> I'm suggesting identifying a range of addresses on a bus with a "port"
> (or whatever it should be called).  Multiple ports could claim
> non-overlapping ranges on the same bus.

Which is fine until you meant a mux or a device that can be moved about
by writing to it, or has a wide range of addresses determined by
strapping.

> In this particular case (Intel LGA2011 systems), there's only one sane
> way to wire up the busses, since the memory controller *is* the smbus
> master.  According to the JEDEC spec, each DIMM slot is has three pins

Ok that helps a lot for the specific case, and you have at least in
theory got a flag between the OS and BIOS to avoid things like SMM
throwing parties on the smbus while you are using it.

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