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。
那么我们就按照这个顺序进行分析
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
