nanopi M4开发日记3：裸机开发--make.sh分析

上一篇我们完成了编译U-boot,得到了3个文件烧入后正常启动，编译u-boot使用的是Rockchip提供的make.sh脚本自动完成的编译，这一篇我们就来分析这个make.sh脚本

首先在make.sh的最前面定义的是全局变量,注意其中的rkbin和工具链的路径设置，是根据自己的开发环境修改的。 然后我们看整个make.sh的运行顺序，在脚本的最后

那么我们就按照这个顺序进行分析

首先第一个是prepare()，完成输出目录解析和--help命令解析以及根据默认配置文件生成.config文件 接着是select_toolchain(),完成了对应工具链的配置
接着是select_chip_info()，选择出芯片的信号信息
对于RK3399的编译fixup_platform_configure()只设定了输出img的大小

fixup_platform_configure()
{
    local count plat

# <*> Fixup rsa/sha pack mode for platforms 固定rsa/sha包（打包）模式的平台
    # RK3308/PX30/RK3326 use RSA-PKCS1 V2.1, it's pack magic is "3"
    if [ $RKCHIP = "PX30" -o $RKCHIP = "RK3326" -o $RKCHIP = "RK3308" ]; then       #RK3308/PX30/RK3326使用rsa 3
        PLATFORM_RSA="--rsa 3"
    # RK3368 use rk big endian SHA256, it's pack magic is "2"
    elif [ $RKCHIP = "RK3368" ]; then                                               #RK3368使用 sha 2
        PLATFORM_SHA="--sha 2"
    # other platforms use default configure
    fi

# <*> Fixup images size pack for platforms  为平台修正image大小包
    if [ $RKCHIP = "RK3308" ]; then
        if grep -q '^CONFIG_ARM64_BOOT_AARCH32=y' ${OUTDIR}/.config ; then          #.config中为# CONFIG_ARM64_BOOT_AARCH32 is not set
            PLATFORM_UBOOT_IMG_SIZE="--size 512 2"
            PLATFORM_TRUST_IMG_SIZE="--size 512 2"
        else                                                                        #rk3399配置如下
            PLATFORM_UBOOT_IMG_SIZE="--size 1024 2"
            PLATFORM_TRUST_IMG_SIZE="--size 1024 2"
        fi
    fi

# <*> Fixup PLATFORM_AARCH32 for ARM64 cpu platforms
    if [ $RKCHIP = "RK3308" ]; then                                                 #只有rk3308执行
        if grep -q '^CONFIG_ARM64_BOOT_AARCH32=y' ${OUTDIR}/.config ; then
            PLATFORM_AARCH32="AARCH32"
        fi
    fi
}

sub_commands()是用来处理其他命令和部分芯片的，rk3399不执行此函数，我们在此跳过
完成了工具链的配置以及在prepare()生成.config文件，接下来是进行unoot的编译

make CROSS_COMPILE=${TOOLCHAIN_GCC}  all --jobs=${JOB} ${OUTOPT}

最后是打包出3个烧入的文件
uboot的打包

pack_uboot_image()          
{
    local UBOOT_LOAD_ADDR

    UBOOT_LOAD_ADDR=`sed -n "/CONFIG_SYS_TEXT_BASE=/s/CONFIG_SYS_TEXT_BASE=//p" ${OUTDIR}/include/autoconf.mk|tr -d '\r'`   #UBOOT_LOAD_ADDR = 0x00200000,设置u-boot起始地址
    ${RKTOOLS}/loaderimage --pack --uboot ${OUTDIR}/u-boot.bin uboot.img ${UBOOT_LOAD_ADDR} ${PLATFORM_UBOOT_IMG_SIZE}      #调用loaderimage工具，讲u-boot.bin 打包成 uboot.img
#   ../rkbin/tools                          ./                                              PLATFORM_UBOOT_IMG_SIZE="--size 1024 2"
    # Delete u-boot.img and u-boot-dtb.img, which makes users not be confused with final uboot.img
    if [ -f ${OUTDIR}/u-boot.img ]; then        #删除u-boot.img
        rm ${OUTDIR}/u-boot.img
    fi

    if [ -f ${OUTDIR}/u-boot-dtb.img ]; then    #删除u-boot-dtb.img
        rm ${OUTDIR}/u-boot-dtb.img
    fi

    echo "pack uboot okay! Input: ${OUTDIR}/u-boot.bin"
}

loader的打包

pack_loader_image()
{
    local mode=$1 files ini

    if [ ! -f ${RKBIN}/RKBOOT/${RKCHIP_LOADER}MINIALL.ini ]; then       #对应MINIALL.ini不存在，退出并报错
        echo "pack loader failed! Can't find: ${RKBIN}/RKBOOT/${RKCHIP_LOADER}MINIALL.ini"
        return
    fi

    cd ${RKBIN}             #cd../rkbin

    if [ "${mode}" = 'all' ]; then                                  #$1==all
        files=`ls ${RKBIN}/RKBOOT/${RKCHIP_LOADER}MINIALL*.ini`
        for ini in $files
        do
            if [ -f "$ini" ]; then
                ${RKTOOLS}/boot_merger --replace tools/rk_tools/ ./ $ini
                echo "pack loader okay! Input: $ini"
            fi
        done
    else                                                            
        ${RKTOOLS}/boot_merger --replace tools/rk_tools/ ./ ${RKBIN}/RKBOOT/${RKCHIP_LOADER}MINIALL.ini     #使用boot_merger按照RK3399MINIALL.ini生成loader文件
        echo "pack loader okay! Input: ${RKBIN}/RKBOOT/${RKCHIP_LOADER}MINIALL.ini"
    fi

    cd - && mv ${RKBIN}/*_loader_*.bin ./
}

trust的打包

local TOS TOS_TA DARM_BASE TEE_LOAD_ADDR TEE_OFFSET=0x8400000

    # ARM64 uses trust_merger           #ARM64使用的trust_merger
    if grep -Eq ''^CONFIG_ARM64=y'|'^CONFIG_ARM64_BOOT_AARCH32=y'' ${OUTDIR}/.config ; then         
        if [ ! -f ${RKBIN}/RKTRUST/${RKCHIP_TRUST}${PLATFORM_AARCH32}TRUST.ini ]; then      #无法找到对应的TRUST.ini文件
            echo "pack trust failed! Can't find: ${RKBIN}/RKTRUST/${RKCHIP_TRUST}${PLATFORM_AARCH32}TRUST.ini"
            return
        fi

        cd ${RKBIN}
        ${RKTOOLS}/trust_merger ${PLATFORM_SHA} ${PLATFORM_RSA} ${PLATFORM_TRUST_IMG_SIZE} --replace tools/rk_tools/ ./ ${RKBIN}/RKTRUST/${RKCHIP_TRUST}${PLATFORM_AARCH32}TRUST.ini

        cd - && mv ${RKBIN}/trust.img ./trust.img
        echo "pack trust okay! Input: ${RKBIN}/RKTRUST/${RKCHIP_TRUST}${PLATFORM_AARCH32}TRUST.ini"
#后面是ARM32的trust打包，就不考虑了