Re: [Linuxptp-users] grandmaster with an H/P 3805A GPS disciplined osc

[David G. <dav...@po...>]

On 08/21/2013 10:33 PM, Richard Cochran wrote:
> On Wed, Aug 21, 2013 at 03:38:26PM -0700, David Gravereaux wrote:

>> Now if I'm using ptp as a grandmaster, who trains the /dev/ptp0 and how?
> 
> (That would be the program that you are going to write ;)
> 
>>  Or if I'm driving a PPS input at the comport's DCD line that NTPd is
>> using through its atom driver to /dev/pps0, is this managed by ptp4l for
>> slewing the card's clock?
> 
> No, it is not managed by ptp4l. You have to make sure that, if run
> them at the same time, ntpd and ptp4l/phc2sys do not step on each
> other's toes.


So instead of phc2sys, I'm wanting a gps2phc+rtc ;)

If my head is screwed on right, this almost gets me there given system
clock is the reference for start offset, but takes over from PPS, though
not a physical signal to the NIC.

  phc2sys -wmql 7 -d /dev/pps0 -s CLOCK_REALTIME -c /dev/ptp0

If this is true, I'd be happy with this for the moment.

-- 
David Gravereaux <dav...@po...>