I.MX6 Android 5.1 快速合成系统-低调大师

I.MX6 Android 5.1 快速合成系统

2016-11-09 601
/****************************************************************************
 *                     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：
    1. 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
    2. 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" "$i" | tr -d '\n'; echo +; done; echo 0); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/boot.img" | tr " " +); img_blocksize=4224; twoblocks=$((img_blocksize * 2)); onepct=$(((((17301504 / 100) - 1) / img_blocksize + 1) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$((17301504 - reserve)); echo "$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 - 32768)) ]; 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=17128320 blocksize=4224 total=8189223 reserve=173184
    out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8189223 reserve=173184
    out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8189223 reserve=173184
    out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8191271 reserve=173184
    ----- 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" "$i" | tr -d '\n'; echo +; done; echo 0); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/recovery.img" | tr " " +); img_blocksize=4224; twoblocks=$((img_blocksize * 2)); onepct=$(((((17301504 / 100) - 1) / img_blocksize + 1) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$((17301504 - reserve)); echo "$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 - 32768)) ]; 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=17128320 blocksize=4224 total=8797484 reserve=173184
    out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8797484 reserve=173184
    out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8797484 reserve=173184
    out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8799532 reserve=173184
    ----- 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 -1 -S out/target/product/sabresd_6dq/root/file_contexts -l 374476800 -a system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system
    Creating filesystem with parameters:
        Size: 374476800
        Block size: 4096
        Blocks per group: 32768
        Inodes per group: 7632
        Inode size: 256
        Journal blocks: 1428
        Label: 
        Blocks: 91425
        Block groups: 3
        Reserved block group size: 23
    Created filesystem with 1304/22896 inodes and 79090/91425 blocks
    Running:  mkuserimg.sh -s out/target/product/sabresd_6dq/system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img ext4 system 374476800 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 374476800 /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 0: type 0 start 0 len 7274506
    chunk 1: type 2 start 7274506 len 1480704
    chunk 2: type 0 start 8142159 len 49112
    Construct patches for 3 chunks...
    patch   0 is 205 bytes (of 7274506)
    patch   1 is 435259 bytes (of 867653)
    patch   2 is 594 bytes (of 49112)
    chunk   0: normal   (         0,    7274506)         205
    chunk   1: deflate  (   7274506,    1476108)      435259  (null)
    chunk   2: normal   (   8750614,      48918)         594
    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=385389312 blocksize=4224 total=323391834 reserve=3894528

    #### make completed successfully (53:14 (mm:ss)) ####

三、Android 5.1 生成内核信息解析：
    1. 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
    2. 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
    3. 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：
    1. 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" "$i" | tr -d '\n'; echo +; done; echo 0); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/boot.img" | tr " " +); img_blocksize=4224; twoblocks=$((img_blocksize * 2)); onepct=$(((((17301504 / 100) - 1) / img_blocksize + 1) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$((17301504 - reserve)); echo "$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 - 32768)) ]; 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=17128320 blocksize=4224 total=8189223 reserve=173184
        out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8189223 reserve=173184
        out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8189223 reserve=173184
        out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8191271 reserve=173184
    2. 由上可知，ramdisk合成没有给出信息：
        1. 参考文档：
            1. ramdisk.img及boot.img的生成过程
                http://blog.csdn.net/zhijianjingling00/article/details/16841683
            2. 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)"
                ......
            3. 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
    2. 整理并解读代码如下：
        # for循环迭代以下四种情况：
        #      1. dtsplat：imx6q:imx6q-sabresd.dtb
        #      2. dtsplat：imx6dl:imx6dl-sabresd.dtb
        #      3. dtsplat：imx6q-ldo:imx6q-sabresd-ldo.dtb
        #      4. 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：
            #     1. imx6q；
            #     2. imx6dl；
            #     3. imx6q-ldo；
            #     4. 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：
            #     1. imx6q-sabresd.dtb；
            #     2. imx6dl-sabresd.dtb；
            #     3. imx6q-sabresd-ldo.dtb；
            #     4. 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" "$i" | tr -d '\n'; 
                        echo +; 
                    done; 
                    echo 0
                ); 
            total=$(( $( echo "$size" ) )); 
            printname=$(echo -n "out/target/product/sabresd_6dq/boot.img" | tr " " +); 
            img_blocksize=4224; 
            twoblocks=$((img_blocksize * 2)); 
            onepct=$(((((17301504 / 100) - 1) / img_blocksize + 1) * img_blocksize)); 
            reserve=$((twoblocks > onepct ? twoblocks : onepct)); 
            maxsize=$((17301504 - reserve)); 
            echo "$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 - 32768)) ]; 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
    3. 和上面的shell脚本对比，输出信息正常：
        out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8189223 reserve=173184
        out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8189223 reserve=173184
        out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8189223 reserve=173184
        out/target/product/sabresd_6dq/boot.img maxsize=17128320 blocksize=4224 total=8191271 reserve=173184

五、解读 Making recovery image ：
    1. 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" "$i" | tr -d '\n'; echo +; done; echo 0); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/recovery.img" | tr " " +); img_blocksize=4224; twoblocks=$((img_blocksize * 2)); onepct=$(((((17301504 / 100) - 1) / img_blocksize + 1) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$((17301504 - reserve)); echo "$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 - 32768)) ]; 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=17128320 blocksize=4224 total=8797484 reserve=173184
        out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8797484 reserve=173184
        out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8797484 reserve=173184
        out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8799532 reserve=173184
        ----- Made recovery image: out/target/product/sabresd_6dq/recovery.img --------
    2. 整理并解读代码如下：
        # for循环迭代以下四种情况：
        #      1. dtsplat：imx6q:imx6q-sabresd.dtb
        #      2. dtsplat：imx6dl:imx6dl-sabresd.dtb
        #      3. dtsplat：imx6q-ldo:imx6q-sabresd-ldo.dtb
        #      4. 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：
            #     1. imx6q；
            #     2. imx6dl；
            #     3. imx6q-ldo；
            #     4. 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：
            #     1. imx6q-sabresd.dtb；
            #     2. imx6dl-sabresd.dtb；
            #     3. imx6q-sabresd-ldo.dtb；
            #     4. 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 0
            ); 
            total=$(( $( echo "$size" ) )); 
            printname=$(echo -n "out/target/product/sabresd_6dq/recovery.img" | tr " " +); 
            img_blocksize=4224; 
            twoblocks=$((img_blocksize * 2)); 
            onepct=$(((((17301504 / 100) - 1) / img_blocksize + 1) * img_blocksize)); 
            reserve=$((twoblocks > onepct ? twoblocks : onepct)); 
            maxsize=$((17301504 - reserve)); 
            echo "$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 - 32768)) ]; 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
    3. 和上面的shell脚本对比，输出信息正常：
        out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8797484 reserve=173184
        out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8797484 reserve=173184
        out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8797484 reserve=173184
        out/target/product/sabresd_6dq/recovery.img maxsize=17128320 blocksize=4224 total=8799532 reserve=173184

六、解读 Target system fs image：
    1. 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 -1 -S out/target/product/sabresd_6dq/root/file_contexts -l 374476800 -a system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system
        Creating filesystem with parameters:
            Size: 374476800
            Block size: 4096
            Blocks per group: 32768
            Inodes per group: 7632
            Inode size: 256
            Journal blocks: 1428
            Label: 
            Blocks: 91425
            Block groups: 3
            Reserved block group size: 23
        Created filesystem with 1304/22896 inodes and 79090/91425 blocks
        Running:  mkuserimg.sh -s out/target/product/sabresd_6dq/system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img ext4 system 374476800 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 374476800 /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 0: type 0 start 0 len 7274506
        chunk 1: type 2 start 7274506 len 1480704
        chunk 2: type 0 start 8142159 len 49112
        Construct patches for 3 chunks...
        patch   0 is 205 bytes (of 7274506)
        patch   1 is 435259 bytes (of 867653)
        patch   2 is 594 bytes (of 49112)
        chunk   0: normal   (         0,    7274506)         205
        chunk   1: deflate  (   7274506,    1476108)      435259  (null)
        chunk   2: normal   (   8750614,      48918)         594
        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=385389312 blocksize=4224 total=323391834 reserve=3894528

        #### make completed successfully (53:14 (mm:ss)) ####
    2. 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。
    3. 为了看到整个程序执行信息，修改源代码：
        1. 参考文档：
            1. 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
            2. Android编译系统分析五：system.img的生成过程
                http://blog.csdn.net/u011913612/article/details/52503318
            3. Android系统镜像文件的打包过程分析
                http://blog.csdn.net/Luoshengyang/article/details/20501657
        2. 修改build/core/definitions.mk
            ......
            define copy-file-to-target
            @mkdir -p $(dir $@)
            $(hide) $(ACP) -fp $< $@            # 移除前面的"$(hide)"
            endef
            ......
        3. 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: $(INSTALLED_SYSTEMIMAGE)
            ......
    4. 隐藏的处理信息如下：
        Install system fs image: out/target/product/sabresd_6dq/system.img
        out/host/linux-x86/bin/acp -fp out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system.img
        size=$(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" "$i" | tr -d '\n'; echo +; done; echo 0); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/system.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p" | tr " " +); img_blocksize=4224; twoblocks=$((img_blocksize * 2)); onepct=$(((((389283840 / 100) - 1) / img_blocksize + 1) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$((389283840 - reserve)); echo "$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 - 32768)) ]; then echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)"; fi 
        out/target/product/sabresd_6dq/system.img+out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p maxsize=385389312 blocksize=4224 total=323391834 reserve=3894528
        # @   size=$(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" "$i" | tr -d '\n'; echo +; done; echo 0); total=$(( $( echo "$size" ) )); printname=$(echo -n "out/target/product/sabresd_6dq/system.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p" | tr " " +); img_blocksize=4224; twoblocks=$((img_blocksize * 2)); onepct=$(((((389283840 / 100) - 1) / img_blocksize + 1) * img_blocksize)); reserve=$((twoblocks > onepct ? twoblocks : onepct)); maxsize=$((389283840 - reserve)); echo "$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 - 32768)) ]; then echo "WARNING: $printname approaching size limit ($total now; limit $maxsize)"; fi 

        #### make completed successfully (52:35 (mm:ss)) ####
    5. 整理并解读代码如下：
        1. 制作ext4fs文件系统：
            make_ext4fs -s -T -1 -S out/target/product/sabresd_6dq/root/file_contexts -l 374476800 -a system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system
        2. 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 374476800 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 374476800 /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:$PATH 
            out/host/linux-x86/bin/imgdiff out/target/product/sabresd_6dq/boot.img out/target/product/sabresd_6dq/recovery.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p
        3. 隐藏信息解读：
            # 直接将前面声场的system.img文件拷贝到输出目录中
            out/host/linux-x86/bin/acp -fp out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system.img
            # 统计两个文件的大小，并判断system.img文件是否正常，和前面类似，其实没有过多的解析必要
            size=$(
                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" "$i" | tr -d '\n'; 
                    echo +; 
                done; 
                echo 0
            ); 
            total=$(( $( echo "$size" ) )); 
            # 将两个文件中的空格换成+号
            printname=$(echo -n "out/target/product/sabresd_6dq/system.img out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/recovery_from_boot.p" | tr " " +); 
            img_blocksize=4224; 
            twoblocks=$((img_blocksize * 2)); 
            onepct=$(((((389283840 / 100) - 1) / img_blocksize + 1) * img_blocksize)); 
            reserve=$((twoblocks > onepct ? twoblocks : onepct)); 
            maxsize=$((389283840 - reserve)); 
            echo "$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 - 32768)) ]; 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 2>&1 | tee build-log.txt
    
    
    if [ $# != 1 ]; 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 -1
    fi
    
    # for U-Boot compile
    if [ $1 = "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 0
    fi
    
    # for boot.img compile
    if [ $1 = "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 0
    fi
    
    # for system.img repack
    if [ $1 = "fs" ]; then
        make_ext4fs -s -T -1 -S out/target/product/sabresd_6dq/root/file_contexts -l 374476800 -a system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img out/target/product/sabresd_6dq/system
        mkuserimg.sh -s out/target/product/sabresd_6dq/system out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img ext4 system 374476800 out/target/product/sabresd_6dq/root/file_contexts
        mkdir -p /tmp/tmpMr__Ct_verity_images
        build_verity_tree -A aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img
        system/extras/verity/build_verity_metadata.py 374476800 /tmp/tmpMr__Ct_verity_images/verity_metadata.img c05456d1171333727af2a3f82feb59856e56229fe81c75c90fd2a1359893a438 aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 /dev/block/mmcblk3p5 out/host/linux-x86/bin/verity_signer build/target/product/security/verity.pk8
        append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity_metadata.img
        append2simg out/target/product/sabresd_6dq/obj/PACKAGING/systemimage_intermediates/system.img /tmp/tmpMr__Ct_verity_images/verity.img
        mkdir -p out/target/product/sabresd_6dq/obj/PACKAGING/recovery_patch_intermediates/
        PATH=out/host/linux-x86/bin:$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 0
    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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