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154 lines
4.5 KiB
Markdown
154 lines
4.5 KiB
Markdown
# CROSS-COMPILING
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Installing a distro for ARM. The distro is CRUX, the target is an Odroid C2.
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## TOC
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1. [CROSS COMPILATION TOOLS](#cross-compilation-tools)
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2. [PARTITIONING](#partitioning)
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3. [BOOTLOADER](#bootloader)
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3. [MOUNTING](#mounting)
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4. [BOOT PARTITION](#boot-partition)
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5. [COMPILING KERNEL](#compiling-kernel)
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6. [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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```
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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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```
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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-_"
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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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`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
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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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`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`
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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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* Make boot filesystem according to supported bootloader (only "_mkfs.vfat_")
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`mkfs.<BOOTLOADER_FILESYSTEM> /dev/mmcblk0p1`
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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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```
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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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make ARCH=arm64 CROSS_COMPILE=arm-none-eabi- odroidc2_defconfig
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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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```
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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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```
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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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## 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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`mkdir /mnt/boot`
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* mount boot filesystem
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`mount /dev/mmcblk0p1 /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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`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: making kernel config
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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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```
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export ARCH=arm64
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export CROSS_COMPILE=arm-none-eabi-
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make odroidc2_defconfig
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```
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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`
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## ROOT PARTITION
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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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