Re: AT91SAM9263-EK

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

On 17:06 Wed 18 Jul     , Sascha Hauer wrote:
> Hi Sven,
> 
> On Wed, Jul 18, 2012 at 11:44:29AM +0200, Stutz Sven wrote:
> > 
> > Hello Sascha,
> > 
> > thanks a lot for your help.
> > 
> > When I completely switch off the ecc, Barebox is loading the Linux kernel.
> > But I guess that the ecc is necessary especially for NAND-Flash devices.
> 
> Indeed. You shouldn't use NAND without ecc.
> 
> > 
> > 
> > The AT91SAM9263 controller has a ecc unit implemented. There are
> > three registers and the error calculation is done automatically,
> > only the error correction must be done in software.
> > Or is it better to you use the software ecc and I should try to fix
> > the software problem?
> 
> If possible you should use hardware ecc. It may be though that it has
> bugs that force you to use software ecc, but I'm not familiar with the
> atmel hardware.
the hw ecc work on 9263 but we do not use it on the kernel
> 
> > Can you give me some hints to fix this problem?
> 
> Does it work in the kernel? If yes, try looking for differences. The
> NAND layers are sufficiently similar.
the drivers as the same on both barebox and linux
> 
> > 
> > Btw. I have found the description table for the NAND devices. But
> > what would happen if I change the connections between the controller
> > and the NAND-Flash, where are those port description stored or the
> > timings to access the data bus?
smc

Best Regards,
J.

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