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jclark / rpi-cm4-ptp-guide

Guide to using the hardware PTP support in the Raspberry Pi CM4
MIT License
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ts2phc "poll returns zero, no events" error #2

Open jclark opened 2 years ago

jclark commented 2 years ago

When running ts2phc together with a program that reads the PHC (e.g. phc2ys or chrony with a PHC refclock), ts2phc will log "poll returns zero, no events" errors.

jclark commented 2 years ago

More details of problem here https://github.com/raspberrypi/linux/issues/5231

Summary is it's a hardware limitation, which the driver hasn't been able to fully workaround.