cat /proc/mtd

dev: size erasesize name
mtd0: 00100000 00020000 "uboot"
mtd1: 00020000 00020000 "dtb"
mtd2: 00500000 00020000 "kernel"
mtd3: 01e00000 00020000 "rootfs"
mtd4: 06200000 00020000 "mnt"

ls /dev/ubi

ubi0 ubi0_0 ubi_ctrl

df -h

Filesystem Size Used Available Use% Mounted on
ubi0:rootfs 22.4M 2.1M 20.3M 9% /
devtmpfs 26.4M 0 26.4M 0% /dev
tmpfs 26.9M 0 26.9M 0% /dev/shm
tmpfs 26.9M 20.0K 26.8M 0% /tmp
tmpfs 26.9M 16.0K 26.9M 0% /run
#

请教一下，我该如何挂载mnt分区呢？