REG_ATTBASE
pci_write_config(dev, sc->regs[REG_ATTBASE], gatt->ag_physical | 3, 4);
pci_write_config(dev, sc->regs[REG_ATTBASE], gatt->ag_physical, 4);
pci_write_config(dev, sc->regs[REG_ATTBASE], 0, 4);