LOOPBAK           803 drivers/tty/serial/pmac_zilog.c 	write_zsreg(uap, 14, (LOOPBAK | BRSRC));
LOOPBAK           804 drivers/tty/serial/pmac_zilog.c 	write_zsreg(uap, 14, (LOOPBAK | BRSRC | BRENAB));
LOOPBAK           413 drivers/tty/serial/zs.c 		newloop |= LOOPBAK;
LOOPBAK           415 drivers/tty/serial/zs.c 		newloop &= ~LOOPBAK;