[Yaffs-archive] RE: 256 MBytes of NAND

[Charles Manning]

You can achieve 128 or 256 with a single chip these days. Samsung makes
them, as do others. You can also get stacked parts to double the capacity of
a single footprint.

Some Samsung (and maybe other vendors') parts support a boot mode where you
can do a linear read off the first block. This allows you to put your
bootstrap into the NAND with some restrictions to the type of code you want
to execute.

I don't know if the MTD can aggregate NAND parts into a single partition,
but this can definitely be done inside YAFFS if required. Achieving this
inside the MTD is probably more desirable to facilitate mounting (ie.
otherwise you'd have to have YAFFS mount two devices).

NB That the devices to support the features you want might not be available
in 512-byte page sizes. YAFFS2 (in the pipe) will support different page
sizes so this should not be an issue by the time you have a board.

-- Charles




-----Original Message-----
From: Liam Breck [mailto:liam@pointservers.org]
Sent: Wednesday, 15 January 2003 7:01 p.m.
To: yaffs@toby-churchill.org
Subject: 256 MBytes of NAND


We need 128-256 MBytes of NAND flash for a custom SBC.
We need to boot from this flash.

Are any chips available at that size, or do we have to use 2-4 chips?

If multiple chips, can YAFFS or MTD aggregate them into a single partition?

What vendors would folks recommend?

Thanks,


Liam Breck, Director
PointServers.org                                  liam@pointservers.org
Boston, Massachusetts                           http://pointservers.org/


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