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# CROSS-COMPILING
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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.
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## TOC
1. [CROSS COMPILATION TOOLS ](#cross-compilation-tools )
2. [PARTITIONING ](#partitioning )
3. [BOOTLOADER ](#bootloader )
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4. [MOUNTING ](#mounting )
5. [BOOT PARTITION ](#boot-partition )
6. [COMPILING KERNEL ](#compiling-kernel )
7. [ROOT PARTITION ](#root-partition )
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## CROSS COMPILATION TOOLS
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Installing GCC cross compilation tools (for the X86 machine, not target ARM). Includes binutils.
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* OPTION 1: From repository (Devuan example)
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`sudo apt-get install gcc-arm-none-eabi`
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* OPTION 2: Proportioned by odroid
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```
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
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* Clear the section for the bootloader
`dd if=/dev/zero of=/dev/sdX bs=1M count=8`
* Enter fdisk
`fdisk /dev/sdX`
* Help
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`m`
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* Create new MBR partition table
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`o`
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* Create boot partition
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`n`
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* Make primary partition
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`p`
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* Choose partition number
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`1`
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* Assign start of boot partition at the end of the bootloader space
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`3073`
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* Assign end of boot partition
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`+128M`
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* Change display units to cylinders
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`u`
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* Create root partition
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`n`
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* Make primary partition
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`p`
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* Choose partition number
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`2`
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* Assign start of boot partition at the end of the bootloader space (default cylinder)
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`131`
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* Assign end of boot partition (default) by pressing ENTER
* Change display units back to sectors
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`u`
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* Show the partitions
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`p`
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* If you agree save and exit
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`w`
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* If you disagree delete a partition and start from that partition
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`d`
* or exit without saving
`q`
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* Make root filesystem
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`mkfs.<ROOT_FILESYSTEM> /dev/sdX2`
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* Make boot filesystem according to supported bootloader (only "_mkfs.vfat_")
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`mkfs.<BOOTLOADER_FILESYSTEM> /dev/sdX1`
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## BOOTLOADER
Minimum 3072 bytes free at the start of the drive and before the boot partition.
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* VERSION 1: Compile bootloader yourself
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```
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
```
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* VERSION 2: Download and extract the binary
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```
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
```
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* Flash bootloader
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```
chmod +x sd_fusing.sh
./sd_fusing.sh /dev/sdX
```
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* 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
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## MOUNTING
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* Mount root filesystem
`mount /dev/sdX2 /mnt`
* Create boot directory
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`mkdir /mnt/boot`
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* Mount boot filesystem
`mount /dev/sdX1 /mnt/boot`
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## BOOT PARTITION
Must be FAT32 and 64 MB minimum.
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* Clone kernel repo to destination "odroidc2-kernel-folder"
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`git clone --depth 1 --single-branch https://github.com/hardkernel/linux.git --branch odroidc2-v3.16.y odroidc2-kernel-folder`
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* Enter destination folder
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`cd odroidc2-kernel-folder`
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* OPTION 1: Make kernel config (oneliner)
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`make ARCH=arm64 CROSS_COMPILE=arm-none-eabi- odroidc2_defconfig`
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* OPTION 2: Make kernel config
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```
export ARCH=arm64
export CROSS_COMPILE=arm-none-eabi-
make odroidc2_defconfig
```
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* Refine configuration
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`make menuconfig`
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## COMPILING KERNEL
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* Compiling devicetree blobs to destination "INSTALL_DTBS_PATH=/mnt/boot/dtbs/meson64_odroidc2.dtb"
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`make -j 4 ARCH=arm64 CROSS_COMPILE=arm-none-eabi- INSTALL_DTBS_PATH=/mnt/boot/dtbs/ dtbs`
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* Compiling kernel to destination "INSTALL_PATH=/mnt/boot/Image"
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`make -j 4 ARCH=arm64 CROSS_COMPILE=arm-none-eabi- INSTALL_PATH=/mnt/boot/ Image`
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* Compiling the modules to destination "INSTALL_MOD_PATH=/mnt/"
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`make -j 4 ARCH=arm64 CROSS_COMPILE=arm-none-eabi- INSTALL_MOD_PATH=/mnt/ modules_install`
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* Compiling firmware to destination "INSTALL_FW_PATH=/mnt/lib/firmware/"
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`make -j 4 ARCH=arm64 CROSS_COMPILE=arm-none-eabi- INSTALL_FW_PATH=/mnt/lib/firmware/ firmware_install`
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* Compiling kernel C headers to destination "INSTALL_HDR_PATH=/mnt/usr/"
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`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.
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* Download CRUX image
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`wget -c http://resources.crux-arm.nu/files/devel-test/3.3/crux-arm-rootfs-3.3-64b-RC2.tar.xz`
* Extract CRUX image
`aunpack crux-arm-rootfs-3.3-64b-RC2.tar.xz`