Support #686
Updated by Daniel Curtis almost 10 years ago
This is a guide on how I compile a kernel module for Raspbian on a Raspberry Pi 2.
h2. Prepare the Environment
* Make sure the system is up to date:
<pre>
apt-get update && apt-get upgrade
</pre>
* Install a few dependencies:
<pre>
apt-get install build-essential bc automake autoconf libtool gawk alien fakeroot zlib1g-dev uuid-dev libblkid-dev libselinux-dev parted lsscsi wget
</pre>
h2. Download the Kernel
* Clone the latest raspberry pi toolchain:
<pre>
cd /usr/src
git clone https://github.com/raspberrypi/tools
</pre>
* Export the toolchain path:
<pre>
export CCPREFIX=/usr/src/tools/arm-bcm2708/arm-bcm2708-linux-gnueabi/bin/arm-bcm2708-linux-gnueabi-
</pre>
* Download the latest linux kernel for the raspberry pi:
<pre>
cd /usr/src
git clone https://github.com/raspberrypi/linux
</pre>
* Then checkout the current kernel version:
<pre>
cd /usr/src/linux
zgrep "* firmware as of" /usr/share/doc/raspberrypi-bootloader/changelog.Debian.gz | head -1 | awk '{ print $5 }' | git checkout -
</pre>
* Then export the kernel source path:
<pre>
export KERNEL_SRC=/usr/src/linux
</pre>
h2. Compile the Kernel Modules
* Load the configs kernel module:
<pre>
modprobe configs
</pre>
* Load the current config into the kernel source directory:
<pre>
zcat /proc/config.gz > /usr/src/linux/.config
</pre>
* Prepare the kernel build environment:
<pre>
cd /usr/src/linux
make mrproper
</pre>
* Use the previous kernel config with the new kernel build environment:
<pre>
make oldconfig
</pre>
* Build the kernel:
<pre>
make -j4
</pre>
* Now use a make file that references the kernel source directory to built the kernel module only, use a line like:
<pre>
PREFIX = /usr/src/tools/arm-bcm2708/arm-bcm2708-linux-gnueabi/bin/arm-bcm2708-linux-gnueabi-
make -C /usr/src/linux M=$(SRC) modules
</pre>
h2. Resources
* http://lostindetails.com/blog/post/Compiling-a-kernel-module-for-the-raspberry-pi-2
* http://openstack.prov12n.com/openstack-on-raspberry-pi-part-2-getting-started/
* https://raspberrypicloud.wordpress.com/2013/03/12/building-an-lxc-friendly-kernel-for-the-raspberry-pi/
* http://elinux.org/Raspberry_Pi_Kernel_Compilation