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From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Fabio Estevam <festevam@gmail.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>,
	linux-mtd@lists.infradead.org,
	Sascha Hauer <kernel@pengutronix.de>,
	Lucas Stach <l.stach@pengutronix.de>
Subject: Re: imx27: Unsupported ECC algorithm
Date: Wed, 14 Oct 2020 15:26:59 +0200
Message-ID: <20201014152659.6ef6a2fc@xps13> (raw)
In-Reply-To: <CAOMZO5Cq6v0OvpLSYwqqpHQFDjviM3mwozHcH35qoOTFvdnJ-w@mail.gmail.com>

Hi Fabio, Sascha, Lucas,

Fabio Estevam <festevam@gmail.com> wrote on Wed, 14 Oct 2020 09:23:06
-0300:

> Hi Lucas,
> 
> On Tue, Oct 13, 2020 at 2:14 PM Lucas Stach <l.stach@pengutronix.de> wrote:
> 
> > Just a heads up: our lab was broken for some time due to a local issue.
> > It's now back to working and the backlog of jobs is being executed on
> > the boards right now, so results should show up in the near furture.  
> 
> Thanks. kernelci results are showing up again.
> 
> Hi Miquel,
> 
> The ECC issues are still present on imx27-phytec-phycard-s-rdk:
> https://storage.kernelci.org/next/master/next-20201013/arm/imx_v4_v5_defconfig/gcc-8/lab-pengutronix/baseline-imx27-phytec-phycard-s-rdk.html
> 
> BTW, ECC errors are also reported on a Freescale Layerscape 2088A RDB Board:
> https://www.spinics.net/lists/iommu/msg49772.html
> 

I supposed the failing division is this one:

        /*
         * Set the number of read / write steps for one page depending on ECC
         * mode.
         */
        ecc->steps = mtd->writesize / ecc->size;
        if (ecc->steps * ecc->size != mtd->writesize) {
                WARN(1, "Invalid ECC parameters\n");
                ret = -EINVAL;
                goto err_nand_manuf_cleanup;
        }

Which produces the warning right after. This would mean that

	ecc->size == 0

But this entry is set before calling nand_scan() in mxcnd_probe() to
512, and that does not make sense.

I guess we should be able to reproduce this error with any board using
the mxc NAND driver with hardware correction (now also called "on
host"). Do you have such a board available to at least verify that the
beginning of my logic is right?

Thanks,
Miquèl

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Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-16 13:49 Fabio Estevam
2020-09-17 16:13 ` Miquel Raynal
2020-09-17 16:45   ` Miquel Raynal
2020-09-17 17:12     ` Fabio Estevam
2020-09-21  9:40 ` Sascha Hauer
2020-09-28 15:20   ` Miquel Raynal
2020-09-29 11:39     ` Fabio Estevam
2020-09-29 16:31       ` Fabio Estevam
2020-09-29 17:46         ` Miquel Raynal
2020-09-30 14:58         ` Miquel Raynal
2020-10-01 21:39           ` Fabio Estevam
2020-10-13 17:14             ` Lucas Stach
2020-10-13 17:36               ` Miquel Raynal
2020-10-14 12:23               ` Fabio Estevam
2020-10-14 13:26                 ` Miquel Raynal [this message]
2020-10-15 19:24                   ` Fabio Estevam
2020-10-16  3:04                   ` Han Xu
2020-10-16  6:39                   ` Sascha Hauer
2020-10-16  7:53                     ` Miquel Raynal

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