Re: [Linuxptp-users] Synchronization fault with stmmac

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

On Tue, Mar 18, 2014 at 09:31:19AM +0100, Mohamed Belaouad wrote:

> The core registers of the IP are the same. To me, everything seems
> fine with the registers addresses related to the
> reception/transmit/timestamping.

Did you consider that the input clock to the time function within the
IP core might be at a different frequency than the driver expects?

> Yes, I also guess it is coming from the driver. I just want to make
> sure that it is not a misconfiguration on my settings.

>From the git log of drivers/net/ethernet/stmicro/stmmac it appears
that people have been using linuxptp with this driver and "normal"
hardware. I would not discount the possibility that the Altera
implementation is somehow buggy in hardware.

> I think it is time to dig into the driver again (>,<).

The first step is to see whether the basic clock operations work or
not by using the testptp program.

Thanks,
Richard