The issue seems to be a misconfiguration in the standard
/lib/systemd/system/ptp4l@.service: apparently, it starts already when the
network (hardware) is not fully up and running – at least on my Raspberry Pi5
is not sufficiently up (running current Debian bookworm from Raspberry with
Network M
Package: linuxptp
Version: 4.2-1
When (re-)booting the system the dependencies of ptp4l@.service (and
phc2sys@.service) do not seem to be sufficient as the hardware (in this case
eth0) is not up and running when those services are started, leading to a fail
in SIOCSHWTSTAMP when using phc2sys -
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