[U-Boot] NAND ECC Error with wrong SMC ording bug

Feng Kan fkan at amcc.com
Fri Aug 21 09:42:42 EST 2009

Hi Stefan:

We had a board with high number of correctable ECC errors. Which crashed 
the jffs when it
was miss correcting the wrong byte location.

Do you want me to submit a patch for this, or do you prefer to do it. I 
am submitting a patch
for linux right now.

Feng Kan
AMCC Software

On 08/19/2009 10:01 PM, Stefan Roese wrote:
> On Thursday 20 August 2009 06:38:51 Sean MacLennan wrote:
>>> I see other boards using SMC as well, can someone comment on the
>>> change I am proposing.
>>> Should I change the correction algorithm or the calculate function?
>>> If the later is preferred
>>> it would mean the change must be pushed in both U-Boot and Linux.
>> Odds are the calculate function is wrong. The correction algo is used
>> by many nand drivers, I *assume* it is correct. The calculate function
>> was set to agree with u-boot (1.3.0).
> Yes, it seems that you changed the order in the calculation function while
> reworking the NDFC driver for arch/powerpc. So we should probably change this
> order back to the original version. And change it in U-Boot as well.
> BTW: I didn't see any problems with ECC so far with the current code. Feng,
> how did you spot this problem?
> Cheers,
> Stefan
> --
> DENX Software Engineering GmbH,      MD: Wolfgang Denk&  Detlev Zundel
> HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-0 Fax: (+49)-8142-66989-80 Email: office at denx.de

More information about the Linuxppc-dev mailing list