On Thursday 11 June 2009, Andrea Gasparini wrote:
> So, the question is: is there a way to use EDMA with (at least one) user 
> space address?

No.


> Can I know (and how) a physical address given the userspace one?

Yes, there are standard utilities for that ... but I don't recall
their names.  They need to pin virtual pages into memory first.
ISTR the kmap calls would apply for single highmem pages.



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