Transfer rates with NAND
dwmw2 at infradead.org
Thu Dec 21 21:26:52 EST 2006
On Thu, 2006-12-21 at 13:44 +0200, Indrek Kruusa wrote:
> I am wondering which NAND transfer rates are seen in embedded Linux
> projects. What to expect from the whole hardware/software subsystem?
> I have one Geode LX design with CS5536 companion chip which by using
> built-in 8-bit Flash controller on PCI bus gives me slightly over 2MB/s.
> It's almost the same with Linux MTD driver and with a self-made basic
> driver. Is the speed here the matter of flash controller only? Which is
> the fastest flash controller out there? :)
The CS5536 NAND flash controller is fairly crap in terms of performance
-- you don't get burst read/write transactions over PCI with it, so it
goes very slowly as it has to do the whole PCI setup thing for every 4
You'll get a maximum of something like 3 MiB/s from it IIRC. From a
better controller and a decent chip you might get close to ten times
that; at least in theory.
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