Re: write alignment matters?

[David Holland <dholland-tech%netbsd.org@localhost>]

On Thu, Jun 23, 2011 at 06:36:31AM -0700, Matt Thomas wrote:
 > > That doesn't seem like it can really be right.  There are plenty of
 > > systems where devices cannot DMA from user addresses.
 > 
 > Really?  That seems unlikely.  

It's not that devices can't DMA from user addresses; it's that they
might or might not be able to DMA from an arbitrary user buffer
depending on where it happens to have been placed in the machine's
physical address space.

-- 
David A. Holland
dholland%netbsd.org@localhost