Sample workflow to mount UBI files to local directory

mount.sh

sudo modprobe -r ubi
sudo modprobe -r mtdram
sudo modprobe nandsim first_id_byte=0x20 second_id_byte=0xaa third_id_byte=0x00 fourth_id_byte=0x15 total_size=40000
cat /proc/mtd
#     dev:    size   erasesize  name
#     mtd0: 10000000 00020000 "NAND simulator partition 0"
sudo  flash_erase /dev/mtd0 0 0
#     Erasing 128 Kibyte @ ffe0000 -- 100 % complete 
sudo ubiformat /dev/mtd0 -f rootfs.ubi -e 0 -O 2048
#     ubiformat: mtd0 (nand), size 268435456 bytes (256.0 MiB), 2048 eraseblocks of 131072 bytes (128.0 KiB), min. I/O size 2048 bytes
#     libscan: scanning eraseblock 2047 -- 100 % complete  
#     ubiformat: 2048 eraseblocks are supposedly empty
#     ubiformat: use erase counter 0 for all eraseblocks
#     ubiformat: flashing eraseblock 304 -- 100 % complete  
#     ubiformat: formatting eraseblock 2047 -- 100 % complete  
sudo modprobe ubi 
sudo ubiattach /dev/ubi_ctrl -m 0 -O 2048
#     UBI device number 0, total 2048 LEBs (260046848 bytes, 248.0 MiB), available 0 LEBs (0 bytes), LEB size 126976 bytes (124.0 KiB)
sudo mount -t ubifs /dev/ubi0_0 rootfs