I had an iMX6 board running steady at <50ns using an external circuit to adjust
the 125MHz
system clock,
from which the AVTP counter is incremented.
It can be done
Richard H
-Original Message-
From: Irene Kravets [mailto:ire...@sapling-inc.com]
Sent: Mittwoch, 19. August 2020 13:49
To
at the physical signal they are using just happens appear as
> an output, or maybe the vendor kernel has extra code to make that
> happen.
Device tree to configure GPIOs and PADs - connect external pins to
Capture/Compare in iMX
Richard Hill
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Some boards (but not yours) have PPS-in direct timestamping. Some iMX6s have
this. You’ll still need to mod the driver as it only handles PPS-out, but
it’s < 25ns accurate once running.
There’s just far too much latency for PPS-in via GPIO to be useful.
Richard H
From: Andrey Vol
> I have a GPS 1PPS signal available and would like to use it to
> distribute time across my home network. The more accurate the better.
>
> GPS > single-board computer --> several PTP client hosts
> 1PPS ethernet
>
> I see that the TI AM355x boards like the Be
> So have you actually connected PPS to an FEC ENET_1588_EVENT#_IN pin on
> the imx, and modify the driver to use this for adjusting clock frequency?
Until very recently, I've not had hardware where this connector has been
available, so
that's why I've had to use the external GPS-PPS/PPS-OUT c
Not directly related to this, but ...
Having spent some time modifying the FEC driver, I can highlight some things to
be aware
of
1. The hardware nanosecond counter is not the same as PTP nanoseconds. PTP time
is held as
a variable, not by FEC
2. The PPS-OUT signal does fire each second, but is n
]
Sent: Freitag, 27. April 2018 20:19
To: Richard Hill
Cc: linuxptp-users@lists.sourceforge.net
Subject: Re: [Linuxptp-users] NULL pointer in port_delay_request
On Tue, Apr 24, 2018 at 05:13:11PM +0100, Richard Hill wrote:
> > Or should the list never be empty at this point ?
>
> Th
>
>
> I am getting a dst NULL pointer here (in port_delay_request)
>
> if (p->hybrid_e2e) {
> struct ptp_message *dst = TAILQ_FIRST(&p->best->messages);
> msg->address = dst->address;
> msg->header.flagField[0] |= UNICAST;
> }
> This appears to be because the li
I am getting a dst NULL pointer here (in port_delay_request)
if (p->hybrid_e2e) {
struct ptp_message *dst = TAILQ_FIRST(&p->best->messages);
msg->address = dst->address;
msg->header.flagField[0] |= UNICAST;
}
(gdb) p dst
$13 = (struct ptp_message *) 0
