How to boot uSomIQ from NAND with UBIFS

References:

1) Prepare the UBIFS partiotion

ubiformat /dev/mtd7 -s 2048 -O 2048
ubiattach /dev/ubi_ctrl -m 7 -O 2048
ubimkvol /dev/ubi0 -s 235MiB -N rootfs
mount -t ubifs ubi0:rootfs /mnt

2) install a root file system to /mnt directory and sync disks.

U-boot does not need to change any environment variables to boot from NAND