misc questions about the device&driver arch

[Warner Losh]

> > That happens at attach time.  Cardbus right now has a private protocol
> > between the card bus bridge (cbb) and the bus to know when there's a
> > new card in a slot and to enumerate that bus.
> i think that 's because in cardbus protocol ,one bus only  have one
> device ,so does pci express port  (port :device =1:1)

Cool.  I just bought a new laptop yesterday.  It has an expresscard
slot, which I think is handled as a PCI Express port (or USB 2.0 port,
depending on the card that's inserted).

> so there will be a long list of methods in the future hotplug pci
> driver and pcib driver
> SHPC interface ..
> .......
> PCIE interface
> .......
> compaq interface
> .......
> IBM interface ....
> .......
> poer interface
> .......

Yes.  If ExpressCard isn't handled by the PCIe interface, then we'd
want to add it to the list as well.

Warner