Hello,
I'm trying to use ptp4l (Version 1.7) on a Raspberry Pi. Unfortunately the
device's network interface does not support hardware timestamping.
$ ethtool -T eth0
Time stamping parameters for eth0:
Capabilities:
software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)
software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
PTP Hardware Clock: none
Hardware Transmit Timestamp Modes: none
Hardware Receive Filter Modes: none
I thought I could use software timestamping in this case. Though executing
ptp4l with option -S I see the following output:
$ ./ptp4l -i eth0 -S -m
ptp4l[42.597]: interface 'eth0' does not support requested timestamping mode
failed to create a clock
Obviously my understanding of option -S or software timestamping is wrong.
What is the difference between options -S and -H? What hardware support is
needed for option -S? Is it a driver problem?
Thanks,
Jan
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