Re: Problem with developing Samsung K9F1G08U0A MTD driver

[Nishanth Menon <menon.nishanth@gmail.com>]

z l stated on 10/5/2006 1:35 PM:
> driver for Samsung K9F1G08U0A chip on the board.  We
<snip>
>
> mtd.type = NAND FLASH
> mtd.flags = MTD_CLEAR_BITS | MTD_ERASEABLE | MTD_OOB |
> MTD_ECC
> mtd.size = 134217728 (128M)
> mtd.erasesize = 131072 (128K)
> mtd.oobblock = 2048 (2K)
> mtd.oobsize = 64
> mtd.ecctype = MTD_ECC_NONE
> regions = 0
>
z l stated on 10/5/2006 5:08 PM:
<snip>
> http://lists.infradead.org/pipermail/linux-mtd/2006-July/016159.html.
> and interesting enough it fixed one of our problems. 
> So it was the nandwriite that was doing the bad thing
> by writing things where "not suppose to" and made good
> blocks into "bad".  After applying the fix, at least
> we can write to the NAND without making lots of new
I have hardly looked at the nand mtd code, but maybe the data sheet
(http://www.samsung.com/Products/Semiconductor/NANDFlash/SLC_LargeBlock/1Gbit/K9F1G08U0A/ds_k9f1g08x0a_rev10.pdf#search=%22K9F1G08U0A%20%20data%20sheet%22)
might help, on the R1 device is 128M, the U device is 256M(so am not too
sure abt ur mtd.size param), on this device, page1,page2 offset 0 had
badblock info, so am not sure if mtd is putting ecc over there..

> "bad" blocks.  And the JFFS2 copied over is somewhat
> working.  Still got lot's of "nand_read_ecc: Failed
> ECC read, page 0xXXXXXXXXX" when doing normal file
> access.  So we are looking into that to see what is
> the cause of this problem.
mebbe u can try this: (dunno if it works): flash_eraseall mtd and mount
and umount the same, let jffs2 maintain the bad blocks - remount should
not show any jffs2 errors.
another issue is possibly that ur host based mkfs.jffs2 might not have
been given the right params..

Just my guesses.. but then.. I can be completely wrong...

Regards,
Nishanth Menon