akmod-custom-kernel.md

Akmod for custom kernel in Fedora

Download the Fedora kernel package and the linux sources, configure them and create the RPM package.

Custom kernel creation

Download kernel source RPM

Using fedpkg

$ fedpkg clone kernel

Using SRPM from repository

$ dnf download --source kernel

Switch to your desired branch

$ fedpkg switch-branch f31

Download Kernel source using git

Get the stable version of the kernel:

$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git

Configure the kernel

Copy the kernel configuration from the SRPM tree

~$ cp kernel/kernel-x86_64-fedora.config linux-stable/.config

Menuconfig is a nice way to configure the kernel.

$ cd linux-stable
linux-stable $ make menuconfig

Optionally build the kernel and test it

linux-stable $ make -j 4 bzImage && make -j 4 modules && mane modules_install

Copy the new kernel configuration to the SRPM

linux-stable $ cp .config ../kernel/kernel-x86_64-fedora.config

Create a kernel tarball

linux-stable $ git archive --format=tar.gz --prefix=linux-5.7.001 -o ../linux-5.7.001.tar.gz v5.7.001

Copy the tarball to the rpm sources directory

linux-stable $ cp ../linux-5.7.001.tar.gz ~/rpmbuild/SOURCES/

Modify source RPM

Edit the kernel.spec file:

...
%global baserelease rc7
...
%define base_sublevel 7
...
%define stable_update 0
...
%define rpmversion 5.%{upstream_sublevel}.0.imcsk8
...
%define buildid .local
...

Create new kernel package

kernel $ sudo dnf install -y audit-libs-devel binutils-devel  java-devel libcap-devel libcap-ng-devel llvm-toolset net-too
ls newt-devel numactl-devel pciutils-devel  perl perl-devel python3-devel python3-docutils xmlto xz-devel elfutils-devel
kernel $ cp -rp * ~/rpmbuild/SOURCES/
kernel $ rpmbuild --define='fedora 31'  --define='dist .fc31' --without debug --target x86_64  -ba kernel.spec 2>&1 | tee 
build.log

There might be some patches that don't apply, just comment them in the kernel.spec file

Custom akmod package

In this example, we will create a wl-kmod package for a broadcom wireless card.

Install the required packages

~# dnf install -y akmod-wl broadcom-wl

Edit the module package

~$ dnf download --source kmod-wl
~$ rpm -Uvh kmod-wl