>> I have a few hardware platforms that have a basically compatible
>> 16550 chip on them, but they do something "funny".

>> E.g. one chip maps registers at 4 byte offsets.

> I've seen one of those (not running netbsd, but...)

I saw one once.  It was the console of some hardware I was tasked with
porting NetBSD to.

I ended up going the funky-bus-space route - I created a new bus-space
just for the purpose of attaching the console com instance to.  Worked
fine, once I figured out enough of the bus-space paradigm to get it
right. :)  (No, the port never went live.  The project was canned, and
I don't think I even have any of the code any longer.)

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