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

Feng Kan
2009-08-20T23:42:50Z

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
>
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