From f53a437e4ec287780fda14ea8de48c212f04872f Mon Sep 17 00:00:00 2001 From: Ulf Samuelsson Date: Tue, 6 Jan 2009 16:30:32 +0000 Subject: Add documentation for u-boot patches to 2009.01-rc1 --- docs/U-boot.html | 255 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 255 insertions(+) create mode 100644 docs/U-boot.html (limited to 'docs') diff --git a/docs/U-boot.html b/docs/U-boot.html new file mode 100644 index 000000000..0ab2a76b1 --- /dev/null +++ b/docs/U-boot.html @@ -0,0 +1,255 @@ + + + + + + Buildroot - U-boot extensions in 2009.01-rc1 + + + + + +
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+ +

U-boot extensions in 2009.01-rc1

+
+ +

U-Boot + usage and documentation by Ulf Samuelsson. +

+ +

$LastChangedDate: 2008-12-16 10:00:11 +0100 (tis, 16 dec 2008) $

+ +

About U-boot

+ [TOP] + +

+ U-Boot is an open source bootloader ported to a multitude of processors. + See (U-Boot Home) + for documentation for vanilla U-Boot. This document only describes + changes compared to the vanilla u-boot. +

+ +

Board support for at91rm9200dk

+ [TOP] + +

+ "at91rm9200dk" is updated to use a linux like API for gpio. + A new target "at91rm9200dk_df" is defined to support boot from dataflash. +

+ +

Board support for at91rm9200ek

+ [TOP] + +

+ The "at91rm9200ek" BSP supports booting from a parallel flash. + The "at91rm9200df" BSP supports a generic target booting from dataflash. +

+ +

Board support for at91sam9g20ek

+ [TOP] + +

+ The "at91sam9g20ek" target with dataflash(card) and NAND boot support. +

+ +

Minicom extensions

+ [TOP] + +

+ "sx-at91" is a reliable X-Modem application allowing download to the at91rm9200 + based board +

+

+ "raw-at91" is a download application which will download binary data using minicom. + Typically used to download an environment script. +

+ +

New command: factory

+ [TOP] + +

+

factory

+

+ +

+ "factory" will set a selected set of environment variables + back to the compile time default. The following will give some + hints on capabilities, but is not yet complete. +

+ +

+ It will generate a set of scripts which will facilitate downloading + the kernel and root file system using tftp and will also + add commands to store into and retrieve from flash +

+ +

New command: os

+ [TOP] + +

+

os

+

+

+ "os" computes a new name for the linux kernel +

+ +

New command: fs

+ [TOP] + +

+

fs

+

+

+ "fs" computes a new name for the file system +

+ +

New command: setargs

+ [TOP] +

+

setargs

+

+

+ "setargs" will create new bootcmd/bootargs combination from + kernel name, filesystem name, and rootfs type. +

+ +

New command: led

+ [TOP] + +

+

led [green | yellow | red | all ] [ on | off ]

+

+ +

+ "led" will turn on or off the specified (coloured) led +

+ +

New command: mux

+ [TOP] + +

+

mux [spi | mmc ]

+

+ +

+ "mux" will select how to use the flash card connector on the + at91rm9200dk or at91rm9200ek +

+ +

New command: ethinit

+ [TOP] + +

+

ethinit

+

+ +

+ "ethinit" can be used to delay the boot of linux, until a valid network + connection has been established. This is useful if the machine is NFS mounting + the root file system and both this machine and the NFS server are powering up + simultaneously. The NFS server could take a lot longer to boot, and waiting + for this to boot may be neccessary for proper operation. +

+ +

Special environment variables

+ [TOP] + +

+

rd

+

+

+ rd contains the name of the current root file system + It is autmatically generated from ver and rd-1, rd-2 etc. + The "fs-date" is added at the end. +

+ +

+

ver

+

+

+ You can handle a number of different root fs by defining ver. + When running fs rd will be assigned from one of: +

    rd-1, rd2, rd-3 ...
+

+

+ By defining ver to a number you will + select the appropriate disk name +

+ +

+

fs-date

+

+

+ "date" part of the root file system name +

+ +

+

linux

+

+

+ linux contains the name of the current kernel. +

+

+ It is generated from several environment variables when os is run +

+

+ A typical name would be "at91sam9263ek-linux-2.6.28-20090105.gz" +

+ +

+

hostname

+

+

+ "name" part of the kernel file name +

+ +

+

kernel-version

+

+

+ "version" part of the kernel file name +

+ +

+

kernel-date

+

+

+ "date" part of the kernel file name +

+ +

+

fstype [ ram | flash ]

+

+ You can have several file system types. + bootargs is created depending on fstype.. +

+ + [TOP] + +
+ + + + -- cgit v1.2.3