PERFORCE change 94510 for review

[Warner Losh]

> Isn't this solved by something like wiring down unit numbers?

PCI provides no way to wire down unit numbers.

> Where when
> you need to add a hint for interrupt routing you wire down the busses
> as necessasry?  Or maybe the fact that hints have to be wired, can't there
> be some more descriptive hint that is better than depending upon hard
> coded unit numbers?

Maybe that would be better, but we should have something in place
before we break it.

> As we've gotten away from static allocation for things like this, we
> now need to invent the next method for supporting hints in a dynamic
> environment..
> 
> Topic for the dev summit:  Static hints in a dynamic world?

Heh.

Warner