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CROSS-COMPILING.md
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# 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.
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](http://www.nongnu.org/atool/).
## TOC
@ -15,16 +15,17 @@ Installing a distro for ARM. The distro is CRUX, the target is an Odroid C2. The
## 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
* OPTION 1: Proportioned by [Linaro](https://releases.linaro.org/components/toolchain/binaries/latest/aarch64-linux-gnu/)
```
wget http://odroid.in/guides/ubuntu-lfs/arm-unknown-linux-gnueabi.tar.xz
tar -Jxf arm-unknown-linux-gnueabi.tar.xz
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
```
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-_"
* 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-compile tools are from Linaro and therefore will equal to "_CROSS\_COMPILE=<LINARO\_TOOLS\_DIRECTORY>/bin/aarch64-linux-gnu-_"
## PARTITIONING
@ -80,7 +81,7 @@ Minimum 3072 bytes free at the start of the drive and before the boot partition.
```
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 ARCH=arm64 CROSS_COMPILE=<LINARO\_TOOLS\_DIRECTORY>/bin/aarch64-linux-gnu- odroidc2_defconfig
make -j4
cd boot
```
@ -122,12 +123,12 @@ Must be FAT32 and 64 MB minimum.
`cd odroidc2-kernel-folder`
* OPTION 1: Make kernel config (oneliner)
`make ARCH=arm64 CROSS_COMPILE=arm-none-eabi- odroidc2_defconfig`
`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=arm-none-eabi-
export CROSS_COMPILE=<LINARO\_TOOLS\_DIRECTORY>/bin/aarch64-linux-gnu-
make odroidc2_defconfig
```
@ -137,20 +138,24 @@ make odroidc2_defconfig
## 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`
`make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO\_TOOLS\_DIRECTORY>/bin/aarch64-linux-gnu- 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`
`make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO\_TOOLS\_DIRECTORY>/bin/aarch64-linux-gnu- 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`
`make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO\_TOOLS\_DIRECTORY>/bin/aarch64-linux-gnu- INSTALL_MOD_PATH=/mnt/ modules`
* 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 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`
`make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO\_TOOLS\_DIRECTORY>/bin/aarch64-linux-gnu- 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`
`make -j 4 ARCH=arm64 CROSS_COMPILE=<LINARO\_TOOLS\_DIRECTORY>/bin/aarch64-linux-gnu- INSTALL_HDR_PATH=/mnt/usr/ headers_install`
## 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