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Panda How to Barebox

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Introduction

For this How-to, we will use the Code Sourcery G++ version arm-2009q3. It should already be installed on your system. MLO, u-boot and kernels have also been successfully built with arm-2010q1.

What is Barebox?

Barebox is what was once u-boot V2, see the homepage for more details.

http://barebox.org/

You can get the sources from: http://git.pengutronix.de/?p=barebox.git;a=summary


Warning

There is no 4460 specific code as yet in Barebox and the 4430 code that sets up the CPU dpll and the VCORE1/3 is not correct for the 4460.


MLO

First, let's get the x-loader source code and build it. But the difference with Barebox is that the x-loader is just a down size of Barebox it self

git clone git://git.pengutronix.de/git/barebox.git

Next, select the panda config:

mkdir MLO
make mrproper
make ARCH=arm CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi-  O=MLO panda_xload_defconfig

Now compile MLO:

make ARCH=arm CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- O=MLO

This should produce the MLO file as MLO/barebox.bin.

Barebox

Now for Barebox:

Next, select the panda config:

mkdir boot
make ARCH=arm CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- O=boot panda_defconfig

Now compile Barebox:

make ARCH=arm CROSS_COMPILE=Path_to_your/arm-2009q3/bin/arm-none-linux-gnueabi- O=boot

This should produce boot/barebox.bin

Creating a working SD card

Use this script to prepare an SD card with the small vfat partition and the larger ext2/3 partition (it has been posted many places, I take no credit for it btw, the card needs to be larger than 64Mbytes since this original script wants to make a 64Mbyte vfat partition) You may need to be root for some of the following operations. For the feint of heart, you can use sudo instead in the right places.

#!/bin/sh
if [ ! "$1" = "/dev/sda" ] ; then
	DRIVE=$1
	if [ -b "$DRIVE" ] ; then
		dd if=/dev/zero of=$DRIVE bs=1024 count=1024
		SIZE=`fdisk -l $DRIVE | grep Disk | awk '{print $5}'`
		echo DISK SIZE - $SIZE bytes
		CYLINDERS=`echo $SIZE/255/63/512 | bc`
		echo CYLINDERS - $CYLINDERS
		{
		echo ,9,0x0C,*
		echo ,,,-
		} | sfdisk -D -H 255 -S 63 -C $CYLINDERS $DRIVE
		mkfs.vfat -F 32 -n "boot" ${DRIVE}1
		mke2fs -j -L "rootfs" ${DRIVE}2
	fi 
fi

When SD card partitioning is ready you need to copy binaries to SD card boot partition.

Copy first MLO:

cp MLO/barebox.bin.itf /media/boot/MLO

Then copy barebox:

cp boot/barebox.bin /media/boot/

Then you're ready. Plug your SD card to Pandaboard and enjoy barebox.

More to come....