SV_PCI_DMAC
data = pci_read_config(dev, SV_PCI_DMAC, 4);
pci_write_config(dev, SV_PCI_DMAC, 0, 4);
bus_set_resource(dev, SYS_RES_IOPORT, SV_PCI_DMAC, sdmac, SV_PCI_DMAC_SIZE);
sc->dmac_rid = SV_PCI_DMAC;
data = pci_read_config(dev, SV_PCI_DMAC, 4) | SV_PCI_DMA_ENABLE | SV_PCI_DMA_EXTENDED;
pci_write_config(dev, SV_PCI_DMAC, data, 4);
DEB(printf("dmac: 0x%x 0x%x\n", data, pci_read_config(dev, SV_PCI_DMAC, 4)));