CROSS-COMPILING

Installing a distro for ARM. The distro is CRUX, the target is an Odroid C2.

CROSS COMPILATION TOOLS

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

OPTION 1: from repository (Devuan example)
sudo apt-get install gcc-arm-none-eabi
OPTION 2: proportioned by odroid

wget http://odroid.in/guides/ubuntu-lfs/arm-unknown-linux-gnueabi.tar.xz
tar -Jxf arm-unknown-linux-gnueabi.tar.xz

Name of "CROSS_COMPILE" variable will change depending on the choosen option. This guide assumes from repository and therefore will equal to "CROSS_COMPILE=arm-none-eabi-"

PARTITIONING

clear the section for the bootloader
dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=8
enter fdisk
fdisk /dev/mmcblk0
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/mmcblk0p2
Make boot filesystem according to supported bootloader (only "mkfs.vfat")
mkfs.<BOOTLOADER_FILESYSTEM> /dev/mmcblk0p1

BOOTLOADER

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

VERSION 1: compile

git clone https://github.com/hardkernel/u-boot.git -b odroidc2-v2015.01
cd u-boot
make ARCH=arm64 CROSS_COMPILE=arm-none-eabi- odroidc2_defconfig
make -j4
cd boot

VERSION 2: download and extract the binary

wget http://odroid.in/guides/ubuntu-lfs/boot.tar.gz # http://dn.odroid.com/S905/BootLoader/ODROID-C2/c2_boot_release_ubuntu.tar.gz
tar -zxvf boot.tar.xz
cd boot

flash bootloader

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

notice the target is the device NOT any 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/mmcblk0p2 /mnt
create boot directory
mkdir /mnt/boot
mount boot filesystem
mount /dev/mmcblk0p1 /mnt/boot

BOOT PARTITION

Must be FAT32 and 64 MB minimum.

cloning 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: making kernel config
make ARCH=arm64 CROSS_COMPILE=arm-none-eabi- odroidc2_defconfig
OPTION 2: making kernel config

export ARCH=arm64
export CROSS_COMPILE=arm-none-eabi-
make odroidc2_defconfig

Refine configuration
make menuconfig

COMPILING KERNEL

Compiling devicetree blobs to destination "INSTALL_DTBS_PATH=/mnt/boot/dtbs/meson64_odroidc2.dtb"
make -j 4 ARCH=arm64 CROSS_COMPILE=arm-none-eabi- INSTALL_DTBS_PATH=/mnt/boot/dtbs/ dtbs
Compiling kernel to destination "INSTALL_PATH=/mnt/boot/Image"
make -j 4 ARCH=arm64 CROSS_COMPILE=arm-none-eabi- INSTALL_PATH=/mnt/boot/ Image
Compiling the modules to destination "INSTALL_MOD_PATH=/mnt/"
make -j 4 ARCH=arm64 CROSS_COMPILE=arm-none-eabi- INSTALL_MOD_PATH=/mnt/ modules_install
Compiling firmware to destination "INSTALL_FW_PATH=/mnt/lib/firmware/"
make -j 4 ARCH=arm64 CROSS_COMPILE=arm-none-eabi- INSTALL_FW_PATH=/mnt/lib/firmware/ firmware_install
Compiling kernel C headers to destination "INSTALL_HDR_PATH=/mnt/usr/"
make -j 4 ARCH=arm64 CROSS_COMPILE=arm-none-eabi- INSTALL_HDR_PATH=/mnt/usr/ headers_install

ROOT PARTITION

Can be the rest of the disk.

Download CRUX image
wget -c http://resources.crux-arm.nu/files/devel-test/3.3/crux-arm-rootfs-3.3-64b-RC2.tar.xz

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