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  • TI Thinks Resolved

Linux/AM5728: AM572x GMAC PPS Output/PTP problems

Prodigy 30 points

Replies: 6

Views: 211

Part Number: AM5728

Tool/software: Linux

My board is AM572x Rev 1.3B. When the board delivered to me, first I want to make the board output PPS signal with PTP operating. So I followed the next link. 

After I set up u-boot environment variables and device tree file, and hardware modification, I modified the pps_enable file to PPS_ON(1). But it didn't work.

Also I operated ptp4l program with another TI EVM(EVMK2H). I connected two EVMs on each eth0 port with ethernet cable directly. It looked operating normally. But when I connected two EVMs and PTP supported network switch(RSG-2488), AM 572x didn't work. It looks like that it could not catch timestamp messages from other devices. 

  • Please post which Linux version you use.

     

    Best Regards
    Biser
  • In reply to Biser Gatchev-XID:

    Kernel version is Linux-RT 4.14.79 

  • In reply to user5129152:

    Hi,

    Is there another switch that you could use besides the one you are using? Perhaps one that is PTP capable to make sure all the packets are reaching there destination? When you say could not catch the time stamps is that because the PTP packets were being blocked by the switch you are using? Are you able to see the PTP packets being received by the AM572?

    Best Regards,
    Schuyler
  • In reply to Schuyler Patton:

    I only used one switch. I watched the packets by the wireshark program. I tried ping test by the AM572x board to grand master clock. I saw that the sending message was from the eth3 port in AM572x boards, but the destination port was not same, eth2.

  • In reply to user5129152:

    Hi,
    Could you please attach a block diagram of the nethwork topology? Where is the eth2 port located that you are describing?
    Best Regards,
    Schuyler
  • In reply to Schuyler Patton:

    Hi,
    Since we have not heard back we will assume that you were able to move past the issue and close the thread.
    Best Regards,
    Schuyler

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