UBIFS recovery fails

[Ricard Wanderlof]

On Mon, 17 Oct 2011, Artem Bityutskiy wrote:

> [...] Unfortunately, no one really invested time into making UBIFS 
> support MLC very well. It needs some more work. It also have some issues 
> related to unstable bits in modern SLC.
>
> In short - if you want to use UBIFS on MLC - you should not have unclean
> reboots. If you want to make UBIFS 100% uclean-reboot save on MLC - you
> need to work on it some more.
>
> We (the original authors) developed and tested it on very robust SLC
> NAND.

Do you have any specifics on what the issues are with MLC ?

Since UBI implements bit scrubbing and eraseblock torture on questionable 
blocks it would seem that a lot of the work has been done in order to 
handle unstable bits. Is there some issue which is related specifically to 
bit flips happening while the system is powered off?

/Ricard
-- 
Ricard Wolf Wanderlöf                           ricardw(at)axis.com
Axis Communications AB, Lund, Sweden            www.axis.com
Phone +46 46 272 2016                           Fax +46 46 13 61 30