[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 127.127.20.0 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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