1. 编译uboot emmc版本镜像

 a.进入uboot源代码目录后，执行以下操作:tar xf u-boot-2020.01.tar.bz2cd u-boot-2020.01patch -p1 < ../u-boot-2020.01.patchcp configs/ss928v100_defconfig .config(仅用于 spi nor/nand flash)(emmc启动时执行如下操作: cp configs/ss928v100_emmc_defconfig .config)(并口 nand 启动时执行如下操作：cp configs/ss928v100_nand_defconfig .config)make ARCH=arm CROSS_COMPILE=aarch64-mix210-linux- menuconfigmake ARCH=arm CROSS_COMPILE=aarch64-mix210-linux- -j 20Windows下进入到osdrv/tools/pc/uboot_tools/目录下打开对应单板的Excel文件,在main标签中点击\"Generate reg bin file\"按钮,生成reg_info.bin即为对应平台的表格文件。从tools/pc/uboot_tools目录拷贝reg_info.bin到boot源代码目录,重命名为.regcp ../../../osdrv/tools/pc/uboot_tools/reg_info.bin .regmake ARCH=arm CROSS_COMPILE=aarch64-mix210-linux- u-boot-z.binopen_source/uboot/u-boot-2020.01下生成的u-b