1、安装cfdisk

opkg install cfdisk

分区完 增加一个sda3 然后

uci add fstab mount

uci set fstab.@mount[-1].uuid=   \\填UUID

uci set fstab.@mount[-1].options=rw,sync,noatime

uci set fstab.@mount[-1].fstype=ext4

uci set fstab.@mount[-1].enabled_fsck=1

uci set fstab.@mount[-1].enabled=1

uci set fstab.@mount[-1].target=/

uci set fstab.@mount[-1].device=/dev/sda3

uci commit fstab

mkdir /mnt/sda3

mount /dev/sda3 /mnt/sda3

mkdir -p /tmp/cproot

mount --bind / /tmp/cproot

tar -C /tmp/cproot -cvf - . | tar -C /mnt/sda3 -xf -

umount /tmp/cproot

umount /mnt/sda3

/etc/init.d/fstab enable

/etc/init.d/fstab start