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