mcr@solidum.com said:
>   In sys/arch/i386/pci/pchb.c, in pchbattach(), we only attach PCI
> buses behind the bridge if it is a bridge that we recognize.  

pchb's attach function deals only with special host bridges
which have an auxiliary PCI bus. Normal PCI busses attach to
the "mainbus".
(There is a chicken-and-egg issue: You see the pchb only if
you are already scanning a PCI bus.)

What's the problem with your hardware? A bus missing?

> Linux just works...

I believe they get the number of PCI busses from the BIOS.

best regards
Matthias