§2023-10-28

LinuxFactory

This document is only intended to support ODROID SBC from Hardkernel, supported boards are limited as listed below.

ODROID-N2
ODROID-N2Plus
ODROID-C4
ODROID-HC4

Custom Linux kernel

Package requirements

In order to build Linux kernel, you need to install developement packages required.

$ sudo apt install git build-essential bc flex bison libssl-dev libncurses-dev

Download the Source code

$ git clone --depth 1 https://github.com/tobetter/linux \
-b `uname -r | awk -F'.' '{print "odroid-" $1 "." $2 ".y"}'`
$ cd linux
$ git branch

Compile your custom kernel

Unline the generic desktop, your Ubuntu/Debian uses a package flash-kernel that helps to install the Linux kernel packages and the device tree file for a target device. You have to tweak a couple of things once in order to let the package flash-kernel install your custom kernel properly.
Compile

    :warning: Use these commands once before preceeding.

    $ cp /boot/config-$(uname -r) .config
    $ sed -i "s/.*CONFIG_LOCALVERSION_AUTO.*/CONFIG_LOCALVERSION_AUTO=y/g" .config
    $ echo "-odroid-arm64" > .scmversion

    Then, start to compile the Linux kernel source.

    $ make oldconfig
    $ make -j8

Install

    :warning: Use these commands once before preceeding.

    $ sudo sed -i "s/^force=.*$/force=\"yes\"/g" /usr/share/flash-kernel/functions
    $ sudo ln -s $PWD/arch/arm64/boot/dts /usr/lib/linux-image-$(cat include/config/kernel.release)

    Then, you can install the Linux kernel image and its drivers. The boot script, the device tree file and initramfs will be updated while installing by the flash-kernel. Please note that your Linux kernel version must ends with -odroid-arm64, so ensure the last log with make modules_install.

    $ sudo make modules_install
    $ sudo make install

alexlai@n2JamGen:~/build$ sudo arch-chroot  /mnt/gentoo/ /bin/bash
n2JamGen / # source /etc/profile
(chroot) n2JamGen / # cd /usr/src/
(chroot) n2JamGen /usr/src # ls
linux  linux-odroid-5.15.y  linux-odroidg12-4.9.y
(chroot) n2JamGen /usr/src # eselect kernel list
Available kernel symlink targets:
  [1]   linux-odroidg12-4.9.y
  [2]   linux-odroid-5.15.y *
(chroot) n2JamGen /usr/src # ls -l
total 8
lrwxrwxrwx  1 root root   19 Oct 28 19:17 linux -> linux-odroid-5.15.y
drwxrwxr-x 27 1026 1026 4096 Oct 28 20:22 linux-odroid-5.15.y
drwxr-xr-x 26 root root 4096 Oct 28 17:22 linux-odroidg12-4.9.y

genkernel

(chroot) n2JamGen /usr/src # emerge sys-kernel/genkernel


----

- [odroid-N2 Kernel](https://wiki.odroid.com/odroid-n2/software/building_kernel)

1) git clone

(chroot) n2JamGen / # emerge dev-vcs/git (chroot) n2JamGen / # cd /usr/src (chroot) n2JamGen /usr/src # git clone --depth 1 https://github.com/hardkernel/linux.git -b odroidg12-4.9.y (chroot) n2JamGen /usr/src # mv linux/ linux-odroidg12-4.9.y (chroot) n2JamGen /usr/src # eselect kernel list Available kernel symlink targets: [1] linux-odroidg12-4.9.y (chroot) n2JamGen /usr/src # eselect kernel set 1 (chroot) n2JamGen /usr/src # ls -l total 4 lrwxrwxrwx 1 root root 21 Oct 28 17:16 linux -> linux-odroidg12-4.9.y drwxr-xr-x 25 root root 4096 Oct 28 17:14 linux-odroidg12-4.9.y (chroot) n2JamGen /usr/src/linux-odroidg12-4.9.y # make odroidg12_defconfig HOSTCC scripts/basic/fixdep HOSTCC scripts/kconfig/conf.o SHIPPED scripts/kconfig/zconf.tab.c SHIPPED scripts/kconfig/zconf.lex.c SHIPPED scripts/kconfig/zconf.hash.c HOSTCC scripts/kconfig/zconf.tab.o HOSTLD scripts/kconfig/conf

configuration written to .config

(chroot) n2JamGen /usr/src/linux-odroidg12-4.9.y # time make -j 6 <-- has to sepecify, it did not take from make.conf ---> failed to compile