[ntp:questions] Second attempt at GPS-18 based NTP server

Thomas Laus lausts at acm.org
Fri Feb 3 14:21:46 UTC 2012

On 2012-02-03, David J Taylor <david-taylor at blueyonder.co.uk.invalid> wrote:
>> The generic BSD kernel does not enable PPS support by default.  You must 
>> recompile to enable PPS.
>> The page you quoted says the following in the section "System software 
>> customization" (about 45% down the page in the Software section):
>> System software customisation
>> Need to add one line to the Kernel configuration:
>>     options PPS_SYNC
>> and recompile the Kernel.  On my 133MHz/48MB system this can take 
>> several hours.  Note the configuration suggestions below before you 
>> recompile the kernel.
> But that was FreeBSD 5.4 and some six years ago.  Note that I did not make 
> the same remark about FreeBSD 8 - so whether that does or does not need 
> recompiling is something I don't currently know.
The need to make a custom kernel that includes option PPS_SYNC is
still true on the recently released FreeBSD 9.0.


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