UBIFS reboots issue

[Boaz Ben-David]

I'm sorry for changing the thread subject in the previous mail..

I guess it sums up to one main question (and I would be very greatful if
someone could answer):

	Overall, for use on MLC NAND, is UBIFS or JFFS2 more suitable?
	From what I understand, JFFS2 doesn't do wear-leveling very
	good which will shorten the flash lifetime, but on the other
	hand, as Artem said and is written in the UBIFS web-site, UBIFS
	needs some work to be used on MLC. 

On another note, I would like to also try yaffs2 but I can't get it to
work (can't seem to create any files). Does anyone has any experience
using it on the Freescale iMX35 PDK?

Thanks.



On Fri, 2010-12-24 at 12:40 +0200, Boaz Ben-David wrote:
> I would very much want to try yaffs2. I cloned the git repo and patched my kernel using the script provided
> with the yaffs code. The kernel compiled with no errors but after I mounted a yaffs partition I could not create any new files on it.
> Each time I try to create a file on the partition I get "cannot allocate memory",,,
> I haven't had much time to investigate this so if anyone has any idea why this is happening, this is also a very good direction for me to go with (using yaffs).
> ________________________________________
> From: ZHOU Zhongjun [Zhongjun.Zhou at alcatel-sbell.com.cn]
> Sent: Friday, December 24, 2010 5:23 AM
> To: Boaz Ben-David; linux-mtd at lists.infradead.org
> Subject: RE: UBIFS reboots issue
> 
> Why do you not to use YAFFS2 for NAND flash?  It seems that Yaffs2 is more popularity.
> 
> 
> -----Original Message-----
> From: linux-mtd-bounces at lists.infradead.org [mailto:linux-mtd-bounces at lists.infradead.org] On Behalf Of Boaz Ben-David
> Sent: Thursday, December 23, 2010 8:52 PM
> To: linux-mtd at lists.infradead.org
> Subject: Re: UBIFS reboots issue
> 
> 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)
> >
> 
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