Kernels/Arch Build System
See Kernels for the main article.
The Arch Build System can be used to build a custom kernel based on the official package. This compilation method can automate the entire process, and is based on a very well tested package. You can edit the PKGBUILD to use a custom kernel configuration or add additional patches.
Getting the Ingredients
Since you'll be using makepkg, follow the best practices outlined there first. For example, you cannot run makepkg as root/sudo. Therefore, create a
build directory in your user home first.
$ cd ~/ $ mkdir build $ cd build/
Install the package and the package group.
You need a clean kernel to start your customization from. Fetch the kernel package files from ABS into your build directory by running:
$ ABSROOT=. abs core/linux
If you have some problem with the firewall blocking the rsync port, you can try with -t, which uses the tarball to sync.
$ ABSROOT=. abs core/linux -t
Then, get any other file you need (e.g. custom configuration files, patches, etc.) from the respective sources.
Modifying the PKGBUILD
PKGBUILD and look for the
pkgbase parameter. Change this to your custom package name, e.g.:
Depending on the PKGBUILD you may have to also rename
linux.install to match the modified
pkgbase (e.g. for ).
In prepare function, you can apply needed kernel patch or change kernel build configuration.
If you need to change a few config options you can edit config file in the source. Change or copy existing config file to
config.x86_64 for 64bit system and
config for 32bit system.
Or you can use GUI tool to tweak the options. Uncomment one of the possibilities shown in the prepare() function of the PKGBUILD, e.g.:
... # load configuration # Configure the kernel. Replace the line below with one of your choice. #make menuconfig # CLI menu for configuration make nconfig # new CLI menu for configuration #make xconfig # X-based configuration #make oldconfig # using old config from previous kernel version # ... or manually edit .config ...
Load existing .config
If you have already a kernel
.config file, uncommenting one of the interactive config tools, such as
nconfig, and loading your
.config from there avoids any problems with kernel naming that may otherwise occur - except in the case of at least make menuconfig. See note.
Generate new checksums
As we modified config, we need to generate new checksums by running:
You can now proceed to compile your kernel by the usual command
If you have chosen an interactive program for configuring the kernel parameters (like menuconfig), you need to be there during the compilation.
$ makepkg -s
-s parameter will download any additional dependencies used by recent kernels such as xml and docs.
After running makepkg, you can have a look at the
linux.install file. You will see that some variables have changed.
Now, you only have to install the package as usual. Best practice is to install kernel headers first as they will be needed (e.g. to install the nvidia driver) for the custom kernel later.
# pacman -U kernel-headers_package # pacman -U kernel_package
Now, the folders and files for your custom kernel have been created, e.g.
/boot/vmlinuz-linux-test. To test your kernel, update your bootloader configuration file and add new entries ('default' and 'fallback') for your custom kernel. If you renamed your kernel in the PKGBUILD pkgbase you may have to rename the initramfs.img in your $build/pkg/kernel/etc before installing with pacman. That way, you can have both the stock kernel and the custom one to choose from.