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SubjectRe: [PATCH v5 09/12] mtd: rawnand: ingenic: Make use of ecc-engine property
Hi Paul,

Paul Cercueil <paul@crapouillou.net> wrote on Mon, 18 Mar 2019 21:37:09
+0100:

> Hi,
>
> Le ven. 15 mars 2019 à 15:37, Paul Cercueil <paul@crapouillou.net> a écrit :
> > Hi,
> >
> > Le ven. 15 mars 2019 à 9:40, Miquel Raynal > <miquel.raynal@bootlin.com> a écrit :
> >> Hi Paul,
> >> >> Paul Cercueil <paul@crapouillou.net> wrote on Wed, 13 Mar 2019 >> 23:22:56
> >> +0100:
> >> >>> Use the 'ecc-engine' standard property instead of the custom
> >>> 'ingenic,bch-controller' custom property, which is now deprecated.
> >>> >>> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> >>> ---
> >>> >>> Notes:
> >>> v5: New patch
> >>> >>> drivers/mtd/nand/raw/ingenic/ingenic_ecc.c | 13 ++++++++++---
> >>> 1 file changed, 10 insertions(+), 3 deletions(-)
> >>> >>> diff --git a/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c >>> b/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
> >>> index d7f3a8c3abea..30436ca6628a 100644
> >>> --- a/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
> >>> +++ b/drivers/mtd/nand/raw/ingenic/ingenic_ecc.c
> >>> @@ -82,9 +82,9 @@ static struct ingenic_ecc >>> *ingenic_ecc_get(struct device_node *np)
> >>> >>> /**
> >>> * of_ingenic_ecc_get() - get the ECC controller from a DT node
> >>> - * @of_node: the node that contains a bch-controller property.
> >>> + * @of_node: the node that contains a ecc-engine property.
> >> >> Would "contains an ecc-engine property" be better English?
> >> >> I am not sure what is the rule when it comes to plain English with
> >> variable names. However if you agree, no need to re-send the series, >> I
> >> can fix it when applying.
> >
> > Yes, that's better.
> >
> >> BTW, I added hw ECC engines support to my generic ECC engine
> >> implementation, but migrating the whole raw NAND subsystem (using I/O
> >> requests like in the SPI-NAND core, adding prepare/finish_io_req >> hooks)
> >> is going to be much more invasive than initially expected, so I am >> not
> >> sure I will finish the migration any time soon.
> >
> > Ok, I will follow the development then.
> >
> >> Thanks,
> >> Miquèl
> >
> > One thing I notice with my patchset: it works perfectly on top of > 4.20,
> > but on top of 5.0 I am unable to erase any eraseblock with > flash_erase.
> > I get -EIO every time. I'm trying to debug it but didn't go very far,
> > it looks like nand_status_op() gives me a status of 0xff. Do you know
> > what could have changed between 4.20 and 5.0 that could trigger this > bug?
>
> Nevermind. It works now.

Great!

>
> > Second thing, everytime I reboot it fails to find the BBT. That's > because
> > the BBT marker is overwritten by the ECC data as they occupy the same > area
> > in the OOB space. Is there a way to move the BBT marker? Or should I > use
> > NAND_BBT_NO_OOB then? Since the eraseblocks where the BBTs are located
> > is used in my system partition, won't that conflict with the data?
>
> Response to myself: It's possible to move the BBT marker. But in my case I
> have to deal with three possible layouts, so it's simpler to just use
> NAND_BBT_NO_OOB then. The BBT pages are marked so that they're not used
> for data in the partitions.

Maybe you should check Frieder's series:

mtd: rawnand: Support bad block markers in first, second or last page


Thanks,
Miquèl

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