Building U-Boot

Note: this stub is to help with the LEON3 Qemu tutorial. The following instructions built the image and were run on a Debian Sqeeze host.

Download the latest release of the ​universal boot loader from ​the ftp or, you can check out the developer branch using git.

$ git clone ​git://git.denx.de/u-boot.git $ cd u-boot

Locate the board to build. For example, if you wanted to build u-boot for the leon3...

u-boot$ grep -R "leon3"

Set the toolchain

$ export CROSS_COMPILE=/opt/rtems-4.11/bin/sparc-rtems4.11-

Build the package with the following configure command:

$ /configure --prefix=/tmp/g2/build $ make all install

where the prefix can be anything suitable for your machine. If configure fails with a missing LZO library check you have the lzo-devel package installed.

To make the floppy image follow the instructions in the Grub Wiki at ​http://grub.enbug.org/TestingOnX86. This script is adapted from the instructions:

#! /bin/sh -x grub=/tmp/g2/build workspace=/tmp/g2 mnt=$workspace/mnt/loop file=$workspace/rtems-boot.img export PATH=$grub/bin:$grub/sbin:$PATH mkdir -p $workspace cd $workspace grub-mkimage -o core.img _chain ls pc multiboot gpt fat boot reboot configfile cat help dd if=/dev/zero of=$file bs=512 count=2880 /sbin/mkdosfs $file mkdir -p $mnt mount -o loop -t vfat $file $mnt mkdir -p $mnt/boot/grub cp $grub/lib/grub/i386-pc/boot.img core.img $grub/lib/grub/i386-pc/*.mod $mnt/boot/grub echo "configfile (hd0,0)/rtems-grub.cfg" > $mnt/boot/grub/grub.cfg echo '(fd0)' $file > tmp_device.map grub-setup -d $mnt/boot/grub -r '(fd0)' -m tmp_device.map '(fd0)' rm -f tmp_device.map umount $mnt