[fedora-arm] Fedora 2.6.38 kernel for ARM-OMAP
I was looking to try a newer kernel on the beagle board and panda board
I was using (both running F13), and decided to try building 2.6.38 from
the Fedora 15 SRPM. I modified the spec file to include an option to
build for armv7l, and added an armv7l config file, as well as armv7l
support in Makefile.config. I also included one 2.6.39 upstream patch
(PandaBoard-remove-unused-power-regulators).
All the source and binary packages I built are in:
http://people.redhat.com/dmarlin/packages/FedoraArm/
I built a kernel from the following source package:
SRPMS/kernel-2.6.38.5-24.01.fc13.src.rpm
using the F13 tools on the panda board, and installed and booted it on
both the beagle and panda boards. The command I use to build it is:
rpmbuild -bb --target=armv7l SPECS/kernel.spec
Before installing the kernel binary RPM, I installed new linux-firmware
and grubby RPMs on the boards. The 2.6.38 kernel requires a newer
version of linux-firmware than is available in the F13 ARM repo, so I
rebuilt the one from F15. The new grubby package is not really
necessary, but I patched it to be armv7l aware, otherwise it defaults to
x86 (and looks for lilo or grub bootloaders). The modifications also
provide a placeholder in case I wanted to modify it further to create
the uboot images for the beagle/panda boards.
To install the kernel on the panda board I just use:
rpm -ivh kernel-omap-2.6.38.5-24.01.fc13.armv7l.rpm
It takes a while to install, since it has to install all the modules,
make an initramfs, etc.
I keep all the uboot files in /boot/uboot. To build the uboot images
for this kernel I use:
cd /boot
mkimage -A arm -O linux -T kernel -C none -a 0x80008000 -e 0x80008000
-n 2.6.38.5-24.01.fc13.armv7l.omap -d
vmlinuz-2.6.38.5-24.01.fc13.armv7l.omap
uboot/uImage-2.6.38.5-24.01.fc13.armv7l.omap
mkimage -A arm -O linux -T ramdisk -C none -a 0 -e 0 -n initramfs -d
initramfs-2.6.38.5-24.01.fc13.armv7l.omap.img
uboot/uInitrd-2.6.38.5-24.01.fc13.armv7l.omap
I then reboot the board from the console, and interrupt the auto-boot
script. The commands I use to boot and test the new kernel on the panda
board are:
setenv mpurate 800
setenv bootargs console=ttyO2,115200n8 mem=463M ro rootwait
root=/dev/mmcblk0p4 mpurate=${mpurate} init=/sbin/init earlyprintk
rd_NO_PLYMOUTH
setenv bootcmd 'mmc rescan 0; mmc init; fatload mmc 0:1 0x80300000
uImage-2.6.38.5-24.01.fc13.armv7l.omap; fatload mmc 0:1 0x81600000
uInitrd-2.6.38.5-24.01.fc13.armv7l.omap; bootm 0x80300000 0x81600000'
boot
Your options may differ, depending on your flash configuration, uboot
version, etc., but these work for me.
I have not preformed extensive testing, but it does boot and seems to
work well on the F13 rootfs.
Notes:
I have only modified this to build for armv7l. Further modifications
will be necessary for other variants.
The config file I used is based on an older existing ARM config, so
I'm sure the options are not optimal.
The config file does not follow the Fedora conventions (broken down
between the generic, arch, and board config files).
I'm not sure the best way to break this out and maintain it, so
suggestions are welcome.
Please let me know if you have any questions, comments, or suggestions.
d.marlin