Seems that PCI Express is a more modern way to deal with peripheral than legacy PCI (and it's backward compatible)

So this must be achieved by this way :

• Get the ACPI 'MCFG' table (needs #73 (closed))
• Parse it using the extended configuration mechanics. There is a lot of documentation on it

Branch must be pci (derived directly from acpi when #73 (closed) will be done)