DLCR_RX_MODE
bus_space_write_1(bst, bsh, DLCR_RX_MODE, 0);
bus_space_write_1(bst, bsh, DLCR_RX_MODE, NORMAL_MODE);
if (bus_space_read_1(bst, bsh, DLCR_RX_MODE) & RX_BUF_EMTY)
bus_space_read_1(bst, bsh, DLCR_RX_MODE),