Messages in this thread | | | Date | Wed, 5 May 2010 09:34:56 +0200 | From | Matthieu CASTET <> | Subject | Re: [PATCHv2 1/2] mtd: nand: Extend NAND flash detection to new MLC chips |
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Hi,
Kevin Cernekee a écrit : > Some of the newer MLC devices have a 6-byte ID sequence in which > several field definitions differ from older chips in a manner that is > not backward compatible. For instance: > Doesn't these nand support ONFI "Read Parameter Page" (cmd 0xec) ? If yes it will be a more generic way to detect new nand features.
Matthieu
> Samsung K9GAG08U0M (5-byte sequence): ec d5 14 b6 74 > 4th byte, bits 1:0 encode the page size: 0=1KiB, 1=2KiB, 2=4KiB, 3=8KiB > 4th byte, bits 5:4 encode the block size: 0=64KiB, 1=128KiB, ... > 4th byte, bit 6 encodes the OOB size: 0=8B/512B, 1=16B/512B > > Samsung K9GAG08U0D (6-byte sequence): ec d5 94 29 34 41 > 4th byte, bits 1:0 encode the page size: 0=2KiB, 1=4KiB, 3=8KiB, 4=rsvd > 4th byte, bits 7;5:4 encode the block size: 0=128KiB, 1=256KiB, ... > 4th byte, bits 6;3:2 encode the OOB size: 1=128B/page, 2=218B/page > > This patch uses the new 6-byte scheme if the following conditions are > all true: > > 1) The ID code wraps around after exactly 6 bytes > > 2) Manufacturer is Samsung > > 3) 6th byte is zero > > The patch also extends the maximum OOB size from 128B to 256B. >
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