[LinuxPPS] Kernel configuration and more ......

[Paul]

On Mon, 2007-11-05 at 06:50 +1000, James Boddington wrote:
> Udo van den Heuvel wrote:
> > Udo van den Heuvel wrote:
> >> Paul wrote:
> >>> this. I then tried to use NTP (with the ATOM clock). No events were
> >>> seen. So then I did cat /dev/ttyS0& (and left the process in the
> >>> background) and then NTP saw the events and the PPS started to be used
> >>> (but see below). Why? Why doesn't NTP open the port itself?
> >> ATOM not opening a port and thus not seeing events by itself (I use ATOM
> >> together with NMEA) is a problem I guess.
> > 
> > So I commented out my NMEA driver in ntp.conf and restarted ntpd.
> > No PPS was seen for the duration of the test. (long enough for kernel
> > sync and thus ATOM / PPS to be locked to external timestamps)
> > 
> > Can anyone confirm these findings?
> 
> You need to open the serial port before you get the pps. When testing I was 
> using cat /dev/ttyS0.
> 
I had to put the cat into the background ( cat /dev/ttyS0& ), which is
not really good enough, the NTP driver should be able to open this on
its own.

Paul