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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Robert Dewar's great article about the Strengths of Ada over
  other langauges in multiprocessing!
Date: Thu, 13 Mar 2008 22:01:28 +0000
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gpriv@axonx.com writes:

> So if you write to IO through volatile and later read from it, you
> may get the same value fetched back by "smart" CPU.

On the PowerPC/VME hardware I'm using, the memory mapping is arranged
so that VME (== IO) space isn't cached. I would imagine the same would
have to be true of any memory-mapped IO scheme.