Linux系统编译生成镜像流程

编译内核

清除内核

命令

${MAKE} O= mrproper

示例

make CROSS_COMPILE=riscv32-unknown-linux- ARCH=riscv -j16 
O=kernel/build KERNEL_SRC=kernel/linux-5.4
INSTALL_MOD_PATH=kernel/staging O= mrproper

配置defconfig

命令

defconfig：${MAKE} defconfig KBUILD_DEFCONFIG=${LICHEE_KERN_DEFCONF_RELATIVE}

示例

make CROSS_COMPILE=nds32le-linux-glibc-v5d/bin/riscv32-unknown-linux- ARCH=riscv -j16 
O=kernel/build KERNEL_SRC=kernel/linux-5.4
INSTALL_MOD_PATH=kernel/staging defconfig
KBUILD_DEFCONFIG=linux-5.4/xxx_defconfig

编译

${MAKE} $MAKE_ARGS

示例

MAKE_ARGS+=' INSTALL_HDR_PATH=kernel/build/user_headers headers_install'
$COMP_TYPE = Image.bz2/Image.lz4  根据LICHEE_COMPRESS是bzip2,gzip等。这里的rv选择的是Image.gz
MAKE_ARGS+$COMP_TYPE

make CROSS_COMPILE=nds32le-linux-glibc-v5d/bin/riscv32-unknown-linux- ARCH=riscv -j16
O=kernel/build KERNEL_SRC=kernel/linux-5.4
INSTALL_MOD_PATH=kernel/staging modules all 
INSTALL_HDR_PATH=kernel/build/user_headers headers_install Image.gz

安装modules

命令

${MAKE} modules_install

示例

make CROSS_COMPILE=nds32le-linux-glibc-v5d/bin/riscv32-unknown-linux- ARCH=riscv -j16 
 O=kernel/build KERNEL_SRC=kernel/linux-5.4
 INSTALL_MOD_PATH=kernel/staging modules_install

额外编译

单独额外编译的模块

make CROSS_COMPILE=nds32le-linux-glibc-v5d/bin/riscv32-unknown-linux- ARCH=riscv -j16 
O=kernel/build KERNEL_SRC=kernel/linux-5.4
INSTALL_MOD_PATH=kernel/staging -C kernel/linux-5.4/xxx/modules/nand 
M=kernel/linux-5.4/xxx/modules/nand -j1

设备树

   cpp \
        -Wp,-MD,${dep}/.${outname}.d.pre.tmp \
        -nostdinc \
        -I ${LICHEE_KERN_DIR}/include \
        -I ${LICHEE_KERN_DIR}/bsp/include \
        -I ${die_dtsi_path} \
        -I ${chip_dtsi_path} \
        -undef \
        -D__DTS__ \
        -x assembler-with-cpp \
        -o ${dep}/.${outname}.dts.tmp \
        ${dtsfile}

    $DTC \
        -O dtb \
        -o ${outpath}/${outname} \
        -W no-unit_address_vs_reg \
        -W no-unit_address_format \
        -W no-unique_unit_address \
        -W no-graph_child_address \
        -W no-simple_bus_reg \
        -b 0 \
        -@ \
        -i ${LICHEE_CHIP_CONFIG_DIR}/configs/default/${LICHEE_KERN_VER} \
        -d ${dep}/.${outname}.d.dtc.tmp ${dep}/.${outname}.dts.tmp

示例

cpp -Wp,-MD,kernel/staging/dts_dep/.xxx.dtb.d.pre.tmp -nostdinc -I 
kernel/linux-5.4/include -I kernel/linux-5.4/bsp/include 
-I bsp/configs/linux-5.4 -I configs/default
 -undef -D__DTS__ -x assembler-with-cpp -o kernel/staging/dts_dep/.xxx.dtb.dts.tmp
 configs/perf2/board.dts


scripts/dtc/dtc -O dtb -o kernel/staging/xxx.dtb
 -W no-unit_address_vs_reg -W no-unit_address_format -W no-unique_unit_address -W no-graph_child_address -W no-simple_bus_reg -b 0 -@ -i
 configs/default/linux-5.4
 -d kernel/staging/dts_dep/.xxx.dtb.d.dtc.tmp
 kernel/staging/dts_dep/.xxx.dtb.dts.tmp

将内核与dtb打包生成img

  ${MKBOOTIMG} --kernel ${BIMAGE} \
        $(check_whether_use_ramdisk && echo "--ramdisk $RAMDISK") \
        --board ${CHIP}_${LICHEE_ARCH} \
        --base ${BASE} \
        --kernel_offset ${KERNEL_OFFSET} \
        $(check_whether_use_ramdisk && echo "--ramdisk_offset ${RAMDISK_OFFSET}") \
        --dtb ${DTB} \
        --dtb_offset ${DTB_OFFSET} \
        --header_version 2 \
        -o $STAGING_DIR/${IMAGE_NAME}

示例

tools/pack/pctools/linux/android/mkbootimg --kernel kernel/staging/Image.gz 
--board xxx300i_riscv32 --base 0x80000000 --kernel_offset 0x0 --dtb kernel/staging/sunxi.dtb
--dtb_offset 10485760 --header_version 2 -o kernel/staging/boot.img

根文件系统

制作根文件系统

    mksquashfs4 [rootfs-dir] [img-name] 
     -noappend：‌不将squashfs选项传递给内核
     -root-owned：‌设置root目录为root所有
     -comp xz：‌使用xz压缩算法
     -b 256k：‌设置块大小为256KB
     -p '/dev d 755 0 0' 和 -p '/dev/console c 600 0 0 5 1'：‌设置文件系统的权限和所有权。‌
     -processors 1：‌使用一个处理器进行压缩。‌

使用dd of生成rootfs.img

dd if=root.squashfs
 of=openwrt/rootfs.img bs=128k conv=sync

编译uboot

略

打包整个镜像

命令： dragonxx imagexx.cfg partitionxx.fex

使用打包工具dragonxx进行打包，其中image.cfg和partition.fex中的内容为要打包的文件。