No oob scheme defined for oobsize 224 on imx6ull board

[Sascha Hauer]

Hi,

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

> 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 at 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 ;)

Regards,
  Sascha

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