PandaBoard ES uboot howto

Getting the Source
To get the source code for U-Boot, clone a copy of the Linaro U-Boot stable tree:

mkdir pandaboard-es cd pandaboard-es git clone git://git.linaro.org/boot/u-boot-linaro-stable.git cd u-boot-linaro-stable git checkout -b pandaboard-es origin/Linaro-u-boot-2011.12

As of 12/18/2011, the master branch tagged Linaro-u-boot-2011.12 produces a working MLO/U-Boot pair which will boot both Panda and Panda-ES boards. Previously, the Panda EA1 with rev ES2.0 silicon would not boot.

Configure and Compile
To configure and compile U-Boot for PandaBoard ES do the following:

export CROSS_COMPILE=arm-none-linux-gnueabi- make omap4_panda_config make

Note: This assumes that you are using and have installed the CodeSourcery 2011.03-41 for ARM GNU/Linux toolchain. If you are using a different toolchain, make sure to adjust the CROSS_COMPILE variable accordingly.

Using "Sourcery CodeBench Lite 2011.09-70 for ARM GNU/Linux" generates a compiler error, as does using the toolchain that comes with Ubuntu's gcc-arm-linux-gnueabi package as follows:

... snip ... arm-linux-gnueabi-gcc -g  -Os   -fno-common -ffixed-r8 -msoft-float  -D__KERNEL__ -DCONFIG_SYS_TEXT_BASE=0x80E80000 -DCONFIG_SPL_TEXT_BASE=0x40303080 -I/home/rpjday/panda/uboot/u-boot-linaro-stable/include -fno-builtin -ffreestanding -nostdinc -isystem /usr/lib/gcc/arm-linux-gnueabi/4.6.1/include -pipe -DCONFIG_ARM -D__ARM__ -marm -mabi=aapcs-linux -mno-thumb-interwork -march=armv5 -Wall -Wstrict-prototypes -fno-stack-protector -Wno-format-nonliteral -Wno-format-security -o clocks.o clocks.c -c clocks.c: In function ‘enable_non_essential_clocks’: clocks.c:420:13: internal compiler error: in decode_addr_const, at varasm.c:2638 Please submit a full bug report, with preprocessed source if appropriate. See  for instructions. Preprocessed source stored into /tmp/ccE2XxKg.out file, please attach this to your bugreport.

At the present time, this seems to be a problem with gcc 4.6.1.

GNU gcc 4.6.2 appears to have a fix for this issue. Stay tuned for a How-to on how to build a gcc 4.6.x toolchain that will properly compile u-boot.

Copy Files
Copy the MLO and U-Boot images to the boot partition of your mounted SD card:

cp MLO /media/boot cp u-boot.img /media/boot sync

Make sure you unmount your SD card prior to removing it from the host PC.