Hmm... from my log
May 5 10:05:07 kernel: UBIFS (ubi0:0): UBIFS: mounted UBI device 0, volume 0, name "rootfs_ubifs", R/O mode
May 5 10:05:07 kernel: UBIFS (ubi0:0): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
May 5 10:05:07 kernel: UBIFS (ubi0:0): FS...