====== Installing required packages ====== You will need install required packages before you start to build Linux kernel on your Ubuntu desktop. $ sudo apt-get update $ sudo apt-get install git $ sudo apt-get install lib32stdc++6 lib32z1 lzop u-boot-tools $ sudo apt-get install build-essential gcc $ sudo apt-get install libncurses5-dev ====== Kernel ====== This page introduce how you can download and compile the Linux kernel for **ODROID-C1**. You can select one of two version, GCC 4.9.2 or GCC 4.7.3. Since Linux release **v1.1**, the official toolchain for **ODROID-C1** is switched to **GCC 4.9.2**. ===== Toolchain (4.9.2)===== Click one of the site to download toolchain to build Linux kernel. * [[http://releases.linaro.org/archive/14.09/components/toolchain/binaries/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux.tar.xz|Download #1]] * [[http://dn.odroid.com/toolchains/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux.tar.xz|Download #2]] Once the download is done, extract the tarball to **/opt/toolchains/**. $ sudo mkdir -p /opt/toolchains $ sudo tar xvf gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux.tar.xz -C /opt/toolchains/ In order to add the toolchain path to PATH, paste below lines to **$HOME/.bashrc**. export ARCH=arm export CROSS_COMPILE=arm-linux-gnueabihf- export PATH=/opt/toolchains/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/:$PATH You can check if the toolchain installed above works properly while checking the version of toolchain. If you can find **gcc version 4.9.2 20140904 (prerelease)** at the end of the line, the toolchain is well installed. $ arm-linux-gnueabihf-gcc -v Using built-in specs. COLLECT_GCC=/opt/toolchains/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/arm-linux-gnueabihf-gcc COLLECT_LTO_WRAPPER=/opt/toolchains/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/../libexec/gcc/arm-linux-gnueabihf/4.9.2/lto-wrapper Target: arm-linux-gnueabihf Configured with: /cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/src/gcc-linaro-4.9-2014.09/configure --build=i686-build_pc-linux-gnu --host=i686-build_pc-linux-gnu --target=arm-linux-gnueabihf --prefix=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/install --with-sysroot=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/install/arm-linux-gnueabihf/libc --enable-languages=c,c++,fortran --disable-multilib --enable-multiarch --with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=vfpv3-d16 --with-float=hard --with-pkgversion='crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro GCC 4.9-2014.09' --with-bugurl=https://bugs.launchpad.net/gcc-linaro --enable-__cxa_atexit --enable-libmudflap --enable-libgomp --enable-libssp --with-gmp=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-mpfr=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-mpc=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-isl=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-cloog=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-libelf=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --enable-threads=posix --disable-libstdcxx-pch --enable-linker-build-id --enable-plugin --enable-gold --with-local-prefix=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/install/arm-linux-gnueabihf/libc --enable-c99 --enable-long-long --with-mode=thumb --disable-multilib --with-float=hard Thread model: posix gcc version 4.9.2 20140904 (prerelease) (crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro GCC 4.9-2014.09) ===== Toolchain (4.7.3)===== Click one of the site to download toolchain to build Linux kernel. * [[https://releases.linaro.org/13.04/components/toolchain/binaries/gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux.tar.bz2|Download #1]] * [[http://dn.odroid.com/toolchains/gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux.tar.bz2|Download #2]] Once the download is done, extract the tarball to **/opt/toolchains/**. $ sudo mkdir -p /opt/toolchains $ sudo tar jxvf gcc-linaro-arm-linux-gnueabihf-4.7-2012.12-20121214_linux.tar.bz2 -C /opt/toolchains/ In order to add the toolchain path to PATH, paste below lines to **$HOME/.bashrc**. export ARCH=arm export CROSS_COMPILE=arm-linux-gnueabihf- export PATH=/opt/toolchains/gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux/bin:$PATH You can apply the change if you login again or import to apply this change, login again or evaluate **$HOME/.bashrc** with source command. $ source ~/.bashrc You can check if the toolchain installed above works properly while checking the version of toolchain. If you can find **gcc version 4.7.3 20130328 (prerelease)** at the end of the line, the toolchain is well installed. $ arm-linux-gnueabihf-gcc -v Using built-in specs. COLLECT_GCC=arm-linux-gnueabihf-gcc COLLECT_LTO_WRAPPER=/opt/toolchains/gcc-linaro-arm-linux-gnueabihf-4.7-2013.04-20130415_linux/bin/../libexec/gcc/arm-linux-gnueabihf/4.7.3/lto-wrapper Target: arm-linux-gnueabihf Configured with: /cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/src/gcc-linaro-4.7-2013.04/configure --build=i686-build_pc-linux-gnu --host=i686-build_pc-linux-gnu --target=arm-linux-gnueabihf --prefix=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/install --with-sysroot=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/install/arm-linux-gnueabihf/libc --enable-languages=c,c++,fortran --enable-multilib --with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=vfpv3-d16 --with-float=hard --with-pkgversion='crosstool-NG linaro-1.13.1-4.7-2013.04-20130415 - Linaro GCC 2013.04' --with-bugurl=https://bugs.launchpad.net/gcc-linaro --enable-__cxa_atexit --enable-libmudflap --enable-libgomp --enable-libssp --with-gmp=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-mpfr=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-mpc=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-ppl=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-cloog=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-libelf=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static --with-host-libstdcxx='-L/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/.build/arm-linux-gnueabihf/build/static/lib -lpwl' --enable-threads=posix --disable-libstdcxx-pch --enable-linker-build-id --enable-gold --with-local-prefix=/cbuild/slaves/oorts/crosstool-ng/builds/arm-linux-gnueabihf-linux/install/arm-linux-gnueabihf/libc --enable-c99 --enable-long-long --with-mode=thumb Thread model: posix gcc version 4.7.3 20130328 (prerelease) (crosstool-NG linaro-1.13.1-4.7-2013.04-20130415 - Linaro GCC 2013.04) ===== Checkout ===== You can checkout **U-boot** source tree from **[[https://github.com/hardkernel/u-boot/tree/odroidc-v2011.03|Hardkernel's Github]]**, please note that we distribute the Linux kernel in different branches for Android and other Linux distributions. ==== Android ==== $ git clone --depth 1 https://github.com/hardkernel/linux.git -b odroidc-3.10.y-android $ cd linux ==== Linux ==== $ git clone --depth 1 https://github.com/hardkernel/linux.git -b odroidc-3.10.y $ cd linux ===== Compile ===== You must do kernel configuration for **ODROID-C1**, then start to build. Adding **-j** option on make command will help you to finish compiling faster. $ make odroidc_defconfig $ make <-j4> $ make <-j4> modules You have done to compile the Linux kernel (zImage), the device tree file (.dtb) and kernel modules (.ko). But in order to boot on **ODROID-C1**, you need **uImage** apart from **zImage** which have boot information and simply can make this. $ make uImage ===== Custom Kernel Build ===== If you have some kernel drivers wish to include for your custom build, you can select the drivers easily in Linux kernel tree. **make menuconfig** will show you text based menus help you to select kernel drivers. $ make menuconfig Once you done selecting the drivers, exit from the menu screen. Then you can start kernel build with **make** again. $ make <-j4> $ make <-j4> modules When you exit from kernel menu screen, you will have **.config** in the current directory what have changes for your custom build. You can back up this as a file, my_kernel.config for example, or can make a patch if you manage your own git. $ cp .config arch/arm/configs/odroidc_defconfig $ git add arch/arm/configs/odroidc_defconfig $ git commit -s -m "blahblahblah" $ git push ===== Installation ===== There are different instructions to install Linux kernel image and device tree for Android and Linux. Since Android loads both from a boot partition, we have to use **fastboot** to install into the dedicated partition. Please refer the partition table from [[http://odroid.com/dokuwiki/doku.php?id=en:c1_partition_table|here]]. In contrast, Linux boots by the instructions described in **boot.ini** the 1st FAT partition. ==== Android ==== This is the instruction to install kernel image, **uImage**, to the boot card. $ sudo fastboot flash boot This is to install a device tree file, **meson8b_odroidc.dtb**. $ sudo fastboot flash dtb ==== Linux (Cross build) ==== ** This explanation assume that your USB memory CARD reader is assigned at /dev/sdc. Be careful!** 1. Plug the Boot-Device(eMMC or SD) into the USB memory CARD reader and Connect the USB memory CARD reader to your HOST PC(Linux OS). 2. Copy the uImage and DT((meson8b_odroidc.dtb) to the FAT partition(1st partition) in the Boot-Device. $ mkdir -p mount $ sudo mount /dev/sdc1 ./mount $ sudo cp arch/arm/boot/uImage arch/arm/boot/dts/meson8b_odroidc.dtb ./mount && sync && sudo umount ./mount 3. Copy the driver modules to the EXT4 partition(2nd partition) in the Boot-Device. $ sudo mount /dev/sdc2 ./mount $ sudo make modules_install ARCH=arm INSTALL_MOD_PATH=./mount && sync && sudo umount ./mount $ rm -rf mount