FXP_PCI_IOBA
iobase = pci_read_config(dev, FXP_PCI_IOBA, 4);
pci_write_config(dev, FXP_PCI_IOBA, iobase, 4);
sc->rgd = (m1 == PCIM_CMD_MEMEN)? FXP_PCI_MMBA : FXP_PCI_IOBA;
sc->rgd = (m2 == PCIM_CMD_MEMEN)? FXP_PCI_MMBA : FXP_PCI_IOBA;