[Yaffs] OneNAND

[Nick Bane]

Charles/Thomas and other

What are the implications of Samsungs OneNAND chips on yaffs/mtd? It =
looks like they are yaffs1 block style internally on a 16-bit address =
and data bus with densities up to 4Gbit in mass production now. Access =
is fairly dissimilar to generic nand though.

They are essentially a buffered NAND with hardware ecc built in giving =
very fast access times as well as a 1K boot cache xip area.

It looks like the oob is accessible but in a slightly restriced way. =
Hopefully this can all be hidden from yaffs per se via the mtd layer. =
Are there plans to support OneNAND Thomas?

I note the mtd thread in Feb started by samsung (starting from =
http://lists.infradead.org/pipermail/linux-mtd/2005-February/011860.html)=
. The mood seemed to be to split off OneNAND from generic nand as the =
access is so different. I was unclear whether this presents OneNAND as =
non generic NAND mtd technology possibly requiring changes to yaffs eg =
the test for the device being an "mtd-nand" at mount time.

See =
http://www.samsung.com/Products/Semiconductor/Flash/OneNAND_TM/1Gbit/KFG1=
G16U2M/KFG1G16U2M.htm for example info.

Nick

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Nick Bane
nick@cecomputing.co.uk
+44 (0)1954 719270=20
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