Simulate MTD device

rmmod mtdram
# total_size:Total device size in KiB (ulong)
# erase_size: Device erase block size in KiB (ulong)
modprobe mtdram total_size=239616 erase_size=16

How to mount UBI image.

cat /proc/mtd
flash_erase /dev/mtd1 0 0
ubiformat /dev/mtd1 -f image.ubi
ubiattach -p /dev/mtd1
 
mount -t ubifs /dev/ubi0_0 /mnt/ubifs

flash_erase /dev/mtd1 0 0
ubiformat /dev/mtd1
modprobe ubi
ubiattach -m 1 -d 1
ubimkvol /dev/ubi1 -N rootfs -s 210MiB
ubiupdatevol /dev/ubi1_0 image.ubi
mount /dev/ubi1_0 /mnt