How to create a custom kernel with initrd and ARCH patches

Question

Hi,
I like the default kernel because everything seems to work well and I think the Arch kernel includes patches I need (such as the mactel patch). But some options that i would like to be enabled are not. in fact i would like to use powertop but i can't because it needs the CONFIG_TIMER_STATS option.
What I would like is a kernel based on the arch kernel but with a different config file. Nothing more.
if i look at the solution on the Wiki, I see that I have to add all patches the standard kernel have ... Moreover there is no initrd creation. i think i will need it if I use the Arch kernel configuration.
And if i use the kernel26 PKGBUILD, I must change the package name in order to keep my current kernel. It's easy to do in the PKGBUILD but much more complicated to do it in the kernel26.install file beacuse I have to change the filenames in /boot and I do not want to replace the kernel26 files.
So do you have any ideas how to compile my custom kernel ? Is there a better solution ?
Thanks.
Mildred.
Last edited by mildred (2007-07-03 01:46:33)

Answer 1

tomk wrote:It's possible I'm missing something here, but I don't understand what you're worried about. If I understand correctly, you now have a PKGBUILD and associated files for kernel26mildred (or whatever you've decided to call it). Why do you think you would have to change the files again when kernel26 is updated?
don't the patches change from version to version?
anyways, i was bored so i wrote a little script... edit the configuration variables at the top and it'll do the work for you. just put it in /var/abs/kernels or wherever you have the kernel26/ at, chmod +x scriptname, and run.
if you're in /var/abs/kernels you'll probably have to run as root.
from my testing, it seems to be all working (looking at resulting files and no errors so far from makepkg); but i'm still building my test kernel with it.
#!/bin/bash
# Author: kano <[email protected]>
# Configuration #
appendname="-custom1" # Name to append to kernel package
BUILD=0 # Build package when done? No = 0; Yes = 1
#MAKEPKGOPT="" # Uncomment if you're building after you make; Add any options you want passed to makepkg (can be nothing)
# Work starts here; shouldn't have to edit anything below #
mkdir kernel26${appendname}/
cp kernel26/* kernel26${appendname}/
regen_md5sum() {
if [ ${file} != 'PKGBUILD' ]; then
echo "Regenerating md5sum for ${file}"
cat kernel26${appendname}/PKGBUILD \
| sed "s/'`md5sum kernel26/${file} | awk '{ print $1 }'`'/'`md5sum kernel26${appendname}/${file} | awk '{ print $1 }'`'/;" \
> PKGBUILD.tmp
mv PKGBUILD.tmp kernel26${appendname}/PKGBUILD
fi
for file in "PKGBUILD" "kernel26.preset" "kernel26.install"; do
echo "Editing ${file}"
cat kernel26/${file} | \
sed "s/kernel26/kernel26${appendname}/g" \
| sed "s/vmlinuz26/vmlinuz26${appendname}/g" \
| sed "s/kconfig26/kconfig26${appendname}/g" \
| sed "s/System.map26/System.map26${appendname}/g" \
> kernel26${appendname}/${file}
# Regenerate md5sum
regen_md5sum
done
for file in "config" "config.x86_64"; do
echo "Editing ${file}"
cat kernel26/${file} | \
sed "s/CONFIG_LOCALVERSION=\"-ARCH\"/CONFIG_LOCALVERSION=\"-ARCH${appendname}\"/" \
> kernel26${appendname}/${file}
# Regenerate md5sum
regen_md5sum
done
mv kernel26${appendname}/mkinitcpio-kernel26.conf kernel26${appendname}/mkinitcpio-kernel26${appendname}.conf
mv kernel26${appendname}/kernel26.install kernel26${appendname}/kernel26${appendname}.install
mv kernel26${appendname}/kernel26.preset kernel26${appendname}/kernel26${appendname}.preset
# Add make menuconfig to PKGBUILD
cat kernel26${appendname}/PKGBUILD | \
sed 's/# load configuration/\n # configure kernel before build\n make menuconfig\n\n # load configuration/;' \
> PKGBUILD.tmp
mv PKGBUILD.tmp kernel26${appendname}/PKGBUILD
echo "Custom kernel pkgbuild created."
# To build or to not to build?
if [ ${BUILD} -eq 1 ]; then
cd kernel26${appendname}
makepkg ${MAKEPKGOPT}
fi