Howto use PPC4xx memory to memory DMA

[- Reyneke]

Yes, I know - that email is in response to a question I posted.  :)

This seems to be one of those ongoing uncertainties. It seems commonly 
advocated that you shouldn't use it, but as yet I've found no suitable 
alternative.

Some more reading on why you *should* use it:

http://ozlabs.org/pipermail/linuxppc64-dev/2004-March/001276.html

It would be nice if we could get a definitive answer to this. Anyone out 
there who knows?

Cheers
   Jan Reyneke


>From: T Ziomek <ctz001 at email.mot.com>
>>
>>source = virt_to_bus((u32 *)mem);
>
>The above contradicts an email by Ben H back on 22 Dec:
><http://ozlabs.org/pipermail/linuxppc-embedded/2006-December/025546.html>
>But I don't know enough to resolve the conflict...
>
>Tom

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