Differences between revisions 12 and 13
⇤ ← Revision 12 as of 2017-08-26 02:41:52 →
Size: 2886
Editor: RogerShimizu
Comment: put "clone git repo of debian kernel" section before "get dfsg tarball of kernel" section
← Revision 13 as of 2017-08-28 12:40:57 → ⇥
Size: 2952
Editor: RogerShimizu
Comment: Enable build in parallel
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# Enable build in parallel
export MAKEFLAGS="-j$(($(nproc)*2))"

Simple steps to cross-build Debian Kernel package. The following steps confirmed working under Stretch.

Install Cross-Build Dependency

apt install fakeroot git kernel-wedge quilt ccache crossbuild-essential-<ARCH>

BTW. The following ARCH support cross-build explained here. 

# apt-cache search crossbuild-essential-
crossbuild-essential-arm64 - Informational list of cross-build-essential packages
crossbuild-essential-armel - Informational list of cross-build-essential packages
crossbuild-essential-armhf - Informational list of cross-build-essential packages
crossbuild-essential-mipsel - Informational list of cross-build-essential packages
crossbuild-essential-powerpc - Informational list of cross-build-essential packages
crossbuild-essential-ppc64el - Informational list of cross-build-essential packages

Clone Git Repo of Debian Kernel

git clone -n https://anonscm.debian.org/git/kernel/linux.git debian-kernel
cd debian-kernel
# list all tags
git tag -l
# starting from a release is a good idea
git checkout -b stretch debian/4.9.30-2+deb9u3

Get DFSG tarball of Kernel

Simple way if it already reached archive: 

wget https://deb.debian.org/debian/pool/main/l/linux/linux_4.9.30.orig.tar.xz

Other a few ways to get the pristine tarball of upstream linux kernel:

Example: 

# get whole git repo from internet, more than 1GB and may need hours to finish
git clone https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable ../linux-stable
# generate DFSG compatible kernel source
debian/bin/genorig.py ../linux-stable

Cross Build

Take ARM/armel, flavour marvell as example. 

# This triplet is defined in
#   https://anonscm.debian.org/cgit/kernel/linux.git/tree/debian/config/<ARCH>/
# and its sub-directories.
# Here is just an example
ARCH=armel
FEATURESET=none
FLAVOUR=marvell

export $(dpkg-architecture -a$ARCH)
export PATH=/usr/lib/ccache:$PATH
# Build profiles is from: https://anonscm.debian.org/cgit/kernel/linux.git/tree/debian/README.source
export DEB_BUILD_PROFILES="nopython nodoc pkg.linux.notools"
# Enable build in parallel
export MAKEFLAGS="-j$(($(nproc)*2))"
# Disable -dbg (debug) package is only possible when distribution="UNRELEASED" in debian/changelog
export DEBIAN_KERNEL_DISABLE_DEBUG=
[ "$(dpkg-parsechangelog --show-field Distribution)" = "UNRELEASED" ] &&
  export DEBIAN_KERNEL_DISABLE_DEBUG=yes

fakeroot make -f debian/rules clean
fakeroot make -f debian/rules orig
fakeroot make -f debian/rules source
fakeroot make -f debian/rules.gen setup_${ARCH}_${FEATURESET}_${FLAVOUR}
fakeroot make -f debian/rules.gen binary-arch_${ARCH}_${FEATURESET}_${FLAVOUR}

CategoryKernel