Yes.
Oh, you propably won't meet them in PC world, but pick
any UltraSPARC; PCI and SBUS are on parallel "hoses".
("hose" is term used at Alpha code for the IO-bus to
CPU/MEMORY bus interface, sort of "north bridge".)
Actually those UltraSPARC systems have core-bus called UPA,
and IO-busses, like PCI and SBUS, are connected there...
Also these "big" systems often do come with multiple "hoses"
of same type.
If you look carefully at intel things, there is this "FSB"
which is the real core-bus, and IO-busses hang on it.
I have never myself seen big Digital Alpha system where IO-
busses are anything but PCI, but there exists options to place
there FutureBus+, PCI, VME, TurboChannel, and several other
DEC proprietary things. With 43-45 bits of physical address
space out of the processors, it is trivial to plug in multiple
32-bit address space busses.
In coherent view NUMA implementation of Linux, there possibly
comes even the detail about which NUMA node the busses reside at.
> -- Ferret
/Matti Aarnio
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