linux-kernel - Re: [PATCH v2] mtd: spinand: add support for Foresee FS35ND01G-S1Y2

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Message-ID: <CAFr9PXnxvacKOf=n+Gt16BHdjwL2cUqr9ZD=A=YeSftYFYrKEA@mail.gmail.com>
Date:   Tue, 23 Mar 2021 23:14:48 +0900
From:   Daniel Palmer <daniel@...f.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     linux-mtd@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mtd: spinand: add support for Foresee FS35ND01G-S1Y2

Hi Miquel,

On Tue, 23 Mar 2021 at 23:06, Miquel Raynal <miquel.raynal@...tlin.com> wrote:
> >
> > # nandbiterrs -i /dev/mtd1
> > incremental biterrors test
> > Successfully corrected 0 bit errors per subpage
> > Inserted biterror @ 0/5
> > Read reported 4 corrected bit errors
> > ECC failure, invalid data despite read success
>
> This is not a valid behavior. There is something wrong with the way ECC
> status is read/retrieved. The read should indeed report 4 corrected bit
> errors, but then the data should be valid. Here it means that the
> introduced error appears corrected but in fact is not.
>
> We need to understand what status are available and write the
> appropriate vendor code.

Ok. Glad we checked then :).
Before sending again I will recheck how the ECC status is read and fix that up.

Thanks,

Daniel