PCI_CB_MEMBASE1
sc->sc_membase[1] = pci_conf_read(pc, tag, PCI_CB_MEMBASE1);
pci_conf_write(pc, tag, PCI_CB_MEMBASE1, sc->sc_membase[1]);
pci_conf_write(pc, tag, PCI_CB_MEMBASE1, 0xffffffff);