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Building powerpc kernels
If you're not lucky enough to have a powerpc laptop, you can build with a cross compiler.
Some distros ship a cross toolchain, otherwise you can use a tarball.
You can use the toolchains helpfully provided by bootlin.
cd /tmp
wget http://toolchains.free-electrons.com/downloads/releases/toolchains/powerpc64le-power8/tarballs/powerpc64le-power8--glibc--bleeding-edge-2017.05-toolchains-1-1.tar.bz2
tar -xf powerpc64le-power8--glibc--bleeding-edge-2017.05-toolchains-1-1.tar.bz2
wget http://toolchains.free-electrons.com/downloads/releases/toolchains/powerpc64-power8/tarballs/powerpc64-power8--glibc--bleeding-edge-2017.05-toolchains-1-1.tar.bz2
tar -xf powerpc64-power8--glibc--bleeding-edge-2017.05-toolchains-1-1.tar.bz2
Then for little endian:
export CROSS_COMPILE=/tmp/powerpc64le-power8--glibc--bleeding-edge/bin/powerpc64le-linux-
or for big endian:
export CROSS_COMPILE=/tmp/powerpc64-power8--glibc--bleeding-edge/bin/powerpc64-linux-
Install the cross-toolchain with:
sudo apt-get install gcc-powerpc64le-linux-gnu gcc-powerpc-linux-gnu libc-dev-powerpc-cross libc-dev-ppc64el-cross
If you don't already have them installed, you also need make gcc bc.
Then for little endian:
export CROSS_COMPILE=powerpc64le-linux-gnu-
or for big endian:
export CROSS_COMPILE=powerpc-linux-gnu-
Install the cross-toolchain with:
sudo dnf install gcc-c++-powerpc64-linux-gnu binutils-powerpc64-linux-gnu gcc-powerpc64-linux-gnu
Then for both endians:
export CROSS_COMPILE=powerpc64-linux-gnu-
When cross-building you need to tell the kernel build system that you want to
build for the powerpc architecture, and tell it where your toolchain is. You can
do that by setting environment variables (as we'll show here), or on the make
command line.
To set the architecture use:
export ARCH=powerpc
We also need to set the cross compiler. Depending on which one you're using, and
which endian you're building for it differs slightly. If you followed the
instructions above to install a toolchain, you've already done it by setting CROSS_COMPILE. If you
didn't follow the instructions above then you'll have to set CROSS_COMPILE to
the path of your cross compiler.
Then you can build the kernel for little endian with:
make powernv_defconfig # or pseries_le_defconfig, or ppc64le_defconfig
make
Or for big endian with:
make ppc64_defconfig # or pseries_defconfig, pmac32_defconfig etc.
make
For a faster build use:
make -j $(nproc)