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The PCI bus looks like this: 00.00.0: 16c3:abcd (rev 01) 01:00.0: 10b5:8112 ^^^ PEX8112 x1 Lane PCI bridge 02:00.0: 4ddc:1a00 02:01.0: 4ddc:1a00 ^^^ PCI devices lspci -vvv -s 02:00.0: 02:00.0 Communication controller: ILC Data Device Corp Device 1a00 (rev 10) Subsystem: ILC Data Device Corp Device 1a00 Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- SERR- ops->scan_bus) pp->ops->scan_bus(pp); + pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci); + pci_bus_size_bridges(bus); pci_bus_assign_resources(bus);