[time-nuts] Soekris NET4501, NTP, PPS and "Inappropriate ioctl"

[Mike S]

At 07:59 PM 11/1/2010, mike cook wrote...
>  pps1 -> cuau1 should do it. I am running 6.2 where  pps1 -> cuad1 
> works fine.

Thanks, but actually, I had all that correct. (pps0 -> elan-mmcr, 
oncore.pps.0 -> cuau1, oncore.serial.0 -> cuau1). Unless you get pps 
from elan-mmcr, I'm pretty sure you don't pick up the special qualities 
of the high res NET4501 timer.

My error was to fat-finger a file name, the elan-mmcr driver doesn't 
like it when it doesn't have an input because you saved the file as 
"sysctl.con" instead of "sysctl.conf". So, for the archives, 
"Inappropriate ioctl" can be caused by not having the gpio lines 
properly configured.

Something else I discovered - somewhere along the line, NTP breaks with 
this - with both an Oncore and an Atom (PPS) refclock, NTP always marks 
the Atom as a falseticker, even if "server 127.127.22.0 true..." is 
specified, and even if they're consistently ticking within a few 
microseconds of each other. That happened with NTP 4.2.7p5_1. Going 
back to 4.2.4p5, they work fine together, although the Oncore gets 
marked as a "candidate" instead of a "peer".