com_dlbl
outb(port + com_dlbl, newsp);
outb(port + com_dlbl, newsp);
outb(port + com_dlbl, newsp);
COM_WRITE(sc, com_dlbl, ospeed);
bus_space_write_1(iot, ioh, com_dlbl, rate);
dlbl = com_read_reg(sc, com_dlbl);
com_write_reg(sc, com_dlbl, 0);
sc->sc_uartrev = com_read_reg(sc, com_dlbl);
com_write_reg(sc, com_dlbl, dlbl);
com_write_reg(sc, com_dlbl, 3);
com_write_reg(sc, com_dlbl, ospeed);
com_write_reg(sc, com_dlbl, ospeed);