PCIR_SECBUS_1
sc->secbus = pci_read_config(dev, PCIR_SECBUS_1, 1);
bus = pci_read_config(dev, PCIR_SECBUS_1, 1);
bus = pci_read_config(dev, PCIR_SECBUS_1, 1);
print_bus_range(fd, p, PCIR_SECBUS_1, PCIR_SUBBUS_1);