Recursive pci scan hanging on some PC's?

[Ethin]

So I have a question about this. The PCI article talks about buses, devices and functions, but what about segment groups? How do we check for those with the recursive method?

[qookie]

IIRC each MCFG region defines the bus range and a segment. You only need to scan buses within each segment as bridges don't cross segments as far as I'm aware (since there's nowhere to store the target segment in the bridge configuration header for example).