I have tried to move to Linux Kernel 5.7.0 (intel-socfpga) and ran into the same issues. Does anyone have a working PTP implementation in an Intel FPGA?
From: Zuckerbrod, Daniel Sent: Monday, August 10, 2020 9:27 AM To: linuxptp-users@lists.sourceforge.net Subject: Stratix 10 & PTP Hi, I am using an Intel/Altera Stratix 10 and would like to use the ARM HPS EMAC PTP interface. I am providing a 100 MHz to the s10_hps_emac_ptp_ref_clock_clk with plans to use the PTP timestamp in the FPGA fabric. I can see the timestamp serially shift out of the ARM as expected. However, no matter what I change in the device tree I seem to always have issues using hardware timestamping (./ptp4l -m -s -i eth1 -H). Software timestamping always works without issue (./ptp4l -m -s -i eth1 -S). I am not sure what the "freq" column means, but it always says -62500000: ptp4l[276.189]: master offset -29715517212917536 s0 freq -62500000 path delay 35700952 ptp4l[277.189]: clockcheck: clock jumped backward or running slower than expected! I am using Linux Kernel version 4.14.73 Any help would be appreciated. Thanks, Daniel
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