Re: MPC85xx DMA support for Kernel 2.6?

Hi, Dan!

Dan Malek wrote:

Before you start, just make sure such a thing is really a performance
enhancement.  Yes, the DMA does run in parallel with the core, but often
the overhead of the set up and clean up interrupt is more code and time
that if you just copied the data in a loop.  If possible, integrate the DMA
processing into other driver work, clean up a previous DMA the next time
the driver needs to use it, not with a separate completion handler.

Well... thanks. But the CPU is intended to do image processing while
data comes in. And currently, when I access (memcopy) the SRAM on my
Local Bus via UPM I cannot get it to generate bursts yet, so I hope the
DMA will speed up those things, too.

Greets,

Clemens Koller
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