DBI_WR1
DBI_WR1(sc, PCIR_CLASS, PCIC_BRIDGE);
DBI_WR1(sc, PCIR_SUBCLASS, PCIS_BRIDGE_PCI);
DBI_WR1(sc, PCIR_INTPIN, 1);
DBI_WR1(sc, PCIR_PRIBUS_1, sc->root_bus);
DBI_WR1(sc, PCIR_SECBUS_1, sc->sub_bus);
DBI_WR1(sc, PCIR_SUBBUS_1, sc->bus_end);