PRG_ETHERNET_ADDR0
val = bus_space_read_4(bst, bsh, PRG_ETHERNET_ADDR0);
bus_space_write_4(bst, bsh, PRG_ETHERNET_ADDR0, val);
val = bus_space_read_4(bst, bsh, PRG_ETHERNET_ADDR0);
bus_space_write_4(bst, bsh, PRG_ETHERNET_ADDR0, val);