PARAM_RETURN      220 drivers/net/hamradio/baycom_epp.c #define PARAM_RETURN    255
PARAM_RETURN       64 drivers/net/hamradio/hdlcdrv.c #define PARAM_RETURN    255
PARAM_RETURN       54 include/uapi/linux/scc.h 	PARAM_RETURN = 255	/* reset kiss mode */