PORT_SERIAL_CONTROL
u32 pscr = rdlp(mp, PORT_SERIAL_CONTROL);
wrlp(mp, PORT_SERIAL_CONTROL, pscr);
pscr = rdlp(mp, PORT_SERIAL_CONTROL);
wrlp(mp, PORT_SERIAL_CONTROL, pscr);
wrlp(mp, PORT_SERIAL_CONTROL, pscr);
data = rdlp(mp, PORT_SERIAL_CONTROL);
wrlp(mp, PORT_SERIAL_CONTROL, data);
pscr = rdlp(mp, PORT_SERIAL_CONTROL);
wrlp(mp, PORT_SERIAL_CONTROL, pscr);
wrlp(mp, PORT_SERIAL_CONTROL, pscr);