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============================
Common Linux Build Targets
============================
help (see almost all targets available)
*_defconfig (kernel configuration)
menuconfig (change kernel configuration)
savedefconfig (convert the current configuration to a defconfig)
zImage (build arm kernel)
modules (build modules)
modules_install (install modules)
*.dtb (compile the device tree)
clean (delete all object files)
================
Pre-Requisites
================
If you want to build and boot a kernel, you need the following:
- kernel source
- .config kernel configuration file (or defconfig)
- device tree (arm/powerpc only)
===============================
Create Wrapper mk.sh for make
===============================
#!/bin/sh
# define prefix to toolchain commands
CROSS_COMPILE=/opt/gcc-linaro-6.3.1-2017.05-x86_64_arm-linux-gnueabihf/bin/arm-linux-gnueabihf-
# define the architecture to build for
# (this is the directory-name in arch/ )
ARCH=arm
export CROSS_COMPILE ARCH
exec make $@
===========
Procedure
===========
# unpack the kernel soruce
tar xJf ~/Downloads/linux-4.18.5.tar.xz
# change to kernel source directory
cd linux-4.18.5
# configure the kernel for vexpress boards
../mk.sh vexpress_defconfig
# perform custom changes to the configuration
../mk.sh menuconfig
# save the custom changes as a defconfig
../mk.sh savedefconfig
# copy the custom defconfig to the kernel sources
# (so it is available as a make target)
cp defconfig arch/arm/configs/myboard_defconfig
# build the kernel
../mk.sh -j 4 zImage
# build the device tree
../mk.sh vexpress-v2p-ca9.dtb
# the built kernel is here: arch/arm/boot/zImage
# the built device tree is here: arch/arm/boot/dts/vexpress-v2p-ca9.dtb
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