PCI_CAP_PCIEXPRESS
if (pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_PCIEXPRESS,
PCI_CAP_PCIEXPRESS, &sc->sc_cap_off, NULL);
PCI_CAP_PCIEXPRESS, &sc->sc_cap_off, NULL);
PCI_CAP_PCIEXPRESS, &sc->sc_cap_off, NULL);