[Linuxptp-users] Multi-clock sync for AVB in a network switch

[Liyong Z. <ont...@ho...>]

QUESTION: Can linuxptp set/adjust for multiple ptp clocks in a switch?

HARDWARE: Switch with 3 Marvell chips interconnected, each exposes a /dev/ptpN and 8 Ethernet ports.

SOFTWARE: Linuxptp 1.92 (going to 2.0) (Thanks to Richard and others!) with gPTP.cfg and boundary_clock_jbod=1.

ISSUES: The three ptpN are not sync-ed, with Grandmaster of itself or an external device. Tried to use "phc2sys -a" but it waits for ptp4l forever. Then, brute-force:

    "phc2sys -c /dev/ptp3 -s /dev/ptp1 -O 0 &"
    "phc2sys -c /dev/ptp2 -s /dev/ptp1 -O 0 &"

where ptp1 is sync-ed by linuxptp and has the Grandmaster connected. This made AVB audio working.

Advises are appreciated!

Liyong