ubi_extract.txt

# $UBIFS is ubifs image file
# make sure $IMAGE is a ubifs image file
blkid $(IMAGE)
  $(IMAGE): ... TYPE="ubifs"

# size of created mtd is 256.0 MiB
modprobe nandsim first_id_byte=0x2c second_id_byte=0xda third_id_byte=0x90 fourth_id_byte=0x95
flash_erase /dev/mtd0 0 0
ubiformat /dev/mtd0 -s 2048 -O 2048
modprobe ubi
ubiattach -m 0 -d 0 -O 2048
# set $(SIZE) to value more than size of the ubifs filesystem
ubimkvol /dev/ubi0 -N volname -s $(SIZE)
ubiupdatevol /dev/ubi0_0 $(UBIFS)
mount /dev/ubi0_0 /mnt

# (taken from: http://lists.infradead.org/pipermail/linux-mtd/2013-October/049229.html )