/****************************************************************************

 *                     I.MX6 Android 5.1 快速合成系统

 * 说明：

 *     Android源代码编译系统是一件很痛苦的事，主要是在修改了一些很小的东西，但

 * 要重新编译，要等很久才能编译完，如使用了mmm编译完，只是要打包一下system.img

 * 就行了，没必要去做那么多检查编译工作，所以这里跟一下系统合成原来，再精简

 * 一下，做一个快速合成系统的工具:a51m(shell 脚本)。

 *

 *                                         2016-11-10 深圳 南山平山村 曾剑锋

 ***************************************************************************/

                \\\\\\\\\\\\\\\\\-*-目录-*-//////////////////

                |  一、Android 5.1 生成U-Boot信息解析

                |  二、Android 5.1 完整生成img镜像信息

                |  三、Android 5.1 生成内核信息解析

                |  四、解读 Target boot image

                |  五、解读 Making recovery image

                |  六、解读 Target system fs image

                |  七、a51m脚本

                --------------------------------------------

一、Android 5.1 生成U-Boot信息解析：

    . 命令行输出信息如下：

        for ubootplat in imx6q:mx6qsabresdandroid_config imx6dl:mx6dlsabresdandroid_config imx6qp:mx6qpsabresdandroid_config; do \

                UBOOT_PLATFORM=`echo $ubootplat | cut -d':' -f1`; \

                UBOOT_CONFIG=`echo $ubootplat | cut -d':' -f2`; \

                echo ; \

                echo ; \

                make -C bootable/bootloader/uboot-imx/ distclean ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-; \

                make -C bootable/bootloader/uboot-imx/ $UBOOT_CONFIG ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-; \

                make -C bootable/bootloader/uboot-imx/ ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-; \

                install -D bootable/bootloader/uboot-imx/u-boot.imx out/target/product/sabresd_6dq/u-boot-$UBOOT_PLATFORM.imx; \

                install -D bootable/bootloader/uboot-imx/u-boot.imx out/target/product/sabresd_6dq/u-boot.imx; \

            done

    . 整理并解读代码如下：

        for ubootplat in imx6q:mx6qsabresdandroid_config imx6dl:mx6dlsabresdandroid_config imx6qp:mx6qpsabresdandroid_config; do

            # 获取平台类型

            UBOOT_PLATFORM=`echo $ubootplat | cut -d':' -f1`;

            # 获取配置文件名

            UBOOT_CONFIG=`echo $ubootplat | cut -d':' -f2`;

            echo ;

            echo ;

            # 清空之前的编译

            make -C bootable/bootloader/uboot-imx/ distclean ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-;

            # 重新配置

            make -C bootable/bootloader/uboot-imx/ $UBOOT_CONFIG ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-;

            # 编译

            make -C bootable/bootloader/uboot-imx/ ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-;

            # 拷贝

            install -D bootable/bootloader/uboot-imx/u-boot.imx out/target/product/sabresd_6dq/u-boot-$UBOOT_PLATFORM.imx;

            # 拷贝

            install -D bootable/bootloader/uboot-imx/u-boot.imx out/target/product/sabresd_6dq/u-boot.imx;

        done

二、Android 5.1 完整生成img镜像信息：

    Target ram disk: out/target/product/sabresd_6dq/ramdisk.img

    Target boot image: out/target/product/sabresd_6dq/boot.img

    for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do \

                    DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`; \

                    DTS_BOARD=`echo $dtsplat | cut -d':' -f2`; \

                    BOOT_IMAGE_BOARD=out/target/product/sabresd_6dq/boot-$DTS_PLATFORM.img; \

                    out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/sabresd_6dq/kernel --ramdisk out/target/product/sabresd_6dq/ramdisk.img --cmdline "console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=384M" --base 0x14000000 --second out/target/product/sabresd_6dq/$DTS_BOARD  --output out/target/product/sabresd_6dq/boot.img; \

            out/host/linux-x86/bin/boot_signer /boot out/target/product/sabresd_6dq/boot.img build/target/product/security/verity.pk8 build/target/product/security/verity.x509.pem out/target/product/sabresd_6dq/boot.img; \

                      size=$(for i in out/target/product/sabresd_6dq/boot.img; do stat --format "%s" "$i" | tr -d '\n'; echo +; done; echo ); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/boot.img" | tr " " +); img_blocksize=; twoblocks=$((img_blocksize * )); onepct=$((((( / ) - ) / img_blocksize + ) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$(( - reserve)); echo "$printname maxsize=$maxsize blocksize=$img_blocksize total=$total reserve=$reserve"; if [ "$total" -gt "$maxsize" ]; then echo "error: $printname too large ($total > [17301504 - $reserve])"; false; elif [ "$total" -gt $((maxsize - )) ]; then echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)"; fi ; \

                    cp -f out/target/product/sabresd_6dq/boot.img $BOOT_IMAGE_BOARD; \

            done

    out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

    out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

    out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

    out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

    ----- Making recovery image ------

    Copying baseline ramdisk...

    Modifying ramdisk contents...

    for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do \

            DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`; \

            DTS_BOARD=`echo $dtsplat | cut -d':' -f2`; \

            RECOVERY_IMAGE_BOARD=out/target/product/sabresd_6dq/recovery-$DTS_PLATFORM.img; \

            out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/sabresd_6dq/kernel  --ramdisk out/target/product/sabresd_6dq/ramdisk-recovery.img --cmdline "console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=384M" --base 0x14000000 --second out/target/product/sabresd_6dq/$DTS_BOARD  --output out/target/product/sabresd_6dq/recovery.img; \

            if [ true = true ]; then \

            out/host/linux-x86/bin/boot_signer /recovery out/target/product/sabresd_6dq/recovery.img build/target/product/security/verity.pk8 build/target/product/security/verity.x509.pem out/target/product/sabresd_6dq/recovery.img; \

            fi;\

              size=$(for i in out/target/product/sabresd_6dq/recovery.img; do stat --format "%s" "$i" | tr -d '\n'; echo +; done; echo ); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/recovery.img" | tr " " +); img_blocksize=; twoblocks=$((img_blocksize * )); onepct=$((((( / ) - ) / img_blocksize + ) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$(( - reserve)); echo "$printname maxsize=$maxsize blocksize=$img_blocksize total=$total reserve=$reserve"; if [ "$total" -gt "$maxsize" ]; then echo "error: $printname too large ($total > [17301504 - $reserve])"; false; elif [ "$total" -gt $((maxsize - )) ]; then echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)"; fi ; \

            cp -f out/target/product/sabresd_6dq/recovery.img $RECOVERY_IMAGE_BOARD; \

        done

    out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

    out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

    out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

    out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

    ----- Made recovery image: out/target/product/sabresd_6dq/recovery.img --------

    Installed file list: out/target/product/sabresd_6dq/installed-files.txt

    Target system fs image: out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img

    make_ext4fs -s -T - -S out/target/product/sabresd_6dq/root/file_contexts -l  -a system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system

    Creating filesystem with parameters:

        Size:

        Block size:

        Blocks per group:

        Inodes per group:

        Inode size:

        Journal blocks:

        Label:

        Blocks:

        Block groups:

        Reserved block group size:

    Created filesystem with / inodes and / blocks

    Running:  mkuserimg.sh -s out/target/product/sabresd_6dq/system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img ext4 system  out/target/product/sabresd_6dq/root/file_contexts

    build_verity_tree -A aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img

    system/extras/verity/build_verity_metadata.py  /tmp/tmpMr__Ct_verity_images/verity_metadata.img c05456d1171333727af2a3f82feb59856e56229fe81c75c90fd2a1359893a438 aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 /dev/block/mmcblk3p5 out/host/linux-x86/bin/verity_signer build/target/product/security/verity.pk8

    append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity_metadata.img

    append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img

    Construct recovery from boot

    mkdir -p out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/

    PATH=out/host/linux-x86/bin:$PATH

    out/host/linux-x86/bin/imgdiff out/target/product/sabresd_6dq/boot.img out/target/product/sabresd_6dq/recovery.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p

    chunk : type  start  len

    chunk : type  start  len

    chunk : type  start  len

    Construct patches for  chunks...

    patch    is  bytes (of )

    patch    is  bytes (of )

    patch    is  bytes (of )

    chunk   : normal   (         ,    )

    chunk   : deflate  (   ,    )        (null)

    chunk   : normal   (   ,      )

    Install system fs image: out/target/product/sabresd_6dq/system.img

    out/target/product/sabresd_6dq/system.img+out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p maxsize= blocksize= total= reserve=

    #### make completed successfully (: (mm:ss)) ####

三、Android 5.1 生成内核信息解析：

    . 命令行输出信息如下：

        Target ram disk: out/target/product/sabresd_6dq/ramdisk.img

        Target boot image: out/target/product/sabresd_6dq/boot.img

        install -D kernel_imx/arch/arm/boot/zImage  out/target/product/sabresd_6dq/kernel

        for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do \

                DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`; \

                DTS_BOARD=`echo $dtsplat | cut -d':' -f2`; \

                install -D kernel_imx/arch/arm/boot/dts/$DTS_BOARD out/target/product/sabresd_6dq/$DTS_BOARD; \

            done

        make -C kernel_imx modules ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi- LOADADDR=0x10008000

    . 整理并解读代码如下：

        for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do

            DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`;

            DTS_BOARD=`echo $dtsplat | cut -d':' -f2`;

            install -D kernel_imx/arch/arm/boot/dts/$DTS_BOARD out/target/product/sabresd_6dq/$DTS_BOARD;

        done

    . 由上可知out/target/product/sabresd_6dq/kernel是kernel_imx/arch/arm/boot/zImage文件，同时编译生成的dts在arch/arm/boot/dts目录下面。

四、解读 Target boot image：

    . 命令行输出信息如下：

        Target ram disk: out/target/product/sabresd_6dq/ramdisk.img

        Target boot image: out/target/product/sabresd_6dq/boot.img

        for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do \

                        DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`; \

                        DTS_BOARD=`echo $dtsplat | cut -d':' -f2`; \

                        BOOT_IMAGE_BOARD=out/target/product/sabresd_6dq/boot-$DTS_PLATFORM.img; \

                        out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/sabresd_6dq/kernel --ramdisk out/target/product/sabresd_6dq/ramdisk.img --cmdline "console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=384M" --base 0x14000000 --second out/target/product/sabresd_6dq/$DTS_BOARD  --output out/target/product/sabresd_6dq/boot.img; \

                out/host/linux-x86/bin/boot_signer /boot out/target/product/sabresd_6dq/boot.img build/target/product/security/verity.pk8 build/target/product/security/verity.x509.pem out/target/product/sabresd_6dq/boot.img; \

                          size=$(for i in out/target/product/sabresd_6dq/boot.img; do stat --format "%s" "$i" | tr -d '\n'; echo +; done; echo ); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/boot.img" | tr " " +); img_blocksize=; twoblocks=$((img_blocksize * )); onepct=$((((( / ) - ) / img_blocksize + ) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$(( - reserve)); echo "$printname maxsize=$maxsize blocksize=$img_blocksize total=$total reserve=$reserve"; if [ "$total" -gt "$maxsize" ]; then echo "error: $printname too large ($total > [17301504 - $reserve])"; false; elif [ "$total" -gt $((maxsize - )) ]; then echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)"; fi ; \

                        cp -f out/target/product/sabresd_6dq/boot.img $BOOT_IMAGE_BOARD; \

                done

        out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

    . 由上可知，ramdisk合成没有给出信息：

        . 参考文档：

            . ramdisk.img及boot.img的生成过程

                http://blog.csdn.net/zhijianjingling00/article/details/16841683

            . 修改build/core/Makefile：

                ......

                # We just build this directly to the install location.

                INSTALLED_RAMDISK_TARGET := $(BUILT_RAMDISK_TARGET)

                $(INSTALLED_RAMDISK_TARGET): $(MKBOOTFS) $(INTERNAL_RAMDISK_FILES) | $(MINIGZIP)

                        $(call pretty,"Target ram disk: $@")

                        $(MKBOOTFS) $(TARGET_ROOT_OUT) | $(MINIGZIP) > $@    # 去掉前面的"$(hide)"

                ......

            . 得到输出信息：

                out/host/linux-x86/bin/mkbootfs out/target/product/sabresd_6dq/root | out/host/linux-x86/bin/minigzip > out/target/product/sabresd_6dq/ramdisk.img

    . 整理并解读代码如下：

        # for循环迭代以下四种情况：

        #      . dtsplat：imx6q:imx6q-sabresd.dtb

        #      . dtsplat：imx6dl:imx6dl-sabresd.dtb

        #      . dtsplat：imx6q-ldo:imx6q-sabresd-ldo.dtb

        #      . dtsplat：imx6qp:imx6qp-sabresd.dtb

        for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do

            # 截取dtsplat中的冒号前面的那部分字符，也就是：

            #     . imx6q；

            #     . imx6dl；

            #     . imx6q-ldo；

            #     . imx6qp；

            DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`;

            # 截取dtsplat中的冒号后面的那部分字符，也就是：

            #     . imx6q-sabresd.dtb；

            #     . imx6dl-sabresd.dtb；

            #     . imx6q-sabresd-ldo.dtb；

            #     . imx6qp-sabresd.dtb；

            DTS_BOARD=`echo $dtsplat | cut -d':' -f2`;

            # 合成当前次要生成的boot.img文件名

            BOOT_IMAGE_BOARD=out/target/product/sabresd_6dq/boot-$DTS_PLATFORM.img;

            # 使用mkbootimg合成boot.img文件，除了dts文件，其他的都是明确的

            out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/sabresd_6dq/kernel --ramdisk out/target/product/sabresd_6dq/ramdisk.img --cmdline "console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=384M" --base 0x14000000 --second out/target/product/sabresd_6dq/$DTS_BOARD  --output out/target/product/sabresd_6dq/boot.img;

            # 这里不是很明确到底要在做什么

            out/host/linux-x86/bin/boot_signer /boot out/target/product/sabresd_6dq/boot.img build/target/product/security/verity.pk8 build/target/product/security/verity.x509.pem out/target/product/sabresd_6dq/boot.img;

            # 接下来这段更多的是校验文件大小是否超出16M，

            size=$(

                    for i in out/target/product/sabresd_6dq/boot.img; do

                        stat --format "%s" "$i" | tr -d '\n';

                        echo +;

                    done;

                    echo

                );

            total=$(( $( echo "$size" ) ));

            printname=$(echo -n "out/target/product/sabresd_6dq/boot.img" | tr " " +);

            img_blocksize=;

            twoblocks=$((img_blocksize * ));

            onepct=$((((( / ) - ) / img_blocksize + ) * img_blocksize));

            reserve=$((twoblocks > onepct ? twoblocks : onepct));

            maxsize=$(( - reserve));

            echo "$printname maxsize=$maxsize blocksize=$img_blocksize total=$total reserve=$reserve";

            if [ "$total" -gt "$maxsize" ]; then

                echo "error: $printname too large ($total > [17301504 - $reserve])";

                false;

            elif [ "$total" -gt $((maxsize - )) ]; then

                echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)";

            fi ;

            # 以上检查都正常，拷贝文件

            cp -f out/target/product/sabresd_6dq/boot.img $BOOT_IMAGE_BOARD;

        done

    . 和上面的shell脚本对比，输出信息正常：

        out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/boot.img maxsize= blocksize= total= reserve=

五、解读 Making recovery image ：

    . 命令行输出信息如下：

        ----- Making recovery image ------

        Copying baseline ramdisk...

        Modifying ramdisk contents...

        for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do \

                DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`; \

                DTS_BOARD=`echo $dtsplat | cut -d':' -f2`; \

                RECOVERY_IMAGE_BOARD=out/target/product/sabresd_6dq/recovery-$DTS_PLATFORM.img; \

                out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/sabresd_6dq/kernel  --ramdisk out/target/product/sabresd_6dq/ramdisk-recovery.img --cmdline "console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=384M" --base 0x14000000 --second out/target/product/sabresd_6dq/$DTS_BOARD  --output out/target/product/sabresd_6dq/recovery.img; \

                if [ true = true ]; then \

                out/host/linux-x86/bin/boot_signer /recovery out/target/product/sabresd_6dq/recovery.img build/target/product/security/verity.pk8 build/target/product/security/verity.x509.pem out/target/product/sabresd_6dq/recovery.img; \

                fi;\

                  size=$(for i in out/target/product/sabresd_6dq/recovery.img; do stat --format "%s" "$i" | tr -d '\n'; echo +; done; echo ); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/recovery.img" | tr " " +); img_blocksize=; twoblocks=$((img_blocksize * )); onepct=$((((( / ) - ) / img_blocksize + ) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$(( - reserve)); echo "$printname maxsize=$maxsize blocksize=$img_blocksize total=$total reserve=$reserve"; if [ "$total" -gt "$maxsize" ]; then echo "error: $printname too large ($total > [17301504 - $reserve])"; false; elif [ "$total" -gt $((maxsize - )) ]; then echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)"; fi ; \

                cp -f out/target/product/sabresd_6dq/recovery.img $RECOVERY_IMAGE_BOARD; \

            done

        out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

        ----- Made recovery image: out/target/product/sabresd_6dq/recovery.img --------

    . 整理并解读代码如下：

        # for循环迭代以下四种情况：

        #      . dtsplat：imx6q:imx6q-sabresd.dtb

        #      . dtsplat：imx6dl:imx6dl-sabresd.dtb

        #      . dtsplat：imx6q-ldo:imx6q-sabresd-ldo.dtb

        #      . dtsplat：imx6qp:imx6qp-sabresd.dtb

        for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do

            # 截取dtsplat中的冒号前面的那部分字符，也就是：

            #     . imx6q；

            #     . imx6dl；

            #     . imx6q-ldo；

            #     . imx6qp；

            DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`;

            # 截取dtsplat中的冒号后面的那部分字符，也就是：

            #     . imx6q-sabresd.dtb；

            #     . imx6dl-sabresd.dtb；

            #     . imx6q-sabresd-ldo.dtb；

            #     . imx6qp-sabresd.dtb；

            DTS_BOARD=`echo $dtsplat | cut -d':' -f2`;

            # 合成当前次要生成的recovery.img文件名

            RECOVERY_IMAGE_BOARD=out/target/product/sabresd_6dq/recovery-$DTS_PLATFORM.img;

            # 使用mkbootimg合成recovery.img文件，除了dts文件，其他的都是明确的，请对比boot.img合成的命令，几乎一样

            # out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/sabresd_6dq/kernel --ramdisk out/target/product/sabresd_6dq/ramdisk.img --cmdline "console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=384M" --base 0x14000000 --second out/target/product/sabresd_6dq/$DTS_BOARD  --output out/target/product/sabresd_6dq/boot.img;

            out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/sabresd_6dq/kernel  --ramdisk out/target/product/sabresd_6dq/ramdisk-recovery.img --cmdline "console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=384M" --base 0x14000000 --second out/target/product/sabresd_6dq/$DTS_BOARD  --output out/target/product/sabresd_6dq/recovery.img;

            # 加入校验，这里不是很明确到底要在做什么

            if [ true = true ]; then

                out/host/linux-x86/bin/boot_signer /recovery out/target/product/sabresd_6dq/recovery.img build/target/product/security/verity.pk8 build/target/product/security/verity.x509.pem out/target/product/sabresd_6dq/recovery.img;

            fi;

            # 接下来这段更多的是校验文件大小是否超出16M，

            size=$(

                for i in out/target/product/sabresd_6dq/recovery.img; do

                    stat --format "%s" "$i" | tr -d '\n';

                    echo +;

                done;

                echo

            );

            total=$(( $( echo "$size" ) ));

            printname=$(echo -n "out/target/product/sabresd_6dq/recovery.img" | tr " " +);

            img_blocksize=;

            twoblocks=$((img_blocksize * ));

            onepct=$((((( / ) - ) / img_blocksize + ) * img_blocksize));

            reserve=$((twoblocks > onepct ? twoblocks : onepct));

            maxsize=$(( - reserve));

            echo "$printname maxsize=$maxsize blocksize=$img_blocksize total=$total reserve=$reserve";

            if [ "$total" -gt "$maxsize" ]; then

                echo "error: $printname too large ($total > [17301504 - $reserve])";

                false;

            elif [ "$total" -gt $((maxsize - )) ]; then

                echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)";

            fi ;

            # 以上检查都正常，拷贝文件

            cp -f out/target/product/sabresd_6dq/recovery.img $RECOVERY_IMAGE_BOARD;

        done

    . 和上面的shell脚本对比，输出信息正常：

        out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

        out/target/product/sabresd_6dq/recovery.img maxsize= blocksize= total= reserve=

六、解读 Target system fs image：

    . 命令行输出信息如下：

        Target system fs image: out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img

        make_ext4fs -s -T - -S out/target/product/sabresd_6dq/root/file_contexts -l  -a system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system

        Creating filesystem with parameters:

            Size:

            Block size:

            Blocks per group:

            Inodes per group:

            Inode size:

            Journal blocks:

            Label:

            Blocks:

            Block groups:

            Reserved block group size:

        Created filesystem with / inodes and / blocks

        Running:  mkuserimg.sh -s out/target/product/sabresd_6dq/system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img ext4 system  out/target/product/sabresd_6dq/root/file_contexts

        build_verity_tree -A aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img

        system/extras/verity/build_verity_metadata.py  /tmp/tmpMr__Ct_verity_images/verity_metadata.img c05456d1171333727af2a3f82feb59856e56229fe81c75c90fd2a1359893a438 aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 /dev/block/mmcblk3p5 out/host/linux-x86/bin/verity_signer build/target/product/security/verity.pk8

        append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity_metadata.img

        append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img

        Construct recovery from boot

        mkdir -p out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/

        PATH=out/host/linux-x86/bin:$PATH

        out/host/linux-x86/bin/imgdiff out/target/product/sabresd_6dq/boot.img out/target/product/sabresd_6dq/recovery.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p

        chunk : type  start  len

        chunk : type  start  len

        chunk : type  start  len

        Construct patches for  chunks...

        patch    is  bytes (of )

        patch    is  bytes (of )

        patch    is  bytes (of )

        chunk   : normal   (         ,    )

        chunk   : deflate  (   ,    )        (null)

        chunk   : normal   (   ,      )

        Install system fs image: out/target/product/sabresd_6dq/system.img

        out/target/product/sabresd_6dq/system.img+out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p maxsize= blocksize= total= reserve=

        #### make completed successfully (: (mm:ss)) ####

    . 如上可知，最后生成out/target/product/sabresd_6dq/system.img部分内容好像被隐藏了。

    . 为了看到整个程序执行信息，修改源代码：

        . 参考文档：

            . 参考文档：Android——编译体系中的【PRODUCT_COPY_FILES】【ALL_PREBUILT】【BUILD_PREBUILT】

                http://blog.csdn.net/jscese/article/details/40615801

            . Android编译系统分析五：system.img的生成过程

                http://blog.csdn.net/u011913612/article/details/52503318

            . Android系统镜像文件的打包过程分析

                http://blog.csdn.net/Luoshengyang/article/details/20501657

        . 修改build/core/definitions.mk

            ......

            define copy-file-to-target

            @mkdir -p $(dir $@)

            $(hide) $(ACP) -fp $< $@            # 移除前面的"$(hide)"

            endef

            ......

        . 修改build/core/Makefile

            ......

            INSTALLED_SYSTEMIMAGE := $(PRODUCT_OUT)/system.img

            ......

            systemimage_intermediates := \

            $(call intermediates-dir-for,PACKAGING,systemimage)

            BUILT_SYSTEMIMAGE := $(systemimage_intermediates)/system.img

            ......

            $(INSTALLED_SYSTEMIMAGE): $(BUILT_SYSTEMIMAGE) $(RECOVERY_FROM_BOOT_PATCH) | $(ACP)

                @echo "Install system fs image: $@"

                $(copy-file-to-target)

                # 为了看到这部分完整的处理流程，将"$(hide)"去掉

                # $(hide) $(call assert-max-image-size,$@ $(RECOVERY_FROM_BOOT_PATCH),$(BOARD_SYSTEMIMAGE_PARTITION_SIZE))

                $(call assert-max-image-size,$@ $(RECOVERY_FROM_BOOT_PATCH),$(BOARD_SYSTEMIMAGE_PARTITION_SIZE))

            systemimage: $(INSTALLED_SYSTEMIMAGE)

            ......

    . 隐藏的处理信息如下：

        Install system fs image: out/target/product/sabresd_6dq/system.img

        out/host/linux-x86/bin/acp -fp out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system.img

        size=$(for i in out/target/product/sabresd_6dq/system.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p; do stat --format "%s" "$i" | tr -d '\n'; echo +; done; echo ); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/system.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p" | tr " " +); img_blocksize=; twoblocks=$((img_blocksize * )); onepct=$((((( / ) - ) / img_blocksize + ) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$(( - reserve)); echo "$printname maxsize=$maxsize blocksize=$img_blocksize total=$total reserve=$reserve"; if [ "$total" -gt "$maxsize" ]; then echo "error: $printname too large ($total > [389283840 - $reserve])"; false; elif [ "$total" -gt $((maxsize - )) ]; then echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)"; fi

        out/target/product/sabresd_6dq/system.img+out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p maxsize= blocksize= total= reserve=

        # @   size=$(for i in out/target/product/sabresd_6dq/system.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p; do stat --format "%s" "$i" | tr -d '\n'; echo +; done; echo ); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/system.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p" | tr " " +); img_blocksize=; twoblocks=$((img_blocksize * )); onepct=$((((( / ) - ) / img_blocksize + ) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$(( - reserve)); echo "$printname maxsize=$maxsize blocksize=$img_blocksize total=$total reserve=$reserve"; if [ "$total" -gt "$maxsize" ]; then echo "error: $printname too large ($total > [389283840 - $reserve])"; false; elif [ "$total" -gt $((maxsize - )) ]; then echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)"; fi 

        #### make completed successfully (: (mm:ss)) ####

    . 整理并解读代码如下：

        . 制作ext4fs文件系统：

            make_ext4fs -s -T - -S out/target/product/sabresd_6dq/root/file_contexts -l  -a system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system

        . 以下步骤基本上是没什么变量，所以也就不解析了：

            mkuserimg.sh -s out/target/product/sabresd_6dq/system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img ext4 system  out/target/product/sabresd_6dq/root/file_contexts

            build_verity_tree -A aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img

            system/extras/verity/build_verity_metadata.py  /tmp/tmpMr__Ct_verity_images/verity_metadata.img c05456d1171333727af2a3f82feb59856e56229fe81c75c90fd2a1359893a438 aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 /dev/block/mmcblk3p5 out/host/linux-x86/bin/verity_signer build/target/product/security/verity.pk8

            append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity_metadata.img

            append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img

            mkdir -p out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/

            PATH=out/host/linux-x86/bin:$PATH

            out/host/linux-x86/bin/imgdiff out/target/product/sabresd_6dq/boot.img out/target/product/sabresd_6dq/recovery.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p

        . 隐藏信息解读：

            # 直接将前面声场的system.img文件拷贝到输出目录中

            out/host/linux-x86/bin/acp -fp out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system.img

            # 统计两个文件的大小，并判断system.img文件是否正常，和前面类似，其实没有过多的解析必要

            size=$(

                for i in out/target/product/sabresd_6dq/system.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p; do

                    stat --format "%s" "$i" | tr -d '\n';

                    echo +;

                done;

                echo

            );

            total=$(( $( echo "$size" ) ));

            # 将两个文件中的空格换成+号

            printname=$(echo -n "out/target/product/sabresd_6dq/system.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p" | tr " " +);

            img_blocksize=;

            twoblocks=$((img_blocksize * ));

            onepct=$((((( / ) - ) / img_blocksize + ) * img_blocksize));

            reserve=$((twoblocks > onepct ? twoblocks : onepct));

            maxsize=$(( - reserve));

            echo "$printname maxsize=$maxsize blocksize=$img_blocksize total=$total reserve=$reserve";

            if [ "$total" -gt "$maxsize" ]; then

                echo "error: $printname too large ($total > [389283840 - $reserve])";

                false;

            elif [ "$total" -gt $((maxsize - )) ]; then

                echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)";

            fi 

七、a51m脚本：

    #!/bin/bash

    # source build/envsetup.sh && lunch sabresd_6dq-user && make >& | tee build-log.txt

    if [ $# !=  ]; then

        echo "USAGE:"

        echo "    a51m <ub | bi | fs> "

        echo "        1. ub: U-Boot compile."

        echo "        2. bi: boot.img compile."

        echo "        3. fs: system.img repack"

        echo

        exit -

    fi

    # for U-Boot compile

    if [ $ = "ub" ]; then

        for ubootplat in imx6q:mx6qsabresdandroid_config imx6dl:mx6dlsabresdandroid_config imx6qp:mx6qpsabresdandroid_config; do

            UBOOT_PLATFORM=`echo $ubootplat | cut -d':' -f1`;

            UBOOT_CONFIG=`echo $ubootplat | cut -d':' -f2`;

            echo ;

            echo ;

            make -C bootable/bootloader/uboot-imx/ distclean ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-;

            make -C bootable/bootloader/uboot-imx/ $UBOOT_CONFIG ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-;

            make -C bootable/bootloader/uboot-imx/ ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-; 

            echo -e "\tcp bootable/bootloader/uboot-imx/u-boot.imx out/target/product/sabresd_6dq/u-boot-$UBOOT_PLATFORM.imx; "

            cp bootable/bootloader/uboot-imx/u-boot.imx out/target/product/sabresd_6dq/u-boot-$UBOOT_PLATFORM.imx;

        done

        echo -e "\n\033[32mGenerate u-boot.imx Work Over.\033[0m\n"

        exit

    fi

    # for boot.img compile

    if [ $ = "bi" ]; then

        make -C kernel_imx ARCH=arm CROSS_COMPILE=`pwd`/prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi- LOADADDR=0x10008000

        echo -e "\n\033[32m[Copy zImage file to target]:\033[0m"

        echo -e "\tcp kernel_imx/arch/arm/boot/zImage  out/target/product/sabresd_6dq/kernel"

        cp kernel_imx/arch/arm/boot/zImage  out/target/product/sabresd_6dq/kernel

        echo -e "\n\033[32m[Copy dtb file to target]:\033[0m"

        for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do

            DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`;

            DTS_BOARD=`echo $dtsplat | cut -d':' -f2`;

            echo -e "\tcp kernel_imx/arch/arm/boot/dts/$DTS_BOARD out/target/product/sabresd_6dq/$DTS_BOARD"

            cp kernel_imx/arch/arm/boot/dts/$DTS_BOARD out/target/product/sabresd_6dq/$DTS_BOARD;

        done

        echo -e "\n\033[32m[Generate ramdisk.img file to target]:\033[0m"

        echo -e "\tout/host/linux-x86/bin/mkbootfs out/target/product/sabresd_6dq/root | out/host/linux-x86/bin/minigzip > out/target/product/sabresd_6dq/ramdisk.img"

        out/host/linux-x86/bin/mkbootfs out/target/product/sabresd_6dq/root | out/host/linux-x86/bin/minigzip > out/target/product/sabresd_6dq/ramdisk.img

        echo -e "\n\033[32m[Generate boot.img file to target]:\033[0m"

        for dtsplat in imx6q:imx6q-sabresd.dtb imx6dl:imx6dl-sabresd.dtb imx6q-ldo:imx6q-sabresd-ldo.dtb imx6qp:imx6qp-sabresd.dtb; do

            DTS_PLATFORM=`echo $dtsplat | cut -d':' -f1`;

            DTS_BOARD=`echo $dtsplat | cut -d':' -f2`;

            BOOT_IMAGE_BOARD=out/target/product/sabresd_6dq/boot-$DTS_PLATFORM.img;

            out/host/linux-x86/bin/mkbootimg  --kernel out/target/product/sabresd_6dq/kernel --ramdisk out/target/product/sabresd_6dq/ramdisk.img --cmdline "console=ttymxc0,115200 init=/init video=mxcfb0:dev=ldb,bpp=32 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off vmalloc=256M androidboot.console=ttymxc0 consoleblank=0 androidboot.hardware=freescale cma=384M" --base 0x14000000 --second out/target/product/sabresd_6dq/$DTS_BOARD  --output out/target/product/sabresd_6dq/boot.img;

        out/host/linux-x86/bin/boot_signer /boot out/target/product/sabresd_6dq/boot.img build/target/product/security/verity.pk8 build/target/product/security/verity.x509.pem out/target/product/sabresd_6dq/boot.img;

            echo -e "\tcp -f out/target/product/sabresd_6dq/boot.img $BOOT_IMAGE_BOARD"

            cp -f out/target/product/sabresd_6dq/boot.img $BOOT_IMAGE_BOARD;

        done

        echo -e "\n\033[32mGenerate boot.img Work Over.\033[0m\n"

        exit

    fi

    # for system.img repack

    if [ $ = "fs" ]; then

        make_ext4fs -s -T - -S out/target/product/sabresd_6dq/root/file_contexts -l  -a system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system

        mkuserimg.sh -s out/target/product/sabresd_6dq/system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img ext4 system  out/target/product/sabresd_6dq/root/file_contexts

        mkdir -p /tmp/tmpMr__Ct_verity_images

        build_verity_tree -A aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img

        system/extras/verity/build_verity_metadata.py  /tmp/tmpMr__Ct_verity_images/verity_metadata.img c05456d1171333727af2a3f82feb59856e56229fe81c75c90fd2a1359893a438 aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 /dev/block/mmcblk3p5 out/host/linux-x86/bin/verity_signer build/target/product/security/verity.pk8

        append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity_metadata.img

        append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img

        mkdir -p out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/

        PATH=out/host/linux-x86/bin:$PATH

        out/host/linux-x86/bin/imgdiff out/target/product/sabresd_6dq/boot.img out/target/product/sabresd_6dq/recovery.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p

        out/host/linux-x86/bin/acp -fp out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system.img

        echo -e "\n\033[32mGenerate system.img Work Over.\033[0m\n"

        exit

    fi

    echo "USAGE:"

    echo "    a51m <ub | bi | fs> "

    echo "        1. ub: U-Boot compile."

    echo "        2. bi: boot.img compile."

    echo "        3. fs: system.img repack"

    echo

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