4-bits ECC correction

[Danesh Daroui]

Thanks a lot for your answer.

Is there any document about how can we use software ECC with at least level 4 (4-bit ECC) or how it can be activated in the kernel? Also, is there any possible way to know what level of ECC is currently used by UBI/UBIFS or the NAND flash hardware itself?

What kind of incompatibility might occur? We are using quite old kernel (2.6.39.4) so would it be possible to use software ECC on this kernel as well or we need to update the kernel first (we prefer not at this stage)?

Thanks for your help,

Danesh


From: Richard Weinberger [mailto:richard.weinberger at gmail.com] 
Sent: den 19 juni 2017 16:50
To: Danesh Daroui <Danesh.Daroui at ascom.com>
Cc: linux-mtd at lists.infradead.org
Subject: Re: 4-bits ECC correction

Danesh,

On Monday, June 19, 2017, Danesh Daroui <Danesh.Daroui at ascom.com> wrote:
> Hello all,
>
> We are using a NAND flash memory which requires  4-bit ECC per 540 bytes. Since this is usually done by the MCU in a circuit and our MCU supports only 1-bit ECC, I wanted to ask whether it is possible (or maybe it has been done) to implement 4-bit ECC at driver/UBI or UBIFS level for the cases like we have that hardware, that is not able to support higher levels of ECC?

You can use Linux's software ECC.
Nur keep in mind, that this may be incompatible with your bootloader.


> Regards,
>
> Danesh Daroui
>
>
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-- 
Thanks,
//richard