CROSS-COMPILING

Installing a distro for ARM. The distro is CRUX, the target is an Odroid C2. The device will appears as "/dev/mmcblk0" (with "/dev/mmcblk0p1" and "/dev/mmcblk0p2" as the partitions) in the target machine, but it can be seen as "/dev/sdX" in your x86 computer. The unpacking tool is provided by Atool.

CROSS COMPILATION TOOLS

Installing GCC cross compilation tools (for the X86 machine, not target ARM). Includes binutils.

OPTION 1: Proportioned by Linaro

wget -c https://releases.linaro.org/components/toolchain/binaries/latest/aarch64-linux-gnu/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu.tar.xz
aunpack gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu.tar.xz

OPTION 2: From repository (Devuan example)
sudo apt-get install gcc-arm-none-eabi
NOTE: Check your tools are up-to-date to prevent errors like the lack of option "-mgeneral-regs-only".

Name of "CROSS_COMPILE" variable will change depending on the choosen option. This guide assumes cross-compilation tools are from Linaro and therefore will equal to "CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu-"

PARTITIONING

Clear the section for the bootloader
dd if=/dev/zero of=/dev/sdX bs=1M count=8
Enter fdisk
fdisk /dev/sdX
Help
m
Create new MBR partition table
o
Create boot partition
n
Make primary partition
p
Choose partition number
1
Assign start of boot partition at the end of the bootloader space
3073
Assign end of boot partition
+128M
Change display units to cylinders
u
Create root partition
n
Make primary partition
p
Choose partition number
2
Assign start of boot partition at the end of the bootloader space (default cylinder)
131
Assign end of boot partition (default) by pressing ENTER
Change display units back to sectors
u
Show the partitions
p
If you agree save and exit
w
If you disagree delete a partition and start from that partition
d
or exit without saving
q
Make root filesystem
mkfs.<ROOT_FILESYSTEM> /dev/sdX2
Make boot filesystem according to supported bootloader (only "mkfs.vfat")
mkfs.<BOOTLOADER_FILESYSTEM> /dev/sdX1

BOOTLOADER

Minimum 3072 bytes free at the start of the drive and before the boot partition.

OPTION 1: Download and extract the binary

wget http://odroid.in/guides/ubuntu-lfs/boot.tar.gz
tar -zxvf boot.tar.gz
cd boot

Alternative download link: http://dn.odroid.com/S905/BootLoader/ODROID-C2/c2_boot_release_ubuntu.tar.gz

OPTION 2: Compile the bootloader yourself

git clone https://github.com/hardkernel/u-boot.git -b odroidc2-v2015.01
cd u-boot
make ARCH=arm64 CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu- odroidc2_defconfig
make -j4
cd boot

Flash the bootloader

chmod +x sd_fusing.sh
./sd_fusing.sh /dev/sdX

Notice the target is the device NOT a partition
Set resolution by editing file root/boot/boot.ini
Might want to comment out the display-autodetect option

MOUNTING

Mount root filesystem
mount /dev/sdX2 /mnt
Create boot directory
mkdir /mnt/boot
Mount boot filesystem
mount /dev/sdX1 /mnt/boot

ROOT PARTITION

Can be the rest of the disk.

Go to root directory
cd /mnt/
Download CRUX image
wget -c http://resources.crux-arm.nu/files/devel-test/3.3/crux-arm-rootfs-3.3-64b-RC2.tar.xz
Extract CRUX image to root directory
aunpack crux-arm-rootfs-3.3-64b-RC2.tar.xz --extract-to=/mnt
Change network interface with the rules you want (IP, gateway, domain, etc). elvis /etc/rc.d/net
On the "/etc/resolv.conf.head" file set your preferred DNS provider (this example is from OpenNIC). nameserver 185.121.177.177
Change the "/etc/fstab" file with appropriate filesystems.

/dev/sda1    /boot    <BOOTLOADER_FILESYSTEM>    defaults 0 1
/dev/sda2    /    <ROOT_FILESYSTEM>      errors=remount-ro,noatime 0 1

Uncomment the lines referring to "devpts", "tmp", and "shm" as some programs require it (Firefox), also "USB" and or "cdrom" if using those.
Change the font, keyboard, timezone, hostname and services on the "/etc/rc.conf" file. ls /usr/share/kbd/keymaps/

BOOT PARTITION

Must be FAT32 and 64 MB minimum.

Clone kernel repo to destination "odroidc2-kernel-folder"
git clone --depth 1 --single-branch https://github.com/hardkernel/linux.git --branch odroidc2-v3.16.y odroidc2-kernel-folder
Enter destination folder
cd odroidc2-kernel-folder
OPTION 1: Make kernel config (oneliner)
make ARCH=arm64 CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu- odroidc2_defconfig
OPTION 2: Make kernel config

export ARCH=arm64
export CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu-
make odroidc2_defconfig

Refine configuration
make menuconfig

COMPILING KERNEL

Compiling the devicetree blobs
make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu- INSTALL_DTBS_PATH=/mnt/boot/dtbs/ dtbs
Compiling the kernel
make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu- INSTALL_PATH=/mnt/boot/ Image
Compiling the modules
make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu- INSTALL_MOD_PATH=/mnt/ modules
Installing the kernel to destination "/mnt/boot/Image"
cp arch/arm64/boot/Image /mnt/boot/
Installing the devicetree blobs to destination "/mnt/boot/dtbs/meson64_odroidc2.dtb"
cp arch/arm64/boot/dts/meson64_odroidc2.dtb /mnt/boot/dtbs/
Installing the modules to destination "INSTALL_MOD_PATH=/mnt/"
make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu- INSTALL_MOD_PATH=/mnt/ modules_install
Compiling the firmware to destination "INSTALL_FW_PATH=/mnt/lib/firmware/"
make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu- INSTALL_FW_PATH=/mnt/lib/firmware/ firmware_install
Compiling the kernel C headers to destination "INSTALL_HDR_PATH=/mnt/usr/"
make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO_TOOLS_DIRECTORY>/bin/aarch64-linux-gnu- INSTALL_HDR_PATH=/mnt/usr/ headers_install

And done. Next follow the distro tweaks: https://github.com/mayfrost/guides/blob/master/DISTROS.md Also check the list of software alternative to bloatware and support minimalism https://github.com/mayfrost/guides/blob/master/ALTERNATIVES.md

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