xref: /openbmc/u-boot/README (revision 7d861d95a315852532d581884b3b72536c25032c)
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      /mpc8220		Files specific to Freescale MPC8220 CPUs
2058d321b81SPeter Tyser      /mpc824x		Files specific to Freescale MPC824x CPUs
2068d321b81SPeter Tyser      /mpc8260		Files specific to Freescale MPC8260 CPUs
2078d321b81SPeter Tyser      /mpc85xx		Files specific to Freescale MPC85xx CPUs
2088d321b81SPeter Tyser      /ppc4xx		Files specific to AMCC PowerPC 4xx CPUs
2098d321b81SPeter Tyser    /lib		Architecture specific library files
2108d321b81SPeter Tyser  /sh			Files generic to SH architecture
2118d321b81SPeter Tyser    /cpu		CPU specific files
2128d321b81SPeter Tyser      /sh2		Files specific to sh2 CPUs
2138d321b81SPeter Tyser      /sh3		Files specific to sh3 CPUs
2148d321b81SPeter Tyser      /sh4		Files specific to sh4 CPUs
2158d321b81SPeter Tyser    /lib		Architecture specific library files
2168d321b81SPeter Tyser  /sparc		Files generic to SPARC architecture
2178d321b81SPeter Tyser    /cpu		CPU specific files
2188d321b81SPeter Tyser      /leon2		Files specific to Gaisler LEON2 SPARC CPU
2198d321b81SPeter Tyser      /leon3		Files specific to Gaisler LEON3 SPARC CPU
2208d321b81SPeter Tyser    /lib		Architecture specific library files
2218d321b81SPeter Tyser/api			Machine/arch independent API for external apps
2228d321b81SPeter Tyser/board			Board dependent files
2238d321b81SPeter Tyser/common			Misc architecture independent functions
2248d321b81SPeter Tyser/disk			Code for disk drive partition handling
2258d321b81SPeter Tyser/doc			Documentation (don't expect too much)
2268d321b81SPeter Tyser/drivers		Commonly used device drivers
2278d321b81SPeter Tyser/examples		Example code for standalone applications, etc.
2288d321b81SPeter Tyser/fs			Filesystem code (cramfs, ext2, jffs2, etc.)
2298d321b81SPeter Tyser/include		Header Files
2308d321b81SPeter Tyser/lib			Files generic to all architectures
2318d321b81SPeter Tyser  /libfdt		Library files to support flattened device trees
2328d321b81SPeter Tyser  /lzma			Library files to support LZMA decompression
2338d321b81SPeter Tyser  /lzo			Library files to support LZO decompression
2348d321b81SPeter Tyser/net			Networking code
2358d321b81SPeter Tyser/post			Power On Self Test
2368d321b81SPeter Tyser/rtc			Real Time Clock drivers
2378d321b81SPeter Tyser/tools			Tools to build S-Record or U-Boot images, etc.
238c609719bSwdenk
239c609719bSwdenkSoftware Configuration:
240c609719bSwdenk=======================
241c609719bSwdenk
242c609719bSwdenkConfiguration is usually done using C preprocessor defines; the
243c609719bSwdenkrationale behind that is to avoid dead code whenever possible.
244c609719bSwdenk
245c609719bSwdenkThere are two classes of configuration variables:
246c609719bSwdenk
247c609719bSwdenk* Configuration _OPTIONS_:
248c609719bSwdenk  These are selectable by the user and have names beginning with
249c609719bSwdenk  "CONFIG_".
250c609719bSwdenk
251c609719bSwdenk* Configuration _SETTINGS_:
252c609719bSwdenk  These depend on the hardware etc. and should not be meddled with if
253c609719bSwdenk  you don't know what you're doing; they have names beginning with
2546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  "CONFIG_SYS_".
255c609719bSwdenk
256c609719bSwdenkLater we will add a configuration tool - probably similar to or even
257c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to
258c609719bSwdenkdo the configuration by hand, which means creating some symbolic
259c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards
260c609719bSwdenkas an example here.
261c609719bSwdenk
262c609719bSwdenk
263c609719bSwdenkSelection of Processor Architecture and Board Type:
264c609719bSwdenk---------------------------------------------------
265c609719bSwdenk
266c609719bSwdenkFor all supported boards there are ready-to-use default
267c609719bSwdenkconfigurations available; just type "make <board_name>_config".
268c609719bSwdenk
269c609719bSwdenkExample: For a TQM823L module type:
270c609719bSwdenk
271c609719bSwdenk	cd u-boot
272c609719bSwdenk	make TQM823L_config
273c609719bSwdenk
27411ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well;
275c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent
276c609719bSwdenkdirectory according to the instructions in cogent/README.
277c609719bSwdenk
278c609719bSwdenk
279c609719bSwdenkConfiguration Options:
280c609719bSwdenk----------------------
281c609719bSwdenk
282c609719bSwdenkConfiguration depends on the combination of board and CPU type; all
283c609719bSwdenksuch information is kept in a configuration file
284c609719bSwdenk"include/configs/<board_name>.h".
285c609719bSwdenk
286c609719bSwdenkExample: For a TQM823L module, all configuration settings are in
287c609719bSwdenk"include/configs/TQM823L.h".
288c609719bSwdenk
289c609719bSwdenk
2907f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux
2917f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to
2927f6c2cbcSwdenkbuild a config tool - later.
2937f6c2cbcSwdenk
2947f6c2cbcSwdenk
295c609719bSwdenkThe following options need to be configured:
296c609719bSwdenk
2972628114eSKim Phillips- CPU Type:	Define exactly one, e.g. CONFIG_MPC85XX.
298c609719bSwdenk
2992628114eSKim Phillips- Board Type:	Define exactly one, e.g. CONFIG_MPC8540ADS.
3006ccec449SWolfgang Denk
3016ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
30209ea0de0SHaavard Skinnemoen		Define exactly one, e.g. CONFIG_ATSTK1002
303c609719bSwdenk
304c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined)
305c609719bSwdenk		Define exactly one of
306c609719bSwdenk		CONFIG_CMA286_60_OLD
307c609719bSwdenk--- FIXME --- not tested yet:
308c609719bSwdenk		CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
309c609719bSwdenk		CONFIG_CMA287_23, CONFIG_CMA287_50
310c609719bSwdenk
311c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined)
312c609719bSwdenk		Define exactly one of
313c609719bSwdenk		CONFIG_CMA101, CONFIG_CMA102
314c609719bSwdenk
315c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
316c609719bSwdenk		Define one or more of
317c609719bSwdenk		CONFIG_CMA302
318c609719bSwdenk
319c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
320c609719bSwdenk		Define one or more of
321c609719bSwdenk		CONFIG_LCD_HEARTBEAT	- update a character position on
32211ccc33fSMarcel Ziswiler					  the LCD display every second with
323c609719bSwdenk					  a "rotator" |\-/|\-/
324c609719bSwdenk
3252535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined)
3262535d602Swdenk		CONFIG_ADSTYPE
3272535d602Swdenk		Possible values are:
3286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8260ADS	- original MPC8260ADS
3296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8266ADS	- MPC8266ADS
3306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_PQ2FADS	- PQ2FADS-ZU or PQ2FADS-VR
3316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_8272ADS	- MPC8272ADS
3322535d602Swdenk
333cf946c6dSLei Wen- Marvell Family Member
334cf946c6dSLei Wen		CONFIG_SYS_MVFS		- define it if you want to enable
335cf946c6dSLei Wen					  multiple fs option at one time
336cf946c6dSLei Wen					  for marvell soc family
337cf946c6dSLei Wen
338c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined)
339c609719bSwdenk		Define exactly one of
340c609719bSwdenk		CONFIG_MPC8240, CONFIG_MPC8245
341c609719bSwdenk
34211ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU)
34366ca92a5Swdenk		CONFIG_8xx_GCLK_FREQ	- deprecated: CPU clock if
34466ca92a5Swdenk					  get_gclk_freq() cannot work
3455da627a4Swdenk					  e.g. if there is no 32KHz
3465da627a4Swdenk					  reference PIT/RTC clock
34766ca92a5Swdenk		CONFIG_8xx_OSCLK	- PLL input clock (either EXTCLK
34866ca92a5Swdenk					  or XTAL/EXTAL)
349c609719bSwdenk
35066ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
3516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MIN
3526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_8xx_CPUCLK_MAX
35366ca92a5Swdenk		CONFIG_8xx_CPUCLK_DEFAULT
35475d1ea7fSwdenk			See doc/README.MPC866
35575d1ea7fSwdenk
3566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MEASURE_CPUCLK
35775d1ea7fSwdenk
35875d1ea7fSwdenk		Define this to measure the actual CPU clock instead
35975d1ea7fSwdenk		of relying on the correctness of the configured
36075d1ea7fSwdenk		values. Mostly useful for board bringup to make sure
36175d1ea7fSwdenk		the PLL is locked at the intended frequency. Note
36275d1ea7fSwdenk		that this requires a (stable) reference clock (32 kHz
3636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		RTC clock or CONFIG_SYS_8XX_XIN)
36475d1ea7fSwdenk
365506f3918SHeiko Schocher		CONFIG_SYS_DELAYED_ICACHE
366506f3918SHeiko Schocher
367506f3918SHeiko Schocher		Define this option if you want to enable the
368506f3918SHeiko Schocher		ICache only when Code runs from RAM.
369506f3918SHeiko Schocher
37066412c63SKumar Gala- 85xx CPU Options:
371ffd06e02SYork Sun		CONFIG_SYS_PPC64
372ffd06e02SYork Sun
373ffd06e02SYork Sun		Specifies that the core is a 64-bit PowerPC implementation (implements
374ffd06e02SYork Sun		the "64" category of the Power ISA). This is necessary for ePAPR
375ffd06e02SYork Sun		compliance, among other possible reasons.
376ffd06e02SYork Sun
37766412c63SKumar Gala		CONFIG_SYS_FSL_TBCLK_DIV
37866412c63SKumar Gala
37966412c63SKumar Gala		Defines the core time base clock divider ratio compared to the
38066412c63SKumar Gala		system clock.  On most PQ3 devices this is 8, on newer QorIQ
38166412c63SKumar Gala		devices it can be 16 or 32.  The ratio varies from SoC to Soc.
38266412c63SKumar Gala
3838f29084aSKumar Gala		CONFIG_SYS_FSL_PCIE_COMPAT
3848f29084aSKumar Gala
3858f29084aSKumar Gala		Defines the string to utilize when trying to match PCIe device
3868f29084aSKumar Gala		tree nodes for the given platform.
3878f29084aSKumar Gala
388afa6b551SPrabhakar Kushwaha		CONFIG_SYS_PPC_E500_DEBUG_TLB
389afa6b551SPrabhakar Kushwaha
390afa6b551SPrabhakar Kushwaha		Enables a temporary TLB entry to be used during boot to work
391afa6b551SPrabhakar Kushwaha		around limitations in e500v1 and e500v2 external debugger
392afa6b551SPrabhakar Kushwaha		support. This reduces the portions of the boot code where
393afa6b551SPrabhakar Kushwaha		breakpoints and single stepping do not work.  The value of this
394afa6b551SPrabhakar Kushwaha		symbol should be set to the TLB1 entry to be used for this
395afa6b551SPrabhakar Kushwaha		purpose.
396afa6b551SPrabhakar Kushwaha
39733eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510
39833eee330SScott Wood
39933eee330SScott Wood		Enables a workaround for erratum A004510.  If set,
40033eee330SScott Wood		then CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV and
40133eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY must be set.
40233eee330SScott Wood
40333eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV
40433eee330SScott Wood		CONFIG_SYS_FSL_ERRATUM_A004510_SVR_REV2 (optional)
40533eee330SScott Wood
40633eee330SScott Wood		Defines one or two SoC revisions (low 8 bits of SVR)
40733eee330SScott Wood		for which the A004510 workaround should be applied.
40833eee330SScott Wood
40933eee330SScott Wood		The rest of SVR is either not relevant to the decision
41033eee330SScott Wood		of whether the erratum is present (e.g. p2040 versus
41133eee330SScott Wood		p2041) or is implied by the build target, which controls
41233eee330SScott Wood		whether CONFIG_SYS_FSL_ERRATUM_A004510 is set.
41333eee330SScott Wood
41433eee330SScott Wood		See Freescale App Note 4493 for more information about
41533eee330SScott Wood		this erratum.
41633eee330SScott Wood
41733eee330SScott Wood		CONFIG_SYS_FSL_CORENET_SNOOPVEC_COREONLY
41833eee330SScott Wood
41933eee330SScott Wood		This is the value to write into CCSR offset 0x18600
42033eee330SScott Wood		according to the A004510 workaround.
42133eee330SScott Wood
4226cb461b4SDaniel Schwierzeck- Generic CPU options:
4236cb461b4SDaniel Schwierzeck		CONFIG_SYS_BIG_ENDIAN, CONFIG_SYS_LITTLE_ENDIAN
4246cb461b4SDaniel Schwierzeck
4256cb461b4SDaniel Schwierzeck		Defines the endianess of the CPU. Implementation of those
4266cb461b4SDaniel Schwierzeck		values is arch specific.
4276cb461b4SDaniel Schwierzeck
4280b953ffcSMarkus Klotzbuecher- Intel Monahans options:
4296d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO
4300b953ffcSMarkus Klotzbuecher
4310b953ffcSMarkus Klotzbuecher		Defines the Monahans run mode to oscillator
4320b953ffcSMarkus Klotzbuecher		ratio. Valid values are 8, 16, 24, 31. The core
4330b953ffcSMarkus Klotzbuecher		frequency is this value multiplied by 13 MHz.
4340b953ffcSMarkus Klotzbuecher
4356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO
4360b953ffcSMarkus Klotzbuecher
4370b953ffcSMarkus Klotzbuecher		Defines the Monahans turbo mode to oscillator
4380b953ffcSMarkus Klotzbuecher		ratio. Valid values are 1 (default if undefined) and
4390b953ffcSMarkus Klotzbuecher		2. The core frequency as calculated above is multiplied
4400b953ffcSMarkus Klotzbuecher		by this value.
4410b953ffcSMarkus Klotzbuecher
44292bbd64eSDaniel Schwierzeck- MIPS CPU options:
44392bbd64eSDaniel Schwierzeck		CONFIG_SYS_INIT_SP_OFFSET
44492bbd64eSDaniel Schwierzeck
44592bbd64eSDaniel Schwierzeck		Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack
44692bbd64eSDaniel Schwierzeck		pointer. This is needed for the temporary stack before
44792bbd64eSDaniel Schwierzeck		relocation.
44892bbd64eSDaniel Schwierzeck
44992bbd64eSDaniel Schwierzeck		CONFIG_SYS_MIPS_CACHE_MODE
45092bbd64eSDaniel Schwierzeck
45192bbd64eSDaniel Schwierzeck		Cache operation mode for the MIPS CPU.
45292bbd64eSDaniel Schwierzeck		See also arch/mips/include/asm/mipsregs.h.
45392bbd64eSDaniel Schwierzeck		Possible values are:
45492bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NO_WA
45592bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_WA
45692bbd64eSDaniel Schwierzeck			CONF_CM_UNCACHED
45792bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_NONCOHERENT
45892bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CE
45992bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_COW
46092bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_CUW
46192bbd64eSDaniel Schwierzeck			CONF_CM_CACHABLE_ACCELERATED
46292bbd64eSDaniel Schwierzeck
46392bbd64eSDaniel Schwierzeck		CONFIG_SYS_XWAY_EBU_BOOTCFG
46492bbd64eSDaniel Schwierzeck
46592bbd64eSDaniel Schwierzeck		Special option for Lantiq XWAY SoCs for booting from NOR flash.
46692bbd64eSDaniel Schwierzeck		See also arch/mips/cpu/mips32/start.S.
46792bbd64eSDaniel Schwierzeck
46892bbd64eSDaniel Schwierzeck		CONFIG_XWAY_SWAP_BYTES
46992bbd64eSDaniel Schwierzeck
47092bbd64eSDaniel Schwierzeck		Enable compilation of tools/xway-swap-bytes needed for Lantiq
47192bbd64eSDaniel Schwierzeck		XWAY SoCs for booting from NOR flash. The U-Boot image needs to
47292bbd64eSDaniel Schwierzeck		be swapped if a flash programmer is used.
47392bbd64eSDaniel Schwierzeck
474b67d8816SChristian Riesch- ARM options:
475b67d8816SChristian Riesch		CONFIG_SYS_EXCEPTION_VECTORS_HIGH
476b67d8816SChristian Riesch
477b67d8816SChristian Riesch		Select high exception vectors of the ARM core, e.g., do not
478b67d8816SChristian Riesch		clear the V bit of the c1 register of CP15.
479b67d8816SChristian Riesch
4805356f545SAneesh V		CONFIG_SYS_THUMB_BUILD
4815356f545SAneesh V
4825356f545SAneesh V		Use this flag to build U-Boot using the Thumb instruction
4835356f545SAneesh V		set for ARM architectures. Thumb instruction set provides
4845356f545SAneesh V		better code density. For ARM architectures that support
4855356f545SAneesh V		Thumb2 this flag will result in Thumb2 code generated by
4865356f545SAneesh V		GCC.
4875356f545SAneesh V
488c5d4752cSStephen Warren		CONFIG_ARM_ERRATA_716044
4890678587fSStephen Warren		CONFIG_ARM_ERRATA_742230
4900678587fSStephen Warren		CONFIG_ARM_ERRATA_743622
4910678587fSStephen Warren		CONFIG_ARM_ERRATA_751472
4920678587fSStephen Warren
4930678587fSStephen Warren		If set, the workarounds for these ARM errata are applied early
4940678587fSStephen Warren		during U-Boot startup. Note that these options force the
4950678587fSStephen Warren		workarounds to be applied; no CPU-type/version detection
4960678587fSStephen Warren		exists, unlike the similar options in the Linux kernel. Do not
4970678587fSStephen Warren		set these options unless they apply!
4980678587fSStephen Warren
499795659dcSStephen Warren- CPU timer options:
500795659dcSStephen Warren		CONFIG_SYS_HZ
501795659dcSStephen Warren
502795659dcSStephen Warren		The frequency of the timer returned by get_timer().
503795659dcSStephen Warren		get_timer() must operate in milliseconds and this CONFIG
504795659dcSStephen Warren		option must be set to 1000.
505795659dcSStephen Warren
5065da627a4Swdenk- Linux Kernel Interface:
507c609719bSwdenk		CONFIG_CLOCKS_IN_MHZ
508c609719bSwdenk
509c609719bSwdenk		U-Boot stores all clock information in Hz
510c609719bSwdenk		internally. For binary compatibility with older Linux
511c609719bSwdenk		kernels (which expect the clocks passed in the
512c609719bSwdenk		bd_info data to be in MHz) the environment variable
513c609719bSwdenk		"clocks_in_mhz" can be defined so that U-Boot
514c609719bSwdenk		converts clock data to MHZ before passing it to the
515c609719bSwdenk		Linux kernel.
516c609719bSwdenk		When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
517c609719bSwdenk		"clocks_in_mhz=1" is automatically included in the
518c609719bSwdenk		default environment.
519c609719bSwdenk
5205da627a4Swdenk		CONFIG_MEMSIZE_IN_BYTES		[relevant for MIPS only]
5215da627a4Swdenk
52211ccc33fSMarcel Ziswiler		When transferring memsize parameter to linux, some versions
5235da627a4Swdenk		expect it to be in bytes, others in MB.
5245da627a4Swdenk		Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
5255da627a4Swdenk
526fec6d9eeSGerald Van Baren		CONFIG_OF_LIBFDT
527f57f70aaSWolfgang Denk
528f57f70aaSWolfgang Denk		New kernel versions are expecting firmware settings to be
529213bf8c8SGerald Van Baren		passed using flattened device trees (based on open firmware
530213bf8c8SGerald Van Baren		concepts).
531213bf8c8SGerald Van Baren
532213bf8c8SGerald Van Baren		CONFIG_OF_LIBFDT
533213bf8c8SGerald Van Baren		 * New libfdt-based support
534213bf8c8SGerald Van Baren		 * Adds the "fdt" command
5353bb342fcSKim Phillips		 * The bootm command automatically updates the fdt
536213bf8c8SGerald Van Baren
537b55ae402SMarcel Ziswiler		OF_CPU - The proper name of the cpus node (only required for
538b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
539b55ae402SMarcel Ziswiler		OF_SOC - The proper name of the soc node (only required for
540b55ae402SMarcel Ziswiler			MPC512X and MPC5xxx based boards).
541f57f70aaSWolfgang Denk		OF_TBCLK - The timebase frequency.
542c2871f03SKumar Gala		OF_STDOUT_PATH - The path to the console device
543f57f70aaSWolfgang Denk
54411ccc33fSMarcel Ziswiler		boards with QUICC Engines require OF_QE to set UCC MAC
54511ccc33fSMarcel Ziswiler		addresses
5463bb342fcSKim Phillips
5474e253137SKumar Gala		CONFIG_OF_BOARD_SETUP
5484e253137SKumar Gala
5494e253137SKumar Gala		Board code has addition modification that it wants to make
5504e253137SKumar Gala		to the flat device tree before handing it off to the kernel
5516705d81eSwdenk
5520267768eSMatthew McClintock		CONFIG_OF_BOOT_CPU
5530267768eSMatthew McClintock
55411ccc33fSMarcel Ziswiler		This define fills in the correct boot CPU in the boot
5550267768eSMatthew McClintock		param header, the default value is zero if undefined.
5560267768eSMatthew McClintock
5573887c3fbSHeiko Schocher		CONFIG_OF_IDE_FIXUP
5583887c3fbSHeiko Schocher
5593887c3fbSHeiko Schocher		U-Boot can detect if an IDE device is present or not.
5603887c3fbSHeiko Schocher		If not, and this new config option is activated, U-Boot
5613887c3fbSHeiko Schocher		removes the ATA node from the DTS before booting Linux,
5623887c3fbSHeiko Schocher		so the Linux IDE driver does not probe the device and
5633887c3fbSHeiko Schocher		crash. This is needed for buggy hardware (uc101) where
5643887c3fbSHeiko Schocher		no pull down resistor is connected to the signal IDE5V_DD7.
5653887c3fbSHeiko Schocher
5667eb29398SIgor Grinberg		CONFIG_MACH_TYPE	[relevant for ARM only][mandatory]
5677eb29398SIgor Grinberg
5687eb29398SIgor Grinberg		This setting is mandatory for all boards that have only one
5697eb29398SIgor Grinberg		machine type and must be used to specify the machine type
5707eb29398SIgor Grinberg		number as it appears in the ARM machine registry
5717eb29398SIgor Grinberg		(see http://www.arm.linux.org.uk/developer/machines/).
5727eb29398SIgor Grinberg		Only boards that have multiple machine types supported
5737eb29398SIgor Grinberg		in a single configuration file and the machine type is
5747eb29398SIgor Grinberg		runtime discoverable, do not have to use this setting.
5757eb29398SIgor Grinberg
5760b2f4ecaSNiklaus Giger- vxWorks boot parameters:
5770b2f4ecaSNiklaus Giger
5780b2f4ecaSNiklaus Giger		bootvx constructs a valid bootline using the following
5790b2f4ecaSNiklaus Giger		environments variables: bootfile, ipaddr, serverip, hostname.
5800b2f4ecaSNiklaus Giger		It loads the vxWorks image pointed bootfile.
5810b2f4ecaSNiklaus Giger
5820b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name
5830b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address
5840b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server
5850b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters
5860b2f4ecaSNiklaus Giger
5870b2f4ecaSNiklaus Giger		CONFIG_SYS_VXWORKS_ADD_PARAMS
5880b2f4ecaSNiklaus Giger
5890b2f4ecaSNiklaus Giger		Add it at the end of the bootline. E.g "u=username pw=secret"
5900b2f4ecaSNiklaus Giger
5910b2f4ecaSNiklaus Giger		Note: If a "bootargs" environment is defined, it will overwride
5920b2f4ecaSNiklaus Giger		the defaults discussed just above.
5930b2f4ecaSNiklaus Giger
5942c451f78SAneesh V- Cache Configuration:
5952c451f78SAneesh V		CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot
5962c451f78SAneesh V		CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot
5972c451f78SAneesh V		CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot
5982c451f78SAneesh V
59993bc2193SAneesh V- Cache Configuration for ARM:
60093bc2193SAneesh V		CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache
60193bc2193SAneesh V				      controller
60293bc2193SAneesh V		CONFIG_SYS_PL310_BASE - Physical base address of PL310
60393bc2193SAneesh V					controller register space
60493bc2193SAneesh V
6056705d81eSwdenk- Serial Ports:
60648d0192fSAndreas Engel		CONFIG_PL010_SERIAL
6076705d81eSwdenk
6086705d81eSwdenk		Define this if you want support for Amba PrimeCell PL010 UARTs.
6096705d81eSwdenk
61048d0192fSAndreas Engel		CONFIG_PL011_SERIAL
6116705d81eSwdenk
6126705d81eSwdenk		Define this if you want support for Amba PrimeCell PL011 UARTs.
6136705d81eSwdenk
6146705d81eSwdenk		CONFIG_PL011_CLOCK
6156705d81eSwdenk
6166705d81eSwdenk		If you have Amba PrimeCell PL011 UARTs, set this variable to
6176705d81eSwdenk		the clock speed of the UARTs.
6186705d81eSwdenk
6196705d81eSwdenk		CONFIG_PL01x_PORTS
6206705d81eSwdenk
6216705d81eSwdenk		If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
6226705d81eSwdenk		define this to a list of base addresses for each (supported)
6236705d81eSwdenk		port. See e.g. include/configs/versatile.h
6246705d81eSwdenk
625910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_RLCR
626910f1ae3SJohn Rigby
627910f1ae3SJohn Rigby		Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500)
628910f1ae3SJohn Rigby		have separate receive and transmit line control registers.  Set
629910f1ae3SJohn Rigby		this variable to initialize the extra register.
630910f1ae3SJohn Rigby
631910f1ae3SJohn Rigby		CONFIG_PL011_SERIAL_FLUSH_ON_INIT
632910f1ae3SJohn Rigby
633910f1ae3SJohn Rigby		On some platforms (e.g. U8500) U-Boot is loaded by a second stage
634910f1ae3SJohn Rigby		boot loader that has already initialized the UART.  Define this
635910f1ae3SJohn Rigby		variable to flush the UART at init time.
636910f1ae3SJohn Rigby
6376705d81eSwdenk
638c609719bSwdenk- Console Interface:
639c609719bSwdenk		Depending on board, define exactly one serial port
640c609719bSwdenk		(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
641c609719bSwdenk		CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
642c609719bSwdenk		console by defining CONFIG_8xx_CONS_NONE
643c609719bSwdenk
644c609719bSwdenk		Note: if CONFIG_8xx_CONS_NONE is defined, the serial
645c609719bSwdenk		port routines must be defined elsewhere
646c609719bSwdenk		(i.e. serial_init(), serial_getc(), ...)
647c609719bSwdenk
648c609719bSwdenk		CONFIG_CFB_CONSOLE
649c609719bSwdenk		Enables console device for a color framebuffer. Needs following
650c53043b7SWolfgang Denk		defines (cf. smiLynxEM, i8042)
651c609719bSwdenk			VIDEO_FB_LITTLE_ENDIAN	graphic memory organisation
652c609719bSwdenk						(default big endian)
653c609719bSwdenk			VIDEO_HW_RECTFILL	graphic chip supports
654c609719bSwdenk						rectangle fill
655c609719bSwdenk						(cf. smiLynxEM)
656c609719bSwdenk			VIDEO_HW_BITBLT		graphic chip supports
657c609719bSwdenk						bit-blit (cf. smiLynxEM)
658c609719bSwdenk			VIDEO_VISIBLE_COLS	visible pixel columns
659c609719bSwdenk						(cols=pitch)
660c609719bSwdenk			VIDEO_VISIBLE_ROWS	visible pixel rows
661c609719bSwdenk			VIDEO_PIXEL_SIZE	bytes per pixel
662c609719bSwdenk			VIDEO_DATA_FORMAT	graphic data format
663c609719bSwdenk						(0-5, cf. cfb_console.c)
664c609719bSwdenk			VIDEO_FB_ADRS		framebuffer address
665c609719bSwdenk			VIDEO_KBD_INIT_FCT	keyboard int fct
666c609719bSwdenk						(i.e. i8042_kbd_init())
667c609719bSwdenk			VIDEO_TSTC_FCT		test char fct
668c609719bSwdenk						(i.e. i8042_tstc)
669c609719bSwdenk			VIDEO_GETC_FCT		get char fct
670c609719bSwdenk						(i.e. i8042_getc)
671c609719bSwdenk			CONFIG_CONSOLE_CURSOR	cursor drawing on/off
672c609719bSwdenk						(requires blink timer
673c609719bSwdenk						cf. i8042.c)
6746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c)
675c609719bSwdenk			CONFIG_CONSOLE_TIME	display time/date info in
676c609719bSwdenk						upper right corner
677602ad3b3SJon Loeliger						(requires CONFIG_CMD_DATE)
678c609719bSwdenk			CONFIG_VIDEO_LOGO	display Linux logo in
679c609719bSwdenk						upper left corner
680a6c7ad2fSwdenk			CONFIG_VIDEO_BMP_LOGO	use bmp_logo.h instead of
681a6c7ad2fSwdenk						linux_logo.h for logo.
682a6c7ad2fSwdenk						Requires CONFIG_VIDEO_LOGO
683c609719bSwdenk			CONFIG_CONSOLE_EXTRA_INFO
68411ccc33fSMarcel Ziswiler						additional board info beside
685c609719bSwdenk						the logo
686c609719bSwdenk
68733a35bbbSPali Rohár		When CONFIG_CFB_CONSOLE_ANSI is defined, console will support
68833a35bbbSPali Rohár		a limited number of ANSI escape sequences (cursor control,
68933a35bbbSPali Rohár		erase functions and limited graphics rendition control).
69033a35bbbSPali Rohár
691c609719bSwdenk		When CONFIG_CFB_CONSOLE is defined, video console is
692c609719bSwdenk		default i/o. Serial console can be forced with
693c609719bSwdenk		environment 'console=serial'.
694c609719bSwdenk
695a3ad8e26Swdenk		When CONFIG_SILENT_CONSOLE is defined, all console
696a3ad8e26Swdenk		messages (by U-Boot and Linux!) can be silenced with
697a3ad8e26Swdenk		the "silent" environment variable. See
698a3ad8e26Swdenk		doc/README.silent for more information.
699a3ad8e26Swdenk
700c609719bSwdenk- Console Baudrate:
701c609719bSwdenk		CONFIG_BAUDRATE - in bps
702c609719bSwdenk		Select one of the baudrates listed in
7036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
7046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
705c609719bSwdenk
706c92fac91SHeiko Schocher- Console Rx buffer length
707c92fac91SHeiko Schocher		With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
708c92fac91SHeiko Schocher		the maximum receive buffer length for the SMC.
7092b3f12c2SHeiko Schocher		This option is actual only for 82xx and 8xx possible.
710c92fac91SHeiko Schocher		If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
711c92fac91SHeiko Schocher		must be defined, to setup the maximum idle timeout for
712c92fac91SHeiko Schocher		the SMC.
713c92fac91SHeiko Schocher
7149558b48aSGraeme Russ- Pre-Console Buffer:
7159558b48aSGraeme Russ		Prior to the console being initialised (i.e. serial UART
7169558b48aSGraeme Russ		initialised etc) all console output is silently discarded.
7179558b48aSGraeme Russ		Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to
7189558b48aSGraeme Russ		buffer any console messages prior to the console being
7199558b48aSGraeme Russ		initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ
7209558b48aSGraeme Russ		bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is
7219558b48aSGraeme Russ		a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ
7229558b48aSGraeme Russ		bytes are output before the console is initialised, the
7239558b48aSGraeme Russ		earlier bytes are discarded.
7249558b48aSGraeme Russ
7259558b48aSGraeme Russ		'Sane' compilers will generate smaller code if
7269558b48aSGraeme Russ		CONFIG_PRE_CON_BUF_SZ is a power of 2
7279558b48aSGraeme Russ
728046a37bdSSonny Rao- Safe printf() functions
729046a37bdSSonny Rao		Define CONFIG_SYS_VSNPRINTF to compile in safe versions of
730046a37bdSSonny Rao		the printf() functions. These are defined in
731046a37bdSSonny Rao		include/vsprintf.h and include snprintf(), vsnprintf() and
732046a37bdSSonny Rao		so on. Code size increase is approximately 300-500 bytes.
733046a37bdSSonny Rao		If this option is not given then these functions will
734046a37bdSSonny Rao		silently discard their buffer size argument - this means
735046a37bdSSonny Rao		you are not getting any overflow checking in this case.
736046a37bdSSonny Rao
737c609719bSwdenk- Boot Delay:	CONFIG_BOOTDELAY - in seconds
738c609719bSwdenk		Delay before automatically booting the default image;
739c609719bSwdenk		set to -1 to disable autoboot.
74093d7212fSJoe Hershberger		set to -2 to autoboot with no delay and not check for abort
74193d7212fSJoe Hershberger		(even when CONFIG_ZERO_BOOTDELAY_CHECK is defined).
742c609719bSwdenk
743c609719bSwdenk		See doc/README.autoboot for these options that
744c609719bSwdenk		work with CONFIG_BOOTDELAY. None are required.
745c609719bSwdenk		CONFIG_BOOT_RETRY_TIME
746c609719bSwdenk		CONFIG_BOOT_RETRY_MIN
747c609719bSwdenk		CONFIG_AUTOBOOT_KEYED
748c609719bSwdenk		CONFIG_AUTOBOOT_PROMPT
749c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR
750c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR
751c609719bSwdenk		CONFIG_AUTOBOOT_DELAY_STR2
752c609719bSwdenk		CONFIG_AUTOBOOT_STOP_STR2
753c609719bSwdenk		CONFIG_ZERO_BOOTDELAY_CHECK
754c609719bSwdenk		CONFIG_RESET_TO_RETRY
755c609719bSwdenk
756c609719bSwdenk- Autoboot Command:
757c609719bSwdenk		CONFIG_BOOTCOMMAND
758c609719bSwdenk		Only needed when CONFIG_BOOTDELAY is enabled;
759c609719bSwdenk		define a command string that is automatically executed
760c609719bSwdenk		when no character is read on the console interface
761c609719bSwdenk		within "Boot Delay" after reset.
762c609719bSwdenk
763c609719bSwdenk		CONFIG_BOOTARGS
764c609719bSwdenk		This can be used to pass arguments to the bootm
765c609719bSwdenk		command. The value of CONFIG_BOOTARGS goes into the
766c609719bSwdenk		environment value "bootargs".
767c609719bSwdenk
768c609719bSwdenk		CONFIG_RAMBOOT and CONFIG_NFSBOOT
769c609719bSwdenk		The value of these goes into the environment as
770c609719bSwdenk		"ramboot" and "nfsboot" respectively, and can be used
771c609719bSwdenk		as a convenience, when switching between booting from
77211ccc33fSMarcel Ziswiler		RAM and NFS.
773c609719bSwdenk
774c609719bSwdenk- Pre-Boot Commands:
775c609719bSwdenk		CONFIG_PREBOOT
776c609719bSwdenk
777c609719bSwdenk		When this option is #defined, the existence of the
778c609719bSwdenk		environment variable "preboot" will be checked
779c609719bSwdenk		immediately before starting the CONFIG_BOOTDELAY
780c609719bSwdenk		countdown and/or running the auto-boot command resp.
781c609719bSwdenk		entering interactive mode.
782c609719bSwdenk
783c609719bSwdenk		This feature is especially useful when "preboot" is
784c609719bSwdenk		automatically generated or modified. For an example
785c609719bSwdenk		see the LWMON board specific code: here "preboot" is
786c609719bSwdenk		modified when the user holds down a certain
787c609719bSwdenk		combination of keys on the (special) keyboard when
788c609719bSwdenk		booting the systems
789c609719bSwdenk
790c609719bSwdenk- Serial Download Echo Mode:
791c609719bSwdenk		CONFIG_LOADS_ECHO
792c609719bSwdenk		If defined to 1, all characters received during a
793c609719bSwdenk		serial download (using the "loads" command) are
794c609719bSwdenk		echoed back. This might be needed by some terminal
795c609719bSwdenk		emulations (like "cu"), but may as well just take
796c609719bSwdenk		time on others. This setting #define's the initial
797c609719bSwdenk		value of the "loads_echo" environment variable.
798c609719bSwdenk
799602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined)
800c609719bSwdenk		CONFIG_KGDB_BAUDRATE
801c609719bSwdenk		Select one of the baudrates listed in
8026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_BAUDRATE_TABLE, see below.
803c609719bSwdenk
804c609719bSwdenk- Monitor Functions:
805602ad3b3SJon Loeliger		Monitor commands can be included or excluded
806602ad3b3SJon Loeliger		from the build by using the #include files
807c6c621bdSStephen Warren		<config_cmd_all.h> and #undef'ing unwanted
808c6c621bdSStephen Warren		commands, or using <config_cmd_default.h>
809602ad3b3SJon Loeliger		and augmenting with additional #define's
810602ad3b3SJon Loeliger		for wanted commands.
811c609719bSwdenk
812602ad3b3SJon Loeliger		The default command configuration includes all commands
813602ad3b3SJon Loeliger		except those marked below with a "*".
814602ad3b3SJon Loeliger
815602ad3b3SJon Loeliger		CONFIG_CMD_ASKENV	* ask for env variable
816602ad3b3SJon Loeliger		CONFIG_CMD_BDI		  bdinfo
817602ad3b3SJon Loeliger		CONFIG_CMD_BEDBUG	* Include BedBug Debugger
818602ad3b3SJon Loeliger		CONFIG_CMD_BMP		* BMP support
819602ad3b3SJon Loeliger		CONFIG_CMD_BSP		* Board specific commands
820602ad3b3SJon Loeliger		CONFIG_CMD_BOOTD	  bootd
821602ad3b3SJon Loeliger		CONFIG_CMD_CACHE	* icache, dcache
822602ad3b3SJon Loeliger		CONFIG_CMD_CONSOLE	  coninfo
823710b9938SMike Frysinger		CONFIG_CMD_CRC32	* crc32
824602ad3b3SJon Loeliger		CONFIG_CMD_DATE		* support for RTC, date/time...
825602ad3b3SJon Loeliger		CONFIG_CMD_DHCP		* DHCP support
826602ad3b3SJon Loeliger		CONFIG_CMD_DIAG		* Diagnostics
827a7c93104SPeter Tyser		CONFIG_CMD_DS4510	* ds4510 I2C gpio commands
828a7c93104SPeter Tyser		CONFIG_CMD_DS4510_INFO	* ds4510 I2C info command
829a7c93104SPeter Tyser		CONFIG_CMD_DS4510_MEM	* ds4510 I2C eeprom/sram commansd
830a7c93104SPeter Tyser		CONFIG_CMD_DS4510_RST	* ds4510 I2C rst command
831602ad3b3SJon Loeliger		CONFIG_CMD_DTT		* Digital Therm and Thermostat
832602ad3b3SJon Loeliger		CONFIG_CMD_ECHO		  echo arguments
833246c6922SPeter Tyser		CONFIG_CMD_EDITENV	  edit env variable
834602ad3b3SJon Loeliger		CONFIG_CMD_EEPROM	* EEPROM read/write support
835602ad3b3SJon Loeliger		CONFIG_CMD_ELF		* bootelf, bootvx
8365e2b3e0cSJoe Hershberger		CONFIG_CMD_ENV_CALLBACK	* display details about env callbacks
837fffad71bSJoe Hershberger		CONFIG_CMD_ENV_FLAGS	* display details about env flags
8380c79cda0SMike Frysinger		CONFIG_CMD_EXPORTENV	* export the environment
83903e2ecf6SStephen Warren		CONFIG_CMD_EXT2		* ext2 command support
84003e2ecf6SStephen Warren		CONFIG_CMD_EXT4		* ext4 command support
841bdab39d3SMike Frysinger		CONFIG_CMD_SAVEENV	  saveenv
842602ad3b3SJon Loeliger		CONFIG_CMD_FDC		* Floppy Disk Support
84303e2ecf6SStephen Warren		CONFIG_CMD_FAT		* FAT command support
844602ad3b3SJon Loeliger		CONFIG_CMD_FDOS		* Dos diskette Support
845602ad3b3SJon Loeliger		CONFIG_CMD_FLASH	  flinfo, erase, protect
846602ad3b3SJon Loeliger		CONFIG_CMD_FPGA		  FPGA device initialization support
84753fdc7efSAnton Staaf		CONFIG_CMD_GETTIME	* Get time since boot
848a641b979SMike Frysinger		CONFIG_CMD_GO		* the 'go' command (exec code)
849a000b795SKim Phillips		CONFIG_CMD_GREPENV	* search environment
850bf36c5d5SSimon Glass		CONFIG_CMD_HASH		* calculate hash / digest
851602ad3b3SJon Loeliger		CONFIG_CMD_HWFLOW	* RTS/CTS hw flow control
852602ad3b3SJon Loeliger		CONFIG_CMD_I2C		* I2C serial bus support
853602ad3b3SJon Loeliger		CONFIG_CMD_IDE		* IDE harddisk support
854602ad3b3SJon Loeliger		CONFIG_CMD_IMI		  iminfo
8558fdf1e0fSVipin Kumar		CONFIG_CMD_IMLS		  List all images found in NOR flash
8568fdf1e0fSVipin Kumar		CONFIG_CMD_IMLS_NAND	  List all images found in NAND flash
857602ad3b3SJon Loeliger		CONFIG_CMD_IMMAP	* IMMR dump support
8580c79cda0SMike Frysinger		CONFIG_CMD_IMPORTENV	* import an environment
859c167cc02SJoe Hershberger		CONFIG_CMD_INI		* import data from an ini file into the env
860602ad3b3SJon Loeliger		CONFIG_CMD_IRQ		* irqinfo
861602ad3b3SJon Loeliger		CONFIG_CMD_ITEST	  Integer/string test of 2 values
862602ad3b3SJon Loeliger		CONFIG_CMD_JFFS2	* JFFS2 Support
863602ad3b3SJon Loeliger		CONFIG_CMD_KGDB		* kgdb
8641ba7fd25SMike Frysinger		CONFIG_CMD_LDRINFO	  ldrinfo (display Blackfin loader)
865d22c338eSJoe Hershberger		CONFIG_CMD_LINK_LOCAL	* link-local IP address auto-configuration
866d22c338eSJoe Hershberger					  (169.254.*.*)
867602ad3b3SJon Loeliger		CONFIG_CMD_LOADB	  loadb
868602ad3b3SJon Loeliger		CONFIG_CMD_LOADS	  loads
86902c9aa1dSRobin Getz		CONFIG_CMD_MD5SUM	  print md5 message digest
87002c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY and CONFIG_MD5)
87115a33e49SSimon Glass		CONFIG_CMD_MEMINFO	* Display detailed memory information
872602ad3b3SJon Loeliger		CONFIG_CMD_MEMORY	  md, mm, nm, mw, cp, cmp, crc, base,
873a2681707SWolfgang Denk					  loop, loopw
874a2681707SWolfgang Denk		CONFIG_CMD_MEMTEST	  mtest
875602ad3b3SJon Loeliger		CONFIG_CMD_MISC		  Misc functions like sleep etc
876602ad3b3SJon Loeliger		CONFIG_CMD_MMC		* MMC memory mapped support
877602ad3b3SJon Loeliger		CONFIG_CMD_MII		* MII utility commands
87868d7d651SStefan Roese		CONFIG_CMD_MTDPARTS	* MTD partition support
879602ad3b3SJon Loeliger		CONFIG_CMD_NAND		* NAND support
880602ad3b3SJon Loeliger		CONFIG_CMD_NET		  bootp, tftpboot, rarpboot
881e92739d3SPeter Tyser		CONFIG_CMD_PCA953X	* PCA953x I2C gpio commands
882e92739d3SPeter Tyser		CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command
883602ad3b3SJon Loeliger		CONFIG_CMD_PCI		* pciinfo
884602ad3b3SJon Loeliger		CONFIG_CMD_PCMCIA		* PCMCIA support
885602ad3b3SJon Loeliger		CONFIG_CMD_PING		* send ICMP ECHO_REQUEST to network
886602ad3b3SJon Loeliger					  host
887602ad3b3SJon Loeliger		CONFIG_CMD_PORTIO	* Port I/O
888ff048ea9SKenneth Waters		CONFIG_CMD_READ		* Read raw data from partition
889602ad3b3SJon Loeliger		CONFIG_CMD_REGINFO	* Register dump
890602ad3b3SJon Loeliger		CONFIG_CMD_RUN		  run command in env variable
891d304931fSSimon Glass		CONFIG_CMD_SANDBOX	* sb command to access sandbox features
892602ad3b3SJon Loeliger		CONFIG_CMD_SAVES	* save S record dump
893602ad3b3SJon Loeliger		CONFIG_CMD_SCSI		* SCSI Support
894602ad3b3SJon Loeliger		CONFIG_CMD_SDRAM	* print SDRAM configuration information
895602ad3b3SJon Loeliger					  (requires CONFIG_CMD_I2C)
896602ad3b3SJon Loeliger		CONFIG_CMD_SETGETDCR	  Support for DCR Register access
897602ad3b3SJon Loeliger					  (4xx only)
898f61ec45eSEric Nelson		CONFIG_CMD_SF		* Read/write/erase SPI NOR flash
899c6b1ee66SAlexander Holler		CONFIG_CMD_SHA1SUM	  print sha1 memory digest
90002c9aa1dSRobin Getz					  (requires CONFIG_CMD_MEMORY)
901*7d861d95SBob Liu		CONFIG_CMD_SOFTSWITCH	* Soft switch setting command for BF60x
90274de7aefSWolfgang Denk		CONFIG_CMD_SOURCE	  "source" command Support
903602ad3b3SJon Loeliger		CONFIG_CMD_SPI		* SPI serial bus support
9047a83af07SLuca Ceresoli		CONFIG_CMD_TFTPSRV	* TFTP transfer in server mode
9051fb7cd49SSimon Glass		CONFIG_CMD_TFTPPUT	* TFTP put command (upload)
906da83bcd7SJoe Hershberger		CONFIG_CMD_TIME		* run command and report execution time (ARM specific)
907da83bcd7SJoe Hershberger		CONFIG_CMD_TIMER	* access to the system tick timer
908602ad3b3SJon Loeliger		CONFIG_CMD_USB		* USB support
909602ad3b3SJon Loeliger		CONFIG_CMD_CDP		* Cisco Discover Protocol support
910c8339f51SMarek Vasut		CONFIG_CMD_MFSL		* Microblaze FSL support
911c609719bSwdenk
912c609719bSwdenk
913c609719bSwdenk		EXAMPLE: If you want all functions except of network
914c609719bSwdenk		support you can write:
915c609719bSwdenk
916602ad3b3SJon Loeliger		#include "config_cmd_all.h"
917602ad3b3SJon Loeliger		#undef CONFIG_CMD_NET
918c609719bSwdenk
919213bf8c8SGerald Van Baren	Other Commands:
920213bf8c8SGerald Van Baren		fdt (flattened device tree) command: CONFIG_OF_LIBFDT
921c609719bSwdenk
922c609719bSwdenk	Note:	Don't enable the "icache" and "dcache" commands
923602ad3b3SJon Loeliger		(configuration option CONFIG_CMD_CACHE) unless you know
924c609719bSwdenk		what you (and your U-Boot users) are doing. Data
925c609719bSwdenk		cache cannot be enabled on systems like the 8xx or
926c609719bSwdenk		8260 (where accesses to the IMMR region must be
927c609719bSwdenk		uncached), and it cannot be disabled on all other
928c609719bSwdenk		systems where we (mis-) use the data cache to hold an
929c609719bSwdenk		initial stack and some data.
930c609719bSwdenk
931c609719bSwdenk
932c609719bSwdenk		XXX - this list needs to get updated!
933c609719bSwdenk
934a5ecbe62SWolfgang Denk- Regular expression support:
935a5ecbe62SWolfgang Denk		CONFIG_REGEX
936a5ecbe62SWolfgang Denk                If this variable is defined, U-Boot is linked against
937a5ecbe62SWolfgang Denk                the SLRE (Super Light Regular Expression) library,
938a5ecbe62SWolfgang Denk                which adds regex support to some commands, as for
939a5ecbe62SWolfgang Denk                example "env grep" and "setexpr".
940a5ecbe62SWolfgang Denk
94145ba8077SSimon Glass- Device tree:
94245ba8077SSimon Glass		CONFIG_OF_CONTROL
94345ba8077SSimon Glass		If this variable is defined, U-Boot will use a device tree
94445ba8077SSimon Glass		to configure its devices, instead of relying on statically
94545ba8077SSimon Glass		compiled #defines in the board file. This option is
94645ba8077SSimon Glass		experimental and only available on a few boards. The device
94745ba8077SSimon Glass		tree is available in the global data as gd->fdt_blob.
94845ba8077SSimon Glass
9492c0f79e4SSimon Glass		U-Boot needs to get its device tree from somewhere. This can
9502c0f79e4SSimon Glass		be done using one of the two options below:
951bbb0b128SSimon Glass
952bbb0b128SSimon Glass		CONFIG_OF_EMBED
953bbb0b128SSimon Glass		If this variable is defined, U-Boot will embed a device tree
954bbb0b128SSimon Glass		binary in its image. This device tree file should be in the
955bbb0b128SSimon Glass		board directory and called <soc>-<board>.dts. The binary file
956bbb0b128SSimon Glass		is then picked up in board_init_f() and made available through
957bbb0b128SSimon Glass		the global data structure as gd->blob.
95845ba8077SSimon Glass
9592c0f79e4SSimon Glass		CONFIG_OF_SEPARATE
9602c0f79e4SSimon Glass		If this variable is defined, U-Boot will build a device tree
9612c0f79e4SSimon Glass		binary. It will be called u-boot.dtb. Architecture-specific
9622c0f79e4SSimon Glass		code will locate it at run-time. Generally this works by:
9632c0f79e4SSimon Glass
9642c0f79e4SSimon Glass			cat u-boot.bin u-boot.dtb >image.bin
9652c0f79e4SSimon Glass
9662c0f79e4SSimon Glass		and in fact, U-Boot does this for you, creating a file called
9672c0f79e4SSimon Glass		u-boot-dtb.bin which is useful in the common case. You can
9682c0f79e4SSimon Glass		still use the individual files if you need something more
9692c0f79e4SSimon Glass		exotic.
9702c0f79e4SSimon Glass
971c609719bSwdenk- Watchdog:
972c609719bSwdenk		CONFIG_WATCHDOG
973c609719bSwdenk		If this variable is defined, it enables watchdog
9746abe6fb6SDetlev Zundel		support for the SoC. There must be support in the SoC
9756abe6fb6SDetlev Zundel		specific code for a watchdog. For the 8xx and 8260
9766abe6fb6SDetlev Zundel		CPUs, the SIU Watchdog feature is enabled in the SYPCR
9776abe6fb6SDetlev Zundel		register.  When supported for a specific SoC is
9786abe6fb6SDetlev Zundel		available, then no further board specific code should
9796abe6fb6SDetlev Zundel		be needed to use it.
9806abe6fb6SDetlev Zundel
9816abe6fb6SDetlev Zundel		CONFIG_HW_WATCHDOG
9826abe6fb6SDetlev Zundel		When using a watchdog circuitry external to the used
9836abe6fb6SDetlev Zundel		SoC, then define this variable and provide board
9846abe6fb6SDetlev Zundel		specific code for the "hw_watchdog_reset" function.
985c609719bSwdenk
986c1551ea8Sstroese- U-Boot Version:
987c1551ea8Sstroese		CONFIG_VERSION_VARIABLE
988c1551ea8Sstroese		If this variable is defined, an environment variable
989c1551ea8Sstroese		named "ver" is created by U-Boot showing the U-Boot
990c1551ea8Sstroese		version as printed by the "version" command.
991a1ea8e51SBenoît Thébaudeau		Any change to this variable will be reverted at the
992a1ea8e51SBenoît Thébaudeau		next reset.
993c1551ea8Sstroese
994c609719bSwdenk- Real-Time Clock:
995c609719bSwdenk
996602ad3b3SJon Loeliger		When CONFIG_CMD_DATE is selected, the type of the RTC
997c609719bSwdenk		has to be selected, too. Define exactly one of the
998c609719bSwdenk		following options:
999c609719bSwdenk
1000c609719bSwdenk		CONFIG_RTC_MPC8xx	- use internal RTC of MPC8xx
1001c609719bSwdenk		CONFIG_RTC_PCF8563	- use Philips PCF8563 RTC
10024e8b7544SFabio Estevam		CONFIG_RTC_MC13XXX	- use MC13783 or MC13892 RTC
1003c609719bSwdenk		CONFIG_RTC_MC146818	- use MC146818 RTC
10041cb8e980Swdenk		CONFIG_RTC_DS1307	- use Maxim, Inc. DS1307 RTC
1005c609719bSwdenk		CONFIG_RTC_DS1337	- use Maxim, Inc. DS1337 RTC
10067f70e853Swdenk		CONFIG_RTC_DS1338	- use Maxim, Inc. DS1338 RTC
10073bac3513Swdenk		CONFIG_RTC_DS164x	- use Dallas DS164x RTC
10089536dfccSTor Krill		CONFIG_RTC_ISL1208	- use Intersil ISL1208 RTC
10094c0d4c3bSwdenk		CONFIG_RTC_MAX6900	- use Maxim, Inc. MAX6900 RTC
10106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_DS1337_NOOSC	- Turn off the OSC output for DS1337
101171d19f30SHeiko Schocher		CONFIG_SYS_RV3029_TCR	- enable trickle charger on
101271d19f30SHeiko Schocher					  RV3029 RTC.
1013c609719bSwdenk
1014b37c7e5eSwdenk		Note that if the RTC uses I2C, then the I2C interface
1015b37c7e5eSwdenk		must also be configured. See I2C Support, below.
1016b37c7e5eSwdenk
1017e92739d3SPeter Tyser- GPIO Support:
1018e92739d3SPeter Tyser		CONFIG_PCA953X		- use NXP's PCA953X series I2C GPIO
1019e92739d3SPeter Tyser		CONFIG_PCA953X_INFO	- enable pca953x info command
1020e92739d3SPeter Tyser
10215dec49caSChris Packham		The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
10225dec49caSChris Packham		chip-ngpio pairs that tell the PCA953X driver the number of
10235dec49caSChris Packham		pins supported by a particular chip.
10245dec49caSChris Packham
1025e92739d3SPeter Tyser		Note that if the GPIO device uses I2C, then the I2C interface
1026e92739d3SPeter Tyser		must also be configured. See I2C Support, below.
1027e92739d3SPeter Tyser
1028c609719bSwdenk- Timestamp Support:
1029c609719bSwdenk
1030c609719bSwdenk		When CONFIG_TIMESTAMP is selected, the timestamp
1031c609719bSwdenk		(date and time) of an image is printed by image
1032c609719bSwdenk		commands like bootm or iminfo. This option is
1033602ad3b3SJon Loeliger		automatically enabled when you select CONFIG_CMD_DATE .
1034c609719bSwdenk
1035923c46f9SKarl O. Pinc- Partition Labels (disklabels) Supported:
1036923c46f9SKarl O. Pinc		Zero or more of the following:
1037923c46f9SKarl O. Pinc		CONFIG_MAC_PARTITION   Apple's MacOS partition table.
1038923c46f9SKarl O. Pinc		CONFIG_DOS_PARTITION   MS Dos partition table, traditional on the
1039923c46f9SKarl O. Pinc				       Intel architecture, USB sticks, etc.
1040923c46f9SKarl O. Pinc		CONFIG_ISO_PARTITION   ISO partition table, used on CDROM etc.
1041923c46f9SKarl O. Pinc		CONFIG_EFI_PARTITION   GPT partition table, common when EFI is the
1042923c46f9SKarl O. Pinc				       bootloader.  Note 2TB partition limit; see
1043923c46f9SKarl O. Pinc				       disk/part_efi.c
1044923c46f9SKarl O. Pinc		CONFIG_MTD_PARTITIONS  Memory Technology Device partition table.
1045c609719bSwdenk
1046602ad3b3SJon Loeliger		If IDE or SCSI support is enabled (CONFIG_CMD_IDE or
1047218ca724SWolfgang Denk		CONFIG_CMD_SCSI) you must configure support for at
1048923c46f9SKarl O. Pinc		least one non-MTD partition type as well.
1049c609719bSwdenk
1050c609719bSwdenk- IDE Reset method:
10514d13cbadSwdenk		CONFIG_IDE_RESET_ROUTINE - this is defined in several
10524d13cbadSwdenk		board configurations files but used nowhere!
1053c609719bSwdenk
10544d13cbadSwdenk		CONFIG_IDE_RESET - is this is defined, IDE Reset will
10554d13cbadSwdenk		be performed by calling the function
10564d13cbadSwdenk			ide_set_reset(int reset)
10574d13cbadSwdenk		which has to be defined in a board specific file
1058c609719bSwdenk
1059c609719bSwdenk- ATAPI Support:
1060c609719bSwdenk		CONFIG_ATAPI
1061c609719bSwdenk
1062c609719bSwdenk		Set this to enable ATAPI support.
1063c609719bSwdenk
1064c40b2956Swdenk- LBA48 Support
1065c40b2956Swdenk		CONFIG_LBA48
1066c40b2956Swdenk
1067c40b2956Swdenk		Set this to enable support for disks larger than 137GB
10684b142febSHeiko Schocher		Also look at CONFIG_SYS_64BIT_LBA.
1069c40b2956Swdenk		Whithout these , LBA48 support uses 32bit variables and will 'only'
1070c40b2956Swdenk		support disks up to 2.1TB.
1071c40b2956Swdenk
10726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_64BIT_LBA:
1073c40b2956Swdenk			When enabled, makes the IDE subsystem use 64bit sector addresses.
1074c40b2956Swdenk			Default is 32bit.
1075c40b2956Swdenk
1076c609719bSwdenk- SCSI Support:
1077c609719bSwdenk		At the moment only there is only support for the
1078c609719bSwdenk		SYM53C8XX SCSI controller; define
1079c609719bSwdenk		CONFIG_SCSI_SYM53C8XX to enable it.
1080c609719bSwdenk
10816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and
10826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *
10836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the
1084c609719bSwdenk		maximum numbers of LUNs, SCSI ID's and target
1085c609719bSwdenk		devices.
10866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)
1087c609719bSwdenk
1088447c031bSStefan Reinauer                The environment variable 'scsidevs' is set to the number of
1089447c031bSStefan Reinauer                SCSI devices found during the last scan.
1090447c031bSStefan Reinauer
1091c609719bSwdenk- NETWORK Support (PCI):
1092682011ffSwdenk		CONFIG_E1000
1093ce5207e1SKyle Moffett		Support for Intel 8254x/8257x gigabit chips.
1094ce5207e1SKyle Moffett
1095ce5207e1SKyle Moffett		CONFIG_E1000_SPI
1096ce5207e1SKyle Moffett		Utility code for direct access to the SPI bus on Intel 8257x.
1097ce5207e1SKyle Moffett		This does not do anything useful unless you set at least one
1098ce5207e1SKyle Moffett		of CONFIG_CMD_E1000 or CONFIG_E1000_SPI_GENERIC.
1099ce5207e1SKyle Moffett
1100ce5207e1SKyle Moffett		CONFIG_E1000_SPI_GENERIC
1101ce5207e1SKyle Moffett		Allow generic access to the SPI bus on the Intel 8257x, for
1102ce5207e1SKyle Moffett		example with the "sspi" command.
1103ce5207e1SKyle Moffett
1104ce5207e1SKyle Moffett		CONFIG_CMD_E1000
1105ce5207e1SKyle Moffett		Management command for E1000 devices.  When used on devices
1106ce5207e1SKyle Moffett		with SPI support you can reprogram the EEPROM from U-Boot.
1107682011ffSwdenk
1108ac3315c2SAndre Schwarz		CONFIG_E1000_FALLBACK_MAC
110911ccc33fSMarcel Ziswiler		default MAC for empty EEPROM after production.
1110ac3315c2SAndre Schwarz
1111c609719bSwdenk		CONFIG_EEPRO100
1112c609719bSwdenk		Support for Intel 82557/82559/82559ER chips.
111311ccc33fSMarcel Ziswiler		Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
1114c609719bSwdenk		write routine for first time initialisation.
1115c609719bSwdenk
1116c609719bSwdenk		CONFIG_TULIP
1117c609719bSwdenk		Support for Digital 2114x chips.
1118c609719bSwdenk		Optional CONFIG_TULIP_SELECT_MEDIA for board specific
1119c609719bSwdenk		modem chip initialisation (KS8761/QS6611).
1120c609719bSwdenk
1121c609719bSwdenk		CONFIG_NATSEMI
1122c609719bSwdenk		Support for National dp83815 chips.
1123c609719bSwdenk
1124c609719bSwdenk		CONFIG_NS8382X
1125c609719bSwdenk		Support for National dp8382[01] gigabit chips.
1126c609719bSwdenk
112745219c46Swdenk- NETWORK Support (other):
112845219c46Swdenk
1129c041e9d2SJens Scharsig		CONFIG_DRIVER_AT91EMAC
1130c041e9d2SJens Scharsig		Support for AT91RM9200 EMAC.
1131c041e9d2SJens Scharsig
1132c041e9d2SJens Scharsig			CONFIG_RMII
1133c041e9d2SJens Scharsig			Define this to use reduced MII inteface
1134c041e9d2SJens Scharsig
1135c041e9d2SJens Scharsig			CONFIG_DRIVER_AT91EMAC_QUIET
1136c041e9d2SJens Scharsig			If this defined, the driver is quiet.
1137c041e9d2SJens Scharsig			The driver doen't show link status messages.
1138c041e9d2SJens Scharsig
1139efdd7319SRob Herring		CONFIG_CALXEDA_XGMAC
1140efdd7319SRob Herring		Support for the Calxeda XGMAC device
1141efdd7319SRob Herring
11423bb46d23SAshok		CONFIG_LAN91C96
114345219c46Swdenk		Support for SMSC's LAN91C96 chips.
114445219c46Swdenk
114545219c46Swdenk			CONFIG_LAN91C96_BASE
114645219c46Swdenk			Define this to hold the physical address
114745219c46Swdenk			of the LAN91C96's I/O space
114845219c46Swdenk
114945219c46Swdenk			CONFIG_LAN91C96_USE_32_BIT
115045219c46Swdenk			Define this to enable 32 bit addressing
115145219c46Swdenk
11523bb46d23SAshok		CONFIG_SMC91111
1153f39748aeSwdenk		Support for SMSC's LAN91C111 chip
1154f39748aeSwdenk
1155f39748aeSwdenk			CONFIG_SMC91111_BASE
1156f39748aeSwdenk			Define this to hold the physical address
1157f39748aeSwdenk			of the device (I/O space)
1158f39748aeSwdenk
1159f39748aeSwdenk			CONFIG_SMC_USE_32_BIT
1160f39748aeSwdenk			Define this if data bus is 32 bits
1161f39748aeSwdenk
1162f39748aeSwdenk			CONFIG_SMC_USE_IOFUNCS
1163f39748aeSwdenk			Define this to use i/o functions instead of macros
1164f39748aeSwdenk			(some hardware wont work with macros)
1165f39748aeSwdenk
1166dc02badaSHeiko Schocher		CONFIG_DRIVER_TI_EMAC
1167dc02badaSHeiko Schocher		Support for davinci emac
1168dc02badaSHeiko Schocher
1169dc02badaSHeiko Schocher			CONFIG_SYS_DAVINCI_EMAC_PHY_COUNT
1170dc02badaSHeiko Schocher			Define this if you have more then 3 PHYs.
1171dc02badaSHeiko Schocher
1172b3dbf4a5SMacpaul Lin		CONFIG_FTGMAC100
1173b3dbf4a5SMacpaul Lin		Support for Faraday's FTGMAC100 Gigabit SoC Ethernet
1174b3dbf4a5SMacpaul Lin
1175b3dbf4a5SMacpaul Lin			CONFIG_FTGMAC100_EGIGA
1176b3dbf4a5SMacpaul Lin			Define this to use GE link update with gigabit PHY.
1177b3dbf4a5SMacpaul Lin			Define this if FTGMAC100 is connected to gigabit PHY.
1178b3dbf4a5SMacpaul Lin			If your system has 10/100 PHY only, it might not occur
1179b3dbf4a5SMacpaul Lin			wrong behavior. Because PHY usually return timeout or
1180b3dbf4a5SMacpaul Lin			useless data when polling gigabit status and gigabit
1181b3dbf4a5SMacpaul Lin			control registers. This behavior won't affect the
1182b3dbf4a5SMacpaul Lin			correctnessof 10/100 link speed update.
1183b3dbf4a5SMacpaul Lin
1184c2fff331SMike Rapoport		CONFIG_SMC911X
1185557b377dSJens Gehrlein		Support for SMSC's LAN911x and LAN921x chips
1186557b377dSJens Gehrlein
1187c2fff331SMike Rapoport			CONFIG_SMC911X_BASE
1188557b377dSJens Gehrlein			Define this to hold the physical address
1189557b377dSJens Gehrlein			of the device (I/O space)
1190557b377dSJens Gehrlein
1191c2fff331SMike Rapoport			CONFIG_SMC911X_32_BIT
1192557b377dSJens Gehrlein			Define this if data bus is 32 bits
1193557b377dSJens Gehrlein
1194c2fff331SMike Rapoport			CONFIG_SMC911X_16_BIT
1195557b377dSJens Gehrlein			Define this if data bus is 16 bits. If your processor
1196557b377dSJens Gehrlein			automatically converts one 32 bit word to two 16 bit
1197c2fff331SMike Rapoport			words you may also try CONFIG_SMC911X_32_BIT.
1198557b377dSJens Gehrlein
11993d0075faSYoshihiro Shimoda		CONFIG_SH_ETHER
12003d0075faSYoshihiro Shimoda		Support for Renesas on-chip Ethernet controller
12013d0075faSYoshihiro Shimoda
12023d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_USE_PORT
12033d0075faSYoshihiro Shimoda			Define the number of ports to be used
12043d0075faSYoshihiro Shimoda
12053d0075faSYoshihiro Shimoda			CONFIG_SH_ETHER_PHY_ADDR
12063d0075faSYoshihiro Shimoda			Define the ETH PHY's address
12073d0075faSYoshihiro Shimoda
120868260aabSYoshihiro Shimoda			CONFIG_SH_ETHER_CACHE_WRITEBACK
120968260aabSYoshihiro Shimoda			If this option is set, the driver enables cache flush.
121068260aabSYoshihiro Shimoda
12115e124724SVadim Bendebury- TPM Support:
12125e124724SVadim Bendebury		CONFIG_GENERIC_LPC_TPM
12135e124724SVadim Bendebury		Support for generic parallel port TPM devices. Only one device
12145e124724SVadim Bendebury		per system is supported at this time.
12155e124724SVadim Bendebury
12165e124724SVadim Bendebury			CONFIG_TPM_TIS_BASE_ADDRESS
12175e124724SVadim Bendebury			Base address where the generic TPM device is mapped
12185e124724SVadim Bendebury			to. Contemporary x86 systems usually map it at
12195e124724SVadim Bendebury			0xfed40000.
12205e124724SVadim Bendebury
1221c609719bSwdenk- USB Support:
1222c609719bSwdenk		At the moment only the UHCI host controller is
12234d13cbadSwdenk		supported (PIP405, MIP405, MPC5200); define
1224c609719bSwdenk		CONFIG_USB_UHCI to enable it.
1225c609719bSwdenk		define CONFIG_USB_KEYBOARD to enable the USB Keyboard
122630d56faeSwdenk		and define CONFIG_USB_STORAGE to enable the USB
1227c609719bSwdenk		storage devices.
1228c609719bSwdenk		Note:
1229c609719bSwdenk		Supported are USB Keyboards and USB Floppy drives
1230c609719bSwdenk		(TEAC FD-05PUB).
12314d13cbadSwdenk		MPC5200 USB requires additional defines:
12324d13cbadSwdenk			CONFIG_USB_CLOCK
12334d13cbadSwdenk				for 528 MHz Clock: 0x0001bbbb
1234307ecb6dSEric Millbrandt			CONFIG_PSC3_USB
1235307ecb6dSEric Millbrandt				for USB on PSC3
12364d13cbadSwdenk			CONFIG_USB_CONFIG
12374d13cbadSwdenk				for differential drivers: 0x00001000
12384d13cbadSwdenk				for single ended drivers: 0x00005000
1239307ecb6dSEric Millbrandt				for differential drivers on PSC3: 0x00000100
1240307ecb6dSEric Millbrandt				for single ended drivers on PSC3: 0x00004100
12416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_USB_EVENT_POLL
1242fdcfaa1bSZhang Wei				May be defined to allow interrupt polling
1243fdcfaa1bSZhang Wei				instead of using asynchronous interrupts
12444d13cbadSwdenk
12459ab4ce22SSimon Glass		CONFIG_USB_EHCI_TXFIFO_THRESH enables setting of the
12469ab4ce22SSimon Glass		txfilltuning field in the EHCI controller on reset.
12479ab4ce22SSimon Glass
124816c8d5e7SWolfgang Denk- USB Device:
124916c8d5e7SWolfgang Denk		Define the below if you wish to use the USB console.
125016c8d5e7SWolfgang Denk		Once firmware is rebuilt from a serial console issue the
125116c8d5e7SWolfgang Denk		command "setenv stdin usbtty; setenv stdout usbtty" and
125211ccc33fSMarcel Ziswiler		attach your USB cable. The Unix command "dmesg" should print
125316c8d5e7SWolfgang Denk		it has found a new device. The environment variable usbtty
125416c8d5e7SWolfgang Denk		can be set to gserial or cdc_acm to enable your device to
125516c8d5e7SWolfgang Denk		appear to a USB host as a Linux gserial device or a
125616c8d5e7SWolfgang Denk		Common Device Class Abstract Control Model serial device.
125716c8d5e7SWolfgang Denk		If you select usbtty = gserial you should be able to enumerate
125816c8d5e7SWolfgang Denk		a Linux host by
125916c8d5e7SWolfgang Denk		# modprobe usbserial vendor=0xVendorID product=0xProductID
126016c8d5e7SWolfgang Denk		else if using cdc_acm, simply setting the environment
126116c8d5e7SWolfgang Denk		variable usbtty to be cdc_acm should suffice. The following
126216c8d5e7SWolfgang Denk		might be defined in YourBoardName.h
126316c8d5e7SWolfgang Denk
126416c8d5e7SWolfgang Denk			CONFIG_USB_DEVICE
126516c8d5e7SWolfgang Denk			Define this to build a UDC device
126616c8d5e7SWolfgang Denk
126716c8d5e7SWolfgang Denk			CONFIG_USB_TTY
126816c8d5e7SWolfgang Denk			Define this to have a tty type of device available to
126916c8d5e7SWolfgang Denk			talk to the UDC device
127016c8d5e7SWolfgang Denk
1271f9da0f89SVipin KUMAR			CONFIG_USBD_HS
1272f9da0f89SVipin KUMAR			Define this to enable the high speed support for usb
1273f9da0f89SVipin KUMAR			device and usbtty. If this feature is enabled, a routine
1274f9da0f89SVipin KUMAR			int is_usbd_high_speed(void)
1275f9da0f89SVipin KUMAR			also needs to be defined by the driver to dynamically poll
1276f9da0f89SVipin KUMAR			whether the enumeration has succeded at high speed or full
1277f9da0f89SVipin KUMAR			speed.
1278f9da0f89SVipin KUMAR
12796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			CONFIG_SYS_CONSOLE_IS_IN_ENV
128016c8d5e7SWolfgang Denk			Define this if you want stdin, stdout &/or stderr to
128116c8d5e7SWolfgang Denk			be set to usbtty.
128216c8d5e7SWolfgang Denk
128316c8d5e7SWolfgang Denk			mpc8xx:
12846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_EXTC_CLK 0xBLAH
128516c8d5e7SWolfgang Denk				Derive USB clock from external clock "blah"
12866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_EXTC_CLK 0x02
128716c8d5e7SWolfgang Denk
12886d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				CONFIG_SYS_USB_BRG_CLK 0xBLAH
128916c8d5e7SWolfgang Denk				Derive USB clock from brgclk
12906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD				- CONFIG_SYS_USB_BRG_CLK 0x04
129116c8d5e7SWolfgang Denk
129216c8d5e7SWolfgang Denk		If you have a USB-IF assigned VendorID then you may wish to
129316c8d5e7SWolfgang Denk		define your own vendor specific values either in BoardName.h
129416c8d5e7SWolfgang Denk		or directly in usbd_vendor_info.h. If you don't define
129516c8d5e7SWolfgang Denk		CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME,
129616c8d5e7SWolfgang Denk		CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot
129716c8d5e7SWolfgang Denk		should pretend to be a Linux device to it's target host.
129816c8d5e7SWolfgang Denk
129916c8d5e7SWolfgang Denk			CONFIG_USBD_MANUFACTURER
130016c8d5e7SWolfgang Denk			Define this string as the name of your company for
130116c8d5e7SWolfgang Denk			- CONFIG_USBD_MANUFACTURER "my company"
130216c8d5e7SWolfgang Denk
130316c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCT_NAME
130416c8d5e7SWolfgang Denk			Define this string as the name of your product
130516c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
130616c8d5e7SWolfgang Denk
130716c8d5e7SWolfgang Denk			CONFIG_USBD_VENDORID
130816c8d5e7SWolfgang Denk			Define this as your assigned Vendor ID from the USB
130916c8d5e7SWolfgang Denk			Implementors Forum. This *must* be a genuine Vendor ID
131016c8d5e7SWolfgang Denk			to avoid polluting the USB namespace.
131116c8d5e7SWolfgang Denk			- CONFIG_USBD_VENDORID 0xFFFF
131216c8d5e7SWolfgang Denk
131316c8d5e7SWolfgang Denk			CONFIG_USBD_PRODUCTID
131416c8d5e7SWolfgang Denk			Define this as the unique Product ID
131516c8d5e7SWolfgang Denk			for your device
131616c8d5e7SWolfgang Denk			- CONFIG_USBD_PRODUCTID 0xFFFF
1317c609719bSwdenk
1318d70a560fSIgor Grinberg- ULPI Layer Support:
1319d70a560fSIgor Grinberg		The ULPI (UTMI Low Pin (count) Interface) PHYs are supported via
1320d70a560fSIgor Grinberg		the generic ULPI layer. The generic layer accesses the ULPI PHY
1321d70a560fSIgor Grinberg		via the platform viewport, so you need both the genric layer and
1322d70a560fSIgor Grinberg		the viewport enabled. Currently only Chipidea/ARC based
1323d70a560fSIgor Grinberg		viewport is supported.
1324d70a560fSIgor Grinberg		To enable the ULPI layer support, define CONFIG_USB_ULPI and
1325d70a560fSIgor Grinberg		CONFIG_USB_ULPI_VIEWPORT in your board configuration file.
13266d365ea0SLucas Stach		If your ULPI phy needs a different reference clock than the
13276d365ea0SLucas Stach		standard 24 MHz then you have to define CONFIG_ULPI_REF_CLK to
13286d365ea0SLucas Stach		the appropriate value in Hz.
1329c609719bSwdenk
1330c609719bSwdenk- MMC Support:
1331c609719bSwdenk		The MMC controller on the Intel PXA is supported. To
1332c609719bSwdenk		enable this define CONFIG_MMC. The MMC can be
1333c609719bSwdenk		accessed from the boot prompt by mapping the device
1334c609719bSwdenk		to physical memory similar to flash. Command line is
1335602ad3b3SJon Loeliger		enabled with CONFIG_CMD_MMC. The MMC driver also works with
1336602ad3b3SJon Loeliger		the FAT fs. This is enabled with CONFIG_CMD_FAT.
1337c609719bSwdenk
1338afb35666SYoshihiro Shimoda		CONFIG_SH_MMCIF
1339afb35666SYoshihiro Shimoda		Support for Renesas on-chip MMCIF controller
1340afb35666SYoshihiro Shimoda
1341afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_ADDR
1342afb35666SYoshihiro Shimoda			Define the base address of MMCIF registers
1343afb35666SYoshihiro Shimoda
1344afb35666SYoshihiro Shimoda			CONFIG_SH_MMCIF_CLK
1345afb35666SYoshihiro Shimoda			Define the clock frequency for MMCIF
1346afb35666SYoshihiro Shimoda
1347b3ba6e94STom Rini- USB Device Firmware Update (DFU) class support:
1348b3ba6e94STom Rini		CONFIG_DFU_FUNCTION
1349b3ba6e94STom Rini		This enables the USB portion of the DFU USB class
1350b3ba6e94STom Rini
1351b3ba6e94STom Rini		CONFIG_CMD_DFU
1352b3ba6e94STom Rini		This enables the command "dfu" which is used to have
1353b3ba6e94STom Rini		U-Boot create a DFU class device via USB.  This command
1354b3ba6e94STom Rini		requires that the "dfu_alt_info" environment variable be
1355b3ba6e94STom Rini		set and define the alt settings to expose to the host.
1356b3ba6e94STom Rini
1357b3ba6e94STom Rini		CONFIG_DFU_MMC
1358b3ba6e94STom Rini		This enables support for exposing (e)MMC devices via DFU.
1359b3ba6e94STom Rini
1360c6631764SPantelis Antoniou		CONFIG_DFU_NAND
1361c6631764SPantelis Antoniou		This enables support for exposing NAND devices via DFU.
1362c6631764SPantelis Antoniou
1363ea2453d5SPantelis Antoniou		CONFIG_SYS_DFU_MAX_FILE_SIZE
1364ea2453d5SPantelis Antoniou		When updating files rather than the raw storage device,
1365ea2453d5SPantelis Antoniou		we use a static buffer to copy the file into and then write
1366ea2453d5SPantelis Antoniou		the buffer once we've been given the whole file.  Define
1367ea2453d5SPantelis Antoniou		this to the maximum filesize (in bytes) for the buffer.
1368ea2453d5SPantelis Antoniou		Default is 4 MiB if undefined.
1369ea2453d5SPantelis Antoniou
13706705d81eSwdenk- Journaling Flash filesystem support:
13716705d81eSwdenk		CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE,
13726705d81eSwdenk		CONFIG_JFFS2_NAND_DEV
13736705d81eSwdenk		Define these for a default partition on a NAND device
13746705d81eSwdenk
13756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_SECTOR,
13766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS
13776705d81eSwdenk		Define these for a default partition on a NOR device
13786705d81eSwdenk
13796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_JFFS_CUSTOM_PART
13806705d81eSwdenk		Define this to create an own partition. You have to provide a
13816705d81eSwdenk		function struct part_info* jffs2_part_info(int part_num)
13826705d81eSwdenk
13836705d81eSwdenk		If you define only one JFFS2 partition you may also want to
13846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_JFFS_SINGLE_PART	1
13856705d81eSwdenk		to disable the command chpart. This is the default when you
13866705d81eSwdenk		have not defined a custom partition
13876705d81eSwdenk
1388c30a15e5SDonggeun Kim- FAT(File Allocation Table) filesystem write function support:
1389c30a15e5SDonggeun Kim		CONFIG_FAT_WRITE
1390656f4c65SDonggeun Kim
1391656f4c65SDonggeun Kim		Define this to enable support for saving memory data as a
1392656f4c65SDonggeun Kim		file in FAT formatted partition.
1393656f4c65SDonggeun Kim
1394656f4c65SDonggeun Kim		This will also enable the command "fatwrite" enabling the
1395656f4c65SDonggeun Kim		user to write files to FAT.
1396c30a15e5SDonggeun Kim
139784cd9327SGabe BlackCBFS (Coreboot Filesystem) support
139884cd9327SGabe Black		CONFIG_CMD_CBFS
139984cd9327SGabe Black
140084cd9327SGabe Black		Define this to enable support for reading from a Coreboot
140184cd9327SGabe Black		filesystem. Available commands are cbfsinit, cbfsinfo, cbfsls
140284cd9327SGabe Black		and cbfsload.
140384cd9327SGabe Black
1404c609719bSwdenk- Keyboard Support:
1405c609719bSwdenk		CONFIG_ISA_KEYBOARD
1406c609719bSwdenk
1407c609719bSwdenk		Define this to enable standard (PC-Style) keyboard
1408c609719bSwdenk		support
1409c609719bSwdenk
1410c609719bSwdenk		CONFIG_I8042_KBD
1411c609719bSwdenk		Standard PC keyboard driver with US (is default) and
1412c609719bSwdenk		GERMAN key layout (switch via environment 'keymap=de') support.
1413c609719bSwdenk		Export function i8042_kbd_init, i8042_tstc and i8042_getc
1414c609719bSwdenk		for cfb_console. Supports cursor blinking.
1415c609719bSwdenk
1416c609719bSwdenk- Video support:
1417c609719bSwdenk		CONFIG_VIDEO
1418c609719bSwdenk
1419c609719bSwdenk		Define this to enable video support (for output to
1420c609719bSwdenk		video).
1421c609719bSwdenk
1422c609719bSwdenk		CONFIG_VIDEO_CT69000
1423c609719bSwdenk
1424c609719bSwdenk		Enable Chips & Technologies 69000 Video chip
1425c609719bSwdenk
1426c609719bSwdenk		CONFIG_VIDEO_SMI_LYNXEM
1427eeb1b77bSwdenk		Enable Silicon Motion SMI 712/710/810 Video chip. The
1428eeb1b77bSwdenk		video output is selected via environment 'videoout'
1429eeb1b77bSwdenk		(1 = LCD and 2 = CRT). If videoout is undefined, CRT is
1430eeb1b77bSwdenk		assumed.
1431c609719bSwdenk
1432eeb1b77bSwdenk		For the CT69000 and SMI_LYNXEM drivers, videomode is
143311ccc33fSMarcel Ziswiler		selected via environment 'videomode'. Two different ways
1434eeb1b77bSwdenk		are possible:
1435eeb1b77bSwdenk		- "videomode=num"   'num' is a standard LiLo mode numbers.
1436eeb1b77bSwdenk		Following standard modes are supported	(* is default):
1437eeb1b77bSwdenk
1438eeb1b77bSwdenk		      Colors	640x480 800x600 1024x768 1152x864 1280x1024
1439eeb1b77bSwdenk		-------------+---------------------------------------------
1440eeb1b77bSwdenk		      8 bits |	0x301*	0x303	 0x305	  0x161	    0x307
1441eeb1b77bSwdenk		     15 bits |	0x310	0x313	 0x316	  0x162	    0x319
1442eeb1b77bSwdenk		     16 bits |	0x311	0x314	 0x317	  0x163	    0x31A
1443eeb1b77bSwdenk		     24 bits |	0x312	0x315	 0x318	    ?	    0x31B
1444eeb1b77bSwdenk		-------------+---------------------------------------------
1445c609719bSwdenk		(i.e. setenv videomode 317; saveenv; reset;)
1446c609719bSwdenk
1447eeb1b77bSwdenk		- "videomode=bootargs" all the video parameters are parsed
14487817cb20SMarcel Ziswiler		from the bootargs. (See drivers/video/videomodes.c)
1449eeb1b77bSwdenk
1450eeb1b77bSwdenk
1451a6c7ad2fSwdenk		CONFIG_VIDEO_SED13806
1452a6c7ad2fSwdenk		Enable Epson SED13806 driver. This driver supports 8bpp
1453a6c7ad2fSwdenk		and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP
1454a6c7ad2fSwdenk		or CONFIG_VIDEO_SED13806_16BPP
1455a6c7ad2fSwdenk
14567d3053fbSTimur Tabi		CONFIG_FSL_DIU_FB
14577d3053fbSTimur Tabi		Enable the Freescale DIU video driver.	Reference boards for
14587d3053fbSTimur Tabi		SOCs that have a DIU should define this macro to enable DIU
14597d3053fbSTimur Tabi		support, and should also define these other macros:
14607d3053fbSTimur Tabi
14617d3053fbSTimur Tabi			CONFIG_SYS_DIU_ADDR
14627d3053fbSTimur Tabi			CONFIG_VIDEO
14637d3053fbSTimur Tabi			CONFIG_CMD_BMP
14647d3053fbSTimur Tabi			CONFIG_CFB_CONSOLE
14657d3053fbSTimur Tabi			CONFIG_VIDEO_SW_CURSOR
14667d3053fbSTimur Tabi			CONFIG_VGA_AS_SINGLE_DEVICE
14677d3053fbSTimur Tabi			CONFIG_VIDEO_LOGO
14687d3053fbSTimur Tabi			CONFIG_VIDEO_BMP_LOGO
14697d3053fbSTimur Tabi
1470ba8e76bdSTimur Tabi		The DIU driver will look for the 'video-mode' environment
1471ba8e76bdSTimur Tabi		variable, and if defined, enable the DIU as a console during
1472ba8e76bdSTimur Tabi		boot.  See the documentation file README.video for a
1473ba8e76bdSTimur Tabi		description of this variable.
14747d3053fbSTimur Tabi
1475058d59b0SSimon Glass		CONFIG_VIDEO_VGA
1476058d59b0SSimon Glass
1477058d59b0SSimon Glass		Enable the VGA video / BIOS for x86. The alternative if you
1478058d59b0SSimon Glass		are using coreboot is to use the coreboot frame buffer
1479058d59b0SSimon Glass		driver.
1480058d59b0SSimon Glass
1481058d59b0SSimon Glass
1482682011ffSwdenk- Keyboard Support:
1483682011ffSwdenk		CONFIG_KEYBOARD
1484682011ffSwdenk
1485682011ffSwdenk		Define this to enable a custom keyboard support.
1486682011ffSwdenk		This simply calls drv_keyboard_init() which must be
1487682011ffSwdenk		defined in your board-specific files.
1488682011ffSwdenk		The only board using this so far is RBC823.
1489a6c7ad2fSwdenk
1490c609719bSwdenk- LCD Support:	CONFIG_LCD
1491c609719bSwdenk
1492c609719bSwdenk		Define this to enable LCD support (for output to LCD
1493c609719bSwdenk		display); also select one of the supported displays
1494c609719bSwdenk		by defining one of these:
1495c609719bSwdenk
149639cf4804SStelian Pop		CONFIG_ATMEL_LCD:
149739cf4804SStelian Pop
149839cf4804SStelian Pop			HITACHI TX09D70VM1CCA, 3.5", 240x320.
149939cf4804SStelian Pop
1500fd3103bbSwdenk		CONFIG_NEC_NL6448AC33:
1501c609719bSwdenk
1502fd3103bbSwdenk			NEC NL6448AC33-18. Active, color, single scan.
1503c609719bSwdenk
1504fd3103bbSwdenk		CONFIG_NEC_NL6448BC20
1505c609719bSwdenk
1506fd3103bbSwdenk			NEC NL6448BC20-08. 6.5", 640x480.
1507fd3103bbSwdenk			Active, color, single scan.
1508fd3103bbSwdenk
1509fd3103bbSwdenk		CONFIG_NEC_NL6448BC33_54
1510fd3103bbSwdenk
1511fd3103bbSwdenk			NEC NL6448BC33-54. 10.4", 640x480.
1512c609719bSwdenk			Active, color, single scan.
1513c609719bSwdenk
1514c609719bSwdenk		CONFIG_SHARP_16x9
1515c609719bSwdenk
1516c609719bSwdenk			Sharp 320x240. Active, color, single scan.
1517c609719bSwdenk			It isn't 16x9, and I am not sure what it is.
1518c609719bSwdenk
1519c609719bSwdenk		CONFIG_SHARP_LQ64D341
1520c609719bSwdenk
1521c609719bSwdenk			Sharp LQ64D341 display, 640x480.
1522c609719bSwdenk			Active, color, single scan.
1523c609719bSwdenk
1524c609719bSwdenk		CONFIG_HLD1045
1525c609719bSwdenk
1526c609719bSwdenk			HLD1045 display, 640x480.
1527c609719bSwdenk			Active, color, single scan.
1528c609719bSwdenk
1529c609719bSwdenk		CONFIG_OPTREX_BW
1530c609719bSwdenk
1531c609719bSwdenk			Optrex	 CBL50840-2 NF-FW 99 22 M5
1532c609719bSwdenk			or
1533c609719bSwdenk			Hitachi	 LMG6912RPFC-00T
1534c609719bSwdenk			or
1535c609719bSwdenk			Hitachi	 SP14Q002
1536c609719bSwdenk
1537c609719bSwdenk			320x240. Black & white.
1538c609719bSwdenk
1539c609719bSwdenk		Normally display is black on white background; define
15406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_WHITE_ON_BLACK to get it inverted.
1541c609719bSwdenk
1542676d319eSSimon Glass		CONFIG_LCD_ALIGNMENT
1543676d319eSSimon Glass
1544676d319eSSimon Glass		Normally the LCD is page-aligned (tyically 4KB). If this is
1545676d319eSSimon Glass		defined then the LCD will be aligned to this value instead.
1546676d319eSSimon Glass		For ARM it is sometimes useful to use MMU_SECTION_SIZE
1547676d319eSSimon Glass		here, since it is cheaper to change data cache settings on
1548676d319eSSimon Glass		a per-section basis.
1549676d319eSSimon Glass
15500d89efefSSimon Glass		CONFIG_CONSOLE_SCROLL_LINES
15510d89efefSSimon Glass
15520d89efefSSimon Glass		When the console need to be scrolled, this is the number of
15530d89efefSSimon Glass		lines to scroll by. It defaults to 1. Increasing this makes
15540d89efefSSimon Glass		the console jump but can help speed up operation when scrolling
15550d89efefSSimon Glass		is slow.
1556676d319eSSimon Glass
155745d7f525STom Wai-Hong Tam		CONFIG_LCD_BMP_RLE8
155845d7f525STom Wai-Hong Tam
155945d7f525STom Wai-Hong Tam		Support drawing of RLE8-compressed bitmaps on the LCD.
156045d7f525STom Wai-Hong Tam
1561735987c5STom Wai-Hong Tam		CONFIG_I2C_EDID
1562735987c5STom Wai-Hong Tam
1563735987c5STom Wai-Hong Tam		Enables an 'i2c edid' command which can read EDID
1564735987c5STom Wai-Hong Tam		information over I2C from an attached LCD display.
1565735987c5STom Wai-Hong Tam
15667152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN
1567d791b1dcSwdenk
1568d791b1dcSwdenk		If this option is set, the environment is checked for
1569d791b1dcSwdenk		a variable "splashimage". If found, the usual display
1570d791b1dcSwdenk		of logo, copyright and system information on the LCD
1571e94d2cd9Swdenk		is suppressed and the BMP image at the address
1572d791b1dcSwdenk		specified in "splashimage" is loaded instead. The
1573d791b1dcSwdenk		console is redirected to the "nulldev", too. This
1574d791b1dcSwdenk		allows for a "silent" boot where a splash screen is
1575d791b1dcSwdenk		loaded very quickly after power-on.
1576d791b1dcSwdenk
1577c0880485SNikita Kiryanov		CONFIG_SPLASHIMAGE_GUARD
1578c0880485SNikita Kiryanov
1579c0880485SNikita Kiryanov		If this option is set, then U-Boot will prevent the environment
1580c0880485SNikita Kiryanov		variable "splashimage" from being set to a problematic address
1581c0880485SNikita Kiryanov		(see README.displaying-bmps and README.arm-unaligned-accesses).
1582c0880485SNikita Kiryanov		This option is useful for targets where, due to alignment
1583c0880485SNikita Kiryanov		restrictions, an improperly aligned BMP image will cause a data
1584c0880485SNikita Kiryanov		abort. If you think you will not have problems with unaligned
1585c0880485SNikita Kiryanov		accesses (for example because your toolchain prevents them)
1586c0880485SNikita Kiryanov		there is no need to set this option.
1587c0880485SNikita Kiryanov
15881ca298ceSMatthias Weisser		CONFIG_SPLASH_SCREEN_ALIGN
15891ca298ceSMatthias Weisser
15901ca298ceSMatthias Weisser		If this option is set the splash image can be freely positioned
15911ca298ceSMatthias Weisser		on the screen. Environment variable "splashpos" specifies the
15921ca298ceSMatthias Weisser		position as "x,y". If a positive number is given it is used as
15931ca298ceSMatthias Weisser		number of pixel from left/top. If a negative number is given it
15941ca298ceSMatthias Weisser		is used as number of pixel from right/bottom. You can also
15951ca298ceSMatthias Weisser		specify 'm' for centering the image.
15961ca298ceSMatthias Weisser
15971ca298ceSMatthias Weisser		Example:
15981ca298ceSMatthias Weisser		setenv splashpos m,m
15991ca298ceSMatthias Weisser			=> image at center of screen
16001ca298ceSMatthias Weisser
16011ca298ceSMatthias Weisser		setenv splashpos 30,20
16021ca298ceSMatthias Weisser			=> image at x = 30 and y = 20
16031ca298ceSMatthias Weisser
16041ca298ceSMatthias Weisser		setenv splashpos -10,m
16051ca298ceSMatthias Weisser			=> vertically centered image
16061ca298ceSMatthias Weisser			   at x = dspWidth - bmpWidth - 9
16071ca298ceSMatthias Weisser
1608581bb419SNikita Kiryanov		CONFIG_SPLASH_SCREEN_PREPARE
1609581bb419SNikita Kiryanov
1610581bb419SNikita Kiryanov		If this option is set then the board_splash_screen_prepare()
1611581bb419SNikita Kiryanov		function, which must be defined in your code, is called as part
1612581bb419SNikita Kiryanov		of the splash screen display sequence. It gives the board an
1613581bb419SNikita Kiryanov		opportunity to prepare the splash image data before it is
1614581bb419SNikita Kiryanov		processed and sent to the frame buffer by U-Boot.
1615581bb419SNikita Kiryanov
161698f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP
161798f4a3dfSStefan Roese
161898f4a3dfSStefan Roese		If this option is set, additionally to standard BMP
161998f4a3dfSStefan Roese		images, gzipped BMP images can be displayed via the
162098f4a3dfSStefan Roese		splashscreen support or the bmp command.
162198f4a3dfSStefan Roese
1622d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8
1623d5011762SAnatolij Gustschin
1624d5011762SAnatolij Gustschin		If this option is set, 8-bit RLE compressed BMP images
1625d5011762SAnatolij Gustschin		can be displayed via the splashscreen support or the
1626d5011762SAnatolij Gustschin		bmp command.
1627d5011762SAnatolij Gustschin
1628f2b96dfbSLei Wen- Do compresssing for memory range:
1629f2b96dfbSLei Wen		CONFIG_CMD_ZIP
1630f2b96dfbSLei Wen
1631f2b96dfbSLei Wen		If this option is set, it would use zlib deflate method
1632f2b96dfbSLei Wen		to compress the specified memory at its best effort.
1633f2b96dfbSLei Wen
1634c29fdfc1Swdenk- Compression support:
1635c29fdfc1Swdenk		CONFIG_BZIP2
1636c29fdfc1Swdenk
1637c29fdfc1Swdenk		If this option is set, support for bzip2 compressed
1638c29fdfc1Swdenk		images is included. If not, only uncompressed and gzip
1639c29fdfc1Swdenk		compressed images are supported.
1640c29fdfc1Swdenk
1641c29fdfc1Swdenk		NOTE: the bzip2 algorithm requires a lot of RAM, so
16426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
1643c29fdfc1Swdenk		be at least 4MB.
1644d791b1dcSwdenk
1645fc9c1727SLuigi 'Comio' Mantellini		CONFIG_LZMA
1646fc9c1727SLuigi 'Comio' Mantellini
1647fc9c1727SLuigi 'Comio' Mantellini		If this option is set, support for lzma compressed
1648fc9c1727SLuigi 'Comio' Mantellini		images is included.
1649fc9c1727SLuigi 'Comio' Mantellini
1650fc9c1727SLuigi 'Comio' Mantellini		Note: The LZMA algorithm adds between 2 and 4KB of code and it
1651fc9c1727SLuigi 'Comio' Mantellini		requires an amount of dynamic memory that is given by the
1652fc9c1727SLuigi 'Comio' Mantellini		formula:
1653fc9c1727SLuigi 'Comio' Mantellini
1654fc9c1727SLuigi 'Comio' Mantellini			(1846 + 768 << (lc + lp)) * sizeof(uint16)
1655fc9c1727SLuigi 'Comio' Mantellini
1656fc9c1727SLuigi 'Comio' Mantellini		Where lc and lp stand for, respectively, Literal context bits
1657fc9c1727SLuigi 'Comio' Mantellini		and Literal pos bits.
1658fc9c1727SLuigi 'Comio' Mantellini
1659fc9c1727SLuigi 'Comio' Mantellini		This value is upper-bounded by 14MB in the worst case. Anyway,
1660fc9c1727SLuigi 'Comio' Mantellini		for a ~4MB large kernel image, we have lc=3 and lp=0 for a
1661fc9c1727SLuigi 'Comio' Mantellini		total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is
1662fc9c1727SLuigi 'Comio' Mantellini		a very small buffer.
1663fc9c1727SLuigi 'Comio' Mantellini
1664fc9c1727SLuigi 'Comio' Mantellini		Use the lzmainfo tool to determinate the lc and lp values and
1665fc9c1727SLuigi 'Comio' Mantellini		then calculate the amount of needed dynamic memory (ensuring
16666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		the appropriate CONFIG_SYS_MALLOC_LEN value).
1667fc9c1727SLuigi 'Comio' Mantellini
166817ea1177Swdenk- MII/PHY support:
166917ea1177Swdenk		CONFIG_PHY_ADDR
167017ea1177Swdenk
167117ea1177Swdenk		The address of PHY on MII bus.
167217ea1177Swdenk
167317ea1177Swdenk		CONFIG_PHY_CLOCK_FREQ (ppc4xx)
167417ea1177Swdenk
167517ea1177Swdenk		The clock frequency of the MII bus
167617ea1177Swdenk
167717ea1177Swdenk		CONFIG_PHY_GIGE
167817ea1177Swdenk
167917ea1177Swdenk		If this option is set, support for speed/duplex
168011ccc33fSMarcel Ziswiler		detection of gigabit PHY is included.
168117ea1177Swdenk
168217ea1177Swdenk		CONFIG_PHY_RESET_DELAY
168317ea1177Swdenk
168417ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
168517ea1177Swdenk		reset before any MII register access is possible.
168617ea1177Swdenk		For such PHY, set this option to the usec delay
168717ea1177Swdenk		required. (minimum 300usec for LXT971A)
168817ea1177Swdenk
168917ea1177Swdenk		CONFIG_PHY_CMD_DELAY (ppc4xx)
169017ea1177Swdenk
169117ea1177Swdenk		Some PHY like Intel LXT971A need extra delay after
169217ea1177Swdenk		command issued before MII status register can be read
169317ea1177Swdenk
1694c609719bSwdenk- Ethernet address:
1695c609719bSwdenk		CONFIG_ETHADDR
1696c68a05feSrichardretanubun		CONFIG_ETH1ADDR
1697c609719bSwdenk		CONFIG_ETH2ADDR
1698c609719bSwdenk		CONFIG_ETH3ADDR
1699c68a05feSrichardretanubun		CONFIG_ETH4ADDR
1700c68a05feSrichardretanubun		CONFIG_ETH5ADDR
1701c609719bSwdenk
170211ccc33fSMarcel Ziswiler		Define a default value for Ethernet address to use
170311ccc33fSMarcel Ziswiler		for the respective Ethernet interface, in case this
1704c609719bSwdenk		is not determined automatically.
1705c609719bSwdenk
1706c609719bSwdenk- IP address:
1707c609719bSwdenk		CONFIG_IPADDR
1708c609719bSwdenk
1709c609719bSwdenk		Define a default value for the IP address to use for
171011ccc33fSMarcel Ziswiler		the default Ethernet interface, in case this is not
1711c609719bSwdenk		determined through e.g. bootp.
17121ebcd654SWolfgang Denk		(Environment variable "ipaddr")
1713c609719bSwdenk
1714c609719bSwdenk- Server IP address:
1715c609719bSwdenk		CONFIG_SERVERIP
1716c609719bSwdenk
1717c609719bSwdenk		Defines a default value for the IP address of a TFTP
1718c609719bSwdenk		server to contact when using the "tftboot" command.
17191ebcd654SWolfgang Denk		(Environment variable "serverip")
1720c609719bSwdenk
172197cfe861SRobin Getz		CONFIG_KEEP_SERVERADDR
172297cfe861SRobin Getz
172397cfe861SRobin Getz		Keeps the server's MAC address, in the env 'serveraddr'
172497cfe861SRobin Getz		for passing to bootargs (like Linux's netconsole option)
172597cfe861SRobin Getz
17261ebcd654SWolfgang Denk- Gateway IP address:
17271ebcd654SWolfgang Denk		CONFIG_GATEWAYIP
17281ebcd654SWolfgang Denk
17291ebcd654SWolfgang Denk		Defines a default value for the IP address of the
17301ebcd654SWolfgang Denk		default router where packets to other networks are
17311ebcd654SWolfgang Denk		sent to.
17321ebcd654SWolfgang Denk		(Environment variable "gatewayip")
17331ebcd654SWolfgang Denk
17341ebcd654SWolfgang Denk- Subnet mask:
17351ebcd654SWolfgang Denk		CONFIG_NETMASK
17361ebcd654SWolfgang Denk
17371ebcd654SWolfgang Denk		Defines a default value for the subnet mask (or
17381ebcd654SWolfgang Denk		routing prefix) which is used to determine if an IP
17391ebcd654SWolfgang Denk		address belongs to the local subnet or needs to be
17401ebcd654SWolfgang Denk		forwarded through a router.
17411ebcd654SWolfgang Denk		(Environment variable "netmask")
17421ebcd654SWolfgang Denk
174353a5c424SDavid Updegraff- Multicast TFTP Mode:
174453a5c424SDavid Updegraff		CONFIG_MCAST_TFTP
174553a5c424SDavid Updegraff
174653a5c424SDavid Updegraff		Defines whether you want to support multicast TFTP as per
174753a5c424SDavid Updegraff		rfc-2090; for example to work with atftp.  Lets lots of targets
174811ccc33fSMarcel Ziswiler		tftp down the same boot image concurrently.  Note: the Ethernet
174953a5c424SDavid Updegraff		driver in use must provide a function: mcast() to join/leave a
175053a5c424SDavid Updegraff		multicast group.
175153a5c424SDavid Updegraff
1752c609719bSwdenk- BOOTP Recovery Mode:
1753c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY
1754c609719bSwdenk
1755c609719bSwdenk		If you have many targets in a network that try to
1756c609719bSwdenk		boot using BOOTP, you may want to avoid that all
1757c609719bSwdenk		systems send out BOOTP requests at precisely the same
1758c609719bSwdenk		moment (which would happen for instance at recovery
1759c609719bSwdenk		from a power failure, when all systems will try to
1760c609719bSwdenk		boot, thus flooding the BOOTP server. Defining
1761c609719bSwdenk		CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be
1762c609719bSwdenk		inserted before sending out BOOTP requests. The
17636c33c785SWolfgang Denk		following delays are inserted then:
1764c609719bSwdenk
1765c609719bSwdenk		1st BOOTP request:	delay 0 ... 1 sec
1766c609719bSwdenk		2nd BOOTP request:	delay 0 ... 2 sec
1767c609719bSwdenk		3rd BOOTP request:	delay 0 ... 4 sec
1768c609719bSwdenk		4th and following
1769c609719bSwdenk		BOOTP requests:		delay 0 ... 8 sec
1770c609719bSwdenk
1771fe389a82Sstroese- DHCP Advanced Options:
17721fe80d79SJon Loeliger		You can fine tune the DHCP functionality by defining
17731fe80d79SJon Loeliger		CONFIG_BOOTP_* symbols:
1774fe389a82Sstroese
17751fe80d79SJon Loeliger		CONFIG_BOOTP_SUBNETMASK
17761fe80d79SJon Loeliger		CONFIG_BOOTP_GATEWAY
17771fe80d79SJon Loeliger		CONFIG_BOOTP_HOSTNAME
17781fe80d79SJon Loeliger		CONFIG_BOOTP_NISDOMAIN
17791fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTPATH
17801fe80d79SJon Loeliger		CONFIG_BOOTP_BOOTFILESIZE
17811fe80d79SJon Loeliger		CONFIG_BOOTP_DNS
17821fe80d79SJon Loeliger		CONFIG_BOOTP_DNS2
17831fe80d79SJon Loeliger		CONFIG_BOOTP_SEND_HOSTNAME
17841fe80d79SJon Loeliger		CONFIG_BOOTP_NTPSERVER
17851fe80d79SJon Loeliger		CONFIG_BOOTP_TIMEOFFSET
17861fe80d79SJon Loeliger		CONFIG_BOOTP_VENDOREX
17872c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL
1788fe389a82Sstroese
17895d110f0aSWilson Callan		CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip
17905d110f0aSWilson Callan		environment variable, not the BOOTP server.
1791fe389a82Sstroese
17922c00e099SJoe Hershberger		CONFIG_BOOTP_MAY_FAIL - If the DHCP server is not found
17932c00e099SJoe Hershberger		after the configured retry count, the call will fail
17942c00e099SJoe Hershberger		instead of starting over.  This can be used to fail over
17952c00e099SJoe Hershberger		to Link-local IP address configuration if the DHCP server
17962c00e099SJoe Hershberger		is not available.
17972c00e099SJoe Hershberger
1798fe389a82Sstroese		CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
1799fe389a82Sstroese		serverip from a DHCP server, it is possible that more
1800fe389a82Sstroese		than one DNS serverip is offered to the client.
1801fe389a82Sstroese		If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
1802fe389a82Sstroese		serverip will be stored in the additional environment
1803fe389a82Sstroese		variable "dnsip2". The first DNS serverip is always
1804fe389a82Sstroese		stored in the variable "dnsip", when CONFIG_BOOTP_DNS
18051fe80d79SJon Loeliger		is defined.
1806fe389a82Sstroese
1807fe389a82Sstroese		CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
1808fe389a82Sstroese		to do a dynamic update of a DNS server. To do this, they
1809fe389a82Sstroese		need the hostname of the DHCP requester.
18105d110f0aSWilson Callan		If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content
18111fe80d79SJon Loeliger		of the "hostname" environment variable is passed as
18121fe80d79SJon Loeliger		option 12 to the DHCP server.
1813fe389a82Sstroese
1814d9a2f416SAras Vaichas		CONFIG_BOOTP_DHCP_REQUEST_DELAY
1815d9a2f416SAras Vaichas
1816d9a2f416SAras Vaichas		A 32bit value in microseconds for a delay between
1817d9a2f416SAras Vaichas		receiving a "DHCP Offer" and sending the "DHCP Request".
1818d9a2f416SAras Vaichas		This fixes a problem with certain DHCP servers that don't
1819d9a2f416SAras Vaichas		respond 100% of the time to a "DHCP request". E.g. On an
1820d9a2f416SAras Vaichas		AT91RM9200 processor running at 180MHz, this delay needed
1821d9a2f416SAras Vaichas		to be *at least* 15,000 usec before a Windows Server 2003
1822d9a2f416SAras Vaichas		DHCP server would reply 100% of the time. I recommend at
1823d9a2f416SAras Vaichas		least 50,000 usec to be safe. The alternative is to hope
1824d9a2f416SAras Vaichas		that one of the retries will be successful but note that
1825d9a2f416SAras Vaichas		the DHCP timeout and retry process takes a longer than
1826d9a2f416SAras Vaichas		this delay.
1827d9a2f416SAras Vaichas
1828d22c338eSJoe Hershberger - Link-local IP address negotiation:
1829d22c338eSJoe Hershberger		Negotiate with other link-local clients on the local network
1830d22c338eSJoe Hershberger		for an address that doesn't require explicit configuration.
1831d22c338eSJoe Hershberger		This is especially useful if a DHCP server cannot be guaranteed
1832d22c338eSJoe Hershberger		to exist in all environments that the device must operate.
1833d22c338eSJoe Hershberger
1834d22c338eSJoe Hershberger		See doc/README.link-local for more information.
1835d22c338eSJoe Hershberger
1836a3d991bdSwdenk - CDP Options:
1837a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID
1838a3d991bdSwdenk
1839a3d991bdSwdenk		The device id used in CDP trigger frames.
1840a3d991bdSwdenk
1841a3d991bdSwdenk		CONFIG_CDP_DEVICE_ID_PREFIX
1842a3d991bdSwdenk
1843a3d991bdSwdenk		A two character string which is prefixed to the MAC address
1844a3d991bdSwdenk		of the device.
1845a3d991bdSwdenk
1846a3d991bdSwdenk		CONFIG_CDP_PORT_ID
1847a3d991bdSwdenk
1848a3d991bdSwdenk		A printf format string which contains the ascii name of
1849a3d991bdSwdenk		the port. Normally is set to "eth%d" which sets
185011ccc33fSMarcel Ziswiler		eth0 for the first Ethernet, eth1 for the second etc.
1851a3d991bdSwdenk
1852a3d991bdSwdenk		CONFIG_CDP_CAPABILITIES
1853a3d991bdSwdenk
1854a3d991bdSwdenk		A 32bit integer which indicates the device capabilities;
1855a3d991bdSwdenk		0x00000010 for a normal host which does not forwards.
1856a3d991bdSwdenk
1857a3d991bdSwdenk		CONFIG_CDP_VERSION
1858a3d991bdSwdenk
1859a3d991bdSwdenk		An ascii string containing the version of the software.
1860a3d991bdSwdenk
1861a3d991bdSwdenk		CONFIG_CDP_PLATFORM
1862a3d991bdSwdenk
1863a3d991bdSwdenk		An ascii string containing the name of the platform.
1864a3d991bdSwdenk
1865a3d991bdSwdenk		CONFIG_CDP_TRIGGER
1866a3d991bdSwdenk
1867a3d991bdSwdenk		A 32bit integer sent on the trigger.
1868a3d991bdSwdenk
1869a3d991bdSwdenk		CONFIG_CDP_POWER_CONSUMPTION
1870a3d991bdSwdenk
1871a3d991bdSwdenk		A 16bit integer containing the power consumption of the
1872a3d991bdSwdenk		device in .1 of milliwatts.
1873a3d991bdSwdenk
1874a3d991bdSwdenk		CONFIG_CDP_APPLIANCE_VLAN_TYPE
1875a3d991bdSwdenk
1876a3d991bdSwdenk		A byte containing the id of the VLAN.
1877a3d991bdSwdenk
1878c609719bSwdenk- Status LED:	CONFIG_STATUS_LED
1879c609719bSwdenk
1880c609719bSwdenk		Several configurations allow to display the current
1881c609719bSwdenk		status using a LED. For instance, the LED will blink
1882c609719bSwdenk		fast while running U-Boot code, stop blinking as
1883c609719bSwdenk		soon as a reply to a BOOTP request was received, and
1884c609719bSwdenk		start blinking slow once the Linux kernel is running
1885c609719bSwdenk		(supported by a status LED driver in the Linux
1886c609719bSwdenk		kernel). Defining CONFIG_STATUS_LED enables this
1887c609719bSwdenk		feature in U-Boot.
1888c609719bSwdenk
1889c609719bSwdenk- CAN Support:	CONFIG_CAN_DRIVER
1890c609719bSwdenk
1891c609719bSwdenk		Defining CONFIG_CAN_DRIVER enables CAN driver support
1892c609719bSwdenk		on those systems that support this (optional)
1893c609719bSwdenk		feature, like the TQM8xxL modules.
1894c609719bSwdenk
1895c609719bSwdenk- I2C Support:	CONFIG_HARD_I2C | CONFIG_SOFT_I2C
1896c609719bSwdenk
1897b37c7e5eSwdenk		These enable I2C serial bus commands. Defining either of
1898b37c7e5eSwdenk		(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
189911ccc33fSMarcel Ziswiler		include the appropriate I2C driver for the selected CPU.
1900c609719bSwdenk
1901b37c7e5eSwdenk		This will allow you to use i2c commands at the u-boot
1902602ad3b3SJon Loeliger		command line (as long as you set CONFIG_CMD_I2C in
1903b37c7e5eSwdenk		CONFIG_COMMANDS) and communicate with i2c based realtime
1904b37c7e5eSwdenk		clock chips. See common/cmd_i2c.c for a description of the
1905c609719bSwdenk		command line interface.
1906c609719bSwdenk
1907bb99ad6dSBen Warren		CONFIG_HARD_I2C selects a hardware I2C controller.
1908c609719bSwdenk
1909b37c7e5eSwdenk		CONFIG_SOFT_I2C configures u-boot to use a software (aka
1910b37c7e5eSwdenk		bit-banging) driver instead of CPM or similar hardware
1911b37c7e5eSwdenk		support for I2C.
1912c609719bSwdenk
1913b37c7e5eSwdenk		There are several other quantities that must also be
1914b37c7e5eSwdenk		defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C.
1915c609719bSwdenk
19166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		In both cases you will need to define CONFIG_SYS_I2C_SPEED
1917b37c7e5eSwdenk		to be the frequency (in Hz) at which you wish your i2c bus
19186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie
191911ccc33fSMarcel Ziswiler		the CPU's i2c node address).
1920c609719bSwdenk
19218d321b81SPeter Tyser		Now, the u-boot i2c code for the mpc8xx
1922a47a12beSStefan Roese		(arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node
19238d321b81SPeter Tyser		and so its address should therefore be cleared to 0 (See,
19248d321b81SPeter Tyser		eg, MPC823e User's Manual p.16-473). So, set
19258d321b81SPeter Tyser		CONFIG_SYS_I2C_SLAVE to 0.
1926b37c7e5eSwdenk
19275da71efaSEric Millbrandt		CONFIG_SYS_I2C_INIT_MPC5XXX
19285da71efaSEric Millbrandt
19295da71efaSEric Millbrandt		When a board is reset during an i2c bus transfer
19305da71efaSEric Millbrandt		chips might think that the current transfer is still
19315da71efaSEric Millbrandt		in progress.  Reset the slave devices by sending start
19325da71efaSEric Millbrandt		commands until the slave device responds.
19335da71efaSEric Millbrandt
1934b37c7e5eSwdenk		That's all that's required for CONFIG_HARD_I2C.
1935b37c7e5eSwdenk
1936b37c7e5eSwdenk		If you use the software i2c interface (CONFIG_SOFT_I2C)
1937b37c7e5eSwdenk		then the following macros need to be defined (examples are
1938b37c7e5eSwdenk		from include/configs/lwmon.h):
1939c609719bSwdenk
1940c609719bSwdenk		I2C_INIT
1941c609719bSwdenk
1942b37c7e5eSwdenk		(Optional). Any commands necessary to enable the I2C
1943c609719bSwdenk		controller or configure ports.
1944c609719bSwdenk
1945b37c7e5eSwdenk		eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |=	PB_SCL)
1946b37c7e5eSwdenk
1947c609719bSwdenk		I2C_PORT
1948c609719bSwdenk
1949c609719bSwdenk		(Only for MPC8260 CPU). The I/O port to use (the code
1950c609719bSwdenk		assumes both bits are on the same port). Valid values
1951c609719bSwdenk		are 0..3 for ports A..D.
1952c609719bSwdenk
1953c609719bSwdenk		I2C_ACTIVE
1954c609719bSwdenk
1955c609719bSwdenk		The code necessary to make the I2C data line active
1956c609719bSwdenk		(driven).  If the data line is open collector, this
1957c609719bSwdenk		define can be null.
1958c609719bSwdenk
1959b37c7e5eSwdenk		eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |=  PB_SDA)
1960b37c7e5eSwdenk
1961c609719bSwdenk		I2C_TRISTATE
1962c609719bSwdenk
1963c609719bSwdenk		The code necessary to make the I2C data line tri-stated
1964c609719bSwdenk		(inactive).  If the data line is open collector, this
1965c609719bSwdenk		define can be null.
1966c609719bSwdenk
1967b37c7e5eSwdenk		eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA)
1968b37c7e5eSwdenk
1969c609719bSwdenk		I2C_READ
1970c609719bSwdenk
1971472d5460SYork Sun		Code that returns true if the I2C data line is high,
1972472d5460SYork Sun		false if it is low.
1973c609719bSwdenk
1974b37c7e5eSwdenk		eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0)
1975b37c7e5eSwdenk
1976c609719bSwdenk		I2C_SDA(bit)
1977c609719bSwdenk
1978472d5460SYork Sun		If <bit> is true, sets the I2C data line high. If it
1979472d5460SYork Sun		is false, it clears it (low).
1980c609719bSwdenk
1981b37c7e5eSwdenk		eg: #define I2C_SDA(bit) \
1982b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SDA; \
1983b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SDA
1984b37c7e5eSwdenk
1985c609719bSwdenk		I2C_SCL(bit)
1986c609719bSwdenk
1987472d5460SYork Sun		If <bit> is true, sets the I2C clock line high. If it
1988472d5460SYork Sun		is false, it clears it (low).
1989c609719bSwdenk
1990b37c7e5eSwdenk		eg: #define I2C_SCL(bit) \
1991b37c7e5eSwdenk			if(bit) immr->im_cpm.cp_pbdat |=  PB_SCL; \
1992b37c7e5eSwdenk			else	immr->im_cpm.cp_pbdat &= ~PB_SCL
1993b37c7e5eSwdenk
1994c609719bSwdenk		I2C_DELAY
1995c609719bSwdenk
1996c609719bSwdenk		This delay is invoked four times per clock cycle so this
1997c609719bSwdenk		controls the rate of data transfer.  The data rate thus
1998b37c7e5eSwdenk		is 1 / (I2C_DELAY * 4). Often defined to be something
1999b37c7e5eSwdenk		like:
2000b37c7e5eSwdenk
2001b37c7e5eSwdenk		#define I2C_DELAY  udelay(2)
2002c609719bSwdenk
2003793b5726SMike Frysinger		CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA
2004793b5726SMike Frysinger
2005793b5726SMike Frysinger		If your arch supports the generic GPIO framework (asm/gpio.h),
2006793b5726SMike Frysinger		then you may alternatively define the two GPIOs that are to be
2007793b5726SMike Frysinger		used as SCL / SDA.  Any of the previous I2C_xxx macros will
2008793b5726SMike Frysinger		have GPIO-based defaults assigned to them as appropriate.
2009793b5726SMike Frysinger
2010793b5726SMike Frysinger		You should define these to the GPIO value as given directly to
2011793b5726SMike Frysinger		the generic GPIO functions.
2012793b5726SMike Frysinger
20136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_INIT_BOARD
201447cd00faSwdenk
201547cd00faSwdenk		When a board is reset during an i2c bus transfer
201647cd00faSwdenk		chips might think that the current transfer is still
201747cd00faSwdenk		in progress. On some boards it is possible to access
201847cd00faSwdenk		the i2c SCLK line directly, either by using the
201947cd00faSwdenk		processor pin as a GPIO or by having a second pin
202047cd00faSwdenk		connected to the bus. If this option is defined a
202147cd00faSwdenk		custom i2c_init_board() routine in boards/xxx/board.c
202247cd00faSwdenk		is run early in the boot sequence.
202347cd00faSwdenk
202426a33504SRichard Retanubun		CONFIG_SYS_I2C_BOARD_LATE_INIT
202526a33504SRichard Retanubun
202626a33504SRichard Retanubun		An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is
202726a33504SRichard Retanubun		defined a custom i2c_board_late_init() routine in
202826a33504SRichard Retanubun		boards/xxx/board.c is run AFTER the operations in i2c_init()
202926a33504SRichard Retanubun		is completed. This callpoint can be used to unreset i2c bus
203026a33504SRichard Retanubun		using CPU i2c controller register accesses for CPUs whose i2c
203126a33504SRichard Retanubun		controller provide such a method. It is called at the end of
203226a33504SRichard Retanubun		i2c_init() to allow i2c_init operations to setup the i2c bus
203326a33504SRichard Retanubun		controller on the CPU (e.g. setting bus speed & slave address).
203426a33504SRichard Retanubun
203517ea1177Swdenk		CONFIG_I2CFAST (PPC405GP|PPC405EP only)
203617ea1177Swdenk
203717ea1177Swdenk		This option enables configuration of bi_iic_fast[] flags
203817ea1177Swdenk		in u-boot bd_info structure based on u-boot environment
203917ea1177Swdenk		variable "i2cfast". (see also i2cfast)
204017ea1177Swdenk
2041bb99ad6dSBen Warren		CONFIG_I2C_MULTI_BUS
2042bb99ad6dSBen Warren
2043bb99ad6dSBen Warren		This option allows the use of multiple I2C buses, each of which
2044bb99ad6dSBen Warren		must have a controller.	 At any point in time, only one bus is
2045bb99ad6dSBen Warren		active.	 To switch to a different bus, use the 'i2c dev' command.
2046bb99ad6dSBen Warren		Note that bus numbering is zero-based.
2047bb99ad6dSBen Warren
20486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_NOPROBES
2049bb99ad6dSBen Warren
2050bb99ad6dSBen Warren		This option specifies a list of I2C devices that will be skipped
20510f89c54bSPeter Tyser		when the 'i2c probe' command is issued.	 If CONFIG_I2C_MULTI_BUS
20520f89c54bSPeter Tyser		is set, specify a list of bus-device pairs.  Otherwise, specify
20530f89c54bSPeter Tyser		a 1D array of device addresses
2054bb99ad6dSBen Warren
2055bb99ad6dSBen Warren		e.g.
2056bb99ad6dSBen Warren			#undef	CONFIG_I2C_MULTI_BUS
20576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_NOPROBES {0x50,0x68}
2058bb99ad6dSBen Warren
2059bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on a board with one I2C bus
2060bb99ad6dSBen Warren
2061bb99ad6dSBen Warren			#define CONFIG_I2C_MULTI_BUS
20626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD			#define CONFIG_SYS_I2C_MULTI_NOPROBES	{{0,0x50},{0,0x68},{1,0x54}}
2063bb99ad6dSBen Warren
2064bb99ad6dSBen Warren		will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1
2065bb99ad6dSBen Warren
20666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SPD_BUS_NUM
2067be5e6181STimur Tabi
2068be5e6181STimur Tabi		If defined, then this indicates the I2C bus number for DDR SPD.
2069be5e6181STimur Tabi		If not defined, then U-Boot assumes that SPD is on I2C bus 0.
2070be5e6181STimur Tabi
20716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_RTC_BUS_NUM
20720dc018ecSStefan Roese
20730dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the RTC.
20740dc018ecSStefan Roese		If not defined, then U-Boot assumes that RTC is on I2C bus 0.
20750dc018ecSStefan Roese
20766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_DTT_BUS_NUM
20770dc018ecSStefan Roese
20780dc018ecSStefan Roese		If defined, then this indicates the I2C bus number for the DTT.
20790dc018ecSStefan Roese		If not defined, then U-Boot assumes that DTT is on I2C bus 0.
20800dc018ecSStefan Roese
20816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_I2C_DTT_ADDR:
20829ebbb54fSVictor Gallardo
20839ebbb54fSVictor Gallardo		If defined, specifies the I2C address of the DTT device.
20849ebbb54fSVictor Gallardo		If not defined, then U-Boot uses predefined value for
20859ebbb54fSVictor Gallardo		specified DTT device.
20869ebbb54fSVictor Gallardo
2087be5e6181STimur Tabi		CONFIG_FSL_I2C
2088be5e6181STimur Tabi
2089be5e6181STimur Tabi		Define this option if you want to use Freescale's I2C driver in
20907817cb20SMarcel Ziswiler		drivers/i2c/fsl_i2c.c.
2091be5e6181STimur Tabi
209267b23a32SHeiko Schocher		CONFIG_I2C_MUX
209367b23a32SHeiko Schocher
209467b23a32SHeiko Schocher		Define this option if you have I2C devices reached over 1 .. n
209567b23a32SHeiko Schocher		I2C Muxes like the pca9544a. This option addes a new I2C
209667b23a32SHeiko Schocher		Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a
209767b23a32SHeiko Schocher		new I2C Bus to the existing I2C Busses. If you select the
209867b23a32SHeiko Schocher		new Bus with "i2c dev", u-bbot sends first the commandos for
209967b23a32SHeiko Schocher		the muxes to activate this new "bus".
210067b23a32SHeiko Schocher
210167b23a32SHeiko Schocher		CONFIG_I2C_MULTI_BUS must be also defined, to use this
210267b23a32SHeiko Schocher		feature!
210367b23a32SHeiko Schocher
210467b23a32SHeiko Schocher		Example:
210567b23a32SHeiko Schocher		Adding a new I2C Bus reached over 2 pca9544a muxes
210667b23a32SHeiko Schocher			The First mux with address 70 and channel 6
210767b23a32SHeiko Schocher			The Second mux with address 71 and channel 4
210867b23a32SHeiko Schocher
210967b23a32SHeiko Schocher		=> i2c bus pca9544a:70:6:pca9544a:71:4
211067b23a32SHeiko Schocher
211167b23a32SHeiko Schocher		Use the "i2c bus" command without parameter, to get a list
211267b23a32SHeiko Schocher		of I2C Busses with muxes:
211367b23a32SHeiko Schocher
211467b23a32SHeiko Schocher		=> i2c bus
211567b23a32SHeiko Schocher		Busses reached over muxes:
211667b23a32SHeiko Schocher		Bus ID: 2
211767b23a32SHeiko Schocher		  reached over Mux(es):
211867b23a32SHeiko Schocher		    pca9544a@70 ch: 4
211967b23a32SHeiko Schocher		Bus ID: 3
212067b23a32SHeiko Schocher		  reached over Mux(es):
212167b23a32SHeiko Schocher		    pca9544a@70 ch: 6
212267b23a32SHeiko Schocher		    pca9544a@71 ch: 4
212367b23a32SHeiko Schocher		=>
212467b23a32SHeiko Schocher
212567b23a32SHeiko Schocher		If you now switch to the new I2C Bus 3 with "i2c dev 3"
2126f9a78b8dSMichael Jones		u-boot first sends the command to the mux@70 to enable
2127f9a78b8dSMichael Jones		channel 6, and then the command to the mux@71 to enable
212867b23a32SHeiko Schocher		the channel 4.
212967b23a32SHeiko Schocher
213067b23a32SHeiko Schocher		After that, you can use the "normal" i2c commands as
2131f9a78b8dSMichael Jones		usual to communicate with your I2C devices behind
213267b23a32SHeiko Schocher		the 2 muxes.
213367b23a32SHeiko Schocher
213467b23a32SHeiko Schocher		This option is actually implemented for the bitbanging
213567b23a32SHeiko Schocher		algorithm in common/soft_i2c.c and for the Hardware I2C
213667b23a32SHeiko Schocher		Bus on the MPC8260. But it should be not so difficult
213767b23a32SHeiko Schocher		to add this option to other architectures.
213867b23a32SHeiko Schocher
21392ac6985aSAndrew Dyer		CONFIG_SOFT_I2C_READ_REPEATED_START
21402ac6985aSAndrew Dyer
21412ac6985aSAndrew Dyer		defining this will force the i2c_read() function in
21422ac6985aSAndrew Dyer		the soft_i2c driver to perform an I2C repeated start
21432ac6985aSAndrew Dyer		between writing the address pointer and reading the
21442ac6985aSAndrew Dyer		data.  If this define is omitted the default behaviour
21452ac6985aSAndrew Dyer		of doing a stop-start sequence will be used.  Most I2C
21462ac6985aSAndrew Dyer		devices can use either method, but some require one or
21472ac6985aSAndrew Dyer		the other.
2148be5e6181STimur Tabi
2149c609719bSwdenk- SPI Support:	CONFIG_SPI
2150c609719bSwdenk
2151c609719bSwdenk		Enables SPI driver (so far only tested with
2152c609719bSwdenk		SPI EEPROM, also an instance works with Crystal A/D and
2153c609719bSwdenk		D/As on the SACSng board)
2154c609719bSwdenk
21556639562eSYoshihiro Shimoda		CONFIG_SH_SPI
21566639562eSYoshihiro Shimoda
21576639562eSYoshihiro Shimoda		Enables the driver for SPI controller on SuperH. Currently
21586639562eSYoshihiro Shimoda		only SH7757 is supported.
21596639562eSYoshihiro Shimoda
2160c609719bSwdenk		CONFIG_SPI_X
2161c609719bSwdenk
2162c609719bSwdenk		Enables extended (16-bit) SPI EEPROM addressing.
2163c609719bSwdenk		(symmetrical to CONFIG_I2C_X)
2164c609719bSwdenk
2165c609719bSwdenk		CONFIG_SOFT_SPI
2166c609719bSwdenk
2167c609719bSwdenk		Enables a software (bit-bang) SPI driver rather than
2168c609719bSwdenk		using hardware support. This is a general purpose
2169c609719bSwdenk		driver that only requires three general I/O port pins
2170c609719bSwdenk		(two outputs, one input) to function. If this is
2171c609719bSwdenk		defined, the board configuration must define several
2172c609719bSwdenk		SPI configuration items (port pins to use, etc). For
2173c609719bSwdenk		an example, see include/configs/sacsng.h.
2174c609719bSwdenk
217504a9e118SBen Warren		CONFIG_HARD_SPI
217604a9e118SBen Warren
217704a9e118SBen Warren		Enables a hardware SPI driver for general-purpose reads
217804a9e118SBen Warren		and writes.  As with CONFIG_SOFT_SPI, the board configuration
217904a9e118SBen Warren		must define a list of chip-select function pointers.
218004a9e118SBen Warren		Currently supported on some MPC8xxx processors.	 For an
218104a9e118SBen Warren		example, see include/configs/mpc8349emds.h.
218204a9e118SBen Warren
218338254f45SGuennadi Liakhovetski		CONFIG_MXC_SPI
218438254f45SGuennadi Liakhovetski
218538254f45SGuennadi Liakhovetski		Enables the driver for the SPI controllers on i.MX and MXC
21862e3cd1cdSFabio Estevam		SoCs. Currently i.MX31/35/51 are supported.
218738254f45SGuennadi Liakhovetski
21880133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA
21890133502eSMatthias Fuchs
21900133502eSMatthias Fuchs		Enables FPGA subsystem.
21910133502eSMatthias Fuchs
21920133502eSMatthias Fuchs		CONFIG_FPGA_<vendor>
21930133502eSMatthias Fuchs
21940133502eSMatthias Fuchs		Enables support for specific chip vendors.
21950133502eSMatthias Fuchs		(ALTERA, XILINX)
21960133502eSMatthias Fuchs
21970133502eSMatthias Fuchs		CONFIG_FPGA_<family>
21980133502eSMatthias Fuchs
21990133502eSMatthias Fuchs		Enables support for FPGA family.
22000133502eSMatthias Fuchs		(SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX)
22010133502eSMatthias Fuchs
22020133502eSMatthias Fuchs		CONFIG_FPGA_COUNT
2203c609719bSwdenk
2204c609719bSwdenk		Specify the number of FPGA devices to support.
2205c609719bSwdenk
22066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_PROG_FEEDBACK
2207c609719bSwdenk
2208c609719bSwdenk		Enable printing of hash marks during FPGA configuration.
2209c609719bSwdenk
22106d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_BUSY
2211c609719bSwdenk
2212c609719bSwdenk		Enable checks on FPGA configuration interface busy
2213c609719bSwdenk		status by the configuration function. This option
2214c609719bSwdenk		will require a board or device specific function to
2215c609719bSwdenk		be written.
2216c609719bSwdenk
2217c609719bSwdenk		CONFIG_FPGA_DELAY
2218c609719bSwdenk
2219c609719bSwdenk		If defined, a function that provides delays in the FPGA
2220c609719bSwdenk		configuration driver.
2221c609719bSwdenk
22226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_CTRLC
2223c609719bSwdenk		Allow Control-C to interrupt FPGA configuration
2224c609719bSwdenk
22256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_CHECK_ERROR
2226c609719bSwdenk
2227c609719bSwdenk		Check for configuration errors during FPGA bitfile
2228c609719bSwdenk		loading. For example, abort during Virtex II
2229c609719bSwdenk		configuration if the INIT_B line goes low (which
2230c609719bSwdenk		indicated a CRC error).
2231c609719bSwdenk
22326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_INIT
2233c609719bSwdenk
2234c609719bSwdenk		Maximum time to wait for the INIT_B line to deassert
2235c609719bSwdenk		after PROB_B has been deasserted during a Virtex II
2236c609719bSwdenk		FPGA configuration sequence. The default time is 500
223711ccc33fSMarcel Ziswiler		ms.
2238c609719bSwdenk
22396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_BUSY
2240c609719bSwdenk
2241c609719bSwdenk		Maximum time to wait for BUSY to deassert during
224211ccc33fSMarcel Ziswiler		Virtex II FPGA configuration. The default is 5 ms.
2243c609719bSwdenk
22446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FPGA_WAIT_CONFIG
2245c609719bSwdenk
2246c609719bSwdenk		Time to wait after FPGA configuration. The default is
224711ccc33fSMarcel Ziswiler		200 ms.
2248c609719bSwdenk
2249c609719bSwdenk- Configuration Management:
2250c609719bSwdenk		CONFIG_IDENT_STRING
2251c609719bSwdenk
2252c609719bSwdenk		If defined, this string will be added to the U-Boot
2253c609719bSwdenk		version information (U_BOOT_VERSION)
2254c609719bSwdenk
2255c609719bSwdenk- Vendor Parameter Protection:
2256c609719bSwdenk
2257c609719bSwdenk		U-Boot considers the values of the environment
2258c609719bSwdenk		variables "serial#" (Board Serial Number) and
22597152b1d0Swdenk		"ethaddr" (Ethernet Address) to be parameters that
2260c609719bSwdenk		are set once by the board vendor / manufacturer, and
2261c609719bSwdenk		protects these variables from casual modification by
2262c609719bSwdenk		the user. Once set, these variables are read-only,
2263c609719bSwdenk		and write or delete attempts are rejected. You can
226411ccc33fSMarcel Ziswiler		change this behaviour:
2265c609719bSwdenk
2266c609719bSwdenk		If CONFIG_ENV_OVERWRITE is #defined in your config
2267c609719bSwdenk		file, the write protection for vendor parameters is
226847cd00faSwdenk		completely disabled. Anybody can change or delete
2269c609719bSwdenk		these parameters.
2270c609719bSwdenk
2271c609719bSwdenk		Alternatively, if you #define _both_ CONFIG_ETHADDR
2272c609719bSwdenk		_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
227311ccc33fSMarcel Ziswiler		Ethernet address is installed in the environment,
2274c609719bSwdenk		which can be changed exactly ONCE by the user. [The
2275c609719bSwdenk		serial# is unaffected by this, i. e. it remains
2276c609719bSwdenk		read-only.]
2277c609719bSwdenk
22782598090bSJoe Hershberger		The same can be accomplished in a more flexible way
22792598090bSJoe Hershberger		for any variable by configuring the type of access
22802598090bSJoe Hershberger		to allow for those variables in the ".flags" variable
22812598090bSJoe Hershberger		or define CONFIG_ENV_FLAGS_LIST_STATIC.
22822598090bSJoe Hershberger
2283c609719bSwdenk- Protected RAM:
2284c609719bSwdenk		CONFIG_PRAM
2285c609719bSwdenk
2286c609719bSwdenk		Define this variable to enable the reservation of
2287c609719bSwdenk		"protected RAM", i. e. RAM which is not overwritten
2288c609719bSwdenk		by U-Boot. Define CONFIG_PRAM to hold the number of
2289c609719bSwdenk		kB you want to reserve for pRAM. You can overwrite
2290c609719bSwdenk		this default value by defining an environment
2291c609719bSwdenk		variable "pram" to the number of kB you want to
2292c609719bSwdenk		reserve. Note that the board info structure will
2293c609719bSwdenk		still show the full amount of RAM. If pRAM is
2294c609719bSwdenk		reserved, a new environment variable "mem" will
2295c609719bSwdenk		automatically be defined to hold the amount of
2296c609719bSwdenk		remaining RAM in a form that can be passed as boot
2297c609719bSwdenk		argument to Linux, for instance like that:
2298c609719bSwdenk
2299fe126d8bSWolfgang Denk			setenv bootargs ... mem=\${mem}
2300c609719bSwdenk			saveenv
2301c609719bSwdenk
2302c609719bSwdenk		This way you can tell Linux not to use this memory,
2303c609719bSwdenk		either, which results in a memory region that will
2304c609719bSwdenk		not be affected by reboots.
2305c609719bSwdenk
2306c609719bSwdenk		*WARNING* If your board configuration uses automatic
2307c609719bSwdenk		detection of the RAM size, you must make sure that
2308c609719bSwdenk		this memory test is non-destructive. So far, the
2309c609719bSwdenk		following board configurations are known to be
2310c609719bSwdenk		"pRAM-clean":
2311c609719bSwdenk
23121b0757ecSWolfgang Denk			IVMS8, IVML24, SPD8xx, TQM8xxL,
23131b0757ecSWolfgang Denk			HERMES, IP860, RPXlite, LWMON,
2314544d97e9SWolfgang Denk			FLAGADM, TQM8260
2315c609719bSwdenk
231640fef049SGabe Black- Access to physical memory region (> 4GB)
231740fef049SGabe Black		Some basic support is provided for operations on memory not
231840fef049SGabe Black		normally accessible to U-Boot - e.g. some architectures
231940fef049SGabe Black		support access to more than 4GB of memory on 32-bit
232040fef049SGabe Black		machines using physical address extension or similar.
232140fef049SGabe Black		Define CONFIG_PHYSMEM to access this basic support, which
232240fef049SGabe Black		currently only supports clearing the memory.
232340fef049SGabe Black
2324c609719bSwdenk- Error Recovery:
2325c609719bSwdenk		CONFIG_PANIC_HANG
2326c609719bSwdenk
2327c609719bSwdenk		Define this variable to stop the system in case of a
2328c609719bSwdenk		fatal error, so that you have to reset it manually.
2329c609719bSwdenk		This is probably NOT a good idea for an embedded
233011ccc33fSMarcel Ziswiler		system where you want the system to reboot
2331c609719bSwdenk		automatically as fast as possible, but it may be
2332c609719bSwdenk		useful during development since you can try to debug
2333c609719bSwdenk		the conditions that lead to the situation.
2334c609719bSwdenk
2335c609719bSwdenk		CONFIG_NET_RETRY_COUNT
2336c609719bSwdenk
2337c609719bSwdenk		This variable defines the number of retries for
2338c609719bSwdenk		network operations like ARP, RARP, TFTP, or BOOTP
2339c609719bSwdenk		before giving up the operation. If not defined, a
2340c609719bSwdenk		default value of 5 is used.
2341c609719bSwdenk
234240cb90eeSGuennadi Liakhovetski		CONFIG_ARP_TIMEOUT
234340cb90eeSGuennadi Liakhovetski
234440cb90eeSGuennadi Liakhovetski		Timeout waiting for an ARP reply in milliseconds.
234540cb90eeSGuennadi Liakhovetski
234648a3e999STetsuyuki Kobayashi		CONFIG_NFS_TIMEOUT
234748a3e999STetsuyuki Kobayashi
234848a3e999STetsuyuki Kobayashi		Timeout in milliseconds used in NFS protocol.
234948a3e999STetsuyuki Kobayashi		If you encounter "ERROR: Cannot umount" in nfs command,
235048a3e999STetsuyuki Kobayashi		try longer timeout such as
235148a3e999STetsuyuki Kobayashi		#define CONFIG_NFS_TIMEOUT 10000UL
235248a3e999STetsuyuki Kobayashi
2353c609719bSwdenk- Command Interpreter:
23548078f1a5SWolfgang Denk		CONFIG_AUTO_COMPLETE
235504a85b3bSwdenk
235604a85b3bSwdenk		Enable auto completion of commands using TAB.
235704a85b3bSwdenk
23588078f1a5SWolfgang Denk		Note that this feature has NOT been implemented yet
23598078f1a5SWolfgang Denk		for the "hush" shell.
23608078f1a5SWolfgang Denk
23618078f1a5SWolfgang Denk
23626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_HUSH_PARSER
2363c609719bSwdenk
2364c609719bSwdenk		Define this variable to enable the "hush" shell (from
2365c609719bSwdenk		Busybox) as command line interpreter, thus enabling
2366c609719bSwdenk		powerful command line syntax like
2367c609719bSwdenk		if...then...else...fi conditionals or `&&' and '||'
2368c609719bSwdenk		constructs ("shell scripts").
2369c609719bSwdenk
2370c609719bSwdenk		If undefined, you get the old, much simpler behaviour
2371c609719bSwdenk		with a somewhat smaller memory footprint.
2372c609719bSwdenk
2373c609719bSwdenk
23746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_PROMPT_HUSH_PS2
2375c609719bSwdenk
2376c609719bSwdenk		This defines the secondary prompt string, which is
2377c609719bSwdenk		printed when the command interpreter needs more input
2378c609719bSwdenk		to complete a command. Usually "> ".
2379c609719bSwdenk
2380c609719bSwdenk	Note:
2381c609719bSwdenk
2382c609719bSwdenk		In the current implementation, the local variables
2383c609719bSwdenk		space and global environment variables space are
2384c609719bSwdenk		separated. Local variables are those you define by
23853b57fe0aSwdenk		simply typing `name=value'. To access a local
2386c609719bSwdenk		variable later on, you have write `$name' or
23873b57fe0aSwdenk		`${name}'; to execute the contents of a variable
23883b57fe0aSwdenk		directly type `$name' at the command prompt.
2389c609719bSwdenk
2390c609719bSwdenk		Global environment variables are those you use
2391c609719bSwdenk		setenv/printenv to work with. To run a command stored
2392c609719bSwdenk		in such a variable, you need to use the run command,
2393c609719bSwdenk		and you must not use the '$' sign to access them.
2394c609719bSwdenk
2395c609719bSwdenk		To store commands and special characters in a
2396c609719bSwdenk		variable, please use double quotation marks
2397c609719bSwdenk		surrounding the whole text of the variable, instead
2398c609719bSwdenk		of the backslashes before semicolons and special
2399c609719bSwdenk		symbols.
2400c609719bSwdenk
2401aa0c71acSWolfgang Denk- Commandline Editing and History:
2402aa0c71acSWolfgang Denk		CONFIG_CMDLINE_EDITING
2403aa0c71acSWolfgang Denk
240411ccc33fSMarcel Ziswiler		Enable editing and History functions for interactive
2405aa0c71acSWolfgang Denk		commandline input operations
2406aa0c71acSWolfgang Denk
2407a8c7c708Swdenk- Default Environment:
2408c609719bSwdenk		CONFIG_EXTRA_ENV_SETTINGS
2409c609719bSwdenk
2410c609719bSwdenk		Define this to contain any number of null terminated
2411c609719bSwdenk		strings (variable = value pairs) that will be part of
24127152b1d0Swdenk		the default environment compiled into the boot image.
24132262cfeeSwdenk
2414c609719bSwdenk		For example, place something like this in your
2415c609719bSwdenk		board's config file:
2416c609719bSwdenk
2417c609719bSwdenk		#define CONFIG_EXTRA_ENV_SETTINGS \
2418c609719bSwdenk			"myvar1=value1\0" \
2419c609719bSwdenk			"myvar2=value2\0"
2420c609719bSwdenk
2421c609719bSwdenk		Warning: This method is based on knowledge about the
2422c609719bSwdenk		internal format how the environment is stored by the
24232262cfeeSwdenk		U-Boot code. This is NOT an official, exported
2424c609719bSwdenk		interface! Although it is unlikely that this format
24257152b1d0Swdenk		will change soon, there is no guarantee either.
2426c609719bSwdenk		You better know what you are doing here.
2427c609719bSwdenk
2428c609719bSwdenk		Note: overly (ab)use of the default environment is
2429c609719bSwdenk		discouraged. Make sure to check other ways to preset
243074de7aefSWolfgang Denk		the environment like the "source" command or the
2431c609719bSwdenk		boot command first.
2432c609719bSwdenk
24335e724ca2SStephen Warren		CONFIG_ENV_VARS_UBOOT_CONFIG
24345e724ca2SStephen Warren
24355e724ca2SStephen Warren		Define this in order to add variables describing the
24365e724ca2SStephen Warren		U-Boot build configuration to the default environment.
24375e724ca2SStephen Warren		These will be named arch, cpu, board, vendor, and soc.
24385e724ca2SStephen Warren
24395e724ca2SStephen Warren		Enabling this option will cause the following to be defined:
24405e724ca2SStephen Warren
24415e724ca2SStephen Warren		- CONFIG_SYS_ARCH
24425e724ca2SStephen Warren		- CONFIG_SYS_CPU
24435e724ca2SStephen Warren		- CONFIG_SYS_BOARD
24445e724ca2SStephen Warren		- CONFIG_SYS_VENDOR
24455e724ca2SStephen Warren		- CONFIG_SYS_SOC
24465e724ca2SStephen Warren
24477e27f89fSTom Rini		CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
24487e27f89fSTom Rini
24497e27f89fSTom Rini		Define this in order to add variables describing certain
24507e27f89fSTom Rini		run-time determined information about the hardware to the
24517e27f89fSTom Rini		environment.  These will be named board_name, board_rev.
24527e27f89fSTom Rini
245306fd8538SSimon Glass		CONFIG_DELAY_ENVIRONMENT
245406fd8538SSimon Glass
245506fd8538SSimon Glass		Normally the environment is loaded when the board is
245606fd8538SSimon Glass		intialised so that it is available to U-Boot. This inhibits
245706fd8538SSimon Glass		that so that the environment is not available until
245806fd8538SSimon Glass		explicitly loaded later by U-Boot code. With CONFIG_OF_CONTROL
245906fd8538SSimon Glass		this is instead controlled by the value of
246006fd8538SSimon Glass		/config/load-environment.
246106fd8538SSimon Glass
2462a8c7c708Swdenk- DataFlash Support:
24632abbe075Swdenk		CONFIG_HAS_DATAFLASH
24642abbe075Swdenk
24652abbe075Swdenk		Defining this option enables DataFlash features and
24662abbe075Swdenk		allows to read/write in Dataflash via the standard
24672abbe075Swdenk		commands cp, md...
24682abbe075Swdenk
2469f61ec45eSEric Nelson- Serial Flash support
2470f61ec45eSEric Nelson		CONFIG_CMD_SF
2471f61ec45eSEric Nelson
2472f61ec45eSEric Nelson		Defining this option enables SPI flash commands
2473f61ec45eSEric Nelson		'sf probe/read/write/erase/update'.
2474f61ec45eSEric Nelson
2475f61ec45eSEric Nelson		Usage requires an initial 'probe' to define the serial
2476f61ec45eSEric Nelson		flash parameters, followed by read/write/erase/update
2477f61ec45eSEric Nelson		commands.
2478f61ec45eSEric Nelson
2479f61ec45eSEric Nelson		The following defaults may be provided by the platform
2480f61ec45eSEric Nelson		to handle the common case when only a single serial
2481f61ec45eSEric Nelson		flash is present on the system.
2482f61ec45eSEric Nelson
2483f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_BUS		Bus identifier
2484f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_CS		Chip-select
2485f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_MODE 		(see include/spi.h)
2486f61ec45eSEric Nelson		CONFIG_SF_DEFAULT_SPEED		in Hz
2487f61ec45eSEric Nelson
248824007273SSimon Glass		CONFIG_CMD_SF_TEST
248924007273SSimon Glass
249024007273SSimon Glass		Define this option to include a destructive SPI flash
249124007273SSimon Glass		test ('sf test').
249224007273SSimon Glass
24933f85ce27Swdenk- SystemACE Support:
24943f85ce27Swdenk		CONFIG_SYSTEMACE
24953f85ce27Swdenk
24963f85ce27Swdenk		Adding this option adds support for Xilinx SystemACE
24973f85ce27Swdenk		chips attached via some sort of local bus. The address
249811ccc33fSMarcel Ziswiler		of the chip must also be defined in the
24996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_SYSTEMACE_BASE macro. For example:
25003f85ce27Swdenk
25013f85ce27Swdenk		#define CONFIG_SYSTEMACE
25026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		#define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000
25033f85ce27Swdenk
25043f85ce27Swdenk		When SystemACE support is added, the "ace" device type
25053f85ce27Swdenk		becomes available to the fat commands, i.e. fatls.
25063f85ce27Swdenk
2507ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port:
2508ecb0ccd9SWolfgang Denk		CONFIG_TFTP_PORT
2509ecb0ccd9SWolfgang Denk
251028cb9375SWolfgang Denk		If this is defined, the environment variable tftpsrcp
2511ecb0ccd9SWolfgang Denk		is used to supply the TFTP UDP source port value.
251228cb9375SWolfgang Denk		If tftpsrcp isn't defined, the normal pseudo-random port
2513ecb0ccd9SWolfgang Denk		number generator is used.
2514ecb0ccd9SWolfgang Denk
251528cb9375SWolfgang Denk		Also, the environment variable tftpdstp is used to supply
251628cb9375SWolfgang Denk		the TFTP UDP destination port value.  If tftpdstp isn't
251728cb9375SWolfgang Denk		defined, the normal port 69 is used.
251828cb9375SWolfgang Denk
251928cb9375SWolfgang Denk		The purpose for tftpsrcp is to allow a TFTP server to
2520ecb0ccd9SWolfgang Denk		blindly start the TFTP transfer using the pre-configured
2521ecb0ccd9SWolfgang Denk		target IP address and UDP port. This has the effect of
2522ecb0ccd9SWolfgang Denk		"punching through" the (Windows XP) firewall, allowing
2523ecb0ccd9SWolfgang Denk		the remainder of the TFTP transfer to proceed normally.
2524ecb0ccd9SWolfgang Denk		A better solution is to properly configure the firewall,
2525ecb0ccd9SWolfgang Denk		but sometimes that is not allowed.
2526ecb0ccd9SWolfgang Denk
2527bf36c5d5SSimon Glass- Hashing support:
2528bf36c5d5SSimon Glass		CONFIG_CMD_HASH
2529bf36c5d5SSimon Glass
2530bf36c5d5SSimon Glass		This enables a generic 'hash' command which can produce
2531bf36c5d5SSimon Glass		hashes / digests from a few algorithms (e.g. SHA1, SHA256).
2532bf36c5d5SSimon Glass
2533bf36c5d5SSimon Glass		CONFIG_HASH_VERIFY
2534bf36c5d5SSimon Glass
2535bf36c5d5SSimon Glass		Enable the hash verify command (hash -v). This adds to code
2536bf36c5d5SSimon Glass		size a little.
2537bf36c5d5SSimon Glass
2538bf36c5d5SSimon Glass		CONFIG_SHA1 - support SHA1 hashing
2539bf36c5d5SSimon Glass		CONFIG_SHA256 - support SHA256 hashing
2540bf36c5d5SSimon Glass
2541bf36c5d5SSimon Glass		Note: There is also a sha1sum command, which should perhaps
2542bf36c5d5SSimon Glass		be deprecated in favour of 'hash sha1'.
2543bf36c5d5SSimon Glass
2544a8c7c708Swdenk- Show boot progress:
2545c609719bSwdenk		CONFIG_SHOW_BOOT_PROGRESS
2546c609719bSwdenk
2547c609719bSwdenk		Defining this option allows to add some board-
2548c609719bSwdenk		specific code (calling a user-provided function
2549c609719bSwdenk		"show_boot_progress(int)") that enables you to show
2550c609719bSwdenk		the system's boot progress on some display (for
2551c609719bSwdenk		example, some LED's) on your board. At the moment,
2552c609719bSwdenk		the following checkpoints are implemented:
2553c609719bSwdenk
25543a608ca0SSimon Glass- Detailed boot stage timing
25553a608ca0SSimon Glass		CONFIG_BOOTSTAGE
25563a608ca0SSimon Glass		Define this option to get detailed timing of each stage
25573a608ca0SSimon Glass		of the boot process.
25583a608ca0SSimon Glass
25593a608ca0SSimon Glass		CONFIG_BOOTSTAGE_USER_COUNT
25603a608ca0SSimon Glass		This is the number of available user bootstage records.
25613a608ca0SSimon Glass		Each time you call bootstage_mark(BOOTSTAGE_ID_ALLOC, ...)
25623a608ca0SSimon Glass		a new ID will be allocated from this stash. If you exceed
25633a608ca0SSimon Glass		the limit, recording will stop.
25643a608ca0SSimon Glass
25653a608ca0SSimon Glass		CONFIG_BOOTSTAGE_REPORT
25663a608ca0SSimon Glass		Define this to print a report before boot, similar to this:
25673a608ca0SSimon Glass
25683a608ca0SSimon Glass		Timer summary in microseconds:
25693a608ca0SSimon Glass		       Mark    Elapsed  Stage
25703a608ca0SSimon Glass			  0          0  reset
25713a608ca0SSimon Glass		  3,575,678  3,575,678  board_init_f start
25723a608ca0SSimon Glass		  3,575,695         17  arch_cpu_init A9
25733a608ca0SSimon Glass		  3,575,777         82  arch_cpu_init done
25743a608ca0SSimon Glass		  3,659,598     83,821  board_init_r start
25753a608ca0SSimon Glass		  3,910,375    250,777  main_loop
25763a608ca0SSimon Glass		 29,916,167 26,005,792  bootm_start
25773a608ca0SSimon Glass		 30,361,327    445,160  start_kernel
25783a608ca0SSimon Glass
25792eba38cfSSimon Glass		CONFIG_CMD_BOOTSTAGE
25802eba38cfSSimon Glass		Add a 'bootstage' command which supports printing a report
25812eba38cfSSimon Glass		and un/stashing of bootstage data.
25822eba38cfSSimon Glass
258394fd1316SSimon Glass		CONFIG_BOOTSTAGE_FDT
258494fd1316SSimon Glass		Stash the bootstage information in the FDT. A root 'bootstage'
258594fd1316SSimon Glass		node is created with each bootstage id as a child. Each child
258694fd1316SSimon Glass		has a 'name' property and either 'mark' containing the
258794fd1316SSimon Glass		mark time in microsecond, or 'accum' containing the
258894fd1316SSimon Glass		accumulated time for that bootstage id in microseconds.
258994fd1316SSimon Glass		For example:
259094fd1316SSimon Glass
259194fd1316SSimon Glass		bootstage {
259294fd1316SSimon Glass			154 {
259394fd1316SSimon Glass				name = "board_init_f";
259494fd1316SSimon Glass				mark = <3575678>;
259594fd1316SSimon Glass			};
259694fd1316SSimon Glass			170 {
259794fd1316SSimon Glass				name = "lcd";
259894fd1316SSimon Glass				accum = <33482>;
259994fd1316SSimon Glass			};
260094fd1316SSimon Glass		};
260194fd1316SSimon Glass
260294fd1316SSimon Glass		Code in the Linux kernel can find this in /proc/devicetree.
260394fd1316SSimon Glass
26041372cce2SMarian BalakowiczLegacy uImage format:
26051372cce2SMarian Balakowicz
2606c609719bSwdenk  Arg	Where			When
2607c609719bSwdenk    1	common/cmd_bootm.c	before attempting to boot an image
2608c609719bSwdenk   -1	common/cmd_bootm.c	Image header has bad	 magic number
2609c609719bSwdenk    2	common/cmd_bootm.c	Image header has correct magic number
2610c609719bSwdenk   -2	common/cmd_bootm.c	Image header has bad	 checksum
2611c609719bSwdenk    3	common/cmd_bootm.c	Image header has correct checksum
2612c609719bSwdenk   -3	common/cmd_bootm.c	Image data   has bad	 checksum
2613c609719bSwdenk    4	common/cmd_bootm.c	Image data   has correct checksum
2614c609719bSwdenk   -4	common/cmd_bootm.c	Image is for unsupported architecture
2615c609719bSwdenk    5	common/cmd_bootm.c	Architecture check OK
26161372cce2SMarian Balakowicz   -5	common/cmd_bootm.c	Wrong Image Type (not kernel, multi)
2617c609719bSwdenk    6	common/cmd_bootm.c	Image Type check OK
2618c609719bSwdenk   -6	common/cmd_bootm.c	gunzip uncompression error
2619c609719bSwdenk   -7	common/cmd_bootm.c	Unimplemented compression type
2620c609719bSwdenk    7	common/cmd_bootm.c	Uncompression OK
26211372cce2SMarian Balakowicz    8	common/cmd_bootm.c	No uncompress/copy overwrite error
2622c609719bSwdenk   -9	common/cmd_bootm.c	Unsupported OS (not Linux, BSD, VxWorks, QNX)
26231372cce2SMarian Balakowicz
26241372cce2SMarian Balakowicz    9	common/image.c		Start initial ramdisk verification
26251372cce2SMarian Balakowicz  -10	common/image.c		Ramdisk header has bad	   magic number
26261372cce2SMarian Balakowicz  -11	common/image.c		Ramdisk header has bad	   checksum
26271372cce2SMarian Balakowicz   10	common/image.c		Ramdisk header is OK
26281372cce2SMarian Balakowicz  -12	common/image.c		Ramdisk data   has bad	   checksum
26291372cce2SMarian Balakowicz   11	common/image.c		Ramdisk data   has correct checksum
26301372cce2SMarian Balakowicz   12	common/image.c		Ramdisk verification complete, start loading
263111ccc33fSMarcel Ziswiler  -13	common/image.c		Wrong Image Type (not PPC Linux ramdisk)
26321372cce2SMarian Balakowicz   13	common/image.c		Start multifile image verification
26331372cce2SMarian Balakowicz   14	common/image.c		No initial ramdisk, no multifile, continue.
26341372cce2SMarian Balakowicz
2635ea0364f1SPeter Tyser   15	arch/<arch>/lib/bootm.c All preparation done, transferring control to OS
2636c609719bSwdenk
2637a47a12beSStefan Roese  -30	arch/powerpc/lib/board.c	Fatal error, hang the system
263863e73c9aSwdenk  -31	post/post.c		POST test failed, detected by post_output_backlog()
263963e73c9aSwdenk  -32	post/post.c		POST test failed, detected by post_run_single()
264063e73c9aSwdenk
2641566a494fSHeiko Schocher   34	common/cmd_doc.c	before loading a Image from a DOC device
2642566a494fSHeiko Schocher  -35	common/cmd_doc.c	Bad usage of "doc" command
2643566a494fSHeiko Schocher   35	common/cmd_doc.c	correct usage of "doc" command
2644566a494fSHeiko Schocher  -36	common/cmd_doc.c	No boot device
2645566a494fSHeiko Schocher   36	common/cmd_doc.c	correct boot device
2646566a494fSHeiko Schocher  -37	common/cmd_doc.c	Unknown Chip ID on boot device
2647566a494fSHeiko Schocher   37	common/cmd_doc.c	correct chip ID found, device available
2648566a494fSHeiko Schocher  -38	common/cmd_doc.c	Read Error on boot device
2649566a494fSHeiko Schocher   38	common/cmd_doc.c	reading Image header from DOC device OK
2650566a494fSHeiko Schocher  -39	common/cmd_doc.c	Image header has bad magic number
2651566a494fSHeiko Schocher   39	common/cmd_doc.c	Image header has correct magic number
2652566a494fSHeiko Schocher  -40	common/cmd_doc.c	Error reading Image from DOC device
2653566a494fSHeiko Schocher   40	common/cmd_doc.c	Image header has correct magic number
2654566a494fSHeiko Schocher   41	common/cmd_ide.c	before loading a Image from a IDE device
2655566a494fSHeiko Schocher  -42	common/cmd_ide.c	Bad usage of "ide" command
2656566a494fSHeiko Schocher   42	common/cmd_ide.c	correct usage of "ide" command
2657566a494fSHeiko Schocher  -43	common/cmd_ide.c	No boot device
2658566a494fSHeiko Schocher   43	common/cmd_ide.c	boot device found
2659566a494fSHeiko Schocher  -44	common/cmd_ide.c	Device not available
2660566a494fSHeiko Schocher   44	common/cmd_ide.c	Device available
2661566a494fSHeiko Schocher  -45	common/cmd_ide.c	wrong partition selected
2662566a494fSHeiko Schocher   45	common/cmd_ide.c	partition selected
2663566a494fSHeiko Schocher  -46	common/cmd_ide.c	Unknown partition table
2664566a494fSHeiko Schocher   46	common/cmd_ide.c	valid partition table found
2665566a494fSHeiko Schocher  -47	common/cmd_ide.c	Invalid partition type
2666566a494fSHeiko Schocher   47	common/cmd_ide.c	correct partition type
2667566a494fSHeiko Schocher  -48	common/cmd_ide.c	Error reading Image Header on boot device
2668566a494fSHeiko Schocher   48	common/cmd_ide.c	reading Image Header from IDE device OK
2669566a494fSHeiko Schocher  -49	common/cmd_ide.c	Image header has bad magic number
2670566a494fSHeiko Schocher   49	common/cmd_ide.c	Image header has correct magic number
2671566a494fSHeiko Schocher  -50	common/cmd_ide.c	Image header has bad	 checksum
2672566a494fSHeiko Schocher   50	common/cmd_ide.c	Image header has correct checksum
2673566a494fSHeiko Schocher  -51	common/cmd_ide.c	Error reading Image from IDE device
2674566a494fSHeiko Schocher   51	common/cmd_ide.c	reading Image from IDE device OK
2675566a494fSHeiko Schocher   52	common/cmd_nand.c	before loading a Image from a NAND device
2676566a494fSHeiko Schocher  -53	common/cmd_nand.c	Bad usage of "nand" command
2677566a494fSHeiko Schocher   53	common/cmd_nand.c	correct usage of "nand" command
2678566a494fSHeiko Schocher  -54	common/cmd_nand.c	No boot device
2679566a494fSHeiko Schocher   54	common/cmd_nand.c	boot device found
2680566a494fSHeiko Schocher  -55	common/cmd_nand.c	Unknown Chip ID on boot device
2681566a494fSHeiko Schocher   55	common/cmd_nand.c	correct chip ID found, device available
2682566a494fSHeiko Schocher  -56	common/cmd_nand.c	Error reading Image Header on boot device
2683566a494fSHeiko Schocher   56	common/cmd_nand.c	reading Image Header from NAND device OK
2684566a494fSHeiko Schocher  -57	common/cmd_nand.c	Image header has bad magic number
2685566a494fSHeiko Schocher   57	common/cmd_nand.c	Image header has correct magic number
2686566a494fSHeiko Schocher  -58	common/cmd_nand.c	Error reading Image from NAND device
2687566a494fSHeiko Schocher   58	common/cmd_nand.c	reading Image from NAND device OK
2688c609719bSwdenk
2689566a494fSHeiko Schocher  -60	common/env_common.c	Environment has a bad CRC, using default
2690c609719bSwdenk
2691566a494fSHeiko Schocher   64	net/eth.c		starting with Ethernet configuration.
2692566a494fSHeiko Schocher  -64	net/eth.c		no Ethernet found.
2693566a494fSHeiko Schocher   65	net/eth.c		Ethernet found.
2694206c60cbSwdenk
2695566a494fSHeiko Schocher  -80	common/cmd_net.c	usage wrong
2696566a494fSHeiko Schocher   80	common/cmd_net.c	before calling NetLoop()
269711ccc33fSMarcel Ziswiler  -81	common/cmd_net.c	some error in NetLoop() occurred
2698566a494fSHeiko Schocher   81	common/cmd_net.c	NetLoop() back without error
2699566a494fSHeiko Schocher  -82	common/cmd_net.c	size == 0 (File with size 0 loaded)
2700566a494fSHeiko Schocher   82	common/cmd_net.c	trying automatic boot
270174de7aefSWolfgang Denk   83	common/cmd_net.c	running "source" command
270274de7aefSWolfgang Denk  -83	common/cmd_net.c	some error in automatic boot or "source" command
2703566a494fSHeiko Schocher   84	common/cmd_net.c	end without errors
2704c609719bSwdenk
27051372cce2SMarian BalakowiczFIT uImage format:
27061372cce2SMarian Balakowicz
27071372cce2SMarian Balakowicz  Arg	Where			When
27081372cce2SMarian Balakowicz  100	common/cmd_bootm.c	Kernel FIT Image has correct format
27091372cce2SMarian Balakowicz -100	common/cmd_bootm.c	Kernel FIT Image has incorrect format
27101372cce2SMarian Balakowicz  101	common/cmd_bootm.c	No Kernel subimage unit name, using configuration
27111372cce2SMarian Balakowicz -101	common/cmd_bootm.c	Can't get configuration for kernel subimage
27121372cce2SMarian Balakowicz  102	common/cmd_bootm.c	Kernel unit name specified
27131372cce2SMarian Balakowicz -103	common/cmd_bootm.c	Can't get kernel subimage node offset
2714f773bea8SMarian Balakowicz  103	common/cmd_bootm.c	Found configuration node
27151372cce2SMarian Balakowicz  104	common/cmd_bootm.c	Got kernel subimage node offset
27161372cce2SMarian Balakowicz -104	common/cmd_bootm.c	Kernel subimage hash verification failed
27171372cce2SMarian Balakowicz  105	common/cmd_bootm.c	Kernel subimage hash verification OK
27181372cce2SMarian Balakowicz -105	common/cmd_bootm.c	Kernel subimage is for unsupported architecture
27191372cce2SMarian Balakowicz  106	common/cmd_bootm.c	Architecture check OK
272011ccc33fSMarcel Ziswiler -106	common/cmd_bootm.c	Kernel subimage has wrong type
272111ccc33fSMarcel Ziswiler  107	common/cmd_bootm.c	Kernel subimage type OK
27221372cce2SMarian Balakowicz -107	common/cmd_bootm.c	Can't get kernel subimage data/size
27231372cce2SMarian Balakowicz  108	common/cmd_bootm.c	Got kernel subimage data/size
27241372cce2SMarian Balakowicz -108	common/cmd_bootm.c	Wrong image type (not legacy, FIT)
27251372cce2SMarian Balakowicz -109	common/cmd_bootm.c	Can't get kernel subimage type
27261372cce2SMarian Balakowicz -110	common/cmd_bootm.c	Can't get kernel subimage comp
27271372cce2SMarian Balakowicz -111	common/cmd_bootm.c	Can't get kernel subimage os
27281372cce2SMarian Balakowicz -112	common/cmd_bootm.c	Can't get kernel subimage load address
27291372cce2SMarian Balakowicz -113	common/cmd_bootm.c	Image uncompress/copy overwrite error
27301372cce2SMarian Balakowicz
27311372cce2SMarian Balakowicz  120	common/image.c		Start initial ramdisk verification
27321372cce2SMarian Balakowicz -120	common/image.c		Ramdisk FIT image has incorrect format
27331372cce2SMarian Balakowicz  121	common/image.c		Ramdisk FIT image has correct format
273411ccc33fSMarcel Ziswiler  122	common/image.c		No ramdisk subimage unit name, using configuration
27351372cce2SMarian Balakowicz -122	common/image.c		Can't get configuration for ramdisk subimage
27361372cce2SMarian Balakowicz  123	common/image.c		Ramdisk unit name specified
27371372cce2SMarian Balakowicz -124	common/image.c		Can't get ramdisk subimage node offset
27381372cce2SMarian Balakowicz  125	common/image.c		Got ramdisk subimage node offset
27391372cce2SMarian Balakowicz -125	common/image.c		Ramdisk subimage hash verification failed
27401372cce2SMarian Balakowicz  126	common/image.c		Ramdisk subimage hash verification OK
27411372cce2SMarian Balakowicz -126	common/image.c		Ramdisk subimage for unsupported architecture
27421372cce2SMarian Balakowicz  127	common/image.c		Architecture check OK
27431372cce2SMarian Balakowicz -127	common/image.c		Can't get ramdisk subimage data/size
27441372cce2SMarian Balakowicz  128	common/image.c		Got ramdisk subimage data/size
27451372cce2SMarian Balakowicz  129	common/image.c		Can't get ramdisk load address
27461372cce2SMarian Balakowicz -129	common/image.c		Got ramdisk load address
27471372cce2SMarian Balakowicz
274811ccc33fSMarcel Ziswiler -130	common/cmd_doc.c	Incorrect FIT image format
27491372cce2SMarian Balakowicz  131	common/cmd_doc.c	FIT image format OK
27501372cce2SMarian Balakowicz
275111ccc33fSMarcel Ziswiler -140	common/cmd_ide.c	Incorrect FIT image format
27521372cce2SMarian Balakowicz  141	common/cmd_ide.c	FIT image format OK
27531372cce2SMarian Balakowicz
275411ccc33fSMarcel Ziswiler -150	common/cmd_nand.c	Incorrect FIT image format
27551372cce2SMarian Balakowicz  151	common/cmd_nand.c	FIT image format OK
27561372cce2SMarian Balakowicz
2757d95f6ec7SGabe Black- FIT image support:
2758d95f6ec7SGabe Black		CONFIG_FIT
2759d95f6ec7SGabe Black		Enable support for the FIT uImage format.
2760d95f6ec7SGabe Black
2761d95f6ec7SGabe Black		CONFIG_FIT_BEST_MATCH
2762d95f6ec7SGabe Black		When no configuration is explicitly selected, default to the
2763d95f6ec7SGabe Black		one whose fdt's compatibility field best matches that of
2764d95f6ec7SGabe Black		U-Boot itself. A match is considered "best" if it matches the
2765d95f6ec7SGabe Black		most specific compatibility entry of U-Boot's fdt's root node.
2766d95f6ec7SGabe Black		The order of entries in the configuration's fdt is ignored.
2767d95f6ec7SGabe Black
27684cf2609bSWolfgang Denk- Standalone program support:
27694cf2609bSWolfgang Denk		CONFIG_STANDALONE_LOAD_ADDR
27704cf2609bSWolfgang Denk
27716feff899SWolfgang Denk		This option defines a board specific value for the
27726feff899SWolfgang Denk		address where standalone program gets loaded, thus
27736feff899SWolfgang Denk		overwriting the architecture dependent default
27744cf2609bSWolfgang Denk		settings.
27754cf2609bSWolfgang Denk
27764cf2609bSWolfgang Denk- Frame Buffer Address:
27774cf2609bSWolfgang Denk		CONFIG_FB_ADDR
27784cf2609bSWolfgang Denk
27794cf2609bSWolfgang Denk		Define CONFIG_FB_ADDR if you want to use specific
278044a53b57SWolfgang Denk		address for frame buffer.  This is typically the case
278144a53b57SWolfgang Denk		when using a graphics controller has separate video
278244a53b57SWolfgang Denk		memory.  U-Boot will then place the frame buffer at
278344a53b57SWolfgang Denk		the given address instead of dynamically reserving it
278444a53b57SWolfgang Denk		in system RAM by calling lcd_setmem(), which grabs
278544a53b57SWolfgang Denk		the memory for the frame buffer depending on the
278644a53b57SWolfgang Denk		configured panel size.
27874cf2609bSWolfgang Denk
27884cf2609bSWolfgang Denk		Please see board_init_f function.
27894cf2609bSWolfgang Denk
2790cccfc2abSDetlev Zundel- Automatic software updates via TFTP server
2791cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP
2792cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_CNT_MAX
2793cccfc2abSDetlev Zundel		CONFIG_UPDATE_TFTP_MSEC_MAX
2794cccfc2abSDetlev Zundel
2795cccfc2abSDetlev Zundel		These options enable and control the auto-update feature;
2796cccfc2abSDetlev Zundel		for a more detailed description refer to doc/README.update.
2797cccfc2abSDetlev Zundel
2798cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support)
2799cccfc2abSDetlev Zundel		CONFIG_MTD_DEVICE
2800cccfc2abSDetlev Zundel
2801cccfc2abSDetlev Zundel		Adds the MTD device infrastructure from the Linux kernel.
2802cccfc2abSDetlev Zundel		Needed for mtdparts command support.
2803cccfc2abSDetlev Zundel
2804cccfc2abSDetlev Zundel		CONFIG_MTD_PARTITIONS
2805cccfc2abSDetlev Zundel
2806cccfc2abSDetlev Zundel		Adds the MTD partitioning infrastructure from the Linux
2807cccfc2abSDetlev Zundel		kernel. Needed for UBI support.
2808cccfc2abSDetlev Zundel
280970c219cdSJoe Hershberger- UBI support
281070c219cdSJoe Hershberger		CONFIG_CMD_UBI
281170c219cdSJoe Hershberger
281270c219cdSJoe Hershberger		Adds commands for interacting with MTD partitions formatted
281370c219cdSJoe Hershberger		with the UBI flash translation layer
281470c219cdSJoe Hershberger
281570c219cdSJoe Hershberger		Requires also defining CONFIG_RBTREE
281670c219cdSJoe Hershberger
2817147162daSJoe Hershberger		CONFIG_UBI_SILENCE_MSG
2818147162daSJoe Hershberger
2819147162daSJoe Hershberger		Make the verbose messages from UBI stop printing.  This leaves
2820147162daSJoe Hershberger		warnings and errors enabled.
2821147162daSJoe Hershberger
282270c219cdSJoe Hershberger- UBIFS support
282370c219cdSJoe Hershberger		CONFIG_CMD_UBIFS
282470c219cdSJoe Hershberger
282570c219cdSJoe Hershberger		Adds commands for interacting with UBI volumes formatted as
282670c219cdSJoe Hershberger		UBIFS.  UBIFS is read-only in u-boot.
282770c219cdSJoe Hershberger
282870c219cdSJoe Hershberger		Requires UBI support as well as CONFIG_LZO
282970c219cdSJoe Hershberger
2830147162daSJoe Hershberger		CONFIG_UBIFS_SILENCE_MSG
2831147162daSJoe Hershberger
2832147162daSJoe Hershberger		Make the verbose messages from UBIFS stop printing.  This leaves
2833147162daSJoe Hershberger		warnings and errors enabled.
2834147162daSJoe Hershberger
28356a11cf48SDaniel Schwierzeck- SPL framework
28366a11cf48SDaniel Schwierzeck		CONFIG_SPL
28376a11cf48SDaniel Schwierzeck		Enable building of SPL globally.
28386a11cf48SDaniel Schwierzeck
283995579793STom Rini		CONFIG_SPL_LDSCRIPT
284095579793STom Rini		LDSCRIPT for linking the SPL binary.
284195579793STom Rini
28426ebc3461SAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT
28436ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL, BSS included.
28446ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory
28456ebc3461SAlbert ARIBAUD		used by SPL from _start to __bss_end does not exceed it.
28468960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
28476ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
28486ebc3461SAlbert ARIBAUD
284995579793STom Rini		CONFIG_SPL_MAX_SIZE
28506ebc3461SAlbert ARIBAUD		Maximum size of the SPL image (text, data, rodata, and
28516ebc3461SAlbert ARIBAUD		linker lists sections), BSS excluded.
28526ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual size does
28536ebc3461SAlbert ARIBAUD		not exceed it.
285495579793STom Rini
28556a11cf48SDaniel Schwierzeck		CONFIG_SPL_TEXT_BASE
28566a11cf48SDaniel Schwierzeck		TEXT_BASE for linking the SPL binary.
28576a11cf48SDaniel Schwierzeck
285894a45bb1SScott Wood		CONFIG_SPL_RELOC_TEXT_BASE
285994a45bb1SScott Wood		Address to relocate to.  If unspecified, this is equal to
286094a45bb1SScott Wood		CONFIG_SPL_TEXT_BASE (i.e. no relocation is done).
286194a45bb1SScott Wood
286295579793STom Rini		CONFIG_SPL_BSS_START_ADDR
286395579793STom Rini		Link address for the BSS within the SPL binary.
286495579793STom Rini
286595579793STom Rini		CONFIG_SPL_BSS_MAX_SIZE
28666ebc3461SAlbert ARIBAUD		Maximum size in memory allocated to the SPL BSS.
28676ebc3461SAlbert ARIBAUD		When defined, the linker checks that the actual memory used
28686ebc3461SAlbert ARIBAUD		by SPL from __bss_start to __bss_end does not exceed it.
28698960af8bSAlbert ARIBAUD		CONFIG_SPL_MAX_FOOTPRINT and CONFIG_SPL_BSS_MAX_SIZE
28706ebc3461SAlbert ARIBAUD		must not be both defined at the same time.
287195579793STom Rini
287295579793STom Rini		CONFIG_SPL_STACK
287395579793STom Rini		Adress of the start of the stack SPL will use
287495579793STom Rini
287594a45bb1SScott Wood		CONFIG_SPL_RELOC_STACK
287694a45bb1SScott Wood		Adress of the start of the stack SPL will use after
287794a45bb1SScott Wood		relocation.  If unspecified, this is equal to
287894a45bb1SScott Wood		CONFIG_SPL_STACK.
287994a45bb1SScott Wood
288095579793STom Rini		CONFIG_SYS_SPL_MALLOC_START
288195579793STom Rini		Starting address of the malloc pool used in SPL.
288295579793STom Rini
288395579793STom Rini		CONFIG_SYS_SPL_MALLOC_SIZE
288495579793STom Rini		The size of the malloc pool used in SPL.
28856a11cf48SDaniel Schwierzeck
288647f7bcaeSTom Rini		CONFIG_SPL_FRAMEWORK
288747f7bcaeSTom Rini		Enable the SPL framework under common/.  This framework
288847f7bcaeSTom Rini		supports MMC, NAND and YMODEM loading of U-Boot and NAND
288947f7bcaeSTom Rini		NAND loading of the Linux Kernel.
289047f7bcaeSTom Rini
2891861a86f4STom Rini		CONFIG_SPL_DISPLAY_PRINT
2892861a86f4STom Rini		For ARM, enable an optional function to print more information
2893861a86f4STom Rini		about the running system.
2894861a86f4STom Rini
28954b919725SScott Wood		CONFIG_SPL_INIT_MINIMAL
28964b919725SScott Wood		Arch init code should be built for a very small image
28974b919725SScott Wood
28986a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBCOMMON_SUPPORT
28996a11cf48SDaniel Schwierzeck		Support for common/libcommon.o in SPL binary
29006a11cf48SDaniel Schwierzeck
29016a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBDISK_SUPPORT
29026a11cf48SDaniel Schwierzeck		Support for disk/libdisk.o in SPL binary
29036a11cf48SDaniel Schwierzeck
29046a11cf48SDaniel Schwierzeck		CONFIG_SPL_I2C_SUPPORT
29056a11cf48SDaniel Schwierzeck		Support for drivers/i2c/libi2c.o in SPL binary
29066a11cf48SDaniel Schwierzeck
29076a11cf48SDaniel Schwierzeck		CONFIG_SPL_GPIO_SUPPORT
29086a11cf48SDaniel Schwierzeck		Support for drivers/gpio/libgpio.o in SPL binary
29096a11cf48SDaniel Schwierzeck
29106a11cf48SDaniel Schwierzeck		CONFIG_SPL_MMC_SUPPORT
29116a11cf48SDaniel Schwierzeck		Support for drivers/mmc/libmmc.o in SPL binary
29126a11cf48SDaniel Schwierzeck
291395579793STom Rini		CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR,
291495579793STom Rini		CONFIG_SYS_U_BOOT_MAX_SIZE_SECTORS,
291595579793STom Rini		CONFIG_SYS_MMC_SD_FAT_BOOT_PARTITION
291695579793STom Rini		Address, size and partition on the MMC to load U-Boot from
291795579793STom Rini		when the MMC is being used in raw mode.
291895579793STom Rini
291995579793STom Rini		CONFIG_SPL_FAT_SUPPORT
292095579793STom Rini		Support for fs/fat/libfat.o in SPL binary
292195579793STom Rini
292295579793STom Rini		CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME
292395579793STom Rini		Filename to read to load U-Boot when reading from FAT
292495579793STom Rini
292506f60ae3SScott Wood		CONFIG_SPL_MPC83XX_WAIT_FOR_NAND
292606f60ae3SScott Wood		Set this for NAND SPL on PPC mpc83xx targets, so that
292706f60ae3SScott Wood		start.S waits for the rest of the SPL to load before
292806f60ae3SScott Wood		continuing (the hardware starts execution after just
292906f60ae3SScott Wood		loading the first page rather than the full 4K).
293006f60ae3SScott Wood
29316f2f01b9SScott Wood		CONFIG_SPL_NAND_BASE
29326f2f01b9SScott Wood		Include nand_base.c in the SPL.  Requires
29336f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS.
29346f2f01b9SScott Wood
29356f2f01b9SScott Wood		CONFIG_SPL_NAND_DRIVERS
29366f2f01b9SScott Wood		SPL uses normal NAND drivers, not minimal drivers.
29376f2f01b9SScott Wood
29386f2f01b9SScott Wood		CONFIG_SPL_NAND_ECC
29396f2f01b9SScott Wood		Include standard software ECC in the SPL
29406f2f01b9SScott Wood
294195579793STom Rini		CONFIG_SPL_NAND_SIMPLE
29427d4b7955SScott Wood		Support for NAND boot using simple NAND drivers that
29437d4b7955SScott Wood		expose the cmd_ctrl() interface.
294495579793STom Rini
294595579793STom Rini		CONFIG_SYS_NAND_5_ADDR_CYCLE, CONFIG_SYS_NAND_PAGE_COUNT,
294695579793STom Rini		CONFIG_SYS_NAND_PAGE_SIZE, CONFIG_SYS_NAND_OOBSIZE,
294795579793STom Rini		CONFIG_SYS_NAND_BLOCK_SIZE, CONFIG_SYS_NAND_BAD_BLOCK_POS,
294895579793STom Rini		CONFIG_SYS_NAND_ECCPOS, CONFIG_SYS_NAND_ECCSIZE,
294995579793STom Rini		CONFIG_SYS_NAND_ECCBYTES
295095579793STom Rini		Defines the size and behavior of the NAND that SPL uses
29517d4b7955SScott Wood		to read U-Boot
295295579793STom Rini
295395579793STom Rini		CONFIG_SYS_NAND_U_BOOT_OFFS
29547d4b7955SScott Wood		Location in NAND to read U-Boot from
29557d4b7955SScott Wood
29567d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_DST
29577d4b7955SScott Wood		Location in memory to load U-Boot to
29587d4b7955SScott Wood
29597d4b7955SScott Wood		CONFIG_SYS_NAND_U_BOOT_SIZE
29607d4b7955SScott Wood		Size of image to load
296195579793STom Rini
296295579793STom Rini		CONFIG_SYS_NAND_U_BOOT_START
29637d4b7955SScott Wood		Entry point in loaded image to jump to
296495579793STom Rini
296595579793STom Rini		CONFIG_SYS_NAND_HW_ECC_OOBFIRST
296695579793STom Rini		Define this if you need to first read the OOB and then the
296795579793STom Rini		data. This is used for example on davinci plattforms.
296895579793STom Rini
296995579793STom Rini		CONFIG_SPL_OMAP3_ID_NAND
297095579793STom Rini		Support for an OMAP3-specific set of functions to return the
297195579793STom Rini		ID and MFR of the first attached NAND chip, if present.
297295579793STom Rini
29736a11cf48SDaniel Schwierzeck		CONFIG_SPL_SERIAL_SUPPORT
29746a11cf48SDaniel Schwierzeck		Support for drivers/serial/libserial.o in SPL binary
29756a11cf48SDaniel Schwierzeck
29766a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_FLASH_SUPPORT
29776a11cf48SDaniel Schwierzeck		Support for drivers/mtd/spi/libspi_flash.o in SPL binary
29786a11cf48SDaniel Schwierzeck
29796a11cf48SDaniel Schwierzeck		CONFIG_SPL_SPI_SUPPORT
29806a11cf48SDaniel Schwierzeck		Support for drivers/spi/libspi.o in SPL binary
29816a11cf48SDaniel Schwierzeck
2982c57b953dSPavel Machek		CONFIG_SPL_RAM_DEVICE
2983c57b953dSPavel Machek		Support for running image already present in ram, in SPL binary
2984c57b953dSPavel Machek
29856a11cf48SDaniel Schwierzeck		CONFIG_SPL_LIBGENERIC_SUPPORT
29866a11cf48SDaniel Schwierzeck		Support for lib/libgeneric.o in SPL binary
29871372cce2SMarian Balakowicz
298874752baaSScott Wood		CONFIG_SPL_PAD_TO
29896113d3f2SBenoît Thébaudeau		Image offset to which the SPL should be padded before appending
29906113d3f2SBenoît Thébaudeau		the SPL payload. By default, this is defined as
29916113d3f2SBenoît Thébaudeau		CONFIG_SPL_MAX_SIZE, or 0 if CONFIG_SPL_MAX_SIZE is undefined.
29926113d3f2SBenoît Thébaudeau		CONFIG_SPL_PAD_TO must be either 0, meaning to append the SPL
29936113d3f2SBenoît Thébaudeau		payload without any padding, or >= CONFIG_SPL_MAX_SIZE.
299474752baaSScott Wood
2995ca2fca22SScott Wood		CONFIG_SPL_TARGET
2996ca2fca22SScott Wood		Final target image containing SPL and payload.  Some SPLs
2997ca2fca22SScott Wood		use an arch-specific makefile fragment instead, for
2998ca2fca22SScott Wood		example if more than one image needs to be produced.
2999ca2fca22SScott Wood
3000c609719bSwdenkModem Support:
3001c609719bSwdenk--------------
3002c609719bSwdenk
3003566e5cf4SWolfgang Denk[so far only for SMDK2400 boards]
3004c609719bSwdenk
300511ccc33fSMarcel Ziswiler- Modem support enable:
3006c609719bSwdenk		CONFIG_MODEM_SUPPORT
3007c609719bSwdenk
3008c609719bSwdenk- RTS/CTS Flow control enable:
3009c609719bSwdenk		CONFIG_HWFLOW
3010c609719bSwdenk
3011c609719bSwdenk- Modem debug support:
3012c609719bSwdenk		CONFIG_MODEM_SUPPORT_DEBUG
3013c609719bSwdenk
3014c609719bSwdenk		Enables debugging stuff (char screen[1024], dbg())
3015c609719bSwdenk		for modem support. Useful only with BDI2000.
3016c609719bSwdenk
3017a8c7c708Swdenk- Interrupt support (PPC):
3018a8c7c708Swdenk
3019a8c7c708Swdenk		There are common interrupt_init() and timer_interrupt()
3020a8c7c708Swdenk		for all PPC archs. interrupt_init() calls interrupt_init_cpu()
302111ccc33fSMarcel Ziswiler		for CPU specific initialization. interrupt_init_cpu()
3022a8c7c708Swdenk		should set decrementer_count to appropriate value. If
302311ccc33fSMarcel Ziswiler		CPU resets decrementer automatically after interrupt
3024a8c7c708Swdenk		(ppc4xx) it should set decrementer_count to zero.
302511ccc33fSMarcel Ziswiler		timer_interrupt() calls timer_interrupt_cpu() for CPU
3026a8c7c708Swdenk		specific handling. If board has watchdog / status_led
3027a8c7c708Swdenk		/ other_activity_monitor it works automatically from
3028a8c7c708Swdenk		general timer_interrupt().
3029a8c7c708Swdenk
3030c609719bSwdenk- General:
3031c609719bSwdenk
3032c609719bSwdenk		In the target system modem support is enabled when a
3033c609719bSwdenk		specific key (key combination) is pressed during
3034c609719bSwdenk		power-on. Otherwise U-Boot will boot normally
303511ccc33fSMarcel Ziswiler		(autoboot). The key_pressed() function is called from
3036c609719bSwdenk		board_init(). Currently key_pressed() is a dummy
3037c609719bSwdenk		function, returning 1 and thus enabling modem
3038c609719bSwdenk		initialization.
3039c609719bSwdenk
3040c609719bSwdenk		If there are no modem init strings in the
3041c609719bSwdenk		environment, U-Boot proceed to autoboot; the
3042c609719bSwdenk		previous output (banner, info printfs) will be
304311ccc33fSMarcel Ziswiler		suppressed, though.
3044c609719bSwdenk
3045c609719bSwdenk		See also: doc/README.Modem
3046c609719bSwdenk
30479660e442SHelmut RaigerBoard initialization settings:
30489660e442SHelmut Raiger------------------------------
30499660e442SHelmut Raiger
30509660e442SHelmut RaigerDuring Initialization u-boot calls a number of board specific functions
30519660e442SHelmut Raigerto allow the preparation of board specific prerequisites, e.g. pin setup
30529660e442SHelmut Raigerbefore drivers are initialized. To enable these callbacks the
30539660e442SHelmut Raigerfollowing configuration macros have to be defined. Currently this is
30549660e442SHelmut Raigerarchitecture specific, so please check arch/your_architecture/lib/board.c
30559660e442SHelmut Raigertypically in board_init_f() and board_init_r().
30569660e442SHelmut Raiger
30579660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_F: Call board_early_init_f()
30589660e442SHelmut Raiger- CONFIG_BOARD_EARLY_INIT_R: Call board_early_init_r()
30599660e442SHelmut Raiger- CONFIG_BOARD_LATE_INIT: Call board_late_init()
30609660e442SHelmut Raiger- CONFIG_BOARD_POSTCLK_INIT: Call board_postclk_init()
3061c609719bSwdenk
3062c609719bSwdenkConfiguration Settings:
3063c609719bSwdenk-----------------------
3064c609719bSwdenk
30656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included;
3066c609719bSwdenk		undefine this when you're short of memory.
3067c609719bSwdenk
30682fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default
30692fb2604dSPeter Tyser		width of the commands listed in the 'help' command output.
30702fb2604dSPeter Tyser
30716d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT:	This is what U-Boot prints on the console to
3072c609719bSwdenk		prompt for user input.
3073c609719bSwdenk
30746d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE:	Buffer size for input from the Console
3075c609719bSwdenk
30766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE:	Buffer size for Console output
3077c609719bSwdenk
30786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS:	max. Number of arguments accepted for monitor commands
3079c609719bSwdenk
30806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to
3081c609719bSwdenk		the application (usually a Linux kernel) when it is
3082c609719bSwdenk		booted
3083c609719bSwdenk
30846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE:
3085c609719bSwdenk		List of legal baudrate settings for this board.
3086c609719bSwdenk
30876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET
3088c609719bSwdenk		Suppress display of console information at boot.
3089c609719bSwdenk
30906d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV
3091c609719bSwdenk		If the board specific function
3092c609719bSwdenk			extern int overwrite_console (void);
3093c609719bSwdenk		returns 1, the stdin, stderr and stdout are switched to the
3094c609719bSwdenk		serial port, else the settings in the environment are used.
3095c609719bSwdenk
30966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
3097c609719bSwdenk		Enable the call to overwrite_console().
3098c609719bSwdenk
30996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE
3100c609719bSwdenk		Enable overwrite of previous console environment settings.
3101c609719bSwdenk
31026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
3103c609719bSwdenk		Begin and End addresses of the area used by the
3104c609719bSwdenk		simple memory test.
3105c609719bSwdenk
31066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST:
3107c609719bSwdenk		Enable an alternate, more extensive memory test.
3108c609719bSwdenk
31096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH:
31105f535fe1Swdenk		Scratch address used by the alternate memory test
31115f535fe1Swdenk		You only need to set this if address zero isn't writeable
31125f535fe1Swdenk
31136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only):
31146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header,
311514f73ca6SStefan Roese		this specified memory area will get subtracted from the top
311611ccc33fSMarcel Ziswiler		(end) of RAM and won't get "touched" at all by U-Boot. By
311714f73ca6SStefan Roese		fixing up gd->ram_size the Linux kernel should gets passed
311814f73ca6SStefan Roese		the now "corrected" memory size and won't touch it either.
311914f73ca6SStefan Roese		This should work for arch/ppc and arch/powerpc. Only Linux
31205e12e75dSStefan Roese		board ports in arch/powerpc with bootwrapper support that
312114f73ca6SStefan Roese		recalculate the memory size from the SDRAM controller setup
31225e12e75dSStefan Roese		will have to get fixed in Linux additionally.
312314f73ca6SStefan Roese
312414f73ca6SStefan Roese		This option can be used as a workaround for the 440EPx/GRx
312514f73ca6SStefan Roese		CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
312614f73ca6SStefan Roese		be touched.
312714f73ca6SStefan Roese
312814f73ca6SStefan Roese		WARNING: Please make sure that this value is a multiple of
312914f73ca6SStefan Roese		the Linux page size (normally 4k). If this is not the case,
313014f73ca6SStefan Roese		then the end address of the Linux memory will be located at a
313114f73ca6SStefan Roese		non page size aligned address and this could cause major
313214f73ca6SStefan Roese		problems.
313314f73ca6SStefan Roese
31346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE:
3135c609719bSwdenk		Enable temporary baudrate change while serial download
3136c609719bSwdenk
31376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE:
3138c609719bSwdenk		Physical start address of SDRAM. _Must_ be 0 here.
3139c609719bSwdenk
31406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE:
3141c609719bSwdenk		Physical start address of Motherboard I/O (if using a
3142c609719bSwdenk		Cogent motherboard)
3143c609719bSwdenk
31446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE:
3145c609719bSwdenk		Physical start address of Flash memory.
3146c609719bSwdenk
31476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE:
3148c609719bSwdenk		Physical start address of boot monitor code (set by
3149c609719bSwdenk		make config files to be same as the text base address
315014d0a02aSWolfgang Denk		(CONFIG_SYS_TEXT_BASE) used when linking) - same as
31516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FLASH_BASE when booting from flash.
3152c609719bSwdenk
31536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN:
31543b57fe0aSwdenk		Size of memory reserved for monitor code, used to
31553b57fe0aSwdenk		determine _at_compile_time_ (!) if the environment is
31563b57fe0aSwdenk		embedded within the U-Boot image, or in a separate
31573b57fe0aSwdenk		flash sector.
3158c609719bSwdenk
31596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN:
3160c609719bSwdenk		Size of DRAM reserved for malloc() use.
3161c609719bSwdenk
31626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN:
316315940c9aSStefan Roese		Normally compressed uImages are limited to an
316415940c9aSStefan Roese		uncompressed size of 8 MBytes. If this is not enough,
31656d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		you can define CONFIG_SYS_BOOTM_LEN in your board config file
316615940c9aSStefan Roese		to adjust this setting to your needs.
3167c609719bSwdenk
31686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ:
3169c609719bSwdenk		Maximum size of memory mapped by the startup code of
3170c609719bSwdenk		the Linux kernel; all data that must be processed by
31717d721e34SBartlomiej Sieka		the Linux kernel (bd_info, boot arguments, FDT blob if
31727d721e34SBartlomiej Sieka		used) must be put below this limit, unless "bootm_low"
31737d721e34SBartlomiej Sieka		enviroment variable is defined and non-zero. In such case
31747d721e34SBartlomiej Sieka		all data for the Linux kernel must be between "bootm_low"
3175c3624e6eSGrant Likely		and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.	 The environment
3176c3624e6eSGrant Likely		variable "bootm_mapsize" will override the value of
3177c3624e6eSGrant Likely		CONFIG_SYS_BOOTMAPSZ.  If CONFIG_SYS_BOOTMAPSZ is undefined,
3178c3624e6eSGrant Likely		then the value in "bootm_size" will be used instead.
3179c609719bSwdenk
3180fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH:
3181fca43cc8SJohn Rigby		Enable initrd_high functionality.  If defined then the
3182fca43cc8SJohn Rigby		initrd_high feature is enabled and the bootm ramdisk subcommand
3183fca43cc8SJohn Rigby		is enabled.
3184fca43cc8SJohn Rigby
3185fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE:
3186fca43cc8SJohn Rigby		Enables allocating and saving kernel cmdline in space between
3187fca43cc8SJohn Rigby		"bootm_low" and "bootm_low" + BOOTMAPSZ.
3188fca43cc8SJohn Rigby
3189fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD:
3190fca43cc8SJohn Rigby		Enables allocating and saving a kernel copy of the bd_info in
3191fca43cc8SJohn Rigby		space between "bootm_low" and "bootm_low" + BOOTMAPSZ.
3192fca43cc8SJohn Rigby
31936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS:
3194c609719bSwdenk		Max number of Flash memory banks
3195c609719bSwdenk
31966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT:
3197c609719bSwdenk		Max number of sectors on a Flash chip
3198c609719bSwdenk
31996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT:
3200c609719bSwdenk		Timeout for Flash erase operations (in ms)
3201c609719bSwdenk
32026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT:
3203c609719bSwdenk		Timeout for Flash write operations (in ms)
3204c609719bSwdenk
32056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT
32068564acf9Swdenk		Timeout for Flash set sector lock bit operation (in ms)
32078564acf9Swdenk
32086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT
32098564acf9Swdenk		Timeout for Flash clear lock bits operation (in ms)
32108564acf9Swdenk
32116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION
32128564acf9Swdenk		If defined, hardware flash sectors protection is used
32138564acf9Swdenk		instead of U-Boot software protection.
32148564acf9Swdenk
32156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP:
3216c609719bSwdenk
3217c609719bSwdenk		Enable TFTP transfers directly to flash memory;
3218c609719bSwdenk		without this option such a download has to be
3219c609719bSwdenk		performed in two steps: (1) download to RAM, and (2)
3220c609719bSwdenk		copy from RAM to flash.
3221c609719bSwdenk
3222c609719bSwdenk		The two-step approach is usually more reliable, since
3223c609719bSwdenk		you can check if the download worked before you erase
322411ccc33fSMarcel Ziswiler		the flash, but in some situations (when system RAM is
322511ccc33fSMarcel Ziswiler		too limited to allow for a temporary copy of the
3226c609719bSwdenk		downloaded image) this option may be very useful.
3227c609719bSwdenk
32286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI:
3229c609719bSwdenk		Define if the flash driver uses extra elements in the
32305653fc33Swdenk		common flash structure for storing flash geometry.
32315653fc33Swdenk
323200b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER
32335653fc33Swdenk		This option also enables the building of the cfi_flash driver
32345653fc33Swdenk		in the drivers directory
323553cf9435Sstroese
323691809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD
323791809ed5SPiotr Ziecik		This option enables the building of the cfi_mtd driver
323891809ed5SPiotr Ziecik		in the drivers directory. The driver exports CFI flash
323991809ed5SPiotr Ziecik		to the MTD layer.
324091809ed5SPiotr Ziecik
32416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE
324296ef831fSGuennadi Liakhovetski		Use buffered writes to flash.
324396ef831fSGuennadi Liakhovetski
324496ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N
324596ef831fSGuennadi Liakhovetski		s29ws-n MirrorBit flash has non-standard addresses for buffered
324696ef831fSGuennadi Liakhovetski		write commands.
324796ef831fSGuennadi Liakhovetski
32486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST
32495568e613SStefan Roese		If this option is defined, the common CFI flash doesn't
32505568e613SStefan Roese		print it's warning upon not recognized FLASH banks. This
32515568e613SStefan Roese		is useful, if some of the configured banks are only
32525568e613SStefan Roese		optionally available.
32535568e613SStefan Roese
32549a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS
32559a042e9cSJerry Van Baren		If defined (must be an integer), print out countdown
32569a042e9cSJerry Van Baren		digits and dots.  Recommended value: 45 (9..1) for 80
32579a042e9cSJerry Van Baren		column displays, 15 (3..1) for 40 column displays.
32589a042e9cSJerry Van Baren
3259352ef3f1SStefan Roese- CONFIG_FLASH_VERIFY
3260352ef3f1SStefan Roese		If defined, the content of the flash (destination) is compared
3261352ef3f1SStefan Roese		against the source after the write operation. An error message
3262352ef3f1SStefan Roese		will be printed when the contents are not identical.
3263352ef3f1SStefan Roese		Please note that this option is useless in nearly all cases,
3264352ef3f1SStefan Roese		since such flash programming errors usually are detected earlier
3265352ef3f1SStefan Roese		while unprotecting/erasing/programming. Please only enable
3266352ef3f1SStefan Roese		this option if you really know what you are doing.
3267352ef3f1SStefan Roese
32686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER:
326911ccc33fSMarcel Ziswiler		Defines the number of Ethernet receive buffers. On some
327011ccc33fSMarcel Ziswiler		Ethernet controllers it is recommended to set this value
327153cf9435Sstroese		to 8 or even higher (EEPRO100 or 405 EMAC), since all
327253cf9435Sstroese		buffers can be full shortly after enabling the interface
327311ccc33fSMarcel Ziswiler		on high Ethernet traffic.
327453cf9435Sstroese		Defaults to 4 if not defined.
3275c609719bSwdenk
3276ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES
3277ea882bafSWolfgang Denk
3278ea882bafSWolfgang Denk	Maximum number of entries in the hash table that is used
3279ea882bafSWolfgang Denk	internally to store the environment settings. The default
3280ea882bafSWolfgang Denk	setting is supposed to be generous and should work in most
3281ea882bafSWolfgang Denk	cases. This setting can be used to tune behaviour; see
3282ea882bafSWolfgang Denk	lib/hashtable.c for details.
3283ea882bafSWolfgang Denk
32842598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_DEFAULT
32852598090bSJoe Hershberger- CONFIG_ENV_FLAGS_LIST_STATIC
32862598090bSJoe Hershberger	Enable validation of the values given to enviroment variables when
32872598090bSJoe Hershberger	calling env set.  Variables can be restricted to only decimal,
32882598090bSJoe Hershberger	hexadecimal, or boolean.  If CONFIG_CMD_NET is also defined,
32892598090bSJoe Hershberger	the variables can also be restricted to IP address or MAC address.
32902598090bSJoe Hershberger
32912598090bSJoe Hershberger	The format of the list is:
32922598090bSJoe Hershberger		type_attribute = [s|d|x|b|i|m]
3293267541f7SJoe Hershberger		access_atribute = [a|r|o|c]
3294267541f7SJoe Hershberger		attributes = type_attribute[access_atribute]
32952598090bSJoe Hershberger		entry = variable_name[:attributes]
32962598090bSJoe Hershberger		list = entry[,list]
32972598090bSJoe Hershberger
32982598090bSJoe Hershberger	The type attributes are:
32992598090bSJoe Hershberger		s - String (default)
33002598090bSJoe Hershberger		d - Decimal
33012598090bSJoe Hershberger		x - Hexadecimal
33022598090bSJoe Hershberger		b - Boolean ([1yYtT|0nNfF])
33032598090bSJoe Hershberger		i - IP address
33042598090bSJoe Hershberger		m - MAC address
33052598090bSJoe Hershberger
3306267541f7SJoe Hershberger	The access attributes are:
3307267541f7SJoe Hershberger		a - Any (default)
3308267541f7SJoe Hershberger		r - Read-only
3309267541f7SJoe Hershberger		o - Write-once
3310267541f7SJoe Hershberger		c - Change-default
3311267541f7SJoe Hershberger
33122598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_DEFAULT
33132598090bSJoe Hershberger		Define this to a list (string) to define the ".flags"
33142598090bSJoe Hershberger		envirnoment variable in the default or embedded environment.
33152598090bSJoe Hershberger
33162598090bSJoe Hershberger	- CONFIG_ENV_FLAGS_LIST_STATIC
33172598090bSJoe Hershberger		Define this to a list (string) to define validation that
33182598090bSJoe Hershberger		should be done if an entry is not found in the ".flags"
33192598090bSJoe Hershberger		environment variable.  To override a setting in the static
33202598090bSJoe Hershberger		list, simply add an entry for the same variable name to the
33212598090bSJoe Hershberger		".flags" variable.
33222598090bSJoe Hershberger
3323267541f7SJoe Hershberger- CONFIG_ENV_ACCESS_IGNORE_FORCE
3324267541f7SJoe Hershberger	If defined, don't allow the -f switch to env set override variable
3325267541f7SJoe Hershberger	access flags.
3326267541f7SJoe Hershberger
33275c1a7ea6SSimon Glass- CONFIG_SYS_GENERIC_BOARD
33285c1a7ea6SSimon Glass	This selects the architecture-generic board system instead of the
33295c1a7ea6SSimon Glass	architecture-specific board files. It is intended to move boards
33305c1a7ea6SSimon Glass	to this new framework over time. Defining this will disable the
33315c1a7ea6SSimon Glass	arch/foo/lib/board.c file and use common/board_f.c and
33325c1a7ea6SSimon Glass	common/board_r.c instead. To use this option your architecture
33335c1a7ea6SSimon Glass	must support it (i.e. must define __HAVE_ARCH_GENERIC_BOARD in
33345c1a7ea6SSimon Glass	its config.mk file). If you find problems enabling this option on
33355c1a7ea6SSimon Glass	your board please report the problem and send patches!
33365c1a7ea6SSimon Glass
3337632efa74SSimon Glass- CONFIG_SYS_SYM_OFFSETS
3338632efa74SSimon Glass	This is set by architectures that use offsets for link symbols
3339632efa74SSimon Glass	instead of absolute values. So bss_start is obtained using an
3340632efa74SSimon Glass	offset _bss_start_ofs from CONFIG_SYS_TEXT_BASE, rather than
3341632efa74SSimon Glass	directly. You should not need to touch this setting.
3342632efa74SSimon Glass
3343632efa74SSimon Glass
3344c609719bSwdenkThe following definitions that deal with the placement and management
3345c609719bSwdenkof environment data (variable area); in general, we support the
3346c609719bSwdenkfollowing configurations:
3347c609719bSwdenk
3348c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC:
3349c3eb3fe4SMike Frysinger
3350c3eb3fe4SMike Frysinger	Builds up envcrc with the target environment so that external utils
3351c3eb3fe4SMike Frysinger	may easily extract it and embed it in final U-Boot images.
3352c3eb3fe4SMike Frysinger
33535a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH:
3354c609719bSwdenk
3355c609719bSwdenk	Define this if the environment is in flash memory.
3356c609719bSwdenk
3357c609719bSwdenk	a) The environment occupies one whole flash sector, which is
3358c609719bSwdenk	   "embedded" in the text segment with the U-Boot code. This
3359c609719bSwdenk	   happens usually with "bottom boot sector" or "top boot
3360c609719bSwdenk	   sector" type flash chips, which have several smaller
3361c609719bSwdenk	   sectors at the start or the end. For instance, such a
3362c609719bSwdenk	   layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In
3363c609719bSwdenk	   such a case you would place the environment in one of the
3364c609719bSwdenk	   4 kB sectors - with U-Boot code before and after it. With
3365c609719bSwdenk	   "top boot sector" type flash chips, you would put the
3366c609719bSwdenk	   environment in one of the last sectors, leaving a gap
3367c609719bSwdenk	   between U-Boot and the environment.
3368c609719bSwdenk
33690e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
3370c609719bSwdenk
3371c609719bSwdenk	   Offset of environment data (variable area) to the
3372c609719bSwdenk	   beginning of flash memory; for instance, with bottom boot
3373c609719bSwdenk	   type flash chips the second sector can be used: the offset
3374c609719bSwdenk	   for this sector is given here.
3375c609719bSwdenk
33766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE.
3377c609719bSwdenk
33780e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
3379c609719bSwdenk
3380c609719bSwdenk	   This is just another way to specify the start address of
3381c609719bSwdenk	   the flash sector containing the environment (instead of
33820e8d1586SJean-Christophe PLAGNIOL-VILLARD	   CONFIG_ENV_OFFSET).
3383c609719bSwdenk
33840e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SECT_SIZE:
3385c609719bSwdenk
3386c609719bSwdenk	   Size of the sector containing the environment.
3387c609719bSwdenk
3388c609719bSwdenk
3389c609719bSwdenk	b) Sometimes flash chips have few, equal sized, BIG sectors.
3390c609719bSwdenk	   In such a case you don't want to spend a whole sector for
3391c609719bSwdenk	   the environment.
3392c609719bSwdenk
33930e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3394c609719bSwdenk
33955a1aceb0SJean-Christophe PLAGNIOL-VILLARD	   If you use this in combination with CONFIG_ENV_IS_IN_FLASH
33960e8d1586SJean-Christophe PLAGNIOL-VILLARD	   and CONFIG_ENV_SECT_SIZE, you can specify to use only a part
3397c609719bSwdenk	   of this flash sector for the environment. This saves
3398c609719bSwdenk	   memory for the RAM copy of the environment.
3399c609719bSwdenk
3400c609719bSwdenk	   It may also save flash memory if you decide to use this
3401c609719bSwdenk	   when your environment is "embedded" within U-Boot code,
3402c609719bSwdenk	   since then the remainder of the flash sector could be used
3403c609719bSwdenk	   for U-Boot code. It should be pointed out that this is
3404c609719bSwdenk	   STRONGLY DISCOURAGED from a robustness point of view:
3405c609719bSwdenk	   updating the environment in flash makes it always
3406c609719bSwdenk	   necessary to erase the WHOLE sector. If something goes
3407c609719bSwdenk	   wrong before the contents has been restored from a copy in
3408c609719bSwdenk	   RAM, your target system will be dead.
3409c609719bSwdenk
34100e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR_REDUND
34110e8d1586SJean-Christophe PLAGNIOL-VILLARD	  CONFIG_ENV_SIZE_REDUND
3412c609719bSwdenk
3413c609719bSwdenk	   These settings describe a second storage area used to hold
341411ccc33fSMarcel Ziswiler	   a redundant copy of the environment data, so that there is
34153e38691eSwdenk	   a valid backup copy in case there is a power failure during
3416c609719bSwdenk	   a "saveenv" operation.
3417c609719bSwdenk
3418c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the
3419c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds*
3420c609719bSwdenkaccordingly!
3421c609719bSwdenk
3422c609719bSwdenk
34239314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM:
3424c609719bSwdenk
3425c609719bSwdenk	Define this if you have some non-volatile memory device
3426c609719bSwdenk	(NVRAM, battery buffered SRAM) which you want to use for the
3427c609719bSwdenk	environment.
3428c609719bSwdenk
34290e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
34300e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3431c609719bSwdenk
343211ccc33fSMarcel Ziswiler	  These two #defines are used to determine the memory area you
3433c609719bSwdenk	  want to use for environment. It is assumed that this memory
3434c609719bSwdenk	  can just be read and written to, without any special
3435c609719bSwdenk	  provision.
3436c609719bSwdenk
3437c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early
3438c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the
343911ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or
3440c609719bSwdenkU-Boot will hang.
3441c609719bSwdenk
3442c609719bSwdenkPlease note that even with NVRAM we still use a copy of the
3443c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to
3444c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv"
3445c609719bSwdenkto save the current settings.
3446c609719bSwdenk
3447c609719bSwdenk
3448bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM:
3449c609719bSwdenk
3450c609719bSwdenk	Use this if you have an EEPROM or similar serial access
3451c609719bSwdenk	device and a driver for it.
3452c609719bSwdenk
34530e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
34540e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
3455c609719bSwdenk
3456c609719bSwdenk	  These two #defines specify the offset and size of the
3457c609719bSwdenk	  environment area within the total memory of your EEPROM.
3458c609719bSwdenk
34596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR:
3460c609719bSwdenk	  If defined, specified the chip address of the EEPROM device.
3461c609719bSwdenk	  The default address is zero.
3462c609719bSwdenk
34636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_BITS:
3464c609719bSwdenk	  If defined, the number of bits used to address bytes in a
3465c609719bSwdenk	  single page in the EEPROM device.  A 64 byte page, for example
3466c609719bSwdenk	  would require six bits.
3467c609719bSwdenk
34686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS:
3469c609719bSwdenk	  If defined, the number of milliseconds to delay between
3470c609719bSwdenk	  page writes.	The default is zero milliseconds.
3471c609719bSwdenk
34726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_LEN:
3473c609719bSwdenk	  The length in bytes of the EEPROM memory array address.  Note
3474c609719bSwdenk	  that this is NOT the chip address length!
3475c609719bSwdenk
34766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW:
34775cf91d6bSwdenk	  EEPROM chips that implement "address overflow" are ones
34785cf91d6bSwdenk	  like Catalyst 24WC04/08/16 which has 9/10/11 bits of
34795cf91d6bSwdenk	  address and the extra bits end up in the "chip address" bit
34805cf91d6bSwdenk	  slots. This makes a 24WC08 (1Kbyte) chip look like four 256
34815cf91d6bSwdenk	  byte chips.
34825cf91d6bSwdenk
34835cf91d6bSwdenk	  Note that we consider the length of the address field to
34845cf91d6bSwdenk	  still be one byte because the extra address bits are hidden
34855cf91d6bSwdenk	  in the chip address.
34865cf91d6bSwdenk
34876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	- CONFIG_SYS_EEPROM_SIZE:
3488c609719bSwdenk	  The size in bytes of the EEPROM device.
3489c609719bSwdenk
3490548738b4SHeiko Schocher	- CONFIG_ENV_EEPROM_IS_ON_I2C
3491548738b4SHeiko Schocher	  define this, if you have I2C and SPI activated, and your
3492548738b4SHeiko Schocher	  EEPROM, which holds the environment, is on the I2C bus.
3493548738b4SHeiko Schocher
3494548738b4SHeiko Schocher	- CONFIG_I2C_ENV_EEPROM_BUS
3495548738b4SHeiko Schocher	  if you have an Environment on an EEPROM reached over
3496548738b4SHeiko Schocher	  I2C muxes, you can define here, how to reach this
3497548738b4SHeiko Schocher	  EEPROM. For example:
3498548738b4SHeiko Schocher
3499548738b4SHeiko Schocher	  #define CONFIG_I2C_ENV_EEPROM_BUS	  "pca9547:70:d\0"
3500548738b4SHeiko Schocher
3501548738b4SHeiko Schocher	  EEPROM which holds the environment, is reached over
3502548738b4SHeiko Schocher	  a pca9547 i2c mux with address 0x70, channel 3.
3503c609719bSwdenk
3504057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH:
35055779d8d9Swdenk
35065779d8d9Swdenk	Define this if you have a DataFlash memory device which you
35075779d8d9Swdenk	want to use for the environment.
35085779d8d9Swdenk
35090e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
35100e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_ADDR:
35110e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
35125779d8d9Swdenk
35135779d8d9Swdenk	  These three #defines specify the offset and size of the
35145779d8d9Swdenk	  environment area within the total memory of your DataFlash placed
35155779d8d9Swdenk	  at the specified address.
35165779d8d9Swdenk
35170a85a9e7SLiu Gang- CONFIG_ENV_IS_IN_REMOTE:
35180a85a9e7SLiu Gang
35190a85a9e7SLiu Gang	Define this if you have a remote memory space which you
35200a85a9e7SLiu Gang	want to use for the local device's environment.
35210a85a9e7SLiu Gang
35220a85a9e7SLiu Gang	- CONFIG_ENV_ADDR:
35230a85a9e7SLiu Gang	- CONFIG_ENV_SIZE:
35240a85a9e7SLiu Gang
35250a85a9e7SLiu Gang	  These two #defines specify the address and size of the
35260a85a9e7SLiu Gang	  environment area within the remote memory space. The
35270a85a9e7SLiu Gang	  local device can get the environment from remote memory
3528fc54c7faSLiu Gang	  space by SRIO or PCIE links.
35290a85a9e7SLiu Gang
35300a85a9e7SLiu GangBE CAREFUL! For some special cases, the local device can not use
35310a85a9e7SLiu Gang"saveenv" command. For example, the local device will get the
3532fc54c7faSLiu Gangenvironment stored in a remote NOR flash by SRIO or PCIE link,
3533fc54c7faSLiu Gangbut it can not erase, write this NOR flash by SRIO or PCIE interface.
35340a85a9e7SLiu Gang
353551bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND:
353613a5695bSwdenk
353713a5695bSwdenk	Define this if you have a NAND device which you want to use
353813a5695bSwdenk	for the environment.
353913a5695bSwdenk
35400e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_OFFSET:
35410e8d1586SJean-Christophe PLAGNIOL-VILLARD	- CONFIG_ENV_SIZE:
354213a5695bSwdenk
354313a5695bSwdenk	  These two #defines specify the offset and size of the environment
3544fdd813deSScott Wood	  area within the first NAND device.  CONFIG_ENV_OFFSET must be
3545fdd813deSScott Wood	  aligned to an erase block boundary.
35465779d8d9Swdenk
3547fdd813deSScott Wood	- CONFIG_ENV_OFFSET_REDUND (optional):
3548e443c944SMarkus Klotzbuecher
35490e8d1586SJean-Christophe PLAGNIOL-VILLARD	  This setting describes a second storage area of CONFIG_ENV_SIZE
3550fdd813deSScott Wood	  size used to hold a redundant copy of the environment data, so
3551fdd813deSScott Wood	  that there is a valid backup copy in case there is a power failure
3552fdd813deSScott Wood	  during a "saveenv" operation.	 CONFIG_ENV_OFFSET_RENDUND must be
3553fdd813deSScott Wood	  aligned to an erase block boundary.
3554e443c944SMarkus Klotzbuecher
3555fdd813deSScott Wood	- CONFIG_ENV_RANGE (optional):
3556fdd813deSScott Wood
3557fdd813deSScott Wood	  Specifies the length of the region in which the environment
3558fdd813deSScott Wood	  can be written.  This should be a multiple of the NAND device's
3559fdd813deSScott Wood	  block size.  Specifying a range with more erase blocks than
3560fdd813deSScott Wood	  are needed to hold CONFIG_ENV_SIZE allows bad blocks within
3561fdd813deSScott Wood	  the range to be avoided.
3562fdd813deSScott Wood
3563fdd813deSScott Wood	- CONFIG_ENV_OFFSET_OOB (optional):
3564fdd813deSScott Wood
3565fdd813deSScott Wood	  Enables support for dynamically retrieving the offset of the
3566fdd813deSScott Wood	  environment from block zero's out-of-band data.  The
3567fdd813deSScott Wood	  "nand env.oob" command can be used to record this offset.
3568fdd813deSScott Wood	  Currently, CONFIG_ENV_OFFSET_REDUND is not supported when
3569fdd813deSScott Wood	  using CONFIG_ENV_OFFSET_OOB.
3570e443c944SMarkus Klotzbuecher
3571b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST
3572b74ab737SGuennadi Liakhovetski
3573b74ab737SGuennadi Liakhovetski	Defines address in RAM to which the nand_spl code should copy the
3574b74ab737SGuennadi Liakhovetski	environment. If redundant environment is used, it will be copied to
3575b74ab737SGuennadi Liakhovetski	CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE.
3576b74ab737SGuennadi Liakhovetski
35772b74433fSJoe Hershberger- CONFIG_ENV_IS_IN_UBI:
35782b74433fSJoe Hershberger
35792b74433fSJoe Hershberger	Define this if you have an UBI volume that you want to use for the
35802b74433fSJoe Hershberger	environment.  This has the benefit of wear-leveling the environment
35812b74433fSJoe Hershberger	accesses, which is important on NAND.
35822b74433fSJoe Hershberger
35832b74433fSJoe Hershberger	- CONFIG_ENV_UBI_PART:
35842b74433fSJoe Hershberger
35852b74433fSJoe Hershberger	  Define this to a string that is the mtd partition containing the UBI.
35862b74433fSJoe Hershberger
35872b74433fSJoe Hershberger	- CONFIG_ENV_UBI_VOLUME:
35882b74433fSJoe Hershberger
35892b74433fSJoe Hershberger	  Define this to the name of the volume that you want to store the
35902b74433fSJoe Hershberger	  environment in.
35912b74433fSJoe Hershberger
3592785881f7SJoe Hershberger	- CONFIG_ENV_UBI_VOLUME_REDUND:
3593785881f7SJoe Hershberger
3594785881f7SJoe Hershberger	  Define this to the name of another volume to store a second copy of
3595785881f7SJoe Hershberger	  the environment in.  This will enable redundant environments in UBI.
3596785881f7SJoe Hershberger	  It is assumed that both volumes are in the same MTD partition.
3597785881f7SJoe Hershberger
35982b74433fSJoe Hershberger	- CONFIG_UBI_SILENCE_MSG
35992b74433fSJoe Hershberger	- CONFIG_UBIFS_SILENCE_MSG
36002b74433fSJoe Hershberger
36012b74433fSJoe Hershberger	  You will probably want to define these to avoid a really noisy system
36022b74433fSJoe Hershberger	  when storing the env in UBI.
36032b74433fSJoe Hershberger
36046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET
3605c609719bSwdenk
3606c609719bSwdenk	Defines offset to the initial SPI buffer area in DPRAM. The
3607c609719bSwdenk	area is used at an early stage (ROM part) if the environment
3608c609719bSwdenk	is configured to reside in the SPI EEPROM: We need a 520 byte
3609c609719bSwdenk	scratch DPRAM area. It is used between the two initialization
3610c609719bSwdenk	calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems
3611c609719bSwdenk	to be a good choice since it makes it far enough from the
3612c609719bSwdenk	start of the data area as well as from the stack pointer.
3613c609719bSwdenk
3614e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor
3615c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been
3616cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f()
3617c609719bSwdenkuntil then to read environment variables.
3618c609719bSwdenk
361985ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor
362085ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working
362185ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is
362285ec0bccSwdenknecessary, because the first environment variable we need is the
362385ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't
362485ec0bccSwdenkhave any device yet where we could complain.]
3625c609719bSwdenk
3626c609719bSwdenkNote: once the monitor has been relocated, then it will complain if
3627c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you
362885ec0bccSwdenkuse the "saveenv" command to store a valid environment.
3629c609719bSwdenk
36306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN:
3631fc3e2165Swdenk		Echo the inverted Ethernet link state to the fault LED.
3632fc3e2165Swdenk
36336d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR
3634fc3e2165Swdenk		      also needs to be defined.
3635fc3e2165Swdenk
36366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR:
3637fc3e2165Swdenk		MII address of the PHY to check for the Ethernet link state.
3638c609719bSwdenk
3639f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS:
3640f5675aa5SRon Madrid		Define this if you desire to only have use of the NS16550_init
3641f5675aa5SRon Madrid		and NS16550_putc functions for the serial driver located at
3642f5675aa5SRon Madrid		drivers/serial/ns16550.c.  This option is useful for saving
3643f5675aa5SRon Madrid		space for already greatly restricted images, including but not
3644f5675aa5SRon Madrid		limited to NAND_SPL configurations.
3645f5675aa5SRon Madrid
3646b2b92f53SSimon Glass- CONFIG_DISPLAY_BOARDINFO
3647b2b92f53SSimon Glass		Display information about the board that U-Boot is running on
3648b2b92f53SSimon Glass		when U-Boot starts up. The board function checkboard() is called
3649b2b92f53SSimon Glass		to do this.
3650b2b92f53SSimon Glass
3651e2e3e2b1SSimon Glass- CONFIG_DISPLAY_BOARDINFO_LATE
3652e2e3e2b1SSimon Glass		Similar to the previous option, but display this information
3653e2e3e2b1SSimon Glass		later, once stdio is running and output goes to the LCD, if
3654e2e3e2b1SSimon Glass		present.
3655e2e3e2b1SSimon Glass
3656c609719bSwdenkLow Level (hardware related) configuration options:
3657dc7c9a1aSwdenk---------------------------------------------------
3658c609719bSwdenk
36596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE:
3660c609719bSwdenk		Cache Line Size of the CPU.
3661c609719bSwdenk
36626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR:
3663c609719bSwdenk		Default address of the IMMR after system reset.
36642535d602Swdenk
36652535d602Swdenk		Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU,
36662535d602Swdenk		and RPXsuper) to be able to adjust the position of
36672535d602Swdenk		the IMMR register after a reset.
3668c609719bSwdenk
3669e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT:
3670e46fedfeSTimur Tabi		Default (power-on reset) physical address of CCSR on Freescale
3671e46fedfeSTimur Tabi		PowerPC SOCs.
3672e46fedfeSTimur Tabi
3673e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR:
3674e46fedfeSTimur Tabi		Virtual address of CCSR.  On a 32-bit build, this is typically
3675e46fedfeSTimur Tabi		the same value as CONFIG_SYS_CCSRBAR_DEFAULT.
3676e46fedfeSTimur Tabi
3677e46fedfeSTimur Tabi		CONFIG_SYS_DEFAULT_IMMR must also be set to this value,
3678e46fedfeSTimur Tabi		for cross-platform code that uses that macro instead.
3679e46fedfeSTimur Tabi
3680e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS:
3681e46fedfeSTimur Tabi		Physical address of CCSR.  CCSR can be relocated to a new
3682e46fedfeSTimur Tabi		physical address, if desired.  In this case, this macro should
3683e46fedfeSTimur Tabi		be set to that address.	 Otherwise, it should be set to the
3684e46fedfeSTimur Tabi		same value as CONFIG_SYS_CCSRBAR_DEFAULT.  For example, CCSR
3685e46fedfeSTimur Tabi		is typically relocated on 36-bit builds.  It is recommended
3686e46fedfeSTimur Tabi		that this macro be defined via the _HIGH and _LOW macros:
3687e46fedfeSTimur Tabi
3688e46fedfeSTimur Tabi		#define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH
3689e46fedfeSTimur Tabi			* 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW)
3690e46fedfeSTimur Tabi
3691e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH:
3692e46fedfeSTimur Tabi		Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS.	This value is typically
3693e46fedfeSTimur Tabi		either 0 (32-bit build) or 0xF (36-bit build).	This macro is
3694e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3695e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3696e46fedfeSTimur Tabi
3697e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW:
3698e46fedfeSTimur Tabi		Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS.  This macro is
3699e46fedfeSTimur Tabi		used in assembly code, so it must not contain typecasts or
3700e46fedfeSTimur Tabi		integer size suffixes (e.g. "ULL").
3701e46fedfeSTimur Tabi
3702e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE:
3703e46fedfeSTimur Tabi		If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be
3704e46fedfeSTimur Tabi		forced to a value that ensures that CCSR is not relocated.
3705e46fedfeSTimur Tabi
37067f6c2cbcSwdenk- Floppy Disk Support:
37076d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER
37087f6c2cbcSwdenk
37097f6c2cbcSwdenk		the default drive number (default value 0)
37107f6c2cbcSwdenk
37116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_STRIDE
37127f6c2cbcSwdenk
371311ccc33fSMarcel Ziswiler		defines the spacing between FDC chipset registers
37147f6c2cbcSwdenk		(default value 1)
37157f6c2cbcSwdenk
37166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_ISA_IO_OFFSET
37177f6c2cbcSwdenk
37187f6c2cbcSwdenk		defines the offset of register from address. It
37197f6c2cbcSwdenk		depends on which part of the data bus is connected to
372011ccc33fSMarcel Ziswiler		the FDC chipset. (default value 0)
37217f6c2cbcSwdenk
37226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and
37236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their
37247f6c2cbcSwdenk		default value.
37257f6c2cbcSwdenk
37266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		if CONFIG_SYS_FDC_HW_INIT is defined, then the function
37277f6c2cbcSwdenk		fdc_hw_init() is called at the beginning of the FDC
37287f6c2cbcSwdenk		setup. fdc_hw_init() must be provided by the board
37297f6c2cbcSwdenk		source code. It is used to make hardware dependant
37307f6c2cbcSwdenk		initializations.
37317f6c2cbcSwdenk
37320abddf82SMacpaul Lin- CONFIG_IDE_AHB:
37330abddf82SMacpaul Lin		Most IDE controllers were designed to be connected with PCI
37340abddf82SMacpaul Lin		interface. Only few of them were designed for AHB interface.
37350abddf82SMacpaul Lin		When software is doing ATA command and data transfer to
37360abddf82SMacpaul Lin		IDE devices through IDE-AHB controller, some additional
37370abddf82SMacpaul Lin		registers accessing to these kind of IDE-AHB controller
37380abddf82SMacpaul Lin		is requierd.
37390abddf82SMacpaul Lin
37406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR:	Physical address of the Internal Memory.
374125d6712aSwdenk		DO NOT CHANGE unless you know exactly what you're
374225d6712aSwdenk		doing! (11-4) [MPC8xx/82xx systems only]
3743c609719bSwdenk
37446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR:
3745c609719bSwdenk
37467152b1d0Swdenk		Start address of memory area that can be used for
3747c609719bSwdenk		initial data and stack; please note that this must be
3748c609719bSwdenk		writable memory that is working WITHOUT special
3749c609719bSwdenk		initialization, i. e. you CANNOT use normal RAM which
3750c609719bSwdenk		will become available only after programming the
3751c609719bSwdenk		memory controller and running certain initialization
3752c609719bSwdenk		sequences.
3753c609719bSwdenk
3754c609719bSwdenk		U-Boot uses the following memory types:
3755c609719bSwdenk		- MPC8xx and MPC8260: IMMR (internal memory of the CPU)
3756c609719bSwdenk		- MPC824X: data cache
3757c609719bSwdenk		- PPC4xx:  data cache
3758c609719bSwdenk
37596d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET:
3760c609719bSwdenk
3761c609719bSwdenk		Offset of the initial data structure in the memory
37626d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually
37636d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial
3764c609719bSwdenk		data is located at the end of the available space
3765553f0982SWolfgang Denk		(sometimes written as (CONFIG_SYS_INIT_RAM_SIZE -
37666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just
37676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR +
37686d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_GBL_DATA_OFFSET) downward.
3769c609719bSwdenk
3770c609719bSwdenk	Note:
3771c609719bSwdenk		On the MPC824X (or other systems that use the data
3772c609719bSwdenk		cache for initial memory) the address chosen for
37736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must
3774c609719bSwdenk		point to an otherwise UNUSED address space between
3775c609719bSwdenk		the top of RAM and the start of the PCI space.
3776c609719bSwdenk
37776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR:	SIU Module Configuration (11-6)
3778c609719bSwdenk
37796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR:	System Protection Control (11-9)
3780c609719bSwdenk
37816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR:	Time Base Status and Control (11-26)
3782c609719bSwdenk
37836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR:	Periodic Interrupt Status and Control (11-31)
3784c609719bSwdenk
37856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR:	PLL, Low-Power, and Reset Control Register (15-30)
3786c609719bSwdenk
37876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR:	System Clock and reset Control Register (15-27)
3788c609719bSwdenk
37896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM:
3790c609719bSwdenk		SDRAM timing
3791c609719bSwdenk
37926d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA:
3793c609719bSwdenk		periodic timer for refresh
3794c609719bSwdenk
37956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER:	Debug Event Register (37-47)
3796c609719bSwdenk
37976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM,
37986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP,
37996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM,
38006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_BR1_PRELIM:
3801c609719bSwdenk		Memory Controller Definitions: BR0/1 and OR0/1 (FLASH)
3802c609719bSwdenk
3803c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE,
38046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM,
38056d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
3806c609719bSwdenk		Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
3807c609719bSwdenk
38086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K,
38096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL:
3810c609719bSwdenk		Machine Mode Register and Memory Periodic Timer
3811c609719bSwdenk		Prescaler definitions (SDRAM timing)
3812c609719bSwdenk
38136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]:
3814c609719bSwdenk		enable I2C microcode relocation patch (MPC8xx);
3815c609719bSwdenk		define relocation offset in DPRAM [DSP2]
3816c609719bSwdenk
38176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]:
3818b423d055SHeiko Schocher		enable SMC microcode relocation patch (MPC8xx);
3819b423d055SHeiko Schocher		define relocation offset in DPRAM [SMC1]
3820b423d055SHeiko Schocher
38216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]:
3822c609719bSwdenk		enable SPI microcode relocation patch (MPC8xx);
3823c609719bSwdenk		define relocation offset in DPRAM [SCC4]
3824c609719bSwdenk
38256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK:
3826c609719bSwdenk		Use OSCM clock mode on MBX8xx board. Be careful,
3827c609719bSwdenk		wrong setting might damage your board. Read
3828c609719bSwdenk		doc/README.MBX before setting this variable!
3829c609719bSwdenk
38306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only)
3831ea909b76Swdenk		Offset of the bootmode word in DPRAM used by post
3832ea909b76Swdenk		(Power On Self Tests). This definition overrides
3833ea909b76Swdenk		#define'd default value in commproc.h resp.
3834ea909b76Swdenk		cpm_8260.h.
3835ea909b76Swdenk
38366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB,
38376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL,
38386d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS,
38396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB,
38406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START,
38416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL,
38426d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE,
38436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD  CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only)
3844a47a12beSStefan Roese		Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set.
38455d232d0eSwdenk
38469cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE:
38479cacf4fcSDirk Eibach		Disable PCI-Express on systems where it is supported but not
38489cacf4fcSDirk Eibach		required.
38499cacf4fcSDirk Eibach
385069fd2d3bSAndrew Sharp- CONFIG_PCI_ENUM_ONLY
385169fd2d3bSAndrew Sharp		Only scan through and get the devices on the busses.
385269fd2d3bSAndrew Sharp		Don't do any setup work, presumably because someone or
385369fd2d3bSAndrew Sharp		something has already done it, and we don't need to do it
385469fd2d3bSAndrew Sharp		a second time.	Useful for platforms that are pre-booted
385569fd2d3bSAndrew Sharp		by coreboot or similar.
385669fd2d3bSAndrew Sharp
3857a09b9b68SKumar Gala- CONFIG_SYS_SRIO:
3858a09b9b68SKumar Gala		Chip has SRIO or not
3859a09b9b68SKumar Gala
3860a09b9b68SKumar Gala- CONFIG_SRIO1:
3861a09b9b68SKumar Gala		Board has SRIO 1 port available
3862a09b9b68SKumar Gala
3863a09b9b68SKumar Gala- CONFIG_SRIO2:
3864a09b9b68SKumar Gala		Board has SRIO 2 port available
3865a09b9b68SKumar Gala
3866a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT:
3867a09b9b68SKumar Gala		Virtual Address of SRIO port 'n' memory region
3868a09b9b68SKumar Gala
3869a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS:
3870a09b9b68SKumar Gala		Physical Address of SRIO port 'n' memory region
3871a09b9b68SKumar Gala
3872a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE:
3873a09b9b68SKumar Gala		Size of SRIO port 'n' memory region
3874a09b9b68SKumar Gala
387566bd1846SFabio Estevam- CONFIG_SYS_NAND_BUSWIDTH_16BIT
387666bd1846SFabio Estevam		Defined to tell the NAND controller that the NAND chip is using
387766bd1846SFabio Estevam		a 16 bit bus.
387866bd1846SFabio Estevam		Not all NAND drivers use this symbol.
3879a430e916SFabio Estevam		Example of drivers that use it:
388066bd1846SFabio Estevam		- drivers/mtd/nand/ndfc.c
3881a430e916SFabio Estevam		- drivers/mtd/nand/mxc_nand.c
3882eced4626SAlex Waterman
3883eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG
3884eced4626SAlex Waterman		Sets the EBC0_CFG register for the NDFC. If not defined
3885eced4626SAlex Waterman		a default value will be used.
3886eced4626SAlex Waterman
3887bb99ad6dSBen Warren- CONFIG_SPD_EEPROM
3888218ca724SWolfgang Denk		Get DDR timing information from an I2C EEPROM. Common
3889218ca724SWolfgang Denk		with pluggable memory modules such as SODIMMs
3890218ca724SWolfgang Denk
3891bb99ad6dSBen Warren  SPD_EEPROM_ADDRESS
3892bb99ad6dSBen Warren		I2C address of the SPD EEPROM
3893bb99ad6dSBen Warren
38946d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM
3895218ca724SWolfgang Denk		If SPD EEPROM is on an I2C bus other than the first
3896218ca724SWolfgang Denk		one, specify here. Note that the value must resolve
3897218ca724SWolfgang Denk		to something your driver can deal with.
3898bb99ad6dSBen Warren
38991b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING
39001b3e3c4fSYork Sun		Get DDR timing information from other than SPD. Common with
39011b3e3c4fSYork Sun		soldered DDR chips onboard without SPD. DDR raw timing
39021b3e3c4fSYork Sun		parameters are extracted from datasheet and hard-coded into
39031b3e3c4fSYork Sun		header files or board specific files.
39041b3e3c4fSYork Sun
39056f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE
39066f5e1dc5SYork Sun		Enable interactive DDR debugging. See doc/README.fsl-ddr.
39076f5e1dc5SYork Sun
39086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0
3909218ca724SWolfgang Denk		Only for 83xx systems. If specified, then DDR should
3910218ca724SWolfgang Denk		be configured using CS0 and CS1 instead of CS2 and CS3.
39112ad6b513STimur Tabi
3912c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12]
3913c26e454dSwdenk		Define to enable FEC[12] on a 8xx series processor.
3914c26e454dSwdenk
3915c26e454dSwdenk- CONFIG_FEC[12]_PHY
3916c26e454dSwdenk		Define to the hardcoded PHY address which corresponds
39176e592385Swdenk		to the given FEC; i. e.
3918c26e454dSwdenk			#define CONFIG_FEC1_PHY 4
3919c26e454dSwdenk		means that the PHY with address 4 is connected to FEC1
3920c26e454dSwdenk
3921c26e454dSwdenk		When set to -1, means to probe for first available.
3922c26e454dSwdenk
3923c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR
3924c26e454dSwdenk		The PHY does not have a RXERR line (RMII only).
3925c26e454dSwdenk		(so program the FEC to ignore it).
3926c26e454dSwdenk
3927c26e454dSwdenk- CONFIG_RMII
3928c26e454dSwdenk		Enable RMII mode for all FECs.
3929c26e454dSwdenk		Note that this is a global option, we can't
3930c26e454dSwdenk		have one FEC in standard MII mode and another in RMII mode.
3931c26e454dSwdenk
39325cf91d6bSwdenk- CONFIG_CRC32_VERIFY
39335cf91d6bSwdenk		Add a verify option to the crc32 command.
39345cf91d6bSwdenk		The syntax is:
39355cf91d6bSwdenk
39365cf91d6bSwdenk		=> crc32 -v <address> <count> <crc32>
39375cf91d6bSwdenk
39385cf91d6bSwdenk		Where address/count indicate a memory area
39395cf91d6bSwdenk		and crc32 is the correct crc32 which the
39405cf91d6bSwdenk		area should have.
39415cf91d6bSwdenk
394256523f12Swdenk- CONFIG_LOOPW
394356523f12Swdenk		Add the "loopw" memory command. This only takes effect if
3944602ad3b3SJon Loeliger		the memory commands are activated globally (CONFIG_CMD_MEM).
394556523f12Swdenk
39467b466641Sstroese- CONFIG_MX_CYCLIC
39477b466641Sstroese		Add the "mdc" and "mwc" memory commands. These are cyclic
39487b466641Sstroese		"md/mw" commands.
39497b466641Sstroese		Examples:
39507b466641Sstroese
39517b466641Sstroese		=> mdc.b 10 4 500
39527b466641Sstroese		This command will print 4 bytes (10,11,12,13) each 500 ms.
39537b466641Sstroese
39547b466641Sstroese		=> mwc.l 100 12345678 10
39557b466641Sstroese		This command will write 12345678 to address 100 all 10 ms.
39567b466641Sstroese
39577b466641Sstroese		This only takes effect if the memory commands are activated
3958602ad3b3SJon Loeliger		globally (CONFIG_CMD_MEM).
39597b466641Sstroese
39608aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT
3961afc1ce82SMacpaul Lin		[ARM, NDS32, MIPS only] If this variable is defined, then certain
3962e03f3169SWolfgang Denk		low level initializations (like setting up the memory
3963e03f3169SWolfgang Denk		controller) are omitted and/or U-Boot does not
3964e03f3169SWolfgang Denk		relocate itself into RAM.
39658aa1a2d1Swdenk
3966e03f3169SWolfgang Denk		Normally this variable MUST NOT be defined. The only
3967e03f3169SWolfgang Denk		exception is when U-Boot is loaded (to RAM) by some
3968e03f3169SWolfgang Denk		other boot loader or by a debugger which performs
3969e03f3169SWolfgang Denk		these initializations itself.
39708aa1a2d1Swdenk
3971401bb30bSAneesh V- CONFIG_SPL_BUILD
3972df81238bSMagnus Lilja		Modifies the behaviour of start.S when compiling a loader
3973df81238bSMagnus Lilja		that is executed before the actual U-Boot. E.g. when
3974df81238bSMagnus Lilja		compiling a NAND SPL.
3975400558b5Swdenk
39764213fc29SSimon Glass- CONFIG_ARCH_MAP_SYSMEM
39774213fc29SSimon Glass		Generally U-Boot (and in particular the md command) uses
39784213fc29SSimon Glass		effective address. It is therefore not necessary to regard
39794213fc29SSimon Glass		U-Boot address as virtual addresses that need to be translated
39804213fc29SSimon Glass		to physical addresses. However, sandbox requires this, since
39814213fc29SSimon Glass		it maintains its own little RAM buffer which contains all
39824213fc29SSimon Glass		addressable memory. This option causes some memory accesses
39834213fc29SSimon Glass		to be mapped through map_sysmem() / unmap_sysmem().
39844213fc29SSimon Glass
3985d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY
3986d8834a13SMatthias Weisser  CONFIG_USE_ARCH_MEMSET
3987d8834a13SMatthias Weisser		If these options are used a optimized version of memcpy/memset will
3988d8834a13SMatthias Weisser		be used if available. These functions may be faster under some
3989d8834a13SMatthias Weisser		conditions but may increase the binary size.
3990d8834a13SMatthias Weisser
3991588a13f7SSimon Glass- CONFIG_X86_RESET_VECTOR
3992588a13f7SSimon Glass		If defined, the x86 reset vector code is included. This is not
3993588a13f7SSimon Glass		needed when U-Boot is running from Coreboot.
3994b16f521aSGabe Black
3995fc33705eSMark Jackson- CONFIG_SYS_MPUCLK
3996fc33705eSMark Jackson		Defines the MPU clock speed (in MHz).
3997fc33705eSMark Jackson
3998fc33705eSMark Jackson		NOTE : currently only supported on AM335x platforms.
39995b5ece9eSGabe Black
4000f2717b47STimur TabiFreescale QE/FMAN Firmware Support:
4001f2717b47STimur Tabi-----------------------------------
4002f2717b47STimur Tabi
4003f2717b47STimur TabiThe Freescale QUICCEngine (QE) and Frame Manager (FMAN) both support the
4004f2717b47STimur Tabiloading of "firmware", which is encoded in the QE firmware binary format.
4005f2717b47STimur TabiThis firmware often needs to be loaded during U-Boot booting, so macros
4006f2717b47STimur Tabiare used to identify the storage device (NOR flash, SPI, etc) and the address
4007f2717b47STimur Tabiwithin that device.
4008f2717b47STimur Tabi
4009f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_ADDR
4010f2717b47STimur Tabi	The address in the storage device where the firmware is located.  The
4011f2717b47STimur Tabi	meaning of this address depends on which CONFIG_SYS_QE_FW_IN_xxx macro
4012f2717b47STimur Tabi	is also specified.
4013f2717b47STimur Tabi
4014f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_LENGTH
4015f2717b47STimur Tabi	The maximum possible size of the firmware.  The firmware binary format
4016f2717b47STimur Tabi	has a field that specifies the actual size of the firmware, but it
4017f2717b47STimur Tabi	might not be possible to read any part of the firmware unless some
4018f2717b47STimur Tabi	local storage is allocated to hold the entire firmware first.
4019f2717b47STimur Tabi
4020f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NOR
4021f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NOR flash, mapped as
4022f2717b47STimur Tabi	normal addressable memory via the LBC.  CONFIG_SYS_FMAN_FW_ADDR is the
4023f2717b47STimur Tabi	virtual address in NOR flash.
4024f2717b47STimur Tabi
4025f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_NAND
4026f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located in NAND flash.
4027f2717b47STimur Tabi	CONFIG_SYS_FMAN_FW_ADDR is the offset within NAND flash.
4028f2717b47STimur Tabi
4029f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_MMC
4030f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SD/MMC
4031f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4032f2717b47STimur Tabi
4033f2717b47STimur Tabi- CONFIG_SYS_QE_FMAN_FW_IN_SPIFLASH
4034f2717b47STimur Tabi	Specifies that QE/FMAN firmware is located on the primary SPI
4035f2717b47STimur Tabi	device.  CONFIG_SYS_FMAN_FW_ADDR is the byte offset on that device.
4036f2717b47STimur Tabi
4037292dc6c5SLiu Gang- CONFIG_SYS_QE_FMAN_FW_IN_REMOTE
4038292dc6c5SLiu Gang	Specifies that QE/FMAN firmware is located in the remote (master)
4039292dc6c5SLiu Gang	memory space.	CONFIG_SYS_FMAN_FW_ADDR is a virtual address which
4040fc54c7faSLiu Gang	can be mapped from slave TLB->slave LAW->slave SRIO or PCIE outbound
4041fc54c7faSLiu Gang	window->master inbound window->master LAW->the ucode address in
4042fc54c7faSLiu Gang	master's memory space.
4043f2717b47STimur Tabi
4044c609719bSwdenkBuilding the Software:
4045c609719bSwdenk======================
4046c609719bSwdenk
4047218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments
4048218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support
4049218ca724SWolfgang Denkall possibly existing versions of cross development tools in all
4050218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we
4051218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK)
4052218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot.
4053c609719bSwdenk
4054218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you
4055218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case,
4056218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell.
4057218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are
4058218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter:
4059c609719bSwdenk
4060218ca724SWolfgang Denk	$ CROSS_COMPILE=ppc_4xx-
4061218ca724SWolfgang Denk	$ export CROSS_COMPILE
4062c609719bSwdenk
40632f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in
40642f8d396bSPeter Tyser      the tools directory you can use the MinGW toolchain
40652f8d396bSPeter Tyser      (http://www.mingw.org).  Set your HOST tools to the MinGW
40662f8d396bSPeter Tyser      toolchain and execute 'make tools'.  For example:
40672f8d396bSPeter Tyser
40682f8d396bSPeter Tyser       $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
40692f8d396bSPeter Tyser
40702f8d396bSPeter Tyser      Binaries such as tools/mkimage.exe will be created which can
40712f8d396bSPeter Tyser      be executed on computers running Windows.
40722f8d396bSPeter Tyser
4073c609719bSwdenkU-Boot is intended to be simple to build. After installing the
4074c609719bSwdenksources you must configure U-Boot for one specific board type. This
4075c609719bSwdenkis done by typing:
4076c609719bSwdenk
4077c609719bSwdenk	make NAME_config
4078c609719bSwdenk
4079218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu-
40804d675ae6SMichael Jonesrations; see boards.cfg for supported names.
408154387ac9Swdenk
4082c609719bSwdenkNote: for some board special configuration names may exist; check if
4083c609719bSwdenk      additional information is available from the board vendor; for
40842729af9dSwdenk      instance, the TQM823L systems are available without (standard)
40852729af9dSwdenk      or with LCD support. You can select such additional "features"
408611ccc33fSMarcel Ziswiler      when choosing the configuration, i. e.
4087c609719bSwdenk
40882729af9dSwdenk      make TQM823L_config
40892729af9dSwdenk	- will configure for a plain TQM823L, i. e. no LCD support
4090c609719bSwdenk
4091c609719bSwdenk      make TQM823L_LCD_config
4092c609719bSwdenk	- will configure for a TQM823L with U-Boot console on LCD
4093c609719bSwdenk
4094c609719bSwdenk      etc.
4095c609719bSwdenk
4096c609719bSwdenk
4097c609719bSwdenkFinally, type "make all", and you should get some working U-Boot
40987152b1d0Swdenkimages ready for download to / installation on your system:
4099c609719bSwdenk
4100c609719bSwdenk- "u-boot.bin" is a raw binary image
4101c609719bSwdenk- "u-boot" is an image in ELF binary format
4102c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format
4103c609719bSwdenk
4104baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved
4105baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change
4106baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory:
4107baf31249SMarian Balakowicz
4108baf31249SMarian Balakowicz1. Add O= to the make command line invocations:
4109baf31249SMarian Balakowicz
4110baf31249SMarian Balakowicz	make O=/tmp/build distclean
4111baf31249SMarian Balakowicz	make O=/tmp/build NAME_config
4112baf31249SMarian Balakowicz	make O=/tmp/build all
4113baf31249SMarian Balakowicz
4114baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location:
4115baf31249SMarian Balakowicz
4116baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4117baf31249SMarian Balakowicz	make distclean
4118baf31249SMarian Balakowicz	make NAME_config
4119baf31249SMarian Balakowicz	make all
4120baf31249SMarian Balakowicz
4121baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment
4122baf31249SMarian Balakowiczvariable.
4123baf31249SMarian Balakowicz
4124c609719bSwdenk
4125c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so
4126c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of
4127c609719bSwdenknative "make".
4128c609719bSwdenk
4129c609719bSwdenk
4130c609719bSwdenkIf the system board that you have is not listed, then you will need
4131c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these
4132c609719bSwdenksteps:
4133c609719bSwdenk
4134c609719bSwdenk1.  Add a new configuration option for your board to the toplevel
41354d675ae6SMichael Jones    "boards.cfg" file, using the existing entries as examples.
41364d675ae6SMichael Jones    Follow the instructions there to keep the boards in order.
4137c609719bSwdenk2.  Create a new directory to hold your board specific code. Add any
413885ec0bccSwdenk    files you need. In your board directory, you will need at least
413985ec0bccSwdenk    the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds".
414085ec0bccSwdenk3.  Create a new configuration file "include/configs/<board>.h" for
414185ec0bccSwdenk    your board
4142c609719bSwdenk3.  If you're porting U-Boot to a new CPU, then also create a new
4143c609719bSwdenk    directory to hold your CPU specific code. Add any files you need.
414485ec0bccSwdenk4.  Run "make <board>_config" with your new name.
4145c609719bSwdenk5.  Type "make", and you should get a working "u-boot.srec" file
4146c609719bSwdenk    to be installed on your target system.
414785ec0bccSwdenk6.  Debug and solve any problems that might arise.
4148c609719bSwdenk    [Of course, this last step is much harder than it sounds.]
4149c609719bSwdenk
4150c609719bSwdenk
4151c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.:
4152c609719bSwdenk==============================================================
4153c609719bSwdenk
4154c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board
4155c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to
4156c609719bSwdenkprovide feedback to the other developers. The feedback normally takes
4157c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest
4158218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources.
4159c609719bSwdenk
4160c609719bSwdenkBut before you submit such a patch, please verify that your modifi-
4161c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of
4162c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so,
4163c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot
4164c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can
41657152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE'
4166218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools
4167218ca724SWolfgang Denkyou can type
4168c609719bSwdenk
4169c609719bSwdenk	CROSS_COMPILE=ppc_8xx- MAKEALL
4170c609719bSwdenk
4171c609719bSwdenkor to build on a native PowerPC system you can type
4172c609719bSwdenk
4173c609719bSwdenk	CROSS_COMPILE=' ' MAKEALL
4174c609719bSwdenk
4175218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build
4176218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by
4177218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target
4178218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and
4179218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default
4180218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment
4181218ca724SWolfgang Denkvariable. For example:
4182baf31249SMarian Balakowicz
4183baf31249SMarian Balakowicz	export BUILD_DIR=/tmp/build
4184baf31249SMarian Balakowicz	export MAKEALL_LOGDIR=/tmp/log
4185baf31249SMarian Balakowicz	CROSS_COMPILE=ppc_8xx- MAKEALL
4186baf31249SMarian Balakowicz
4187218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build,
4188218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean
4189218ca724SWolfgang Denkduring the whole build process.
4190baf31249SMarian Balakowicz
4191baf31249SMarian Balakowicz
4192c609719bSwdenkSee also "U-Boot Porting Guide" below.
4193c609719bSwdenk
4194c609719bSwdenk
4195c609719bSwdenkMonitor Commands - Overview:
4196c609719bSwdenk============================
4197c609719bSwdenk
4198c609719bSwdenkgo	- start application at address 'addr'
4199c609719bSwdenkrun	- run commands in an environment variable
4200c609719bSwdenkbootm	- boot application image from memory
4201c609719bSwdenkbootp	- boot image via network using BootP/TFTP protocol
420244f074c7SMarek Vasutbootz   - boot zImage from memory
4203c609719bSwdenktftpboot- boot image via network using TFTP protocol
4204c609719bSwdenk	       and env variables "ipaddr" and "serverip"
4205c609719bSwdenk	       (and eventually "gatewayip")
42061fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol
4207c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol
4208c609719bSwdenkdiskboot- boot from IDE devicebootd   - boot default, i.e., run 'bootcmd'
4209c609719bSwdenkloads	- load S-Record file over serial line
4210c609719bSwdenkloadb	- load binary file over serial line (kermit mode)
4211c609719bSwdenkmd	- memory display
4212c609719bSwdenkmm	- memory modify (auto-incrementing)
4213c609719bSwdenknm	- memory modify (constant address)
4214c609719bSwdenkmw	- memory write (fill)
4215c609719bSwdenkcp	- memory copy
4216c609719bSwdenkcmp	- memory compare
4217c609719bSwdenkcrc32	- checksum calculation
42180f89c54bSPeter Tyseri2c	- I2C sub-system
4219c609719bSwdenksspi	- SPI utility commands
4220c609719bSwdenkbase	- print or set address offset
4221c609719bSwdenkprintenv- print environment variables
4222c609719bSwdenksetenv	- set environment variables
4223c609719bSwdenksaveenv - save environment variables to persistent storage
4224c609719bSwdenkprotect - enable or disable FLASH write protection
4225c609719bSwdenkerase	- erase FLASH memory
4226c609719bSwdenkflinfo	- print FLASH memory information
422710635afaSKarl O. Pincnand	- NAND memory operations (see doc/README.nand)
4228c609719bSwdenkbdinfo	- print Board Info structure
4229c609719bSwdenkiminfo	- print header information for application image
4230c609719bSwdenkconinfo - print console devices and informations
4231c609719bSwdenkide	- IDE sub-system
4232c609719bSwdenkloop	- infinite loop on address range
423356523f12Swdenkloopw	- infinite write loop on address range
4234c609719bSwdenkmtest	- simple RAM test
4235c609719bSwdenkicache	- enable or disable instruction cache
4236c609719bSwdenkdcache	- enable or disable data cache
4237c609719bSwdenkreset	- Perform RESET of the CPU
4238c609719bSwdenkecho	- echo args to console
4239c609719bSwdenkversion - print monitor version
4240c609719bSwdenkhelp	- print online help
4241c609719bSwdenk?	- alias for 'help'
4242c609719bSwdenk
4243c609719bSwdenk
4244c609719bSwdenkMonitor Commands - Detailed Description:
4245c609719bSwdenk========================================
4246c609719bSwdenk
4247c609719bSwdenkTODO.
4248c609719bSwdenk
4249c609719bSwdenkFor now: just type "help <command>".
4250c609719bSwdenk
4251c609719bSwdenk
4252c609719bSwdenkEnvironment Variables:
4253c609719bSwdenk======================
4254c609719bSwdenk
4255c609719bSwdenkU-Boot supports user configuration using Environment Variables which
4256c609719bSwdenkcan be made persistent by saving to Flash memory.
4257c609719bSwdenk
4258c609719bSwdenkEnvironment Variables are set using "setenv", printed using
4259c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv"
4260c609719bSwdenkwithout a value can be used to delete a variable from the
4261c609719bSwdenkenvironment. As long as you don't save the environment you are
4262c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the
4263c609719bSwdenkenvironment is erased by accident, a default environment is provided.
4264c609719bSwdenk
4265c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables.
4266c96f86eeSWolfgang Denk
4267c96f86eeSWolfgang DenkList of environment variables (most likely not complete):
4268c609719bSwdenk
4269c609719bSwdenk  baudrate	- see CONFIG_BAUDRATE
4270c609719bSwdenk
4271c609719bSwdenk  bootdelay	- see CONFIG_BOOTDELAY
4272c609719bSwdenk
4273c609719bSwdenk  bootcmd	- see CONFIG_BOOTCOMMAND
4274c609719bSwdenk
4275c609719bSwdenk  bootargs	- Boot arguments when booting an RTOS image
4276c609719bSwdenk
4277c609719bSwdenk  bootfile	- Name of the image to load with TFTP
4278c609719bSwdenk
42797d721e34SBartlomiej Sieka  bootm_low	- Memory range available for image processing in the bootm
42807d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
42817d721e34SBartlomiej Sieka		  a hexadecimal number and defines lowest address allowed
42827d721e34SBartlomiej Sieka		  for use by the bootm command. See also "bootm_size"
42837d721e34SBartlomiej Sieka		  environment variable. Address defined by "bootm_low" is
42847d721e34SBartlomiej Sieka		  also the base of the initial memory mapping for the Linux
4285c3624e6eSGrant Likely		  kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
4286c3624e6eSGrant Likely		  bootm_mapsize.
4287c3624e6eSGrant Likely
4288c3624e6eSGrant Likely  bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
4289c3624e6eSGrant Likely		  This variable is given as a hexadecimal number and it
4290c3624e6eSGrant Likely		  defines the size of the memory region starting at base
4291c3624e6eSGrant Likely		  address bootm_low that is accessible by the Linux kernel
4292c3624e6eSGrant Likely		  during early boot.  If unset, CONFIG_SYS_BOOTMAPSZ is used
4293c3624e6eSGrant Likely		  as the default value if it is defined, and bootm_size is
4294c3624e6eSGrant Likely		  used otherwise.
42957d721e34SBartlomiej Sieka
42967d721e34SBartlomiej Sieka  bootm_size	- Memory range available for image processing in the bootm
42977d721e34SBartlomiej Sieka		  command can be restricted. This variable is given as
42987d721e34SBartlomiej Sieka		  a hexadecimal number and defines the size of the region
42997d721e34SBartlomiej Sieka		  allowed for use by the bootm command. See also "bootm_low"
43007d721e34SBartlomiej Sieka		  environment variable.
43017d721e34SBartlomiej Sieka
43024bae9090SBartlomiej Sieka  updatefile	- Location of the software update file on a TFTP server, used
43034bae9090SBartlomiej Sieka		  by the automatic software update feature. Please refer to
43044bae9090SBartlomiej Sieka		  documentation in doc/README.update for more details.
43054bae9090SBartlomiej Sieka
4306c609719bSwdenk  autoload	- if set to "no" (any string beginning with 'n'),
4307c609719bSwdenk		  "bootp" will just load perform a lookup of the
4308c609719bSwdenk		  configuration from the BOOTP server, but not try to
4309c609719bSwdenk		  load any image using TFTP
4310c609719bSwdenk
4311c609719bSwdenk  autostart	- if set to "yes", an image loaded using the "bootp",
4312c609719bSwdenk		  "rarpboot", "tftpboot" or "diskboot" commands will
4313c609719bSwdenk		  be automatically started (by internally calling
4314c609719bSwdenk		  "bootm")
4315c609719bSwdenk
43164a6fd34bSwdenk		  If set to "no", a standalone image passed to the
43174a6fd34bSwdenk		  "bootm" command will be copied to the load address
43184a6fd34bSwdenk		  (and eventually uncompressed), but NOT be started.
43194a6fd34bSwdenk		  This can be used to load and uncompress arbitrary
43204a6fd34bSwdenk		  data.
43214a6fd34bSwdenk
4322a28afca5SDavid A. Long  fdt_high	- if set this restricts the maximum address that the
4323a28afca5SDavid A. Long		  flattened device tree will be copied into upon boot.
4324fa34f6b2SShawn Guo		  For example, if you have a system with 1 GB memory
4325fa34f6b2SShawn Guo		  at physical address 0x10000000, while Linux kernel
4326fa34f6b2SShawn Guo		  only recognizes the first 704 MB as low memory, you
4327fa34f6b2SShawn Guo		  may need to set fdt_high as 0x3C000000 to have the
4328fa34f6b2SShawn Guo		  device tree blob be copied to the maximum address
4329fa34f6b2SShawn Guo		  of the 704 MB low memory, so that Linux kernel can
4330fa34f6b2SShawn Guo		  access it during the boot procedure.
4331fa34f6b2SShawn Guo
4332a28afca5SDavid A. Long		  If this is set to the special value 0xFFFFFFFF then
4333a28afca5SDavid A. Long		  the fdt will not be copied at all on boot.  For this
4334a28afca5SDavid A. Long		  to work it must reside in writable memory, have
4335a28afca5SDavid A. Long		  sufficient padding on the end of it for u-boot to
4336a28afca5SDavid A. Long		  add the information it needs into it, and the memory
4337a28afca5SDavid A. Long		  must be accessible by the kernel.
4338a28afca5SDavid A. Long
4339eea63e05SSimon Glass  fdtcontroladdr- if set this is the address of the control flattened
4340eea63e05SSimon Glass		  device tree used by U-Boot when CONFIG_OF_CONTROL is
4341eea63e05SSimon Glass		  defined.
4342eea63e05SSimon Glass
434317ea1177Swdenk  i2cfast	- (PPC405GP|PPC405EP only)
434417ea1177Swdenk		  if set to 'y' configures Linux I2C driver for fast
434517ea1177Swdenk		  mode (400kHZ). This environment variable is used in
434617ea1177Swdenk		  initialization code. So, for changes to be effective
434717ea1177Swdenk		  it must be saved and board must be reset.
434817ea1177Swdenk
4349c609719bSwdenk  initrd_high	- restrict positioning of initrd images:
4350c609719bSwdenk		  If this variable is not set, initrd images will be
4351c609719bSwdenk		  copied to the highest possible address in RAM; this
4352c609719bSwdenk		  is usually what you want since it allows for
4353c609719bSwdenk		  maximum initrd size. If for some reason you want to
4354c609719bSwdenk		  make sure that the initrd image is loaded below the
43556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD		  CONFIG_SYS_BOOTMAPSZ limit, you can set this environment
4356c609719bSwdenk		  variable to a value of "no" or "off" or "0".
4357c609719bSwdenk		  Alternatively, you can set it to a maximum upper
4358c609719bSwdenk		  address to use (U-Boot will still check that it
4359c609719bSwdenk		  does not overwrite the U-Boot stack and data).
4360c609719bSwdenk
4361c609719bSwdenk		  For instance, when you have a system with 16 MB
43627152b1d0Swdenk		  RAM, and want to reserve 4 MB from use by Linux,
4363c609719bSwdenk		  you can do this by adding "mem=12M" to the value of
4364c609719bSwdenk		  the "bootargs" variable. However, now you must make
43657152b1d0Swdenk		  sure that the initrd image is placed in the first
4366c609719bSwdenk		  12 MB as well - this can be done with
4367c609719bSwdenk
4368c609719bSwdenk		  setenv initrd_high 00c00000
4369c609719bSwdenk
437038b99261Swdenk		  If you set initrd_high to 0xFFFFFFFF, this is an
437138b99261Swdenk		  indication to U-Boot that all addresses are legal
437238b99261Swdenk		  for the Linux kernel, including addresses in flash
437338b99261Swdenk		  memory. In this case U-Boot will NOT COPY the
437438b99261Swdenk		  ramdisk at all. This may be useful to reduce the
437538b99261Swdenk		  boot time on your system, but requires that this
437638b99261Swdenk		  feature is supported by your Linux kernel.
437738b99261Swdenk
4378c609719bSwdenk  ipaddr	- IP address; needed for tftpboot command
4379c609719bSwdenk
4380c609719bSwdenk  loadaddr	- Default load address for commands like "bootp",
4381dc7c9a1aSwdenk		  "rarpboot", "tftpboot", "loadb" or "diskboot"
4382c609719bSwdenk
4383c609719bSwdenk  loads_echo	- see CONFIG_LOADS_ECHO
4384c609719bSwdenk
4385c609719bSwdenk  serverip	- TFTP server IP address; needed for tftpboot command
4386c609719bSwdenk
4387c609719bSwdenk  bootretry	- see CONFIG_BOOT_RETRY_TIME
4388c609719bSwdenk
4389c609719bSwdenk  bootdelaykey	- see CONFIG_AUTOBOOT_DELAY_STR
4390c609719bSwdenk
4391c609719bSwdenk  bootstopkey	- see CONFIG_AUTOBOOT_STOP_STR
4392c609719bSwdenk
4393e2a53458SMike Frysinger  ethprime	- controls which interface is used first.
4394a3d991bdSwdenk
4395e2a53458SMike Frysinger  ethact	- controls which interface is currently active.
4396e2a53458SMike Frysinger		  For example you can do the following
4397a3d991bdSwdenk
439848690d80SHeiko Schocher		  => setenv ethact FEC
439948690d80SHeiko Schocher		  => ping 192.168.0.1 # traffic sent on FEC
440048690d80SHeiko Schocher		  => setenv ethact SCC
440148690d80SHeiko Schocher		  => ping 10.0.0.1 # traffic sent on SCC
4402a3d991bdSwdenk
4403e1692577SMatthias Fuchs  ethrotate	- When set to "no" U-Boot does not go through all
4404e1692577SMatthias Fuchs		  available network interfaces.
4405e1692577SMatthias Fuchs		  It just stays at the currently selected interface.
4406e1692577SMatthias Fuchs
4407a3d991bdSwdenk  netretry	- When set to "no" each network operation will
4408a3d991bdSwdenk		  either succeed or fail without retrying.
44096e592385Swdenk		  When set to "once" the network operation will
44106e592385Swdenk		  fail when all the available network interfaces
44116e592385Swdenk		  are tried once without success.
4412a3d991bdSwdenk		  Useful on scripts which control the retry operation
4413a3d991bdSwdenk		  themselves.
4414a3d991bdSwdenk
4415b4e2f89dSJean-Christophe PLAGNIOL-VILLARD  npe_ucode	- set load address for the NPE microcode
4416a1cf027aSJean-Christophe PLAGNIOL-VILLARD
441728cb9375SWolfgang Denk  tftpsrcport	- If this is set, the value is used for TFTP's
4418ecb0ccd9SWolfgang Denk		  UDP source port.
4419ecb0ccd9SWolfgang Denk
442028cb9375SWolfgang Denk  tftpdstport	- If this is set, the value is used for TFTP's UDP
442128cb9375SWolfgang Denk		  destination port instead of the Well Know Port 69.
442228cb9375SWolfgang Denk
4423c96f86eeSWolfgang Denk  tftpblocksize - Block size to use for TFTP transfers; if not set,
4424c96f86eeSWolfgang Denk		  we use the TFTP server's default block size
4425c96f86eeSWolfgang Denk
4426c96f86eeSWolfgang Denk  tftptimeout	- Retransmission timeout for TFTP packets (in milli-
4427c96f86eeSWolfgang Denk		  seconds, minimum value is 1000 = 1 second). Defines
4428c96f86eeSWolfgang Denk		  when a packet is considered to be lost so it has to
4429c96f86eeSWolfgang Denk		  be retransmitted. The default is 5000 = 5 seconds.
4430c96f86eeSWolfgang Denk		  Lowering this value may make downloads succeed
4431c96f86eeSWolfgang Denk		  faster in networks with high packet loss rates or
4432c96f86eeSWolfgang Denk		  with unreliable TFTP servers.
4433c96f86eeSWolfgang Denk
4434a3d991bdSwdenk  vlan		- When set to a value < 4095 the traffic over
443511ccc33fSMarcel Ziswiler		  Ethernet is encapsulated/received over 802.1q
4436a3d991bdSwdenk		  VLAN tagged frames.
4437c609719bSwdenk
4438dc0b7b0eSJason HobbsThe following image location variables contain the location of images
4439dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is
4440dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment
4441dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP
4442dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be
4443dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR
4444dc0b7b0eSJason Hobbsflash or offset in NAND flash.
4445dc0b7b0eSJason Hobbs
4446dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some
4447dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some
4448dc0b7b0eSJason Hobbsboards use these variables for other purposes.
4449dc0b7b0eSJason Hobbs
4450dc0b7b0eSJason HobbsImage		    File Name	     RAM Address       Flash Location
4451dc0b7b0eSJason Hobbs-----		    ---------	     -----------       --------------
4452dc0b7b0eSJason Hobbsu-boot		    u-boot	     u-boot_addr_r     u-boot_addr
4453dc0b7b0eSJason HobbsLinux kernel	    bootfile	     kernel_addr_r     kernel_addr
4454dc0b7b0eSJason Hobbsdevice tree blob    fdtfile	     fdt_addr_r	       fdt_addr
4455dc0b7b0eSJason Hobbsramdisk		    ramdiskfile	     ramdisk_addr_r    ramdisk_addr
4456dc0b7b0eSJason Hobbs
4457c609719bSwdenkThe following environment variables may be used and automatically
4458c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"),
4459c609719bSwdenkdepending the information provided by your boot server:
4460c609719bSwdenk
4461c609719bSwdenk  bootfile	- see above
4462c609719bSwdenk  dnsip		- IP address of your Domain Name Server
4463fe389a82Sstroese  dnsip2	- IP address of your secondary Domain Name Server
4464c609719bSwdenk  gatewayip	- IP address of the Gateway (Router) to use
4465c609719bSwdenk  hostname	- Target hostname
4466c609719bSwdenk  ipaddr	- see above
4467c609719bSwdenk  netmask	- Subnet Mask
4468c609719bSwdenk  rootpath	- Pathname of the root filesystem on the NFS server
4469c609719bSwdenk  serverip	- see above
4470c609719bSwdenk
4471c609719bSwdenk
4472c609719bSwdenkThere are two special Environment Variables:
4473c609719bSwdenk
4474c609719bSwdenk  serial#	- contains hardware identification information such
4475c609719bSwdenk		  as type string and/or serial number
4476c609719bSwdenk  ethaddr	- Ethernet address
4477c609719bSwdenk
4478c609719bSwdenkThese variables can be set only once (usually during manufacturing of
4479c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables
4480c609719bSwdenkonce they have been set once.
4481c609719bSwdenk
4482c609719bSwdenk
4483c1551ea8SstroeseFurther special Environment Variables:
4484c1551ea8Sstroese
4485c1551ea8Sstroese  ver		- Contains the U-Boot version string as printed
4486c1551ea8Sstroese		  with the "version" command. This variable is
4487c1551ea8Sstroese		  readonly (see CONFIG_VERSION_VARIABLE).
4488c1551ea8Sstroese
4489c1551ea8Sstroese
4490c609719bSwdenkPlease note that changes to some configuration parameters may take
4491c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-).
4492c609719bSwdenk
4493c609719bSwdenk
4494170ab110SJoe HershbergerCallback functions for environment variables:
4495170ab110SJoe Hershberger---------------------------------------------
4496170ab110SJoe Hershberger
4497170ab110SJoe HershbergerFor some environment variables, the behavior of u-boot needs to change
4498170ab110SJoe Hershbergerwhen their values are changed.  This functionailty allows functions to
4499170ab110SJoe Hershbergerbe associated with arbitrary variables.  On creation, overwrite, or
4500170ab110SJoe Hershbergerdeletion, the callback will provide the opportunity for some side
4501170ab110SJoe Hershbergereffect to happen or for the change to be rejected.
4502170ab110SJoe Hershberger
4503170ab110SJoe HershbergerThe callbacks are named and associated with a function using the
4504170ab110SJoe HershbergerU_BOOT_ENV_CALLBACK macro in your board or driver code.
4505170ab110SJoe Hershberger
4506170ab110SJoe HershbergerThese callbacks are associated with variables in one of two ways.  The
4507170ab110SJoe Hershbergerstatic list can be added to by defining CONFIG_ENV_CALLBACK_LIST_STATIC
4508170ab110SJoe Hershbergerin the board configuration to a string that defines a list of
4509170ab110SJoe Hershbergerassociations.  The list must be in the following format:
4510170ab110SJoe Hershberger
4511170ab110SJoe Hershberger	entry = variable_name[:callback_name]
4512170ab110SJoe Hershberger	list = entry[,list]
4513170ab110SJoe Hershberger
4514170ab110SJoe HershbergerIf the callback name is not specified, then the callback is deleted.
4515170ab110SJoe HershbergerSpaces are also allowed anywhere in the list.
4516170ab110SJoe Hershberger
4517170ab110SJoe HershbergerCallbacks can also be associated by defining the ".callbacks" variable
4518170ab110SJoe Hershbergerwith the same list format above.  Any association in ".callbacks" will
4519170ab110SJoe Hershbergeroverride any association in the static list. You can define
4520170ab110SJoe HershbergerCONFIG_ENV_CALLBACK_LIST_DEFAULT to a list (string) to define the
4521170ab110SJoe Hershberger".callbacks" envirnoment variable in the default or embedded environment.
4522170ab110SJoe Hershberger
4523170ab110SJoe Hershberger
4524f07771ccSwdenkCommand Line Parsing:
4525f07771ccSwdenk=====================
4526f07771ccSwdenk
4527f07771ccSwdenkThere are two different command line parsers available with U-Boot:
45287152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell:
4529f07771ccSwdenk
4530f07771ccSwdenkOld, simple command line parser:
4531f07771ccSwdenk--------------------------------
4532f07771ccSwdenk
4533f07771ccSwdenk- supports environment variables (through setenv / saveenv commands)
4534f07771ccSwdenk- several commands on one line, separated by ';'
4535fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax
4536f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\',
4537f07771ccSwdenk  for example:
4538fe126d8bSWolfgang Denk	setenv bootcmd bootm \${address}
4539f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example:
4540f07771ccSwdenk	setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
4541f07771ccSwdenk
4542f07771ccSwdenkHush shell:
4543f07771ccSwdenk-----------
4544f07771ccSwdenk
4545f07771ccSwdenk- similar to Bourne shell, with control structures like
4546f07771ccSwdenk  if...then...else...fi, for...do...done; while...do...done,
4547f07771ccSwdenk  until...do...done, ...
4548f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv
4549f07771ccSwdenk  commands) and local shell variables (through standard shell syntax
4550f07771ccSwdenk  "name=value"); only environment variables can be used with "run"
4551f07771ccSwdenk  command
4552f07771ccSwdenk
4553f07771ccSwdenkGeneral rules:
4554f07771ccSwdenk--------------
4555f07771ccSwdenk
4556f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run"
4557f07771ccSwdenk    command) contains several commands separated by semicolon, and
4558f07771ccSwdenk    one of these commands fails, then the remaining commands will be
4559f07771ccSwdenk    executed anyway.
4560f07771ccSwdenk
4561f07771ccSwdenk(2) If you execute several variables with one call to run (i. e.
456211ccc33fSMarcel Ziswiler    calling run with a list of variables as arguments), any failing
4563f07771ccSwdenk    command will cause "run" to terminate, i. e. the remaining
4564f07771ccSwdenk    variables are not executed.
4565f07771ccSwdenk
4566c609719bSwdenkNote for Redundant Ethernet Interfaces:
4567c609719bSwdenk=======================================
4568c609719bSwdenk
456911ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports
4570c609719bSwdenksuch configurations and is capable of automatic selection of a
45717152b1d0Swdenk"working" interface when needed. MAC assignment works as follows:
4572c609719bSwdenk
4573c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding
4574c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0),
4575c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ...
4576c609719bSwdenk
4577c609719bSwdenkIf the network interface stores some valid MAC address (for instance
4578c609719bSwdenkin SROM), this is used as default address if there is NO correspon-
4579c609719bSwdenkding setting in the environment; if the corresponding environment
4580c609719bSwdenkvariable is set, this overrides the settings in the card; that means:
4581c609719bSwdenk
4582c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the
4583c609719bSwdenk  environment, the SROM's address is used.
4584c609719bSwdenk
4585c609719bSwdenko If there is no valid address in the SROM, and a definition in the
4586c609719bSwdenk  environment exists, then the value from the environment variable is
4587c609719bSwdenk  used.
4588c609719bSwdenk
4589c609719bSwdenko If both the SROM and the environment contain a MAC address, and
4590c609719bSwdenk  both addresses are the same, this MAC address is used.
4591c609719bSwdenk
4592c609719bSwdenko If both the SROM and the environment contain a MAC address, and the
4593c609719bSwdenk  addresses differ, the value from the environment is used and a
4594c609719bSwdenk  warning is printed.
4595c609719bSwdenk
4596c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error
4597c609719bSwdenk  is raised.
4598c609719bSwdenk
4599ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses
4600ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process.	 This
4601ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable.
4602ecee9324SBen WarrenThe naming convention is as follows:
4603ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc.
4604c609719bSwdenk
4605c609719bSwdenkImage Formats:
4606c609719bSwdenk==============
4607c609719bSwdenk
46083310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on)
46093310c549SMarian Balakowiczimages in two formats:
46103310c549SMarian Balakowicz
46113310c549SMarian BalakowiczNew uImage format (FIT)
46123310c549SMarian Balakowicz-----------------------
46133310c549SMarian Balakowicz
46143310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar
46153310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple
46163310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by
46173310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory.
46183310c549SMarian Balakowicz
46193310c549SMarian Balakowicz
46203310c549SMarian BalakowiczOld uImage format
46213310c549SMarian Balakowicz-----------------
46223310c549SMarian Balakowicz
46233310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything,
46243310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for
46253310c549SMarian Balakowiczdetails; basically, the header defines the following image properties:
4626c609719bSwdenk
4627c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4628c609719bSwdenk  4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
4629f5ed9e39SPeter Tyser  LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
4630f5ed9e39SPeter Tyser  Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
4631f5ed9e39SPeter Tyser  INTEGRITY).
46327b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
4633afc1ce82SMacpaul Lin  IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
4634afc1ce82SMacpaul Lin  Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC).
4635c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2)
4636c609719bSwdenk* Load Address
4637c609719bSwdenk* Entry Point
4638c609719bSwdenk* Image Name
4639c609719bSwdenk* Image Timestamp
4640c609719bSwdenk
4641c609719bSwdenkThe header is marked by a special Magic Number, and both the header
4642c609719bSwdenkand the data portions of the image are secured against corruption by
4643c609719bSwdenkCRC32 checksums.
4644c609719bSwdenk
4645c609719bSwdenk
4646c609719bSwdenkLinux Support:
4647c609719bSwdenk==============
4648c609719bSwdenk
4649c609719bSwdenkAlthough U-Boot should support any OS or standalone application
46507152b1d0Swdenkeasily, the main focus has always been on Linux during the design of
4651c609719bSwdenkU-Boot.
4652c609719bSwdenk
4653c609719bSwdenkU-Boot includes many features that so far have been part of some
4654c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any
4655c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image;
4656c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation
46577152b1d0Swdenkserves several purposes:
4658c609719bSwdenk
4659c609719bSwdenk- the same features can be used for other OS or standalone
4660c609719bSwdenk  applications (for instance: using compressed images to reduce the
4661c609719bSwdenk  Flash memory footprint)
4662c609719bSwdenk
4663c609719bSwdenk- it becomes much easier to port new Linux kernel versions because
46647152b1d0Swdenk  lots of low-level, hardware dependent stuff are done by U-Boot
4665c609719bSwdenk
4666c609719bSwdenk- the same Linux kernel image can now be used with different "initrd"
4667c609719bSwdenk  images; of course this also means that different kernel images can
4668c609719bSwdenk  be run with the same "initrd". This makes testing easier (you don't
4669c609719bSwdenk  have to build a new "zImage.initrd" Linux image when you just
4670c609719bSwdenk  change a file in your "initrd"). Also, a field-upgrade of the
4671c609719bSwdenk  software is easier now.
4672c609719bSwdenk
4673c609719bSwdenk
4674c609719bSwdenkLinux HOWTO:
4675c609719bSwdenk============
4676c609719bSwdenk
4677c609719bSwdenkPorting Linux to U-Boot based systems:
4678c609719bSwdenk---------------------------------------
4679c609719bSwdenk
4680c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to
4681c609719bSwdenkconfigure the Linux device drivers for use with your target hardware
4682c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to
4683c609719bSwdenkLinux :-).
4684c609719bSwdenk
4685a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot).
4686c609719bSwdenk
4687c609719bSwdenkJust make sure your machine specific header file (for instance
4688c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board
46891dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h,
46901dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value
46916d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR.
4692c609719bSwdenk
4693c609719bSwdenk
4694c609719bSwdenkConfiguring the Linux kernel:
4695c609719bSwdenk-----------------------------
4696c609719bSwdenk
4697c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root
4698c609719bSwdenkdevice (initial ramdisk, NFS) for your target system.
4699c609719bSwdenk
4700c609719bSwdenk
4701c609719bSwdenkBuilding a Linux Image:
4702c609719bSwdenk-----------------------
4703c609719bSwdenk
470424ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are
470524ee89b9Swdenknot used. If you use recent kernel source, a new build target
470624ee89b9Swdenk"uImage" will exist which automatically builds an image usable by
470724ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target,
470824ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a
470924ee89b9Swdenk100% compatible format.
4710c609719bSwdenk
4711c609719bSwdenkExample:
4712c609719bSwdenk
4713c609719bSwdenk	make TQM850L_config
4714c609719bSwdenk	make oldconfig
4715c609719bSwdenk	make dep
471624ee89b9Swdenk	make uImage
4717c609719bSwdenk
471824ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to
471924ee89b9Swdenkencapsulate a compressed Linux kernel image with header	 information,
472024ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing:
4721c609719bSwdenk
472224ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format):
472324ee89b9Swdenk
472424ee89b9Swdenk* convert the kernel into a raw binary image:
472524ee89b9Swdenk
472624ee89b9Swdenk	${CROSS_COMPILE}-objcopy -O binary \
472724ee89b9Swdenk				 -R .note -R .comment \
472824ee89b9Swdenk				 -S vmlinux linux.bin
472924ee89b9Swdenk
473024ee89b9Swdenk* compress the binary image:
473124ee89b9Swdenk
473224ee89b9Swdenk	gzip -9 linux.bin
473324ee89b9Swdenk
473424ee89b9Swdenk* package compressed binary image for U-Boot:
473524ee89b9Swdenk
473624ee89b9Swdenk	mkimage -A ppc -O linux -T kernel -C gzip \
473724ee89b9Swdenk		-a 0 -e 0 -n "Linux Kernel Image" \
473824ee89b9Swdenk		-d linux.bin.gz uImage
473924ee89b9Swdenk
474024ee89b9Swdenk
474124ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use
474224ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or
474324ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64
474424ee89b9Swdenkbyte header containing information about target architecture,
474524ee89b9Swdenkoperating system, image type, compression method, entry points, time
474624ee89b9Swdenkstamp, CRC32 checksums, etc.
474724ee89b9Swdenk
474824ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and
474924ee89b9Swdenkprint the header information, or to build new images.
4750c609719bSwdenk
4751c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information
4752c609719bSwdenkcontained in the header of an existing U-Boot image; this includes
4753c609719bSwdenkchecksum verification:
4754c609719bSwdenk
4755c609719bSwdenk	tools/mkimage -l image
4756c609719bSwdenk	  -l ==> list image header information
4757c609719bSwdenk
4758c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image
4759c609719bSwdenkfrom a "data file" which is used as image payload:
4760c609719bSwdenk
4761c609719bSwdenk	tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \
4762c609719bSwdenk		      -n name -d data_file image
4763c609719bSwdenk	  -A ==> set architecture to 'arch'
4764c609719bSwdenk	  -O ==> set operating system to 'os'
4765c609719bSwdenk	  -T ==> set image type to 'type'
4766c609719bSwdenk	  -C ==> set compression type 'comp'
4767c609719bSwdenk	  -a ==> set load address to 'addr' (hex)
4768c609719bSwdenk	  -e ==> set entry point to 'ep' (hex)
4769c609719bSwdenk	  -n ==> set image name to 'name'
4770c609719bSwdenk	  -d ==> use image data from 'datafile'
4771c609719bSwdenk
477269459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load
477369459791Swdenkaddress (0x00000000), but the entry point address depends on the
477469459791Swdenkkernel version:
4775c609719bSwdenk
4776c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C,
477724ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000.
4778c609719bSwdenk
4779c609719bSwdenkSo a typical call to build a U-Boot image would read:
4780c609719bSwdenk
478124ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
478224ee89b9Swdenk	> -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \
4783a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \
478424ee89b9Swdenk	> examples/uImage.TQM850L
478524ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4786c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4787c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4788c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4789c609719bSwdenk	Load Address: 0x00000000
479024ee89b9Swdenk	Entry Point:  0x00000000
4791c609719bSwdenk
4792c609719bSwdenkTo verify the contents of the image (or check for corruption):
4793c609719bSwdenk
479424ee89b9Swdenk	-> tools/mkimage -l examples/uImage.TQM850L
479524ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4796c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4797c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (gzip compressed)
4798c609719bSwdenk	Data Size:    335725 Bytes = 327.86 kB = 0.32 MB
4799c609719bSwdenk	Load Address: 0x00000000
480024ee89b9Swdenk	Entry Point:  0x00000000
4801c609719bSwdenk
4802c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade
4803c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this
4804c609719bSwdenkneeds more space in Flash, but boots much faster since it does not
4805c609719bSwdenkneed to be uncompressed:
4806c609719bSwdenk
4807a47a12beSStefan Roese	-> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz
480824ee89b9Swdenk	-> tools/mkimage -n '2.4.4 kernel for TQM850L' \
480924ee89b9Swdenk	> -A ppc -O linux -T kernel -C none -a 0 -e 0 \
4810a47a12beSStefan Roese	> -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \
481124ee89b9Swdenk	> examples/uImage.TQM850L-uncompressed
481224ee89b9Swdenk	Image Name:   2.4.4 kernel for TQM850L
4813c609719bSwdenk	Created:      Wed Jul 19 02:34:59 2000
4814c609719bSwdenk	Image Type:   PowerPC Linux Kernel Image (uncompressed)
4815c609719bSwdenk	Data Size:    792160 Bytes = 773.59 kB = 0.76 MB
4816c609719bSwdenk	Load Address: 0x00000000
481724ee89b9Swdenk	Entry Point:  0x00000000
4818c609719bSwdenk
4819c609719bSwdenk
4820c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file
4821c609719bSwdenkwhen your kernel is intended to use an initial ramdisk:
4822c609719bSwdenk
4823c609719bSwdenk	-> tools/mkimage -n 'Simple Ramdisk Image' \
4824c609719bSwdenk	> -A ppc -O linux -T ramdisk -C gzip \
4825c609719bSwdenk	> -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd
4826c609719bSwdenk	Image Name:   Simple Ramdisk Image
4827c609719bSwdenk	Created:      Wed Jan 12 14:01:50 2000
4828c609719bSwdenk	Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
4829c609719bSwdenk	Data Size:    566530 Bytes = 553.25 kB = 0.54 MB
4830c609719bSwdenk	Load Address: 0x00000000
4831c609719bSwdenk	Entry Point:  0x00000000
4832c609719bSwdenk
4833c609719bSwdenk
4834c609719bSwdenkInstalling a Linux Image:
4835c609719bSwdenk-------------------------
4836c609719bSwdenk
4837c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface,
4838c609719bSwdenkyou must convert the image to S-Record format:
4839c609719bSwdenk
4840c609719bSwdenk	objcopy -I binary -O srec examples/image examples/image.srec
4841c609719bSwdenk
4842c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot
4843c609719bSwdenkimage header, so the resulting S-Record file will be relative to
4844c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to
4845c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads'
4846c609719bSwdenkcommand.
4847c609719bSwdenk
4848c609719bSwdenkExample: install the image to address 0x40100000 (which on the
4849c609719bSwdenkTQM8xxL is in the first Flash bank):
4850c609719bSwdenk
4851c609719bSwdenk	=> erase 40100000 401FFFFF
4852c609719bSwdenk
4853c609719bSwdenk	.......... done
4854c609719bSwdenk	Erased 8 sectors
4855c609719bSwdenk
4856c609719bSwdenk	=> loads 40100000
4857c609719bSwdenk	## Ready for S-Record download ...
4858c609719bSwdenk	~>examples/image.srec
4859c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 12 13 ...
4860c609719bSwdenk	...
4861c609719bSwdenk	15989 15990 15991 15992
4862c609719bSwdenk	[file transfer complete]
4863c609719bSwdenk	[connected]
4864c609719bSwdenk	## Start Addr = 0x00000000
4865c609719bSwdenk
4866c609719bSwdenk
4867c609719bSwdenkYou can check the success of the download using the 'iminfo' command;
4868c609719bSwdenkthis includes a checksum verification so you can be sure no data
4869c609719bSwdenkcorruption happened:
4870c609719bSwdenk
4871c609719bSwdenk	=> imi 40100000
4872c609719bSwdenk
4873c609719bSwdenk	## Checking Image at 40100000 ...
4874c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4875c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4876c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4877c609719bSwdenk	   Load Address: 00000000
4878c609719bSwdenk	   Entry Point:	 0000000c
4879c609719bSwdenk	   Verifying Checksum ... OK
4880c609719bSwdenk
4881c609719bSwdenk
4882c609719bSwdenkBoot Linux:
4883c609719bSwdenk-----------
4884c609719bSwdenk
4885c609719bSwdenkThe "bootm" command is used to boot an application that is stored in
4886c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents
4887c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as
4888c609719bSwdenkparameters. You can check and modify this variable using the
4889c609719bSwdenk"printenv" and "setenv" commands:
4890c609719bSwdenk
4891c609719bSwdenk
4892c609719bSwdenk	=> printenv bootargs
4893c609719bSwdenk	bootargs=root=/dev/ram
4894c609719bSwdenk
4895c609719bSwdenk	=> setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4896c609719bSwdenk
4897c609719bSwdenk	=> printenv bootargs
4898c609719bSwdenk	bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4899c609719bSwdenk
4900c609719bSwdenk	=> bootm 40020000
4901c609719bSwdenk	## Booting Linux kernel at 40020000 ...
4902c609719bSwdenk	   Image Name:	 2.2.13 for NFS on TQM850L
4903c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4904c609719bSwdenk	   Data Size:	 381681 Bytes = 372 kB = 0 MB
4905c609719bSwdenk	   Load Address: 00000000
4906c609719bSwdenk	   Entry Point:	 0000000c
4907c609719bSwdenk	   Verifying Checksum ... OK
4908c609719bSwdenk	   Uncompressing Kernel Image ... OK
4909c609719bSwdenk	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
4910c609719bSwdenk	Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2
4911c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4912c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4913c609719bSwdenk	Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
4914c609719bSwdenk	...
4915c609719bSwdenk
491611ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass
49177152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT
4918c609719bSwdenkformat!) to the "bootm" command:
4919c609719bSwdenk
4920c609719bSwdenk	=> imi 40100000 40200000
4921c609719bSwdenk
4922c609719bSwdenk	## Checking Image at 40100000 ...
4923c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4924c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4925c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4926c609719bSwdenk	   Load Address: 00000000
4927c609719bSwdenk	   Entry Point:	 0000000c
4928c609719bSwdenk	   Verifying Checksum ... OK
4929c609719bSwdenk
4930c609719bSwdenk	## Checking Image at 40200000 ...
4931c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4932c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4933c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4934c609719bSwdenk	   Load Address: 00000000
4935c609719bSwdenk	   Entry Point:	 00000000
4936c609719bSwdenk	   Verifying Checksum ... OK
4937c609719bSwdenk
4938c609719bSwdenk	=> bootm 40100000 40200000
4939c609719bSwdenk	## Booting Linux kernel at 40100000 ...
4940c609719bSwdenk	   Image Name:	 2.2.13 for initrd on TQM850L
4941c609719bSwdenk	   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
4942c609719bSwdenk	   Data Size:	 335725 Bytes = 327 kB = 0 MB
4943c609719bSwdenk	   Load Address: 00000000
4944c609719bSwdenk	   Entry Point:	 0000000c
4945c609719bSwdenk	   Verifying Checksum ... OK
4946c609719bSwdenk	   Uncompressing Kernel Image ... OK
4947c609719bSwdenk	## Loading RAMDisk Image at 40200000 ...
4948c609719bSwdenk	   Image Name:	 Simple Ramdisk Image
4949c609719bSwdenk	   Image Type:	 PowerPC Linux RAMDisk Image (gzip compressed)
4950c609719bSwdenk	   Data Size:	 566530 Bytes = 553 kB = 0 MB
4951c609719bSwdenk	   Load Address: 00000000
4952c609719bSwdenk	   Entry Point:	 00000000
4953c609719bSwdenk	   Verifying Checksum ... OK
4954c609719bSwdenk	   Loading Ramdisk ... OK
4955c609719bSwdenk	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
4956c609719bSwdenk	Boot arguments: root=/dev/ram
4957c609719bSwdenk	time_init: decrementer frequency = 187500000/60
4958c609719bSwdenk	Calibrating delay loop... 49.77 BogoMIPS
4959c609719bSwdenk	...
4960c609719bSwdenk	RAMDISK: Compressed image found at block 0
4961c609719bSwdenk	VFS: Mounted root (ext2 filesystem).
4962c609719bSwdenk
4963c609719bSwdenk	bash#
4964c609719bSwdenk
49650267768eSMatthew McClintockBoot Linux and pass a flat device tree:
49660267768eSMatthew McClintock-----------
49670267768eSMatthew McClintock
49680267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section
49690267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The
49700267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated
49710267768eSMatthew McClintockflat device tree:
49720267768eSMatthew McClintock
49730267768eSMatthew McClintock=> print oftaddr
49740267768eSMatthew McClintockoftaddr=0x300000
49750267768eSMatthew McClintock=> print oft
49760267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb
49770267768eSMatthew McClintock=> tftp $oftaddr $oft
49780267768eSMatthew McClintockSpeed: 1000, full duplex
49790267768eSMatthew McClintockUsing TSEC0 device
49800267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101
49810267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'.
49820267768eSMatthew McClintockLoad address: 0x300000
49830267768eSMatthew McClintockLoading: #
49840267768eSMatthew McClintockdone
49850267768eSMatthew McClintockBytes transferred = 4106 (100a hex)
49860267768eSMatthew McClintock=> tftp $loadaddr $bootfile
49870267768eSMatthew McClintockSpeed: 1000, full duplex
49880267768eSMatthew McClintockUsing TSEC0 device
49890267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2
49900267768eSMatthew McClintockFilename 'uImage'.
49910267768eSMatthew McClintockLoad address: 0x200000
49920267768eSMatthew McClintockLoading:############
49930267768eSMatthew McClintockdone
49940267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex)
49950267768eSMatthew McClintock=> print loadaddr
49960267768eSMatthew McClintockloadaddr=200000
49970267768eSMatthew McClintock=> print oftaddr
49980267768eSMatthew McClintockoftaddr=0x300000
49990267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr
50000267768eSMatthew McClintock## Booting image at 00200000 ...
50010267768eSMatthew McClintock   Image Name:	 Linux-2.6.17-dirty
50020267768eSMatthew McClintock   Image Type:	 PowerPC Linux Kernel Image (gzip compressed)
50030267768eSMatthew McClintock   Data Size:	 1029343 Bytes = 1005.2 kB
50040267768eSMatthew McClintock   Load Address: 00000000
50050267768eSMatthew McClintock   Entry Point:	 00000000
50060267768eSMatthew McClintock   Verifying Checksum ... OK
50070267768eSMatthew McClintock   Uncompressing Kernel Image ... OK
50080267768eSMatthew McClintockBooting using flat device tree at 0x300000
50090267768eSMatthew McClintockUsing MPC85xx ADS machine description
50100267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb
50110267768eSMatthew McClintock[snip]
50120267768eSMatthew McClintock
50130267768eSMatthew McClintock
50146069ff26SwdenkMore About U-Boot Image Types:
50156069ff26Swdenk------------------------------
50166069ff26Swdenk
50176069ff26SwdenkU-Boot supports the following image types:
50186069ff26Swdenk
50196069ff26Swdenk   "Standalone Programs" are directly runnable in the environment
50206069ff26Swdenk	provided by U-Boot; it is expected that (if they behave
50216069ff26Swdenk	well) you can continue to work in U-Boot after return from
50226069ff26Swdenk	the Standalone Program.
50236069ff26Swdenk   "OS Kernel Images" are usually images of some Embedded OS which
50246069ff26Swdenk	will take over control completely. Usually these programs
50256069ff26Swdenk	will install their own set of exception handlers, device
50266069ff26Swdenk	drivers, set up the MMU, etc. - this means, that you cannot
50276069ff26Swdenk	expect to re-enter U-Boot except by resetting the CPU.
50286069ff26Swdenk   "RAMDisk Images" are more or less just data blocks, and their
50296069ff26Swdenk	parameters (address, size) are passed to an OS kernel that is
50306069ff26Swdenk	being started.
50316069ff26Swdenk   "Multi-File Images" contain several images, typically an OS
50326069ff26Swdenk	(Linux) kernel image and one or more data images like
50336069ff26Swdenk	RAMDisks. This construct is useful for instance when you want
50346069ff26Swdenk	to boot over the network using BOOTP etc., where the boot
50356069ff26Swdenk	server provides just a single image file, but you want to get
50366069ff26Swdenk	for instance an OS kernel and a RAMDisk image.
50376069ff26Swdenk
50386069ff26Swdenk	"Multi-File Images" start with a list of image sizes, each
50396069ff26Swdenk	image size (in bytes) specified by an "uint32_t" in network
50406069ff26Swdenk	byte order. This list is terminated by an "(uint32_t)0".
50416069ff26Swdenk	Immediately after the terminating 0 follow the images, one by
50426069ff26Swdenk	one, all aligned on "uint32_t" boundaries (size rounded up to
50436069ff26Swdenk	a multiple of 4 bytes).
50446069ff26Swdenk
50456069ff26Swdenk   "Firmware Images" are binary images containing firmware (like
50466069ff26Swdenk	U-Boot or FPGA images) which usually will be programmed to
50476069ff26Swdenk	flash memory.
50486069ff26Swdenk
50496069ff26Swdenk   "Script files" are command sequences that will be executed by
50506069ff26Swdenk	U-Boot's command interpreter; this feature is especially
50516069ff26Swdenk	useful when you configure U-Boot to use a real shell (hush)
50526069ff26Swdenk	as command interpreter.
50536069ff26Swdenk
505444f074c7SMarek VasutBooting the Linux zImage:
505544f074c7SMarek Vasut-------------------------
505644f074c7SMarek Vasut
505744f074c7SMarek VasutOn some platforms, it's possible to boot Linux zImage. This is done
505844f074c7SMarek Vasutusing the "bootz" command. The syntax of "bootz" command is the same
505944f074c7SMarek Vasutas the syntax of "bootm" command.
506044f074c7SMarek Vasut
5061017e1f3fSMarek VasutNote, defining the CONFIG_SUPPORT_INITRD_RAW allows user to supply
5062017e1f3fSMarek Vasutkernel with raw initrd images. The syntax is slightly different, the
5063017e1f3fSMarek Vasutaddress of the initrd must be augmented by it's size, in the following
5064017e1f3fSMarek Vasutformat: "<initrd addres>:<initrd size>".
5065017e1f3fSMarek Vasut
5066c609719bSwdenk
5067c609719bSwdenkStandalone HOWTO:
5068c609719bSwdenk=================
5069c609719bSwdenk
5070c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and
5071c609719bSwdenkrun "standalone" applications, which can use some resources of
5072c609719bSwdenkU-Boot like console I/O functions or interrupt services.
5073c609719bSwdenk
5074c609719bSwdenkTwo simple examples are included with the sources:
5075c609719bSwdenk
5076c609719bSwdenk"Hello World" Demo:
5077c609719bSwdenk-------------------
5078c609719bSwdenk
5079c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo
5080c609719bSwdenkapplication; it is automatically compiled when you build U-Boot.
5081c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it
5082c609719bSwdenklike that:
5083c609719bSwdenk
5084c609719bSwdenk	=> loads
5085c609719bSwdenk	## Ready for S-Record download ...
5086c609719bSwdenk	~>examples/hello_world.srec
5087c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5088c609719bSwdenk	[file transfer complete]
5089c609719bSwdenk	[connected]
5090c609719bSwdenk	## Start Addr = 0x00040004
5091c609719bSwdenk
5092c609719bSwdenk	=> go 40004 Hello World! This is a test.
5093c609719bSwdenk	## Starting application at 0x00040004 ...
5094c609719bSwdenk	Hello World
5095c609719bSwdenk	argc = 7
5096c609719bSwdenk	argv[0] = "40004"
5097c609719bSwdenk	argv[1] = "Hello"
5098c609719bSwdenk	argv[2] = "World!"
5099c609719bSwdenk	argv[3] = "This"
5100c609719bSwdenk	argv[4] = "is"
5101c609719bSwdenk	argv[5] = "a"
5102c609719bSwdenk	argv[6] = "test."
5103c609719bSwdenk	argv[7] = "<NULL>"
5104c609719bSwdenk	Hit any key to exit ...
5105c609719bSwdenk
5106c609719bSwdenk	## Application terminated, rc = 0x0
5107c609719bSwdenk
5108c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt
5109c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'.
5110c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second.
5111c609719bSwdenkThe interrupt service routine is trivial, just printing a '.'
5112c609719bSwdenkcharacter, but this is just a demo program. The application can be
5113c609719bSwdenkcontrolled by the following keys:
5114c609719bSwdenk
5115c609719bSwdenk	? - print current values og the CPM Timer registers
5116c609719bSwdenk	b - enable interrupts and start timer
5117c609719bSwdenk	e - stop timer and disable interrupts
5118c609719bSwdenk	q - quit application
5119c609719bSwdenk
5120c609719bSwdenk	=> loads
5121c609719bSwdenk	## Ready for S-Record download ...
5122c609719bSwdenk	~>examples/timer.srec
5123c609719bSwdenk	1 2 3 4 5 6 7 8 9 10 11 ...
5124c609719bSwdenk	[file transfer complete]
5125c609719bSwdenk	[connected]
5126c609719bSwdenk	## Start Addr = 0x00040004
5127c609719bSwdenk
5128c609719bSwdenk	=> go 40004
5129c609719bSwdenk	## Starting application at 0x00040004 ...
5130c609719bSwdenk	TIMERS=0xfff00980
5131c609719bSwdenk	Using timer 1
5132c609719bSwdenk	  tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0
5133c609719bSwdenk
5134c609719bSwdenkHit 'b':
5135c609719bSwdenk	[q, b, e, ?] Set interval 1000000 us
5136c609719bSwdenk	Enabling timer
5137c609719bSwdenkHit '?':
5138c609719bSwdenk	[q, b, e, ?] ........
5139c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0
5140c609719bSwdenkHit '?':
5141c609719bSwdenk	[q, b, e, ?] .
5142c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0
5143c609719bSwdenkHit '?':
5144c609719bSwdenk	[q, b, e, ?] .
5145c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0
5146c609719bSwdenkHit '?':
5147c609719bSwdenk	[q, b, e, ?] .
5148c609719bSwdenk	tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0
5149c609719bSwdenkHit 'e':
5150c609719bSwdenk	[q, b, e, ?] ...Stopping timer
5151c609719bSwdenkHit 'q':
5152c609719bSwdenk	[q, b, e, ?] ## Application terminated, rc = 0x0
5153c609719bSwdenk
5154c609719bSwdenk
515585ec0bccSwdenkMinicom warning:
515685ec0bccSwdenk================
515785ec0bccSwdenk
51587152b1d0SwdenkOver time, many people have reported problems when trying to use the
515985ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd)
516085ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under
5161f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and
516285ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and
5163e53515a2SKarl O. Pincuse "cu" for S-Record download ("loads" command).  See
5164e53515a2SKarl O. Pinchttp://www.denx.de/wiki/view/DULG/SystemSetup#Section_4.3.
5165e53515a2SKarl O. Pincfor help with kermit.
5166e53515a2SKarl O. Pinc
516785ec0bccSwdenk
516852f52c14SwdenkNevertheless, if you absolutely want to use it try adding this
516952f52c14Swdenkconfiguration to your "File transfer protocols" section:
517052f52c14Swdenk
517152f52c14Swdenk	   Name	   Program			Name U/D FullScr IO-Red. Multi
517252f52c14Swdenk	X  kermit  /usr/bin/kermit -i -l %l -s	 Y    U	   Y	   N	  N
517352f52c14Swdenk	Y  kermit  /usr/bin/kermit -i -l %l -r	 N    D	   Y	   N	  N
517452f52c14Swdenk
517552f52c14Swdenk
5176c609719bSwdenkNetBSD Notes:
5177c609719bSwdenk=============
5178c609719bSwdenk
5179c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host
5180c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx).
5181c609719bSwdenk
5182c609719bSwdenkBuilding requires a cross environment; it is known to work on
5183c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also
5184c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make).
5185c609719bSwdenkNote that the cross-powerpc package does not install include files;
5186c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is
5187c609719bSwdenkmissing.  This file has to be installed and patched manually:
5188c609719bSwdenk
5189c609719bSwdenk	# cd /usr/pkg/cross/powerpc-netbsd/include
5190c609719bSwdenk	# mkdir powerpc
5191c609719bSwdenk	# ln -s powerpc machine
5192c609719bSwdenk	# cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h
5193c609719bSwdenk	# ${EDIT} powerpc/ansi.h	## must remove __va_list, _BSD_VA_LIST
5194c609719bSwdenk
5195c609719bSwdenkNative builds *don't* work due to incompatibilities between native
5196c609719bSwdenkand U-Boot include files.
5197c609719bSwdenk
5198c609719bSwdenkBooting assumes that (the first part of) the image booted is a
5199c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel
5200c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source
5201c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the
52022a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz
5203c609719bSwdenk
5204c609719bSwdenk
5205c609719bSwdenkImplementation Internals:
5206c609719bSwdenk=========================
5207c609719bSwdenk
5208c609719bSwdenkThe following is not intended to be a complete description of every
5209c609719bSwdenkimplementation detail. However, it should help to understand the
5210c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom
5211c609719bSwdenkhardware.
5212c609719bSwdenk
5213c609719bSwdenk
5214c609719bSwdenkInitial Stack, Global Data:
5215c609719bSwdenk---------------------------
5216c609719bSwdenk
5217c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot
5218c609719bSwdenkstarts running out of ROM (flash memory), usually without access to
5219c609719bSwdenksystem RAM (because the memory controller is not initialized yet).
5220c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS
5221c609719bSwdenkis not initialized as zero. To be able to get a C environment working
5222c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation
5223c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU
5224c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and
5225c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be
5226c609719bSwdenklocked as (mis-) used as memory, etc.
5227c609719bSwdenk
52287152b1d0Swdenk	Chris Hallinan posted a good summary of these issues to the
52290668236bSWolfgang Denk	U-Boot mailing list:
523043d9616cSwdenk
523143d9616cSwdenk	Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)?
523243d9616cSwdenk	From: "Chris Hallinan" <clh@net1plus.com>
523343d9616cSwdenk	Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET)
523443d9616cSwdenk	...
523543d9616cSwdenk
523643d9616cSwdenk	Correct me if I'm wrong, folks, but the way I understand it
523743d9616cSwdenk	is this: Using DCACHE as initial RAM for Stack, etc, does not
523843d9616cSwdenk	require any physical RAM backing up the cache. The cleverness
523943d9616cSwdenk	is that the cache is being used as a temporary supply of
524043d9616cSwdenk	necessary storage before the SDRAM controller is setup. It's
524111ccc33fSMarcel Ziswiler	beyond the scope of this list to explain the details, but you
524243d9616cSwdenk	can see how this works by studying the cache architecture and
524343d9616cSwdenk	operation in the architecture and processor-specific manuals.
524443d9616cSwdenk
524543d9616cSwdenk	OCM is On Chip Memory, which I believe the 405GP has 4K. It
524643d9616cSwdenk	is another option for the system designer to use as an
524711ccc33fSMarcel Ziswiler	initial stack/RAM area prior to SDRAM being available. Either
524843d9616cSwdenk	option should work for you. Using CS 4 should be fine if your
524943d9616cSwdenk	board designers haven't used it for something that would
525043d9616cSwdenk	cause you grief during the initial boot! It is frequently not
525143d9616cSwdenk	used.
525243d9616cSwdenk
52536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD	CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere
525443d9616cSwdenk	with your processor/board/system design. The default value
525543d9616cSwdenk	you will find in any recent u-boot distribution in
52568a316c9bSStefan Roese	walnut.h should work for you. I'd set it to a value larger
525743d9616cSwdenk	than your SDRAM module. If you have a 64MB SDRAM module, set
525843d9616cSwdenk	it above 400_0000. Just make sure your board has no resources
525943d9616cSwdenk	that are supposed to respond to that address! That code in
526043d9616cSwdenk	start.S has been around a while and should work as is when
526143d9616cSwdenk	you get the config right.
526243d9616cSwdenk
526343d9616cSwdenk	-Chris Hallinan
526443d9616cSwdenk	DS4.COM, Inc.
526543d9616cSwdenk
5266c609719bSwdenkIt is essential to remember this, since it has some impact on the C
5267c609719bSwdenkcode for the initialization procedures:
5268c609719bSwdenk
5269c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt
5270c609719bSwdenk  to write it.
5271c609719bSwdenk
527211ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized
5273c609719bSwdenk  as zero data - BSS segment) at all - this is undefined, initiali-
52747152b1d0Swdenk  zation is performed later (when relocating to RAM).
5275c609719bSwdenk
5276c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like
5277c609719bSwdenk  that.
5278c609719bSwdenk
5279c609719bSwdenkHaving only the stack as writable memory limits means we cannot use
5280c609719bSwdenknormal global data to share information beween the code. But it
5281c609719bSwdenkturned out that the implementation of U-Boot can be greatly
5282c609719bSwdenksimplified by making a global data structure (gd_t) available to all
5283c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_
5284c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of
5285c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we
5286c609719bSwdenkplace a pointer (gd) to the global data into a register which we
5287c609719bSwdenkreserve for this purpose.
5288c609719bSwdenk
52897152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the
5290c609719bSwdenkrelevant  (E)ABI  specifications for the current architecture, and by
5291c609719bSwdenkGCC's implementation.
5292c609719bSwdenk
5293c609719bSwdenkFor PowerPC, the following registers have specific use:
5294c609719bSwdenk	R1:	stack pointer
5295e7670f6cSWolfgang Denk	R2:	reserved for system use
5296c609719bSwdenk	R3-R4:	parameter passing and return values
5297c609719bSwdenk	R5-R10: parameter passing
5298c609719bSwdenk	R13:	small data area pointer
5299c609719bSwdenk	R30:	GOT pointer
5300c609719bSwdenk	R31:	frame pointer
5301c609719bSwdenk
5302e6bee808SJoakim Tjernlund	(U-Boot also uses R12 as internal GOT pointer. r12
5303e6bee808SJoakim Tjernlund	is a volatile register so r12 needs to be reset when
5304e6bee808SJoakim Tjernlund	going back and forth between asm and C)
5305c609719bSwdenk
5306e7670f6cSWolfgang Denk    ==> U-Boot will use R2 to hold a pointer to the global data
5307c609719bSwdenk
5308c609719bSwdenk    Note: on PPC, we could use a static initializer (since the
5309c609719bSwdenk    address of the global data structure is known at compile time),
5310c609719bSwdenk    but it turned out that reserving a register results in somewhat
5311c609719bSwdenk    smaller code - although the code savings are not that big (on
5312c609719bSwdenk    average for all boards 752 bytes for the whole U-Boot image,
5313c609719bSwdenk    624 text + 127 data).
5314c609719bSwdenk
5315c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here:
53164c58eb55SMike Frysinger	http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface
53174c58eb55SMike Frysinger
5318c4db335cSRobin Getz    ==> U-Boot will use P3 to hold a pointer to the global data
53194c58eb55SMike Frysinger
5320c609719bSwdenkOn ARM, the following registers are used:
5321c609719bSwdenk
5322c609719bSwdenk	R0:	function argument word/integer result
5323c609719bSwdenk	R1-R3:	function argument word
5324c609719bSwdenk	R9:	GOT pointer
5325c609719bSwdenk	R10:	stack limit (used only if stack checking if enabled)
5326c609719bSwdenk	R11:	argument (frame) pointer
5327c609719bSwdenk	R12:	temporary workspace
5328c609719bSwdenk	R13:	stack pointer
5329c609719bSwdenk	R14:	link register
5330c609719bSwdenk	R15:	program counter
5331c609719bSwdenk
5332c609719bSwdenk    ==> U-Boot will use R8 to hold a pointer to the global data
5333c609719bSwdenk
53340df01fd3SThomas ChouOn Nios II, the ABI is documented here:
53350df01fd3SThomas Chou	http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf
53360df01fd3SThomas Chou
53370df01fd3SThomas Chou    ==> U-Boot will use gp to hold a pointer to the global data
53380df01fd3SThomas Chou
53390df01fd3SThomas Chou    Note: on Nios II, we give "-G0" option to gcc and don't use gp
53400df01fd3SThomas Chou    to access small data sections, so gp is free.
53410df01fd3SThomas Chou
5342afc1ce82SMacpaul LinOn NDS32, the following registers are used:
5343afc1ce82SMacpaul Lin
5344afc1ce82SMacpaul Lin	R0-R1:	argument/return
5345afc1ce82SMacpaul Lin	R2-R5:	argument
5346afc1ce82SMacpaul Lin	R15:	temporary register for assembler
5347afc1ce82SMacpaul Lin	R16:	trampoline register
5348afc1ce82SMacpaul Lin	R28:	frame pointer (FP)
5349afc1ce82SMacpaul Lin	R29:	global pointer (GP)
5350afc1ce82SMacpaul Lin	R30:	link register (LP)
5351afc1ce82SMacpaul Lin	R31:	stack pointer (SP)
5352afc1ce82SMacpaul Lin	PC:	program counter (PC)
5353afc1ce82SMacpaul Lin
5354afc1ce82SMacpaul Lin    ==> U-Boot will use R10 to hold a pointer to the global data
5355afc1ce82SMacpaul Lin
5356d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope,
5357d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much.
5358c609719bSwdenk
5359c609719bSwdenkMemory Management:
5360c609719bSwdenk------------------
5361c609719bSwdenk
5362c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the
5363c609719bSwdenkMMU is not used either for address mapping nor for memory protection.
5364c609719bSwdenk
5365c609719bSwdenkThe available memory is mapped to fixed addresses using the memory
5366c609719bSwdenkcontroller. In this process, a contiguous block is formed for each
5367c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several
5368c609719bSwdenkphysical memory banks.
5369c609719bSwdenk
5370c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on
5371c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After
5372c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself
5373c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some
53746d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN
5375c609719bSwdenkconfiguration setting]. Below that, a structure with global Board
5376c609719bSwdenkInfo data is placed, followed by the stack (growing downward).
5377c609719bSwdenk
5378c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB
5379c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF).
5380c609719bSwdenk
5381c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like
5382c609719bSwdenkthis:
5383c609719bSwdenk
5384c609719bSwdenk	0x0000 0000	Exception Vector code
5385c609719bSwdenk	      :
5386c609719bSwdenk	0x0000 1FFF
5387c609719bSwdenk	0x0000 2000	Free for Application Use
5388c609719bSwdenk	      :
5389c609719bSwdenk	      :
5390c609719bSwdenk
5391c609719bSwdenk	      :
5392c609719bSwdenk	      :
5393c609719bSwdenk	0x00FB FF20	Monitor Stack (Growing downward)
5394c609719bSwdenk	0x00FB FFAC	Board Info Data and permanent copy of global data
5395c609719bSwdenk	0x00FC 0000	Malloc Arena
5396c609719bSwdenk	      :
5397c609719bSwdenk	0x00FD FFFF
5398c609719bSwdenk	0x00FE 0000	RAM Copy of Monitor Code
5399c609719bSwdenk	...		eventually: LCD or video framebuffer
5400c609719bSwdenk	...		eventually: pRAM (Protected RAM - unchanged by reset)
5401c609719bSwdenk	0x00FF FFFF	[End of RAM]
5402c609719bSwdenk
5403c609719bSwdenk
5404c609719bSwdenkSystem Initialization:
5405c609719bSwdenk----------------------
5406c609719bSwdenk
5407c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point
540811ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset
5409c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory.
54107152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address.
5411c609719bSwdenkTo be able to implement the initialization code in C, a (small!)
5412c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs
5413c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked
5414c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core,
5415c609719bSwdenkthe caches and the SIU.
5416c609719bSwdenk
5417c609719bSwdenkNext, all (potentially) available memory banks are mapped using a
5418c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries
5419c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash
5420c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is
5421c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a
5422c609719bSwdenksimple memory test is run that determines the size of the SDRAM
5423c609719bSwdenkbanks.
5424c609719bSwdenk
5425c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of
54267152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first
5427c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address
5428c609719bSwdenk0x00000000, with any additional banks following immediately to create
5429c609719bSwdenkcontiguous memory starting from 0.
5430c609719bSwdenk
5431c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area
5432c609719bSwdenkand allocates memory for use by malloc() and for the global Board
5433c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM
5434c609719bSwdenkpages, and the final stack is set up.
5435c609719bSwdenk
5436c609719bSwdenkOnly after this relocation will you have a "normal" C environment;
5437c609719bSwdenkuntil that you are restricted in several ways, mostly because you are
5438c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a
5439c609719bSwdenknew address in RAM.
5440c609719bSwdenk
5441c609719bSwdenk
5442c609719bSwdenkU-Boot Porting Guide:
5443c609719bSwdenk----------------------
5444c609719bSwdenk
5445c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing
54466aff3115Swdenklist, October 2002]
5447c609719bSwdenk
5448c609719bSwdenk
5449c609719bSwdenkint main(int argc, char *argv[])
5450c609719bSwdenk{
5451c609719bSwdenk	sighandler_t no_more_time;
5452c609719bSwdenk
5453c609719bSwdenk	signal(SIGALRM, no_more_time);
5454c609719bSwdenk	alarm(PROJECT_DEADLINE - toSec (3 * WEEK));
5455c609719bSwdenk
5456c609719bSwdenk	if (available_money > available_manpower) {
54576c3fef28SJerry Van Baren		Pay consultant to port U-Boot;
5458c609719bSwdenk		return 0;
5459c609719bSwdenk	}
5460c609719bSwdenk
5461c609719bSwdenk	Download latest U-Boot source;
5462c609719bSwdenk
54630668236bSWolfgang Denk	Subscribe to u-boot mailing list;
54646aff3115Swdenk
54656c3fef28SJerry Van Baren	if (clueless)
5466c609719bSwdenk		email("Hi, I am new to U-Boot, how do I get started?");
5467c609719bSwdenk
5468c609719bSwdenk	while (learning) {
5469c609719bSwdenk		Read the README file in the top level directory;
54707cb22f97Swdenk		Read http://www.denx.de/twiki/bin/view/DULG/Manual;
54716c3fef28SJerry Van Baren		Read applicable doc/*.README;
5472c609719bSwdenk		Read the source, Luke;
54736c3fef28SJerry Van Baren		/* find . -name "*.[chS]" | xargs grep -i <keyword> */
5474c609719bSwdenk	}
5475c609719bSwdenk
54766c3fef28SJerry Van Baren	if (available_money > toLocalCurrency ($2500))
54776c3fef28SJerry Van Baren		Buy a BDI3000;
54786c3fef28SJerry Van Baren	else
5479c609719bSwdenk		Add a lot of aggravation and time;
5480c609719bSwdenk
54816c3fef28SJerry Van Baren	if (a similar board exists) {	/* hopefully... */
54826c3fef28SJerry Van Baren		cp -a board/<similar> board/<myboard>
54836c3fef28SJerry Van Baren		cp include/configs/<similar>.h include/configs/<myboard>.h
54846c3fef28SJerry Van Baren	} else {
5485c609719bSwdenk		Create your own board support subdirectory;
54866c3fef28SJerry Van Baren		Create your own board include/configs/<myboard>.h file;
54876c3fef28SJerry Van Baren	}
54886c3fef28SJerry Van Baren	Edit new board/<myboard> files
54896c3fef28SJerry Van Baren	Edit new include/configs/<myboard>.h
5490c609719bSwdenk
54916c3fef28SJerry Van Baren	while (!accepted) {
5492c609719bSwdenk		while (!running) {
5493c609719bSwdenk			do {
5494c609719bSwdenk				Add / modify source code;
5495c609719bSwdenk			} until (compiles);
5496c609719bSwdenk			Debug;
5497c609719bSwdenk			if (clueless)
5498c609719bSwdenk				email("Hi, I am having problems...");
5499c609719bSwdenk		}
55006c3fef28SJerry Van Baren		Send patch file to the U-Boot email list;
55016c3fef28SJerry Van Baren		if (reasonable critiques)
55026c3fef28SJerry Van Baren			Incorporate improvements from email list code review;
55036c3fef28SJerry Van Baren		else
55046c3fef28SJerry Van Baren			Defend code as written;
55056c3fef28SJerry Van Baren	}
5506c609719bSwdenk
5507c609719bSwdenk	return 0;
5508c609719bSwdenk}
5509c609719bSwdenk
5510c609719bSwdenkvoid no_more_time (int sig)
5511c609719bSwdenk{
5512c609719bSwdenk      hire_a_guru();
5513c609719bSwdenk}
5514c609719bSwdenk
5515c609719bSwdenk
5516c609719bSwdenkCoding Standards:
5517c609719bSwdenk-----------------
5518c609719bSwdenk
5519c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel
55202c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script
55217ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory.
5522c609719bSwdenk
55232c051651SDetlev ZundelSource files originating from a different project (for example the
55242c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not
55252c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those
55262c051651SDetlev Zundelsources.
55272c051651SDetlev Zundel
55282c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in
55292c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//)
55302c051651SDetlev Zundelin your code.
5531c609719bSwdenk
5532c178d3daSwdenkPlease also stick to the following formatting rules:
5533180d3f74Swdenk- remove any trailing white space
55347ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces
5535180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds
55367ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files
5537180d3f74Swdenk- do not add trailing empty lines to source files
5538180d3f74Swdenk
5539c609719bSwdenkSubmissions which do not conform to the standards may be returned
5540c609719bSwdenkwith a request to reformat the changes.
5541c609719bSwdenk
5542c609719bSwdenk
5543c609719bSwdenkSubmitting Patches:
5544c609719bSwdenk-------------------
5545c609719bSwdenk
5546c609719bSwdenkSince the number of patches for U-Boot is growing, we need to
5547c609719bSwdenkestablish some rules. Submissions which do not conform to these rules
5548c609719bSwdenkmay be rejected, even when they contain important and valuable stuff.
5549c609719bSwdenk
55500d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details.
5551218ca724SWolfgang Denk
55520668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>;
55530668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot
55540668236bSWolfgang Denk
5555c609719bSwdenkWhen you send a patch, please include the following information with
5556c609719bSwdenkit:
5557c609719bSwdenk
5558c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes
5559c609719bSwdenk  this bug. Please try to include a way of demonstrating that the
5560c609719bSwdenk  patch actually fixes something.
5561c609719bSwdenk
5562c609719bSwdenk* For new features: a description of the feature and your
5563c609719bSwdenk  implementation.
5564c609719bSwdenk
5565c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch)
5566c609719bSwdenk
5567c609719bSwdenk* For major contributions, your entry to the CREDITS file
5568c609719bSwdenk
5569c609719bSwdenk* When you add support for a new board, don't forget to add this
55707ca9296eSWolfgang Denk  board to the MAINTAINERS file, too.
5571c609719bSwdenk
5572c609719bSwdenk* If your patch adds new configuration options, don't forget to
5573c609719bSwdenk  document these in the README file.
5574c609719bSwdenk
5575218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly*
5576218ca724SWolfgang Denk  recommended) you can easily generate the patch using the
55777ca9296eSWolfgang Denk  "git format-patch". If you then use "git send-email" to send it to
5578218ca724SWolfgang Denk  the U-Boot mailing list, you will avoid most of the common problems
5579218ca724SWolfgang Denk  with some other mail clients.
5580c609719bSwdenk
5581218ca724SWolfgang Denk  If you cannot use git, use "diff -purN OLD NEW". If your version of
5582218ca724SWolfgang Denk  diff does not support these options, then get the latest version of
5583218ca724SWolfgang Denk  GNU diff.
55846dff5529Swdenk
5585218ca724SWolfgang Denk  The current directory when running this command shall be the parent
5586218ca724SWolfgang Denk  directory of the U-Boot source tree (i. e. please make sure that
5587218ca724SWolfgang Denk  your patch includes sufficient directory information for the
5588218ca724SWolfgang Denk  affected files).
5589218ca724SWolfgang Denk
5590218ca724SWolfgang Denk  We prefer patches as plain text. MIME attachments are discouraged,
5591218ca724SWolfgang Denk  and compressed attachments must not be used.
5592c609719bSwdenk
559352f52c14Swdenk* If one logical set of modifications affects or creates several
559452f52c14Swdenk  files, all these changes shall be submitted in a SINGLE patch file.
559552f52c14Swdenk
559652f52c14Swdenk* Changesets that contain different, unrelated modifications shall be
559752f52c14Swdenk  submitted as SEPARATE patches, one patch per changeset.
559852f52c14Swdenk
559952f52c14Swdenk
5600c609719bSwdenkNotes:
5601c609719bSwdenk
5602c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched
5603c609719bSwdenk  source tree and make sure that no errors or warnings are reported
5604c609719bSwdenk  for any of the boards.
5605c609719bSwdenk
5606c609719bSwdenk* Keep your modifications to the necessary minimum: A patch
5607c609719bSwdenk  containing several unrelated changes or arbitrary reformats will be
5608c609719bSwdenk  returned with a request to re-formatting / split it.
5609c609719bSwdenk
5610c609719bSwdenk* If you modify existing code, make sure that your new code does not
5611c609719bSwdenk  add to the memory footprint of the code ;-) Small is beautiful!
5612c609719bSwdenk  When adding new features, these should compile conditionally only
5613c609719bSwdenk  (using #ifdef), and the resulting code with the new feature
5614c609719bSwdenk  disabled must not need more memory than the old code without your
5615c609719bSwdenk  modification.
561690dc6704Swdenk
56170668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the
56180668236bSWolfgang Denk  u-boot mailing list. Bigger patches will be moderated. If they are
56190668236bSWolfgang Denk  reasonable and not too big, they will be acknowledged. But patches
56200668236bSWolfgang Denk  bigger than the size limit should be avoided.
5621