On Mon, Jan 18, 2021 at 04:05:52AM +0000, Coughlin, David S wrote:
> I tried running phc2sys to synch the processor clock with the phc,
> by running it: phc2sys -r -O 0 -s /dev/ptp0 but this had no effect.
> The usage statement in phc2sys.c does not indicate that the -a and
> -r, but the documentation [now that I'm looking at it] seems to say
> that -r is only valid in conjunction with -a. I'm fuzzy on how
> getopts works, so I can't judge anything from that line in the code.
> Since I need to point phc2sys at /dev/ptp0 as its master clock, I
> was not sure that autoconfiguration was valid. Do I need to update
> my invocation to `phc2sys -ar -O 0 -s /dev/ptp0`, or do I require
> some other configuration?
For phc2sys, you either choose automatic configuration,
-a turn on autoconfiguration
-r synchronize system (realtime) clock
repeat -r to consider it also as a time source
or manual configuration,
-c [dev|name] time sink device (CLOCK_REALTIME)
-d [dev] time source PPS device
-s [dev|name] time source device
-O [offset] sink-source time offset in seconds (0)
-w wait for ptp4l
So what you are looking for is something like
phc2sys -s /dev/ptp0 -O 0
HTH,
Richard
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