[ntp:questions] Embedded solutions

David Lord snews at lordynet.org
Mon Jul 7 20:38:13 UTC 2014


Rob van der Putten wrote:
> Hi there
> 
> 
> Jaap Winius wrote:
> 
>> Has anyone here managed to turn a relatively cheap, ARM-based embedded
>> system with a serial port into a decent stratum 1 NTP server?
>>
>> Thus far I've always attached my GPS and radio time signal receivers to
>> much larger x86 hardware platforms, but those machines have other things
>> to do and make the NTP server less stable than it can be. However, if I
>> were to use dedicated hardware for the NTP server, I'd rather it power-
>> efficient and as cheap as possible.
>>
>> I've looked at the BeagleBone Black (with an RS232 Cape)
> 
> AFAIK the BBB 232 cape doesn't support DCD, so PPS is not available.
> 
>> and the
>> Wandboard (both ARM platforms),
> 
> Same problem.
> 
>> but have not had any success with them.
>> There are stories stories of people who have done it with Soekris
>> hardware (x86), but that's much more expensive.
> 
> AFAIK Soekris has a 'regular' serial port.
> 


I'd have to look this up but think board using Elan 486 used the
on chip high speed timer to timestamp the pps input at a gpio
port along with a custom ntpd on FreeBSD to obtain sub us offset.


David

> 
> Regards,
> Rob



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