AGP3_VIA_ATTBASE
pci_cfgregwrite(0, 0, 1, 0, AGP3_VIA_ATTBASE, sc->gatt->ag_physical, 4);
pci_cfgregread(0, 0, 1, 0, AGP3_VIA_ATTBASE, 4) | 0x180, 4);
AGP3_VIA_ATTBASE };