Document the new timestamping behaviour here, too, and note that enabling

PPS is a device specific operation that might need special software (e.g.
from our ports tree).

gpsd is such an application and it has just been enabled to nicely play with
the new timestamping.

1 files changed, 7 insertions, 3 deletions

diff --git a/sbin/nmeaattach/nmeaattach.8 b/sbin/nmeaattach/nmeaattach.8
index e2ee6ef7429..3354ae5ff20 100644
--- a/sbin/nmeaattach/nmeaattach.8
+++ b/sbin/nmeaattach/nmeaattach.8
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: nmeaattach.8,v 1.4 2006/10/27 18:46:52 mbalmer Exp $
+.\"	$OpenBSD: nmeaattach.8,v 1.5 2006/11/29 00:16:35 mbalmer Exp $
 .\"
 .\" Copyright (c) 2006 Marc Balmer <mbalmer@openbsd.org>
 .\"
@@ -45,8 +45,9 @@ Specifically, this disables HUPCL.
 Specifies the speed of the connection.
 If not specified, the default of 4800 baud is used.
 .It Fl t Ar cond
-Chooses the condition which will cause the current system
-time to be immediately copied to the terminal timestamp storage.
+Chooses the condition which will cause the current system time to be
+immediately copied to the terminal timestamp storage for subsequent use by
+.Xr nmea 4 .
 Only one can be used.
 .Pp
 .Bl -tag -width DCDXX -offset indent -compact
@@ -65,6 +66,9 @@ If no condition is specified, the
 line discipline will timestamp on receiving the leading
 .Sq $
 character of each GPRMC sentence.
+.Pp
+Configuring the NMEA device to issue a PPS signal is device specific and
+should be done by device specific applications.
 .It Ar device
 Specifies the name of the serial line.
 .Ar device