On 12/2/2020 2:23 PM, Jonathan Hull via Linuxptp-users wrote:
> I am seeing the same thing. Great timing. I don't know if pictures will
> go through this forum. Using a Xilinx MPSoC platform as well with an
> AR8031 PHY. Ethtool shows the following. Below is a comparison between a
> Ubuntu 18.04 system and an embedded Linux (Yocto) system. Using the pmc
> GET TIME_STATUS_NP command is shown on both systems below. You can see
> the master_offset and ingress_time are way off.
>
I'm not sure exactly what those images are supposed to show us? Are each
of those two systems connected?
It sure looks like you've got some driver issues to work out. That would
be better discussed with the driver authors, perhaps on the netdev
mailing lists, assuming the driver is open source and part of the kernel.
You might try poking at the clock manually (try using phc_ctl, for
example) and make sure that it behaves in a sane way in response to
adjustment commands first. If that's working, then you could try sending
basic traffic and making sure the reported timestamps seem sane too.
Thanks,
Jake
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