备份整个emmc：dd if=/dev/mmcblk0 of=/mnt/mmcblk1p1/hi3798mv100_emmc_backup.img
备份fastboot：dd if=/dev/mmcblk0p1 of=/mnt/mmcblk1p1/hi3798mv100_fastboot_backup.img
备份bootargs：dd if=/dev/mmcblk0p2 of=/mnt/mmcblk1p1/hi3798mv100_bootargs_backup.img
备份kernel：dd if=/dev/mmcblk0p3 of=/mnt/mmcblk1p1/hi3798mv100_kernel_backup.img
备份rootfs：dd if=/dev/mmcblk0p4 of=/mnt/mmcblk1p1/hi3798mv100_rootfs_backup.img
备份backup：dd if=/dev/mmcblk0p5 of=/mnt/mmcblk1p1/hi3798mv100_backup_backup.img
备份ubuntu：dd if=/dev/mmcblk0p6 of=/mnt/mmcblk1p1/hi3798mv100_ubuntu_backup.img
