On Fri, Mar 14, 2014 at 02:45:05PM -0400, raespi wrote:
> Hello again ... diving through the drivers/mtd/nand/nand_base.c code
> I managed to boot with this little modification in the
> nand_flash_detect_onfi() function just before exiting from it:
>
> if ( mtd->oobsize > 128 )
> mtd->oobsize = 128;
>
> Apparently the only allowed oobsizes are 8, 16, 64 and 128 according
> to the nand_scan_ident() function.
You're probably referring to this code:
/*
* If no default placement scheme is given, select an
* appropriate one.
*/
if (!chip->ecc.layout && (chip->ecc.mode != NAND_ECC_SOFT_BCH)) {
switch (mtd->oobsize) {
case 8:
chip->ecc.layout = &nand_oob_8;
break;
case 16:
chip->ecc.layout = &nand_oob_16;
break;
case 64:
chip->ecc.layout = &nand_oob_64;
break;
case 128:
chip->ecc.layout = &nand_oob_128;
break;
default:
pr_warn("No oob scheme defined for oobsize %d\n",
mtd->oobsize);
BUG();
}
}
This check is only executed when you haven't specified an ecc layout in
your chip driver. You probably have to set chip->ecc.layout in your
driver.
For problems like this it often helps to compare it to the kernel code
(provided it works there). The code is quite similar.
Sascha
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