Re: UBIFS ECC errors

[Richard Weinberger <richard@xxxxxx>]

----- Ursprüngliche Mail -----
> Von: "Sergeant Peppercorn" <speppercorn109@xxxxxxxxx>
> An: "Richard Weinberger" <richard.weinberger@xxxxxxxxx>
> CC: "linux-mtd" <linux-mtd@xxxxxxxxxxxxxxxxxxx>
> Gesendet: Freitag, 2. August 2019 18:14:55
> Betreff: Re: UBIFS ECC errors

> Hi, many thanks for the reply.
> 
> I have seen posts on bitflips in empty space issues before, but don't
> remember seeing any fixes. Does this mean the kernel UBI drivers must
> be patched? Can you elaborate on what fixes or where to find patches,
> etc, or what to do about this, then? All I care about is getting this
> to work, and hopefully without needing to reformat the root file
> system on 50,000 units in the field.

Your kernel is pretty old, so I guess you don't have this commit:
730a43fbc135 ("mtd: nand: add nand_check_erased helper functions")
 
Bitflips in empty pages should be handled in the NAND layer.

Please don't blindly apply this patch, it may have dependencies or will
uncover other bugs. Such as fix:
fdf2e8210529 ("mtd: nand: gpmi: Fix failure when a erased page has a bitflip at BBM")

Thanks,
//richard

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