post-image.sh hacking

时间：2025-05-05 12:38:14
#*********************************************************************************

#*                      post-image.sh hacking

#* 说明：

#*     分析i.MX6 post-images.sh合成SD card工作原理。

#*

#*                                              -- 深圳 宝安西乡 曾剑锋

#********************************************************************************/

# 一、参考文档：

#    . Linux mktemp命令

#        http://www.runoob.com/linux/linux-comm-mktemp.html

#    . Genimage - The Image Creation Tool

#        https://github.com/pengutronix/genimage

#!/usr/bin/env bash

#

# dtb_list extracts the list of DTB files from BR2_LINUX_KERNEL_INTREE_DTS_NAME

# in ${BR_CONFIG}, then prints the corresponding list of file names for the

# genimage configuration file

#

dtb_list()

{

    local DTB_LIST="$(sed -n 's/^BR2_LINUX_KERNEL_INTREE_DTS_NAME="\([a-z0- \-]*\)"$/\1/p' ${BR2_CONFIG})"

    for dt in $DTB_LIST; do

        echo -n "\"$dt.dtb\", "

    done

}

#

# linux_image extracts the Linux image format from BR2_LINUX_KERNEL_UIMAGE in

# ${BR_CONFIG}, then prints the corresponding file name for the genimage

# configuration file

#

linux_image()

{

    if grep -Eq "^BR2_LINUX_KERNEL_UIMAGE=y$" ${BR2_CONFIG}; then

        echo "\"uImage\""

    else

        echo "\"zImage\""

    fi

}

main()

{

    # 获取dtb和linux image

    local FILES="$(dtb_list) $(linux_image)"

    # 创建配置文件文件

    local GENIMAGE_CFG="$(mktemp --suffix genimage.cfg)"

    local GENIMAGE_TMP="${BUILD_DIR}/genimage.tmp"

    # 替换掉cfg模板文件中的FILES字段

    sed -e "s/%FILES%/${FILES}/" \

        board/freescale/common/imx/genimage.cfg.template > ${GENIMAGE_CFG}

    # 可能存在上次的暂存目录，删除

    rm -rf "${GENIMAGE_TMP}"

    #

    # outputpath: default: images Mandatory path where all images are written to (must exist).

    # inputpath:  default: input This mandatory path is searched for input images, for example bootloader binaries, kernel images (must exist).

    # rootpath:   default: root Mandatory path to the root filesystem (must exist).

    # tmppath:    default: tmp Optional path to a temporary directory. There must be enough space available here to hold a copy of the root filesystem.

    # config:     default: genimage.cfg Path to the genimage config file.

    #

    # ${TARGET_DIR} = /home/zengjf/zengjf/Buildroot/buildroot/output/target

    # ${GENIMAGE_TMP} = /home/zengjf/zengjf/Buildroot/buildroot/output/build/genimage.tmp

    # ${BINARIES_DIR} = /home/zengjf/zengjf/Buildroot/buildroot/output/images

    # ${BINARIES_DIR} = /home/zengjf/zengjf/Buildroot/buildroot/output/images

    # ${GENIMAGE_CFG} = /tmp/tmp.1Kks4kDC5mgenimage.cfg

    #

    genimage \

        --rootpath "${TARGET_DIR}" \

        --tmppath "${GENIMAGE_TMP}" \

        --inputpath "${BINARIES_DIR}" \

        --outputpath "${BINARIES_DIR}" \

        --config "${GENIMAGE_CFG}"

    // 删除配置文件

    rm -f ${GENIMAGE_CFG}

    exit $?

}

main $@

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