Re: [Linuxptp-users] question on "-a" option in phc2sys (and boundary clock etc.)

[Keller, J. E <jac...@in...>]

> -----Original Message-----
> From: Richard Cochran [mailto:ric...@gm...]
> Sent: Wednesday, May 22, 2019 7:03 PM
> To: Sanjay Bhandari <sa...@zi...>
> Cc: lin...@li...
> Subject: Re: [Linuxptp-users] question on "-a" option in phc2sys (and boundary clock
> etc.)
> 
> On Wed, May 22, 2019 at 04:01:18PM -0400, Sanjay Bhandari wrote:
> > My question is about the scenario where they do share the same hardware
> > clock (as described in the manual).
> 
> The only HW I know is the Freescale (nxp) ETSEC with three ports, all
> sharing one clock.
> 
> Maybe there are other such devices, but I haven't seen them or even
> heard of them.
> 
> Thanks,
> Richard
> 

Several of the Intel cards share the same clock source internally, but there's no way to keep all the registers in sync, so they have to be treated as just a bunch of clocks.

Thanks,
Jake