402666bd1846SFabio Estevam		Not all NAND drivers use this symbol.
4027a430e916SFabio Estevam		Example of drivers that use it:
402866bd1846SFabio Estevam		- drivers/mtd/nand/ndfc.c
4029a430e916SFabio Estevam		- drivers/mtd/nand/mxc_nand.c
4030eced4626SAlex Waterman
4031eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
4032eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
4033eced4626SAlex Waterman		a default value will be used.
4034eced4626SAlex Waterman
4035bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
4036218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
4037218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
4038218ca724SWolfgang Denk
4039bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
4040bb99ad6dSBen Warren		I2C address of the SPD EEPROM
4041bb99ad6dSBen Warren
40426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
4043218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
4044218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
4045218ca724SWolfgang Denk		to something your driver can deal with.
4046bb99ad6dSBen Warren
40471b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
40481b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
40491b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
40501b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
40511b3e3c4fSYork Sun		header files or board specific files.
40521b3e3c4fSYork Sun
40536f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
40546f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
40556f5e1dc5SYork Sun
40566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
4057218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
4058218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
40592ad6b513STimur Tabi
4060c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
4061c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
4062c26e454dSwdenk
4063c26e454dSwdenk- CONFIG_FEC[12]_PHY
4064c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
40656e592385Swdenk		to the given FEC; i. e.
4066c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
4067c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
4068c26e454dSwdenk
4069c26e454dSwdenk		When set to -1, means to probe for first available.
4070c26e454dSwdenk
4071c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
4072c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
4073c26e454dSwdenk		(so program the FEC to ignore it).
4074c26e454dSwdenk
4075c26e454dSwdenk- CONFIG_RMII
4076c26e454dSwdenk		Enable RMII mode for all FECs.
4077c26e454dSwdenk		Note that this is a global option, we can't
4078c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
4079c26e454dSwdenk
40805cf91d6bSwdenk- CONFIG_CRC32_VERIFY
40815cf91d6bSwdenk		Add a verify option to the crc32 command.
40825cf91d6bSwdenk		The syntax is:
40835cf91d6bSwdenk
40845cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
40855cf91d6bSwdenk
40865cf91d6bSwdenk		Where address/count indicate a memory area
40875cf91d6bSwdenk		and crc32 is the correct crc32 which the
40885cf91d6bSwdenk		area should have.
40895cf91d6bSwdenk
409056523f12Swdenk- CONFIG_LOOPW
409156523f12Swdenk		Add the "loopw" memory command. This only takes effect if
4092602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
409356523f12Swdenk
40947b466641Sstroese- CONFIG_MX_CYCLIC
40957b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
40967b466641Sstroese		"md/mw" commands.
40977b466641Sstroese		Examples:
40987b466641Sstroese
40997b466641Sstroese		=> mdc.b 10 4 500
41007b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
41017b466641Sstroese
41027b466641Sstroese		=> mwc.l 100 12345678 10
41037b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
41047b466641Sstroese
41057b466641Sstroese		This only takes effect if the memory commands are activated
4106602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
41077b466641Sstroese
41088aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
4109afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
4110e03f3169SWolfgang Denk		low level initializations (like setting up the memory
4111e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
4112e03f3169SWolfgang Denk		relocate itself into RAM.
41138aa1a2d1Swdenk
4114e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
4115e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
4116e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
4117e03f3169SWolfgang Denk		these initializations itself.
41188aa1a2d1Swdenk
4119401bb30bSAneesh V- CONFIG_SPL_BUILD
4120df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
4121df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
4122df81238bSMagnus Lilja		compiling a NAND SPL.
4123400558b5Swdenk
41245df572f0SYing Zhang- CONFIG_SYS_MPC85XX_NO_RESETVEC
41255df572f0SYing Zhang		Only for 85xx systems. If this variable is specified, the section
41265df572f0SYing Zhang		.resetvec is not kept and the section .bootpg is placed in the
41275df572f0SYing Zhang		previous 4k of the .text section.
41285df572f0SYing Zhang
41294213fc29SSimon Glass- CONFIG_ARCH_MAP_SYSMEM
41304213fc29SSimon Glass		Generally U-Boot (and in particular the md command) uses
41314213fc29SSimon Glass		effective address. It is therefore not necessary to regard
41324213fc29SSimon Glass		U-Boot address as virtual addresses that need to be translated
41334213fc29SSimon Glass		to physical addresses. However, sandbox requires this, since
41344213fc29SSimon Glass		it maintains its own little RAM buffer which contains all
41354213fc29SSimon Glass		addressable memory. This option causes some memory accesses
41364213fc29SSimon Glass		to be mapped through map_sysmem() / unmap_sysmem().
41374213fc29SSimon Glass
4138d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
4139d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
4140d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
4141d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
4142d8834a13SMatthias Weisser		conditions but may increase the binary size.
4143d8834a13SMatthias Weisser
4144588a13f7SSimon Glass- CONFIG_X86_RESET_VECTOR
4145588a13f7SSimon Glass		If defined, the x86 reset vector code is included. This is not
4146588a13f7SSimon Glass		needed when U-Boot is running from Coreboot.
4147b16f521aSGabe Black
4148fc33705eSMark Jackson- CONFIG_SYS_MPUCLK
4149fc33705eSMark Jackson		Defines the MPU clock speed (in MHz).
4150fc33705eSMark Jackson
4151fc33705eSMark Jackson		NOTE : currently only supported on AM335x platforms.
41525b5ece9eSGabe Black
4153f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
4154f2717b47STimur Tabi-----------------------------------
4155f2717b47STimur Tabi
4156f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
4157f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
4158f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
4159f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
4160f2717b47STimur Tabiwithin that device.
4161f2717b47STimur Tabi
4162f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
4163f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
4164f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
4165f2717b47STimur Tabi	is also specified.
4166f2717b47STimur Tabi
4167f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
4168f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
4169f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
4170f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
4171f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
4172f2717b47STimur Tabi
4173f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
4174f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
4175f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
4176f2717b47STimur Tabi	virtual address in NOR flash.
4177f2717b47STimur Tabi
4178f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
4179f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
4180f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
4181f2717b47STimur Tabi
4182f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
4183f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
4184f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4185f2717b47STimur Tabi
4186f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
4187f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
4188f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4189f2717b47STimur Tabi
4190292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
4191292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
4192292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
4193fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
4194fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
4195fc54c7faSLiu Gang	master's memory space.
4196f2717b47STimur Tabi
4197c609719bSwdenkBuilding the Software:
4198c609719bSwdenk======================
4199c609719bSwdenk
4200218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
4201218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
4202218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
4203218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
4204218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
4205218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
4206c609719bSwdenk
4207218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
4208218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
4209218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
4210218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
4211218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
4212c609719bSwdenk
4213218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
4214218ca724SWolfgang Denk	$ export CROSS_COMPILE
4215c609719bSwdenk
42162f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
42172f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
42182f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
42192f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
42202f8d396bSPeter Tyser
42212f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
42222f8d396bSPeter Tyser
42232f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
42242f8d396bSPeter Tyser      be executed on computers running Windows.
42252f8d396bSPeter Tyser
4226c609719bSwdenkU-Boot is intended to be simple to build. After installing the
4227c609719bSwdenksources you must configure U-Boot for one specific board type. This
4228c609719bSwdenkis done by typing:
4229c609719bSwdenk
4230c609719bSwdenk	make NAME_config
4231c609719bSwdenk
4232218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
42334d675ae6SMichael Jonesrations; see boards.cfg for supported names.
423454387ac9Swdenk
4235c609719bSwdenkNote: for some board special configuration names may exist; check if
4236c609719bSwdenk      additional information is available from the board vendor; for
42372729af9dSwdenk      instance, the TQM823L systems are available without (standard)
42382729af9dSwdenk      or with LCD support. You can select such additional "features"
423911ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
4240c609719bSwdenk
42412729af9dSwdenk      make TQM823L_config
42422729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
4243c609719bSwdenk
4244c609719bSwdenk      make TQM823L_LCD_config
4245c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
4246c609719bSwdenk
4247c609719bSwdenk      etc.
4248c609719bSwdenk
4249c609719bSwdenk
4250c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
42517152b1d0Swdenkimages ready for download to / installation on your system:
4252c609719bSwdenk
4253c609719bSwdenk- "u-boot.bin" is a raw binary image
4254c609719bSwdenk- "u-boot" is an image in ELF binary format
4255c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
4256c609719bSwdenk
4257baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
4258baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
4259baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
4260baf31249SMarian Balakowicz
4261baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
4262baf31249SMarian Balakowicz
4263baf31249SMarian Balakowicz	make O=/tmp/build distclean
4264baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
4265baf31249SMarian Balakowicz	make O=/tmp/build all
4266baf31249SMarian Balakowicz
4267baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
4268baf31249SMarian Balakowicz
4269baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4270baf31249SMarian Balakowicz	make distclean
4271baf31249SMarian Balakowicz	make NAME_config
4272baf31249SMarian Balakowicz	make all
4273baf31249SMarian Balakowicz
4274baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
4275baf31249SMarian Balakowiczvariable.
4276baf31249SMarian Balakowicz
4277c609719bSwdenk
4278c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
4279c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
4280c609719bSwdenknative "make".
4281c609719bSwdenk
4282c609719bSwdenk
4283c609719bSwdenkIf the system board that you have is not listed, then you will need
4284c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
4285c609719bSwdenksteps:
4286c609719bSwdenk
4287c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
42884d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
42894d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
4290c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
429185ec0bccSwdenk    files you need. In your board directory, you will need at least
429285ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
429385ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
429485ec0bccSwdenk    your board
4295c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
4296c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
429785ec0bccSwdenk4.  Run "make <board>_config" with your new name.
4298c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
4299c609719bSwdenk    to be installed on your target system.
430085ec0bccSwdenk6.  Debug and solve any problems that might arise.
4301c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
4302c609719bSwdenk
4303c609719bSwdenk
4304c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
4305c609719bSwdenk==============================================================
4306c609719bSwdenk
4307c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
4308c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
4309c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
4310c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
4311218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
4312c609719bSwdenk
4313c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
4314c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
4315c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
4316c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
4317c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
43187152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
4319218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
4320218ca724SWolfgang Denkyou can type
4321c609719bSwdenk
4322c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
4323c609719bSwdenk
4324c609719bSwdenkor to build on a native PowerPC system you can type
4325c609719bSwdenk
4326c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
4327c609719bSwdenk
4328218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
4329218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
4330218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
4331218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
4332218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
4333218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
4334218ca724SWolfgang Denkvariable. For example:
4335baf31249SMarian Balakowicz
4336baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4337baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
4338baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
4339baf31249SMarian Balakowicz
4340218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
4341218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
4342218ca724SWolfgang Denkduring the whole build process.
4343baf31249SMarian Balakowicz
4344baf31249SMarian Balakowicz
4345c609719bSwdenkSee also "U-Boot Porting Guide" below.
4346c609719bSwdenk
4347c609719bSwdenk
4348c609719bSwdenkMonitor Commands - Overview:
4349c609719bSwdenk============================
4350c609719bSwdenk
4351c609719bSwdenkgo	- start application at address 'addr'
4352c609719bSwdenkrun	- run commands in an environment variable
4353c609719bSwdenkbootm	- boot application image from memory
4354c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
435544f074c7SMarek Vasutbootz   - boot zImage from memory
4356c609719bSwdenktftpboot- boot image via network using TFTP protocol
4357c609719bSwdenk	       and env variables "ipaddr" and "serverip"
4358c609719bSwdenk	       (and eventually "gatewayip")
43591fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
4360c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
4361c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
4362c609719bSwdenkloads	- load S-Record file over serial line
4363c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
4364c609719bSwdenkmd	- memory display
4365c609719bSwdenkmm	- memory modify (auto-incrementing)
4366c609719bSwdenknm	- memory modify (constant address)
4367c609719bSwdenkmw	- memory write (fill)
4368c609719bSwdenkcp	- memory copy
4369c609719bSwdenkcmp	- memory compare
4370c609719bSwdenkcrc32	- checksum calculation
43710f89c54bSPeter Tyseri2c	- I2C sub-system
4372c609719bSwdenksspi	- SPI utility commands
4373c609719bSwdenkbase	- print or set address offset
4374c609719bSwdenkprintenv- print environment variables
4375c609719bSwdenksetenv	- set environment variables
4376c609719bSwdenksaveenv - save environment variables to persistent storage
4377c609719bSwdenkprotect - enable or disable FLASH write protection
4378c609719bSwdenkerase	- erase FLASH memory
4379c609719bSwdenkflinfo	- print FLASH memory information
438010635afaSKarl O. Pincnand	- NAND memory operations (see doc/README.nand)
4381c609719bSwdenkbdinfo	- print Board Info structure
4382c609719bSwdenkiminfo	- print header information for application image
4383c609719bSwdenkconinfo - print console devices and informations
4384c609719bSwdenkide	- IDE sub-system
4385c609719bSwdenkloop	- infinite loop on address range
438656523f12Swdenkloopw	- infinite write loop on address range
4387c609719bSwdenkmtest	- simple RAM test
4388c609719bSwdenkicache	- enable or disable instruction cache
4389c609719bSwdenkdcache	- enable or disable data cache
4390c609719bSwdenkreset	- Perform RESET of the CPU
4391c609719bSwdenkecho	- echo args to console
4392c609719bSwdenkversion - print monitor version
4393c609719bSwdenkhelp	- print online help
4394c609719bSwdenk?	- alias for 'help'
4395c609719bSwdenk
4396c609719bSwdenk
4397c609719bSwdenkMonitor Commands - Detailed Description:
4398c609719bSwdenk========================================
4399c609719bSwdenk
4400c609719bSwdenkTODO.
4401c609719bSwdenk
4402c609719bSwdenkFor now: just type "help <command>".
4403c609719bSwdenk
4404c609719bSwdenk
4405c609719bSwdenkEnvironment Variables:
4406c609719bSwdenk======================
4407c609719bSwdenk
4408c609719bSwdenkU-Boot supports user configuration using Environment Variables which
4409c609719bSwdenkcan be made persistent by saving to Flash memory.
4410c609719bSwdenk
4411c609719bSwdenkEnvironment Variables are set using "setenv", printed using
4412c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
4413c609719bSwdenkwithout a value can be used to delete a variable from the
4414c609719bSwdenkenvironment. As long as you don't save the environment you are
4415c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
4416c609719bSwdenkenvironment is erased by accident, a default environment is provided.
4417c609719bSwdenk
4418c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
4419c96f86eeSWolfgang Denk
4420c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
4421c609719bSwdenk
4422c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
4423c609719bSwdenk
4424c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
4425c609719bSwdenk
4426c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
4427c609719bSwdenk
4428c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
4429c609719bSwdenk
4430c609719bSwdenk  bootfile	- Name of the image to load with TFTP
4431c609719bSwdenk
44327d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
44337d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
44347d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
44357d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
44367d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
44377d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
4438c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
4439c3624e6eSGrant Likely		  bootm_mapsize.
4440c3624e6eSGrant Likely
4441c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
4442c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
4443c3624e6eSGrant Likely		  defines the size of the memory region starting at base
4444c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
4445c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
4446c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
4447c3624e6eSGrant Likely		  used otherwise.
44487d721e34SBartlomiej Sieka
44497d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
44507d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
44517d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
44527d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
44537d721e34SBartlomiej Sieka		  environment variable.
44547d721e34SBartlomiej Sieka
44554bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
44564bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
44574bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
44584bae9090SBartlomiej Sieka
4459c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
4460c609719bSwdenk		  "bootp" will just load perform a lookup of the
4461c609719bSwdenk		  configuration from the BOOTP server, but not try to
4462c609719bSwdenk		  load any image using TFTP
4463c609719bSwdenk
4464c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
4465c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
4466c609719bSwdenk		  be automatically started (by internally calling
4467c609719bSwdenk		  "bootm")
4468c609719bSwdenk
44694a6fd34bSwdenk		  If set to "no", a standalone image passed to the
44704a6fd34bSwdenk		  "bootm" command will be copied to the load address
44714a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
44724a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
44734a6fd34bSwdenk		  data.
44744a6fd34bSwdenk
4475a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
4476a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
4477fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
4478fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
4479fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
4480fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
4481fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
4482fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
4483fa34f6b2SShawn Guo		  access it during the boot procedure.
4484fa34f6b2SShawn Guo
4485a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
4486a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
4487a28afca5SDavid A. Long		  to work it must reside in writable memory, have
4488a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
4489a28afca5SDavid A. Long		  add the information it needs into it, and the memory
4490a28afca5SDavid A. Long		  must be accessible by the kernel.
4491a28afca5SDavid A. Long
4492eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
4493eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
4494eea63e05SSimon Glass		  defined.
4495eea63e05SSimon Glass
449617ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
449717ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
449817ea1177Swdenk		  mode (400kHZ). This environment variable is used in
449917ea1177Swdenk		  initialization code. So, for changes to be effective
450017ea1177Swdenk		  it must be saved and board must be reset.
450117ea1177Swdenk
4502c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
4503c609719bSwdenk		  If this variable is not set, initrd images will be
4504c609719bSwdenk		  copied to the highest possible address in RAM; this
4505c609719bSwdenk		  is usually what you want since it allows for
4506c609719bSwdenk		  maximum initrd size. If for some reason you want to
4507c609719bSwdenk		  make sure that the initrd image is loaded below the
45086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
4509c609719bSwdenk		  variable to a value of "no" or "off" or "0".
4510c609719bSwdenk		  Alternatively, you can set it to a maximum upper
4511c609719bSwdenk		  address to use (U-Boot will still check that it
4512c609719bSwdenk		  does not overwrite the U-Boot stack and data).
4513c609719bSwdenk
4514c609719bSwdenk		  For instance, when you have a system with 16 MB
45157152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
4516c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
4517c609719bSwdenk		  the "bootargs" variable. However, now you must make
45187152b1d0Swdenk		  sure that the initrd image is placed in the first
4519c609719bSwdenk		  12 MB as well - this can be done with
4520c609719bSwdenk
4521c609719bSwdenk		  setenv initrd_high 00c00000
4522c609719bSwdenk
452338b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
452438b99261Swdenk		  indication to U-Boot that all addresses are legal
452538b99261Swdenk		  for the Linux kernel, including addresses in flash
452638b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
452738b99261Swdenk		  ramdisk at all. This may be useful to reduce the
452838b99261Swdenk		  boot time on your system, but requires that this
452938b99261Swdenk		  feature is supported by your Linux kernel.
453038b99261Swdenk
4531c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
4532c609719bSwdenk
4533c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
4534dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
4535c609719bSwdenk
4536c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
4537c609719bSwdenk
4538c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
4539c609719bSwdenk
4540c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
4541c609719bSwdenk
4542c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
4543c609719bSwdenk
4544c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
4545c609719bSwdenk
4546e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
4547a3d991bdSwdenk
4548e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
4549e2a53458SMike Frysinger		  For example you can do the following
4550a3d991bdSwdenk
455148690d80SHeiko Schocher		  => setenv ethact FEC
455248690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
455348690d80SHeiko Schocher		  => setenv ethact SCC
455448690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
4555a3d991bdSwdenk
4556e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
4557e1692577SMatthias Fuchs		  available network interfaces.
4558e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
4559e1692577SMatthias Fuchs
4560a3d991bdSwdenk  netretry	- When set to "no" each network operation will
4561a3d991bdSwdenk		  either succeed or fail without retrying.
45626e592385Swdenk		  When set to "once" the network operation will
45636e592385Swdenk		  fail when all the available network interfaces
45646e592385Swdenk		  are tried once without success.
4565a3d991bdSwdenk		  Useful on scripts which control the retry operation
4566a3d991bdSwdenk		  themselves.
4567a3d991bdSwdenk
4568b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
4569a1cf027aSJean-Christophe PLAGNIOL-VILLARD
457028cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
4571ecb0ccd9SWolfgang Denk		  UDP source port.
4572ecb0ccd9SWolfgang Denk
457328cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
457428cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
457528cb9375SWolfgang Denk
4576c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
4577c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
4578c96f86eeSWolfgang Denk
4579c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
4580c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
4581c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
4582c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
4583c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
4584c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
4585c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
4586c96f86eeSWolfgang Denk
4587a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
458811ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
4589a3d991bdSwdenk		  VLAN tagged frames.
4590c609719bSwdenk
4591dc0b7b0eSJason HobbsThe following image location variables contain the location of images
4592dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
4593dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
4594dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
4595dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
4596dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
4597dc0b7b0eSJason Hobbsflash or offset in NAND flash.
4598dc0b7b0eSJason Hobbs
4599dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
4600dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
4601dc0b7b0eSJason Hobbsboards use these variables for other purposes.
4602dc0b7b0eSJason Hobbs
4603dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
4604dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
4605dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
4606dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
4607dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
4608dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
4609dc0b7b0eSJason Hobbs
4610c609719bSwdenkThe following environment variables may be used and automatically
4611c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
4612c609719bSwdenkdepending the information provided by your boot server:
4613c609719bSwdenk
4614c609719bSwdenk  bootfile	- see above
4615c609719bSwdenk  dnsip		- IP address of your Domain Name Server
4616fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
4617c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
4618c609719bSwdenk  hostname	- Target hostname
4619c609719bSwdenk  ipaddr	- see above
4620c609719bSwdenk  netmask	- Subnet Mask
4621c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
4622c609719bSwdenk  serverip	- see above
4623c609719bSwdenk
4624c609719bSwdenk
4625c609719bSwdenkThere are two special Environment Variables:
4626c609719bSwdenk
4627c609719bSwdenk  serial#	- contains hardware identification information such
4628c609719bSwdenk		  as type string and/or serial number
4629c609719bSwdenk  ethaddr	- Ethernet address
4630c609719bSwdenk
4631c609719bSwdenkThese variables can be set only once (usually during manufacturing of
4632c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
4633c609719bSwdenkonce they have been set once.
4634c609719bSwdenk
4635c609719bSwdenk
4636c1551ea8SstroeseFurther special Environment Variables:
4637c1551ea8Sstroese
4638c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
4639c1551ea8Sstroese		  with the "version" command. This variable is
4640c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
4641c1551ea8Sstroese
4642c1551ea8Sstroese
4643c609719bSwdenkPlease note that changes to some configuration parameters may take
4644c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
4645c609719bSwdenk
4646c609719bSwdenk
4647170ab110SJoe HershbergerCallback functions for environment variables:
4648170ab110SJoe Hershberger---------------------------------------------
4649170ab110SJoe Hershberger
4650170ab110SJoe HershbergerFor some environment variables, the behavior of u-boot needs to change
4651170ab110SJoe Hershbergerwhen their values are changed.  This functionailty allows functions to
4652170ab110SJoe Hershbergerbe associated with arbitrary variables.  On creation, overwrite, or
4653170ab110SJoe Hershbergerdeletion, the callback will provide the opportunity for some side
4654170ab110SJoe Hershbergereffect to happen or for the change to be rejected.
4655170ab110SJoe Hershberger
4656170ab110SJoe HershbergerThe callbacks are named and associated with a function using the
4657170ab110SJoe HershbergerU_BOOT_ENV_CALLBACK macro in your board or driver code.
4658170ab110SJoe Hershberger
4659170ab110SJoe HershbergerThese callbacks are associated with variables in one of two ways.  The
4660170ab110SJoe Hershbergerstatic list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
4661170ab110SJoe Hershbergerin the board configuration to a string that defines a list of
4662170ab110SJoe Hershbergerassociations.  The list must be in the following format:
4663170ab110SJoe Hershberger
4664170ab110SJoe Hershberger	entry = variable_name[:callback_name]
4665170ab110SJoe Hershberger	list = entry[,list]
4666170ab110SJoe Hershberger
4667170ab110SJoe HershbergerIf the callback name is not specified, then the callback is deleted.
4668170ab110SJoe HershbergerSpaces are also allowed anywhere in the list.
4669170ab110SJoe Hershberger
4670170ab110SJoe HershbergerCallbacks can also be associated by defining the ".callbacks" variable
4671170ab110SJoe Hershbergerwith the same list format above.  Any association in ".callbacks" will
4672170ab110SJoe Hershbergeroverride any association in the static list. You can define
4673170ab110SJoe HershbergerCONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
4674170ab110SJoe Hershberger".callbacks" envirnoment variable in the default or embedded environment.
4675170ab110SJoe Hershberger
4676170ab110SJoe Hershberger
4677f07771ccSwdenkCommand Line Parsing:
4678f07771ccSwdenk=====================
4679f07771ccSwdenk
4680f07771ccSwdenkThere are two different command line parsers available with U-Boot:
46817152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
4682f07771ccSwdenk
4683f07771ccSwdenkOld, simple command line parser:
4684f07771ccSwdenk--------------------------------
4685f07771ccSwdenk
4686f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
4687f07771ccSwdenk- several commands on one line, separated by ';'
4688fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
4689f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
4690f07771ccSwdenk  for example:
4691fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
4692f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
4693f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
4694f07771ccSwdenk
4695f07771ccSwdenkHush shell:
4696f07771ccSwdenk-----------
4697f07771ccSwdenk
4698f07771ccSwdenk- similar to Bourne shell, with control structures like
4699f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
4700f07771ccSwdenk  until...do...done, ...
4701f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
4702f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
4703f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
4704f07771ccSwdenk  command
4705f07771ccSwdenk
4706f07771ccSwdenkGeneral rules:
4707f07771ccSwdenk--------------
4708f07771ccSwdenk
4709f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
4710f07771ccSwdenk    command) contains several commands separated by semicolon, and
4711f07771ccSwdenk    one of these commands fails, then the remaining commands will be
4712f07771ccSwdenk    executed anyway.
4713f07771ccSwdenk
4714f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
471511ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
4716f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
4717f07771ccSwdenk    variables are not executed.
4718f07771ccSwdenk
4719c609719bSwdenkNote for Redundant Ethernet Interfaces:
4720c609719bSwdenk=======================================
4721c609719bSwdenk
472211ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
4723c609719bSwdenksuch configurations and is capable of automatic selection of a
47247152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
4725c609719bSwdenk
4726c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
4727c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4728c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
4729c609719bSwdenk
4730c609719bSwdenkIf the network interface stores some valid MAC address (for instance
4731c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
4732c609719bSwdenkding setting in the environment; if the corresponding environment
4733c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
4734c609719bSwdenk
4735c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
4736c609719bSwdenk  environment, the SROM's address is used.
4737c609719bSwdenk
4738c609719bSwdenko If there is no valid address in the SROM, and a definition in the
4739c609719bSwdenk  environment exists, then the value from the environment variable is
4740c609719bSwdenk  used.
4741c609719bSwdenk
4742c609719bSwdenko If both the SROM and the environment contain a MAC address, and
4743c609719bSwdenk  both addresses are the same, this MAC address is used.
4744c609719bSwdenk
4745c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
4746c609719bSwdenk  addresses differ, the value from the environment is used and a
4747c609719bSwdenk  warning is printed.
4748c609719bSwdenk
4749c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
4750c609719bSwdenk  is raised.
4751c609719bSwdenk
4752ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
4753ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
4754ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
4755ecee9324SBen WarrenThe naming convention is as follows:
4756ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
4757c609719bSwdenk
4758c609719bSwdenkImage Formats:
4759c609719bSwdenk==============
4760c609719bSwdenk
47613310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
47623310c549SMarian Balakowiczimages in two formats:
47633310c549SMarian Balakowicz
47643310c549SMarian BalakowiczNew uImage format (FIT)
47653310c549SMarian Balakowicz-----------------------
47663310c549SMarian Balakowicz
47673310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
47683310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
47693310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
47703310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
47713310c549SMarian Balakowicz
47723310c549SMarian Balakowicz
47733310c549SMarian BalakowiczOld uImage format
47743310c549SMarian Balakowicz-----------------
47753310c549SMarian Balakowicz
47763310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
47773310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
47783310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
4779c609719bSwdenk
4780c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4781c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4782f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4783f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4784f5ed9e39SPeter Tyser  INTEGRITY).
47857b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4786afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4787afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4788c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
4789c609719bSwdenk* Load Address
4790c609719bSwdenk* Entry Point
4791c609719bSwdenk* Image Name
4792c609719bSwdenk* Image Timestamp
4793c609719bSwdenk
4794c609719bSwdenkThe header is marked by a special Magic Number, and both the header
4795c609719bSwdenkand the data portions of the image are secured against corruption by
4796c609719bSwdenkCRC32 checksums.
4797c609719bSwdenk
4798c609719bSwdenk
4799c609719bSwdenkLinux Support:
4800c609719bSwdenk==============
4801c609719bSwdenk
4802c609719bSwdenkAlthough U-Boot should support any OS or standalone application
48037152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
4804c609719bSwdenkU-Boot.
4805c609719bSwdenk
4806c609719bSwdenkU-Boot includes many features that so far have been part of some
4807c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
4808c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
4809c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
48107152b1d0Swdenkserves several purposes:
4811c609719bSwdenk
4812c609719bSwdenk- the same features can be used for other OS or standalone
4813c609719bSwdenk  applications (for instance: using compressed images to reduce the
4814c609719bSwdenk  Flash memory footprint)
4815c609719bSwdenk
4816c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
48177152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
4818c609719bSwdenk
4819c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
4820c609719bSwdenk  images; of course this also means that different kernel images can
4821c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
4822c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
4823c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
4824c609719bSwdenk  software is easier now.
4825c609719bSwdenk
4826c609719bSwdenk
4827c609719bSwdenkLinux HOWTO:
4828c609719bSwdenk============
4829c609719bSwdenk
4830c609719bSwdenkPorting Linux to U-Boot based systems:
4831c609719bSwdenk---------------------------------------
4832c609719bSwdenk
4833c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
4834c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
4835c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
4836c609719bSwdenkLinux :-).
4837c609719bSwdenk
4838a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
4839c609719bSwdenk
4840c609719bSwdenkJust make sure your machine specific header file (for instance
4841c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
48421dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
48431dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
48446d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
4845c609719bSwdenk
4846c609719bSwdenk
4847c609719bSwdenkConfiguring the Linux kernel:
4848c609719bSwdenk-----------------------------
4849c609719bSwdenk
4850c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
4851c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
4852c609719bSwdenk
4853c609719bSwdenk
4854c609719bSwdenkBuilding a Linux Image:
4855c609719bSwdenk-----------------------
4856c609719bSwdenk
485724ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
485824ee89b9Swdenknot used. If you use recent kernel source, a new build target
485924ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
486024ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
486124ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
486224ee89b9Swdenk100% compatible format.
4863c609719bSwdenk
4864c609719bSwdenkExample:
4865c609719bSwdenk
4866c609719bSwdenk	make TQM850L_config
4867c609719bSwdenk	make oldconfig
4868c609719bSwdenk	make dep
486924ee89b9Swdenk	make uImage
4870c609719bSwdenk
487124ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
487224ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
487324ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
4874c609719bSwdenk
487524ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
487624ee89b9Swdenk
487724ee89b9Swdenk* convert the kernel into a raw binary image:
487824ee89b9Swdenk
487924ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
488024ee89b9Swdenk				 -R .note -R .comment \
488124ee89b9Swdenk				 -S vmlinux linux.bin
488224ee89b9Swdenk
488324ee89b9Swdenk* compress the binary image:
488424ee89b9Swdenk
488524ee89b9Swdenk	gzip -9 linux.bin
488624ee89b9Swdenk
488724ee89b9Swdenk* package compressed binary image for U-Boot:
488824ee89b9Swdenk
488924ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
489024ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
489124ee89b9Swdenk		-d linux.bin.gz uImage
489224ee89b9Swdenk
489324ee89b9Swdenk
489424ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
489524ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
489624ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
489724ee89b9Swdenkbyte header containing information about target architecture,
489824ee89b9Swdenkoperating system, image type, compression method, entry points, time
489924ee89b9Swdenkstamp, CRC32 checksums, etc.
490024ee89b9Swdenk
490124ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
490224ee89b9Swdenkprint the header information, or to build new images.
4903c609719bSwdenk
4904c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
4905c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
4906c609719bSwdenkchecksum verification:
4907c609719bSwdenk
4908c609719bSwdenk	tools/mkimage -l image
4909c609719bSwdenk	  -l ==> list image header information
4910c609719bSwdenk
4911c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
4912c609719bSwdenkfrom a "data file" which is used as image payload:
4913c609719bSwdenk
4914c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
4915c609719bSwdenk		      -n name -d data_file image
4916c609719bSwdenk	  -A ==> set architecture to 'arch'
4917c609719bSwdenk	  -O ==> set operating system to 'os'
4918c609719bSwdenk	  -T ==> set image type to 'type'
4919c609719bSwdenk	  -C ==> set compression type 'comp'
4920c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
4921c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
4922c609719bSwdenk	  -n ==> set image name to 'name'
4923c609719bSwdenk	  -d ==> use image data from 'datafile'
4924c609719bSwdenk
492569459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
492669459791Swdenkaddress (0x00000000), but the entry point address depends on the
492769459791Swdenkkernel version:
4928c609719bSwdenk
4929c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
493024ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
4931c609719bSwdenk
4932c609719bSwdenkSo a typical call to build a U-Boot image would read:
4933c609719bSwdenk
493424ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
493524ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
4936a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
493724ee89b9Swdenk	> examples/uImage.TQM850L
493824ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4939c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4940c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4941c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4942c609719bSwdenk	Load Address: 0x00000000
494324ee89b9Swdenk	Entry Point:  0x00000000
4944c609719bSwdenk
4945c609719bSwdenkTo verify the contents of the image (or check for corruption):
4946c609719bSwdenk
494724ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
494824ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4949c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4950c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4951c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4952c609719bSwdenk	Load Address: 0x00000000
495324ee89b9Swdenk	Entry Point:  0x00000000
4954c609719bSwdenk
4955c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
4956c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
4957c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
4958c609719bSwdenkneed to be uncompressed:
4959c609719bSwdenk
4960a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
496124ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
496224ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
4963a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
496424ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
496524ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4966c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4967c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
4968c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
4969c609719bSwdenk	Load Address: 0x00000000
497024ee89b9Swdenk	Entry Point:  0x00000000
4971c609719bSwdenk
4972c609719bSwdenk
4973c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
4974c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
4975c609719bSwdenk
4976c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
4977c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
4978c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
4979c609719bSwdenk	Image Name:   Simple Ramdisk Image
4980c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
4981c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
4982c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
4983c609719bSwdenk	Load Address: 0x00000000
4984c609719bSwdenk	Entry Point:  0x00000000
4985c609719bSwdenk
4986c609719bSwdenk
4987c609719bSwdenkInstalling a Linux Image:
4988c609719bSwdenk-------------------------
4989c609719bSwdenk
4990c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
4991c609719bSwdenkyou must convert the image to S-Record format:
4992c609719bSwdenk
4993c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
4994c609719bSwdenk
4995c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
4996c609719bSwdenkimage header, so the resulting S-Record file will be relative to
4997c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
4998c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
4999c609719bSwdenkcommand.
5000c609719bSwdenk
5001c609719bSwdenkExample: install the image to address 0x40100000 (which on the
5002c609719bSwdenkTQM8xxL is in the first Flash bank):
5003c609719bSwdenk
5004c609719bSwdenk	=> erase 40100000 401FFFFF
5005c609719bSwdenk
5006c609719bSwdenk	.......... done
5007c609719bSwdenk	Erased 8 sectors
5008c609719bSwdenk
5009c609719bSwdenk	=> loads 40100000
5010c609719bSwdenk	## Ready for S-Record download ...
5011c609719bSwdenk	~>examples/image.srec
5012c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
5013c609719bSwdenk	...
5014c609719bSwdenk	15989 15990 15991 15992
5015c609719bSwdenk	[file transfer complete]
5016c609719bSwdenk	[connected]
5017c609719bSwdenk	## Start Addr = 0x00000000
5018c609719bSwdenk
5019c609719bSwdenk
5020c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
5021c609719bSwdenkthis includes a checksum verification so you can be sure no data
5022c609719bSwdenkcorruption happened:
5023c609719bSwdenk
5024c609719bSwdenk	=> imi 40100000
5025c609719bSwdenk
5026c609719bSwdenk	## Checking Image at 40100000 ...
5027c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5028c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5029c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5030c609719bSwdenk	   Load Address: 00000000
5031c609719bSwdenk	   Entry Point:	 0000000c
5032c609719bSwdenk	   Verifying Checksum ... OK
5033c609719bSwdenk
5034c609719bSwdenk
5035c609719bSwdenkBoot Linux:
5036c609719bSwdenk-----------
5037c609719bSwdenk
5038c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
5039c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
5040c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
5041c609719bSwdenkparameters. You can check and modify this variable using the
5042c609719bSwdenk"printenv" and "setenv" commands:
5043c609719bSwdenk
5044c609719bSwdenk
5045c609719bSwdenk	=> printenv bootargs
5046c609719bSwdenk	bootargs=root=/dev/ram
5047c609719bSwdenk
5048c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5049c609719bSwdenk
5050c609719bSwdenk	=> printenv bootargs
5051c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5052c609719bSwdenk
5053c609719bSwdenk	=> bootm 40020000
5054c609719bSwdenk	## Booting Linux kernel at 40020000 ...
5055c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
5056c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5057c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
5058c609719bSwdenk	   Load Address: 00000000
5059c609719bSwdenk	   Entry Point:	 0000000c
5060c609719bSwdenk	   Verifying Checksum ... OK
5061c609719bSwdenk	   Uncompressing Kernel Image ... OK
5062c609719bSwdenk	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
5063c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
5064c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5065c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5066c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
5067c609719bSwdenk	...
5068c609719bSwdenk
506911ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
50707152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
5071c609719bSwdenkformat!) to the "bootm" command:
5072c609719bSwdenk
5073c609719bSwdenk	=> imi 40100000 40200000
5074c609719bSwdenk
5075c609719bSwdenk	## Checking Image at 40100000 ...
5076c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5077c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5078c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5079c609719bSwdenk	   Load Address: 00000000
5080c609719bSwdenk	   Entry Point:	 0000000c
5081c609719bSwdenk	   Verifying Checksum ... OK
5082c609719bSwdenk
5083c609719bSwdenk	## Checking Image at 40200000 ...
5084c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5085c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5086c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5087c609719bSwdenk	   Load Address: 00000000
5088c609719bSwdenk	   Entry Point:	 00000000
5089c609719bSwdenk	   Verifying Checksum ... OK
5090c609719bSwdenk
5091c609719bSwdenk	=> bootm 40100000 40200000
5092c609719bSwdenk	## Booting Linux kernel at 40100000 ...
5093c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
5094c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
5095c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
5096c609719bSwdenk	   Load Address: 00000000
5097c609719bSwdenk	   Entry Point:	 0000000c
5098c609719bSwdenk	   Verifying Checksum ... OK
5099c609719bSwdenk	   Uncompressing Kernel Image ... OK
5100c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
5101c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
5102c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
5103c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
5104c609719bSwdenk	   Load Address: 00000000
5105c609719bSwdenk	   Entry Point:	 00000000
5106c609719bSwdenk	   Verifying Checksum ... OK
5107c609719bSwdenk	   Loading Ramdisk ... OK
5108c609719bSwdenk	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
5109c609719bSwdenk	Boot arguments: root=/dev/ram
5110c609719bSwdenk	time_init: decrementer frequency = 187500000/60
5111c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
5112c609719bSwdenk	...
5113c609719bSwdenk	RAMDISK: Compressed image found at block 0
5114c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
5115c609719bSwdenk
5116c609719bSwdenk	bash#
5117c609719bSwdenk
51180267768eSMatthew McClintockBoot Linux and pass a flat device tree:
51190267768eSMatthew McClintock-----------
51200267768eSMatthew McClintock
51210267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
51220267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
51230267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
51240267768eSMatthew McClintockflat device tree:
51250267768eSMatthew McClintock
51260267768eSMatthew McClintock=> print oftaddr
51270267768eSMatthew McClintockoftaddr=0x300000
51280267768eSMatthew McClintock=> print oft
51290267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
51300267768eSMatthew McClintock=> tftp $oftaddr $oft
51310267768eSMatthew McClintockSpeed: 1000, full duplex
51320267768eSMatthew McClintockUsing TSEC0 device
51330267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
51340267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
51350267768eSMatthew McClintockLoad address: 0x300000
51360267768eSMatthew McClintockLoading: #
51370267768eSMatthew McClintockdone
51380267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
51390267768eSMatthew McClintock=> tftp $loadaddr $bootfile
51400267768eSMatthew McClintockSpeed: 1000, full duplex
51410267768eSMatthew McClintockUsing TSEC0 device
51420267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
51430267768eSMatthew McClintockFilename 'uImage'.
51440267768eSMatthew McClintockLoad address: 0x200000
51450267768eSMatthew McClintockLoading:############
51460267768eSMatthew McClintockdone
51470267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
51480267768eSMatthew McClintock=> print loadaddr
51490267768eSMatthew McClintockloadaddr=200000
51500267768eSMatthew McClintock=> print oftaddr
51510267768eSMatthew McClintockoftaddr=0x300000
51520267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
51530267768eSMatthew McClintock## Booting image at 00200000 ...
51540267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
51550267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
51560267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
51570267768eSMatthew McClintock   Load Address: 00000000
51580267768eSMatthew McClintock   Entry Point:	 00000000
51590267768eSMatthew McClintock   Verifying Checksum ... OK
51600267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
51610267768eSMatthew McClintockBooting using flat device tree at 0x300000
51620267768eSMatthew McClintockUsing MPC85xx ADS machine description
51630267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
51640267768eSMatthew McClintock[snip]
51650267768eSMatthew McClintock
51660267768eSMatthew McClintock
51676069ff26SwdenkMore About U-Boot Image Types:
51686069ff26Swdenk------------------------------
51696069ff26Swdenk
51706069ff26SwdenkU-Boot supports the following image types:
51716069ff26Swdenk
51726069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
51736069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
51746069ff26Swdenk	well) you can continue to work in U-Boot after return from
51756069ff26Swdenk	the Standalone Program.
51766069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
51776069ff26Swdenk	will take over control completely. Usually these programs
51786069ff26Swdenk	will install their own set of exception handlers, device
51796069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
51806069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
51816069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
51826069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
51836069ff26Swdenk	being started.
51846069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
51856069ff26Swdenk	(Linux) kernel image and one or more data images like
51866069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
51876069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
51886069ff26Swdenk	server provides just a single image file, but you want to get
51896069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
51906069ff26Swdenk
51916069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
51926069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
51936069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
51946069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
51956069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
51966069ff26Swdenk	a multiple of 4 bytes).
51976069ff26Swdenk
51986069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
51996069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
52006069ff26Swdenk	flash memory.
52016069ff26Swdenk
52026069ff26Swdenk   "Script files" are command sequences that will be executed by
52036069ff26Swdenk	U-Boot's command interpreter; this feature is especially
52046069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
52056069ff26Swdenk	as command interpreter.
52066069ff26Swdenk
520744f074c7SMarek VasutBooting the Linux zImage:
520844f074c7SMarek Vasut-------------------------
520944f074c7SMarek Vasut
521044f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
521144f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
521244f074c7SMarek Vasutas the syntax of "bootm" command.
521344f074c7SMarek Vasut
52148ac28563STom RiniNote, defining the CONFIG_SUPPORT_RAW_INITRD allows user to supply
5215017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
5216017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
5217017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
5218017e1f3fSMarek Vasut
5219c609719bSwdenk
5220c609719bSwdenkStandalone HOWTO:
5221c609719bSwdenk=================
5222c609719bSwdenk
5223c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
5224c609719bSwdenkrun "standalone" applications, which can use some resources of
5225c609719bSwdenkU-Boot like console I/O functions or interrupt services.
5226c609719bSwdenk
5227c609719bSwdenkTwo simple examples are included with the sources:
5228c609719bSwdenk
5229c609719bSwdenk"Hello World" Demo:
5230c609719bSwdenk-------------------
5231c609719bSwdenk
5232c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
5233c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
5234c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
5235c609719bSwdenklike that:
5236c609719bSwdenk
5237c609719bSwdenk	=> loads
5238c609719bSwdenk	## Ready for S-Record download ...
5239c609719bSwdenk	~>examples/hello_world.srec
5240c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5241c609719bSwdenk	[file transfer complete]
5242c609719bSwdenk	[connected]
5243c609719bSwdenk	## Start Addr = 0x00040004
5244c609719bSwdenk
5245c609719bSwdenk	=> go 40004 Hello World! This is a test.
5246c609719bSwdenk	## Starting application at 0x00040004 ...
5247c609719bSwdenk	Hello World
5248c609719bSwdenk	argc = 7
5249c609719bSwdenk	argv[0] = "40004"
5250c609719bSwdenk	argv[1] = "Hello"
5251c609719bSwdenk	argv[2] = "World!"
5252c609719bSwdenk	argv[3] = "This"
5253c609719bSwdenk	argv[4] = "is"
5254c609719bSwdenk	argv[5] = "a"
5255c609719bSwdenk	argv[6] = "test."
5256c609719bSwdenk	argv[7] = "<NULL>"
5257c609719bSwdenk	Hit any key to exit ...
5258c609719bSwdenk
5259c609719bSwdenk	## Application terminated, rc = 0x0
5260c609719bSwdenk
5261c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
5262c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
5263c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
5264c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
5265c609719bSwdenkcharacter, but this is just a demo program. The application can be
5266c609719bSwdenkcontrolled by the following keys:
5267c609719bSwdenk
5268c609719bSwdenk	? - print current values og the CPM Timer registers
5269c609719bSwdenk	b - enable interrupts and start timer
5270c609719bSwdenk	e - stop timer and disable interrupts
5271c609719bSwdenk	q - quit application
5272c609719bSwdenk
5273c609719bSwdenk	=> loads
5274c609719bSwdenk	## Ready for S-Record download ...
5275c609719bSwdenk	~>examples/timer.srec
5276c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5277c609719bSwdenk	[file transfer complete]
5278c609719bSwdenk	[connected]
5279c609719bSwdenk	## Start Addr = 0x00040004
5280c609719bSwdenk
5281c609719bSwdenk	=> go 40004
5282c609719bSwdenk	## Starting application at 0x00040004 ...
5283c609719bSwdenk	TIMERS=0xfff00980
5284c609719bSwdenk	Using timer 1
5285c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
5286c609719bSwdenk
5287c609719bSwdenkHit 'b':
5288c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
5289c609719bSwdenk	Enabling timer
5290c609719bSwdenkHit '?':
5291c609719bSwdenk	[q, b, e, ?] ........
5292c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
5293c609719bSwdenkHit '?':
5294c609719bSwdenk	[q, b, e, ?] .
5295c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
5296c609719bSwdenkHit '?':
5297c609719bSwdenk	[q, b, e, ?] .
5298c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
5299c609719bSwdenkHit '?':
5300c609719bSwdenk	[q, b, e, ?] .
5301c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
5302c609719bSwdenkHit 'e':
5303c609719bSwdenk	[q, b, e, ?] ...Stopping timer
5304c609719bSwdenkHit 'q':
5305c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
5306c609719bSwdenk
5307c609719bSwdenk
530885ec0bccSwdenkMinicom warning:
530985ec0bccSwdenk================
531085ec0bccSwdenk
53117152b1d0SwdenkOver time, many people have reported problems when trying to use the
531285ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
531385ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
5314f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
531585ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
5316e53515a2SKarl O. Pincuse "cu" for S-Record download ("loads" command).  See
5317e53515a2SKarl O. Pinchttp://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
5318e53515a2SKarl O. Pincfor help with kermit.
5319e53515a2SKarl O. Pinc
532085ec0bccSwdenk
532152f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
532252f52c14Swdenkconfiguration to your "File transfer protocols" section:
532352f52c14Swdenk
532452f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
532552f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
532652f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
532752f52c14Swdenk
532852f52c14Swdenk
5329c609719bSwdenkNetBSD Notes:
5330c609719bSwdenk=============
5331c609719bSwdenk
5332c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
5333c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
5334c609719bSwdenk
5335c609719bSwdenkBuilding requires a cross environment; it is known to work on
5336c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
5337c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
5338c609719bSwdenkNote that the cross-powerpc package does not install include files;
5339c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
5340c609719bSwdenkmissing.  This file has to be installed and patched manually:
5341c609719bSwdenk
5342c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
5343c609719bSwdenk	# mkdir powerpc
5344c609719bSwdenk	# ln -s powerpc machine
5345c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
5346c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
5347c609719bSwdenk
5348c609719bSwdenkNative builds *don't* work due to incompatibilities between native
5349c609719bSwdenkand U-Boot include files.
5350c609719bSwdenk
5351c609719bSwdenkBooting assumes that (the first part of) the image booted is a
5352c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
5353c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
5354c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
53552a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
5356c609719bSwdenk
5357c609719bSwdenk
5358c609719bSwdenkImplementation Internals:
5359c609719bSwdenk=========================
5360c609719bSwdenk
5361c609719bSwdenkThe following is not intended to be a complete description of every
5362c609719bSwdenkimplementation detail. However, it should help to understand the
5363c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
5364c609719bSwdenkhardware.
5365c609719bSwdenk
5366c609719bSwdenk
5367c609719bSwdenkInitial Stack, Global Data:
5368c609719bSwdenk---------------------------
5369c609719bSwdenk
5370c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
5371c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
5372c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
5373c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
5374c609719bSwdenkis not initialized as zero. To be able to get a C environment working
5375c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
5376c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
5377c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
5378c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
5379c609719bSwdenklocked as (mis-) used as memory, etc.
5380c609719bSwdenk
53817152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
53820668236bSWolfgang Denk	U-Boot mailing list:
538343d9616cSwdenk
538443d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
538543d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
538643d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
538743d9616cSwdenk	...
538843d9616cSwdenk
538943d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
539043d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
539143d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
539243d9616cSwdenk	is that the cache is being used as a temporary supply of
539343d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
539411ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
539543d9616cSwdenk	can see how this works by studying the cache architecture and
539643d9616cSwdenk	operation in the architecture and processor-specific manuals.
539743d9616cSwdenk
539843d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
539943d9616cSwdenk	is another option for the system designer to use as an
540011ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
540143d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
540243d9616cSwdenk	board designers haven't used it for something that would
540343d9616cSwdenk	cause you grief during the initial boot! It is frequently not
540443d9616cSwdenk	used.
540543d9616cSwdenk
54066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
540743d9616cSwdenk	with your processor/board/system design. The default value
540843d9616cSwdenk	you will find in any recent u-boot distribution in
54098a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
541043d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
541143d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
541243d9616cSwdenk	that are supposed to respond to that address! That code in
541343d9616cSwdenk	start.S has been around a while and should work as is when
541443d9616cSwdenk	you get the config right.
541543d9616cSwdenk
541643d9616cSwdenk	-Chris Hallinan
541743d9616cSwdenk	DS4.COM, Inc.
541843d9616cSwdenk
5419c609719bSwdenkIt is essential to remember this, since it has some impact on the C
5420c609719bSwdenkcode for the initialization procedures:
5421c609719bSwdenk
5422c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
5423c609719bSwdenk  to write it.
5424c609719bSwdenk
542511ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
5426c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
54277152b1d0Swdenk  zation is performed later (when relocating to RAM).
5428c609719bSwdenk
5429c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
5430c609719bSwdenk  that.
5431c609719bSwdenk
5432c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
5433c609719bSwdenknormal global data to share information beween the code. But it
5434c609719bSwdenkturned out that the implementation of U-Boot can be greatly
5435c609719bSwdenksimplified by making a global data structure (gd_t) available to all
5436c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
5437c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
5438c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
5439c609719bSwdenkplace a pointer (gd) to the global data into a register which we
5440c609719bSwdenkreserve for this purpose.
5441c609719bSwdenk
54427152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
5443c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
5444c609719bSwdenkGCC's implementation.
5445c609719bSwdenk
5446c609719bSwdenkFor PowerPC, the following registers have specific use:
5447c609719bSwdenk	R1:	stack pointer
5448e7670f6cSWolfgang Denk	R2:	reserved for system use
5449c609719bSwdenk	R3-R4:	parameter passing and return values
5450c609719bSwdenk	R5-R10: parameter passing
5451c609719bSwdenk	R13:	small data area pointer
5452c609719bSwdenk	R30:	GOT pointer
5453c609719bSwdenk	R31:	frame pointer
5454c609719bSwdenk
5455e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
5456e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
5457e6bee808SJoakim Tjernlund	going back and forth between asm and C)
5458c609719bSwdenk
5459e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
5460c609719bSwdenk
5461c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
5462c609719bSwdenk    address of the global data structure is known at compile time),
5463c609719bSwdenk    but it turned out that reserving a register results in somewhat
5464c609719bSwdenk    smaller code - although the code savings are not that big (on
5465c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
5466c609719bSwdenk    624 text + 127 data).
5467c609719bSwdenk
5468c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
54694c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
54704c58eb55SMike Frysinger
5471c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
54724c58eb55SMike Frysinger
5473c609719bSwdenkOn ARM, the following registers are used:
5474c609719bSwdenk
5475c609719bSwdenk	R0:	function argument word/integer result
5476c609719bSwdenk	R1-R3:	function argument word
5477c609719bSwdenk	R9:	GOT pointer
5478c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
5479c609719bSwdenk	R11:	argument (frame) pointer
5480c609719bSwdenk	R12:	temporary workspace
5481c609719bSwdenk	R13:	stack pointer
5482c609719bSwdenk	R14:	link register
5483c609719bSwdenk	R15:	program counter
5484c609719bSwdenk
5485c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
5486c609719bSwdenk
54870df01fd3SThomas ChouOn Nios II, the ABI is documented here:
54880df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
54890df01fd3SThomas Chou
54900df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
54910df01fd3SThomas Chou
54920df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
54930df01fd3SThomas Chou    to access small data sections, so gp is free.
54940df01fd3SThomas Chou
5495afc1ce82SMacpaul LinOn NDS32, the following registers are used:
5496afc1ce82SMacpaul Lin
5497afc1ce82SMacpaul Lin	R0-R1:	argument/return
5498afc1ce82SMacpaul Lin	R2-R5:	argument
5499afc1ce82SMacpaul Lin	R15:	temporary register for assembler
5500afc1ce82SMacpaul Lin	R16:	trampoline register
5501afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
5502afc1ce82SMacpaul Lin	R29:	global pointer (GP)
5503afc1ce82SMacpaul Lin	R30:	link register (LP)
5504afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
5505afc1ce82SMacpaul Lin	PC:	program counter (PC)
5506afc1ce82SMacpaul Lin
5507afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
5508afc1ce82SMacpaul Lin
5509d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5510d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
5511c609719bSwdenk
5512c609719bSwdenkMemory Management:
5513c609719bSwdenk------------------
5514c609719bSwdenk
5515c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
5516c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
5517c609719bSwdenk
5518c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
5519c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
5520c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
5521c609719bSwdenkphysical memory banks.
5522c609719bSwdenk
5523c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
5524c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5525c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
5526c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
55276d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
5528c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
5529c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
5530c609719bSwdenk
5531c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
5532c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
5533c609719bSwdenk
5534c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
5535c609719bSwdenkthis:
5536c609719bSwdenk
5537c609719bSwdenk	0x0000 0000	Exception Vector code
5538c609719bSwdenk	      :
5539c609719bSwdenk	0x0000 1FFF
5540c609719bSwdenk	0x0000 2000	Free for Application Use
5541c609719bSwdenk	      :
5542c609719bSwdenk	      :
5543c609719bSwdenk
5544c609719bSwdenk	      :
5545c609719bSwdenk	      :
5546c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
5547c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
5548c609719bSwdenk	0x00FC 0000	Malloc Arena
5549c609719bSwdenk	      :
5550c609719bSwdenk	0x00FD FFFF
5551c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
5552c609719bSwdenk	...		eventually: LCD or video framebuffer
5553c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
5554c609719bSwdenk	0x00FF FFFF	[End of RAM]
5555c609719bSwdenk
5556c609719bSwdenk
5557c609719bSwdenkSystem Initialization:
5558c609719bSwdenk----------------------
5559c609719bSwdenk
5560c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
556111ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
5562c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
55637152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
5564c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
5565c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
5566c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
5567c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
5568c609719bSwdenkthe caches and the SIU.
5569c609719bSwdenk
5570c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
5571c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
5572c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5573c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5574c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
5575c609719bSwdenksimple memory test is run that determines the size of the SDRAM
5576c609719bSwdenkbanks.
5577c609719bSwdenk
5578c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
55797152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
5580c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
5581c609719bSwdenk0x00000000, with any additional banks following immediately to create
5582c609719bSwdenkcontiguous memory starting from 0.
5583c609719bSwdenk
5584c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
5585c609719bSwdenkand allocates memory for use by malloc() and for the global Board
5586c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
5587c609719bSwdenkpages, and the final stack is set up.
5588c609719bSwdenk
5589c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
5590c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
5591c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
5592c609719bSwdenknew address in RAM.
5593c609719bSwdenk
5594c609719bSwdenk
5595c609719bSwdenkU-Boot Porting Guide:
5596c609719bSwdenk----------------------
5597c609719bSwdenk
5598c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
55996aff3115Swdenklist, October 2002]
5600c609719bSwdenk
5601c609719bSwdenk
5602c609719bSwdenkint main(int argc, char *argv[])
5603c609719bSwdenk{
5604c609719bSwdenk	sighandler_t no_more_time;
5605c609719bSwdenk
5606c609719bSwdenk	signal(SIGALRM, no_more_time);
5607c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
5608c609719bSwdenk
5609c609719bSwdenk	if (available_money > available_manpower) {
56106c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
5611c609719bSwdenk		return 0;
5612c609719bSwdenk	}
5613c609719bSwdenk
5614c609719bSwdenk	Download latest U-Boot source;
5615c609719bSwdenk
56160668236bSWolfgang Denk	Subscribe to u-boot mailing list;
56176aff3115Swdenk
56186c3fef28SJerry Van Baren	if (clueless)
5619c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
5620c609719bSwdenk
5621c609719bSwdenk	while (learning) {
5622c609719bSwdenk		Read the README file in the top level directory;
56237cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
56246c3fef28SJerry Van Baren		Read applicable doc/*.README;
5625c609719bSwdenk		Read the source, Luke;
56266c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
5627c609719bSwdenk	}
5628c609719bSwdenk
56296c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
56306c3fef28SJerry Van Baren		Buy a BDI3000;
56316c3fef28SJerry Van Baren	else
5632c609719bSwdenk		Add a lot of aggravation and time;
5633c609719bSwdenk
56346c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
56356c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
56366c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
56376c3fef28SJerry Van Baren	} else {
5638c609719bSwdenk		Create your own board support subdirectory;
56396c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
56406c3fef28SJerry Van Baren	}
56416c3fef28SJerry Van Baren	Edit new board/<myboard> files
56426c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
5643c609719bSwdenk
56446c3fef28SJerry Van Baren	while (!accepted) {
5645c609719bSwdenk		while (!running) {
5646c609719bSwdenk			do {
5647c609719bSwdenk				Add / modify source code;
5648c609719bSwdenk			} until (compiles);
5649c609719bSwdenk			Debug;
5650c609719bSwdenk			if (clueless)
5651c609719bSwdenk				email("Hi, I am having problems...");
5652c609719bSwdenk		}
56536c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
56546c3fef28SJerry Van Baren		if (reasonable critiques)
56556c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
56566c3fef28SJerry Van Baren		else
56576c3fef28SJerry Van Baren			Defend code as written;
56586c3fef28SJerry Van Baren	}
5659c609719bSwdenk
5660c609719bSwdenk	return 0;
5661c609719bSwdenk}
5662c609719bSwdenk
5663c609719bSwdenkvoid no_more_time (int sig)
5664c609719bSwdenk{
5665c609719bSwdenk      hire_a_guru();
5666c609719bSwdenk}
5667c609719bSwdenk
5668c609719bSwdenk
5669c609719bSwdenkCoding Standards:
5670c609719bSwdenk-----------------
5671c609719bSwdenk
5672c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
56732c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
56747ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
5675c609719bSwdenk
56762c051651SDetlev ZundelSource files originating from a different project (for example the
56772c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
56782c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
56792c051651SDetlev Zundelsources.
56802c051651SDetlev Zundel
56812c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
56822c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
56832c051651SDetlev Zundelin your code.
5684c609719bSwdenk
5685c178d3daSwdenkPlease also stick to the following formatting rules:
5686180d3f74Swdenk- remove any trailing white space
56877ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
5688180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
56897ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
5690180d3f74Swdenk- do not add trailing empty lines to source files
5691180d3f74Swdenk
5692c609719bSwdenkSubmissions which do not conform to the standards may be returned
5693c609719bSwdenkwith a request to reformat the changes.
5694c609719bSwdenk
5695c609719bSwdenk
5696c609719bSwdenkSubmitting Patches:
5697c609719bSwdenk-------------------
5698c609719bSwdenk
5699c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
5700c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
5701c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
5702c609719bSwdenk
57030d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
5704218ca724SWolfgang Denk
57050668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
57060668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
57070668236bSWolfgang Denk
5708c609719bSwdenkWhen you send a patch, please include the following information with
5709c609719bSwdenkit:
5710c609719bSwdenk
5711c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
5712c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
5713c609719bSwdenk  patch actually fixes something.
5714c609719bSwdenk
5715c609719bSwdenk* For new features: a description of the feature and your
5716c609719bSwdenk  implementation.
5717c609719bSwdenk
5718c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
5719c609719bSwdenk
5720c609719bSwdenk* For major contributions, your entry to the CREDITS file
5721c609719bSwdenk
5722c609719bSwdenk* When you add support for a new board, don't forget to add this
57237ca9296eSWolfgang Denk  board to the MAINTAINERS file, too.
5724c609719bSwdenk
5725c609719bSwdenk* If your patch adds new configuration options, don't forget to
5726c609719bSwdenk  document these in the README file.
5727c609719bSwdenk
5728218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
5729218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
57307ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
5731218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
5732218ca724SWolfgang Denk  with some other mail clients.
5733c609719bSwdenk
5734218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
5735218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
5736218ca724SWolfgang Denk  GNU diff.
57376dff5529Swdenk
5738218ca724SWolfgang Denk  The current directory when running this command shall be the parent
5739218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
5740218ca724SWolfgang Denk  your patch includes sufficient directory information for the
5741218ca724SWolfgang Denk  affected files).
5742218ca724SWolfgang Denk
5743218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
5744218ca724SWolfgang Denk  and compressed attachments must not be used.
5745c609719bSwdenk
574652f52c14Swdenk* If one logical set of modifications affects or creates several
574752f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
574852f52c14Swdenk
574952f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
575052f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
575152f52c14Swdenk
575252f52c14Swdenk
5753c609719bSwdenkNotes:
5754c609719bSwdenk
5755c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
5756c609719bSwdenk  source tree and make sure that no errors or warnings are reported
5757c609719bSwdenk  for any of the boards.
5758c609719bSwdenk
5759c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
5760c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
5761c609719bSwdenk  returned with a request to re-formatting / split it.
5762c609719bSwdenk
5763c609719bSwdenk* If you modify existing code, make sure that your new code does not
5764c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
5765c609719bSwdenk  When adding new features, these should compile conditionally only
5766c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
5767c609719bSwdenk  disabled must not need more memory than the old code without your
5768c609719bSwdenk  modification.
576990dc6704Swdenk
57700668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
57710668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
57720668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
57730668236bSWolfgang Denk  bigger than the size limit should be avoided.
5774