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From: Hans Petter Selasky <hselasky@c2i.net>
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Cc: Adrian Chadd <adrian@freebsd.org>
Subject: Re: newbus IO ordering semantics - moving forward
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On Thursday 27 October 2011 22:28:13 Adrian Chadd wrote:
> * Make the bus default to use ordered semantics, much like what Linux
> does - ie, all IO read/writes (io or memory) are in-order and flushed
> with a barrier;

I think this is the assumption of many USB controller drivers currently in the 
tree.

--HPS