1c609719bSwdenk# 26abe6fb6SDetlev Zundel# (C) Copyright 2000 - 2011 3c609719bSwdenk# Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4c609719bSwdenk# 5c609719bSwdenk# See file CREDITS for list of people who contributed to this 6c609719bSwdenk# project. 7c609719bSwdenk# 8c609719bSwdenk# This program is free software; you can redistribute it and/or 9c609719bSwdenk# modify it under the terms of the GNU General Public License as 10c609719bSwdenk# published by the Free Software Foundation; either version 2 of 11c609719bSwdenk# the License, or (at your option) any later version. 12c609719bSwdenk# 13c609719bSwdenk# This program is distributed in the hope that it will be useful, 14c609719bSwdenk# but WITHOUT ANY WARRANTY; without even the implied warranty of 15c609719bSwdenk# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16c609719bSwdenk# GNU General Public License for more details. 17c609719bSwdenk# 18c609719bSwdenk# You should have received a copy of the GNU General Public License 19c609719bSwdenk# along with this program; if not, write to the Free Software 20c609719bSwdenk# Foundation, Inc., 59 Temple Place, Suite 330, Boston, 21c609719bSwdenk# MA 02111-1307 USA 22c609719bSwdenk# 23c609719bSwdenk 24c609719bSwdenkSummary: 25c609719bSwdenk======== 26c609719bSwdenk 2724ee89b9SwdenkThis directory contains the source code for U-Boot, a boot loader for 28e86e5a07SwdenkEmbedded boards based on PowerPC, ARM, MIPS and several other 29e86e5a07Swdenkprocessors, which can be installed in a boot ROM and used to 30e86e5a07Swdenkinitialize and test the hardware or to download and run application 31e86e5a07Swdenkcode. 32c609719bSwdenk 33c609719bSwdenkThe development of U-Boot is closely related to Linux: some parts of 3424ee89b9Swdenkthe source code originate in the Linux source tree, we have some 3524ee89b9Swdenkheader files in common, and special provision has been made to 36c609719bSwdenksupport booting of Linux images. 37c609719bSwdenk 38c609719bSwdenkSome attention has been paid to make this software easily 39c609719bSwdenkconfigurable and extendable. For instance, all monitor commands are 40c609719bSwdenkimplemented with the same call interface, so that it's very easy to 41c609719bSwdenkadd new commands. Also, instead of permanently adding rarely used 42c609719bSwdenkcode (for instance hardware test utilities) to the monitor, you can 43c609719bSwdenkload and run it dynamically. 44c609719bSwdenk 45c609719bSwdenk 46c609719bSwdenkStatus: 47c609719bSwdenk======= 48c609719bSwdenk 49c609719bSwdenkIn general, all boards for which a configuration option exists in the 50c609719bSwdenkMakefile have been tested to some extent and can be considered 51c609719bSwdenk"working". In fact, many of them are used in production systems. 52c609719bSwdenk 53c609719bSwdenkIn case of problems see the CHANGELOG and CREDITS files to find out 54218ca724SWolfgang Denkwho contributed the specific port. The MAINTAINERS file lists board 55218ca724SWolfgang Denkmaintainers. 56c609719bSwdenk 57c609719bSwdenk 58c609719bSwdenkWhere to get help: 59c609719bSwdenk================== 60c609719bSwdenk 61c609719bSwdenkIn case you have questions about, problems with or contributions for 62c609719bSwdenkU-Boot you should send a message to the U-Boot mailing list at 630c32565fSPeter Tyser<u-boot@lists.denx.de>. There is also an archive of previous traffic 640c32565fSPeter Tyseron the mailing list - please search the archive before asking FAQ's. 650c32565fSPeter TyserPlease see http://lists.denx.de/pipermail/u-boot and 660c32565fSPeter Tyserhttp://dir.gmane.org/gmane.comp.boot-loaders.u-boot 67c609719bSwdenk 68c609719bSwdenk 69218ca724SWolfgang DenkWhere to get source code: 70218ca724SWolfgang Denk========================= 71218ca724SWolfgang Denk 72218ca724SWolfgang DenkThe U-Boot source code is maintained in the git repository at 73218ca724SWolfgang Denkgit://www.denx.de/git/u-boot.git ; you can browse it online at 74218ca724SWolfgang Denkhttp://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary 75218ca724SWolfgang Denk 76218ca724SWolfgang DenkThe "snapshot" links on this page allow you to download tarballs of 7711ccc33fSMarcel Ziswilerany version you might be interested in. Official releases are also 78218ca724SWolfgang Denkavailable for FTP download from the ftp://ftp.denx.de/pub/u-boot/ 79218ca724SWolfgang Denkdirectory. 80218ca724SWolfgang Denk 81d4ee711dSAnatolij GustschinPre-built (and tested) images are available from 82218ca724SWolfgang Denkftp://ftp.denx.de/pub/u-boot/images/ 83218ca724SWolfgang Denk 84218ca724SWolfgang Denk 85c609719bSwdenkWhere we come from: 86c609719bSwdenk=================== 87c609719bSwdenk 88c609719bSwdenk- start from 8xxrom sources 8924ee89b9Swdenk- create PPCBoot project (http://sourceforge.net/projects/ppcboot) 90c609719bSwdenk- clean up code 91c609719bSwdenk- make it easier to add custom boards 92c609719bSwdenk- make it possible to add other [PowerPC] CPUs 93c609719bSwdenk- extend functions, especially: 94c609719bSwdenk * Provide extended interface to Linux boot loader 95c609719bSwdenk * S-Record download 96c609719bSwdenk * network boot 9711ccc33fSMarcel Ziswiler * PCMCIA / CompactFlash / ATA disk / SCSI ... boot 9824ee89b9Swdenk- create ARMBoot project (http://sourceforge.net/projects/armboot) 99c609719bSwdenk- add other CPU families (starting with ARM) 10024ee89b9Swdenk- create U-Boot project (http://sourceforge.net/projects/u-boot) 1010d28f34bSMagnus Lilja- current project page: see http://www.denx.de/wiki/U-Boot 10224ee89b9Swdenk 10324ee89b9Swdenk 10424ee89b9SwdenkNames and Spelling: 10524ee89b9Swdenk=================== 10624ee89b9Swdenk 10724ee89b9SwdenkThe "official" name of this project is "Das U-Boot". The spelling 10824ee89b9Swdenk"U-Boot" shall be used in all written text (documentation, comments 10924ee89b9Swdenkin source files etc.). Example: 11024ee89b9Swdenk 11124ee89b9Swdenk This is the README file for the U-Boot project. 11224ee89b9Swdenk 11324ee89b9SwdenkFile names etc. shall be based on the string "u-boot". Examples: 11424ee89b9Swdenk 11524ee89b9Swdenk include/asm-ppc/u-boot.h 11624ee89b9Swdenk 11724ee89b9Swdenk #include <asm/u-boot.h> 11824ee89b9Swdenk 11924ee89b9SwdenkVariable names, preprocessor constants etc. shall be either based on 12024ee89b9Swdenkthe string "u_boot" or on "U_BOOT". Example: 12124ee89b9Swdenk 12224ee89b9Swdenk U_BOOT_VERSION u_boot_logo 12324ee89b9Swdenk IH_OS_U_BOOT u_boot_hush_start 124c609719bSwdenk 125c609719bSwdenk 12693f19cc0SwdenkVersioning: 12793f19cc0Swdenk=========== 12893f19cc0Swdenk 129360d883aSThomas WeberStarting with the release in October 2008, the names of the releases 130360d883aSThomas Weberwere changed from numerical release numbers without deeper meaning 131360d883aSThomas Weberinto a time stamp based numbering. Regular releases are identified by 132360d883aSThomas Webernames consisting of the calendar year and month of the release date. 133360d883aSThomas WeberAdditional fields (if present) indicate release candidates or bug fix 134360d883aSThomas Weberreleases in "stable" maintenance trees. 13593f19cc0Swdenk 136360d883aSThomas WeberExamples: 137360d883aSThomas Weber U-Boot v2009.11 - Release November 2009 138360d883aSThomas Weber U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree 139360d883aSThomas Weber U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release 14093f19cc0Swdenk 14193f19cc0Swdenk 142c609719bSwdenkDirectory Hierarchy: 143c609719bSwdenk==================== 144c609719bSwdenk 1458d321b81SPeter Tyser/arch Architecture specific files 1468d321b81SPeter Tyser /arm Files generic to ARM architecture 1478d321b81SPeter Tyser /cpu CPU specific files 1488d321b81SPeter Tyser /arm720t Files specific to ARM 720 CPUs 1498d321b81SPeter Tyser /arm920t Files specific to ARM 920 CPUs 1506eb0921aSAndreas Bießmann /at91 Files specific to Atmel AT91RM9200 CPU 1518d321b81SPeter Tyser /imx Files specific to Freescale MC9328 i.MX CPUs 1528d321b81SPeter Tyser /s3c24x0 Files specific to Samsung S3C24X0 CPUs 1538d321b81SPeter Tyser /arm925t Files specific to ARM 925 CPUs 1548d321b81SPeter Tyser /arm926ejs Files specific to ARM 926 CPUs 1558d321b81SPeter Tyser /arm1136 Files specific to ARM 1136 CPUs 1568d321b81SPeter Tyser /ixp Files specific to Intel XScale IXP CPUs 1578d321b81SPeter Tyser /pxa Files specific to Intel XScale PXA CPUs 1588d321b81SPeter Tyser /s3c44b0 Files specific to Samsung S3C44B0 CPUs 1598d321b81SPeter Tyser /sa1100 Files specific to Intel StrongARM SA1100 CPUs 1608d321b81SPeter Tyser /lib Architecture specific library files 1618d321b81SPeter Tyser /avr32 Files generic to AVR32 architecture 1628d321b81SPeter Tyser /cpu CPU specific files 1638d321b81SPeter Tyser /lib Architecture specific library files 1648d321b81SPeter Tyser /blackfin Files generic to Analog Devices Blackfin architecture 1658d321b81SPeter Tyser /cpu CPU specific files 1668d321b81SPeter Tyser /lib Architecture specific library files 167fea25720SGraeme Russ /x86 Files generic to x86 architecture 1688d321b81SPeter Tyser /cpu CPU specific files 1698d321b81SPeter Tyser /lib Architecture specific library files 1708d321b81SPeter Tyser /m68k Files generic to m68k architecture 1718d321b81SPeter Tyser /cpu CPU specific files 1728d321b81SPeter Tyser /mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs 1738d321b81SPeter Tyser /mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs 1748d321b81SPeter Tyser /mcf532x Files specific to Freescale ColdFire MCF5329 CPUs 1758d321b81SPeter Tyser /mcf5445x Files specific to Freescale ColdFire MCF5445x CPUs 1768d321b81SPeter Tyser /mcf547x_8x Files specific to Freescale ColdFire MCF547x_8x CPUs 1778d321b81SPeter Tyser /lib Architecture specific library files 1788d321b81SPeter Tyser /microblaze Files generic to microblaze architecture 1798d321b81SPeter Tyser /cpu CPU specific files 1808d321b81SPeter Tyser /lib Architecture specific library files 1818d321b81SPeter Tyser /mips Files generic to MIPS architecture 1828d321b81SPeter Tyser /cpu CPU specific files 18392bbd64eSDaniel Schwierzeck /mips32 Files specific to MIPS32 CPUs 18480421fccSXiangfu Liu /xburst Files specific to Ingenic XBurst CPUs 1858d321b81SPeter Tyser /lib Architecture specific library files 186afc1ce82SMacpaul Lin /nds32 Files generic to NDS32 architecture 187afc1ce82SMacpaul Lin /cpu CPU specific files 188afc1ce82SMacpaul Lin /n1213 Files specific to Andes Technology N1213 CPUs 189afc1ce82SMacpaul Lin /lib Architecture specific library files 1908d321b81SPeter Tyser /nios2 Files generic to Altera NIOS2 architecture 1918d321b81SPeter Tyser /cpu CPU specific files 1928d321b81SPeter Tyser /lib Architecture specific library files 193a47a12beSStefan Roese /powerpc Files generic to PowerPC architecture 1948d321b81SPeter Tyser /cpu CPU specific files 1958d321b81SPeter Tyser /74xx_7xx Files specific to Freescale MPC74xx and 7xx CPUs 1968d321b81SPeter Tyser /mpc5xx Files specific to Freescale MPC5xx CPUs 1978d321b81SPeter Tyser /mpc5xxx Files specific to Freescale MPC5xxx CPUs 1988d321b81SPeter Tyser /mpc8xx Files specific to Freescale MPC8xx CPUs 1998d321b81SPeter Tyser /mpc8220 Files specific to Freescale MPC8220 CPUs 2008d321b81SPeter Tyser /mpc824x Files specific to Freescale MPC824x CPUs 2018d321b81SPeter Tyser /mpc8260 Files specific to Freescale MPC8260 CPUs 2028d321b81SPeter Tyser /mpc85xx Files specific to Freescale MPC85xx CPUs 2038d321b81SPeter Tyser /ppc4xx Files specific to AMCC PowerPC 4xx CPUs 2048d321b81SPeter Tyser /lib Architecture specific library files 2058d321b81SPeter Tyser /sh Files generic to SH architecture 2068d321b81SPeter Tyser /cpu CPU specific files 2078d321b81SPeter Tyser /sh2 Files specific to sh2 CPUs 2088d321b81SPeter Tyser /sh3 Files specific to sh3 CPUs 2098d321b81SPeter Tyser /sh4 Files specific to sh4 CPUs 2108d321b81SPeter Tyser /lib Architecture specific library files 2118d321b81SPeter Tyser /sparc Files generic to SPARC architecture 2128d321b81SPeter Tyser /cpu CPU specific files 2138d321b81SPeter Tyser /leon2 Files specific to Gaisler LEON2 SPARC CPU 2148d321b81SPeter Tyser /leon3 Files specific to Gaisler LEON3 SPARC CPU 2158d321b81SPeter Tyser /lib Architecture specific library files 2168d321b81SPeter Tyser/api Machine/arch independent API for external apps 2178d321b81SPeter Tyser/board Board dependent files 2188d321b81SPeter Tyser/common Misc architecture independent functions 2198d321b81SPeter Tyser/disk Code for disk drive partition handling 2208d321b81SPeter Tyser/doc Documentation (don't expect too much) 2218d321b81SPeter Tyser/drivers Commonly used device drivers 2228d321b81SPeter Tyser/examples Example code for standalone applications, etc. 2238d321b81SPeter Tyser/fs Filesystem code (cramfs, ext2, jffs2, etc.) 2248d321b81SPeter Tyser/include Header Files 2258d321b81SPeter Tyser/lib Files generic to all architectures 2268d321b81SPeter Tyser /libfdt Library files to support flattened device trees 2278d321b81SPeter Tyser /lzma Library files to support LZMA decompression 2288d321b81SPeter Tyser /lzo Library files to support LZO decompression 2298d321b81SPeter Tyser/net Networking code 2308d321b81SPeter Tyser/post Power On Self Test 2318d321b81SPeter Tyser/rtc Real Time Clock drivers 2328d321b81SPeter Tyser/tools Tools to build S-Record or U-Boot images, etc. 233c609719bSwdenk 234c609719bSwdenkSoftware Configuration: 235c609719bSwdenk======================= 236c609719bSwdenk 237c609719bSwdenkConfiguration is usually done using C preprocessor defines; the 238c609719bSwdenkrationale behind that is to avoid dead code whenever possible. 239c609719bSwdenk 240c609719bSwdenkThere are two classes of configuration variables: 241c609719bSwdenk 242c609719bSwdenk* Configuration _OPTIONS_: 243c609719bSwdenk These are selectable by the user and have names beginning with 244c609719bSwdenk "CONFIG_". 245c609719bSwdenk 246c609719bSwdenk* Configuration _SETTINGS_: 247c609719bSwdenk These depend on the hardware etc. and should not be meddled with if 248c609719bSwdenk you don't know what you're doing; they have names beginning with 2496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD "CONFIG_SYS_". 250c609719bSwdenk 251c609719bSwdenkLater we will add a configuration tool - probably similar to or even 252c609719bSwdenkidentical to what's used for the Linux kernel. Right now, we have to 253c609719bSwdenkdo the configuration by hand, which means creating some symbolic 254c609719bSwdenklinks and editing some configuration files. We use the TQM8xxL boards 255c609719bSwdenkas an example here. 256c609719bSwdenk 257c609719bSwdenk 258c609719bSwdenkSelection of Processor Architecture and Board Type: 259c609719bSwdenk--------------------------------------------------- 260c609719bSwdenk 261c609719bSwdenkFor all supported boards there are ready-to-use default 262c609719bSwdenkconfigurations available; just type "make <board_name>_config". 263c609719bSwdenk 264c609719bSwdenkExample: For a TQM823L module type: 265c609719bSwdenk 266c609719bSwdenk cd u-boot 267c609719bSwdenk make TQM823L_config 268c609719bSwdenk 26911ccc33fSMarcel ZiswilerFor the Cogent platform, you need to specify the CPU type as well; 270c609719bSwdenke.g. "make cogent_mpc8xx_config". And also configure the cogent 271c609719bSwdenkdirectory according to the instructions in cogent/README. 272c609719bSwdenk 273c609719bSwdenk 274c609719bSwdenkConfiguration Options: 275c609719bSwdenk---------------------- 276c609719bSwdenk 277c609719bSwdenkConfiguration depends on the combination of board and CPU type; all 278c609719bSwdenksuch information is kept in a configuration file 279c609719bSwdenk"include/configs/<board_name>.h". 280c609719bSwdenk 281c609719bSwdenkExample: For a TQM823L module, all configuration settings are in 282c609719bSwdenk"include/configs/TQM823L.h". 283c609719bSwdenk 284c609719bSwdenk 2857f6c2cbcSwdenkMany of the options are named exactly as the corresponding Linux 2867f6c2cbcSwdenkkernel configuration options. The intention is to make it easier to 2877f6c2cbcSwdenkbuild a config tool - later. 2887f6c2cbcSwdenk 2897f6c2cbcSwdenk 290c609719bSwdenkThe following options need to be configured: 291c609719bSwdenk 2922628114eSKim Phillips- CPU Type: Define exactly one, e.g. CONFIG_MPC85XX. 293c609719bSwdenk 2942628114eSKim Phillips- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS. 2956ccec449SWolfgang Denk 2966ccec449SWolfgang Denk- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined) 29709ea0de0SHaavard Skinnemoen Define exactly one, e.g. CONFIG_ATSTK1002 298c609719bSwdenk 299c609719bSwdenk- CPU Module Type: (if CONFIG_COGENT is defined) 300c609719bSwdenk Define exactly one of 301c609719bSwdenk CONFIG_CMA286_60_OLD 302c609719bSwdenk--- FIXME --- not tested yet: 303c609719bSwdenk CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P, 304c609719bSwdenk CONFIG_CMA287_23, CONFIG_CMA287_50 305c609719bSwdenk 306c609719bSwdenk- Motherboard Type: (if CONFIG_COGENT is defined) 307c609719bSwdenk Define exactly one of 308c609719bSwdenk CONFIG_CMA101, CONFIG_CMA102 309c609719bSwdenk 310c609719bSwdenk- Motherboard I/O Modules: (if CONFIG_COGENT is defined) 311c609719bSwdenk Define one or more of 312c609719bSwdenk CONFIG_CMA302 313c609719bSwdenk 314c609719bSwdenk- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined) 315c609719bSwdenk Define one or more of 316c609719bSwdenk CONFIG_LCD_HEARTBEAT - update a character position on 31711ccc33fSMarcel Ziswiler the LCD display every second with 318c609719bSwdenk a "rotator" |\-/|\-/ 319c609719bSwdenk 3202535d602Swdenk- Board flavour: (if CONFIG_MPC8260ADS is defined) 3212535d602Swdenk CONFIG_ADSTYPE 3222535d602Swdenk Possible values are: 3236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8260ADS - original MPC8260ADS 3246d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8266ADS - MPC8266ADS 3256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PQ2FADS - PQ2FADS-ZU or PQ2FADS-VR 3266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8272ADS - MPC8272ADS 3272535d602Swdenk 328cf946c6dSLei Wen- Marvell Family Member 329cf946c6dSLei Wen CONFIG_SYS_MVFS - define it if you want to enable 330cf946c6dSLei Wen multiple fs option at one time 331cf946c6dSLei Wen for marvell soc family 332cf946c6dSLei Wen 333c609719bSwdenk- MPC824X Family Member (if CONFIG_MPC824X is defined) 334c609719bSwdenk Define exactly one of 335c609719bSwdenk CONFIG_MPC8240, CONFIG_MPC8245 336c609719bSwdenk 33711ccc33fSMarcel Ziswiler- 8xx CPU Options: (if using an MPC8xx CPU) 33866ca92a5Swdenk CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if 33966ca92a5Swdenk get_gclk_freq() cannot work 3405da627a4Swdenk e.g. if there is no 32KHz 3415da627a4Swdenk reference PIT/RTC clock 34266ca92a5Swdenk CONFIG_8xx_OSCLK - PLL input clock (either EXTCLK 34366ca92a5Swdenk or XTAL/EXTAL) 344c609719bSwdenk 34566ca92a5Swdenk- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU): 3466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8xx_CPUCLK_MIN 3476d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_8xx_CPUCLK_MAX 34866ca92a5Swdenk CONFIG_8xx_CPUCLK_DEFAULT 34975d1ea7fSwdenk See doc/README.MPC866 35075d1ea7fSwdenk 3516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MEASURE_CPUCLK 35275d1ea7fSwdenk 35375d1ea7fSwdenk Define this to measure the actual CPU clock instead 35475d1ea7fSwdenk of relying on the correctness of the configured 35575d1ea7fSwdenk values. Mostly useful for board bringup to make sure 35675d1ea7fSwdenk the PLL is locked at the intended frequency. Note 35775d1ea7fSwdenk that this requires a (stable) reference clock (32 kHz 3586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD RTC clock or CONFIG_SYS_8XX_XIN) 35975d1ea7fSwdenk 360506f3918SHeiko Schocher CONFIG_SYS_DELAYED_ICACHE 361506f3918SHeiko Schocher 362506f3918SHeiko Schocher Define this option if you want to enable the 363506f3918SHeiko Schocher ICache only when Code runs from RAM. 364506f3918SHeiko Schocher 36566412c63SKumar Gala- 85xx CPU Options: 36666412c63SKumar Gala CONFIG_SYS_FSL_TBCLK_DIV 36766412c63SKumar Gala 36866412c63SKumar Gala Defines the core time base clock divider ratio compared to the 36966412c63SKumar Gala system clock. On most PQ3 devices this is 8, on newer QorIQ 37066412c63SKumar Gala devices it can be 16 or 32. The ratio varies from SoC to Soc. 37166412c63SKumar Gala 3728f29084aSKumar Gala CONFIG_SYS_FSL_PCIE_COMPAT 3738f29084aSKumar Gala 3748f29084aSKumar Gala Defines the string to utilize when trying to match PCIe device 3758f29084aSKumar Gala tree nodes for the given platform. 3768f29084aSKumar Gala 3770b953ffcSMarkus Klotzbuecher- Intel Monahans options: 3786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MONAHANS_RUN_MODE_OSC_RATIO 3790b953ffcSMarkus Klotzbuecher 3800b953ffcSMarkus Klotzbuecher Defines the Monahans run mode to oscillator 3810b953ffcSMarkus Klotzbuecher ratio. Valid values are 8, 16, 24, 31. The core 3820b953ffcSMarkus Klotzbuecher frequency is this value multiplied by 13 MHz. 3830b953ffcSMarkus Klotzbuecher 3846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MONAHANS_TURBO_RUN_MODE_RATIO 3850b953ffcSMarkus Klotzbuecher 3860b953ffcSMarkus Klotzbuecher Defines the Monahans turbo mode to oscillator 3870b953ffcSMarkus Klotzbuecher ratio. Valid values are 1 (default if undefined) and 3880b953ffcSMarkus Klotzbuecher 2. The core frequency as calculated above is multiplied 3890b953ffcSMarkus Klotzbuecher by this value. 3900b953ffcSMarkus Klotzbuecher 39192bbd64eSDaniel Schwierzeck- MIPS CPU options: 39292bbd64eSDaniel Schwierzeck CONFIG_SYS_INIT_SP_OFFSET 39392bbd64eSDaniel Schwierzeck 39492bbd64eSDaniel Schwierzeck Offset relative to CONFIG_SYS_SDRAM_BASE for initial stack 39592bbd64eSDaniel Schwierzeck pointer. This is needed for the temporary stack before 39692bbd64eSDaniel Schwierzeck relocation. 39792bbd64eSDaniel Schwierzeck 39892bbd64eSDaniel Schwierzeck CONFIG_SYS_MIPS_CACHE_MODE 39992bbd64eSDaniel Schwierzeck 40092bbd64eSDaniel Schwierzeck Cache operation mode for the MIPS CPU. 40192bbd64eSDaniel Schwierzeck See also arch/mips/include/asm/mipsregs.h. 40292bbd64eSDaniel Schwierzeck Possible values are: 40392bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_NO_WA 40492bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_WA 40592bbd64eSDaniel Schwierzeck CONF_CM_UNCACHED 40692bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_NONCOHERENT 40792bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_CE 40892bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_COW 40992bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_CUW 41092bbd64eSDaniel Schwierzeck CONF_CM_CACHABLE_ACCELERATED 41192bbd64eSDaniel Schwierzeck 41292bbd64eSDaniel Schwierzeck CONFIG_SYS_XWAY_EBU_BOOTCFG 41392bbd64eSDaniel Schwierzeck 41492bbd64eSDaniel Schwierzeck Special option for Lantiq XWAY SoCs for booting from NOR flash. 41592bbd64eSDaniel Schwierzeck See also arch/mips/cpu/mips32/start.S. 41692bbd64eSDaniel Schwierzeck 41792bbd64eSDaniel Schwierzeck CONFIG_XWAY_SWAP_BYTES 41892bbd64eSDaniel Schwierzeck 41992bbd64eSDaniel Schwierzeck Enable compilation of tools/xway-swap-bytes needed for Lantiq 42092bbd64eSDaniel Schwierzeck XWAY SoCs for booting from NOR flash. The U-Boot image needs to 42192bbd64eSDaniel Schwierzeck be swapped if a flash programmer is used. 42292bbd64eSDaniel Schwierzeck 4235da627a4Swdenk- Linux Kernel Interface: 424c609719bSwdenk CONFIG_CLOCKS_IN_MHZ 425c609719bSwdenk 426c609719bSwdenk U-Boot stores all clock information in Hz 427c609719bSwdenk internally. For binary compatibility with older Linux 428c609719bSwdenk kernels (which expect the clocks passed in the 429c609719bSwdenk bd_info data to be in MHz) the environment variable 430c609719bSwdenk "clocks_in_mhz" can be defined so that U-Boot 431c609719bSwdenk converts clock data to MHZ before passing it to the 432c609719bSwdenk Linux kernel. 433c609719bSwdenk When CONFIG_CLOCKS_IN_MHZ is defined, a definition of 434c609719bSwdenk "clocks_in_mhz=1" is automatically included in the 435c609719bSwdenk default environment. 436c609719bSwdenk 4375da627a4Swdenk CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only] 4385da627a4Swdenk 43911ccc33fSMarcel Ziswiler When transferring memsize parameter to linux, some versions 4405da627a4Swdenk expect it to be in bytes, others in MB. 4415da627a4Swdenk Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes. 4425da627a4Swdenk 443fec6d9eeSGerald Van Baren CONFIG_OF_LIBFDT 444f57f70aaSWolfgang Denk 445f57f70aaSWolfgang Denk New kernel versions are expecting firmware settings to be 446213bf8c8SGerald Van Baren passed using flattened device trees (based on open firmware 447213bf8c8SGerald Van Baren concepts). 448213bf8c8SGerald Van Baren 449213bf8c8SGerald Van Baren CONFIG_OF_LIBFDT 450213bf8c8SGerald Van Baren * New libfdt-based support 451213bf8c8SGerald Van Baren * Adds the "fdt" command 4523bb342fcSKim Phillips * The bootm command automatically updates the fdt 453213bf8c8SGerald Van Baren 454b55ae402SMarcel Ziswiler OF_CPU - The proper name of the cpus node (only required for 455b55ae402SMarcel Ziswiler MPC512X and MPC5xxx based boards). 456b55ae402SMarcel Ziswiler OF_SOC - The proper name of the soc node (only required for 457b55ae402SMarcel Ziswiler MPC512X and MPC5xxx based boards). 458f57f70aaSWolfgang Denk OF_TBCLK - The timebase frequency. 459c2871f03SKumar Gala OF_STDOUT_PATH - The path to the console device 460f57f70aaSWolfgang Denk 46111ccc33fSMarcel Ziswiler boards with QUICC Engines require OF_QE to set UCC MAC 46211ccc33fSMarcel Ziswiler addresses 4633bb342fcSKim Phillips 4644e253137SKumar Gala CONFIG_OF_BOARD_SETUP 4654e253137SKumar Gala 4664e253137SKumar Gala Board code has addition modification that it wants to make 4674e253137SKumar Gala to the flat device tree before handing it off to the kernel 4686705d81eSwdenk 4690267768eSMatthew McClintock CONFIG_OF_BOOT_CPU 4700267768eSMatthew McClintock 47111ccc33fSMarcel Ziswiler This define fills in the correct boot CPU in the boot 4720267768eSMatthew McClintock param header, the default value is zero if undefined. 4730267768eSMatthew McClintock 4743887c3fbSHeiko Schocher CONFIG_OF_IDE_FIXUP 4753887c3fbSHeiko Schocher 4763887c3fbSHeiko Schocher U-Boot can detect if an IDE device is present or not. 4773887c3fbSHeiko Schocher If not, and this new config option is activated, U-Boot 4783887c3fbSHeiko Schocher removes the ATA node from the DTS before booting Linux, 4793887c3fbSHeiko Schocher so the Linux IDE driver does not probe the device and 4803887c3fbSHeiko Schocher crash. This is needed for buggy hardware (uc101) where 4813887c3fbSHeiko Schocher no pull down resistor is connected to the signal IDE5V_DD7. 4823887c3fbSHeiko Schocher 4837eb29398SIgor Grinberg CONFIG_MACH_TYPE [relevant for ARM only][mandatory] 4847eb29398SIgor Grinberg 4857eb29398SIgor Grinberg This setting is mandatory for all boards that have only one 4867eb29398SIgor Grinberg machine type and must be used to specify the machine type 4877eb29398SIgor Grinberg number as it appears in the ARM machine registry 4887eb29398SIgor Grinberg (see http://www.arm.linux.org.uk/developer/machines/). 4897eb29398SIgor Grinberg Only boards that have multiple machine types supported 4907eb29398SIgor Grinberg in a single configuration file and the machine type is 4917eb29398SIgor Grinberg runtime discoverable, do not have to use this setting. 4927eb29398SIgor Grinberg 4930b2f4ecaSNiklaus Giger- vxWorks boot parameters: 4940b2f4ecaSNiklaus Giger 4950b2f4ecaSNiklaus Giger bootvx constructs a valid bootline using the following 4960b2f4ecaSNiklaus Giger environments variables: bootfile, ipaddr, serverip, hostname. 4970b2f4ecaSNiklaus Giger It loads the vxWorks image pointed bootfile. 4980b2f4ecaSNiklaus Giger 4990b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_BOOT_DEVICE - The vxworks device name 5000b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_MAC_PTR - Ethernet 6 byte MA -address 5010b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_SERVERNAME - Name of the server 5020b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_BOOT_ADDR - Address of boot parameters 5030b2f4ecaSNiklaus Giger 5040b2f4ecaSNiklaus Giger CONFIG_SYS_VXWORKS_ADD_PARAMS 5050b2f4ecaSNiklaus Giger 5060b2f4ecaSNiklaus Giger Add it at the end of the bootline. E.g "u=username pw=secret" 5070b2f4ecaSNiklaus Giger 5080b2f4ecaSNiklaus Giger Note: If a "bootargs" environment is defined, it will overwride 5090b2f4ecaSNiklaus Giger the defaults discussed just above. 5100b2f4ecaSNiklaus Giger 5112c451f78SAneesh V- Cache Configuration: 5122c451f78SAneesh V CONFIG_SYS_ICACHE_OFF - Do not enable instruction cache in U-Boot 5132c451f78SAneesh V CONFIG_SYS_DCACHE_OFF - Do not enable data cache in U-Boot 5142c451f78SAneesh V CONFIG_SYS_L2CACHE_OFF- Do not enable L2 cache in U-Boot 5152c451f78SAneesh V 51693bc2193SAneesh V- Cache Configuration for ARM: 51793bc2193SAneesh V CONFIG_SYS_L2_PL310 - Enable support for ARM PL310 L2 cache 51893bc2193SAneesh V controller 51993bc2193SAneesh V CONFIG_SYS_PL310_BASE - Physical base address of PL310 52093bc2193SAneesh V controller register space 52193bc2193SAneesh V 5226705d81eSwdenk- Serial Ports: 52348d0192fSAndreas Engel CONFIG_PL010_SERIAL 5246705d81eSwdenk 5256705d81eSwdenk Define this if you want support for Amba PrimeCell PL010 UARTs. 5266705d81eSwdenk 52748d0192fSAndreas Engel CONFIG_PL011_SERIAL 5286705d81eSwdenk 5296705d81eSwdenk Define this if you want support for Amba PrimeCell PL011 UARTs. 5306705d81eSwdenk 5316705d81eSwdenk CONFIG_PL011_CLOCK 5326705d81eSwdenk 5336705d81eSwdenk If you have Amba PrimeCell PL011 UARTs, set this variable to 5346705d81eSwdenk the clock speed of the UARTs. 5356705d81eSwdenk 5366705d81eSwdenk CONFIG_PL01x_PORTS 5376705d81eSwdenk 5386705d81eSwdenk If you have Amba PrimeCell PL010 or PL011 UARTs on your board, 5396705d81eSwdenk define this to a list of base addresses for each (supported) 5406705d81eSwdenk port. See e.g. include/configs/versatile.h 5416705d81eSwdenk 542910f1ae3SJohn Rigby CONFIG_PL011_SERIAL_RLCR 543910f1ae3SJohn Rigby 544910f1ae3SJohn Rigby Some vendor versions of PL011 serial ports (e.g. ST-Ericsson U8500) 545910f1ae3SJohn Rigby have separate receive and transmit line control registers. Set 546910f1ae3SJohn Rigby this variable to initialize the extra register. 547910f1ae3SJohn Rigby 548910f1ae3SJohn Rigby CONFIG_PL011_SERIAL_FLUSH_ON_INIT 549910f1ae3SJohn Rigby 550910f1ae3SJohn Rigby On some platforms (e.g. U8500) U-Boot is loaded by a second stage 551910f1ae3SJohn Rigby boot loader that has already initialized the UART. Define this 552910f1ae3SJohn Rigby variable to flush the UART at init time. 553910f1ae3SJohn Rigby 5546705d81eSwdenk 555c609719bSwdenk- Console Interface: 556c609719bSwdenk Depending on board, define exactly one serial port 557c609719bSwdenk (like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2, 558c609719bSwdenk CONFIG_8xx_CONS_SCC1, ...), or switch off the serial 559c609719bSwdenk console by defining CONFIG_8xx_CONS_NONE 560c609719bSwdenk 561c609719bSwdenk Note: if CONFIG_8xx_CONS_NONE is defined, the serial 562c609719bSwdenk port routines must be defined elsewhere 563c609719bSwdenk (i.e. serial_init(), serial_getc(), ...) 564c609719bSwdenk 565c609719bSwdenk CONFIG_CFB_CONSOLE 566c609719bSwdenk Enables console device for a color framebuffer. Needs following 567c609719bSwdenk defines (cf. smiLynxEM, i8042, board/eltec/bab7xx) 568c609719bSwdenk VIDEO_FB_LITTLE_ENDIAN graphic memory organisation 569c609719bSwdenk (default big endian) 570c609719bSwdenk VIDEO_HW_RECTFILL graphic chip supports 571c609719bSwdenk rectangle fill 572c609719bSwdenk (cf. smiLynxEM) 573c609719bSwdenk VIDEO_HW_BITBLT graphic chip supports 574c609719bSwdenk bit-blit (cf. smiLynxEM) 575c609719bSwdenk VIDEO_VISIBLE_COLS visible pixel columns 576c609719bSwdenk (cols=pitch) 577c609719bSwdenk VIDEO_VISIBLE_ROWS visible pixel rows 578c609719bSwdenk VIDEO_PIXEL_SIZE bytes per pixel 579c609719bSwdenk VIDEO_DATA_FORMAT graphic data format 580c609719bSwdenk (0-5, cf. cfb_console.c) 581c609719bSwdenk VIDEO_FB_ADRS framebuffer address 582c609719bSwdenk VIDEO_KBD_INIT_FCT keyboard int fct 583c609719bSwdenk (i.e. i8042_kbd_init()) 584c609719bSwdenk VIDEO_TSTC_FCT test char fct 585c609719bSwdenk (i.e. i8042_tstc) 586c609719bSwdenk VIDEO_GETC_FCT get char fct 587c609719bSwdenk (i.e. i8042_getc) 588c609719bSwdenk CONFIG_CONSOLE_CURSOR cursor drawing on/off 589c609719bSwdenk (requires blink timer 590c609719bSwdenk cf. i8042.c) 5916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_CONSOLE_BLINK_COUNT blink interval (cf. i8042.c) 592c609719bSwdenk CONFIG_CONSOLE_TIME display time/date info in 593c609719bSwdenk upper right corner 594602ad3b3SJon Loeliger (requires CONFIG_CMD_DATE) 595c609719bSwdenk CONFIG_VIDEO_LOGO display Linux logo in 596c609719bSwdenk upper left corner 597a6c7ad2fSwdenk CONFIG_VIDEO_BMP_LOGO use bmp_logo.h instead of 598a6c7ad2fSwdenk linux_logo.h for logo. 599a6c7ad2fSwdenk Requires CONFIG_VIDEO_LOGO 600c609719bSwdenk CONFIG_CONSOLE_EXTRA_INFO 60111ccc33fSMarcel Ziswiler additional board info beside 602c609719bSwdenk the logo 603c609719bSwdenk 604c609719bSwdenk When CONFIG_CFB_CONSOLE is defined, video console is 605c609719bSwdenk default i/o. Serial console can be forced with 606c609719bSwdenk environment 'console=serial'. 607c609719bSwdenk 608a3ad8e26Swdenk When CONFIG_SILENT_CONSOLE is defined, all console 609a3ad8e26Swdenk messages (by U-Boot and Linux!) can be silenced with 610a3ad8e26Swdenk the "silent" environment variable. See 611a3ad8e26Swdenk doc/README.silent for more information. 612a3ad8e26Swdenk 613c609719bSwdenk- Console Baudrate: 614c609719bSwdenk CONFIG_BAUDRATE - in bps 615c609719bSwdenk Select one of the baudrates listed in 6166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BAUDRATE_TABLE, see below. 6176d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale 618c609719bSwdenk 619c92fac91SHeiko Schocher- Console Rx buffer length 620c92fac91SHeiko Schocher With CONFIG_SYS_SMC_RXBUFLEN it is possible to define 621c92fac91SHeiko Schocher the maximum receive buffer length for the SMC. 6222b3f12c2SHeiko Schocher This option is actual only for 82xx and 8xx possible. 623c92fac91SHeiko Schocher If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE 624c92fac91SHeiko Schocher must be defined, to setup the maximum idle timeout for 625c92fac91SHeiko Schocher the SMC. 626c92fac91SHeiko Schocher 6279558b48aSGraeme Russ- Pre-Console Buffer: 6289558b48aSGraeme Russ Prior to the console being initialised (i.e. serial UART 6299558b48aSGraeme Russ initialised etc) all console output is silently discarded. 6309558b48aSGraeme Russ Defining CONFIG_PRE_CONSOLE_BUFFER will cause U-Boot to 6319558b48aSGraeme Russ buffer any console messages prior to the console being 6329558b48aSGraeme Russ initialised to a buffer of size CONFIG_PRE_CON_BUF_SZ 6339558b48aSGraeme Russ bytes located at CONFIG_PRE_CON_BUF_ADDR. The buffer is 6349558b48aSGraeme Russ a circular buffer, so if more than CONFIG_PRE_CON_BUF_SZ 6359558b48aSGraeme Russ bytes are output before the console is initialised, the 6369558b48aSGraeme Russ earlier bytes are discarded. 6379558b48aSGraeme Russ 6389558b48aSGraeme Russ 'Sane' compilers will generate smaller code if 6399558b48aSGraeme Russ CONFIG_PRE_CON_BUF_SZ is a power of 2 6409558b48aSGraeme Russ 641c609719bSwdenk- Boot Delay: CONFIG_BOOTDELAY - in seconds 642c609719bSwdenk Delay before automatically booting the default image; 643c609719bSwdenk set to -1 to disable autoboot. 644c609719bSwdenk 645c609719bSwdenk See doc/README.autoboot for these options that 646c609719bSwdenk work with CONFIG_BOOTDELAY. None are required. 647c609719bSwdenk CONFIG_BOOT_RETRY_TIME 648c609719bSwdenk CONFIG_BOOT_RETRY_MIN 649c609719bSwdenk CONFIG_AUTOBOOT_KEYED 650c609719bSwdenk CONFIG_AUTOBOOT_PROMPT 651c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR 652c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR 653c609719bSwdenk CONFIG_AUTOBOOT_DELAY_STR2 654c609719bSwdenk CONFIG_AUTOBOOT_STOP_STR2 655c609719bSwdenk CONFIG_ZERO_BOOTDELAY_CHECK 656c609719bSwdenk CONFIG_RESET_TO_RETRY 657c609719bSwdenk 658c609719bSwdenk- Autoboot Command: 659c609719bSwdenk CONFIG_BOOTCOMMAND 660c609719bSwdenk Only needed when CONFIG_BOOTDELAY is enabled; 661c609719bSwdenk define a command string that is automatically executed 662c609719bSwdenk when no character is read on the console interface 663c609719bSwdenk within "Boot Delay" after reset. 664c609719bSwdenk 665c609719bSwdenk CONFIG_BOOTARGS 666c609719bSwdenk This can be used to pass arguments to the bootm 667c609719bSwdenk command. The value of CONFIG_BOOTARGS goes into the 668c609719bSwdenk environment value "bootargs". 669c609719bSwdenk 670c609719bSwdenk CONFIG_RAMBOOT and CONFIG_NFSBOOT 671c609719bSwdenk The value of these goes into the environment as 672c609719bSwdenk "ramboot" and "nfsboot" respectively, and can be used 673c609719bSwdenk as a convenience, when switching between booting from 67411ccc33fSMarcel Ziswiler RAM and NFS. 675c609719bSwdenk 676c609719bSwdenk- Pre-Boot Commands: 677c609719bSwdenk CONFIG_PREBOOT 678c609719bSwdenk 679c609719bSwdenk When this option is #defined, the existence of the 680c609719bSwdenk environment variable "preboot" will be checked 681c609719bSwdenk immediately before starting the CONFIG_BOOTDELAY 682c609719bSwdenk countdown and/or running the auto-boot command resp. 683c609719bSwdenk entering interactive mode. 684c609719bSwdenk 685c609719bSwdenk This feature is especially useful when "preboot" is 686c609719bSwdenk automatically generated or modified. For an example 687c609719bSwdenk see the LWMON board specific code: here "preboot" is 688c609719bSwdenk modified when the user holds down a certain 689c609719bSwdenk combination of keys on the (special) keyboard when 690c609719bSwdenk booting the systems 691c609719bSwdenk 692c609719bSwdenk- Serial Download Echo Mode: 693c609719bSwdenk CONFIG_LOADS_ECHO 694c609719bSwdenk If defined to 1, all characters received during a 695c609719bSwdenk serial download (using the "loads" command) are 696c609719bSwdenk echoed back. This might be needed by some terminal 697c609719bSwdenk emulations (like "cu"), but may as well just take 698c609719bSwdenk time on others. This setting #define's the initial 699c609719bSwdenk value of the "loads_echo" environment variable. 700c609719bSwdenk 701602ad3b3SJon Loeliger- Kgdb Serial Baudrate: (if CONFIG_CMD_KGDB is defined) 702c609719bSwdenk CONFIG_KGDB_BAUDRATE 703c609719bSwdenk Select one of the baudrates listed in 7046d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BAUDRATE_TABLE, see below. 705c609719bSwdenk 706c609719bSwdenk- Monitor Functions: 707602ad3b3SJon Loeliger Monitor commands can be included or excluded 708602ad3b3SJon Loeliger from the build by using the #include files 709602ad3b3SJon Loeliger "config_cmd_all.h" and #undef'ing unwanted 710602ad3b3SJon Loeliger commands, or using "config_cmd_default.h" 711602ad3b3SJon Loeliger and augmenting with additional #define's 712602ad3b3SJon Loeliger for wanted commands. 713c609719bSwdenk 714602ad3b3SJon Loeliger The default command configuration includes all commands 715602ad3b3SJon Loeliger except those marked below with a "*". 716602ad3b3SJon Loeliger 717602ad3b3SJon Loeliger CONFIG_CMD_ASKENV * ask for env variable 718602ad3b3SJon Loeliger CONFIG_CMD_BDI bdinfo 719602ad3b3SJon Loeliger CONFIG_CMD_BEDBUG * Include BedBug Debugger 720602ad3b3SJon Loeliger CONFIG_CMD_BMP * BMP support 721602ad3b3SJon Loeliger CONFIG_CMD_BSP * Board specific commands 722602ad3b3SJon Loeliger CONFIG_CMD_BOOTD bootd 723602ad3b3SJon Loeliger CONFIG_CMD_CACHE * icache, dcache 724602ad3b3SJon Loeliger CONFIG_CMD_CONSOLE coninfo 725710b9938SMike Frysinger CONFIG_CMD_CRC32 * crc32 726602ad3b3SJon Loeliger CONFIG_CMD_DATE * support for RTC, date/time... 727602ad3b3SJon Loeliger CONFIG_CMD_DHCP * DHCP support 728602ad3b3SJon Loeliger CONFIG_CMD_DIAG * Diagnostics 729a7c93104SPeter Tyser CONFIG_CMD_DS4510 * ds4510 I2C gpio commands 730a7c93104SPeter Tyser CONFIG_CMD_DS4510_INFO * ds4510 I2C info command 731a7c93104SPeter Tyser CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd 732a7c93104SPeter Tyser CONFIG_CMD_DS4510_RST * ds4510 I2C rst command 733602ad3b3SJon Loeliger CONFIG_CMD_DTT * Digital Therm and Thermostat 734602ad3b3SJon Loeliger CONFIG_CMD_ECHO echo arguments 735246c6922SPeter Tyser CONFIG_CMD_EDITENV edit env variable 736602ad3b3SJon Loeliger CONFIG_CMD_EEPROM * EEPROM read/write support 737602ad3b3SJon Loeliger CONFIG_CMD_ELF * bootelf, bootvx 7380c79cda0SMike Frysinger CONFIG_CMD_EXPORTENV * export the environment 739bdab39d3SMike Frysinger CONFIG_CMD_SAVEENV saveenv 740602ad3b3SJon Loeliger CONFIG_CMD_FDC * Floppy Disk Support 741602ad3b3SJon Loeliger CONFIG_CMD_FAT * FAT partition support 742602ad3b3SJon Loeliger CONFIG_CMD_FDOS * Dos diskette Support 743602ad3b3SJon Loeliger CONFIG_CMD_FLASH flinfo, erase, protect 744602ad3b3SJon Loeliger CONFIG_CMD_FPGA FPGA device initialization support 745a641b979SMike Frysinger CONFIG_CMD_GO * the 'go' command (exec code) 746a000b795SKim Phillips CONFIG_CMD_GREPENV * search environment 747602ad3b3SJon Loeliger CONFIG_CMD_HWFLOW * RTS/CTS hw flow control 748602ad3b3SJon Loeliger CONFIG_CMD_I2C * I2C serial bus support 749602ad3b3SJon Loeliger CONFIG_CMD_IDE * IDE harddisk support 750602ad3b3SJon Loeliger CONFIG_CMD_IMI iminfo 751602ad3b3SJon Loeliger CONFIG_CMD_IMLS List all found images 752602ad3b3SJon Loeliger CONFIG_CMD_IMMAP * IMMR dump support 7530c79cda0SMike Frysinger CONFIG_CMD_IMPORTENV * import an environment 754602ad3b3SJon Loeliger CONFIG_CMD_IRQ * irqinfo 755602ad3b3SJon Loeliger CONFIG_CMD_ITEST Integer/string test of 2 values 756602ad3b3SJon Loeliger CONFIG_CMD_JFFS2 * JFFS2 Support 757602ad3b3SJon Loeliger CONFIG_CMD_KGDB * kgdb 7581ba7fd25SMike Frysinger CONFIG_CMD_LDRINFO ldrinfo (display Blackfin loader) 759602ad3b3SJon Loeliger CONFIG_CMD_LOADB loadb 760602ad3b3SJon Loeliger CONFIG_CMD_LOADS loads 76102c9aa1dSRobin Getz CONFIG_CMD_MD5SUM print md5 message digest 76202c9aa1dSRobin Getz (requires CONFIG_CMD_MEMORY and CONFIG_MD5) 763602ad3b3SJon Loeliger CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base, 76456523f12Swdenk loop, loopw, mtest 765602ad3b3SJon Loeliger CONFIG_CMD_MISC Misc functions like sleep etc 766602ad3b3SJon Loeliger CONFIG_CMD_MMC * MMC memory mapped support 767602ad3b3SJon Loeliger CONFIG_CMD_MII * MII utility commands 76868d7d651SStefan Roese CONFIG_CMD_MTDPARTS * MTD partition support 769602ad3b3SJon Loeliger CONFIG_CMD_NAND * NAND support 770602ad3b3SJon Loeliger CONFIG_CMD_NET bootp, tftpboot, rarpboot 771e92739d3SPeter Tyser CONFIG_CMD_PCA953X * PCA953x I2C gpio commands 772e92739d3SPeter Tyser CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command 773602ad3b3SJon Loeliger CONFIG_CMD_PCI * pciinfo 774602ad3b3SJon Loeliger CONFIG_CMD_PCMCIA * PCMCIA support 775602ad3b3SJon Loeliger CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network 776602ad3b3SJon Loeliger host 777602ad3b3SJon Loeliger CONFIG_CMD_PORTIO * Port I/O 778602ad3b3SJon Loeliger CONFIG_CMD_REGINFO * Register dump 779602ad3b3SJon Loeliger CONFIG_CMD_RUN run command in env variable 780602ad3b3SJon Loeliger CONFIG_CMD_SAVES * save S record dump 781602ad3b3SJon Loeliger CONFIG_CMD_SCSI * SCSI Support 782602ad3b3SJon Loeliger CONFIG_CMD_SDRAM * print SDRAM configuration information 783602ad3b3SJon Loeliger (requires CONFIG_CMD_I2C) 784602ad3b3SJon Loeliger CONFIG_CMD_SETGETDCR Support for DCR Register access 785602ad3b3SJon Loeliger (4xx only) 786c6b1ee66SAlexander Holler CONFIG_CMD_SHA1SUM print sha1 memory digest 78702c9aa1dSRobin Getz (requires CONFIG_CMD_MEMORY) 78874de7aefSWolfgang Denk CONFIG_CMD_SOURCE "source" command Support 789602ad3b3SJon Loeliger CONFIG_CMD_SPI * SPI serial bus support 7907a83af07SLuca Ceresoli CONFIG_CMD_TFTPSRV * TFTP transfer in server mode 791*1fb7cd49SSimon Glass CONFIG_CMD_TFTPPUT * TFTP put command (upload) 792ca366d0eSChe-liang Chiou CONFIG_CMD_TIME * run command and report execution time 793602ad3b3SJon Loeliger CONFIG_CMD_USB * USB support 794602ad3b3SJon Loeliger CONFIG_CMD_CDP * Cisco Discover Protocol support 795602ad3b3SJon Loeliger CONFIG_CMD_FSL * Microblaze FSL support 796c609719bSwdenk 797c609719bSwdenk 798c609719bSwdenk EXAMPLE: If you want all functions except of network 799c609719bSwdenk support you can write: 800c609719bSwdenk 801602ad3b3SJon Loeliger #include "config_cmd_all.h" 802602ad3b3SJon Loeliger #undef CONFIG_CMD_NET 803c609719bSwdenk 804213bf8c8SGerald Van Baren Other Commands: 805213bf8c8SGerald Van Baren fdt (flattened device tree) command: CONFIG_OF_LIBFDT 806c609719bSwdenk 807c609719bSwdenk Note: Don't enable the "icache" and "dcache" commands 808602ad3b3SJon Loeliger (configuration option CONFIG_CMD_CACHE) unless you know 809c609719bSwdenk what you (and your U-Boot users) are doing. Data 810c609719bSwdenk cache cannot be enabled on systems like the 8xx or 811c609719bSwdenk 8260 (where accesses to the IMMR region must be 812c609719bSwdenk uncached), and it cannot be disabled on all other 813c609719bSwdenk systems where we (mis-) use the data cache to hold an 814c609719bSwdenk initial stack and some data. 815c609719bSwdenk 816c609719bSwdenk 817c609719bSwdenk XXX - this list needs to get updated! 818c609719bSwdenk 819c609719bSwdenk- Watchdog: 820c609719bSwdenk CONFIG_WATCHDOG 821c609719bSwdenk If this variable is defined, it enables watchdog 8226abe6fb6SDetlev Zundel support for the SoC. There must be support in the SoC 8236abe6fb6SDetlev Zundel specific code for a watchdog. For the 8xx and 8260 8246abe6fb6SDetlev Zundel CPUs, the SIU Watchdog feature is enabled in the SYPCR 8256abe6fb6SDetlev Zundel register. When supported for a specific SoC is 8266abe6fb6SDetlev Zundel available, then no further board specific code should 8276abe6fb6SDetlev Zundel be needed to use it. 8286abe6fb6SDetlev Zundel 8296abe6fb6SDetlev Zundel CONFIG_HW_WATCHDOG 8306abe6fb6SDetlev Zundel When using a watchdog circuitry external to the used 8316abe6fb6SDetlev Zundel SoC, then define this variable and provide board 8326abe6fb6SDetlev Zundel specific code for the "hw_watchdog_reset" function. 833c609719bSwdenk 834c1551ea8Sstroese- U-Boot Version: 835c1551ea8Sstroese CONFIG_VERSION_VARIABLE 836c1551ea8Sstroese If this variable is defined, an environment variable 837c1551ea8Sstroese named "ver" is created by U-Boot showing the U-Boot 838c1551ea8Sstroese version as printed by the "version" command. 839c1551ea8Sstroese This variable is readonly. 840c1551ea8Sstroese 841c609719bSwdenk- Real-Time Clock: 842c609719bSwdenk 843602ad3b3SJon Loeliger When CONFIG_CMD_DATE is selected, the type of the RTC 844c609719bSwdenk has to be selected, too. Define exactly one of the 845c609719bSwdenk following options: 846c609719bSwdenk 847c609719bSwdenk CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx 848c609719bSwdenk CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC 8497ce63709SGuennadi Liakhovetski CONFIG_RTC_MC13783 - use MC13783 RTC 850c609719bSwdenk CONFIG_RTC_MC146818 - use MC146818 RTC 8511cb8e980Swdenk CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC 852c609719bSwdenk CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC 8537f70e853Swdenk CONFIG_RTC_DS1338 - use Maxim, Inc. DS1338 RTC 8543bac3513Swdenk CONFIG_RTC_DS164x - use Dallas DS164x RTC 8559536dfccSTor Krill CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC 8564c0d4c3bSwdenk CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC 8576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337 85871d19f30SHeiko Schocher CONFIG_SYS_RV3029_TCR - enable trickle charger on 85971d19f30SHeiko Schocher RV3029 RTC. 860c609719bSwdenk 861b37c7e5eSwdenk Note that if the RTC uses I2C, then the I2C interface 862b37c7e5eSwdenk must also be configured. See I2C Support, below. 863b37c7e5eSwdenk 864e92739d3SPeter Tyser- GPIO Support: 865e92739d3SPeter Tyser CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO 866e92739d3SPeter Tyser CONFIG_PCA953X_INFO - enable pca953x info command 867e92739d3SPeter Tyser 8685dec49caSChris Packham The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of 8695dec49caSChris Packham chip-ngpio pairs that tell the PCA953X driver the number of 8705dec49caSChris Packham pins supported by a particular chip. 8715dec49caSChris Packham 872e92739d3SPeter Tyser Note that if the GPIO device uses I2C, then the I2C interface 873e92739d3SPeter Tyser must also be configured. See I2C Support, below. 874e92739d3SPeter Tyser 875c609719bSwdenk- Timestamp Support: 876c609719bSwdenk 877c609719bSwdenk When CONFIG_TIMESTAMP is selected, the timestamp 878c609719bSwdenk (date and time) of an image is printed by image 879c609719bSwdenk commands like bootm or iminfo. This option is 880602ad3b3SJon Loeliger automatically enabled when you select CONFIG_CMD_DATE . 881c609719bSwdenk 882c609719bSwdenk- Partition Support: 883c609719bSwdenk CONFIG_MAC_PARTITION and/or CONFIG_DOS_PARTITION 88407f3d789Srichardretanubun and/or CONFIG_ISO_PARTITION and/or CONFIG_EFI_PARTITION 885c609719bSwdenk 886602ad3b3SJon Loeliger If IDE or SCSI support is enabled (CONFIG_CMD_IDE or 887218ca724SWolfgang Denk CONFIG_CMD_SCSI) you must configure support for at 888218ca724SWolfgang Denk least one partition type as well. 889c609719bSwdenk 890c609719bSwdenk- IDE Reset method: 8914d13cbadSwdenk CONFIG_IDE_RESET_ROUTINE - this is defined in several 8924d13cbadSwdenk board configurations files but used nowhere! 893c609719bSwdenk 8944d13cbadSwdenk CONFIG_IDE_RESET - is this is defined, IDE Reset will 8954d13cbadSwdenk be performed by calling the function 8964d13cbadSwdenk ide_set_reset(int reset) 8974d13cbadSwdenk which has to be defined in a board specific file 898c609719bSwdenk 899c609719bSwdenk- ATAPI Support: 900c609719bSwdenk CONFIG_ATAPI 901c609719bSwdenk 902c609719bSwdenk Set this to enable ATAPI support. 903c609719bSwdenk 904c40b2956Swdenk- LBA48 Support 905c40b2956Swdenk CONFIG_LBA48 906c40b2956Swdenk 907c40b2956Swdenk Set this to enable support for disks larger than 137GB 9084b142febSHeiko Schocher Also look at CONFIG_SYS_64BIT_LBA. 909c40b2956Swdenk Whithout these , LBA48 support uses 32bit variables and will 'only' 910c40b2956Swdenk support disks up to 2.1TB. 911c40b2956Swdenk 9126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_64BIT_LBA: 913c40b2956Swdenk When enabled, makes the IDE subsystem use 64bit sector addresses. 914c40b2956Swdenk Default is 32bit. 915c40b2956Swdenk 916c609719bSwdenk- SCSI Support: 917c609719bSwdenk At the moment only there is only support for the 918c609719bSwdenk SYM53C8XX SCSI controller; define 919c609719bSwdenk CONFIG_SCSI_SYM53C8XX to enable it. 920c609719bSwdenk 9216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and 9226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID * 9236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the 924c609719bSwdenk maximum numbers of LUNs, SCSI ID's and target 925c609719bSwdenk devices. 9266d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz) 927c609719bSwdenk 928c609719bSwdenk- NETWORK Support (PCI): 929682011ffSwdenk CONFIG_E1000 930682011ffSwdenk Support for Intel 8254x gigabit chips. 931682011ffSwdenk 932ac3315c2SAndre Schwarz CONFIG_E1000_FALLBACK_MAC 93311ccc33fSMarcel Ziswiler default MAC for empty EEPROM after production. 934ac3315c2SAndre Schwarz 935c609719bSwdenk CONFIG_EEPRO100 936c609719bSwdenk Support for Intel 82557/82559/82559ER chips. 93711ccc33fSMarcel Ziswiler Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM 938c609719bSwdenk write routine for first time initialisation. 939c609719bSwdenk 940c609719bSwdenk CONFIG_TULIP 941c609719bSwdenk Support for Digital 2114x chips. 942c609719bSwdenk Optional CONFIG_TULIP_SELECT_MEDIA for board specific 943c609719bSwdenk modem chip initialisation (KS8761/QS6611). 944c609719bSwdenk 945c609719bSwdenk CONFIG_NATSEMI 946c609719bSwdenk Support for National dp83815 chips. 947c609719bSwdenk 948c609719bSwdenk CONFIG_NS8382X 949c609719bSwdenk Support for National dp8382[01] gigabit chips. 950c609719bSwdenk 95145219c46Swdenk- NETWORK Support (other): 95245219c46Swdenk 953c041e9d2SJens Scharsig CONFIG_DRIVER_AT91EMAC 954c041e9d2SJens Scharsig Support for AT91RM9200 EMAC. 955c041e9d2SJens Scharsig 956c041e9d2SJens Scharsig CONFIG_RMII 957c041e9d2SJens Scharsig Define this to use reduced MII inteface 958c041e9d2SJens Scharsig 959c041e9d2SJens Scharsig CONFIG_DRIVER_AT91EMAC_QUIET 960c041e9d2SJens Scharsig If this defined, the driver is quiet. 961c041e9d2SJens Scharsig The driver doen't show link status messages. 962c041e9d2SJens Scharsig 96345219c46Swdenk CONFIG_DRIVER_LAN91C96 96445219c46Swdenk Support for SMSC's LAN91C96 chips. 96545219c46Swdenk 96645219c46Swdenk CONFIG_LAN91C96_BASE 96745219c46Swdenk Define this to hold the physical address 96845219c46Swdenk of the LAN91C96's I/O space 96945219c46Swdenk 97045219c46Swdenk CONFIG_LAN91C96_USE_32_BIT 97145219c46Swdenk Define this to enable 32 bit addressing 97245219c46Swdenk 973f39748aeSwdenk CONFIG_DRIVER_SMC91111 974f39748aeSwdenk Support for SMSC's LAN91C111 chip 975f39748aeSwdenk 976f39748aeSwdenk CONFIG_SMC91111_BASE 977f39748aeSwdenk Define this to hold the physical address 978f39748aeSwdenk of the device (I/O space) 979f39748aeSwdenk 980f39748aeSwdenk CONFIG_SMC_USE_32_BIT 981f39748aeSwdenk Define this if data bus is 32 bits 982f39748aeSwdenk 983f39748aeSwdenk CONFIG_SMC_USE_IOFUNCS 984f39748aeSwdenk Define this to use i/o functions instead of macros 985f39748aeSwdenk (some hardware wont work with macros) 986f39748aeSwdenk 987b3dbf4a5SMacpaul Lin CONFIG_FTGMAC100 988b3dbf4a5SMacpaul Lin Support for Faraday's FTGMAC100 Gigabit SoC Ethernet 989b3dbf4a5SMacpaul Lin 990b3dbf4a5SMacpaul Lin CONFIG_FTGMAC100_EGIGA 991b3dbf4a5SMacpaul Lin Define this to use GE link update with gigabit PHY. 992b3dbf4a5SMacpaul Lin Define this if FTGMAC100 is connected to gigabit PHY. 993b3dbf4a5SMacpaul Lin If your system has 10/100 PHY only, it might not occur 994b3dbf4a5SMacpaul Lin wrong behavior. Because PHY usually return timeout or 995b3dbf4a5SMacpaul Lin useless data when polling gigabit status and gigabit 996b3dbf4a5SMacpaul Lin control registers. This behavior won't affect the 997b3dbf4a5SMacpaul Lin correctnessof 10/100 link speed update. 998b3dbf4a5SMacpaul Lin 999c2fff331SMike Rapoport CONFIG_SMC911X 1000557b377dSJens Gehrlein Support for SMSC's LAN911x and LAN921x chips 1001557b377dSJens Gehrlein 1002c2fff331SMike Rapoport CONFIG_SMC911X_BASE 1003557b377dSJens Gehrlein Define this to hold the physical address 1004557b377dSJens Gehrlein of the device (I/O space) 1005557b377dSJens Gehrlein 1006c2fff331SMike Rapoport CONFIG_SMC911X_32_BIT 1007557b377dSJens Gehrlein Define this if data bus is 32 bits 1008557b377dSJens Gehrlein 1009c2fff331SMike Rapoport CONFIG_SMC911X_16_BIT 1010557b377dSJens Gehrlein Define this if data bus is 16 bits. If your processor 1011557b377dSJens Gehrlein automatically converts one 32 bit word to two 16 bit 1012c2fff331SMike Rapoport words you may also try CONFIG_SMC911X_32_BIT. 1013557b377dSJens Gehrlein 10143d0075faSYoshihiro Shimoda CONFIG_SH_ETHER 10153d0075faSYoshihiro Shimoda Support for Renesas on-chip Ethernet controller 10163d0075faSYoshihiro Shimoda 10173d0075faSYoshihiro Shimoda CONFIG_SH_ETHER_USE_PORT 10183d0075faSYoshihiro Shimoda Define the number of ports to be used 10193d0075faSYoshihiro Shimoda 10203d0075faSYoshihiro Shimoda CONFIG_SH_ETHER_PHY_ADDR 10213d0075faSYoshihiro Shimoda Define the ETH PHY's address 10223d0075faSYoshihiro Shimoda 102368260aabSYoshihiro Shimoda CONFIG_SH_ETHER_CACHE_WRITEBACK 102468260aabSYoshihiro Shimoda If this option is set, the driver enables cache flush. 102568260aabSYoshihiro Shimoda 1026c609719bSwdenk- USB Support: 1027c609719bSwdenk At the moment only the UHCI host controller is 10284d13cbadSwdenk supported (PIP405, MIP405, MPC5200); define 1029c609719bSwdenk CONFIG_USB_UHCI to enable it. 1030c609719bSwdenk define CONFIG_USB_KEYBOARD to enable the USB Keyboard 103130d56faeSwdenk and define CONFIG_USB_STORAGE to enable the USB 1032c609719bSwdenk storage devices. 1033c609719bSwdenk Note: 1034c609719bSwdenk Supported are USB Keyboards and USB Floppy drives 1035c609719bSwdenk (TEAC FD-05PUB). 10364d13cbadSwdenk MPC5200 USB requires additional defines: 10374d13cbadSwdenk CONFIG_USB_CLOCK 10384d13cbadSwdenk for 528 MHz Clock: 0x0001bbbb 1039307ecb6dSEric Millbrandt CONFIG_PSC3_USB 1040307ecb6dSEric Millbrandt for USB on PSC3 10414d13cbadSwdenk CONFIG_USB_CONFIG 10424d13cbadSwdenk for differential drivers: 0x00001000 10434d13cbadSwdenk for single ended drivers: 0x00005000 1044307ecb6dSEric Millbrandt for differential drivers on PSC3: 0x00000100 1045307ecb6dSEric Millbrandt for single ended drivers on PSC3: 0x00004100 10466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_USB_EVENT_POLL 1047fdcfaa1bSZhang Wei May be defined to allow interrupt polling 1048fdcfaa1bSZhang Wei instead of using asynchronous interrupts 10494d13cbadSwdenk 105016c8d5e7SWolfgang Denk- USB Device: 105116c8d5e7SWolfgang Denk Define the below if you wish to use the USB console. 105216c8d5e7SWolfgang Denk Once firmware is rebuilt from a serial console issue the 105316c8d5e7SWolfgang Denk command "setenv stdin usbtty; setenv stdout usbtty" and 105411ccc33fSMarcel Ziswiler attach your USB cable. The Unix command "dmesg" should print 105516c8d5e7SWolfgang Denk it has found a new device. The environment variable usbtty 105616c8d5e7SWolfgang Denk can be set to gserial or cdc_acm to enable your device to 105716c8d5e7SWolfgang Denk appear to a USB host as a Linux gserial device or a 105816c8d5e7SWolfgang Denk Common Device Class Abstract Control Model serial device. 105916c8d5e7SWolfgang Denk If you select usbtty = gserial you should be able to enumerate 106016c8d5e7SWolfgang Denk a Linux host by 106116c8d5e7SWolfgang Denk # modprobe usbserial vendor=0xVendorID product=0xProductID 106216c8d5e7SWolfgang Denk else if using cdc_acm, simply setting the environment 106316c8d5e7SWolfgang Denk variable usbtty to be cdc_acm should suffice. The following 106416c8d5e7SWolfgang Denk might be defined in YourBoardName.h 106516c8d5e7SWolfgang Denk 106616c8d5e7SWolfgang Denk CONFIG_USB_DEVICE 106716c8d5e7SWolfgang Denk Define this to build a UDC device 106816c8d5e7SWolfgang Denk 106916c8d5e7SWolfgang Denk CONFIG_USB_TTY 107016c8d5e7SWolfgang Denk Define this to have a tty type of device available to 107116c8d5e7SWolfgang Denk talk to the UDC device 107216c8d5e7SWolfgang Denk 10736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_CONSOLE_IS_IN_ENV 107416c8d5e7SWolfgang Denk Define this if you want stdin, stdout &/or stderr to 107516c8d5e7SWolfgang Denk be set to usbtty. 107616c8d5e7SWolfgang Denk 107716c8d5e7SWolfgang Denk mpc8xx: 10786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_USB_EXTC_CLK 0xBLAH 107916c8d5e7SWolfgang Denk Derive USB clock from external clock "blah" 10806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_USB_EXTC_CLK 0x02 108116c8d5e7SWolfgang Denk 10826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_USB_BRG_CLK 0xBLAH 108316c8d5e7SWolfgang Denk Derive USB clock from brgclk 10846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_USB_BRG_CLK 0x04 108516c8d5e7SWolfgang Denk 108616c8d5e7SWolfgang Denk If you have a USB-IF assigned VendorID then you may wish to 108716c8d5e7SWolfgang Denk define your own vendor specific values either in BoardName.h 108816c8d5e7SWolfgang Denk or directly in usbd_vendor_info.h. If you don't define 108916c8d5e7SWolfgang Denk CONFIG_USBD_MANUFACTURER, CONFIG_USBD_PRODUCT_NAME, 109016c8d5e7SWolfgang Denk CONFIG_USBD_VENDORID and CONFIG_USBD_PRODUCTID, then U-Boot 109116c8d5e7SWolfgang Denk should pretend to be a Linux device to it's target host. 109216c8d5e7SWolfgang Denk 109316c8d5e7SWolfgang Denk CONFIG_USBD_MANUFACTURER 109416c8d5e7SWolfgang Denk Define this string as the name of your company for 109516c8d5e7SWolfgang Denk - CONFIG_USBD_MANUFACTURER "my company" 109616c8d5e7SWolfgang Denk 109716c8d5e7SWolfgang Denk CONFIG_USBD_PRODUCT_NAME 109816c8d5e7SWolfgang Denk Define this string as the name of your product 109916c8d5e7SWolfgang Denk - CONFIG_USBD_PRODUCT_NAME "acme usb device" 110016c8d5e7SWolfgang Denk 110116c8d5e7SWolfgang Denk CONFIG_USBD_VENDORID 110216c8d5e7SWolfgang Denk Define this as your assigned Vendor ID from the USB 110316c8d5e7SWolfgang Denk Implementors Forum. This *must* be a genuine Vendor ID 110416c8d5e7SWolfgang Denk to avoid polluting the USB namespace. 110516c8d5e7SWolfgang Denk - CONFIG_USBD_VENDORID 0xFFFF 110616c8d5e7SWolfgang Denk 110716c8d5e7SWolfgang Denk CONFIG_USBD_PRODUCTID 110816c8d5e7SWolfgang Denk Define this as the unique Product ID 110916c8d5e7SWolfgang Denk for your device 111016c8d5e7SWolfgang Denk - CONFIG_USBD_PRODUCTID 0xFFFF 1111c609719bSwdenk 1112c609719bSwdenk 1113c609719bSwdenk- MMC Support: 1114c609719bSwdenk The MMC controller on the Intel PXA is supported. To 1115c609719bSwdenk enable this define CONFIG_MMC. The MMC can be 1116c609719bSwdenk accessed from the boot prompt by mapping the device 1117c609719bSwdenk to physical memory similar to flash. Command line is 1118602ad3b3SJon Loeliger enabled with CONFIG_CMD_MMC. The MMC driver also works with 1119602ad3b3SJon Loeliger the FAT fs. This is enabled with CONFIG_CMD_FAT. 1120c609719bSwdenk 1121afb35666SYoshihiro Shimoda CONFIG_SH_MMCIF 1122afb35666SYoshihiro Shimoda Support for Renesas on-chip MMCIF controller 1123afb35666SYoshihiro Shimoda 1124afb35666SYoshihiro Shimoda CONFIG_SH_MMCIF_ADDR 1125afb35666SYoshihiro Shimoda Define the base address of MMCIF registers 1126afb35666SYoshihiro Shimoda 1127afb35666SYoshihiro Shimoda CONFIG_SH_MMCIF_CLK 1128afb35666SYoshihiro Shimoda Define the clock frequency for MMCIF 1129afb35666SYoshihiro Shimoda 11306705d81eSwdenk- Journaling Flash filesystem support: 11316705d81eSwdenk CONFIG_JFFS2_NAND, CONFIG_JFFS2_NAND_OFF, CONFIG_JFFS2_NAND_SIZE, 11326705d81eSwdenk CONFIG_JFFS2_NAND_DEV 11336705d81eSwdenk Define these for a default partition on a NAND device 11346705d81eSwdenk 11356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_JFFS2_FIRST_SECTOR, 11366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_JFFS2_FIRST_BANK, CONFIG_SYS_JFFS2_NUM_BANKS 11376705d81eSwdenk Define these for a default partition on a NOR device 11386705d81eSwdenk 11396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_JFFS_CUSTOM_PART 11406705d81eSwdenk Define this to create an own partition. You have to provide a 11416705d81eSwdenk function struct part_info* jffs2_part_info(int part_num) 11426705d81eSwdenk 11436705d81eSwdenk If you define only one JFFS2 partition you may also want to 11446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_JFFS_SINGLE_PART 1 11456705d81eSwdenk to disable the command chpart. This is the default when you 11466705d81eSwdenk have not defined a custom partition 11476705d81eSwdenk 1148c609719bSwdenk- Keyboard Support: 1149c609719bSwdenk CONFIG_ISA_KEYBOARD 1150c609719bSwdenk 1151c609719bSwdenk Define this to enable standard (PC-Style) keyboard 1152c609719bSwdenk support 1153c609719bSwdenk 1154c609719bSwdenk CONFIG_I8042_KBD 1155c609719bSwdenk Standard PC keyboard driver with US (is default) and 1156c609719bSwdenk GERMAN key layout (switch via environment 'keymap=de') support. 1157c609719bSwdenk Export function i8042_kbd_init, i8042_tstc and i8042_getc 1158c609719bSwdenk for cfb_console. Supports cursor blinking. 1159c609719bSwdenk 1160c609719bSwdenk- Video support: 1161c609719bSwdenk CONFIG_VIDEO 1162c609719bSwdenk 1163c609719bSwdenk Define this to enable video support (for output to 1164c609719bSwdenk video). 1165c609719bSwdenk 1166c609719bSwdenk CONFIG_VIDEO_CT69000 1167c609719bSwdenk 1168c609719bSwdenk Enable Chips & Technologies 69000 Video chip 1169c609719bSwdenk 1170c609719bSwdenk CONFIG_VIDEO_SMI_LYNXEM 1171eeb1b77bSwdenk Enable Silicon Motion SMI 712/710/810 Video chip. The 1172eeb1b77bSwdenk video output is selected via environment 'videoout' 1173eeb1b77bSwdenk (1 = LCD and 2 = CRT). If videoout is undefined, CRT is 1174eeb1b77bSwdenk assumed. 1175c609719bSwdenk 1176eeb1b77bSwdenk For the CT69000 and SMI_LYNXEM drivers, videomode is 117711ccc33fSMarcel Ziswiler selected via environment 'videomode'. Two different ways 1178eeb1b77bSwdenk are possible: 1179eeb1b77bSwdenk - "videomode=num" 'num' is a standard LiLo mode numbers. 1180eeb1b77bSwdenk Following standard modes are supported (* is default): 1181eeb1b77bSwdenk 1182eeb1b77bSwdenk Colors 640x480 800x600 1024x768 1152x864 1280x1024 1183eeb1b77bSwdenk -------------+--------------------------------------------- 1184eeb1b77bSwdenk 8 bits | 0x301* 0x303 0x305 0x161 0x307 1185eeb1b77bSwdenk 15 bits | 0x310 0x313 0x316 0x162 0x319 1186eeb1b77bSwdenk 16 bits | 0x311 0x314 0x317 0x163 0x31A 1187eeb1b77bSwdenk 24 bits | 0x312 0x315 0x318 ? 0x31B 1188eeb1b77bSwdenk -------------+--------------------------------------------- 1189c609719bSwdenk (i.e. setenv videomode 317; saveenv; reset;) 1190c609719bSwdenk 1191eeb1b77bSwdenk - "videomode=bootargs" all the video parameters are parsed 11927817cb20SMarcel Ziswiler from the bootargs. (See drivers/video/videomodes.c) 1193eeb1b77bSwdenk 1194eeb1b77bSwdenk 1195a6c7ad2fSwdenk CONFIG_VIDEO_SED13806 1196a6c7ad2fSwdenk Enable Epson SED13806 driver. This driver supports 8bpp 1197a6c7ad2fSwdenk and 16bpp modes defined by CONFIG_VIDEO_SED13806_8BPP 1198a6c7ad2fSwdenk or CONFIG_VIDEO_SED13806_16BPP 1199a6c7ad2fSwdenk 12007d3053fbSTimur Tabi CONFIG_FSL_DIU_FB 12017d3053fbSTimur Tabi Enable the Freescale DIU video driver. Reference boards for 12027d3053fbSTimur Tabi SOCs that have a DIU should define this macro to enable DIU 12037d3053fbSTimur Tabi support, and should also define these other macros: 12047d3053fbSTimur Tabi 12057d3053fbSTimur Tabi CONFIG_SYS_DIU_ADDR 12067d3053fbSTimur Tabi CONFIG_VIDEO 12077d3053fbSTimur Tabi CONFIG_CMD_BMP 12087d3053fbSTimur Tabi CONFIG_CFB_CONSOLE 12097d3053fbSTimur Tabi CONFIG_VIDEO_SW_CURSOR 12107d3053fbSTimur Tabi CONFIG_VGA_AS_SINGLE_DEVICE 12117d3053fbSTimur Tabi CONFIG_VIDEO_LOGO 12127d3053fbSTimur Tabi CONFIG_VIDEO_BMP_LOGO 12137d3053fbSTimur Tabi 1214ba8e76bdSTimur Tabi The DIU driver will look for the 'video-mode' environment 1215ba8e76bdSTimur Tabi variable, and if defined, enable the DIU as a console during 1216ba8e76bdSTimur Tabi boot. See the documentation file README.video for a 1217ba8e76bdSTimur Tabi description of this variable. 12187d3053fbSTimur Tabi 1219682011ffSwdenk- Keyboard Support: 1220682011ffSwdenk CONFIG_KEYBOARD 1221682011ffSwdenk 1222682011ffSwdenk Define this to enable a custom keyboard support. 1223682011ffSwdenk This simply calls drv_keyboard_init() which must be 1224682011ffSwdenk defined in your board-specific files. 1225682011ffSwdenk The only board using this so far is RBC823. 1226a6c7ad2fSwdenk 1227c609719bSwdenk- LCD Support: CONFIG_LCD 1228c609719bSwdenk 1229c609719bSwdenk Define this to enable LCD support (for output to LCD 1230c609719bSwdenk display); also select one of the supported displays 1231c609719bSwdenk by defining one of these: 1232c609719bSwdenk 123339cf4804SStelian Pop CONFIG_ATMEL_LCD: 123439cf4804SStelian Pop 123539cf4804SStelian Pop HITACHI TX09D70VM1CCA, 3.5", 240x320. 123639cf4804SStelian Pop 1237fd3103bbSwdenk CONFIG_NEC_NL6448AC33: 1238c609719bSwdenk 1239fd3103bbSwdenk NEC NL6448AC33-18. Active, color, single scan. 1240c609719bSwdenk 1241fd3103bbSwdenk CONFIG_NEC_NL6448BC20 1242c609719bSwdenk 1243fd3103bbSwdenk NEC NL6448BC20-08. 6.5", 640x480. 1244fd3103bbSwdenk Active, color, single scan. 1245fd3103bbSwdenk 1246fd3103bbSwdenk CONFIG_NEC_NL6448BC33_54 1247fd3103bbSwdenk 1248fd3103bbSwdenk NEC NL6448BC33-54. 10.4", 640x480. 1249c609719bSwdenk Active, color, single scan. 1250c609719bSwdenk 1251c609719bSwdenk CONFIG_SHARP_16x9 1252c609719bSwdenk 1253c609719bSwdenk Sharp 320x240. Active, color, single scan. 1254c609719bSwdenk It isn't 16x9, and I am not sure what it is. 1255c609719bSwdenk 1256c609719bSwdenk CONFIG_SHARP_LQ64D341 1257c609719bSwdenk 1258c609719bSwdenk Sharp LQ64D341 display, 640x480. 1259c609719bSwdenk Active, color, single scan. 1260c609719bSwdenk 1261c609719bSwdenk CONFIG_HLD1045 1262c609719bSwdenk 1263c609719bSwdenk HLD1045 display, 640x480. 1264c609719bSwdenk Active, color, single scan. 1265c609719bSwdenk 1266c609719bSwdenk CONFIG_OPTREX_BW 1267c609719bSwdenk 1268c609719bSwdenk Optrex CBL50840-2 NF-FW 99 22 M5 1269c609719bSwdenk or 1270c609719bSwdenk Hitachi LMG6912RPFC-00T 1271c609719bSwdenk or 1272c609719bSwdenk Hitachi SP14Q002 1273c609719bSwdenk 1274c609719bSwdenk 320x240. Black & white. 1275c609719bSwdenk 1276c609719bSwdenk Normally display is black on white background; define 12776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_WHITE_ON_BLACK to get it inverted. 1278c609719bSwdenk 12797152b1d0Swdenk- Splash Screen Support: CONFIG_SPLASH_SCREEN 1280d791b1dcSwdenk 1281d791b1dcSwdenk If this option is set, the environment is checked for 1282d791b1dcSwdenk a variable "splashimage". If found, the usual display 1283d791b1dcSwdenk of logo, copyright and system information on the LCD 1284e94d2cd9Swdenk is suppressed and the BMP image at the address 1285d791b1dcSwdenk specified in "splashimage" is loaded instead. The 1286d791b1dcSwdenk console is redirected to the "nulldev", too. This 1287d791b1dcSwdenk allows for a "silent" boot where a splash screen is 1288d791b1dcSwdenk loaded very quickly after power-on. 1289d791b1dcSwdenk 12901ca298ceSMatthias Weisser CONFIG_SPLASH_SCREEN_ALIGN 12911ca298ceSMatthias Weisser 12921ca298ceSMatthias Weisser If this option is set the splash image can be freely positioned 12931ca298ceSMatthias Weisser on the screen. Environment variable "splashpos" specifies the 12941ca298ceSMatthias Weisser position as "x,y". If a positive number is given it is used as 12951ca298ceSMatthias Weisser number of pixel from left/top. If a negative number is given it 12961ca298ceSMatthias Weisser is used as number of pixel from right/bottom. You can also 12971ca298ceSMatthias Weisser specify 'm' for centering the image. 12981ca298ceSMatthias Weisser 12991ca298ceSMatthias Weisser Example: 13001ca298ceSMatthias Weisser setenv splashpos m,m 13011ca298ceSMatthias Weisser => image at center of screen 13021ca298ceSMatthias Weisser 13031ca298ceSMatthias Weisser setenv splashpos 30,20 13041ca298ceSMatthias Weisser => image at x = 30 and y = 20 13051ca298ceSMatthias Weisser 13061ca298ceSMatthias Weisser setenv splashpos -10,m 13071ca298ceSMatthias Weisser => vertically centered image 13081ca298ceSMatthias Weisser at x = dspWidth - bmpWidth - 9 13091ca298ceSMatthias Weisser 131098f4a3dfSStefan Roese- Gzip compressed BMP image support: CONFIG_VIDEO_BMP_GZIP 131198f4a3dfSStefan Roese 131298f4a3dfSStefan Roese If this option is set, additionally to standard BMP 131398f4a3dfSStefan Roese images, gzipped BMP images can be displayed via the 131498f4a3dfSStefan Roese splashscreen support or the bmp command. 131598f4a3dfSStefan Roese 1316d5011762SAnatolij Gustschin- Run length encoded BMP image (RLE8) support: CONFIG_VIDEO_BMP_RLE8 1317d5011762SAnatolij Gustschin 1318d5011762SAnatolij Gustschin If this option is set, 8-bit RLE compressed BMP images 1319d5011762SAnatolij Gustschin can be displayed via the splashscreen support or the 1320d5011762SAnatolij Gustschin bmp command. 1321d5011762SAnatolij Gustschin 1322c29fdfc1Swdenk- Compression support: 1323c29fdfc1Swdenk CONFIG_BZIP2 1324c29fdfc1Swdenk 1325c29fdfc1Swdenk If this option is set, support for bzip2 compressed 1326c29fdfc1Swdenk images is included. If not, only uncompressed and gzip 1327c29fdfc1Swdenk compressed images are supported. 1328c29fdfc1Swdenk 1329c29fdfc1Swdenk NOTE: the bzip2 algorithm requires a lot of RAM, so 13306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should 1331c29fdfc1Swdenk be at least 4MB. 1332d791b1dcSwdenk 1333fc9c1727SLuigi 'Comio' Mantellini CONFIG_LZMA 1334fc9c1727SLuigi 'Comio' Mantellini 1335fc9c1727SLuigi 'Comio' Mantellini If this option is set, support for lzma compressed 1336fc9c1727SLuigi 'Comio' Mantellini images is included. 1337fc9c1727SLuigi 'Comio' Mantellini 1338fc9c1727SLuigi 'Comio' Mantellini Note: The LZMA algorithm adds between 2 and 4KB of code and it 1339fc9c1727SLuigi 'Comio' Mantellini requires an amount of dynamic memory that is given by the 1340fc9c1727SLuigi 'Comio' Mantellini formula: 1341fc9c1727SLuigi 'Comio' Mantellini 1342fc9c1727SLuigi 'Comio' Mantellini (1846 + 768 << (lc + lp)) * sizeof(uint16) 1343fc9c1727SLuigi 'Comio' Mantellini 1344fc9c1727SLuigi 'Comio' Mantellini Where lc and lp stand for, respectively, Literal context bits 1345fc9c1727SLuigi 'Comio' Mantellini and Literal pos bits. 1346fc9c1727SLuigi 'Comio' Mantellini 1347fc9c1727SLuigi 'Comio' Mantellini This value is upper-bounded by 14MB in the worst case. Anyway, 1348fc9c1727SLuigi 'Comio' Mantellini for a ~4MB large kernel image, we have lc=3 and lp=0 for a 1349fc9c1727SLuigi 'Comio' Mantellini total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is 1350fc9c1727SLuigi 'Comio' Mantellini a very small buffer. 1351fc9c1727SLuigi 'Comio' Mantellini 1352fc9c1727SLuigi 'Comio' Mantellini Use the lzmainfo tool to determinate the lc and lp values and 1353fc9c1727SLuigi 'Comio' Mantellini then calculate the amount of needed dynamic memory (ensuring 13546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD the appropriate CONFIG_SYS_MALLOC_LEN value). 1355fc9c1727SLuigi 'Comio' Mantellini 135617ea1177Swdenk- MII/PHY support: 135717ea1177Swdenk CONFIG_PHY_ADDR 135817ea1177Swdenk 135917ea1177Swdenk The address of PHY on MII bus. 136017ea1177Swdenk 136117ea1177Swdenk CONFIG_PHY_CLOCK_FREQ (ppc4xx) 136217ea1177Swdenk 136317ea1177Swdenk The clock frequency of the MII bus 136417ea1177Swdenk 136517ea1177Swdenk CONFIG_PHY_GIGE 136617ea1177Swdenk 136717ea1177Swdenk If this option is set, support for speed/duplex 136811ccc33fSMarcel Ziswiler detection of gigabit PHY is included. 136917ea1177Swdenk 137017ea1177Swdenk CONFIG_PHY_RESET_DELAY 137117ea1177Swdenk 137217ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 137317ea1177Swdenk reset before any MII register access is possible. 137417ea1177Swdenk For such PHY, set this option to the usec delay 137517ea1177Swdenk required. (minimum 300usec for LXT971A) 137617ea1177Swdenk 137717ea1177Swdenk CONFIG_PHY_CMD_DELAY (ppc4xx) 137817ea1177Swdenk 137917ea1177Swdenk Some PHY like Intel LXT971A need extra delay after 138017ea1177Swdenk command issued before MII status register can be read 138117ea1177Swdenk 1382c609719bSwdenk- Ethernet address: 1383c609719bSwdenk CONFIG_ETHADDR 1384c68a05feSrichardretanubun CONFIG_ETH1ADDR 1385c609719bSwdenk CONFIG_ETH2ADDR 1386c609719bSwdenk CONFIG_ETH3ADDR 1387c68a05feSrichardretanubun CONFIG_ETH4ADDR 1388c68a05feSrichardretanubun CONFIG_ETH5ADDR 1389c609719bSwdenk 139011ccc33fSMarcel Ziswiler Define a default value for Ethernet address to use 139111ccc33fSMarcel Ziswiler for the respective Ethernet interface, in case this 1392c609719bSwdenk is not determined automatically. 1393c609719bSwdenk 1394c609719bSwdenk- IP address: 1395c609719bSwdenk CONFIG_IPADDR 1396c609719bSwdenk 1397c609719bSwdenk Define a default value for the IP address to use for 139811ccc33fSMarcel Ziswiler the default Ethernet interface, in case this is not 1399c609719bSwdenk determined through e.g. bootp. 1400c609719bSwdenk 1401c609719bSwdenk- Server IP address: 1402c609719bSwdenk CONFIG_SERVERIP 1403c609719bSwdenk 1404c609719bSwdenk Defines a default value for the IP address of a TFTP 1405c609719bSwdenk server to contact when using the "tftboot" command. 1406c609719bSwdenk 140797cfe861SRobin Getz CONFIG_KEEP_SERVERADDR 140897cfe861SRobin Getz 140997cfe861SRobin Getz Keeps the server's MAC address, in the env 'serveraddr' 141097cfe861SRobin Getz for passing to bootargs (like Linux's netconsole option) 141197cfe861SRobin Getz 141253a5c424SDavid Updegraff- Multicast TFTP Mode: 141353a5c424SDavid Updegraff CONFIG_MCAST_TFTP 141453a5c424SDavid Updegraff 141553a5c424SDavid Updegraff Defines whether you want to support multicast TFTP as per 141653a5c424SDavid Updegraff rfc-2090; for example to work with atftp. Lets lots of targets 141711ccc33fSMarcel Ziswiler tftp down the same boot image concurrently. Note: the Ethernet 141853a5c424SDavid Updegraff driver in use must provide a function: mcast() to join/leave a 141953a5c424SDavid Updegraff multicast group. 142053a5c424SDavid Updegraff 1421c609719bSwdenk- BOOTP Recovery Mode: 1422c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY 1423c609719bSwdenk 1424c609719bSwdenk If you have many targets in a network that try to 1425c609719bSwdenk boot using BOOTP, you may want to avoid that all 1426c609719bSwdenk systems send out BOOTP requests at precisely the same 1427c609719bSwdenk moment (which would happen for instance at recovery 1428c609719bSwdenk from a power failure, when all systems will try to 1429c609719bSwdenk boot, thus flooding the BOOTP server. Defining 1430c609719bSwdenk CONFIG_BOOTP_RANDOM_DELAY causes a random delay to be 1431c609719bSwdenk inserted before sending out BOOTP requests. The 14326c33c785SWolfgang Denk following delays are inserted then: 1433c609719bSwdenk 1434c609719bSwdenk 1st BOOTP request: delay 0 ... 1 sec 1435c609719bSwdenk 2nd BOOTP request: delay 0 ... 2 sec 1436c609719bSwdenk 3rd BOOTP request: delay 0 ... 4 sec 1437c609719bSwdenk 4th and following 1438c609719bSwdenk BOOTP requests: delay 0 ... 8 sec 1439c609719bSwdenk 1440fe389a82Sstroese- DHCP Advanced Options: 14411fe80d79SJon Loeliger You can fine tune the DHCP functionality by defining 14421fe80d79SJon Loeliger CONFIG_BOOTP_* symbols: 1443fe389a82Sstroese 14441fe80d79SJon Loeliger CONFIG_BOOTP_SUBNETMASK 14451fe80d79SJon Loeliger CONFIG_BOOTP_GATEWAY 14461fe80d79SJon Loeliger CONFIG_BOOTP_HOSTNAME 14471fe80d79SJon Loeliger CONFIG_BOOTP_NISDOMAIN 14481fe80d79SJon Loeliger CONFIG_BOOTP_BOOTPATH 14491fe80d79SJon Loeliger CONFIG_BOOTP_BOOTFILESIZE 14501fe80d79SJon Loeliger CONFIG_BOOTP_DNS 14511fe80d79SJon Loeliger CONFIG_BOOTP_DNS2 14521fe80d79SJon Loeliger CONFIG_BOOTP_SEND_HOSTNAME 14531fe80d79SJon Loeliger CONFIG_BOOTP_NTPSERVER 14541fe80d79SJon Loeliger CONFIG_BOOTP_TIMEOFFSET 14551fe80d79SJon Loeliger CONFIG_BOOTP_VENDOREX 1456fe389a82Sstroese 14575d110f0aSWilson Callan CONFIG_BOOTP_SERVERIP - TFTP server will be the serverip 14585d110f0aSWilson Callan environment variable, not the BOOTP server. 1459fe389a82Sstroese 1460fe389a82Sstroese CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS 1461fe389a82Sstroese serverip from a DHCP server, it is possible that more 1462fe389a82Sstroese than one DNS serverip is offered to the client. 1463fe389a82Sstroese If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS 1464fe389a82Sstroese serverip will be stored in the additional environment 1465fe389a82Sstroese variable "dnsip2". The first DNS serverip is always 1466fe389a82Sstroese stored in the variable "dnsip", when CONFIG_BOOTP_DNS 14671fe80d79SJon Loeliger is defined. 1468fe389a82Sstroese 1469fe389a82Sstroese CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable 1470fe389a82Sstroese to do a dynamic update of a DNS server. To do this, they 1471fe389a82Sstroese need the hostname of the DHCP requester. 14725d110f0aSWilson Callan If CONFIG_BOOTP_SEND_HOSTNAME is defined, the content 14731fe80d79SJon Loeliger of the "hostname" environment variable is passed as 14741fe80d79SJon Loeliger option 12 to the DHCP server. 1475fe389a82Sstroese 1476d9a2f416SAras Vaichas CONFIG_BOOTP_DHCP_REQUEST_DELAY 1477d9a2f416SAras Vaichas 1478d9a2f416SAras Vaichas A 32bit value in microseconds for a delay between 1479d9a2f416SAras Vaichas receiving a "DHCP Offer" and sending the "DHCP Request". 1480d9a2f416SAras Vaichas This fixes a problem with certain DHCP servers that don't 1481d9a2f416SAras Vaichas respond 100% of the time to a "DHCP request". E.g. On an 1482d9a2f416SAras Vaichas AT91RM9200 processor running at 180MHz, this delay needed 1483d9a2f416SAras Vaichas to be *at least* 15,000 usec before a Windows Server 2003 1484d9a2f416SAras Vaichas DHCP server would reply 100% of the time. I recommend at 1485d9a2f416SAras Vaichas least 50,000 usec to be safe. The alternative is to hope 1486d9a2f416SAras Vaichas that one of the retries will be successful but note that 1487d9a2f416SAras Vaichas the DHCP timeout and retry process takes a longer than 1488d9a2f416SAras Vaichas this delay. 1489d9a2f416SAras Vaichas 1490a3d991bdSwdenk - CDP Options: 1491a3d991bdSwdenk CONFIG_CDP_DEVICE_ID 1492a3d991bdSwdenk 1493a3d991bdSwdenk The device id used in CDP trigger frames. 1494a3d991bdSwdenk 1495a3d991bdSwdenk CONFIG_CDP_DEVICE_ID_PREFIX 1496a3d991bdSwdenk 1497a3d991bdSwdenk A two character string which is prefixed to the MAC address 1498a3d991bdSwdenk of the device. 1499a3d991bdSwdenk 1500a3d991bdSwdenk CONFIG_CDP_PORT_ID 1501a3d991bdSwdenk 1502a3d991bdSwdenk A printf format string which contains the ascii name of 1503a3d991bdSwdenk the port. Normally is set to "eth%d" which sets 150411ccc33fSMarcel Ziswiler eth0 for the first Ethernet, eth1 for the second etc. 1505a3d991bdSwdenk 1506a3d991bdSwdenk CONFIG_CDP_CAPABILITIES 1507a3d991bdSwdenk 1508a3d991bdSwdenk A 32bit integer which indicates the device capabilities; 1509a3d991bdSwdenk 0x00000010 for a normal host which does not forwards. 1510a3d991bdSwdenk 1511a3d991bdSwdenk CONFIG_CDP_VERSION 1512a3d991bdSwdenk 1513a3d991bdSwdenk An ascii string containing the version of the software. 1514a3d991bdSwdenk 1515a3d991bdSwdenk CONFIG_CDP_PLATFORM 1516a3d991bdSwdenk 1517a3d991bdSwdenk An ascii string containing the name of the platform. 1518a3d991bdSwdenk 1519a3d991bdSwdenk CONFIG_CDP_TRIGGER 1520a3d991bdSwdenk 1521a3d991bdSwdenk A 32bit integer sent on the trigger. 1522a3d991bdSwdenk 1523a3d991bdSwdenk CONFIG_CDP_POWER_CONSUMPTION 1524a3d991bdSwdenk 1525a3d991bdSwdenk A 16bit integer containing the power consumption of the 1526a3d991bdSwdenk device in .1 of milliwatts. 1527a3d991bdSwdenk 1528a3d991bdSwdenk CONFIG_CDP_APPLIANCE_VLAN_TYPE 1529a3d991bdSwdenk 1530a3d991bdSwdenk A byte containing the id of the VLAN. 1531a3d991bdSwdenk 1532c609719bSwdenk- Status LED: CONFIG_STATUS_LED 1533c609719bSwdenk 1534c609719bSwdenk Several configurations allow to display the current 1535c609719bSwdenk status using a LED. For instance, the LED will blink 1536c609719bSwdenk fast while running U-Boot code, stop blinking as 1537c609719bSwdenk soon as a reply to a BOOTP request was received, and 1538c609719bSwdenk start blinking slow once the Linux kernel is running 1539c609719bSwdenk (supported by a status LED driver in the Linux 1540c609719bSwdenk kernel). Defining CONFIG_STATUS_LED enables this 1541c609719bSwdenk feature in U-Boot. 1542c609719bSwdenk 1543c609719bSwdenk- CAN Support: CONFIG_CAN_DRIVER 1544c609719bSwdenk 1545c609719bSwdenk Defining CONFIG_CAN_DRIVER enables CAN driver support 1546c609719bSwdenk on those systems that support this (optional) 1547c609719bSwdenk feature, like the TQM8xxL modules. 1548c609719bSwdenk 1549c609719bSwdenk- I2C Support: CONFIG_HARD_I2C | CONFIG_SOFT_I2C 1550c609719bSwdenk 1551b37c7e5eSwdenk These enable I2C serial bus commands. Defining either of 1552b37c7e5eSwdenk (but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will 155311ccc33fSMarcel Ziswiler include the appropriate I2C driver for the selected CPU. 1554c609719bSwdenk 1555b37c7e5eSwdenk This will allow you to use i2c commands at the u-boot 1556602ad3b3SJon Loeliger command line (as long as you set CONFIG_CMD_I2C in 1557b37c7e5eSwdenk CONFIG_COMMANDS) and communicate with i2c based realtime 1558b37c7e5eSwdenk clock chips. See common/cmd_i2c.c for a description of the 1559c609719bSwdenk command line interface. 1560c609719bSwdenk 1561bb99ad6dSBen Warren CONFIG_HARD_I2C selects a hardware I2C controller. 1562c609719bSwdenk 1563b37c7e5eSwdenk CONFIG_SOFT_I2C configures u-boot to use a software (aka 1564b37c7e5eSwdenk bit-banging) driver instead of CPM or similar hardware 1565b37c7e5eSwdenk support for I2C. 1566c609719bSwdenk 1567b37c7e5eSwdenk There are several other quantities that must also be 1568b37c7e5eSwdenk defined when you define CONFIG_HARD_I2C or CONFIG_SOFT_I2C. 1569c609719bSwdenk 15706d0f6bcfSJean-Christophe PLAGNIOL-VILLARD In both cases you will need to define CONFIG_SYS_I2C_SPEED 1571b37c7e5eSwdenk to be the frequency (in Hz) at which you wish your i2c bus 15726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD to run and CONFIG_SYS_I2C_SLAVE to be the address of this node (ie 157311ccc33fSMarcel Ziswiler the CPU's i2c node address). 1574c609719bSwdenk 15758d321b81SPeter Tyser Now, the u-boot i2c code for the mpc8xx 1576a47a12beSStefan Roese (arch/powerpc/cpu/mpc8xx/i2c.c) sets the CPU up as a master node 15778d321b81SPeter Tyser and so its address should therefore be cleared to 0 (See, 15788d321b81SPeter Tyser eg, MPC823e User's Manual p.16-473). So, set 15798d321b81SPeter Tyser CONFIG_SYS_I2C_SLAVE to 0. 1580b37c7e5eSwdenk 15815da71efaSEric Millbrandt CONFIG_SYS_I2C_INIT_MPC5XXX 15825da71efaSEric Millbrandt 15835da71efaSEric Millbrandt When a board is reset during an i2c bus transfer 15845da71efaSEric Millbrandt chips might think that the current transfer is still 15855da71efaSEric Millbrandt in progress. Reset the slave devices by sending start 15865da71efaSEric Millbrandt commands until the slave device responds. 15875da71efaSEric Millbrandt 1588b37c7e5eSwdenk That's all that's required for CONFIG_HARD_I2C. 1589b37c7e5eSwdenk 1590b37c7e5eSwdenk If you use the software i2c interface (CONFIG_SOFT_I2C) 1591b37c7e5eSwdenk then the following macros need to be defined (examples are 1592b37c7e5eSwdenk from include/configs/lwmon.h): 1593c609719bSwdenk 1594c609719bSwdenk I2C_INIT 1595c609719bSwdenk 1596b37c7e5eSwdenk (Optional). Any commands necessary to enable the I2C 1597c609719bSwdenk controller or configure ports. 1598c609719bSwdenk 1599b37c7e5eSwdenk eg: #define I2C_INIT (immr->im_cpm.cp_pbdir |= PB_SCL) 1600b37c7e5eSwdenk 1601c609719bSwdenk I2C_PORT 1602c609719bSwdenk 1603c609719bSwdenk (Only for MPC8260 CPU). The I/O port to use (the code 1604c609719bSwdenk assumes both bits are on the same port). Valid values 1605c609719bSwdenk are 0..3 for ports A..D. 1606c609719bSwdenk 1607c609719bSwdenk I2C_ACTIVE 1608c609719bSwdenk 1609c609719bSwdenk The code necessary to make the I2C data line active 1610c609719bSwdenk (driven). If the data line is open collector, this 1611c609719bSwdenk define can be null. 1612c609719bSwdenk 1613b37c7e5eSwdenk eg: #define I2C_ACTIVE (immr->im_cpm.cp_pbdir |= PB_SDA) 1614b37c7e5eSwdenk 1615c609719bSwdenk I2C_TRISTATE 1616c609719bSwdenk 1617c609719bSwdenk The code necessary to make the I2C data line tri-stated 1618c609719bSwdenk (inactive). If the data line is open collector, this 1619c609719bSwdenk define can be null. 1620c609719bSwdenk 1621b37c7e5eSwdenk eg: #define I2C_TRISTATE (immr->im_cpm.cp_pbdir &= ~PB_SDA) 1622b37c7e5eSwdenk 1623c609719bSwdenk I2C_READ 1624c609719bSwdenk 1625c609719bSwdenk Code that returns TRUE if the I2C data line is high, 1626c609719bSwdenk FALSE if it is low. 1627c609719bSwdenk 1628b37c7e5eSwdenk eg: #define I2C_READ ((immr->im_cpm.cp_pbdat & PB_SDA) != 0) 1629b37c7e5eSwdenk 1630c609719bSwdenk I2C_SDA(bit) 1631c609719bSwdenk 1632c609719bSwdenk If <bit> is TRUE, sets the I2C data line high. If it 1633c609719bSwdenk is FALSE, it clears it (low). 1634c609719bSwdenk 1635b37c7e5eSwdenk eg: #define I2C_SDA(bit) \ 1636b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SDA; \ 1637b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SDA 1638b37c7e5eSwdenk 1639c609719bSwdenk I2C_SCL(bit) 1640c609719bSwdenk 1641c609719bSwdenk If <bit> is TRUE, sets the I2C clock line high. If it 1642c609719bSwdenk is FALSE, it clears it (low). 1643c609719bSwdenk 1644b37c7e5eSwdenk eg: #define I2C_SCL(bit) \ 1645b37c7e5eSwdenk if(bit) immr->im_cpm.cp_pbdat |= PB_SCL; \ 1646b37c7e5eSwdenk else immr->im_cpm.cp_pbdat &= ~PB_SCL 1647b37c7e5eSwdenk 1648c609719bSwdenk I2C_DELAY 1649c609719bSwdenk 1650c609719bSwdenk This delay is invoked four times per clock cycle so this 1651c609719bSwdenk controls the rate of data transfer. The data rate thus 1652b37c7e5eSwdenk is 1 / (I2C_DELAY * 4). Often defined to be something 1653b37c7e5eSwdenk like: 1654b37c7e5eSwdenk 1655b37c7e5eSwdenk #define I2C_DELAY udelay(2) 1656c609719bSwdenk 1657793b5726SMike Frysinger CONFIG_SOFT_I2C_GPIO_SCL / CONFIG_SOFT_I2C_GPIO_SDA 1658793b5726SMike Frysinger 1659793b5726SMike Frysinger If your arch supports the generic GPIO framework (asm/gpio.h), 1660793b5726SMike Frysinger then you may alternatively define the two GPIOs that are to be 1661793b5726SMike Frysinger used as SCL / SDA. Any of the previous I2C_xxx macros will 1662793b5726SMike Frysinger have GPIO-based defaults assigned to them as appropriate. 1663793b5726SMike Frysinger 1664793b5726SMike Frysinger You should define these to the GPIO value as given directly to 1665793b5726SMike Frysinger the generic GPIO functions. 1666793b5726SMike Frysinger 16676d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_I2C_INIT_BOARD 166847cd00faSwdenk 166947cd00faSwdenk When a board is reset during an i2c bus transfer 167047cd00faSwdenk chips might think that the current transfer is still 167147cd00faSwdenk in progress. On some boards it is possible to access 167247cd00faSwdenk the i2c SCLK line directly, either by using the 167347cd00faSwdenk processor pin as a GPIO or by having a second pin 167447cd00faSwdenk connected to the bus. If this option is defined a 167547cd00faSwdenk custom i2c_init_board() routine in boards/xxx/board.c 167647cd00faSwdenk is run early in the boot sequence. 167747cd00faSwdenk 167826a33504SRichard Retanubun CONFIG_SYS_I2C_BOARD_LATE_INIT 167926a33504SRichard Retanubun 168026a33504SRichard Retanubun An alternative to CONFIG_SYS_I2C_INIT_BOARD. If this option is 168126a33504SRichard Retanubun defined a custom i2c_board_late_init() routine in 168226a33504SRichard Retanubun boards/xxx/board.c is run AFTER the operations in i2c_init() 168326a33504SRichard Retanubun is completed. This callpoint can be used to unreset i2c bus 168426a33504SRichard Retanubun using CPU i2c controller register accesses for CPUs whose i2c 168526a33504SRichard Retanubun controller provide such a method. It is called at the end of 168626a33504SRichard Retanubun i2c_init() to allow i2c_init operations to setup the i2c bus 168726a33504SRichard Retanubun controller on the CPU (e.g. setting bus speed & slave address). 168826a33504SRichard Retanubun 168917ea1177Swdenk CONFIG_I2CFAST (PPC405GP|PPC405EP only) 169017ea1177Swdenk 169117ea1177Swdenk This option enables configuration of bi_iic_fast[] flags 169217ea1177Swdenk in u-boot bd_info structure based on u-boot environment 169317ea1177Swdenk variable "i2cfast". (see also i2cfast) 169417ea1177Swdenk 1695bb99ad6dSBen Warren CONFIG_I2C_MULTI_BUS 1696bb99ad6dSBen Warren 1697bb99ad6dSBen Warren This option allows the use of multiple I2C buses, each of which 1698bb99ad6dSBen Warren must have a controller. At any point in time, only one bus is 1699bb99ad6dSBen Warren active. To switch to a different bus, use the 'i2c dev' command. 1700bb99ad6dSBen Warren Note that bus numbering is zero-based. 1701bb99ad6dSBen Warren 17026d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_I2C_NOPROBES 1703bb99ad6dSBen Warren 1704bb99ad6dSBen Warren This option specifies a list of I2C devices that will be skipped 17050f89c54bSPeter Tyser when the 'i2c probe' command is issued. If CONFIG_I2C_MULTI_BUS 17060f89c54bSPeter Tyser is set, specify a list of bus-device pairs. Otherwise, specify 17070f89c54bSPeter Tyser a 1D array of device addresses 1708bb99ad6dSBen Warren 1709bb99ad6dSBen Warren e.g. 1710bb99ad6dSBen Warren #undef CONFIG_I2C_MULTI_BUS 17116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_I2C_NOPROBES {0x50,0x68} 1712bb99ad6dSBen Warren 1713bb99ad6dSBen Warren will skip addresses 0x50 and 0x68 on a board with one I2C bus 1714bb99ad6dSBen Warren 1715bb99ad6dSBen Warren #define CONFIG_I2C_MULTI_BUS 17166d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_I2C_MULTI_NOPROBES {{0,0x50},{0,0x68},{1,0x54}} 1717bb99ad6dSBen Warren 1718bb99ad6dSBen Warren will skip addresses 0x50 and 0x68 on bus 0 and address 0x54 on bus 1 1719bb99ad6dSBen Warren 17206d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SPD_BUS_NUM 1721be5e6181STimur Tabi 1722be5e6181STimur Tabi If defined, then this indicates the I2C bus number for DDR SPD. 1723be5e6181STimur Tabi If not defined, then U-Boot assumes that SPD is on I2C bus 0. 1724be5e6181STimur Tabi 17256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_RTC_BUS_NUM 17260dc018ecSStefan Roese 17270dc018ecSStefan Roese If defined, then this indicates the I2C bus number for the RTC. 17280dc018ecSStefan Roese If not defined, then U-Boot assumes that RTC is on I2C bus 0. 17290dc018ecSStefan Roese 17306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_DTT_BUS_NUM 17310dc018ecSStefan Roese 17320dc018ecSStefan Roese If defined, then this indicates the I2C bus number for the DTT. 17330dc018ecSStefan Roese If not defined, then U-Boot assumes that DTT is on I2C bus 0. 17340dc018ecSStefan Roese 17356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_I2C_DTT_ADDR: 17369ebbb54fSVictor Gallardo 17379ebbb54fSVictor Gallardo If defined, specifies the I2C address of the DTT device. 17389ebbb54fSVictor Gallardo If not defined, then U-Boot uses predefined value for 17399ebbb54fSVictor Gallardo specified DTT device. 17409ebbb54fSVictor Gallardo 1741be5e6181STimur Tabi CONFIG_FSL_I2C 1742be5e6181STimur Tabi 1743be5e6181STimur Tabi Define this option if you want to use Freescale's I2C driver in 17447817cb20SMarcel Ziswiler drivers/i2c/fsl_i2c.c. 1745be5e6181STimur Tabi 174667b23a32SHeiko Schocher CONFIG_I2C_MUX 174767b23a32SHeiko Schocher 174867b23a32SHeiko Schocher Define this option if you have I2C devices reached over 1 .. n 174967b23a32SHeiko Schocher I2C Muxes like the pca9544a. This option addes a new I2C 175067b23a32SHeiko Schocher Command "i2c bus [muxtype:muxaddr:muxchannel]" which adds a 175167b23a32SHeiko Schocher new I2C Bus to the existing I2C Busses. If you select the 175267b23a32SHeiko Schocher new Bus with "i2c dev", u-bbot sends first the commandos for 175367b23a32SHeiko Schocher the muxes to activate this new "bus". 175467b23a32SHeiko Schocher 175567b23a32SHeiko Schocher CONFIG_I2C_MULTI_BUS must be also defined, to use this 175667b23a32SHeiko Schocher feature! 175767b23a32SHeiko Schocher 175867b23a32SHeiko Schocher Example: 175967b23a32SHeiko Schocher Adding a new I2C Bus reached over 2 pca9544a muxes 176067b23a32SHeiko Schocher The First mux with address 70 and channel 6 176167b23a32SHeiko Schocher The Second mux with address 71 and channel 4 176267b23a32SHeiko Schocher 176367b23a32SHeiko Schocher => i2c bus pca9544a:70:6:pca9544a:71:4 176467b23a32SHeiko Schocher 176567b23a32SHeiko Schocher Use the "i2c bus" command without parameter, to get a list 176667b23a32SHeiko Schocher of I2C Busses with muxes: 176767b23a32SHeiko Schocher 176867b23a32SHeiko Schocher => i2c bus 176967b23a32SHeiko Schocher Busses reached over muxes: 177067b23a32SHeiko Schocher Bus ID: 2 177167b23a32SHeiko Schocher reached over Mux(es): 177267b23a32SHeiko Schocher pca9544a@70 ch: 4 177367b23a32SHeiko Schocher Bus ID: 3 177467b23a32SHeiko Schocher reached over Mux(es): 177567b23a32SHeiko Schocher pca9544a@70 ch: 6 177667b23a32SHeiko Schocher pca9544a@71 ch: 4 177767b23a32SHeiko Schocher => 177867b23a32SHeiko Schocher 177967b23a32SHeiko Schocher If you now switch to the new I2C Bus 3 with "i2c dev 3" 1780f9a78b8dSMichael Jones u-boot first sends the command to the mux@70 to enable 1781f9a78b8dSMichael Jones channel 6, and then the command to the mux@71 to enable 178267b23a32SHeiko Schocher the channel 4. 178367b23a32SHeiko Schocher 178467b23a32SHeiko Schocher After that, you can use the "normal" i2c commands as 1785f9a78b8dSMichael Jones usual to communicate with your I2C devices behind 178667b23a32SHeiko Schocher the 2 muxes. 178767b23a32SHeiko Schocher 178867b23a32SHeiko Schocher This option is actually implemented for the bitbanging 178967b23a32SHeiko Schocher algorithm in common/soft_i2c.c and for the Hardware I2C 179067b23a32SHeiko Schocher Bus on the MPC8260. But it should be not so difficult 179167b23a32SHeiko Schocher to add this option to other architectures. 179267b23a32SHeiko Schocher 17932ac6985aSAndrew Dyer CONFIG_SOFT_I2C_READ_REPEATED_START 17942ac6985aSAndrew Dyer 17952ac6985aSAndrew Dyer defining this will force the i2c_read() function in 17962ac6985aSAndrew Dyer the soft_i2c driver to perform an I2C repeated start 17972ac6985aSAndrew Dyer between writing the address pointer and reading the 17982ac6985aSAndrew Dyer data. If this define is omitted the default behaviour 17992ac6985aSAndrew Dyer of doing a stop-start sequence will be used. Most I2C 18002ac6985aSAndrew Dyer devices can use either method, but some require one or 18012ac6985aSAndrew Dyer the other. 1802be5e6181STimur Tabi 1803c609719bSwdenk- SPI Support: CONFIG_SPI 1804c609719bSwdenk 1805c609719bSwdenk Enables SPI driver (so far only tested with 1806c609719bSwdenk SPI EEPROM, also an instance works with Crystal A/D and 1807c609719bSwdenk D/As on the SACSng board) 1808c609719bSwdenk 18096639562eSYoshihiro Shimoda CONFIG_SH_SPI 18106639562eSYoshihiro Shimoda 18116639562eSYoshihiro Shimoda Enables the driver for SPI controller on SuperH. Currently 18126639562eSYoshihiro Shimoda only SH7757 is supported. 18136639562eSYoshihiro Shimoda 1814c609719bSwdenk CONFIG_SPI_X 1815c609719bSwdenk 1816c609719bSwdenk Enables extended (16-bit) SPI EEPROM addressing. 1817c609719bSwdenk (symmetrical to CONFIG_I2C_X) 1818c609719bSwdenk 1819c609719bSwdenk CONFIG_SOFT_SPI 1820c609719bSwdenk 1821c609719bSwdenk Enables a software (bit-bang) SPI driver rather than 1822c609719bSwdenk using hardware support. This is a general purpose 1823c609719bSwdenk driver that only requires three general I/O port pins 1824c609719bSwdenk (two outputs, one input) to function. If this is 1825c609719bSwdenk defined, the board configuration must define several 1826c609719bSwdenk SPI configuration items (port pins to use, etc). For 1827c609719bSwdenk an example, see include/configs/sacsng.h. 1828c609719bSwdenk 182904a9e118SBen Warren CONFIG_HARD_SPI 183004a9e118SBen Warren 183104a9e118SBen Warren Enables a hardware SPI driver for general-purpose reads 183204a9e118SBen Warren and writes. As with CONFIG_SOFT_SPI, the board configuration 183304a9e118SBen Warren must define a list of chip-select function pointers. 183404a9e118SBen Warren Currently supported on some MPC8xxx processors. For an 183504a9e118SBen Warren example, see include/configs/mpc8349emds.h. 183604a9e118SBen Warren 183738254f45SGuennadi Liakhovetski CONFIG_MXC_SPI 183838254f45SGuennadi Liakhovetski 183938254f45SGuennadi Liakhovetski Enables the driver for the SPI controllers on i.MX and MXC 184038254f45SGuennadi Liakhovetski SoCs. Currently only i.MX31 is supported. 184138254f45SGuennadi Liakhovetski 18420133502eSMatthias Fuchs- FPGA Support: CONFIG_FPGA 18430133502eSMatthias Fuchs 18440133502eSMatthias Fuchs Enables FPGA subsystem. 18450133502eSMatthias Fuchs 18460133502eSMatthias Fuchs CONFIG_FPGA_<vendor> 18470133502eSMatthias Fuchs 18480133502eSMatthias Fuchs Enables support for specific chip vendors. 18490133502eSMatthias Fuchs (ALTERA, XILINX) 18500133502eSMatthias Fuchs 18510133502eSMatthias Fuchs CONFIG_FPGA_<family> 18520133502eSMatthias Fuchs 18530133502eSMatthias Fuchs Enables support for FPGA family. 18540133502eSMatthias Fuchs (SPARTAN2, SPARTAN3, VIRTEX2, CYCLONE2, ACEX1K, ACEX) 18550133502eSMatthias Fuchs 18560133502eSMatthias Fuchs CONFIG_FPGA_COUNT 1857c609719bSwdenk 1858c609719bSwdenk Specify the number of FPGA devices to support. 1859c609719bSwdenk 18606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_PROG_FEEDBACK 1861c609719bSwdenk 1862c609719bSwdenk Enable printing of hash marks during FPGA configuration. 1863c609719bSwdenk 18646d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_CHECK_BUSY 1865c609719bSwdenk 1866c609719bSwdenk Enable checks on FPGA configuration interface busy 1867c609719bSwdenk status by the configuration function. This option 1868c609719bSwdenk will require a board or device specific function to 1869c609719bSwdenk be written. 1870c609719bSwdenk 1871c609719bSwdenk CONFIG_FPGA_DELAY 1872c609719bSwdenk 1873c609719bSwdenk If defined, a function that provides delays in the FPGA 1874c609719bSwdenk configuration driver. 1875c609719bSwdenk 18766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_CHECK_CTRLC 1877c609719bSwdenk Allow Control-C to interrupt FPGA configuration 1878c609719bSwdenk 18796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_CHECK_ERROR 1880c609719bSwdenk 1881c609719bSwdenk Check for configuration errors during FPGA bitfile 1882c609719bSwdenk loading. For example, abort during Virtex II 1883c609719bSwdenk configuration if the INIT_B line goes low (which 1884c609719bSwdenk indicated a CRC error). 1885c609719bSwdenk 18866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_WAIT_INIT 1887c609719bSwdenk 1888c609719bSwdenk Maximum time to wait for the INIT_B line to deassert 1889c609719bSwdenk after PROB_B has been deasserted during a Virtex II 1890c609719bSwdenk FPGA configuration sequence. The default time is 500 189111ccc33fSMarcel Ziswiler ms. 1892c609719bSwdenk 18936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_WAIT_BUSY 1894c609719bSwdenk 1895c609719bSwdenk Maximum time to wait for BUSY to deassert during 189611ccc33fSMarcel Ziswiler Virtex II FPGA configuration. The default is 5 ms. 1897c609719bSwdenk 18986d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FPGA_WAIT_CONFIG 1899c609719bSwdenk 1900c609719bSwdenk Time to wait after FPGA configuration. The default is 190111ccc33fSMarcel Ziswiler 200 ms. 1902c609719bSwdenk 1903c609719bSwdenk- Configuration Management: 1904c609719bSwdenk CONFIG_IDENT_STRING 1905c609719bSwdenk 1906c609719bSwdenk If defined, this string will be added to the U-Boot 1907c609719bSwdenk version information (U_BOOT_VERSION) 1908c609719bSwdenk 1909c609719bSwdenk- Vendor Parameter Protection: 1910c609719bSwdenk 1911c609719bSwdenk U-Boot considers the values of the environment 1912c609719bSwdenk variables "serial#" (Board Serial Number) and 19137152b1d0Swdenk "ethaddr" (Ethernet Address) to be parameters that 1914c609719bSwdenk are set once by the board vendor / manufacturer, and 1915c609719bSwdenk protects these variables from casual modification by 1916c609719bSwdenk the user. Once set, these variables are read-only, 1917c609719bSwdenk and write or delete attempts are rejected. You can 191811ccc33fSMarcel Ziswiler change this behaviour: 1919c609719bSwdenk 1920c609719bSwdenk If CONFIG_ENV_OVERWRITE is #defined in your config 1921c609719bSwdenk file, the write protection for vendor parameters is 192247cd00faSwdenk completely disabled. Anybody can change or delete 1923c609719bSwdenk these parameters. 1924c609719bSwdenk 1925c609719bSwdenk Alternatively, if you #define _both_ CONFIG_ETHADDR 1926c609719bSwdenk _and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default 192711ccc33fSMarcel Ziswiler Ethernet address is installed in the environment, 1928c609719bSwdenk which can be changed exactly ONCE by the user. [The 1929c609719bSwdenk serial# is unaffected by this, i. e. it remains 1930c609719bSwdenk read-only.] 1931c609719bSwdenk 1932c609719bSwdenk- Protected RAM: 1933c609719bSwdenk CONFIG_PRAM 1934c609719bSwdenk 1935c609719bSwdenk Define this variable to enable the reservation of 1936c609719bSwdenk "protected RAM", i. e. RAM which is not overwritten 1937c609719bSwdenk by U-Boot. Define CONFIG_PRAM to hold the number of 1938c609719bSwdenk kB you want to reserve for pRAM. You can overwrite 1939c609719bSwdenk this default value by defining an environment 1940c609719bSwdenk variable "pram" to the number of kB you want to 1941c609719bSwdenk reserve. Note that the board info structure will 1942c609719bSwdenk still show the full amount of RAM. If pRAM is 1943c609719bSwdenk reserved, a new environment variable "mem" will 1944c609719bSwdenk automatically be defined to hold the amount of 1945c609719bSwdenk remaining RAM in a form that can be passed as boot 1946c609719bSwdenk argument to Linux, for instance like that: 1947c609719bSwdenk 1948fe126d8bSWolfgang Denk setenv bootargs ... mem=\${mem} 1949c609719bSwdenk saveenv 1950c609719bSwdenk 1951c609719bSwdenk This way you can tell Linux not to use this memory, 1952c609719bSwdenk either, which results in a memory region that will 1953c609719bSwdenk not be affected by reboots. 1954c609719bSwdenk 1955c609719bSwdenk *WARNING* If your board configuration uses automatic 1956c609719bSwdenk detection of the RAM size, you must make sure that 1957c609719bSwdenk this memory test is non-destructive. So far, the 1958c609719bSwdenk following board configurations are known to be 1959c609719bSwdenk "pRAM-clean": 1960c609719bSwdenk 1961c609719bSwdenk ETX094, IVMS8, IVML24, SPD8xx, TQM8xxL, 1962c609719bSwdenk HERMES, IP860, RPXlite, LWMON, LANTEC, 1963544d97e9SWolfgang Denk FLAGADM, TQM8260 1964c609719bSwdenk 1965c609719bSwdenk- Error Recovery: 1966c609719bSwdenk CONFIG_PANIC_HANG 1967c609719bSwdenk 1968c609719bSwdenk Define this variable to stop the system in case of a 1969c609719bSwdenk fatal error, so that you have to reset it manually. 1970c609719bSwdenk This is probably NOT a good idea for an embedded 197111ccc33fSMarcel Ziswiler system where you want the system to reboot 1972c609719bSwdenk automatically as fast as possible, but it may be 1973c609719bSwdenk useful during development since you can try to debug 1974c609719bSwdenk the conditions that lead to the situation. 1975c609719bSwdenk 1976c609719bSwdenk CONFIG_NET_RETRY_COUNT 1977c609719bSwdenk 1978c609719bSwdenk This variable defines the number of retries for 1979c609719bSwdenk network operations like ARP, RARP, TFTP, or BOOTP 1980c609719bSwdenk before giving up the operation. If not defined, a 1981c609719bSwdenk default value of 5 is used. 1982c609719bSwdenk 198340cb90eeSGuennadi Liakhovetski CONFIG_ARP_TIMEOUT 198440cb90eeSGuennadi Liakhovetski 198540cb90eeSGuennadi Liakhovetski Timeout waiting for an ARP reply in milliseconds. 198640cb90eeSGuennadi Liakhovetski 1987c609719bSwdenk- Command Interpreter: 19888078f1a5SWolfgang Denk CONFIG_AUTO_COMPLETE 198904a85b3bSwdenk 199004a85b3bSwdenk Enable auto completion of commands using TAB. 199104a85b3bSwdenk 19928078f1a5SWolfgang Denk Note that this feature has NOT been implemented yet 19938078f1a5SWolfgang Denk for the "hush" shell. 19948078f1a5SWolfgang Denk 19958078f1a5SWolfgang Denk 19966d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_HUSH_PARSER 1997c609719bSwdenk 1998c609719bSwdenk Define this variable to enable the "hush" shell (from 1999c609719bSwdenk Busybox) as command line interpreter, thus enabling 2000c609719bSwdenk powerful command line syntax like 2001c609719bSwdenk if...then...else...fi conditionals or `&&' and '||' 2002c609719bSwdenk constructs ("shell scripts"). 2003c609719bSwdenk 2004c609719bSwdenk If undefined, you get the old, much simpler behaviour 2005c609719bSwdenk with a somewhat smaller memory footprint. 2006c609719bSwdenk 2007c609719bSwdenk 20086d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PROMPT_HUSH_PS2 2009c609719bSwdenk 2010c609719bSwdenk This defines the secondary prompt string, which is 2011c609719bSwdenk printed when the command interpreter needs more input 2012c609719bSwdenk to complete a command. Usually "> ". 2013c609719bSwdenk 2014c609719bSwdenk Note: 2015c609719bSwdenk 2016c609719bSwdenk In the current implementation, the local variables 2017c609719bSwdenk space and global environment variables space are 2018c609719bSwdenk separated. Local variables are those you define by 20193b57fe0aSwdenk simply typing `name=value'. To access a local 2020c609719bSwdenk variable later on, you have write `$name' or 20213b57fe0aSwdenk `${name}'; to execute the contents of a variable 20223b57fe0aSwdenk directly type `$name' at the command prompt. 2023c609719bSwdenk 2024c609719bSwdenk Global environment variables are those you use 2025c609719bSwdenk setenv/printenv to work with. To run a command stored 2026c609719bSwdenk in such a variable, you need to use the run command, 2027c609719bSwdenk and you must not use the '$' sign to access them. 2028c609719bSwdenk 2029c609719bSwdenk To store commands and special characters in a 2030c609719bSwdenk variable, please use double quotation marks 2031c609719bSwdenk surrounding the whole text of the variable, instead 2032c609719bSwdenk of the backslashes before semicolons and special 2033c609719bSwdenk symbols. 2034c609719bSwdenk 2035aa0c71acSWolfgang Denk- Commandline Editing and History: 2036aa0c71acSWolfgang Denk CONFIG_CMDLINE_EDITING 2037aa0c71acSWolfgang Denk 203811ccc33fSMarcel Ziswiler Enable editing and History functions for interactive 2039aa0c71acSWolfgang Denk commandline input operations 2040aa0c71acSWolfgang Denk 2041a8c7c708Swdenk- Default Environment: 2042c609719bSwdenk CONFIG_EXTRA_ENV_SETTINGS 2043c609719bSwdenk 2044c609719bSwdenk Define this to contain any number of null terminated 2045c609719bSwdenk strings (variable = value pairs) that will be part of 20467152b1d0Swdenk the default environment compiled into the boot image. 20472262cfeeSwdenk 2048c609719bSwdenk For example, place something like this in your 2049c609719bSwdenk board's config file: 2050c609719bSwdenk 2051c609719bSwdenk #define CONFIG_EXTRA_ENV_SETTINGS \ 2052c609719bSwdenk "myvar1=value1\0" \ 2053c609719bSwdenk "myvar2=value2\0" 2054c609719bSwdenk 2055c609719bSwdenk Warning: This method is based on knowledge about the 2056c609719bSwdenk internal format how the environment is stored by the 20572262cfeeSwdenk U-Boot code. This is NOT an official, exported 2058c609719bSwdenk interface! Although it is unlikely that this format 20597152b1d0Swdenk will change soon, there is no guarantee either. 2060c609719bSwdenk You better know what you are doing here. 2061c609719bSwdenk 2062c609719bSwdenk Note: overly (ab)use of the default environment is 2063c609719bSwdenk discouraged. Make sure to check other ways to preset 206474de7aefSWolfgang Denk the environment like the "source" command or the 2065c609719bSwdenk boot command first. 2066c609719bSwdenk 2067a8c7c708Swdenk- DataFlash Support: 20682abbe075Swdenk CONFIG_HAS_DATAFLASH 20692abbe075Swdenk 20702abbe075Swdenk Defining this option enables DataFlash features and 20712abbe075Swdenk allows to read/write in Dataflash via the standard 20722abbe075Swdenk commands cp, md... 20732abbe075Swdenk 20743f85ce27Swdenk- SystemACE Support: 20753f85ce27Swdenk CONFIG_SYSTEMACE 20763f85ce27Swdenk 20773f85ce27Swdenk Adding this option adds support for Xilinx SystemACE 20783f85ce27Swdenk chips attached via some sort of local bus. The address 207911ccc33fSMarcel Ziswiler of the chip must also be defined in the 20806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_SYSTEMACE_BASE macro. For example: 20813f85ce27Swdenk 20823f85ce27Swdenk #define CONFIG_SYSTEMACE 20836d0f6bcfSJean-Christophe PLAGNIOL-VILLARD #define CONFIG_SYS_SYSTEMACE_BASE 0xf0000000 20843f85ce27Swdenk 20853f85ce27Swdenk When SystemACE support is added, the "ace" device type 20863f85ce27Swdenk becomes available to the fat commands, i.e. fatls. 20873f85ce27Swdenk 2088ecb0ccd9SWolfgang Denk- TFTP Fixed UDP Port: 2089ecb0ccd9SWolfgang Denk CONFIG_TFTP_PORT 2090ecb0ccd9SWolfgang Denk 209128cb9375SWolfgang Denk If this is defined, the environment variable tftpsrcp 2092ecb0ccd9SWolfgang Denk is used to supply the TFTP UDP source port value. 209328cb9375SWolfgang Denk If tftpsrcp isn't defined, the normal pseudo-random port 2094ecb0ccd9SWolfgang Denk number generator is used. 2095ecb0ccd9SWolfgang Denk 209628cb9375SWolfgang Denk Also, the environment variable tftpdstp is used to supply 209728cb9375SWolfgang Denk the TFTP UDP destination port value. If tftpdstp isn't 209828cb9375SWolfgang Denk defined, the normal port 69 is used. 209928cb9375SWolfgang Denk 210028cb9375SWolfgang Denk The purpose for tftpsrcp is to allow a TFTP server to 2101ecb0ccd9SWolfgang Denk blindly start the TFTP transfer using the pre-configured 2102ecb0ccd9SWolfgang Denk target IP address and UDP port. This has the effect of 2103ecb0ccd9SWolfgang Denk "punching through" the (Windows XP) firewall, allowing 2104ecb0ccd9SWolfgang Denk the remainder of the TFTP transfer to proceed normally. 2105ecb0ccd9SWolfgang Denk A better solution is to properly configure the firewall, 2106ecb0ccd9SWolfgang Denk but sometimes that is not allowed. 2107ecb0ccd9SWolfgang Denk 2108a8c7c708Swdenk- Show boot progress: 2109c609719bSwdenk CONFIG_SHOW_BOOT_PROGRESS 2110c609719bSwdenk 2111c609719bSwdenk Defining this option allows to add some board- 2112c609719bSwdenk specific code (calling a user-provided function 2113c609719bSwdenk "show_boot_progress(int)") that enables you to show 2114c609719bSwdenk the system's boot progress on some display (for 2115c609719bSwdenk example, some LED's) on your board. At the moment, 2116c609719bSwdenk the following checkpoints are implemented: 2117c609719bSwdenk 21181372cce2SMarian BalakowiczLegacy uImage format: 21191372cce2SMarian Balakowicz 2120c609719bSwdenk Arg Where When 2121c609719bSwdenk 1 common/cmd_bootm.c before attempting to boot an image 2122c609719bSwdenk -1 common/cmd_bootm.c Image header has bad magic number 2123c609719bSwdenk 2 common/cmd_bootm.c Image header has correct magic number 2124c609719bSwdenk -2 common/cmd_bootm.c Image header has bad checksum 2125c609719bSwdenk 3 common/cmd_bootm.c Image header has correct checksum 2126c609719bSwdenk -3 common/cmd_bootm.c Image data has bad checksum 2127c609719bSwdenk 4 common/cmd_bootm.c Image data has correct checksum 2128c609719bSwdenk -4 common/cmd_bootm.c Image is for unsupported architecture 2129c609719bSwdenk 5 common/cmd_bootm.c Architecture check OK 21301372cce2SMarian Balakowicz -5 common/cmd_bootm.c Wrong Image Type (not kernel, multi) 2131c609719bSwdenk 6 common/cmd_bootm.c Image Type check OK 2132c609719bSwdenk -6 common/cmd_bootm.c gunzip uncompression error 2133c609719bSwdenk -7 common/cmd_bootm.c Unimplemented compression type 2134c609719bSwdenk 7 common/cmd_bootm.c Uncompression OK 21351372cce2SMarian Balakowicz 8 common/cmd_bootm.c No uncompress/copy overwrite error 2136c609719bSwdenk -9 common/cmd_bootm.c Unsupported OS (not Linux, BSD, VxWorks, QNX) 21371372cce2SMarian Balakowicz 21381372cce2SMarian Balakowicz 9 common/image.c Start initial ramdisk verification 21391372cce2SMarian Balakowicz -10 common/image.c Ramdisk header has bad magic number 21401372cce2SMarian Balakowicz -11 common/image.c Ramdisk header has bad checksum 21411372cce2SMarian Balakowicz 10 common/image.c Ramdisk header is OK 21421372cce2SMarian Balakowicz -12 common/image.c Ramdisk data has bad checksum 21431372cce2SMarian Balakowicz 11 common/image.c Ramdisk data has correct checksum 21441372cce2SMarian Balakowicz 12 common/image.c Ramdisk verification complete, start loading 214511ccc33fSMarcel Ziswiler -13 common/image.c Wrong Image Type (not PPC Linux ramdisk) 21461372cce2SMarian Balakowicz 13 common/image.c Start multifile image verification 21471372cce2SMarian Balakowicz 14 common/image.c No initial ramdisk, no multifile, continue. 21481372cce2SMarian Balakowicz 2149ea0364f1SPeter Tyser 15 arch/<arch>/lib/bootm.c All preparation done, transferring control to OS 2150c609719bSwdenk 2151a47a12beSStefan Roese -30 arch/powerpc/lib/board.c Fatal error, hang the system 215263e73c9aSwdenk -31 post/post.c POST test failed, detected by post_output_backlog() 215363e73c9aSwdenk -32 post/post.c POST test failed, detected by post_run_single() 215463e73c9aSwdenk 2155566a494fSHeiko Schocher 34 common/cmd_doc.c before loading a Image from a DOC device 2156566a494fSHeiko Schocher -35 common/cmd_doc.c Bad usage of "doc" command 2157566a494fSHeiko Schocher 35 common/cmd_doc.c correct usage of "doc" command 2158566a494fSHeiko Schocher -36 common/cmd_doc.c No boot device 2159566a494fSHeiko Schocher 36 common/cmd_doc.c correct boot device 2160566a494fSHeiko Schocher -37 common/cmd_doc.c Unknown Chip ID on boot device 2161566a494fSHeiko Schocher 37 common/cmd_doc.c correct chip ID found, device available 2162566a494fSHeiko Schocher -38 common/cmd_doc.c Read Error on boot device 2163566a494fSHeiko Schocher 38 common/cmd_doc.c reading Image header from DOC device OK 2164566a494fSHeiko Schocher -39 common/cmd_doc.c Image header has bad magic number 2165566a494fSHeiko Schocher 39 common/cmd_doc.c Image header has correct magic number 2166566a494fSHeiko Schocher -40 common/cmd_doc.c Error reading Image from DOC device 2167566a494fSHeiko Schocher 40 common/cmd_doc.c Image header has correct magic number 2168566a494fSHeiko Schocher 41 common/cmd_ide.c before loading a Image from a IDE device 2169566a494fSHeiko Schocher -42 common/cmd_ide.c Bad usage of "ide" command 2170566a494fSHeiko Schocher 42 common/cmd_ide.c correct usage of "ide" command 2171566a494fSHeiko Schocher -43 common/cmd_ide.c No boot device 2172566a494fSHeiko Schocher 43 common/cmd_ide.c boot device found 2173566a494fSHeiko Schocher -44 common/cmd_ide.c Device not available 2174566a494fSHeiko Schocher 44 common/cmd_ide.c Device available 2175566a494fSHeiko Schocher -45 common/cmd_ide.c wrong partition selected 2176566a494fSHeiko Schocher 45 common/cmd_ide.c partition selected 2177566a494fSHeiko Schocher -46 common/cmd_ide.c Unknown partition table 2178566a494fSHeiko Schocher 46 common/cmd_ide.c valid partition table found 2179566a494fSHeiko Schocher -47 common/cmd_ide.c Invalid partition type 2180566a494fSHeiko Schocher 47 common/cmd_ide.c correct partition type 2181566a494fSHeiko Schocher -48 common/cmd_ide.c Error reading Image Header on boot device 2182566a494fSHeiko Schocher 48 common/cmd_ide.c reading Image Header from IDE device OK 2183566a494fSHeiko Schocher -49 common/cmd_ide.c Image header has bad magic number 2184566a494fSHeiko Schocher 49 common/cmd_ide.c Image header has correct magic number 2185566a494fSHeiko Schocher -50 common/cmd_ide.c Image header has bad checksum 2186566a494fSHeiko Schocher 50 common/cmd_ide.c Image header has correct checksum 2187566a494fSHeiko Schocher -51 common/cmd_ide.c Error reading Image from IDE device 2188566a494fSHeiko Schocher 51 common/cmd_ide.c reading Image from IDE device OK 2189566a494fSHeiko Schocher 52 common/cmd_nand.c before loading a Image from a NAND device 2190566a494fSHeiko Schocher -53 common/cmd_nand.c Bad usage of "nand" command 2191566a494fSHeiko Schocher 53 common/cmd_nand.c correct usage of "nand" command 2192566a494fSHeiko Schocher -54 common/cmd_nand.c No boot device 2193566a494fSHeiko Schocher 54 common/cmd_nand.c boot device found 2194566a494fSHeiko Schocher -55 common/cmd_nand.c Unknown Chip ID on boot device 2195566a494fSHeiko Schocher 55 common/cmd_nand.c correct chip ID found, device available 2196566a494fSHeiko Schocher -56 common/cmd_nand.c Error reading Image Header on boot device 2197566a494fSHeiko Schocher 56 common/cmd_nand.c reading Image Header from NAND device OK 2198566a494fSHeiko Schocher -57 common/cmd_nand.c Image header has bad magic number 2199566a494fSHeiko Schocher 57 common/cmd_nand.c Image header has correct magic number 2200566a494fSHeiko Schocher -58 common/cmd_nand.c Error reading Image from NAND device 2201566a494fSHeiko Schocher 58 common/cmd_nand.c reading Image from NAND device OK 2202c609719bSwdenk 2203566a494fSHeiko Schocher -60 common/env_common.c Environment has a bad CRC, using default 2204c609719bSwdenk 2205566a494fSHeiko Schocher 64 net/eth.c starting with Ethernet configuration. 2206566a494fSHeiko Schocher -64 net/eth.c no Ethernet found. 2207566a494fSHeiko Schocher 65 net/eth.c Ethernet found. 2208206c60cbSwdenk 2209566a494fSHeiko Schocher -80 common/cmd_net.c usage wrong 2210566a494fSHeiko Schocher 80 common/cmd_net.c before calling NetLoop() 221111ccc33fSMarcel Ziswiler -81 common/cmd_net.c some error in NetLoop() occurred 2212566a494fSHeiko Schocher 81 common/cmd_net.c NetLoop() back without error 2213566a494fSHeiko Schocher -82 common/cmd_net.c size == 0 (File with size 0 loaded) 2214566a494fSHeiko Schocher 82 common/cmd_net.c trying automatic boot 221574de7aefSWolfgang Denk 83 common/cmd_net.c running "source" command 221674de7aefSWolfgang Denk -83 common/cmd_net.c some error in automatic boot or "source" command 2217566a494fSHeiko Schocher 84 common/cmd_net.c end without errors 2218c609719bSwdenk 22191372cce2SMarian BalakowiczFIT uImage format: 22201372cce2SMarian Balakowicz 22211372cce2SMarian Balakowicz Arg Where When 22221372cce2SMarian Balakowicz 100 common/cmd_bootm.c Kernel FIT Image has correct format 22231372cce2SMarian Balakowicz -100 common/cmd_bootm.c Kernel FIT Image has incorrect format 22241372cce2SMarian Balakowicz 101 common/cmd_bootm.c No Kernel subimage unit name, using configuration 22251372cce2SMarian Balakowicz -101 common/cmd_bootm.c Can't get configuration for kernel subimage 22261372cce2SMarian Balakowicz 102 common/cmd_bootm.c Kernel unit name specified 22271372cce2SMarian Balakowicz -103 common/cmd_bootm.c Can't get kernel subimage node offset 2228f773bea8SMarian Balakowicz 103 common/cmd_bootm.c Found configuration node 22291372cce2SMarian Balakowicz 104 common/cmd_bootm.c Got kernel subimage node offset 22301372cce2SMarian Balakowicz -104 common/cmd_bootm.c Kernel subimage hash verification failed 22311372cce2SMarian Balakowicz 105 common/cmd_bootm.c Kernel subimage hash verification OK 22321372cce2SMarian Balakowicz -105 common/cmd_bootm.c Kernel subimage is for unsupported architecture 22331372cce2SMarian Balakowicz 106 common/cmd_bootm.c Architecture check OK 223411ccc33fSMarcel Ziswiler -106 common/cmd_bootm.c Kernel subimage has wrong type 223511ccc33fSMarcel Ziswiler 107 common/cmd_bootm.c Kernel subimage type OK 22361372cce2SMarian Balakowicz -107 common/cmd_bootm.c Can't get kernel subimage data/size 22371372cce2SMarian Balakowicz 108 common/cmd_bootm.c Got kernel subimage data/size 22381372cce2SMarian Balakowicz -108 common/cmd_bootm.c Wrong image type (not legacy, FIT) 22391372cce2SMarian Balakowicz -109 common/cmd_bootm.c Can't get kernel subimage type 22401372cce2SMarian Balakowicz -110 common/cmd_bootm.c Can't get kernel subimage comp 22411372cce2SMarian Balakowicz -111 common/cmd_bootm.c Can't get kernel subimage os 22421372cce2SMarian Balakowicz -112 common/cmd_bootm.c Can't get kernel subimage load address 22431372cce2SMarian Balakowicz -113 common/cmd_bootm.c Image uncompress/copy overwrite error 22441372cce2SMarian Balakowicz 22451372cce2SMarian Balakowicz 120 common/image.c Start initial ramdisk verification 22461372cce2SMarian Balakowicz -120 common/image.c Ramdisk FIT image has incorrect format 22471372cce2SMarian Balakowicz 121 common/image.c Ramdisk FIT image has correct format 224811ccc33fSMarcel Ziswiler 122 common/image.c No ramdisk subimage unit name, using configuration 22491372cce2SMarian Balakowicz -122 common/image.c Can't get configuration for ramdisk subimage 22501372cce2SMarian Balakowicz 123 common/image.c Ramdisk unit name specified 22511372cce2SMarian Balakowicz -124 common/image.c Can't get ramdisk subimage node offset 22521372cce2SMarian Balakowicz 125 common/image.c Got ramdisk subimage node offset 22531372cce2SMarian Balakowicz -125 common/image.c Ramdisk subimage hash verification failed 22541372cce2SMarian Balakowicz 126 common/image.c Ramdisk subimage hash verification OK 22551372cce2SMarian Balakowicz -126 common/image.c Ramdisk subimage for unsupported architecture 22561372cce2SMarian Balakowicz 127 common/image.c Architecture check OK 22571372cce2SMarian Balakowicz -127 common/image.c Can't get ramdisk subimage data/size 22581372cce2SMarian Balakowicz 128 common/image.c Got ramdisk subimage data/size 22591372cce2SMarian Balakowicz 129 common/image.c Can't get ramdisk load address 22601372cce2SMarian Balakowicz -129 common/image.c Got ramdisk load address 22611372cce2SMarian Balakowicz 226211ccc33fSMarcel Ziswiler -130 common/cmd_doc.c Incorrect FIT image format 22631372cce2SMarian Balakowicz 131 common/cmd_doc.c FIT image format OK 22641372cce2SMarian Balakowicz 226511ccc33fSMarcel Ziswiler -140 common/cmd_ide.c Incorrect FIT image format 22661372cce2SMarian Balakowicz 141 common/cmd_ide.c FIT image format OK 22671372cce2SMarian Balakowicz 226811ccc33fSMarcel Ziswiler -150 common/cmd_nand.c Incorrect FIT image format 22691372cce2SMarian Balakowicz 151 common/cmd_nand.c FIT image format OK 22701372cce2SMarian Balakowicz 22714cf2609bSWolfgang Denk- Standalone program support: 22724cf2609bSWolfgang Denk CONFIG_STANDALONE_LOAD_ADDR 22734cf2609bSWolfgang Denk 22746feff899SWolfgang Denk This option defines a board specific value for the 22756feff899SWolfgang Denk address where standalone program gets loaded, thus 22766feff899SWolfgang Denk overwriting the architecture dependent default 22774cf2609bSWolfgang Denk settings. 22784cf2609bSWolfgang Denk 22794cf2609bSWolfgang Denk- Frame Buffer Address: 22804cf2609bSWolfgang Denk CONFIG_FB_ADDR 22814cf2609bSWolfgang Denk 22824cf2609bSWolfgang Denk Define CONFIG_FB_ADDR if you want to use specific 22834cf2609bSWolfgang Denk address for frame buffer. 22844cf2609bSWolfgang Denk Then system will reserve the frame buffer address to 22854cf2609bSWolfgang Denk defined address instead of lcd_setmem (this function 22866feff899SWolfgang Denk grabs the memory for frame buffer by panel's size). 22874cf2609bSWolfgang Denk 22884cf2609bSWolfgang Denk Please see board_init_f function. 22894cf2609bSWolfgang Denk 2290cccfc2abSDetlev Zundel- Automatic software updates via TFTP server 2291cccfc2abSDetlev Zundel CONFIG_UPDATE_TFTP 2292cccfc2abSDetlev Zundel CONFIG_UPDATE_TFTP_CNT_MAX 2293cccfc2abSDetlev Zundel CONFIG_UPDATE_TFTP_MSEC_MAX 2294cccfc2abSDetlev Zundel 2295cccfc2abSDetlev Zundel These options enable and control the auto-update feature; 2296cccfc2abSDetlev Zundel for a more detailed description refer to doc/README.update. 2297cccfc2abSDetlev Zundel 2298cccfc2abSDetlev Zundel- MTD Support (mtdparts command, UBI support) 2299cccfc2abSDetlev Zundel CONFIG_MTD_DEVICE 2300cccfc2abSDetlev Zundel 2301cccfc2abSDetlev Zundel Adds the MTD device infrastructure from the Linux kernel. 2302cccfc2abSDetlev Zundel Needed for mtdparts command support. 2303cccfc2abSDetlev Zundel 2304cccfc2abSDetlev Zundel CONFIG_MTD_PARTITIONS 2305cccfc2abSDetlev Zundel 2306cccfc2abSDetlev Zundel Adds the MTD partitioning infrastructure from the Linux 2307cccfc2abSDetlev Zundel kernel. Needed for UBI support. 2308cccfc2abSDetlev Zundel 23096a11cf48SDaniel Schwierzeck- SPL framework 23106a11cf48SDaniel Schwierzeck CONFIG_SPL 23116a11cf48SDaniel Schwierzeck Enable building of SPL globally. 23126a11cf48SDaniel Schwierzeck 23136a11cf48SDaniel Schwierzeck CONFIG_SPL_TEXT_BASE 23146a11cf48SDaniel Schwierzeck TEXT_BASE for linking the SPL binary. 23156a11cf48SDaniel Schwierzeck 23166a11cf48SDaniel Schwierzeck CONFIG_SPL_LDSCRIPT 23176a11cf48SDaniel Schwierzeck LDSCRIPT for linking the SPL binary. 23186a11cf48SDaniel Schwierzeck 23196a11cf48SDaniel Schwierzeck CONFIG_SPL_LIBCOMMON_SUPPORT 23206a11cf48SDaniel Schwierzeck Support for common/libcommon.o in SPL binary 23216a11cf48SDaniel Schwierzeck 23226a11cf48SDaniel Schwierzeck CONFIG_SPL_LIBDISK_SUPPORT 23236a11cf48SDaniel Schwierzeck Support for disk/libdisk.o in SPL binary 23246a11cf48SDaniel Schwierzeck 23256a11cf48SDaniel Schwierzeck CONFIG_SPL_I2C_SUPPORT 23266a11cf48SDaniel Schwierzeck Support for drivers/i2c/libi2c.o in SPL binary 23276a11cf48SDaniel Schwierzeck 23286a11cf48SDaniel Schwierzeck CONFIG_SPL_GPIO_SUPPORT 23296a11cf48SDaniel Schwierzeck Support for drivers/gpio/libgpio.o in SPL binary 23306a11cf48SDaniel Schwierzeck 23316a11cf48SDaniel Schwierzeck CONFIG_SPL_MMC_SUPPORT 23326a11cf48SDaniel Schwierzeck Support for drivers/mmc/libmmc.o in SPL binary 23336a11cf48SDaniel Schwierzeck 23346a11cf48SDaniel Schwierzeck CONFIG_SPL_SERIAL_SUPPORT 23356a11cf48SDaniel Schwierzeck Support for drivers/serial/libserial.o in SPL binary 23366a11cf48SDaniel Schwierzeck 23376a11cf48SDaniel Schwierzeck CONFIG_SPL_SPI_FLASH_SUPPORT 23386a11cf48SDaniel Schwierzeck Support for drivers/mtd/spi/libspi_flash.o in SPL binary 23396a11cf48SDaniel Schwierzeck 23406a11cf48SDaniel Schwierzeck CONFIG_SPL_SPI_SUPPORT 23416a11cf48SDaniel Schwierzeck Support for drivers/spi/libspi.o in SPL binary 23426a11cf48SDaniel Schwierzeck 23436a11cf48SDaniel Schwierzeck CONFIG_SPL_FAT_SUPPORT 23446a11cf48SDaniel Schwierzeck Support for fs/fat/libfat.o in SPL binary 23456a11cf48SDaniel Schwierzeck 23466a11cf48SDaniel Schwierzeck CONFIG_SPL_LIBGENERIC_SUPPORT 23476a11cf48SDaniel Schwierzeck Support for lib/libgeneric.o in SPL binary 23481372cce2SMarian Balakowicz 2349c609719bSwdenkModem Support: 2350c609719bSwdenk-------------- 2351c609719bSwdenk 2352566e5cf4SWolfgang Denk[so far only for SMDK2400 boards] 2353c609719bSwdenk 235411ccc33fSMarcel Ziswiler- Modem support enable: 2355c609719bSwdenk CONFIG_MODEM_SUPPORT 2356c609719bSwdenk 2357c609719bSwdenk- RTS/CTS Flow control enable: 2358c609719bSwdenk CONFIG_HWFLOW 2359c609719bSwdenk 2360c609719bSwdenk- Modem debug support: 2361c609719bSwdenk CONFIG_MODEM_SUPPORT_DEBUG 2362c609719bSwdenk 2363c609719bSwdenk Enables debugging stuff (char screen[1024], dbg()) 2364c609719bSwdenk for modem support. Useful only with BDI2000. 2365c609719bSwdenk 2366a8c7c708Swdenk- Interrupt support (PPC): 2367a8c7c708Swdenk 2368a8c7c708Swdenk There are common interrupt_init() and timer_interrupt() 2369a8c7c708Swdenk for all PPC archs. interrupt_init() calls interrupt_init_cpu() 237011ccc33fSMarcel Ziswiler for CPU specific initialization. interrupt_init_cpu() 2371a8c7c708Swdenk should set decrementer_count to appropriate value. If 237211ccc33fSMarcel Ziswiler CPU resets decrementer automatically after interrupt 2373a8c7c708Swdenk (ppc4xx) it should set decrementer_count to zero. 237411ccc33fSMarcel Ziswiler timer_interrupt() calls timer_interrupt_cpu() for CPU 2375a8c7c708Swdenk specific handling. If board has watchdog / status_led 2376a8c7c708Swdenk / other_activity_monitor it works automatically from 2377a8c7c708Swdenk general timer_interrupt(). 2378a8c7c708Swdenk 2379c609719bSwdenk- General: 2380c609719bSwdenk 2381c609719bSwdenk In the target system modem support is enabled when a 2382c609719bSwdenk specific key (key combination) is pressed during 2383c609719bSwdenk power-on. Otherwise U-Boot will boot normally 238411ccc33fSMarcel Ziswiler (autoboot). The key_pressed() function is called from 2385c609719bSwdenk board_init(). Currently key_pressed() is a dummy 2386c609719bSwdenk function, returning 1 and thus enabling modem 2387c609719bSwdenk initialization. 2388c609719bSwdenk 2389c609719bSwdenk If there are no modem init strings in the 2390c609719bSwdenk environment, U-Boot proceed to autoboot; the 2391c609719bSwdenk previous output (banner, info printfs) will be 239211ccc33fSMarcel Ziswiler suppressed, though. 2393c609719bSwdenk 2394c609719bSwdenk See also: doc/README.Modem 2395c609719bSwdenk 2396c609719bSwdenk 2397c609719bSwdenkConfiguration Settings: 2398c609719bSwdenk----------------------- 2399c609719bSwdenk 24006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LONGHELP: Defined when you want long help messages included; 2401c609719bSwdenk undefine this when you're short of memory. 2402c609719bSwdenk 24032fb2604dSPeter Tyser- CONFIG_SYS_HELP_CMD_WIDTH: Defined when you want to override the default 24042fb2604dSPeter Tyser width of the commands listed in the 'help' command output. 24052fb2604dSPeter Tyser 24066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PROMPT: This is what U-Boot prints on the console to 2407c609719bSwdenk prompt for user input. 2408c609719bSwdenk 24096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CBSIZE: Buffer size for input from the Console 2410c609719bSwdenk 24116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PBSIZE: Buffer size for Console output 2412c609719bSwdenk 24136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAXARGS: max. Number of arguments accepted for monitor commands 2414c609719bSwdenk 24156d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BARGSIZE: Buffer size for Boot Arguments which are passed to 2416c609719bSwdenk the application (usually a Linux kernel) when it is 2417c609719bSwdenk booted 2418c609719bSwdenk 24196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BAUDRATE_TABLE: 2420c609719bSwdenk List of legal baudrate settings for this board. 2421c609719bSwdenk 24226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_INFO_QUIET 2423c609719bSwdenk Suppress display of console information at boot. 2424c609719bSwdenk 24256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_IS_IN_ENV 2426c609719bSwdenk If the board specific function 2427c609719bSwdenk extern int overwrite_console (void); 2428c609719bSwdenk returns 1, the stdin, stderr and stdout are switched to the 2429c609719bSwdenk serial port, else the settings in the environment are used. 2430c609719bSwdenk 24316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE 2432c609719bSwdenk Enable the call to overwrite_console(). 2433c609719bSwdenk 24346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CONSOLE_ENV_OVERWRITE 2435c609719bSwdenk Enable overwrite of previous console environment settings. 2436c609719bSwdenk 24376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END: 2438c609719bSwdenk Begin and End addresses of the area used by the 2439c609719bSwdenk simple memory test. 2440c609719bSwdenk 24416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_ALT_MEMTEST: 2442c609719bSwdenk Enable an alternate, more extensive memory test. 2443c609719bSwdenk 24446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEMTEST_SCRATCH: 24455f535fe1Swdenk Scratch address used by the alternate memory test 24465f535fe1Swdenk You only need to set this if address zero isn't writeable 24475f535fe1Swdenk 24486d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MEM_TOP_HIDE (PPC only): 24496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD If CONFIG_SYS_MEM_TOP_HIDE is defined in the board config header, 245014f73ca6SStefan Roese this specified memory area will get subtracted from the top 245111ccc33fSMarcel Ziswiler (end) of RAM and won't get "touched" at all by U-Boot. By 245214f73ca6SStefan Roese fixing up gd->ram_size the Linux kernel should gets passed 245314f73ca6SStefan Roese the now "corrected" memory size and won't touch it either. 245414f73ca6SStefan Roese This should work for arch/ppc and arch/powerpc. Only Linux 24555e12e75dSStefan Roese board ports in arch/powerpc with bootwrapper support that 245614f73ca6SStefan Roese recalculate the memory size from the SDRAM controller setup 24575e12e75dSStefan Roese will have to get fixed in Linux additionally. 245814f73ca6SStefan Roese 245914f73ca6SStefan Roese This option can be used as a workaround for the 440EPx/GRx 246014f73ca6SStefan Roese CHIP 11 errata where the last 256 bytes in SDRAM shouldn't 246114f73ca6SStefan Roese be touched. 246214f73ca6SStefan Roese 246314f73ca6SStefan Roese WARNING: Please make sure that this value is a multiple of 246414f73ca6SStefan Roese the Linux page size (normally 4k). If this is not the case, 246514f73ca6SStefan Roese then the end address of the Linux memory will be located at a 246614f73ca6SStefan Roese non page size aligned address and this could cause major 246714f73ca6SStefan Roese problems. 246814f73ca6SStefan Roese 24696d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TFTP_LOADADDR: 2470c609719bSwdenk Default load address for network file downloads 2471c609719bSwdenk 24726d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_LOADS_BAUD_CHANGE: 2473c609719bSwdenk Enable temporary baudrate change while serial download 2474c609719bSwdenk 24756d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SDRAM_BASE: 2476c609719bSwdenk Physical start address of SDRAM. _Must_ be 0 here. 2477c609719bSwdenk 24786d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MBIO_BASE: 2479c609719bSwdenk Physical start address of Motherboard I/O (if using a 2480c609719bSwdenk Cogent motherboard) 2481c609719bSwdenk 24826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_BASE: 2483c609719bSwdenk Physical start address of Flash memory. 2484c609719bSwdenk 24856d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_BASE: 2486c609719bSwdenk Physical start address of boot monitor code (set by 2487c609719bSwdenk make config files to be same as the text base address 248814d0a02aSWolfgang Denk (CONFIG_SYS_TEXT_BASE) used when linking) - same as 24896d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FLASH_BASE when booting from flash. 2490c609719bSwdenk 24916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MONITOR_LEN: 24923b57fe0aSwdenk Size of memory reserved for monitor code, used to 24933b57fe0aSwdenk determine _at_compile_time_ (!) if the environment is 24943b57fe0aSwdenk embedded within the U-Boot image, or in a separate 24953b57fe0aSwdenk flash sector. 2496c609719bSwdenk 24976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MALLOC_LEN: 2498c609719bSwdenk Size of DRAM reserved for malloc() use. 2499c609719bSwdenk 25006d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTM_LEN: 250115940c9aSStefan Roese Normally compressed uImages are limited to an 250215940c9aSStefan Roese uncompressed size of 8 MBytes. If this is not enough, 25036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD you can define CONFIG_SYS_BOOTM_LEN in your board config file 250415940c9aSStefan Roese to adjust this setting to your needs. 2505c609719bSwdenk 25066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_BOOTMAPSZ: 2507c609719bSwdenk Maximum size of memory mapped by the startup code of 2508c609719bSwdenk the Linux kernel; all data that must be processed by 25097d721e34SBartlomiej Sieka the Linux kernel (bd_info, boot arguments, FDT blob if 25107d721e34SBartlomiej Sieka used) must be put below this limit, unless "bootm_low" 25117d721e34SBartlomiej Sieka enviroment variable is defined and non-zero. In such case 25127d721e34SBartlomiej Sieka all data for the Linux kernel must be between "bootm_low" 2513c3624e6eSGrant Likely and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment 2514c3624e6eSGrant Likely variable "bootm_mapsize" will override the value of 2515c3624e6eSGrant Likely CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined, 2516c3624e6eSGrant Likely then the value in "bootm_size" will be used instead. 2517c609719bSwdenk 2518fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_RAMDISK_HIGH: 2519fca43cc8SJohn Rigby Enable initrd_high functionality. If defined then the 2520fca43cc8SJohn Rigby initrd_high feature is enabled and the bootm ramdisk subcommand 2521fca43cc8SJohn Rigby is enabled. 2522fca43cc8SJohn Rigby 2523fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_CMDLINE: 2524fca43cc8SJohn Rigby Enables allocating and saving kernel cmdline in space between 2525fca43cc8SJohn Rigby "bootm_low" and "bootm_low" + BOOTMAPSZ. 2526fca43cc8SJohn Rigby 2527fca43cc8SJohn Rigby- CONFIG_SYS_BOOT_GET_KBD: 2528fca43cc8SJohn Rigby Enables allocating and saving a kernel copy of the bd_info in 2529fca43cc8SJohn Rigby space between "bootm_low" and "bootm_low" + BOOTMAPSZ. 2530fca43cc8SJohn Rigby 25316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_BANKS: 2532c609719bSwdenk Max number of Flash memory banks 2533c609719bSwdenk 25346d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAX_FLASH_SECT: 2535c609719bSwdenk Max number of sectors on a Flash chip 2536c609719bSwdenk 25376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_ERASE_TOUT: 2538c609719bSwdenk Timeout for Flash erase operations (in ms) 2539c609719bSwdenk 25406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_WRITE_TOUT: 2541c609719bSwdenk Timeout for Flash write operations (in ms) 2542c609719bSwdenk 25436d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_LOCK_TOUT 25448564acf9Swdenk Timeout for Flash set sector lock bit operation (in ms) 25458564acf9Swdenk 25466d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_UNLOCK_TOUT 25478564acf9Swdenk Timeout for Flash clear lock bits operation (in ms) 25488564acf9Swdenk 25496d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_PROTECTION 25508564acf9Swdenk If defined, hardware flash sectors protection is used 25518564acf9Swdenk instead of U-Boot software protection. 25528564acf9Swdenk 25536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DIRECT_FLASH_TFTP: 2554c609719bSwdenk 2555c609719bSwdenk Enable TFTP transfers directly to flash memory; 2556c609719bSwdenk without this option such a download has to be 2557c609719bSwdenk performed in two steps: (1) download to RAM, and (2) 2558c609719bSwdenk copy from RAM to flash. 2559c609719bSwdenk 2560c609719bSwdenk The two-step approach is usually more reliable, since 2561c609719bSwdenk you can check if the download worked before you erase 256211ccc33fSMarcel Ziswiler the flash, but in some situations (when system RAM is 256311ccc33fSMarcel Ziswiler too limited to allow for a temporary copy of the 2564c609719bSwdenk downloaded image) this option may be very useful. 2565c609719bSwdenk 25666d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_CFI: 2567c609719bSwdenk Define if the flash driver uses extra elements in the 25685653fc33Swdenk common flash structure for storing flash geometry. 25695653fc33Swdenk 257000b1883aSJean-Christophe PLAGNIOL-VILLARD- CONFIG_FLASH_CFI_DRIVER 25715653fc33Swdenk This option also enables the building of the cfi_flash driver 25725653fc33Swdenk in the drivers directory 257353cf9435Sstroese 257491809ed5SPiotr Ziecik- CONFIG_FLASH_CFI_MTD 257591809ed5SPiotr Ziecik This option enables the building of the cfi_mtd driver 257691809ed5SPiotr Ziecik in the drivers directory. The driver exports CFI flash 257791809ed5SPiotr Ziecik to the MTD layer. 257891809ed5SPiotr Ziecik 25796d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_USE_BUFFER_WRITE 258096ef831fSGuennadi Liakhovetski Use buffered writes to flash. 258196ef831fSGuennadi Liakhovetski 258296ef831fSGuennadi Liakhovetski- CONFIG_FLASH_SPANSION_S29WS_N 258396ef831fSGuennadi Liakhovetski s29ws-n MirrorBit flash has non-standard addresses for buffered 258496ef831fSGuennadi Liakhovetski write commands. 258596ef831fSGuennadi Liakhovetski 25866d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FLASH_QUIET_TEST 25875568e613SStefan Roese If this option is defined, the common CFI flash doesn't 25885568e613SStefan Roese print it's warning upon not recognized FLASH banks. This 25895568e613SStefan Roese is useful, if some of the configured banks are only 25905568e613SStefan Roese optionally available. 25915568e613SStefan Roese 25929a042e9cSJerry Van Baren- CONFIG_FLASH_SHOW_PROGRESS 25939a042e9cSJerry Van Baren If defined (must be an integer), print out countdown 25949a042e9cSJerry Van Baren digits and dots. Recommended value: 45 (9..1) for 80 25959a042e9cSJerry Van Baren column displays, 15 (3..1) for 40 column displays. 25969a042e9cSJerry Van Baren 25976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_RX_ETH_BUFFER: 259811ccc33fSMarcel Ziswiler Defines the number of Ethernet receive buffers. On some 259911ccc33fSMarcel Ziswiler Ethernet controllers it is recommended to set this value 260053cf9435Sstroese to 8 or even higher (EEPRO100 or 405 EMAC), since all 260153cf9435Sstroese buffers can be full shortly after enabling the interface 260211ccc33fSMarcel Ziswiler on high Ethernet traffic. 260353cf9435Sstroese Defaults to 4 if not defined. 2604c609719bSwdenk 2605ea882bafSWolfgang Denk- CONFIG_ENV_MAX_ENTRIES 2606ea882bafSWolfgang Denk 2607ea882bafSWolfgang Denk Maximum number of entries in the hash table that is used 2608ea882bafSWolfgang Denk internally to store the environment settings. The default 2609ea882bafSWolfgang Denk setting is supposed to be generous and should work in most 2610ea882bafSWolfgang Denk cases. This setting can be used to tune behaviour; see 2611ea882bafSWolfgang Denk lib/hashtable.c for details. 2612ea882bafSWolfgang Denk 2613c609719bSwdenkThe following definitions that deal with the placement and management 2614c609719bSwdenkof environment data (variable area); in general, we support the 2615c609719bSwdenkfollowing configurations: 2616c609719bSwdenk 2617c3eb3fe4SMike Frysinger- CONFIG_BUILD_ENVCRC: 2618c3eb3fe4SMike Frysinger 2619c3eb3fe4SMike Frysinger Builds up envcrc with the target environment so that external utils 2620c3eb3fe4SMike Frysinger may easily extract it and embed it in final U-Boot images. 2621c3eb3fe4SMike Frysinger 26225a1aceb0SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_FLASH: 2623c609719bSwdenk 2624c609719bSwdenk Define this if the environment is in flash memory. 2625c609719bSwdenk 2626c609719bSwdenk a) The environment occupies one whole flash sector, which is 2627c609719bSwdenk "embedded" in the text segment with the U-Boot code. This 2628c609719bSwdenk happens usually with "bottom boot sector" or "top boot 2629c609719bSwdenk sector" type flash chips, which have several smaller 2630c609719bSwdenk sectors at the start or the end. For instance, such a 2631c609719bSwdenk layout can have sector sizes of 8, 2x4, 16, Nx32 kB. In 2632c609719bSwdenk such a case you would place the environment in one of the 2633c609719bSwdenk 4 kB sectors - with U-Boot code before and after it. With 2634c609719bSwdenk "top boot sector" type flash chips, you would put the 2635c609719bSwdenk environment in one of the last sectors, leaving a gap 2636c609719bSwdenk between U-Boot and the environment. 2637c609719bSwdenk 26380e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 2639c609719bSwdenk 2640c609719bSwdenk Offset of environment data (variable area) to the 2641c609719bSwdenk beginning of flash memory; for instance, with bottom boot 2642c609719bSwdenk type flash chips the second sector can be used: the offset 2643c609719bSwdenk for this sector is given here. 2644c609719bSwdenk 26456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_ENV_OFFSET is used relative to CONFIG_SYS_FLASH_BASE. 2646c609719bSwdenk 26470e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR: 2648c609719bSwdenk 2649c609719bSwdenk This is just another way to specify the start address of 2650c609719bSwdenk the flash sector containing the environment (instead of 26510e8d1586SJean-Christophe PLAGNIOL-VILLARD CONFIG_ENV_OFFSET). 2652c609719bSwdenk 26530e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SECT_SIZE: 2654c609719bSwdenk 2655c609719bSwdenk Size of the sector containing the environment. 2656c609719bSwdenk 2657c609719bSwdenk 2658c609719bSwdenk b) Sometimes flash chips have few, equal sized, BIG sectors. 2659c609719bSwdenk In such a case you don't want to spend a whole sector for 2660c609719bSwdenk the environment. 2661c609719bSwdenk 26620e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2663c609719bSwdenk 26645a1aceb0SJean-Christophe PLAGNIOL-VILLARD If you use this in combination with CONFIG_ENV_IS_IN_FLASH 26650e8d1586SJean-Christophe PLAGNIOL-VILLARD and CONFIG_ENV_SECT_SIZE, you can specify to use only a part 2666c609719bSwdenk of this flash sector for the environment. This saves 2667c609719bSwdenk memory for the RAM copy of the environment. 2668c609719bSwdenk 2669c609719bSwdenk It may also save flash memory if you decide to use this 2670c609719bSwdenk when your environment is "embedded" within U-Boot code, 2671c609719bSwdenk since then the remainder of the flash sector could be used 2672c609719bSwdenk for U-Boot code. It should be pointed out that this is 2673c609719bSwdenk STRONGLY DISCOURAGED from a robustness point of view: 2674c609719bSwdenk updating the environment in flash makes it always 2675c609719bSwdenk necessary to erase the WHOLE sector. If something goes 2676c609719bSwdenk wrong before the contents has been restored from a copy in 2677c609719bSwdenk RAM, your target system will be dead. 2678c609719bSwdenk 26790e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR_REDUND 26800e8d1586SJean-Christophe PLAGNIOL-VILLARD CONFIG_ENV_SIZE_REDUND 2681c609719bSwdenk 2682c609719bSwdenk These settings describe a second storage area used to hold 268311ccc33fSMarcel Ziswiler a redundant copy of the environment data, so that there is 26843e38691eSwdenk a valid backup copy in case there is a power failure during 2685c609719bSwdenk a "saveenv" operation. 2686c609719bSwdenk 2687c609719bSwdenkBE CAREFUL! Any changes to the flash layout, and some changes to the 2688c609719bSwdenksource code will make it necessary to adapt <board>/u-boot.lds* 2689c609719bSwdenkaccordingly! 2690c609719bSwdenk 2691c609719bSwdenk 26929314cee6SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NVRAM: 2693c609719bSwdenk 2694c609719bSwdenk Define this if you have some non-volatile memory device 2695c609719bSwdenk (NVRAM, battery buffered SRAM) which you want to use for the 2696c609719bSwdenk environment. 2697c609719bSwdenk 26980e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR: 26990e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2700c609719bSwdenk 270111ccc33fSMarcel Ziswiler These two #defines are used to determine the memory area you 2702c609719bSwdenk want to use for environment. It is assumed that this memory 2703c609719bSwdenk can just be read and written to, without any special 2704c609719bSwdenk provision. 2705c609719bSwdenk 2706c609719bSwdenkBE CAREFUL! The first access to the environment happens quite early 2707c609719bSwdenkin U-Boot initalization (when we try to get the setting of for the 270811ccc33fSMarcel Ziswilerconsole baudrate). You *MUST* have mapped your NVRAM area then, or 2709c609719bSwdenkU-Boot will hang. 2710c609719bSwdenk 2711c609719bSwdenkPlease note that even with NVRAM we still use a copy of the 2712c609719bSwdenkenvironment in RAM: we could work on NVRAM directly, but we want to 2713c609719bSwdenkkeep settings there always unmodified except somebody uses "saveenv" 2714c609719bSwdenkto save the current settings. 2715c609719bSwdenk 2716c609719bSwdenk 2717bb1f8b4fSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_EEPROM: 2718c609719bSwdenk 2719c609719bSwdenk Use this if you have an EEPROM or similar serial access 2720c609719bSwdenk device and a driver for it. 2721c609719bSwdenk 27220e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 27230e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 2724c609719bSwdenk 2725c609719bSwdenk These two #defines specify the offset and size of the 2726c609719bSwdenk environment area within the total memory of your EEPROM. 2727c609719bSwdenk 27286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_I2C_EEPROM_ADDR: 2729c609719bSwdenk If defined, specified the chip address of the EEPROM device. 2730c609719bSwdenk The default address is zero. 2731c609719bSwdenk 27326d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_EEPROM_PAGE_WRITE_BITS: 2733c609719bSwdenk If defined, the number of bits used to address bytes in a 2734c609719bSwdenk single page in the EEPROM device. A 64 byte page, for example 2735c609719bSwdenk would require six bits. 2736c609719bSwdenk 27376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS: 2738c609719bSwdenk If defined, the number of milliseconds to delay between 2739c609719bSwdenk page writes. The default is zero milliseconds. 2740c609719bSwdenk 27416d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_I2C_EEPROM_ADDR_LEN: 2742c609719bSwdenk The length in bytes of the EEPROM memory array address. Note 2743c609719bSwdenk that this is NOT the chip address length! 2744c609719bSwdenk 27456d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW: 27465cf91d6bSwdenk EEPROM chips that implement "address overflow" are ones 27475cf91d6bSwdenk like Catalyst 24WC04/08/16 which has 9/10/11 bits of 27485cf91d6bSwdenk address and the extra bits end up in the "chip address" bit 27495cf91d6bSwdenk slots. This makes a 24WC08 (1Kbyte) chip look like four 256 27505cf91d6bSwdenk byte chips. 27515cf91d6bSwdenk 27525cf91d6bSwdenk Note that we consider the length of the address field to 27535cf91d6bSwdenk still be one byte because the extra address bits are hidden 27545cf91d6bSwdenk in the chip address. 27555cf91d6bSwdenk 27566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD - CONFIG_SYS_EEPROM_SIZE: 2757c609719bSwdenk The size in bytes of the EEPROM device. 2758c609719bSwdenk 2759548738b4SHeiko Schocher - CONFIG_ENV_EEPROM_IS_ON_I2C 2760548738b4SHeiko Schocher define this, if you have I2C and SPI activated, and your 2761548738b4SHeiko Schocher EEPROM, which holds the environment, is on the I2C bus. 2762548738b4SHeiko Schocher 2763548738b4SHeiko Schocher - CONFIG_I2C_ENV_EEPROM_BUS 2764548738b4SHeiko Schocher if you have an Environment on an EEPROM reached over 2765548738b4SHeiko Schocher I2C muxes, you can define here, how to reach this 2766548738b4SHeiko Schocher EEPROM. For example: 2767548738b4SHeiko Schocher 2768548738b4SHeiko Schocher #define CONFIG_I2C_ENV_EEPROM_BUS "pca9547:70:d\0" 2769548738b4SHeiko Schocher 2770548738b4SHeiko Schocher EEPROM which holds the environment, is reached over 2771548738b4SHeiko Schocher a pca9547 i2c mux with address 0x70, channel 3. 2772c609719bSwdenk 2773057c849cSJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_DATAFLASH: 27745779d8d9Swdenk 27755779d8d9Swdenk Define this if you have a DataFlash memory device which you 27765779d8d9Swdenk want to use for the environment. 27775779d8d9Swdenk 27780e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 27790e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_ADDR: 27800e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 27815779d8d9Swdenk 27825779d8d9Swdenk These three #defines specify the offset and size of the 27835779d8d9Swdenk environment area within the total memory of your DataFlash placed 27845779d8d9Swdenk at the specified address. 27855779d8d9Swdenk 278651bfee19SJean-Christophe PLAGNIOL-VILLARD- CONFIG_ENV_IS_IN_NAND: 278713a5695bSwdenk 278813a5695bSwdenk Define this if you have a NAND device which you want to use 278913a5695bSwdenk for the environment. 279013a5695bSwdenk 27910e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_OFFSET: 27920e8d1586SJean-Christophe PLAGNIOL-VILLARD - CONFIG_ENV_SIZE: 279313a5695bSwdenk 279413a5695bSwdenk These two #defines specify the offset and size of the environment 2795fdd813deSScott Wood area within the first NAND device. CONFIG_ENV_OFFSET must be 2796fdd813deSScott Wood aligned to an erase block boundary. 27975779d8d9Swdenk 2798fdd813deSScott Wood - CONFIG_ENV_OFFSET_REDUND (optional): 2799e443c944SMarkus Klotzbuecher 28000e8d1586SJean-Christophe PLAGNIOL-VILLARD This setting describes a second storage area of CONFIG_ENV_SIZE 2801fdd813deSScott Wood size used to hold a redundant copy of the environment data, so 2802fdd813deSScott Wood that there is a valid backup copy in case there is a power failure 2803fdd813deSScott Wood during a "saveenv" operation. CONFIG_ENV_OFFSET_RENDUND must be 2804fdd813deSScott Wood aligned to an erase block boundary. 2805e443c944SMarkus Klotzbuecher 2806fdd813deSScott Wood - CONFIG_ENV_RANGE (optional): 2807fdd813deSScott Wood 2808fdd813deSScott Wood Specifies the length of the region in which the environment 2809fdd813deSScott Wood can be written. This should be a multiple of the NAND device's 2810fdd813deSScott Wood block size. Specifying a range with more erase blocks than 2811fdd813deSScott Wood are needed to hold CONFIG_ENV_SIZE allows bad blocks within 2812fdd813deSScott Wood the range to be avoided. 2813fdd813deSScott Wood 2814fdd813deSScott Wood - CONFIG_ENV_OFFSET_OOB (optional): 2815fdd813deSScott Wood 2816fdd813deSScott Wood Enables support for dynamically retrieving the offset of the 2817fdd813deSScott Wood environment from block zero's out-of-band data. The 2818fdd813deSScott Wood "nand env.oob" command can be used to record this offset. 2819fdd813deSScott Wood Currently, CONFIG_ENV_OFFSET_REDUND is not supported when 2820fdd813deSScott Wood using CONFIG_ENV_OFFSET_OOB. 2821e443c944SMarkus Klotzbuecher 2822b74ab737SGuennadi Liakhovetski- CONFIG_NAND_ENV_DST 2823b74ab737SGuennadi Liakhovetski 2824b74ab737SGuennadi Liakhovetski Defines address in RAM to which the nand_spl code should copy the 2825b74ab737SGuennadi Liakhovetski environment. If redundant environment is used, it will be copied to 2826b74ab737SGuennadi Liakhovetski CONFIG_NAND_ENV_DST + CONFIG_ENV_SIZE. 2827b74ab737SGuennadi Liakhovetski 28286d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_INIT_OFFSET 2829c609719bSwdenk 2830c609719bSwdenk Defines offset to the initial SPI buffer area in DPRAM. The 2831c609719bSwdenk area is used at an early stage (ROM part) if the environment 2832c609719bSwdenk is configured to reside in the SPI EEPROM: We need a 520 byte 2833c609719bSwdenk scratch DPRAM area. It is used between the two initialization 2834c609719bSwdenk calls (spi_init_f() and spi_init_r()). A value of 0xB00 seems 2835c609719bSwdenk to be a good choice since it makes it far enough from the 2836c609719bSwdenk start of the data area as well as from the stack pointer. 2837c609719bSwdenk 2838e881cb56SBruce AdlerPlease note that the environment is read-only until the monitor 2839c609719bSwdenkhas been relocated to RAM and a RAM copy of the environment has been 2840cdb74977SWolfgang Denkcreated; also, when using EEPROM you will have to use getenv_f() 2841c609719bSwdenkuntil then to read environment variables. 2842c609719bSwdenk 284385ec0bccSwdenkThe environment is protected by a CRC32 checksum. Before the monitor 284485ec0bccSwdenkis relocated into RAM, as a result of a bad CRC you will be working 284585ec0bccSwdenkwith the compiled-in default environment - *silently*!!! [This is 284685ec0bccSwdenknecessary, because the first environment variable we need is the 284785ec0bccSwdenk"baudrate" setting for the console - if we have a bad CRC, we don't 284885ec0bccSwdenkhave any device yet where we could complain.] 2849c609719bSwdenk 2850c609719bSwdenkNote: once the monitor has been relocated, then it will complain if 2851c609719bSwdenkthe default environment is used; a new CRC is computed as soon as you 285285ec0bccSwdenkuse the "saveenv" command to store a valid environment. 2853c609719bSwdenk 28546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_ECHO_LINK_DOWN: 2855fc3e2165Swdenk Echo the inverted Ethernet link state to the fault LED. 2856fc3e2165Swdenk 28576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD Note: If this option is active, then CONFIG_SYS_FAULT_MII_ADDR 2858fc3e2165Swdenk also needs to be defined. 2859fc3e2165Swdenk 28606d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_FAULT_MII_ADDR: 2861fc3e2165Swdenk MII address of the PHY to check for the Ethernet link state. 2862c609719bSwdenk 2863f5675aa5SRon Madrid- CONFIG_NS16550_MIN_FUNCTIONS: 2864f5675aa5SRon Madrid Define this if you desire to only have use of the NS16550_init 2865f5675aa5SRon Madrid and NS16550_putc functions for the serial driver located at 2866f5675aa5SRon Madrid drivers/serial/ns16550.c. This option is useful for saving 2867f5675aa5SRon Madrid space for already greatly restricted images, including but not 2868f5675aa5SRon Madrid limited to NAND_SPL configurations. 2869f5675aa5SRon Madrid 2870c609719bSwdenkLow Level (hardware related) configuration options: 2871dc7c9a1aSwdenk--------------------------------------------------- 2872c609719bSwdenk 28736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CACHELINE_SIZE: 2874c609719bSwdenk Cache Line Size of the CPU. 2875c609719bSwdenk 28766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DEFAULT_IMMR: 2877c609719bSwdenk Default address of the IMMR after system reset. 28782535d602Swdenk 28792535d602Swdenk Needed on some 8260 systems (MPC8260ADS, PQ2FADS-ZU, 28802535d602Swdenk and RPXsuper) to be able to adjust the position of 28812535d602Swdenk the IMMR register after a reset. 2882c609719bSwdenk 2883e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_DEFAULT: 2884e46fedfeSTimur Tabi Default (power-on reset) physical address of CCSR on Freescale 2885e46fedfeSTimur Tabi PowerPC SOCs. 2886e46fedfeSTimur Tabi 2887e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR: 2888e46fedfeSTimur Tabi Virtual address of CCSR. On a 32-bit build, this is typically 2889e46fedfeSTimur Tabi the same value as CONFIG_SYS_CCSRBAR_DEFAULT. 2890e46fedfeSTimur Tabi 2891e46fedfeSTimur Tabi CONFIG_SYS_DEFAULT_IMMR must also be set to this value, 2892e46fedfeSTimur Tabi for cross-platform code that uses that macro instead. 2893e46fedfeSTimur Tabi 2894e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS: 2895e46fedfeSTimur Tabi Physical address of CCSR. CCSR can be relocated to a new 2896e46fedfeSTimur Tabi physical address, if desired. In this case, this macro should 2897e46fedfeSTimur Tabi be set to that address. Otherwise, it should be set to the 2898e46fedfeSTimur Tabi same value as CONFIG_SYS_CCSRBAR_DEFAULT. For example, CCSR 2899e46fedfeSTimur Tabi is typically relocated on 36-bit builds. It is recommended 2900e46fedfeSTimur Tabi that this macro be defined via the _HIGH and _LOW macros: 2901e46fedfeSTimur Tabi 2902e46fedfeSTimur Tabi #define CONFIG_SYS_CCSRBAR_PHYS ((CONFIG_SYS_CCSRBAR_PHYS_HIGH 2903e46fedfeSTimur Tabi * 1ull) << 32 | CONFIG_SYS_CCSRBAR_PHYS_LOW) 2904e46fedfeSTimur Tabi 2905e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_HIGH: 2906e46fedfeSTimur Tabi Bits 33-36 of CONFIG_SYS_CCSRBAR_PHYS. This value is typically 2907e46fedfeSTimur Tabi either 0 (32-bit build) or 0xF (36-bit build). This macro is 2908e46fedfeSTimur Tabi used in assembly code, so it must not contain typecasts or 2909e46fedfeSTimur Tabi integer size suffixes (e.g. "ULL"). 2910e46fedfeSTimur Tabi 2911e46fedfeSTimur Tabi- CONFIG_SYS_CCSRBAR_PHYS_LOW: 2912e46fedfeSTimur Tabi Lower 32-bits of CONFIG_SYS_CCSRBAR_PHYS. This macro is 2913e46fedfeSTimur Tabi used in assembly code, so it must not contain typecasts or 2914e46fedfeSTimur Tabi integer size suffixes (e.g. "ULL"). 2915e46fedfeSTimur Tabi 2916e46fedfeSTimur Tabi- CONFIG_SYS_CCSR_DO_NOT_RELOCATE: 2917e46fedfeSTimur Tabi If this macro is defined, then CONFIG_SYS_CCSRBAR_PHYS will be 2918e46fedfeSTimur Tabi forced to a value that ensures that CCSR is not relocated. 2919e46fedfeSTimur Tabi 29207f6c2cbcSwdenk- Floppy Disk Support: 29216d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FDC_DRIVE_NUMBER 29227f6c2cbcSwdenk 29237f6c2cbcSwdenk the default drive number (default value 0) 29247f6c2cbcSwdenk 29256d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_ISA_IO_STRIDE 29267f6c2cbcSwdenk 292711ccc33fSMarcel Ziswiler defines the spacing between FDC chipset registers 29287f6c2cbcSwdenk (default value 1) 29297f6c2cbcSwdenk 29306d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_ISA_IO_OFFSET 29317f6c2cbcSwdenk 29327f6c2cbcSwdenk defines the offset of register from address. It 29337f6c2cbcSwdenk depends on which part of the data bus is connected to 293411ccc33fSMarcel Ziswiler the FDC chipset. (default value 0) 29357f6c2cbcSwdenk 29366d0f6bcfSJean-Christophe PLAGNIOL-VILLARD If CONFIG_SYS_ISA_IO_STRIDE CONFIG_SYS_ISA_IO_OFFSET and 29376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_FDC_DRIVE_NUMBER are undefined, they take their 29387f6c2cbcSwdenk default value. 29397f6c2cbcSwdenk 29406d0f6bcfSJean-Christophe PLAGNIOL-VILLARD if CONFIG_SYS_FDC_HW_INIT is defined, then the function 29417f6c2cbcSwdenk fdc_hw_init() is called at the beginning of the FDC 29427f6c2cbcSwdenk setup. fdc_hw_init() must be provided by the board 29437f6c2cbcSwdenk source code. It is used to make hardware dependant 29447f6c2cbcSwdenk initializations. 29457f6c2cbcSwdenk 29460abddf82SMacpaul Lin- CONFIG_IDE_AHB: 29470abddf82SMacpaul Lin Most IDE controllers were designed to be connected with PCI 29480abddf82SMacpaul Lin interface. Only few of them were designed for AHB interface. 29490abddf82SMacpaul Lin When software is doing ATA command and data transfer to 29500abddf82SMacpaul Lin IDE devices through IDE-AHB controller, some additional 29510abddf82SMacpaul Lin registers accessing to these kind of IDE-AHB controller 29520abddf82SMacpaul Lin is requierd. 29530abddf82SMacpaul Lin 29546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_IMMR: Physical address of the Internal Memory. 295525d6712aSwdenk DO NOT CHANGE unless you know exactly what you're 295625d6712aSwdenk doing! (11-4) [MPC8xx/82xx systems only] 2957c609719bSwdenk 29586d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_INIT_RAM_ADDR: 2959c609719bSwdenk 29607152b1d0Swdenk Start address of memory area that can be used for 2961c609719bSwdenk initial data and stack; please note that this must be 2962c609719bSwdenk writable memory that is working WITHOUT special 2963c609719bSwdenk initialization, i. e. you CANNOT use normal RAM which 2964c609719bSwdenk will become available only after programming the 2965c609719bSwdenk memory controller and running certain initialization 2966c609719bSwdenk sequences. 2967c609719bSwdenk 2968c609719bSwdenk U-Boot uses the following memory types: 2969c609719bSwdenk - MPC8xx and MPC8260: IMMR (internal memory of the CPU) 2970c609719bSwdenk - MPC824X: data cache 2971c609719bSwdenk - PPC4xx: data cache 2972c609719bSwdenk 29736d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_GBL_DATA_OFFSET: 2974c609719bSwdenk 2975c609719bSwdenk Offset of the initial data structure in the memory 29766d0f6bcfSJean-Christophe PLAGNIOL-VILLARD area defined by CONFIG_SYS_INIT_RAM_ADDR. Usually 29776d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_GBL_DATA_OFFSET is chosen such that the initial 2978c609719bSwdenk data is located at the end of the available space 2979553f0982SWolfgang Denk (sometimes written as (CONFIG_SYS_INIT_RAM_SIZE - 29806d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_INIT_DATA_SIZE), and the initial stack is just 29816d0f6bcfSJean-Christophe PLAGNIOL-VILLARD below that area (growing from (CONFIG_SYS_INIT_RAM_ADDR + 29826d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_GBL_DATA_OFFSET) downward. 2983c609719bSwdenk 2984c609719bSwdenk Note: 2985c609719bSwdenk On the MPC824X (or other systems that use the data 2986c609719bSwdenk cache for initial memory) the address chosen for 29876d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_INIT_RAM_ADDR is basically arbitrary - it must 2988c609719bSwdenk point to an otherwise UNUSED address space between 2989c609719bSwdenk the top of RAM and the start of the PCI space. 2990c609719bSwdenk 29916d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SIUMCR: SIU Module Configuration (11-6) 2992c609719bSwdenk 29936d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SYPCR: System Protection Control (11-9) 2994c609719bSwdenk 29956d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_TBSCR: Time Base Status and Control (11-26) 2996c609719bSwdenk 29976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PISCR: Periodic Interrupt Status and Control (11-31) 2998c609719bSwdenk 29996d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PLPRCR: PLL, Low-Power, and Reset Control Register (15-30) 3000c609719bSwdenk 30016d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SCCR: System Clock and reset Control Register (15-27) 3002c609719bSwdenk 30036d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_OR_TIMING_SDRAM: 3004c609719bSwdenk SDRAM timing 3005c609719bSwdenk 30066d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA: 3007c609719bSwdenk periodic timer for refresh 3008c609719bSwdenk 30096d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_DER: Debug Event Register (37-47) 3010c609719bSwdenk 30116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- FLASH_BASE0_PRELIM, FLASH_BASE1_PRELIM, CONFIG_SYS_REMAP_OR_AM, 30126d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PRELIM_OR_AM, CONFIG_SYS_OR_TIMING_FLASH, CONFIG_SYS_OR0_REMAP, 30136d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_OR0_PRELIM, CONFIG_SYS_BR0_PRELIM, CONFIG_SYS_OR1_REMAP, CONFIG_SYS_OR1_PRELIM, 30146d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BR1_PRELIM: 3015c609719bSwdenk Memory Controller Definitions: BR0/1 and OR0/1 (FLASH) 3016c609719bSwdenk 3017c609719bSwdenk- SDRAM_BASE2_PRELIM, SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE, 30186d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_OR_TIMING_SDRAM, CONFIG_SYS_OR2_PRELIM, CONFIG_SYS_BR2_PRELIM, 30196d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM: 3020c609719bSwdenk Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM) 3021c609719bSwdenk 30226d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_MAMR_PTA, CONFIG_SYS_MPTPR_2BK_4K, CONFIG_SYS_MPTPR_1BK_4K, CONFIG_SYS_MPTPR_2BK_8K, 30236d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_MPTPR_1BK_8K, CONFIG_SYS_MAMR_8COL, CONFIG_SYS_MAMR_9COL: 3024c609719bSwdenk Machine Mode Register and Memory Periodic Timer 3025c609719bSwdenk Prescaler definitions (SDRAM timing) 3026c609719bSwdenk 30276d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_I2C_UCODE_PATCH, CONFIG_SYS_I2C_DPMEM_OFFSET [0x1FC0]: 3028c609719bSwdenk enable I2C microcode relocation patch (MPC8xx); 3029c609719bSwdenk define relocation offset in DPRAM [DSP2] 3030c609719bSwdenk 30316d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SMC_UCODE_PATCH, CONFIG_SYS_SMC_DPMEM_OFFSET [0x1FC0]: 3032b423d055SHeiko Schocher enable SMC microcode relocation patch (MPC8xx); 3033b423d055SHeiko Schocher define relocation offset in DPRAM [SMC1] 3034b423d055SHeiko Schocher 30356d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPI_UCODE_PATCH, CONFIG_SYS_SPI_DPMEM_OFFSET [0x1FC0]: 3036c609719bSwdenk enable SPI microcode relocation patch (MPC8xx); 3037c609719bSwdenk define relocation offset in DPRAM [SCC4] 3038c609719bSwdenk 30396d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_USE_OSCCLK: 3040c609719bSwdenk Use OSCM clock mode on MBX8xx board. Be careful, 3041c609719bSwdenk wrong setting might damage your board. Read 3042c609719bSwdenk doc/README.MBX before setting this variable! 3043c609719bSwdenk 30446d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_CPM_POST_WORD_ADDR: (MPC8xx, MPC8260 only) 3045ea909b76Swdenk Offset of the bootmode word in DPRAM used by post 3046ea909b76Swdenk (Power On Self Tests). This definition overrides 3047ea909b76Swdenk #define'd default value in commproc.h resp. 3048ea909b76Swdenk cpm_8260.h. 3049ea909b76Swdenk 30506d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_PCI_SLV_MEM_LOCAL, CONFIG_SYS_PCI_SLV_MEM_BUS, CONFIG_SYS_PICMR0_MASK_ATTRIB, 30516d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR0_LOCAL, CONFIG_SYS_PCIMSK0_MASK, CONFIG_SYS_PCI_MSTR1_LOCAL, 30526d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCIMSK1_MASK, CONFIG_SYS_PCI_MSTR_MEM_LOCAL, CONFIG_SYS_PCI_MSTR_MEM_BUS, 30536d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_CPU_PCI_MEM_START, CONFIG_SYS_PCI_MSTR_MEM_SIZE, CONFIG_SYS_POCMR0_MASK_ATTRIB, 30546d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR_MEMIO_LOCAL, CONFIG_SYS_PCI_MSTR_MEMIO_BUS, CPU_PCI_MEMIO_START, 30556d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR_MEMIO_SIZE, CONFIG_SYS_POCMR1_MASK_ATTRIB, CONFIG_SYS_PCI_MSTR_IO_LOCAL, 30566d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_PCI_MSTR_IO_BUS, CONFIG_SYS_CPU_PCI_IO_START, CONFIG_SYS_PCI_MSTR_IO_SIZE, 30576d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_POCMR2_MASK_ATTRIB: (MPC826x only) 3058a47a12beSStefan Roese Overrides the default PCI memory map in arch/powerpc/cpu/mpc8260/pci.c if set. 30595d232d0eSwdenk 30609cacf4fcSDirk Eibach- CONFIG_PCI_DISABLE_PCIE: 30619cacf4fcSDirk Eibach Disable PCI-Express on systems where it is supported but not 30629cacf4fcSDirk Eibach required. 30639cacf4fcSDirk Eibach 3064a09b9b68SKumar Gala- CONFIG_SYS_SRIO: 3065a09b9b68SKumar Gala Chip has SRIO or not 3066a09b9b68SKumar Gala 3067a09b9b68SKumar Gala- CONFIG_SRIO1: 3068a09b9b68SKumar Gala Board has SRIO 1 port available 3069a09b9b68SKumar Gala 3070a09b9b68SKumar Gala- CONFIG_SRIO2: 3071a09b9b68SKumar Gala Board has SRIO 2 port available 3072a09b9b68SKumar Gala 3073a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_VIRT: 3074a09b9b68SKumar Gala Virtual Address of SRIO port 'n' memory region 3075a09b9b68SKumar Gala 3076a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_PHYS: 3077a09b9b68SKumar Gala Physical Address of SRIO port 'n' memory region 3078a09b9b68SKumar Gala 3079a09b9b68SKumar Gala- CONFIG_SYS_SRIOn_MEM_SIZE: 3080a09b9b68SKumar Gala Size of SRIO port 'n' memory region 3081a09b9b68SKumar Gala 3082eced4626SAlex Waterman- CONFIG_SYS_NDFC_16 3083eced4626SAlex Waterman Defined to tell the NDFC that the NAND chip is using a 3084eced4626SAlex Waterman 16 bit bus. 3085eced4626SAlex Waterman 3086eced4626SAlex Waterman- CONFIG_SYS_NDFC_EBC0_CFG 3087eced4626SAlex Waterman Sets the EBC0_CFG register for the NDFC. If not defined 3088eced4626SAlex Waterman a default value will be used. 3089eced4626SAlex Waterman 3090bb99ad6dSBen Warren- CONFIG_SPD_EEPROM 3091218ca724SWolfgang Denk Get DDR timing information from an I2C EEPROM. Common 3092218ca724SWolfgang Denk with pluggable memory modules such as SODIMMs 3093218ca724SWolfgang Denk 3094bb99ad6dSBen Warren SPD_EEPROM_ADDRESS 3095bb99ad6dSBen Warren I2C address of the SPD EEPROM 3096bb99ad6dSBen Warren 30976d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_SPD_BUS_NUM 3098218ca724SWolfgang Denk If SPD EEPROM is on an I2C bus other than the first 3099218ca724SWolfgang Denk one, specify here. Note that the value must resolve 3100218ca724SWolfgang Denk to something your driver can deal with. 3101bb99ad6dSBen Warren 31021b3e3c4fSYork Sun- CONFIG_SYS_DDR_RAW_TIMING 31031b3e3c4fSYork Sun Get DDR timing information from other than SPD. Common with 31041b3e3c4fSYork Sun soldered DDR chips onboard without SPD. DDR raw timing 31051b3e3c4fSYork Sun parameters are extracted from datasheet and hard-coded into 31061b3e3c4fSYork Sun header files or board specific files. 31071b3e3c4fSYork Sun 31086f5e1dc5SYork Sun- CONFIG_FSL_DDR_INTERACTIVE 31096f5e1dc5SYork Sun Enable interactive DDR debugging. See doc/README.fsl-ddr. 31106f5e1dc5SYork Sun 31116d0f6bcfSJean-Christophe PLAGNIOL-VILLARD- CONFIG_SYS_83XX_DDR_USES_CS0 3112218ca724SWolfgang Denk Only for 83xx systems. If specified, then DDR should 3113218ca724SWolfgang Denk be configured using CS0 and CS1 instead of CS2 and CS3. 31142ad6b513STimur Tabi 3115c26e454dSwdenk- CONFIG_ETHER_ON_FEC[12] 3116c26e454dSwdenk Define to enable FEC[12] on a 8xx series processor. 3117c26e454dSwdenk 3118c26e454dSwdenk- CONFIG_FEC[12]_PHY 3119c26e454dSwdenk Define to the hardcoded PHY address which corresponds 31206e592385Swdenk to the given FEC; i. e. 3121c26e454dSwdenk #define CONFIG_FEC1_PHY 4 3122c26e454dSwdenk means that the PHY with address 4 is connected to FEC1 3123c26e454dSwdenk 3124c26e454dSwdenk When set to -1, means to probe for first available. 3125c26e454dSwdenk 3126c26e454dSwdenk- CONFIG_FEC[12]_PHY_NORXERR 3127c26e454dSwdenk The PHY does not have a RXERR line (RMII only). 3128c26e454dSwdenk (so program the FEC to ignore it). 3129c26e454dSwdenk 3130c26e454dSwdenk- CONFIG_RMII 3131c26e454dSwdenk Enable RMII mode for all FECs. 3132c26e454dSwdenk Note that this is a global option, we can't 3133c26e454dSwdenk have one FEC in standard MII mode and another in RMII mode. 3134c26e454dSwdenk 31355cf91d6bSwdenk- CONFIG_CRC32_VERIFY 31365cf91d6bSwdenk Add a verify option to the crc32 command. 31375cf91d6bSwdenk The syntax is: 31385cf91d6bSwdenk 31395cf91d6bSwdenk => crc32 -v <address> <count> <crc32> 31405cf91d6bSwdenk 31415cf91d6bSwdenk Where address/count indicate a memory area 31425cf91d6bSwdenk and crc32 is the correct crc32 which the 31435cf91d6bSwdenk area should have. 31445cf91d6bSwdenk 314556523f12Swdenk- CONFIG_LOOPW 314656523f12Swdenk Add the "loopw" memory command. This only takes effect if 3147602ad3b3SJon Loeliger the memory commands are activated globally (CONFIG_CMD_MEM). 314856523f12Swdenk 31497b466641Sstroese- CONFIG_MX_CYCLIC 31507b466641Sstroese Add the "mdc" and "mwc" memory commands. These are cyclic 31517b466641Sstroese "md/mw" commands. 31527b466641Sstroese Examples: 31537b466641Sstroese 31547b466641Sstroese => mdc.b 10 4 500 31557b466641Sstroese This command will print 4 bytes (10,11,12,13) each 500 ms. 31567b466641Sstroese 31577b466641Sstroese => mwc.l 100 12345678 10 31587b466641Sstroese This command will write 12345678 to address 100 all 10 ms. 31597b466641Sstroese 31607b466641Sstroese This only takes effect if the memory commands are activated 3161602ad3b3SJon Loeliger globally (CONFIG_CMD_MEM). 31627b466641Sstroese 31638aa1a2d1Swdenk- CONFIG_SKIP_LOWLEVEL_INIT 3164afc1ce82SMacpaul Lin [ARM, NDS32, MIPS only] If this variable is defined, then certain 3165e03f3169SWolfgang Denk low level initializations (like setting up the memory 3166e03f3169SWolfgang Denk controller) are omitted and/or U-Boot does not 3167e03f3169SWolfgang Denk relocate itself into RAM. 31688aa1a2d1Swdenk 3169e03f3169SWolfgang Denk Normally this variable MUST NOT be defined. The only 3170e03f3169SWolfgang Denk exception is when U-Boot is loaded (to RAM) by some 3171e03f3169SWolfgang Denk other boot loader or by a debugger which performs 3172e03f3169SWolfgang Denk these initializations itself. 31738aa1a2d1Swdenk 3174401bb30bSAneesh V- CONFIG_SPL_BUILD 3175df81238bSMagnus Lilja Modifies the behaviour of start.S when compiling a loader 3176df81238bSMagnus Lilja that is executed before the actual U-Boot. E.g. when 3177df81238bSMagnus Lilja compiling a NAND SPL. 3178400558b5Swdenk 3179d8834a13SMatthias Weisser- CONFIG_USE_ARCH_MEMCPY 3180d8834a13SMatthias Weisser CONFIG_USE_ARCH_MEMSET 3181d8834a13SMatthias Weisser If these options are used a optimized version of memcpy/memset will 3182d8834a13SMatthias Weisser be used if available. These functions may be faster under some 3183d8834a13SMatthias Weisser conditions but may increase the binary size. 3184d8834a13SMatthias Weisser 3185c609719bSwdenkBuilding the Software: 3186c609719bSwdenk====================== 3187c609719bSwdenk 3188218ca724SWolfgang DenkBuilding U-Boot has been tested in several native build environments 3189218ca724SWolfgang Denkand in many different cross environments. Of course we cannot support 3190218ca724SWolfgang Denkall possibly existing versions of cross development tools in all 3191218ca724SWolfgang Denk(potentially obsolete) versions. In case of tool chain problems we 3192218ca724SWolfgang Denkrecommend to use the ELDK (see http://www.denx.de/wiki/DULG/ELDK) 3193218ca724SWolfgang Denkwhich is extensively used to build and test U-Boot. 3194c609719bSwdenk 3195218ca724SWolfgang DenkIf you are not using a native environment, it is assumed that you 3196218ca724SWolfgang Denkhave GNU cross compiling tools available in your path. In this case, 3197218ca724SWolfgang Denkyou must set the environment variable CROSS_COMPILE in your shell. 3198218ca724SWolfgang DenkNote that no changes to the Makefile or any other source files are 3199218ca724SWolfgang Denknecessary. For example using the ELDK on a 4xx CPU, please enter: 3200c609719bSwdenk 3201218ca724SWolfgang Denk $ CROSS_COMPILE=ppc_4xx- 3202218ca724SWolfgang Denk $ export CROSS_COMPILE 3203c609719bSwdenk 32042f8d396bSPeter TyserNote: If you wish to generate Windows versions of the utilities in 32052f8d396bSPeter Tyser the tools directory you can use the MinGW toolchain 32062f8d396bSPeter Tyser (http://www.mingw.org). Set your HOST tools to the MinGW 32072f8d396bSPeter Tyser toolchain and execute 'make tools'. For example: 32082f8d396bSPeter Tyser 32092f8d396bSPeter Tyser $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools 32102f8d396bSPeter Tyser 32112f8d396bSPeter Tyser Binaries such as tools/mkimage.exe will be created which can 32122f8d396bSPeter Tyser be executed on computers running Windows. 32132f8d396bSPeter Tyser 3214c609719bSwdenkU-Boot is intended to be simple to build. After installing the 3215c609719bSwdenksources you must configure U-Boot for one specific board type. This 3216c609719bSwdenkis done by typing: 3217c609719bSwdenk 3218c609719bSwdenk make NAME_config 3219c609719bSwdenk 3220218ca724SWolfgang Denkwhere "NAME_config" is the name of one of the existing configu- 3221218ca724SWolfgang Denkrations; see the main Makefile for supported names. 322254387ac9Swdenk 3223c609719bSwdenkNote: for some board special configuration names may exist; check if 3224c609719bSwdenk additional information is available from the board vendor; for 32252729af9dSwdenk instance, the TQM823L systems are available without (standard) 32262729af9dSwdenk or with LCD support. You can select such additional "features" 322711ccc33fSMarcel Ziswiler when choosing the configuration, i. e. 3228c609719bSwdenk 32292729af9dSwdenk make TQM823L_config 32302729af9dSwdenk - will configure for a plain TQM823L, i. e. no LCD support 3231c609719bSwdenk 3232c609719bSwdenk make TQM823L_LCD_config 3233c609719bSwdenk - will configure for a TQM823L with U-Boot console on LCD 3234c609719bSwdenk 3235c609719bSwdenk etc. 3236c609719bSwdenk 3237c609719bSwdenk 3238c609719bSwdenkFinally, type "make all", and you should get some working U-Boot 32397152b1d0Swdenkimages ready for download to / installation on your system: 3240c609719bSwdenk 3241c609719bSwdenk- "u-boot.bin" is a raw binary image 3242c609719bSwdenk- "u-boot" is an image in ELF binary format 3243c609719bSwdenk- "u-boot.srec" is in Motorola S-Record format 3244c609719bSwdenk 3245baf31249SMarian BalakowiczBy default the build is performed locally and the objects are saved 3246baf31249SMarian Balakowiczin the source directory. One of the two methods can be used to change 3247baf31249SMarian Balakowiczthis behavior and build U-Boot to some external directory: 3248baf31249SMarian Balakowicz 3249baf31249SMarian Balakowicz1. Add O= to the make command line invocations: 3250baf31249SMarian Balakowicz 3251baf31249SMarian Balakowicz make O=/tmp/build distclean 3252baf31249SMarian Balakowicz make O=/tmp/build NAME_config 3253baf31249SMarian Balakowicz make O=/tmp/build all 3254baf31249SMarian Balakowicz 3255baf31249SMarian Balakowicz2. Set environment variable BUILD_DIR to point to the desired location: 3256baf31249SMarian Balakowicz 3257baf31249SMarian Balakowicz export BUILD_DIR=/tmp/build 3258baf31249SMarian Balakowicz make distclean 3259baf31249SMarian Balakowicz make NAME_config 3260baf31249SMarian Balakowicz make all 3261baf31249SMarian Balakowicz 3262baf31249SMarian BalakowiczNote that the command line "O=" setting overrides the BUILD_DIR environment 3263baf31249SMarian Balakowiczvariable. 3264baf31249SMarian Balakowicz 3265c609719bSwdenk 3266c609719bSwdenkPlease be aware that the Makefiles assume you are using GNU make, so 3267c609719bSwdenkfor instance on NetBSD you might need to use "gmake" instead of 3268c609719bSwdenknative "make". 3269c609719bSwdenk 3270c609719bSwdenk 3271c609719bSwdenkIf the system board that you have is not listed, then you will need 3272c609719bSwdenkto port U-Boot to your hardware platform. To do this, follow these 3273c609719bSwdenksteps: 3274c609719bSwdenk 3275c609719bSwdenk1. Add a new configuration option for your board to the toplevel 327685ec0bccSwdenk "Makefile" and to the "MAKEALL" script, using the existing 327785ec0bccSwdenk entries as examples. Note that here and at many other places 32787152b1d0Swdenk boards and other names are listed in alphabetical sort order. Please 327985ec0bccSwdenk keep this order. 3280c609719bSwdenk2. Create a new directory to hold your board specific code. Add any 328185ec0bccSwdenk files you need. In your board directory, you will need at least 328285ec0bccSwdenk the "Makefile", a "<board>.c", "flash.c" and "u-boot.lds". 328385ec0bccSwdenk3. Create a new configuration file "include/configs/<board>.h" for 328485ec0bccSwdenk your board 3285c609719bSwdenk3. If you're porting U-Boot to a new CPU, then also create a new 3286c609719bSwdenk directory to hold your CPU specific code. Add any files you need. 328785ec0bccSwdenk4. Run "make <board>_config" with your new name. 3288c609719bSwdenk5. Type "make", and you should get a working "u-boot.srec" file 3289c609719bSwdenk to be installed on your target system. 329085ec0bccSwdenk6. Debug and solve any problems that might arise. 3291c609719bSwdenk [Of course, this last step is much harder than it sounds.] 3292c609719bSwdenk 3293c609719bSwdenk 3294c609719bSwdenkTesting of U-Boot Modifications, Ports to New Hardware, etc.: 3295c609719bSwdenk============================================================== 3296c609719bSwdenk 3297c609719bSwdenkIf you have modified U-Boot sources (for instance added a new board 3298c609719bSwdenkor support for new devices, a new CPU, etc.) you are expected to 3299c609719bSwdenkprovide feedback to the other developers. The feedback normally takes 3300c609719bSwdenkthe form of a "patch", i. e. a context diff against a certain (latest 3301218ca724SWolfgang Denkofficial or latest in the git repository) version of U-Boot sources. 3302c609719bSwdenk 3303c609719bSwdenkBut before you submit such a patch, please verify that your modifi- 3304c609719bSwdenkcation did not break existing code. At least make sure that *ALL* of 3305c609719bSwdenkthe supported boards compile WITHOUT ANY compiler warnings. To do so, 3306c609719bSwdenkjust run the "MAKEALL" script, which will configure and build U-Boot 3307c609719bSwdenkfor ALL supported system. Be warned, this will take a while. You can 33087152b1d0Swdenkselect which (cross) compiler to use by passing a `CROSS_COMPILE' 3309218ca724SWolfgang Denkenvironment variable to the script, i. e. to use the ELDK cross tools 3310218ca724SWolfgang Denkyou can type 3311c609719bSwdenk 3312c609719bSwdenk CROSS_COMPILE=ppc_8xx- MAKEALL 3313c609719bSwdenk 3314c609719bSwdenkor to build on a native PowerPC system you can type 3315c609719bSwdenk 3316c609719bSwdenk CROSS_COMPILE=' ' MAKEALL 3317c609719bSwdenk 3318218ca724SWolfgang DenkWhen using the MAKEALL script, the default behaviour is to build 3319218ca724SWolfgang DenkU-Boot in the source directory. This location can be changed by 3320218ca724SWolfgang Denksetting the BUILD_DIR environment variable. Also, for each target 3321218ca724SWolfgang Denkbuilt, the MAKEALL script saves two log files (<target>.ERR and 3322218ca724SWolfgang Denk<target>.MAKEALL) in the <source dir>/LOG directory. This default 3323218ca724SWolfgang Denklocation can be changed by setting the MAKEALL_LOGDIR environment 3324218ca724SWolfgang Denkvariable. For example: 3325baf31249SMarian Balakowicz 3326baf31249SMarian Balakowicz export BUILD_DIR=/tmp/build 3327baf31249SMarian Balakowicz export MAKEALL_LOGDIR=/tmp/log 3328baf31249SMarian Balakowicz CROSS_COMPILE=ppc_8xx- MAKEALL 3329baf31249SMarian Balakowicz 3330218ca724SWolfgang DenkWith the above settings build objects are saved in the /tmp/build, 3331218ca724SWolfgang Denklog files are saved in the /tmp/log and the source tree remains clean 3332218ca724SWolfgang Denkduring the whole build process. 3333baf31249SMarian Balakowicz 3334baf31249SMarian Balakowicz 3335c609719bSwdenkSee also "U-Boot Porting Guide" below. 3336c609719bSwdenk 3337c609719bSwdenk 3338c609719bSwdenkMonitor Commands - Overview: 3339c609719bSwdenk============================ 3340c609719bSwdenk 3341c609719bSwdenkgo - start application at address 'addr' 3342c609719bSwdenkrun - run commands in an environment variable 3343c609719bSwdenkbootm - boot application image from memory 3344c609719bSwdenkbootp - boot image via network using BootP/TFTP protocol 3345c609719bSwdenktftpboot- boot image via network using TFTP protocol 3346c609719bSwdenk and env variables "ipaddr" and "serverip" 3347c609719bSwdenk (and eventually "gatewayip") 3348*1fb7cd49SSimon Glasstftpput - upload a file via network using TFTP protocol 3349c609719bSwdenkrarpboot- boot image via network using RARP/TFTP protocol 3350c609719bSwdenkdiskboot- boot from IDE devicebootd - boot default, i.e., run 'bootcmd' 3351c609719bSwdenkloads - load S-Record file over serial line 3352c609719bSwdenkloadb - load binary file over serial line (kermit mode) 3353c609719bSwdenkmd - memory display 3354c609719bSwdenkmm - memory modify (auto-incrementing) 3355c609719bSwdenknm - memory modify (constant address) 3356c609719bSwdenkmw - memory write (fill) 3357c609719bSwdenkcp - memory copy 3358c609719bSwdenkcmp - memory compare 3359c609719bSwdenkcrc32 - checksum calculation 33600f89c54bSPeter Tyseri2c - I2C sub-system 3361c609719bSwdenksspi - SPI utility commands 3362c609719bSwdenkbase - print or set address offset 3363c609719bSwdenkprintenv- print environment variables 3364c609719bSwdenksetenv - set environment variables 3365c609719bSwdenksaveenv - save environment variables to persistent storage 3366c609719bSwdenkprotect - enable or disable FLASH write protection 3367c609719bSwdenkerase - erase FLASH memory 3368c609719bSwdenkflinfo - print FLASH memory information 3369c609719bSwdenkbdinfo - print Board Info structure 3370c609719bSwdenkiminfo - print header information for application image 3371c609719bSwdenkconinfo - print console devices and informations 3372c609719bSwdenkide - IDE sub-system 3373c609719bSwdenkloop - infinite loop on address range 337456523f12Swdenkloopw - infinite write loop on address range 3375c609719bSwdenkmtest - simple RAM test 3376c609719bSwdenkicache - enable or disable instruction cache 3377c609719bSwdenkdcache - enable or disable data cache 3378c609719bSwdenkreset - Perform RESET of the CPU 3379c609719bSwdenkecho - echo args to console 3380c609719bSwdenkversion - print monitor version 3381c609719bSwdenkhelp - print online help 3382c609719bSwdenk? - alias for 'help' 3383c609719bSwdenk 3384c609719bSwdenk 3385c609719bSwdenkMonitor Commands - Detailed Description: 3386c609719bSwdenk======================================== 3387c609719bSwdenk 3388c609719bSwdenkTODO. 3389c609719bSwdenk 3390c609719bSwdenkFor now: just type "help <command>". 3391c609719bSwdenk 3392c609719bSwdenk 3393c609719bSwdenkEnvironment Variables: 3394c609719bSwdenk====================== 3395c609719bSwdenk 3396c609719bSwdenkU-Boot supports user configuration using Environment Variables which 3397c609719bSwdenkcan be made persistent by saving to Flash memory. 3398c609719bSwdenk 3399c609719bSwdenkEnvironment Variables are set using "setenv", printed using 3400c609719bSwdenk"printenv", and saved to Flash using "saveenv". Using "setenv" 3401c609719bSwdenkwithout a value can be used to delete a variable from the 3402c609719bSwdenkenvironment. As long as you don't save the environment you are 3403c609719bSwdenkworking with an in-memory copy. In case the Flash area containing the 3404c609719bSwdenkenvironment is erased by accident, a default environment is provided. 3405c609719bSwdenk 3406c96f86eeSWolfgang DenkSome configuration options can be set using Environment Variables. 3407c96f86eeSWolfgang Denk 3408c96f86eeSWolfgang DenkList of environment variables (most likely not complete): 3409c609719bSwdenk 3410c609719bSwdenk baudrate - see CONFIG_BAUDRATE 3411c609719bSwdenk 3412c609719bSwdenk bootdelay - see CONFIG_BOOTDELAY 3413c609719bSwdenk 3414c609719bSwdenk bootcmd - see CONFIG_BOOTCOMMAND 3415c609719bSwdenk 3416c609719bSwdenk bootargs - Boot arguments when booting an RTOS image 3417c609719bSwdenk 3418c609719bSwdenk bootfile - Name of the image to load with TFTP 3419c609719bSwdenk 34207d721e34SBartlomiej Sieka bootm_low - Memory range available for image processing in the bootm 34217d721e34SBartlomiej Sieka command can be restricted. This variable is given as 34227d721e34SBartlomiej Sieka a hexadecimal number and defines lowest address allowed 34237d721e34SBartlomiej Sieka for use by the bootm command. See also "bootm_size" 34247d721e34SBartlomiej Sieka environment variable. Address defined by "bootm_low" is 34257d721e34SBartlomiej Sieka also the base of the initial memory mapping for the Linux 3426c3624e6eSGrant Likely kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and 3427c3624e6eSGrant Likely bootm_mapsize. 3428c3624e6eSGrant Likely 3429c3624e6eSGrant Likely bootm_mapsize - Size of the initial memory mapping for the Linux kernel. 3430c3624e6eSGrant Likely This variable is given as a hexadecimal number and it 3431c3624e6eSGrant Likely defines the size of the memory region starting at base 3432c3624e6eSGrant Likely address bootm_low that is accessible by the Linux kernel 3433c3624e6eSGrant Likely during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used 3434c3624e6eSGrant Likely as the default value if it is defined, and bootm_size is 3435c3624e6eSGrant Likely used otherwise. 34367d721e34SBartlomiej Sieka 34377d721e34SBartlomiej Sieka bootm_size - Memory range available for image processing in the bootm 34387d721e34SBartlomiej Sieka command can be restricted. This variable is given as 34397d721e34SBartlomiej Sieka a hexadecimal number and defines the size of the region 34407d721e34SBartlomiej Sieka allowed for use by the bootm command. See also "bootm_low" 34417d721e34SBartlomiej Sieka environment variable. 34427d721e34SBartlomiej Sieka 34434bae9090SBartlomiej Sieka updatefile - Location of the software update file on a TFTP server, used 34444bae9090SBartlomiej Sieka by the automatic software update feature. Please refer to 34454bae9090SBartlomiej Sieka documentation in doc/README.update for more details. 34464bae9090SBartlomiej Sieka 3447c609719bSwdenk autoload - if set to "no" (any string beginning with 'n'), 3448c609719bSwdenk "bootp" will just load perform a lookup of the 3449c609719bSwdenk configuration from the BOOTP server, but not try to 3450c609719bSwdenk load any image using TFTP 3451c609719bSwdenk 3452c609719bSwdenk autostart - if set to "yes", an image loaded using the "bootp", 3453c609719bSwdenk "rarpboot", "tftpboot" or "diskboot" commands will 3454c609719bSwdenk be automatically started (by internally calling 3455c609719bSwdenk "bootm") 3456c609719bSwdenk 34574a6fd34bSwdenk If set to "no", a standalone image passed to the 34584a6fd34bSwdenk "bootm" command will be copied to the load address 34594a6fd34bSwdenk (and eventually uncompressed), but NOT be started. 34604a6fd34bSwdenk This can be used to load and uncompress arbitrary 34614a6fd34bSwdenk data. 34624a6fd34bSwdenk 3463a28afca5SDavid A. Long fdt_high - if set this restricts the maximum address that the 3464a28afca5SDavid A. Long flattened device tree will be copied into upon boot. 3465a28afca5SDavid A. Long If this is set to the special value 0xFFFFFFFF then 3466a28afca5SDavid A. Long the fdt will not be copied at all on boot. For this 3467a28afca5SDavid A. Long to work it must reside in writable memory, have 3468a28afca5SDavid A. Long sufficient padding on the end of it for u-boot to 3469a28afca5SDavid A. Long add the information it needs into it, and the memory 3470a28afca5SDavid A. Long must be accessible by the kernel. 3471a28afca5SDavid A. Long 347217ea1177Swdenk i2cfast - (PPC405GP|PPC405EP only) 347317ea1177Swdenk if set to 'y' configures Linux I2C driver for fast 347417ea1177Swdenk mode (400kHZ). This environment variable is used in 347517ea1177Swdenk initialization code. So, for changes to be effective 347617ea1177Swdenk it must be saved and board must be reset. 347717ea1177Swdenk 3478c609719bSwdenk initrd_high - restrict positioning of initrd images: 3479c609719bSwdenk If this variable is not set, initrd images will be 3480c609719bSwdenk copied to the highest possible address in RAM; this 3481c609719bSwdenk is usually what you want since it allows for 3482c609719bSwdenk maximum initrd size. If for some reason you want to 3483c609719bSwdenk make sure that the initrd image is loaded below the 34846d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_BOOTMAPSZ limit, you can set this environment 3485c609719bSwdenk variable to a value of "no" or "off" or "0". 3486c609719bSwdenk Alternatively, you can set it to a maximum upper 3487c609719bSwdenk address to use (U-Boot will still check that it 3488c609719bSwdenk does not overwrite the U-Boot stack and data). 3489c609719bSwdenk 3490c609719bSwdenk For instance, when you have a system with 16 MB 34917152b1d0Swdenk RAM, and want to reserve 4 MB from use by Linux, 3492c609719bSwdenk you can do this by adding "mem=12M" to the value of 3493c609719bSwdenk the "bootargs" variable. However, now you must make 34947152b1d0Swdenk sure that the initrd image is placed in the first 3495c609719bSwdenk 12 MB as well - this can be done with 3496c609719bSwdenk 3497c609719bSwdenk setenv initrd_high 00c00000 3498c609719bSwdenk 349938b99261Swdenk If you set initrd_high to 0xFFFFFFFF, this is an 350038b99261Swdenk indication to U-Boot that all addresses are legal 350138b99261Swdenk for the Linux kernel, including addresses in flash 350238b99261Swdenk memory. In this case U-Boot will NOT COPY the 350338b99261Swdenk ramdisk at all. This may be useful to reduce the 350438b99261Swdenk boot time on your system, but requires that this 350538b99261Swdenk feature is supported by your Linux kernel. 350638b99261Swdenk 3507c609719bSwdenk ipaddr - IP address; needed for tftpboot command 3508c609719bSwdenk 3509c609719bSwdenk loadaddr - Default load address for commands like "bootp", 3510dc7c9a1aSwdenk "rarpboot", "tftpboot", "loadb" or "diskboot" 3511c609719bSwdenk 3512c609719bSwdenk loads_echo - see CONFIG_LOADS_ECHO 3513c609719bSwdenk 3514c609719bSwdenk serverip - TFTP server IP address; needed for tftpboot command 3515c609719bSwdenk 3516c609719bSwdenk bootretry - see CONFIG_BOOT_RETRY_TIME 3517c609719bSwdenk 3518c609719bSwdenk bootdelaykey - see CONFIG_AUTOBOOT_DELAY_STR 3519c609719bSwdenk 3520c609719bSwdenk bootstopkey - see CONFIG_AUTOBOOT_STOP_STR 3521c609719bSwdenk 3522e2a53458SMike Frysinger ethprime - controls which interface is used first. 3523a3d991bdSwdenk 3524e2a53458SMike Frysinger ethact - controls which interface is currently active. 3525e2a53458SMike Frysinger For example you can do the following 3526a3d991bdSwdenk 352748690d80SHeiko Schocher => setenv ethact FEC 352848690d80SHeiko Schocher => ping 192.168.0.1 # traffic sent on FEC 352948690d80SHeiko Schocher => setenv ethact SCC 353048690d80SHeiko Schocher => ping 10.0.0.1 # traffic sent on SCC 3531a3d991bdSwdenk 3532e1692577SMatthias Fuchs ethrotate - When set to "no" U-Boot does not go through all 3533e1692577SMatthias Fuchs available network interfaces. 3534e1692577SMatthias Fuchs It just stays at the currently selected interface. 3535e1692577SMatthias Fuchs 3536a3d991bdSwdenk netretry - When set to "no" each network operation will 3537a3d991bdSwdenk either succeed or fail without retrying. 35386e592385Swdenk When set to "once" the network operation will 35396e592385Swdenk fail when all the available network interfaces 35406e592385Swdenk are tried once without success. 3541a3d991bdSwdenk Useful on scripts which control the retry operation 3542a3d991bdSwdenk themselves. 3543a3d991bdSwdenk 3544b4e2f89dSJean-Christophe PLAGNIOL-VILLARD npe_ucode - set load address for the NPE microcode 3545a1cf027aSJean-Christophe PLAGNIOL-VILLARD 354628cb9375SWolfgang Denk tftpsrcport - If this is set, the value is used for TFTP's 3547ecb0ccd9SWolfgang Denk UDP source port. 3548ecb0ccd9SWolfgang Denk 354928cb9375SWolfgang Denk tftpdstport - If this is set, the value is used for TFTP's UDP 355028cb9375SWolfgang Denk destination port instead of the Well Know Port 69. 355128cb9375SWolfgang Denk 3552c96f86eeSWolfgang Denk tftpblocksize - Block size to use for TFTP transfers; if not set, 3553c96f86eeSWolfgang Denk we use the TFTP server's default block size 3554c96f86eeSWolfgang Denk 3555c96f86eeSWolfgang Denk tftptimeout - Retransmission timeout for TFTP packets (in milli- 3556c96f86eeSWolfgang Denk seconds, minimum value is 1000 = 1 second). Defines 3557c96f86eeSWolfgang Denk when a packet is considered to be lost so it has to 3558c96f86eeSWolfgang Denk be retransmitted. The default is 5000 = 5 seconds. 3559c96f86eeSWolfgang Denk Lowering this value may make downloads succeed 3560c96f86eeSWolfgang Denk faster in networks with high packet loss rates or 3561c96f86eeSWolfgang Denk with unreliable TFTP servers. 3562c96f86eeSWolfgang Denk 3563a3d991bdSwdenk vlan - When set to a value < 4095 the traffic over 356411ccc33fSMarcel Ziswiler Ethernet is encapsulated/received over 802.1q 3565a3d991bdSwdenk VLAN tagged frames. 3566c609719bSwdenk 3567dc0b7b0eSJason HobbsThe following image location variables contain the location of images 3568dc0b7b0eSJason Hobbsused in booting. The "Image" column gives the role of the image and is 3569dc0b7b0eSJason Hobbsnot an environment variable name. The other columns are environment 3570dc0b7b0eSJason Hobbsvariable names. "File Name" gives the name of the file on a TFTP 3571dc0b7b0eSJason Hobbsserver, "RAM Address" gives the location in RAM the image will be 3572dc0b7b0eSJason Hobbsloaded to, and "Flash Location" gives the image's address in NOR 3573dc0b7b0eSJason Hobbsflash or offset in NAND flash. 3574dc0b7b0eSJason Hobbs 3575dc0b7b0eSJason Hobbs*Note* - these variables don't have to be defined for all boards, some 3576dc0b7b0eSJason Hobbsboards currenlty use other variables for these purposes, and some 3577dc0b7b0eSJason Hobbsboards use these variables for other purposes. 3578dc0b7b0eSJason Hobbs 3579dc0b7b0eSJason HobbsImage File Name RAM Address Flash Location 3580dc0b7b0eSJason Hobbs----- --------- ----------- -------------- 3581dc0b7b0eSJason Hobbsu-boot u-boot u-boot_addr_r u-boot_addr 3582dc0b7b0eSJason HobbsLinux kernel bootfile kernel_addr_r kernel_addr 3583dc0b7b0eSJason Hobbsdevice tree blob fdtfile fdt_addr_r fdt_addr 3584dc0b7b0eSJason Hobbsramdisk ramdiskfile ramdisk_addr_r ramdisk_addr 3585dc0b7b0eSJason Hobbs 3586c609719bSwdenkThe following environment variables may be used and automatically 3587c609719bSwdenkupdated by the network boot commands ("bootp" and "rarpboot"), 3588c609719bSwdenkdepending the information provided by your boot server: 3589c609719bSwdenk 3590c609719bSwdenk bootfile - see above 3591c609719bSwdenk dnsip - IP address of your Domain Name Server 3592fe389a82Sstroese dnsip2 - IP address of your secondary Domain Name Server 3593c609719bSwdenk gatewayip - IP address of the Gateway (Router) to use 3594c609719bSwdenk hostname - Target hostname 3595c609719bSwdenk ipaddr - see above 3596c609719bSwdenk netmask - Subnet Mask 3597c609719bSwdenk rootpath - Pathname of the root filesystem on the NFS server 3598c609719bSwdenk serverip - see above 3599c609719bSwdenk 3600c609719bSwdenk 3601c609719bSwdenkThere are two special Environment Variables: 3602c609719bSwdenk 3603c609719bSwdenk serial# - contains hardware identification information such 3604c609719bSwdenk as type string and/or serial number 3605c609719bSwdenk ethaddr - Ethernet address 3606c609719bSwdenk 3607c609719bSwdenkThese variables can be set only once (usually during manufacturing of 3608c609719bSwdenkthe board). U-Boot refuses to delete or overwrite these variables 3609c609719bSwdenkonce they have been set once. 3610c609719bSwdenk 3611c609719bSwdenk 3612c1551ea8SstroeseFurther special Environment Variables: 3613c1551ea8Sstroese 3614c1551ea8Sstroese ver - Contains the U-Boot version string as printed 3615c1551ea8Sstroese with the "version" command. This variable is 3616c1551ea8Sstroese readonly (see CONFIG_VERSION_VARIABLE). 3617c1551ea8Sstroese 3618c1551ea8Sstroese 3619c609719bSwdenkPlease note that changes to some configuration parameters may take 3620c609719bSwdenkonly effect after the next boot (yes, that's just like Windoze :-). 3621c609719bSwdenk 3622c609719bSwdenk 3623f07771ccSwdenkCommand Line Parsing: 3624f07771ccSwdenk===================== 3625f07771ccSwdenk 3626f07771ccSwdenkThere are two different command line parsers available with U-Boot: 36277152b1d0Swdenkthe old "simple" one, and the much more powerful "hush" shell: 3628f07771ccSwdenk 3629f07771ccSwdenkOld, simple command line parser: 3630f07771ccSwdenk-------------------------------- 3631f07771ccSwdenk 3632f07771ccSwdenk- supports environment variables (through setenv / saveenv commands) 3633f07771ccSwdenk- several commands on one line, separated by ';' 3634fe126d8bSWolfgang Denk- variable substitution using "... ${name} ..." syntax 3635f07771ccSwdenk- special characters ('$', ';') can be escaped by prefixing with '\', 3636f07771ccSwdenk for example: 3637fe126d8bSWolfgang Denk setenv bootcmd bootm \${address} 3638f07771ccSwdenk- You can also escape text by enclosing in single apostrophes, for example: 3639f07771ccSwdenk setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off' 3640f07771ccSwdenk 3641f07771ccSwdenkHush shell: 3642f07771ccSwdenk----------- 3643f07771ccSwdenk 3644f07771ccSwdenk- similar to Bourne shell, with control structures like 3645f07771ccSwdenk if...then...else...fi, for...do...done; while...do...done, 3646f07771ccSwdenk until...do...done, ... 3647f07771ccSwdenk- supports environment ("global") variables (through setenv / saveenv 3648f07771ccSwdenk commands) and local shell variables (through standard shell syntax 3649f07771ccSwdenk "name=value"); only environment variables can be used with "run" 3650f07771ccSwdenk command 3651f07771ccSwdenk 3652f07771ccSwdenkGeneral rules: 3653f07771ccSwdenk-------------- 3654f07771ccSwdenk 3655f07771ccSwdenk(1) If a command line (or an environment variable executed by a "run" 3656f07771ccSwdenk command) contains several commands separated by semicolon, and 3657f07771ccSwdenk one of these commands fails, then the remaining commands will be 3658f07771ccSwdenk executed anyway. 3659f07771ccSwdenk 3660f07771ccSwdenk(2) If you execute several variables with one call to run (i. e. 366111ccc33fSMarcel Ziswiler calling run with a list of variables as arguments), any failing 3662f07771ccSwdenk command will cause "run" to terminate, i. e. the remaining 3663f07771ccSwdenk variables are not executed. 3664f07771ccSwdenk 3665c609719bSwdenkNote for Redundant Ethernet Interfaces: 3666c609719bSwdenk======================================= 3667c609719bSwdenk 366811ccc33fSMarcel ZiswilerSome boards come with redundant Ethernet interfaces; U-Boot supports 3669c609719bSwdenksuch configurations and is capable of automatic selection of a 36707152b1d0Swdenk"working" interface when needed. MAC assignment works as follows: 3671c609719bSwdenk 3672c609719bSwdenkNetwork interfaces are numbered eth0, eth1, eth2, ... Corresponding 3673c609719bSwdenkMAC addresses can be stored in the environment as "ethaddr" (=>eth0), 3674c609719bSwdenk"eth1addr" (=>eth1), "eth2addr", ... 3675c609719bSwdenk 3676c609719bSwdenkIf the network interface stores some valid MAC address (for instance 3677c609719bSwdenkin SROM), this is used as default address if there is NO correspon- 3678c609719bSwdenkding setting in the environment; if the corresponding environment 3679c609719bSwdenkvariable is set, this overrides the settings in the card; that means: 3680c609719bSwdenk 3681c609719bSwdenko If the SROM has a valid MAC address, and there is no address in the 3682c609719bSwdenk environment, the SROM's address is used. 3683c609719bSwdenk 3684c609719bSwdenko If there is no valid address in the SROM, and a definition in the 3685c609719bSwdenk environment exists, then the value from the environment variable is 3686c609719bSwdenk used. 3687c609719bSwdenk 3688c609719bSwdenko If both the SROM and the environment contain a MAC address, and 3689c609719bSwdenk both addresses are the same, this MAC address is used. 3690c609719bSwdenk 3691c609719bSwdenko If both the SROM and the environment contain a MAC address, and the 3692c609719bSwdenk addresses differ, the value from the environment is used and a 3693c609719bSwdenk warning is printed. 3694c609719bSwdenk 3695c609719bSwdenko If neither SROM nor the environment contain a MAC address, an error 3696c609719bSwdenk is raised. 3697c609719bSwdenk 3698ecee9324SBen WarrenIf Ethernet drivers implement the 'write_hwaddr' function, valid MAC addresses 3699ecee9324SBen Warrenwill be programmed into hardware as part of the initialization process. This 3700ecee9324SBen Warrenmay be skipped by setting the appropriate 'ethmacskip' environment variable. 3701ecee9324SBen WarrenThe naming convention is as follows: 3702ecee9324SBen Warren"ethmacskip" (=>eth0), "eth1macskip" (=>eth1) etc. 3703c609719bSwdenk 3704c609719bSwdenkImage Formats: 3705c609719bSwdenk============== 3706c609719bSwdenk 37073310c549SMarian BalakowiczU-Boot is capable of booting (and performing other auxiliary operations on) 37083310c549SMarian Balakowiczimages in two formats: 37093310c549SMarian Balakowicz 37103310c549SMarian BalakowiczNew uImage format (FIT) 37113310c549SMarian Balakowicz----------------------- 37123310c549SMarian Balakowicz 37133310c549SMarian BalakowiczFlexible and powerful format based on Flattened Image Tree -- FIT (similar 37143310c549SMarian Balakowiczto Flattened Device Tree). It allows the use of images with multiple 37153310c549SMarian Balakowiczcomponents (several kernels, ramdisks, etc.), with contents protected by 37163310c549SMarian BalakowiczSHA1, MD5 or CRC32. More details are found in the doc/uImage.FIT directory. 37173310c549SMarian Balakowicz 37183310c549SMarian Balakowicz 37193310c549SMarian BalakowiczOld uImage format 37203310c549SMarian Balakowicz----------------- 37213310c549SMarian Balakowicz 37223310c549SMarian BalakowiczOld image format is based on binary files which can be basically anything, 37233310c549SMarian Balakowiczpreceded by a special header; see the definitions in include/image.h for 37243310c549SMarian Balakowiczdetails; basically, the header defines the following image properties: 3725c609719bSwdenk 3726c609719bSwdenk* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD, 3727c609719bSwdenk 4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks, 3728f5ed9e39SPeter Tyser LynxOS, pSOS, QNX, RTEMS, INTEGRITY; 3729f5ed9e39SPeter Tyser Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS, 3730f5ed9e39SPeter Tyser INTEGRITY). 37317b64fef3SWolfgang Denk* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86, 3732afc1ce82SMacpaul Lin IA64, MIPS, NDS32, Nios II, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit; 3733afc1ce82SMacpaul Lin Currently supported: ARM, AVR32, Intel x86, MIPS, NDS32, Nios II, PowerPC). 3734c29fdfc1Swdenk* Compression Type (uncompressed, gzip, bzip2) 3735c609719bSwdenk* Load Address 3736c609719bSwdenk* Entry Point 3737c609719bSwdenk* Image Name 3738c609719bSwdenk* Image Timestamp 3739c609719bSwdenk 3740c609719bSwdenkThe header is marked by a special Magic Number, and both the header 3741c609719bSwdenkand the data portions of the image are secured against corruption by 3742c609719bSwdenkCRC32 checksums. 3743c609719bSwdenk 3744c609719bSwdenk 3745c609719bSwdenkLinux Support: 3746c609719bSwdenk============== 3747c609719bSwdenk 3748c609719bSwdenkAlthough U-Boot should support any OS or standalone application 37497152b1d0Swdenkeasily, the main focus has always been on Linux during the design of 3750c609719bSwdenkU-Boot. 3751c609719bSwdenk 3752c609719bSwdenkU-Boot includes many features that so far have been part of some 3753c609719bSwdenkspecial "boot loader" code within the Linux kernel. Also, any 3754c609719bSwdenk"initrd" images to be used are no longer part of one big Linux image; 3755c609719bSwdenkinstead, kernel and "initrd" are separate images. This implementation 37567152b1d0Swdenkserves several purposes: 3757c609719bSwdenk 3758c609719bSwdenk- the same features can be used for other OS or standalone 3759c609719bSwdenk applications (for instance: using compressed images to reduce the 3760c609719bSwdenk Flash memory footprint) 3761c609719bSwdenk 3762c609719bSwdenk- it becomes much easier to port new Linux kernel versions because 37637152b1d0Swdenk lots of low-level, hardware dependent stuff are done by U-Boot 3764c609719bSwdenk 3765c609719bSwdenk- the same Linux kernel image can now be used with different "initrd" 3766c609719bSwdenk images; of course this also means that different kernel images can 3767c609719bSwdenk be run with the same "initrd". This makes testing easier (you don't 3768c609719bSwdenk have to build a new "zImage.initrd" Linux image when you just 3769c609719bSwdenk change a file in your "initrd"). Also, a field-upgrade of the 3770c609719bSwdenk software is easier now. 3771c609719bSwdenk 3772c609719bSwdenk 3773c609719bSwdenkLinux HOWTO: 3774c609719bSwdenk============ 3775c609719bSwdenk 3776c609719bSwdenkPorting Linux to U-Boot based systems: 3777c609719bSwdenk--------------------------------------- 3778c609719bSwdenk 3779c609719bSwdenkU-Boot cannot save you from doing all the necessary modifications to 3780c609719bSwdenkconfigure the Linux device drivers for use with your target hardware 3781c609719bSwdenk(no, we don't intend to provide a full virtual machine interface to 3782c609719bSwdenkLinux :-). 3783c609719bSwdenk 3784a47a12beSStefan RoeseBut now you can ignore ALL boot loader code (in arch/powerpc/mbxboot). 3785c609719bSwdenk 3786c609719bSwdenkJust make sure your machine specific header file (for instance 3787c609719bSwdenkinclude/asm-ppc/tqm8xx.h) includes the same definition of the Board 37881dc30693SMarkus HeidelbergInformation structure as we define in include/asm-<arch>/u-boot.h, 37891dc30693SMarkus Heidelbergand make sure that your definition of IMAP_ADDR uses the same value 37906d0f6bcfSJean-Christophe PLAGNIOL-VILLARDas your U-Boot configuration in CONFIG_SYS_IMMR. 3791c609719bSwdenk 3792c609719bSwdenk 3793c609719bSwdenkConfiguring the Linux kernel: 3794c609719bSwdenk----------------------------- 3795c609719bSwdenk 3796c609719bSwdenkNo specific requirements for U-Boot. Make sure you have some root 3797c609719bSwdenkdevice (initial ramdisk, NFS) for your target system. 3798c609719bSwdenk 3799c609719bSwdenk 3800c609719bSwdenkBuilding a Linux Image: 3801c609719bSwdenk----------------------- 3802c609719bSwdenk 380324ee89b9SwdenkWith U-Boot, "normal" build targets like "zImage" or "bzImage" are 380424ee89b9Swdenknot used. If you use recent kernel source, a new build target 380524ee89b9Swdenk"uImage" will exist which automatically builds an image usable by 380624ee89b9SwdenkU-Boot. Most older kernels also have support for a "pImage" target, 380724ee89b9Swdenkwhich was introduced for our predecessor project PPCBoot and uses a 380824ee89b9Swdenk100% compatible format. 3809c609719bSwdenk 3810c609719bSwdenkExample: 3811c609719bSwdenk 3812c609719bSwdenk make TQM850L_config 3813c609719bSwdenk make oldconfig 3814c609719bSwdenk make dep 381524ee89b9Swdenk make uImage 3816c609719bSwdenk 381724ee89b9SwdenkThe "uImage" build target uses a special tool (in 'tools/mkimage') to 381824ee89b9Swdenkencapsulate a compressed Linux kernel image with header information, 381924ee89b9SwdenkCRC32 checksum etc. for use with U-Boot. This is what we are doing: 3820c609719bSwdenk 382124ee89b9Swdenk* build a standard "vmlinux" kernel image (in ELF binary format): 382224ee89b9Swdenk 382324ee89b9Swdenk* convert the kernel into a raw binary image: 382424ee89b9Swdenk 382524ee89b9Swdenk ${CROSS_COMPILE}-objcopy -O binary \ 382624ee89b9Swdenk -R .note -R .comment \ 382724ee89b9Swdenk -S vmlinux linux.bin 382824ee89b9Swdenk 382924ee89b9Swdenk* compress the binary image: 383024ee89b9Swdenk 383124ee89b9Swdenk gzip -9 linux.bin 383224ee89b9Swdenk 383324ee89b9Swdenk* package compressed binary image for U-Boot: 383424ee89b9Swdenk 383524ee89b9Swdenk mkimage -A ppc -O linux -T kernel -C gzip \ 383624ee89b9Swdenk -a 0 -e 0 -n "Linux Kernel Image" \ 383724ee89b9Swdenk -d linux.bin.gz uImage 383824ee89b9Swdenk 383924ee89b9Swdenk 384024ee89b9SwdenkThe "mkimage" tool can also be used to create ramdisk images for use 384124ee89b9Swdenkwith U-Boot, either separated from the Linux kernel image, or 384224ee89b9Swdenkcombined into one file. "mkimage" encapsulates the images with a 64 384324ee89b9Swdenkbyte header containing information about target architecture, 384424ee89b9Swdenkoperating system, image type, compression method, entry points, time 384524ee89b9Swdenkstamp, CRC32 checksums, etc. 384624ee89b9Swdenk 384724ee89b9Swdenk"mkimage" can be called in two ways: to verify existing images and 384824ee89b9Swdenkprint the header information, or to build new images. 3849c609719bSwdenk 3850c609719bSwdenkIn the first form (with "-l" option) mkimage lists the information 3851c609719bSwdenkcontained in the header of an existing U-Boot image; this includes 3852c609719bSwdenkchecksum verification: 3853c609719bSwdenk 3854c609719bSwdenk tools/mkimage -l image 3855c609719bSwdenk -l ==> list image header information 3856c609719bSwdenk 3857c609719bSwdenkThe second form (with "-d" option) is used to build a U-Boot image 3858c609719bSwdenkfrom a "data file" which is used as image payload: 3859c609719bSwdenk 3860c609719bSwdenk tools/mkimage -A arch -O os -T type -C comp -a addr -e ep \ 3861c609719bSwdenk -n name -d data_file image 3862c609719bSwdenk -A ==> set architecture to 'arch' 3863c609719bSwdenk -O ==> set operating system to 'os' 3864c609719bSwdenk -T ==> set image type to 'type' 3865c609719bSwdenk -C ==> set compression type 'comp' 3866c609719bSwdenk -a ==> set load address to 'addr' (hex) 3867c609719bSwdenk -e ==> set entry point to 'ep' (hex) 3868c609719bSwdenk -n ==> set image name to 'name' 3869c609719bSwdenk -d ==> use image data from 'datafile' 3870c609719bSwdenk 387169459791SwdenkRight now, all Linux kernels for PowerPC systems use the same load 387269459791Swdenkaddress (0x00000000), but the entry point address depends on the 387369459791Swdenkkernel version: 3874c609719bSwdenk 3875c609719bSwdenk- 2.2.x kernels have the entry point at 0x0000000C, 387624ee89b9Swdenk- 2.3.x and later kernels have the entry point at 0x00000000. 3877c609719bSwdenk 3878c609719bSwdenkSo a typical call to build a U-Boot image would read: 3879c609719bSwdenk 388024ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 388124ee89b9Swdenk > -A ppc -O linux -T kernel -C gzip -a 0 -e 0 \ 3882a47a12beSStefan Roese > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz \ 388324ee89b9Swdenk > examples/uImage.TQM850L 388424ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3885c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3886c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3887c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 3888c609719bSwdenk Load Address: 0x00000000 388924ee89b9Swdenk Entry Point: 0x00000000 3890c609719bSwdenk 3891c609719bSwdenkTo verify the contents of the image (or check for corruption): 3892c609719bSwdenk 389324ee89b9Swdenk -> tools/mkimage -l examples/uImage.TQM850L 389424ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3895c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3896c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3897c609719bSwdenk Data Size: 335725 Bytes = 327.86 kB = 0.32 MB 3898c609719bSwdenk Load Address: 0x00000000 389924ee89b9Swdenk Entry Point: 0x00000000 3900c609719bSwdenk 3901c609719bSwdenkNOTE: for embedded systems where boot time is critical you can trade 3902c609719bSwdenkspeed for memory and install an UNCOMPRESSED image instead: this 3903c609719bSwdenkneeds more space in Flash, but boots much faster since it does not 3904c609719bSwdenkneed to be uncompressed: 3905c609719bSwdenk 3906a47a12beSStefan Roese -> gunzip /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux.gz 390724ee89b9Swdenk -> tools/mkimage -n '2.4.4 kernel for TQM850L' \ 390824ee89b9Swdenk > -A ppc -O linux -T kernel -C none -a 0 -e 0 \ 3909a47a12beSStefan Roese > -d /opt/elsk/ppc_8xx/usr/src/linux-2.4.4/arch/powerpc/coffboot/vmlinux \ 391024ee89b9Swdenk > examples/uImage.TQM850L-uncompressed 391124ee89b9Swdenk Image Name: 2.4.4 kernel for TQM850L 3912c609719bSwdenk Created: Wed Jul 19 02:34:59 2000 3913c609719bSwdenk Image Type: PowerPC Linux Kernel Image (uncompressed) 3914c609719bSwdenk Data Size: 792160 Bytes = 773.59 kB = 0.76 MB 3915c609719bSwdenk Load Address: 0x00000000 391624ee89b9Swdenk Entry Point: 0x00000000 3917c609719bSwdenk 3918c609719bSwdenk 3919c609719bSwdenkSimilar you can build U-Boot images from a 'ramdisk.image.gz' file 3920c609719bSwdenkwhen your kernel is intended to use an initial ramdisk: 3921c609719bSwdenk 3922c609719bSwdenk -> tools/mkimage -n 'Simple Ramdisk Image' \ 3923c609719bSwdenk > -A ppc -O linux -T ramdisk -C gzip \ 3924c609719bSwdenk > -d /LinuxPPC/images/SIMPLE-ramdisk.image.gz examples/simple-initrd 3925c609719bSwdenk Image Name: Simple Ramdisk Image 3926c609719bSwdenk Created: Wed Jan 12 14:01:50 2000 3927c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 3928c609719bSwdenk Data Size: 566530 Bytes = 553.25 kB = 0.54 MB 3929c609719bSwdenk Load Address: 0x00000000 3930c609719bSwdenk Entry Point: 0x00000000 3931c609719bSwdenk 3932c609719bSwdenk 3933c609719bSwdenkInstalling a Linux Image: 3934c609719bSwdenk------------------------- 3935c609719bSwdenk 3936c609719bSwdenkTo downloading a U-Boot image over the serial (console) interface, 3937c609719bSwdenkyou must convert the image to S-Record format: 3938c609719bSwdenk 3939c609719bSwdenk objcopy -I binary -O srec examples/image examples/image.srec 3940c609719bSwdenk 3941c609719bSwdenkThe 'objcopy' does not understand the information in the U-Boot 3942c609719bSwdenkimage header, so the resulting S-Record file will be relative to 3943c609719bSwdenkaddress 0x00000000. To load it to a given address, you need to 3944c609719bSwdenkspecify the target address as 'offset' parameter with the 'loads' 3945c609719bSwdenkcommand. 3946c609719bSwdenk 3947c609719bSwdenkExample: install the image to address 0x40100000 (which on the 3948c609719bSwdenkTQM8xxL is in the first Flash bank): 3949c609719bSwdenk 3950c609719bSwdenk => erase 40100000 401FFFFF 3951c609719bSwdenk 3952c609719bSwdenk .......... done 3953c609719bSwdenk Erased 8 sectors 3954c609719bSwdenk 3955c609719bSwdenk => loads 40100000 3956c609719bSwdenk ## Ready for S-Record download ... 3957c609719bSwdenk ~>examples/image.srec 3958c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 12 13 ... 3959c609719bSwdenk ... 3960c609719bSwdenk 15989 15990 15991 15992 3961c609719bSwdenk [file transfer complete] 3962c609719bSwdenk [connected] 3963c609719bSwdenk ## Start Addr = 0x00000000 3964c609719bSwdenk 3965c609719bSwdenk 3966c609719bSwdenkYou can check the success of the download using the 'iminfo' command; 3967c609719bSwdenkthis includes a checksum verification so you can be sure no data 3968c609719bSwdenkcorruption happened: 3969c609719bSwdenk 3970c609719bSwdenk => imi 40100000 3971c609719bSwdenk 3972c609719bSwdenk ## Checking Image at 40100000 ... 3973c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 3974c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 3975c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 3976c609719bSwdenk Load Address: 00000000 3977c609719bSwdenk Entry Point: 0000000c 3978c609719bSwdenk Verifying Checksum ... OK 3979c609719bSwdenk 3980c609719bSwdenk 3981c609719bSwdenkBoot Linux: 3982c609719bSwdenk----------- 3983c609719bSwdenk 3984c609719bSwdenkThe "bootm" command is used to boot an application that is stored in 3985c609719bSwdenkmemory (RAM or Flash). In case of a Linux kernel image, the contents 3986c609719bSwdenkof the "bootargs" environment variable is passed to the kernel as 3987c609719bSwdenkparameters. You can check and modify this variable using the 3988c609719bSwdenk"printenv" and "setenv" commands: 3989c609719bSwdenk 3990c609719bSwdenk 3991c609719bSwdenk => printenv bootargs 3992c609719bSwdenk bootargs=root=/dev/ram 3993c609719bSwdenk 3994c609719bSwdenk => setenv bootargs root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3995c609719bSwdenk 3996c609719bSwdenk => printenv bootargs 3997c609719bSwdenk bootargs=root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 3998c609719bSwdenk 3999c609719bSwdenk => bootm 40020000 4000c609719bSwdenk ## Booting Linux kernel at 40020000 ... 4001c609719bSwdenk Image Name: 2.2.13 for NFS on TQM850L 4002c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 4003c609719bSwdenk Data Size: 381681 Bytes = 372 kB = 0 MB 4004c609719bSwdenk Load Address: 00000000 4005c609719bSwdenk Entry Point: 0000000c 4006c609719bSwdenk Verifying Checksum ... OK 4007c609719bSwdenk Uncompressing Kernel Image ... OK 4008c609719bSwdenk 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 4009c609719bSwdenk Boot arguments: root=/dev/nfs rw nfsroot=10.0.0.2:/LinuxPPC nfsaddrs=10.0.0.99:10.0.0.2 4010c609719bSwdenk time_init: decrementer frequency = 187500000/60 4011c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 4012c609719bSwdenk Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000] 4013c609719bSwdenk ... 4014c609719bSwdenk 401511ccc33fSMarcel ZiswilerIf you want to boot a Linux kernel with initial RAM disk, you pass 40167152b1d0Swdenkthe memory addresses of both the kernel and the initrd image (PPBCOOT 4017c609719bSwdenkformat!) to the "bootm" command: 4018c609719bSwdenk 4019c609719bSwdenk => imi 40100000 40200000 4020c609719bSwdenk 4021c609719bSwdenk ## Checking Image at 40100000 ... 4022c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 4023c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 4024c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 4025c609719bSwdenk Load Address: 00000000 4026c609719bSwdenk Entry Point: 0000000c 4027c609719bSwdenk Verifying Checksum ... OK 4028c609719bSwdenk 4029c609719bSwdenk ## Checking Image at 40200000 ... 4030c609719bSwdenk Image Name: Simple Ramdisk Image 4031c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 4032c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 4033c609719bSwdenk Load Address: 00000000 4034c609719bSwdenk Entry Point: 00000000 4035c609719bSwdenk Verifying Checksum ... OK 4036c609719bSwdenk 4037c609719bSwdenk => bootm 40100000 40200000 4038c609719bSwdenk ## Booting Linux kernel at 40100000 ... 4039c609719bSwdenk Image Name: 2.2.13 for initrd on TQM850L 4040c609719bSwdenk Image Type: PowerPC Linux Kernel Image (gzip compressed) 4041c609719bSwdenk Data Size: 335725 Bytes = 327 kB = 0 MB 4042c609719bSwdenk Load Address: 00000000 4043c609719bSwdenk Entry Point: 0000000c 4044c609719bSwdenk Verifying Checksum ... OK 4045c609719bSwdenk Uncompressing Kernel Image ... OK 4046c609719bSwdenk ## Loading RAMDisk Image at 40200000 ... 4047c609719bSwdenk Image Name: Simple Ramdisk Image 4048c609719bSwdenk Image Type: PowerPC Linux RAMDisk Image (gzip compressed) 4049c609719bSwdenk Data Size: 566530 Bytes = 553 kB = 0 MB 4050c609719bSwdenk Load Address: 00000000 4051c609719bSwdenk Entry Point: 00000000 4052c609719bSwdenk Verifying Checksum ... OK 4053c609719bSwdenk Loading Ramdisk ... OK 4054c609719bSwdenk 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 4055c609719bSwdenk Boot arguments: root=/dev/ram 4056c609719bSwdenk time_init: decrementer frequency = 187500000/60 4057c609719bSwdenk Calibrating delay loop... 49.77 BogoMIPS 4058c609719bSwdenk ... 4059c609719bSwdenk RAMDISK: Compressed image found at block 0 4060c609719bSwdenk VFS: Mounted root (ext2 filesystem). 4061c609719bSwdenk 4062c609719bSwdenk bash# 4063c609719bSwdenk 40640267768eSMatthew McClintockBoot Linux and pass a flat device tree: 40650267768eSMatthew McClintock----------- 40660267768eSMatthew McClintock 40670267768eSMatthew McClintockFirst, U-Boot must be compiled with the appropriate defines. See the section 40680267768eSMatthew McClintocktitled "Linux Kernel Interface" above for a more in depth explanation. The 40690267768eSMatthew McClintockfollowing is an example of how to start a kernel and pass an updated 40700267768eSMatthew McClintockflat device tree: 40710267768eSMatthew McClintock 40720267768eSMatthew McClintock=> print oftaddr 40730267768eSMatthew McClintockoftaddr=0x300000 40740267768eSMatthew McClintock=> print oft 40750267768eSMatthew McClintockoft=oftrees/mpc8540ads.dtb 40760267768eSMatthew McClintock=> tftp $oftaddr $oft 40770267768eSMatthew McClintockSpeed: 1000, full duplex 40780267768eSMatthew McClintockUsing TSEC0 device 40790267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.101 40800267768eSMatthew McClintockFilename 'oftrees/mpc8540ads.dtb'. 40810267768eSMatthew McClintockLoad address: 0x300000 40820267768eSMatthew McClintockLoading: # 40830267768eSMatthew McClintockdone 40840267768eSMatthew McClintockBytes transferred = 4106 (100a hex) 40850267768eSMatthew McClintock=> tftp $loadaddr $bootfile 40860267768eSMatthew McClintockSpeed: 1000, full duplex 40870267768eSMatthew McClintockUsing TSEC0 device 40880267768eSMatthew McClintockTFTP from server 192.168.1.1; our IP address is 192.168.1.2 40890267768eSMatthew McClintockFilename 'uImage'. 40900267768eSMatthew McClintockLoad address: 0x200000 40910267768eSMatthew McClintockLoading:############ 40920267768eSMatthew McClintockdone 40930267768eSMatthew McClintockBytes transferred = 1029407 (fb51f hex) 40940267768eSMatthew McClintock=> print loadaddr 40950267768eSMatthew McClintockloadaddr=200000 40960267768eSMatthew McClintock=> print oftaddr 40970267768eSMatthew McClintockoftaddr=0x300000 40980267768eSMatthew McClintock=> bootm $loadaddr - $oftaddr 40990267768eSMatthew McClintock## Booting image at 00200000 ... 41000267768eSMatthew McClintock Image Name: Linux-2.6.17-dirty 41010267768eSMatthew McClintock Image Type: PowerPC Linux Kernel Image (gzip compressed) 41020267768eSMatthew McClintock Data Size: 1029343 Bytes = 1005.2 kB 41030267768eSMatthew McClintock Load Address: 00000000 41040267768eSMatthew McClintock Entry Point: 00000000 41050267768eSMatthew McClintock Verifying Checksum ... OK 41060267768eSMatthew McClintock Uncompressing Kernel Image ... OK 41070267768eSMatthew McClintockBooting using flat device tree at 0x300000 41080267768eSMatthew McClintockUsing MPC85xx ADS machine description 41090267768eSMatthew McClintockMemory CAM mapping: CAM0=256Mb, CAM1=256Mb, CAM2=0Mb residual: 0Mb 41100267768eSMatthew McClintock[snip] 41110267768eSMatthew McClintock 41120267768eSMatthew McClintock 41136069ff26SwdenkMore About U-Boot Image Types: 41146069ff26Swdenk------------------------------ 41156069ff26Swdenk 41166069ff26SwdenkU-Boot supports the following image types: 41176069ff26Swdenk 41186069ff26Swdenk "Standalone Programs" are directly runnable in the environment 41196069ff26Swdenk provided by U-Boot; it is expected that (if they behave 41206069ff26Swdenk well) you can continue to work in U-Boot after return from 41216069ff26Swdenk the Standalone Program. 41226069ff26Swdenk "OS Kernel Images" are usually images of some Embedded OS which 41236069ff26Swdenk will take over control completely. Usually these programs 41246069ff26Swdenk will install their own set of exception handlers, device 41256069ff26Swdenk drivers, set up the MMU, etc. - this means, that you cannot 41266069ff26Swdenk expect to re-enter U-Boot except by resetting the CPU. 41276069ff26Swdenk "RAMDisk Images" are more or less just data blocks, and their 41286069ff26Swdenk parameters (address, size) are passed to an OS kernel that is 41296069ff26Swdenk being started. 41306069ff26Swdenk "Multi-File Images" contain several images, typically an OS 41316069ff26Swdenk (Linux) kernel image and one or more data images like 41326069ff26Swdenk RAMDisks. This construct is useful for instance when you want 41336069ff26Swdenk to boot over the network using BOOTP etc., where the boot 41346069ff26Swdenk server provides just a single image file, but you want to get 41356069ff26Swdenk for instance an OS kernel and a RAMDisk image. 41366069ff26Swdenk 41376069ff26Swdenk "Multi-File Images" start with a list of image sizes, each 41386069ff26Swdenk image size (in bytes) specified by an "uint32_t" in network 41396069ff26Swdenk byte order. This list is terminated by an "(uint32_t)0". 41406069ff26Swdenk Immediately after the terminating 0 follow the images, one by 41416069ff26Swdenk one, all aligned on "uint32_t" boundaries (size rounded up to 41426069ff26Swdenk a multiple of 4 bytes). 41436069ff26Swdenk 41446069ff26Swdenk "Firmware Images" are binary images containing firmware (like 41456069ff26Swdenk U-Boot or FPGA images) which usually will be programmed to 41466069ff26Swdenk flash memory. 41476069ff26Swdenk 41486069ff26Swdenk "Script files" are command sequences that will be executed by 41496069ff26Swdenk U-Boot's command interpreter; this feature is especially 41506069ff26Swdenk useful when you configure U-Boot to use a real shell (hush) 41516069ff26Swdenk as command interpreter. 41526069ff26Swdenk 4153c609719bSwdenk 4154c609719bSwdenkStandalone HOWTO: 4155c609719bSwdenk================= 4156c609719bSwdenk 4157c609719bSwdenkOne of the features of U-Boot is that you can dynamically load and 4158c609719bSwdenkrun "standalone" applications, which can use some resources of 4159c609719bSwdenkU-Boot like console I/O functions or interrupt services. 4160c609719bSwdenk 4161c609719bSwdenkTwo simple examples are included with the sources: 4162c609719bSwdenk 4163c609719bSwdenk"Hello World" Demo: 4164c609719bSwdenk------------------- 4165c609719bSwdenk 4166c609719bSwdenk'examples/hello_world.c' contains a small "Hello World" Demo 4167c609719bSwdenkapplication; it is automatically compiled when you build U-Boot. 4168c609719bSwdenkIt's configured to run at address 0x00040004, so you can play with it 4169c609719bSwdenklike that: 4170c609719bSwdenk 4171c609719bSwdenk => loads 4172c609719bSwdenk ## Ready for S-Record download ... 4173c609719bSwdenk ~>examples/hello_world.srec 4174c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 4175c609719bSwdenk [file transfer complete] 4176c609719bSwdenk [connected] 4177c609719bSwdenk ## Start Addr = 0x00040004 4178c609719bSwdenk 4179c609719bSwdenk => go 40004 Hello World! This is a test. 4180c609719bSwdenk ## Starting application at 0x00040004 ... 4181c609719bSwdenk Hello World 4182c609719bSwdenk argc = 7 4183c609719bSwdenk argv[0] = "40004" 4184c609719bSwdenk argv[1] = "Hello" 4185c609719bSwdenk argv[2] = "World!" 4186c609719bSwdenk argv[3] = "This" 4187c609719bSwdenk argv[4] = "is" 4188c609719bSwdenk argv[5] = "a" 4189c609719bSwdenk argv[6] = "test." 4190c609719bSwdenk argv[7] = "<NULL>" 4191c609719bSwdenk Hit any key to exit ... 4192c609719bSwdenk 4193c609719bSwdenk ## Application terminated, rc = 0x0 4194c609719bSwdenk 4195c609719bSwdenkAnother example, which demonstrates how to register a CPM interrupt 4196c609719bSwdenkhandler with the U-Boot code, can be found in 'examples/timer.c'. 4197c609719bSwdenkHere, a CPM timer is set up to generate an interrupt every second. 4198c609719bSwdenkThe interrupt service routine is trivial, just printing a '.' 4199c609719bSwdenkcharacter, but this is just a demo program. The application can be 4200c609719bSwdenkcontrolled by the following keys: 4201c609719bSwdenk 4202c609719bSwdenk ? - print current values og the CPM Timer registers 4203c609719bSwdenk b - enable interrupts and start timer 4204c609719bSwdenk e - stop timer and disable interrupts 4205c609719bSwdenk q - quit application 4206c609719bSwdenk 4207c609719bSwdenk => loads 4208c609719bSwdenk ## Ready for S-Record download ... 4209c609719bSwdenk ~>examples/timer.srec 4210c609719bSwdenk 1 2 3 4 5 6 7 8 9 10 11 ... 4211c609719bSwdenk [file transfer complete] 4212c609719bSwdenk [connected] 4213c609719bSwdenk ## Start Addr = 0x00040004 4214c609719bSwdenk 4215c609719bSwdenk => go 40004 4216c609719bSwdenk ## Starting application at 0x00040004 ... 4217c609719bSwdenk TIMERS=0xfff00980 4218c609719bSwdenk Using timer 1 4219c609719bSwdenk tgcr @ 0xfff00980, tmr @ 0xfff00990, trr @ 0xfff00994, tcr @ 0xfff00998, tcn @ 0xfff0099c, ter @ 0xfff009b0 4220c609719bSwdenk 4221c609719bSwdenkHit 'b': 4222c609719bSwdenk [q, b, e, ?] Set interval 1000000 us 4223c609719bSwdenk Enabling timer 4224c609719bSwdenkHit '?': 4225c609719bSwdenk [q, b, e, ?] ........ 4226c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0xef6, ter=0x0 4227c609719bSwdenkHit '?': 4228c609719bSwdenk [q, b, e, ?] . 4229c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x2ad4, ter=0x0 4230c609719bSwdenkHit '?': 4231c609719bSwdenk [q, b, e, ?] . 4232c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x1efc, ter=0x0 4233c609719bSwdenkHit '?': 4234c609719bSwdenk [q, b, e, ?] . 4235c609719bSwdenk tgcr=0x1, tmr=0xff1c, trr=0x3d09, tcr=0x0, tcn=0x169d, ter=0x0 4236c609719bSwdenkHit 'e': 4237c609719bSwdenk [q, b, e, ?] ...Stopping timer 4238c609719bSwdenkHit 'q': 4239c609719bSwdenk [q, b, e, ?] ## Application terminated, rc = 0x0 4240c609719bSwdenk 4241c609719bSwdenk 424285ec0bccSwdenkMinicom warning: 424385ec0bccSwdenk================ 424485ec0bccSwdenk 42457152b1d0SwdenkOver time, many people have reported problems when trying to use the 424685ec0bccSwdenk"minicom" terminal emulation program for serial download. I (wd) 424785ec0bccSwdenkconsider minicom to be broken, and recommend not to use it. Under 4248f07771ccSwdenkUnix, I recommend to use C-Kermit for general purpose use (and 424985ec0bccSwdenkespecially for kermit binary protocol download ("loadb" command), and 425085ec0bccSwdenkuse "cu" for S-Record download ("loads" command). 425185ec0bccSwdenk 425252f52c14SwdenkNevertheless, if you absolutely want to use it try adding this 425352f52c14Swdenkconfiguration to your "File transfer protocols" section: 425452f52c14Swdenk 425552f52c14Swdenk Name Program Name U/D FullScr IO-Red. Multi 425652f52c14Swdenk X kermit /usr/bin/kermit -i -l %l -s Y U Y N N 425752f52c14Swdenk Y kermit /usr/bin/kermit -i -l %l -r N D Y N N 425852f52c14Swdenk 425952f52c14Swdenk 4260c609719bSwdenkNetBSD Notes: 4261c609719bSwdenk============= 4262c609719bSwdenk 4263c609719bSwdenkStarting at version 0.9.2, U-Boot supports NetBSD both as host 4264c609719bSwdenk(build U-Boot) and target system (boots NetBSD/mpc8xx). 4265c609719bSwdenk 4266c609719bSwdenkBuilding requires a cross environment; it is known to work on 4267c609719bSwdenkNetBSD/i386 with the cross-powerpc-netbsd-1.3 package (you will also 4268c609719bSwdenkneed gmake since the Makefiles are not compatible with BSD make). 4269c609719bSwdenkNote that the cross-powerpc package does not install include files; 4270c609719bSwdenkattempting to build U-Boot will fail because <machine/ansi.h> is 4271c609719bSwdenkmissing. This file has to be installed and patched manually: 4272c609719bSwdenk 4273c609719bSwdenk # cd /usr/pkg/cross/powerpc-netbsd/include 4274c609719bSwdenk # mkdir powerpc 4275c609719bSwdenk # ln -s powerpc machine 4276c609719bSwdenk # cp /usr/src/sys/arch/powerpc/include/ansi.h powerpc/ansi.h 4277c609719bSwdenk # ${EDIT} powerpc/ansi.h ## must remove __va_list, _BSD_VA_LIST 4278c609719bSwdenk 4279c609719bSwdenkNative builds *don't* work due to incompatibilities between native 4280c609719bSwdenkand U-Boot include files. 4281c609719bSwdenk 4282c609719bSwdenkBooting assumes that (the first part of) the image booted is a 4283c609719bSwdenkstage-2 loader which in turn loads and then invokes the kernel 4284c609719bSwdenkproper. Loader sources will eventually appear in the NetBSD source 4285c609719bSwdenktree (probably in sys/arc/mpc8xx/stand/u-boot_stage2/); in the 42862a8af187Swdenkmeantime, see ftp://ftp.denx.de/pub/u-boot/ppcboot_stage2.tar.gz 4287c609719bSwdenk 4288c609719bSwdenk 4289c609719bSwdenkImplementation Internals: 4290c609719bSwdenk========================= 4291c609719bSwdenk 4292c609719bSwdenkThe following is not intended to be a complete description of every 4293c609719bSwdenkimplementation detail. However, it should help to understand the 4294c609719bSwdenkinner workings of U-Boot and make it easier to port it to custom 4295c609719bSwdenkhardware. 4296c609719bSwdenk 4297c609719bSwdenk 4298c609719bSwdenkInitial Stack, Global Data: 4299c609719bSwdenk--------------------------- 4300c609719bSwdenk 4301c609719bSwdenkThe implementation of U-Boot is complicated by the fact that U-Boot 4302c609719bSwdenkstarts running out of ROM (flash memory), usually without access to 4303c609719bSwdenksystem RAM (because the memory controller is not initialized yet). 4304c609719bSwdenkThis means that we don't have writable Data or BSS segments, and BSS 4305c609719bSwdenkis not initialized as zero. To be able to get a C environment working 4306c609719bSwdenkat all, we have to allocate at least a minimal stack. Implementation 4307c609719bSwdenkoptions for this are defined and restricted by the CPU used: Some CPU 4308c609719bSwdenkmodels provide on-chip memory (like the IMMR area on MPC8xx and 4309c609719bSwdenkMPC826x processors), on others (parts of) the data cache can be 4310c609719bSwdenklocked as (mis-) used as memory, etc. 4311c609719bSwdenk 43127152b1d0Swdenk Chris Hallinan posted a good summary of these issues to the 43130668236bSWolfgang Denk U-Boot mailing list: 431443d9616cSwdenk 431543d9616cSwdenk Subject: RE: [U-Boot-Users] RE: More On Memory Bank x (nothingness)? 431643d9616cSwdenk From: "Chris Hallinan" <clh@net1plus.com> 431743d9616cSwdenk Date: Mon, 10 Feb 2003 16:43:46 -0500 (22:43 MET) 431843d9616cSwdenk ... 431943d9616cSwdenk 432043d9616cSwdenk Correct me if I'm wrong, folks, but the way I understand it 432143d9616cSwdenk is this: Using DCACHE as initial RAM for Stack, etc, does not 432243d9616cSwdenk require any physical RAM backing up the cache. The cleverness 432343d9616cSwdenk is that the cache is being used as a temporary supply of 432443d9616cSwdenk necessary storage before the SDRAM controller is setup. It's 432511ccc33fSMarcel Ziswiler beyond the scope of this list to explain the details, but you 432643d9616cSwdenk can see how this works by studying the cache architecture and 432743d9616cSwdenk operation in the architecture and processor-specific manuals. 432843d9616cSwdenk 432943d9616cSwdenk OCM is On Chip Memory, which I believe the 405GP has 4K. It 433043d9616cSwdenk is another option for the system designer to use as an 433111ccc33fSMarcel Ziswiler initial stack/RAM area prior to SDRAM being available. Either 433243d9616cSwdenk option should work for you. Using CS 4 should be fine if your 433343d9616cSwdenk board designers haven't used it for something that would 433443d9616cSwdenk cause you grief during the initial boot! It is frequently not 433543d9616cSwdenk used. 433643d9616cSwdenk 43376d0f6bcfSJean-Christophe PLAGNIOL-VILLARD CONFIG_SYS_INIT_RAM_ADDR should be somewhere that won't interfere 433843d9616cSwdenk with your processor/board/system design. The default value 433943d9616cSwdenk you will find in any recent u-boot distribution in 43408a316c9bSStefan Roese walnut.h should work for you. I'd set it to a value larger 434143d9616cSwdenk than your SDRAM module. If you have a 64MB SDRAM module, set 434243d9616cSwdenk it above 400_0000. Just make sure your board has no resources 434343d9616cSwdenk that are supposed to respond to that address! That code in 434443d9616cSwdenk start.S has been around a while and should work as is when 434543d9616cSwdenk you get the config right. 434643d9616cSwdenk 434743d9616cSwdenk -Chris Hallinan 434843d9616cSwdenk DS4.COM, Inc. 434943d9616cSwdenk 4350c609719bSwdenkIt is essential to remember this, since it has some impact on the C 4351c609719bSwdenkcode for the initialization procedures: 4352c609719bSwdenk 4353c609719bSwdenk* Initialized global data (data segment) is read-only. Do not attempt 4354c609719bSwdenk to write it. 4355c609719bSwdenk 435611ccc33fSMarcel Ziswiler* Do not use any uninitialized global data (or implicitely initialized 4357c609719bSwdenk as zero data - BSS segment) at all - this is undefined, initiali- 43587152b1d0Swdenk zation is performed later (when relocating to RAM). 4359c609719bSwdenk 4360c609719bSwdenk* Stack space is very limited. Avoid big data buffers or things like 4361c609719bSwdenk that. 4362c609719bSwdenk 4363c609719bSwdenkHaving only the stack as writable memory limits means we cannot use 4364c609719bSwdenknormal global data to share information beween the code. But it 4365c609719bSwdenkturned out that the implementation of U-Boot can be greatly 4366c609719bSwdenksimplified by making a global data structure (gd_t) available to all 4367c609719bSwdenkfunctions. We could pass a pointer to this data as argument to _all_ 4368c609719bSwdenkfunctions, but this would bloat the code. Instead we use a feature of 4369c609719bSwdenkthe GCC compiler (Global Register Variables) to share the data: we 4370c609719bSwdenkplace a pointer (gd) to the global data into a register which we 4371c609719bSwdenkreserve for this purpose. 4372c609719bSwdenk 43737152b1d0SwdenkWhen choosing a register for such a purpose we are restricted by the 4374c609719bSwdenkrelevant (E)ABI specifications for the current architecture, and by 4375c609719bSwdenkGCC's implementation. 4376c609719bSwdenk 4377c609719bSwdenkFor PowerPC, the following registers have specific use: 4378c609719bSwdenk R1: stack pointer 4379e7670f6cSWolfgang Denk R2: reserved for system use 4380c609719bSwdenk R3-R4: parameter passing and return values 4381c609719bSwdenk R5-R10: parameter passing 4382c609719bSwdenk R13: small data area pointer 4383c609719bSwdenk R30: GOT pointer 4384c609719bSwdenk R31: frame pointer 4385c609719bSwdenk 4386e6bee808SJoakim Tjernlund (U-Boot also uses R12 as internal GOT pointer. r12 4387e6bee808SJoakim Tjernlund is a volatile register so r12 needs to be reset when 4388e6bee808SJoakim Tjernlund going back and forth between asm and C) 4389c609719bSwdenk 4390e7670f6cSWolfgang Denk ==> U-Boot will use R2 to hold a pointer to the global data 4391c609719bSwdenk 4392c609719bSwdenk Note: on PPC, we could use a static initializer (since the 4393c609719bSwdenk address of the global data structure is known at compile time), 4394c609719bSwdenk but it turned out that reserving a register results in somewhat 4395c609719bSwdenk smaller code - although the code savings are not that big (on 4396c609719bSwdenk average for all boards 752 bytes for the whole U-Boot image, 4397c609719bSwdenk 624 text + 127 data). 4398c609719bSwdenk 4399c4db335cSRobin GetzOn Blackfin, the normal C ABI (except for P3) is followed as documented here: 44004c58eb55SMike Frysinger http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface 44014c58eb55SMike Frysinger 4402c4db335cSRobin Getz ==> U-Boot will use P3 to hold a pointer to the global data 44034c58eb55SMike Frysinger 4404c609719bSwdenkOn ARM, the following registers are used: 4405c609719bSwdenk 4406c609719bSwdenk R0: function argument word/integer result 4407c609719bSwdenk R1-R3: function argument word 4408c609719bSwdenk R9: GOT pointer 4409c609719bSwdenk R10: stack limit (used only if stack checking if enabled) 4410c609719bSwdenk R11: argument (frame) pointer 4411c609719bSwdenk R12: temporary workspace 4412c609719bSwdenk R13: stack pointer 4413c609719bSwdenk R14: link register 4414c609719bSwdenk R15: program counter 4415c609719bSwdenk 4416c609719bSwdenk ==> U-Boot will use R8 to hold a pointer to the global data 4417c609719bSwdenk 44180df01fd3SThomas ChouOn Nios II, the ABI is documented here: 44190df01fd3SThomas Chou http://www.altera.com/literature/hb/nios2/n2cpu_nii51016.pdf 44200df01fd3SThomas Chou 44210df01fd3SThomas Chou ==> U-Boot will use gp to hold a pointer to the global data 44220df01fd3SThomas Chou 44230df01fd3SThomas Chou Note: on Nios II, we give "-G0" option to gcc and don't use gp 44240df01fd3SThomas Chou to access small data sections, so gp is free. 44250df01fd3SThomas Chou 4426afc1ce82SMacpaul LinOn NDS32, the following registers are used: 4427afc1ce82SMacpaul Lin 4428afc1ce82SMacpaul Lin R0-R1: argument/return 4429afc1ce82SMacpaul Lin R2-R5: argument 4430afc1ce82SMacpaul Lin R15: temporary register for assembler 4431afc1ce82SMacpaul Lin R16: trampoline register 4432afc1ce82SMacpaul Lin R28: frame pointer (FP) 4433afc1ce82SMacpaul Lin R29: global pointer (GP) 4434afc1ce82SMacpaul Lin R30: link register (LP) 4435afc1ce82SMacpaul Lin R31: stack pointer (SP) 4436afc1ce82SMacpaul Lin PC: program counter (PC) 4437afc1ce82SMacpaul Lin 4438afc1ce82SMacpaul Lin ==> U-Boot will use R10 to hold a pointer to the global data 4439afc1ce82SMacpaul Lin 4440d87080b7SWolfgang DenkNOTE: DECLARE_GLOBAL_DATA_PTR must be used with file-global scope, 4441d87080b7SWolfgang Denkor current versions of GCC may "optimize" the code too much. 4442c609719bSwdenk 4443c609719bSwdenkMemory Management: 4444c609719bSwdenk------------------ 4445c609719bSwdenk 4446c609719bSwdenkU-Boot runs in system state and uses physical addresses, i.e. the 4447c609719bSwdenkMMU is not used either for address mapping nor for memory protection. 4448c609719bSwdenk 4449c609719bSwdenkThe available memory is mapped to fixed addresses using the memory 4450c609719bSwdenkcontroller. In this process, a contiguous block is formed for each 4451c609719bSwdenkmemory type (Flash, SDRAM, SRAM), even when it consists of several 4452c609719bSwdenkphysical memory banks. 4453c609719bSwdenk 4454c609719bSwdenkU-Boot is installed in the first 128 kB of the first Flash bank (on 4455c609719bSwdenkTQM8xxL modules this is the range 0x40000000 ... 0x4001FFFF). After 4456c609719bSwdenkbooting and sizing and initializing DRAM, the code relocates itself 4457c609719bSwdenkto the upper end of DRAM. Immediately below the U-Boot code some 44586d0f6bcfSJean-Christophe PLAGNIOL-VILLARDmemory is reserved for use by malloc() [see CONFIG_SYS_MALLOC_LEN 4459c609719bSwdenkconfiguration setting]. Below that, a structure with global Board 4460c609719bSwdenkInfo data is placed, followed by the stack (growing downward). 4461c609719bSwdenk 4462c609719bSwdenkAdditionally, some exception handler code is copied to the low 8 kB 4463c609719bSwdenkof DRAM (0x00000000 ... 0x00001FFF). 4464c609719bSwdenk 4465c609719bSwdenkSo a typical memory configuration with 16 MB of DRAM could look like 4466c609719bSwdenkthis: 4467c609719bSwdenk 4468c609719bSwdenk 0x0000 0000 Exception Vector code 4469c609719bSwdenk : 4470c609719bSwdenk 0x0000 1FFF 4471c609719bSwdenk 0x0000 2000 Free for Application Use 4472c609719bSwdenk : 4473c609719bSwdenk : 4474c609719bSwdenk 4475c609719bSwdenk : 4476c609719bSwdenk : 4477c609719bSwdenk 0x00FB FF20 Monitor Stack (Growing downward) 4478c609719bSwdenk 0x00FB FFAC Board Info Data and permanent copy of global data 4479c609719bSwdenk 0x00FC 0000 Malloc Arena 4480c609719bSwdenk : 4481c609719bSwdenk 0x00FD FFFF 4482c609719bSwdenk 0x00FE 0000 RAM Copy of Monitor Code 4483c609719bSwdenk ... eventually: LCD or video framebuffer 4484c609719bSwdenk ... eventually: pRAM (Protected RAM - unchanged by reset) 4485c609719bSwdenk 0x00FF FFFF [End of RAM] 4486c609719bSwdenk 4487c609719bSwdenk 4488c609719bSwdenkSystem Initialization: 4489c609719bSwdenk---------------------- 4490c609719bSwdenk 4491c609719bSwdenkIn the reset configuration, U-Boot starts at the reset entry point 449211ccc33fSMarcel Ziswiler(on most PowerPC systems at address 0x00000100). Because of the reset 4493c609719bSwdenkconfiguration for CS0# this is a mirror of the onboard Flash memory. 44947152b1d0SwdenkTo be able to re-map memory U-Boot then jumps to its link address. 4495c609719bSwdenkTo be able to implement the initialization code in C, a (small!) 4496c609719bSwdenkinitial stack is set up in the internal Dual Ported RAM (in case CPUs 4497c609719bSwdenkwhich provide such a feature like MPC8xx or MPC8260), or in a locked 4498c609719bSwdenkpart of the data cache. After that, U-Boot initializes the CPU core, 4499c609719bSwdenkthe caches and the SIU. 4500c609719bSwdenk 4501c609719bSwdenkNext, all (potentially) available memory banks are mapped using a 4502c609719bSwdenkpreliminary mapping. For example, we put them on 512 MB boundaries 4503c609719bSwdenk(multiples of 0x20000000: SDRAM on 0x00000000 and 0x20000000, Flash 4504c609719bSwdenkon 0x40000000 and 0x60000000, SRAM on 0x80000000). Then UPM A is 4505c609719bSwdenkprogrammed for SDRAM access. Using the temporary configuration, a 4506c609719bSwdenksimple memory test is run that determines the size of the SDRAM 4507c609719bSwdenkbanks. 4508c609719bSwdenk 4509c609719bSwdenkWhen there is more than one SDRAM bank, and the banks are of 45107152b1d0Swdenkdifferent size, the largest is mapped first. For equal size, the first 4511c609719bSwdenkbank (CS2#) is mapped first. The first mapping is always for address 4512c609719bSwdenk0x00000000, with any additional banks following immediately to create 4513c609719bSwdenkcontiguous memory starting from 0. 4514c609719bSwdenk 4515c609719bSwdenkThen, the monitor installs itself at the upper end of the SDRAM area 4516c609719bSwdenkand allocates memory for use by malloc() and for the global Board 4517c609719bSwdenkInfo data; also, the exception vector code is copied to the low RAM 4518c609719bSwdenkpages, and the final stack is set up. 4519c609719bSwdenk 4520c609719bSwdenkOnly after this relocation will you have a "normal" C environment; 4521c609719bSwdenkuntil that you are restricted in several ways, mostly because you are 4522c609719bSwdenkrunning from ROM, and because the code will have to be relocated to a 4523c609719bSwdenknew address in RAM. 4524c609719bSwdenk 4525c609719bSwdenk 4526c609719bSwdenkU-Boot Porting Guide: 4527c609719bSwdenk---------------------- 4528c609719bSwdenk 4529c609719bSwdenk[Based on messages by Jerry Van Baren in the U-Boot-Users mailing 45306aff3115Swdenklist, October 2002] 4531c609719bSwdenk 4532c609719bSwdenk 4533c609719bSwdenkint main(int argc, char *argv[]) 4534c609719bSwdenk{ 4535c609719bSwdenk sighandler_t no_more_time; 4536c609719bSwdenk 4537c609719bSwdenk signal(SIGALRM, no_more_time); 4538c609719bSwdenk alarm(PROJECT_DEADLINE - toSec (3 * WEEK)); 4539c609719bSwdenk 4540c609719bSwdenk if (available_money > available_manpower) { 45416c3fef28SJerry Van Baren Pay consultant to port U-Boot; 4542c609719bSwdenk return 0; 4543c609719bSwdenk } 4544c609719bSwdenk 4545c609719bSwdenk Download latest U-Boot source; 4546c609719bSwdenk 45470668236bSWolfgang Denk Subscribe to u-boot mailing list; 45486aff3115Swdenk 45496c3fef28SJerry Van Baren if (clueless) 4550c609719bSwdenk email("Hi, I am new to U-Boot, how do I get started?"); 4551c609719bSwdenk 4552c609719bSwdenk while (learning) { 4553c609719bSwdenk Read the README file in the top level directory; 45547cb22f97Swdenk Read http://www.denx.de/twiki/bin/view/DULG/Manual; 45556c3fef28SJerry Van Baren Read applicable doc/*.README; 4556c609719bSwdenk Read the source, Luke; 45576c3fef28SJerry Van Baren /* find . -name "*.[chS]" | xargs grep -i <keyword> */ 4558c609719bSwdenk } 4559c609719bSwdenk 45606c3fef28SJerry Van Baren if (available_money > toLocalCurrency ($2500)) 45616c3fef28SJerry Van Baren Buy a BDI3000; 45626c3fef28SJerry Van Baren else 4563c609719bSwdenk Add a lot of aggravation and time; 4564c609719bSwdenk 45656c3fef28SJerry Van Baren if (a similar board exists) { /* hopefully... */ 45666c3fef28SJerry Van Baren cp -a board/<similar> board/<myboard> 45676c3fef28SJerry Van Baren cp include/configs/<similar>.h include/configs/<myboard>.h 45686c3fef28SJerry Van Baren } else { 4569c609719bSwdenk Create your own board support subdirectory; 45706c3fef28SJerry Van Baren Create your own board include/configs/<myboard>.h file; 45716c3fef28SJerry Van Baren } 45726c3fef28SJerry Van Baren Edit new board/<myboard> files 45736c3fef28SJerry Van Baren Edit new include/configs/<myboard>.h 4574c609719bSwdenk 45756c3fef28SJerry Van Baren while (!accepted) { 4576c609719bSwdenk while (!running) { 4577c609719bSwdenk do { 4578c609719bSwdenk Add / modify source code; 4579c609719bSwdenk } until (compiles); 4580c609719bSwdenk Debug; 4581c609719bSwdenk if (clueless) 4582c609719bSwdenk email("Hi, I am having problems..."); 4583c609719bSwdenk } 45846c3fef28SJerry Van Baren Send patch file to the U-Boot email list; 45856c3fef28SJerry Van Baren if (reasonable critiques) 45866c3fef28SJerry Van Baren Incorporate improvements from email list code review; 45876c3fef28SJerry Van Baren else 45886c3fef28SJerry Van Baren Defend code as written; 45896c3fef28SJerry Van Baren } 4590c609719bSwdenk 4591c609719bSwdenk return 0; 4592c609719bSwdenk} 4593c609719bSwdenk 4594c609719bSwdenkvoid no_more_time (int sig) 4595c609719bSwdenk{ 4596c609719bSwdenk hire_a_guru(); 4597c609719bSwdenk} 4598c609719bSwdenk 4599c609719bSwdenk 4600c609719bSwdenkCoding Standards: 4601c609719bSwdenk----------------- 4602c609719bSwdenk 4603c609719bSwdenkAll contributions to U-Boot should conform to the Linux kernel 46042c051651SDetlev Zundelcoding style; see the file "Documentation/CodingStyle" and the script 46057ca9296eSWolfgang Denk"scripts/Lindent" in your Linux kernel source directory. 4606c609719bSwdenk 46072c051651SDetlev ZundelSource files originating from a different project (for example the 46082c051651SDetlev ZundelMTD subsystem) are generally exempt from these guidelines and are not 46092c051651SDetlev Zundelreformated to ease subsequent migration to newer versions of those 46102c051651SDetlev Zundelsources. 46112c051651SDetlev Zundel 46122c051651SDetlev ZundelPlease note that U-Boot is implemented in C (and to some small parts in 46132c051651SDetlev ZundelAssembler); no C++ is used, so please do not use C++ style comments (//) 46142c051651SDetlev Zundelin your code. 4615c609719bSwdenk 4616c178d3daSwdenkPlease also stick to the following formatting rules: 4617180d3f74Swdenk- remove any trailing white space 46187ca9296eSWolfgang Denk- use TAB characters for indentation and vertical alignment, not spaces 4619180d3f74Swdenk- make sure NOT to use DOS '\r\n' line feeds 46207ca9296eSWolfgang Denk- do not add more than 2 consecutive empty lines to source files 4621180d3f74Swdenk- do not add trailing empty lines to source files 4622180d3f74Swdenk 4623c609719bSwdenkSubmissions which do not conform to the standards may be returned 4624c609719bSwdenkwith a request to reformat the changes. 4625c609719bSwdenk 4626c609719bSwdenk 4627c609719bSwdenkSubmitting Patches: 4628c609719bSwdenk------------------- 4629c609719bSwdenk 4630c609719bSwdenkSince the number of patches for U-Boot is growing, we need to 4631c609719bSwdenkestablish some rules. Submissions which do not conform to these rules 4632c609719bSwdenkmay be rejected, even when they contain important and valuable stuff. 4633c609719bSwdenk 46340d28f34bSMagnus LiljaPlease see http://www.denx.de/wiki/U-Boot/Patches for details. 4635218ca724SWolfgang Denk 46360668236bSWolfgang DenkPatches shall be sent to the u-boot mailing list <u-boot@lists.denx.de>; 46370668236bSWolfgang Denksee http://lists.denx.de/mailman/listinfo/u-boot 46380668236bSWolfgang Denk 4639c609719bSwdenkWhen you send a patch, please include the following information with 4640c609719bSwdenkit: 4641c609719bSwdenk 4642c609719bSwdenk* For bug fixes: a description of the bug and how your patch fixes 4643c609719bSwdenk this bug. Please try to include a way of demonstrating that the 4644c609719bSwdenk patch actually fixes something. 4645c609719bSwdenk 4646c609719bSwdenk* For new features: a description of the feature and your 4647c609719bSwdenk implementation. 4648c609719bSwdenk 4649c609719bSwdenk* A CHANGELOG entry as plaintext (separate from the patch) 4650c609719bSwdenk 4651c609719bSwdenk* For major contributions, your entry to the CREDITS file 4652c609719bSwdenk 4653c609719bSwdenk* When you add support for a new board, don't forget to add this 46547ca9296eSWolfgang Denk board to the MAINTAINERS file, too. 4655c609719bSwdenk 4656c609719bSwdenk* If your patch adds new configuration options, don't forget to 4657c609719bSwdenk document these in the README file. 4658c609719bSwdenk 4659218ca724SWolfgang Denk* The patch itself. If you are using git (which is *strongly* 4660218ca724SWolfgang Denk recommended) you can easily generate the patch using the 46617ca9296eSWolfgang Denk "git format-patch". If you then use "git send-email" to send it to 4662218ca724SWolfgang Denk the U-Boot mailing list, you will avoid most of the common problems 4663218ca724SWolfgang Denk with some other mail clients. 4664c609719bSwdenk 4665218ca724SWolfgang Denk If you cannot use git, use "diff -purN OLD NEW". If your version of 4666218ca724SWolfgang Denk diff does not support these options, then get the latest version of 4667218ca724SWolfgang Denk GNU diff. 46686dff5529Swdenk 4669218ca724SWolfgang Denk The current directory when running this command shall be the parent 4670218ca724SWolfgang Denk directory of the U-Boot source tree (i. e. please make sure that 4671218ca724SWolfgang Denk your patch includes sufficient directory information for the 4672218ca724SWolfgang Denk affected files). 4673218ca724SWolfgang Denk 4674218ca724SWolfgang Denk We prefer patches as plain text. MIME attachments are discouraged, 4675218ca724SWolfgang Denk and compressed attachments must not be used. 4676c609719bSwdenk 467752f52c14Swdenk* If one logical set of modifications affects or creates several 467852f52c14Swdenk files, all these changes shall be submitted in a SINGLE patch file. 467952f52c14Swdenk 468052f52c14Swdenk* Changesets that contain different, unrelated modifications shall be 468152f52c14Swdenk submitted as SEPARATE patches, one patch per changeset. 468252f52c14Swdenk 468352f52c14Swdenk 4684c609719bSwdenkNotes: 4685c609719bSwdenk 4686c609719bSwdenk* Before sending the patch, run the MAKEALL script on your patched 4687c609719bSwdenk source tree and make sure that no errors or warnings are reported 4688c609719bSwdenk for any of the boards. 4689c609719bSwdenk 4690c609719bSwdenk* Keep your modifications to the necessary minimum: A patch 4691c609719bSwdenk containing several unrelated changes or arbitrary reformats will be 4692c609719bSwdenk returned with a request to re-formatting / split it. 4693c609719bSwdenk 4694c609719bSwdenk* If you modify existing code, make sure that your new code does not 4695c609719bSwdenk add to the memory footprint of the code ;-) Small is beautiful! 4696c609719bSwdenk When adding new features, these should compile conditionally only 4697c609719bSwdenk (using #ifdef), and the resulting code with the new feature 4698c609719bSwdenk disabled must not need more memory than the old code without your 4699c609719bSwdenk modification. 470090dc6704Swdenk 47010668236bSWolfgang Denk* Remember that there is a size limit of 100 kB per message on the 47020668236bSWolfgang Denk u-boot mailing list. Bigger patches will be moderated. If they are 47030668236bSWolfgang Denk reasonable and not too big, they will be acknowledged. But patches 47040668236bSWolfgang Denk bigger than the size limit should be avoided. 4705