OMAP3 NAND ECC selection

[Peter Meerwald]

Hello, 

> Meanwhile, to do this we use a small userspace program created by
> Javier Martinez in order to flash the MLO in our OMAP3 boards. See
> 
> http://git.isee.biz/?p=pub/scm/writeloader.git;a=summary

I tried this with a 3.7 kernel and the following NAND; it does not work 
for me

# ./writeloader -i /boot/u-boot.img  -o /dev/mtd1
Error writing ECC in OOB area: Invalid argument

nand_do_write_oob() in nand_base.c fails with
	if ((ops->ooboffs + ops->ooblen) > len) {
		pr_debug("%s: attempt to write past end of page\n",
				__func__);
		return -EINVAL;
	}

ops->ooboffs, ops->ooblen, len is 1536, 64, 64, resp.

write_ecc() in writeloader.c does
	oob.start = (sector_cnt - 1) * SECTOR_SIZE;
	oob.ptr = oobbuf;
	oob.length = 64;

	return ioctl(ofd, MEMWRITEOOB, &oob) != 0;
where sector_cnt is 4

this looks weird to me -- any ideas?

NAND device: Manufacturer ID: 0x2c, Chip ID: 0xbc (Micron NAND 512MiB 1,8V 16-bit), page size: 2048, OOB size: 64

# ./mtdinfo  -a
Count of MTD devices:           6
Present MTD devices:            mtd0, mtd1, mtd2, mtd3, mtd4, mtd5
Sysfs interface supported:      yes

mtd0
Name:                           MLO
Type:                           nand
Eraseblock size:                131072 bytes, 128.0 KiB
Amount of eraseblocks:          4 (524288 bytes, 512.0 KiB)
Minimum input/output unit size: 2048 bytes
Sub-page size:                  512 bytes
OOB size:                       64 bytes
Character device major/minor:   90:0
Bad blocks are allowed:         true
Device is writable:             true

mtd1
Name:                           u-Boot
Type:                           nand
Eraseblock size:                131072 bytes, 128.0 KiB
Amount of eraseblocks:          4 (524288 bytes, 512.0 KiB)
Minimum input/output unit size: 2048 bytes
Sub-page size:                  512 bytes
OOB size:                       64 bytes
Character device major/minor:   90:2
Bad blocks are allowed:         true
Device is writable:             true

thanks, regards, p.

-- 

Peter Meerwald
+43-664-2444418 (mobile)