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[ts-7000] Re: yaffs tragedy: no more eraased blocks

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Subject: [ts-7000] Re: yaffs tragedy: no more eraased blocks
From: "j.chitte" <>
Date: Wed, 19 Aug 2009 11:44:21 -0000
--- In  "j.chitte" <> wrote:
>
> --- In  Eddie Dawydiuk <eddie@> wrote:
> >
> > Hello,
> > 
> > > 
> > >> Please keep in mind ts11 is the current
> > > shipping kernel, we have not released a ts12 kernel. 
> > > 
> > > Apologies, it is indeed the 2.4.26-ts11 kernel , IIRC it was shipped with 
> > > ts10 and we updated it to ts11.
> > > 
> > > I recent weeks I have been booting a 2.6 kernel via nfs for testing. but 
> > > without using or mounting the MTD fs. Root fs is also nfs.
> > > 
> > > Failure of this board has added urgency to getting a more reliable fs and 
> > > recent kernel to work. However this post-dates the total flash failure, 
> > > it is NOT the cause.
> > > 
> > > This situation has arisen solely using stock TS kernels.
> > 
> > We are interested to look into this further. Could you provide more 
> > information 
> > demonstrating how to reproduce this problem on our stock ts11 kernel?
> > 
> > -- 
> > Best Regards,
> > ________________________________________________________________
> >   Eddie Dawydiuk, Technologic Systems | voice:  (480) 837-5200
> >   16525 East Laser Drive              | fax:    (480) 837-5300
> >   Fountain Hills, AZ 85268            | web: www.embeddedARM.com
> >
> 
> Hi Eddie,
> 
> I'm not sure what you want me to provide. The board will still boot but I 
> only have console and it keeps spewing "yaffs tragedy" to that.
> 
> Other services (ssh ftp) as well as our software fail , presumable because 
> they need to write or change a file somehere.
> 
> I can boot it nfs to either ts11 or 2.6 
> 
> Since I don't really understand what conditions produce the bad block markage 
> I can only guess like you. I can't provide do steps 1,2,3 "happens every 
> time" bug report. Sorry.
> 
> I've given some background info on the usage the board has has and I'm 
> willing to post the output of any specifics you may want to request.
> 
> Last week, I wrote to Charles Manning and two other aleph1 contacts I'd 
> written to about the slow mount, I have not had any replies as yet. Maybe 
> they are shut down right now.
> 
> I'm a little hesitant to use ignoreBB until I have a strategy for detecting 
> the truly bad blocks. This fault itself will surely have produced some burn 
> out as fewer blocks were available. Some process needs to be run to prevent 
> arbitrary file errors occuring due to marking real bad blocks as good.
> 
> Please ask any questions about the history of the board or any command line 
> output you'd like see to pin this down.
> 
> best regards.
>

just found another yaffs2 bug that may account for significant lost of usable 
space.

http://www.aleph1.co.uk/lurker/message/20090810.031403.aebdb4f2.en.html

When the directory is NOT empty, I try to remove dir by "rmdir" 
command. Normal should return fail, but YAFFS return true. The files 
under this directory is lost, and the file space can not be free.





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