Hi,
 

------------------ Original ------------------
From: "Sascha Hauer" <redacted>;
Date: Wed, Jan 6, 2021 06:35 PM
To: "郑小军"<redacted>;
Cc: "barebox"<redacted>;
Subject: Re: No oob scheme defined for oobsize 224 on imx6ull board

Hi,

On Fri, Dec 18, 2020 at 05:11:11PM +0800, 郑小军 wrote:

quoted

Hi, all
    I am trying to run barebox on my i.mx6ull board.  I inherit from
nxp-imx6ull-evk. When I added nand flash support, system crashed. I
found that the pointer "chip->legacy.set_features" and
"chip->legacy.get_features" in nand_mxs.c was NULL.
I replaced it with nand_set_features() and nand_get_features().

This looks like the correct solution for this. Care to send a patch?

I have sent a patch email. My first time send a patch to barebox, so if
the format is improper, feel free to tell me.

quoted

Barebox didn't crash again, but I get the errors:
        nand_base: device found, Manufacturer ID: 0x2c, Chip ID: 0xdc
        nand_base: Micron MT29F4G08ABAEAWP
        nand_base: 512 MiB, SLC, erase size: 256 KiB, page size: 4096,
OOB size: 224
        WARNING: at drivers/mtd/nand/nand_base.c:5591/nand_scan_tail()!
        WARNING: No oob scheme defined for oobsize 224
        mxs_nand 1806000.nand-controller@1806000.of: probe failed:
Invalid argument

You are falling into:

/*
* If no default placement scheme is given, select an appropriate one.
*/
if (!mtd->ooblayout &&
    !(ecc->mode == NAND_ECC_SOFT && ecc->algo == NAND_ECC_BCH)) {
...
}

Normally mtd->ooblayout should be set at this point. the nand_mxs driver
currently misses to set it. I think you have to adopt
gpmi_ooblayout_ecc() and gpmi_ooblayout_free() from the Linux driver for
barebox.

This bug seems to trigger for NANDs with bigger page sizes. I only
tested the last NAND layer update with smaller page sizes. So it's not
you who misses something, it's me who missed something ;)

thanks, I'll try it. If it runs, I'll send another patch.

Regards,
  Sascha

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