Re: [Linuxptp-users] Problems with hardware time stamping with PHY DP83640 on MCP5200 powerpc platform

[Richard C. <ric...@gm...>]

On Wed, May 23, 2012 at 04:54:42PM +0200, Mario Molitor wrote:
> >I have never seen the combination MPC5200/DP83640. Is this a
> >commercial board or a custom design?
> 
> It is custom design. We design a module for our data acquisition systems.

Here are two ideas to think about.

1. Perhaps the PHY device driver instance is not properly associated with
   the FEC driver instance. Have you checked your DTS?

2. The PHY sends the time stamps to the MAC using special "status"
   frames. Perhaps your MAC is dropping these frames? They are sent
   with a DST MAC address like this:

   static u8 status_frame_dst[6] = { 0x01, 0x1B, 0x19, 0x00, 0x00, 0x00 };

HTH,
Richard