PCIR_BRIDGECTL_1
sc->bridgectl = pci_read_config(dev, PCIR_BRIDGECTL_1, 2);
config = pci_read_config(pcib, PCIR_BRIDGECTL_1, 2);
config = pci_read_config(pcib, PCIR_BRIDGECTL_1, 2);
pci_write_config(pcib, PCIR_BRIDGECTL_1, config, 2);
bctl = read_config(fd, &p->pc_sel, PCIR_BRIDGECTL_1, 2);