I am using vendor kernel and a vendor-specific PTP driver (drivers/net/Ethernet/freescale/fec_ptp.c). I see this driver in the mainline kernel as well. What enables PPS output signal is the PTP_ENABLE_PPS ioctl sent from linuxptp stack (in phc2sys.c).
-----Original Message----- From: Richard Cochran [mailto:richardcoch...@gmail.com] Sent: Tuesday, August 18, 2020 3:27 PM To: Irene Kravets <ire...@sapling-inc.com> Cc: linuxptp-users@lists.sourceforge.net Subject: Re: [Linuxptp-users] Can ptp4l be used without phc2sys? On Tue, Aug 18, 2020 at 12:34:55PM +0000, Irene Kravets wrote: > I'd still like to understand why I get synchronized 1PPS signals (with > 2 usec delay) when I run both ptp4l and phc2sys, but if I only run > ptp4l, the 1PPS signals are not synchronized? To clarify, with only > ptp4l running, the 1PPS signals from master and slave don't drift > relative to each other, but the delay between the signals is totally > random on each boot. However, if I run ptp4l and phc2sync, the delay > is always between 2 and 3 usec. Any ideas on why this is happening? I wouldn't expect a PPS output signal in either case. Normally you would have to enable the PPS output explicitly. Probably you are using a vendor kernel with the vendor's hacks? Or are you using an unaltered mainline Linux kernel? Thanks, Richard _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
