On May 11, 2006, at 1:19 PM, Izumi Tsutsui wrote:
PCI-HOST bridge is found twice (localbus and pcibus) on all ports, though some ports don't have an independent driver to configure it on localbus. The problem (which is consusing) is that all other ports use "pchb" for the latter but evbppc uses it for the former.
No, not on all ports. Only on some platforms is the PCI-Host bridge even visible in the PCI configuration space. i386 happens to be one such example. Alpha is an example of where it is not.
Also, on i386, the "pchb" device may, in fact, attach sub-PCI devices ... there are some Serverworks chipsets where this is the case, and some Intel ones, too. The "pchb" device on i386 really is an i386-specific device, and has no real MI concepts in it.
-- thorpej