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From: "Stephan Linke" <Stephan.Linke@epygi.de>
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Date: Fri, 11 Jul 2003 09:33:05 +0200
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cc: Charles Manning <manningc2@actrix.gen.nz>
cc: linux-mtd@lists.infradead.org
Subject: RE: nand flash driver
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Hi,

>=20
> It will work with addresslines, if
>=20
> 1. All datasheets are reliable
> 2. Your hardwaredesigner can precalculate all the timings in details =
even=20
> under high interrupt load !!!!
> 3. the softwareguy is aware of the above problems
>=20
> My experience is (I have a bunch of different solutions here on top of =
my=20
> desk):
>=20
> Either you have a genius in hardware and software design available or =
you have=20
> a rock solid solution with GPIO/FPGA/CPLD. The second one will either=20
> increase your production costs by <1$ per piece or decrease your =
performance=20
> by about 8%.
> Both negatives will be less than the debugging and redesign costs.
>=20

I don't know exactly what our hardware guys did but from softer =
perspective I can say the most "difficult" part is to copy =
nand_command() and modify it so it uses your addresses to switch between =
data, address and command mode. You can remove a few calls of =
hwcontrol(). Write your own hwcontrol() and dev_ready() function, that's =
it. Few magic in there.
The important question is: did the hardware designer a good job? And I =
hope ours did. ;-)

Stephan