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[メモ] Raspberry Pi カーネルビルド(Bash On Ubuntu On Windows10)

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概要

  • Win10上のbashで、ラズパイのカーネルビルドメモ
  • 参考: Kernel building の Cross-Build

環境

  • Windows 10 - 1703 (開発者モード)
  • Bash On Ubuntu On Windows = Windows Subsystem for Linux(WSL)

手順

  1. Bash On Ubuntu On Windows を導入

    • 開発者モードにする
    • Windowsの機能追加で、Windows Subsystem for Linux (WSL)をインストール
    • C:\Windows\System32\bash.exe を実行。=> 必要なファイルがダウンロードされるまで、待つ。
    • ユーザ作成 | (例) ユーザ名:pi パスワード:raspberry
  2. 初期設定

    コマンドラインで実行
    # パスワード入力なしで、sudo実行
    echo "$USER ALL=(ALL) NOPASSWD: ALL " | sudo tee /etc/sudoers.d/${USER}-nopasswd
    
    # パッケージ更新と、カーネルビルドに必要なパッケージのインストール
    # echo 'Acquire::http::Proxy "http://apt-cache-server:3142";' | sudo tee /etc/apt/apt.conf.d/02proxy
    sudo sh -c 'apt update && apt upgrade -y && apt install -y build-essential git libncurses5-dev bc htop byobu'
    
    # ssh server
    sudo dpkg-reconfigure openssh-server
    sudo sed  -i -e 's/PasswordAuthentication no/PasswordAuthentication yes/g' /etc/ssh/sshd_config
    sudo systemctl restart sshd
    
    # TimeZone設定
    # sudo dpkg-reconfigure tzdata
    
    # ツール取得
    git clone --depth=1 --quiet https://github.com/raspberrypi/tools ${HOME}/tools
    
    # aliasとPATHの設定
    #  alias b1='KERNEL=kernel  ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make'
    #  alias b2='KERNEL=kernel7 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make'
    #  alias b1cnf='b1 bcmrpi_defconfig'
    #  alias b2cnf='b2 bcm2709_defconfig'
    #  PATH=${HOME}/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin:$PATH
    echo -e "alias b1='KERNEL=kernel  ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make'\n""alias b2='KERNEL=kernel7 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- make'\n""alias b1cnf='b1 bcmrpi_defconfig'\n""alias b2cnf='b2 bcm2709_defconfig'\n"PATH=${HOME}/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian-x64/bin:'$PATH' >> ${HOME}/.bashrc
    source ${HOME}/.bashrc
    
  3. カーネルソース取得
    linux-rpi-4.9.y とかそういうフォルダができる。

    コマンドラインで実行
    ##特定のCOMMIT_IDを指定するか
    # 例: 2017-07-05-raspbian-jessieのカーネル
    # COMMIT_ID=be2540e540f5442d7b372208787fb64100af0c54
    
    ## rpi-4.9.yの最新
    COMMIT_ID=rpi-4.9.y
    
    wget https://github.com/raspberrypi/linux/archive/${COMMIT_ID}.tar.gz -O -  | tar zxf - -C ${HOME}
    cd linux-${COMMIT_ID}
    
  4. Makefile 編集。4行目 EXTRAVERSION = -mybuild とかする

  5. カーネルビルド

    1. Raspberry Pi 1/Zero向け:

      RPi_0/1
      b1cnf && time b1 zImage modules dtbs -j9
      #
      b1 INSTALL_MOD_PATH=${HOME}/built/rootfs modules_install
      #
      KERNEL=kernel
      BOOTDIR=${HOME}/built/boot
      mkdir -p ${BOOTDIR}/overlays/
      cp arch/arm/boot/zImage ${BOOTDIR}/$KERNEL.img
      cp arch/arm/boot/dts/*.dtb ${BOOTDIR}
      cp arch/arm/boot/dts/overlays/*.dtb* ${BOOTDIR}/overlays/
      cp arch/arm/boot/dts/overlays/README ${BOOTDIR}/overlays/
      
    2. Raspberry Pi 2/3向け:

      RPi_2/3
      b2cnf && time b2 zImage modules dtbs -j9
      #
      b2 INSTALL_MOD_PATH=${HOME}/built/rootfs modules_install
      #
      KERNEL=kernel7
      BOOTDIR=${HOME}/built/boot
      mkdir -p ${BOOTDIR}/overlays/
      cp arch/arm/boot/zImage ${BOOTDIR}/$KERNEL.img
      cp arch/arm/boot/dts/*.dtb ${BOOTDIR}
      cp arch/arm/boot/dts/overlays/*.dtb* ${BOOTDIR}/overlays/
      cp arch/arm/boot/dts/overlays/README ${BOOTDIR}/overlays/
      
  6. ${HOME}/builtに生成物があるので、rootfsを、ext4のパーティションへ、bootをFATへ、うまくコピーして起動。

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