[U-Boot] ubifsmount reports "Error reading superblock", but linux can mount FS

Alex Zeffertt azeffertt at cambridgesys.com
Wed Mar 7 15:42:43 CET 2012

Hi u-booters,

I have a short script in my u-boot environment which chooses which of
two ubifs partitions to boot
by attempting to read a release file in each one.

Unfortunately, after an unclean shutdown sometimes the ubifsmount
fails.  (By "unclean shutdown"
I mean that the board was power cycled while doing some low bandwidth logging.)

The strange thing is that Linux has no problem mounting the partition
as its root filesystem.  This is
very confusing because it looks like the ubifs implementation in
u-boot is just a copy of the one in Linux.

Has anyone else seen this problem?



PS My kernel is linux-3.0.0/armv5tel and the full u-boot trace is below:

> U-Boot 2011.06 (Feb 10 2012 - 12:29:06)
> OpenRD-Base
> SoC:   Kirkwood 88F6281_A1
> DRAM:  128 MiB
> NAND:  512 MiB
> *** Warning - bad CRC, using default environment
> In:    serial
> Out:   serial
> Err:   serial
> Net:   egiga0
> 88E6351 Initialized on egiga0
> Hit any key to stop autoboot:  0
> Creating 1 MTD partitions on "nand0":
> 0x000001000000-0x000010000000 : "mtd=2"
> UBI: attaching mtd1 to ubi0
> UBI: physical eraseblock size:   131072 bytes (128 KiB)
> UBI: logical eraseblock size:    126976 bytes
> UBI: smallest flash I/O unit:    2048
> UBI: sub-page size:              512
> UBI: VID header offset:          2048 (aligned 2048)
> UBI: data offset:                4096
> UBI: attached mtd1 to ubi0
> UBI: MTD device name:            "mtd=2"
> UBI: MTD device size:            240 MiB
> UBI: number of good PEBs:        1913
> UBI: number of bad PEBs:         7
> UBI: max. allowed volumes:       128
> UBI: wear-leveling threshold:    4096
> UBI: number of internal volumes: 1
> UBI: number of user volumes:     1
> UBI: available PEBs:             0
> UBI: total number of reserved PEBs: 1913
> UBI: number of PEBs reserved for bad PEB handling: 19
> UBI: max/mean erase counter: 7/1
> UBIFS: recovery needed
> Error reading superblock on volume 'ubi:rootfs'!
> UBI: mtd1 is detached from ubi0

More information about the U-Boot mailing list