New NAND interface

Thomas Gleixner tglx at
Tue May 11 04:53:00 EDT 2004

On Monday 10 May 2004 18:35, Simon Haynes wrote:
> On Monday 10 May 2004 4:32 pm, Thomas Gleixner wrote:
> > On Monday 10 May 2004 16:04, Simon Haynes wrote:
> > > I explained, recently, on #mtd, that jffs2 was generating bad crc
> >
> > Yep. I explained this in
> >
> Sorry, I should have looked at the archives. This makes it all clear to me.

No problem.

> > > moment I have fixed this in my NAND driver by specifying autooob with
> > > the useecc field set to 0.
> >
> > Sorry, I was not aware that you have a block driver for SM-FAT. Is this
> > driver available anywhere ?
> I have spoken to David about this and I am more than happy to provide the
> source to anyone. David, kindly, suggested I send the code to him and he
> would have a look before integrating it into the CVS system. I have not
> sent it to David as there are restrictions which would not make it suitable
> for all. I had planned to remove these and tidy things up but I just have
> not made the time.


> > > Firstly I am concerned that this might cause problems with other users
> > > of the NAND driver.  Is there cause for concern ?
> >
> > AFAIK, are JFFS2 and YAFFS the only clients of NAND driver, except your
> > SSFDC module.
> I guess JFFS2 and YAFFS will not bothered about my NAND driver doing auto
> placement as they have their own schemes ?

Yep. The decision is:

Use the caller provided scheme else use the default autoplacement scheme.

> > Secondly my SSFDC layer will only work with my NAND driver.
> > If you have more questions feel free to ask or let me have a look into
> > the code so I can give you more detailed hints.
> As I said, I will supply you the code but I do not expect you to support it
> and I do regard it as, incomplete, for gereral use.

In general I try to support every known NAND driver client. I would be 
interested to look into the SSFDC code also to help to fix it so it can be 
included in the source base.

> Thankyou for your support, again :-). At some time I will look into how I
> can change the SSFDC layer to interface properly to mtd/nand. As my frig
> seems to work for now I am inclined to go with it, unless you think this
> otherwise.



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