Hi, I have built from latest linuxptp snapshot, because I want to use the virtual clock support.
I have created two virtual clocks (/dev/ptp2 and /dev/ptp3), based on the physical clock /dev/ptp1: echo 2 >/sys/class/ptp/ptp1/n_vclocks Then I have started ptp4l with this command line: ./ptp4l -i swp0 --phc_index=2 -m This is an extract of the messages when ptp4l starts, then link goes down and link goes up again: ptp4l[10842.853]: selected /dev/ptp2 as PTP clock ptp4l[10842.854]: port 1 (swp0): /dev/ptp2 is virtual clock ptp4l[10864.838]: port 1 (swp0): link down ptp4l[10878.197]: port 1 (swp0): link up ptp4l[10878.202]: Switching PHC, failed to open /dev/ptp1: Device or resource busy It seems when link goes up ptp4l wants to switch from requested /dev/ptp2 to physical clock /dev/ptp1, which fails. Why does ptp4l switch the PHC when link is changed? I think the given command line is the preferred one, but the behavior is the same with this command line: ./ptp4l -i swp0 -p /dev/ptp2 -m Regards Markus
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