[ntp:questions] PPS on Linux status?

Ulrich Windl Ulrich.Windl at RZ.Uni-Regensburg.DE
Fri Jun 22 15:40:22 UTC 2007

Martin Karsten <mkarsten_NOSPAM_ at uwaterloo.ca> writes:

> My apologies if I am beating a dead horse, but I've spent several hours
> today searching for a definite answer to the subject line question.
> The PPS part of the ntp documentation at one point refers to the PPSkit
> for Linux and at another point says "The FreeBSD, Linux and Solaris
> implementations can be used with the stock kernels provided with those
> systems;" about the ntp PPS driver.

Just add the date of that quote...

> I understand that a full-scale PPS "system" in the kernel (and the PPS
> api) may not be needed to get ntp working with PPS (e.g. that seems to
> be the case for Solaris), but at least some level of support is probably
> required from the kernel (in the serial driver)? Does the stock Linux
> kernel (e.g. any recent 2.6 variant) support PPS or do I have to use an
> extension such as PPSkit to use a PPS signal on Linux for ntpd?

No, because nobody wrote the code.

> I have a setup (server GPS/PPS) for which on a FreeBSD
> machine, ntptime shows the PPSSIGNAL status bit, but not on Linux.

Just use the last PPSkit for Linux kernel 2.4.

> Any help would be greatly appreciated.
> Thanks,
> Martin

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