>         I really don't see any advantage to a separate I/O map over use of
> memory mapped I/O.

It is pointless to debate this here.  Both methods have their pros and cons.
Many processor designers have done what you suggest, partly for the reasons
you state.  On the other hand, many others have done it the other way, also
for good reasons.  Notice that I'm not giving arguments for either because
that kind of pissing match is a waste of time.  I'm just pointing out that
many people who spent their careers designing processors have chosen both
methods.


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