How to compile u-Boot

This article illustrates how to compile u-boot for the FOX Board G20 and how to patch it to boot the kernel from microSD.

Many thanks to Stefano Barbato (http://www.codesink.org) for this patch.

Download the Linux version of Sourcery G++ Lite 2008q3-66 for ARM EABI toolchain from this link:

• http://www.codesourcery.com/sgpp/lite/arm/portal/release642

Set the arm-2008q3-66-arm-none-eabi.bin executable and execute to install Sourcery G++ toochain:

$ chmod +x arm-2008q3-66-arm-none-eabi.bin 
$ ./arm-2008q3-66-arm-none-eabi.bin

The installation will start:

Select the typical version and confirm the default value during the installation.

Download the u-boot version 2009.08 from this link:

• http://ftp.denx.de/pub/u-boot/u-boot-2009.08.tar.bz2

Untar the u-boot-2009.08.tar.bz2:

$ tar xjvf u-boot-2009.08.tar.bz2

Go into the new u-boot-2009.08 directory and copy foxg20-20091222.patch inside it then type:

$ patch -p1 < foxg20-20091222.patch

Set this two environment variables:

$ export ARCH=arm
$ export CROSS_COMPILE=/<your home directory>/CodeSourcery/Sourcery_G++_Lite/bin/arm-none-eabi-

Then run the cross compilation:

$ make at91sam9g20ek_dataflash_cs1_config
$ make

After a while you will obtain this file:

• http://foxg20.acmesystems.it/download/u-boot.bin

Ready to insert on the FOX Board G20 dataflash.