mount_ubifs: failed to mount ubifs

[Richard Weinberger]

On Mon, Jun 29, 2015 at 7:03 AM, Bean Huo 霍斌斌 (beanhuo)
<beanhuo at micron.com> wrote:
> Hello:
> Currently ,I mainly focus on ubi powerloss solution for MLC nand ,now I
> Have a problem about master node, below is log.
>
> When PEB 354:4096 read failed,and ubi will regard this block a corrupted block.
> Ubi will not recover it, but reserve it.
> Maybe this block contains master node, so will mount failure?

UBI does not expect that a block turns bad/unreadable all of a sudden.

> Why ubi not try to recover such block?

How would it? If there is an ECC error UBI cannot do much.

The more interesting question is, why went it unreadable?
You said this is MLC nand, UBI was designed for SLC.
MLC is still unsupported, especially if you need to deal with powercuts.

As you work for Micron, it would be wonderful if you could give us more details
on the MLC nand and what Micron recommends to deal with that.

-- 
Thanks,
//richard