Re: [Linuxptp-users] Synchronisation

[Cliff S. <th...@go...>]

On Wed, Jun 13, 2018 at 12:28 AM Gwyn Gwrtheyrn <gwy...@gm...>
wrote:
> Furthermore, it displays messages 'waiting for ptp4l..' in the beginning
when de ptp4l container is not yet up and running.  *This does not even
makes sense *since I am trying to synchronise the physical hardware clock
to the system clock, so *why* should phc2sys have to wait for ptp4l in
order to synchronise the physical hardware clock?

The -w you're passing to phc2sys tells it to wait for ptp4l to be in a
stable state. If you don't want phc2sys to wait, then you can just drop
that option.

Could you generally try "phc2sys -a -r -r -m" instead to have phc2sys
automatically load configuration from ptp4l? You could later use manual
configuration, but this will eliminate one source of potential errors.

In general, when you're typing /dev/ptp* that is likely getting expanded by
your shell into the list of matching files (e.g /dev/ptp* -> "/dev/ptp0
/dev/ptp2") before executing the command. -i only accepts one interface so
I suspect that /dev/ptp*'s expansion is being entirely ignored by ptp4l.

Maybe try running the slave ptp4l with software timestamping. If it works
well, you'd get some confidence that the master is working correctly. With
hardware timestamping, it's possible that the issue is a driver bug --
every driver I've encountered so far has had at least one hardware
timestamping bug that I've had to fix.

You may want to use wireshark on the slave to see what the incoming packets
look like.