Re: PTP TAI Query

Miroslav Lichvar <[email protected]> Mon, 24 Nov 2025 09:39:19 +0100
Newsgroups gmane.comp.time.chrony.user
Message-ID <aSQZt7EgApJSuTlt@localhost>
On Sun, Nov 23, 2025 at 09:23:05PM +1300, Chris Hodgetts wrote:
> Hello, 
> 
> I have just upgraded to chrony version 4.6.1 on Debian 13 
> 
> I have noticed my PTP time has not failed, and it appears to be when I put : 
> 
> refclock PHC /dev/ptp0 poll 0 dpoll 0 tai
> 
> If I remove tai - I get 37 second offset and Chrony does not sync to PTP. 

What exactly failed means here? Not being selected for
synchronization? Please provide output from the chronyc sources
command.

How is the PHC synchronized? Is it ptp4l?

-- 
Miroslav Lichvar


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