[PATCH] mtd/nand: Support Micron chips, 4KB page

Artem Bityutskiy dedekind1 at gmail.com
Thu Aug 5 00:31:04 EDT 2010

On Mon, 2010-07-26 at 13:04 -0700, Brian Norris wrote:
> The following parts exhibit some interesting patterns in their ID strings.
> Their ID strings are not fully compatible with the current nand_base.c
> detection algorithm. In order to detect them properly, I have taken the
> liberty to develop a heuristic algorithm. None of these chips have a *good*
> detection pattern listed in their datasheets, although MT29F16G08MAA has a
> table on p.24 of its data sheet (not included here).
> Part			ID String		Block	Page	OOB
> MT29F16G08ABABA		2C 48 00 26 89 00 00	512K	4K	224
> MT29F16G08CBABA		2C 48 04 46 85 00 00	1024K	4K	224
> MT29F16G08MAA		2C D5 94 3E 74 00 00	512K	4K	218
> I have attached a table logging most of the relevant data for the many chips
> I have researched. The three chips are highlighted red, although there are
> variants of the chips listed as well. I believe this patch should correctly
> identify all the 5-byte ID Micron chips.
> And before the question is asked: I realize that these chips support ONFI,
> so that should be the primary means by which to identify them, but I would
> still like to be able to detect these properly without ONFI if necessary,
> especially considering some of the older NAND controllers we still use do not
> support reading ONFI data.
> Feedback on my logic is appreciated.
> Signed-off-by: Brian Norris <norris at broadcom.com>

Really not sure about this patch. Sounds like ONFI should be used,
except for those few chips which do not support reading ONFI data. The
heuristics you add smell fishy...
Best Regards,
Artem Bityutskiy (Артём Битюцкий)

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