PCIC_CFGDATA
data = bus_space_read_4(&pci_iot, pci_ioh, PCIC_CFGDATA);
bus_space_write_4(&pci_iot, pci_ioh, PCIC_CFGDATA, data);
data = bus_space_read_4(&pcix_cfg_tag, pcix_cfg_ioh, PCIC_CFGDATA);
bus_space_write_4(&pcix_cfg_tag, pcix_cfg_ioh, PCIC_CFGDATA, data);