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Update CROSS-COMPILING.md
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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 is 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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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
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@ -15,10 +15,10 @@ Installing a distro for ARM. The distro is CRUX, the target is an Odroid C2. The
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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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* 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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* OPTION 2: Proportioned by odroid
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```
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wget http://odroid.in/guides/ubuntu-lfs/arm-unknown-linux-gnueabi.tar.xz
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tar -Jxf arm-unknown-linux-gnueabi.tar.xz
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@ -28,55 +28,55 @@ Name of "_CROSS_COMPILE_" variable will change depending on the choosen option.
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## PARTITIONING
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* clear the section for the bootloader
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`dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=8`
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* enter fdisk
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`fdisk /dev/mmcblk0`
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* help
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* Clear the section for the bootloader
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`dd if=/dev/zero of=/dev/sdX bs=1M count=8`
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* Enter fdisk
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`fdisk /dev/sdX`
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* Help
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`m`
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* create new MBR partition table
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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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* Create boot partition
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`n`
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* make primary partition
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* Make primary partition
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`p`
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* choose partition number
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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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* 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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* Assign end of boot partition
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`+128M`
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* change display units to cylinders
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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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* Create root partition
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`n`
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* make primary partition
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* Make primary partition
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`p`
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* choose partition number
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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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* 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
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* change display units back to sectors
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* Assign end of boot partition (default) by pressing ENTER
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* Change display units back to sectors
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`u`
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* show the partitions
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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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* 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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* If you disagree delete a partition and start from that partition
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`d`
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* or exit without saving
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`q`
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* Make root filesystem
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`mkfs.<ROOT_FILESYSTEM> /dev/mmcblk0p2`
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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/mmcblk0p1`
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`mkfs.<BOOTLOADER_FILESYSTEM> /dev/sdX1`
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## BOOTLOADER
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Minimum 3072 bytes free at the start of the drive and before the boot partition.
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* VERSION 1: compile
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* VERSION 1: Compile bootloader yourself
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```
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git clone https://github.com/hardkernel/u-boot.git -b odroidc2-v2015.01
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cd u-boot
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@ -85,44 +85,44 @@ make -j4
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cd boot
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```
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* VERSION 2: download and extract the binary
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* VERSION 2: Download and extract the binary
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```
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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
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tar -zxvf boot.tar.xz
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cd boot
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```
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* flash bootloader
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* Flash bootloader
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```
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chmod +x sd_fusing.sh
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./sd_fusing.sh /dev/sdX
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```
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* notice the target is the device NOT any partition
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* set resolution by editing file root/boot/boot.ini
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* might want to comment-out the display-autodetect option
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* Notice the target is the device NOT any partition
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* Set resolution by editing file root/boot/boot.ini
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* Might want to comment-out the display-autodetect option
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## MOUNTING
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* mount root filesystem
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`mount /dev/mmcblk0p2 /mnt`
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* create boot directory
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* Mount root filesystem
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`mount /dev/sdX2 /mnt`
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* Create boot directory
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`mkdir /mnt/boot`
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* mount boot filesystem
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`mount /dev/mmcblk0p1 /mnt/boot`
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* Mount boot filesystem
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`mount /dev/sdX1 /mnt/boot`
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## BOOT PARTITION
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Must be FAT32 and 64 MB minimum.
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* cloning kernel repo to destination "odroidc2-kernel-folder"
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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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* Enter destination folder
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`cd odroidc2-kernel-folder`
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* OPTION 1: making kernel config
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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: making kernel config
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* OPTION 2: Make kernel config
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```
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export ARCH=arm64
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export CROSS_COMPILE=arm-none-eabi-
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@ -151,3 +151,5 @@ 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`
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* Extract CRUX image
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`aunpack crux-arm-rootfs-3.3-64b-RC2.tar.xz`
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