Re: [Linuxptp-devel] Clarification of PHC and PHY on the supported lists?

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

On Mon, 2013-12-02 at 15:37 -0500, George Neville-Neil wrote:
> Hi,
> 
> I am trying to determine why the hardware timestamping support table only lists PHC and not PHY
> timestamping. Testing on a system with an Intel 82576 NIC, I was unable, even with a very recent kernel (3.10)
> to get PHY level time stamping.  
> 
> Do I need to build a custom kernel for this to work?
> 
> Best,
> George
> 

I am not sure the 82576 NIC actually supports PHY level timestamping. I
believe you have to have PHY and NIC support? (maybe only driver
support?) But this is partly because 82576 driver does not use phylib.
(As far as I know, this is because the PHY is tied more closely to the
board than phylib was designed for...?) I don't know exactly the
details..

Richard do you know more about how PHY level timestamping works?

Regards,
Jake