Multiple PCI controllers

[Daniel Rodrick]

Hello,

Can some one please help me understand how did the old FreeBSD kernel
that DID not have the PCI domains concept (say 6.x) used to deal with
systems that had multiple PCI / PCIe controllers on them, from a bus
numbering point of view? Was there a unified PCI tree - thus each PCI
bus number being unique in the system?

Also, how is this dealt with now?

Dan