UBIFS reboots issue

[Boaz Ben-David]

I am using kernel 2.6.31 for iMX35 and I'm not sure what version of
UBIFS is patched in there.
What do I need to do in order to patch to the latest version? 
Is is enough to clone UBIFS 2.6.31 and copy over the fs/ubifs and
mtd/ubi directories or are there any other directories I need to take
into account?

Thanks,

Boaz.

On Wed, 2010-12-22 at 22:20 +0200, Artem Bityutskiy wrote:
> On Wed, 2010-12-22 at 16:36 +0200, Boaz Ben-David wrote:
> > Hi all,
> > 
> > We have an embedded system using a Samsung 2GB MLC NAND and are using
> > UBIFS as the file system on it.
> > I have a question regarding UBIFS and hard reboots.
> > After some work with the flash (doing reads and writes to it), some
> > times one of our partitions would fail to mount.
> > I suspected this has something to do with a reboot which happens during
> > a write to the flash.
> > In order to test this I created a simple script which copies a file from
> > to the partition, syncs, then deletes it and does this repeatedly until 
> > a hard reboot occurs (using the watch dog to cause the boot).
> > This process repeats itself until the partition fails to mount.
> > When I performed the test mentioned above, after about 3-4 times the
> > partition would fail.
> > I am not sure if this behaviour is normal or not.
> > Did someone encounter similiar behaviour?
> 
> Just curious, did you see this:
> 
> http://linux-mtd.infradead.org/faq/ubifs.html#L_ubifs_mlc
> 
> I do not think you can just use UBI/UBIFS on MLC as is, you'd need to
> make sure MLC-specific behavior is handled properly.
> 
> -- 
> Best Regards,
> Artem Bityutskiy (Битюцкий Артём)
>