Re: [Linuxptp-devel] Debugging ptp4l

[Drasko D. <dra...@gm...>]

Hi Richard,

On Thu, May 30, 2013 at 4:41 PM, Richard Cochran
<ric...@gm...> wrote:
> On Thu, May 30, 2013 at 03:36:17PM +0200, Drasko DRASKOVIC wrote:
>
>> ptp4l[106799.964]: poll tx timestamp failed: Success
>> ptp4l[106799.964]: port 1: send sync failed
>>
>> What is happening here and how to debug this ?
>
> Your MAC driver is lacking transmit time stamp support. I don't know
> what the pandaboard has (davinci_emac?), but you would need to add a
> call to
>
>  * skb_tx_timestamp() - Driver hook for transmit timestamping
>  *
>  * Ethernet MAC Drivers should call this function in their hard_xmit()
>  * function immediately before giving the sk_buff to the MAC hardware.
>
> in your MAC driver.

Thanks for this information and for your help.
I was suspecting that this is the source of error, as it has been
discussed earlier on this list, but error :
port 1: MASTER to FAULTY on FAULT_DETECTED (FT_UNSPECIFIED)
is difficult to understand,

By the way, what are port 0 and port 1?

I will grep for some examples, to see how it is currently done in the kernel.

Is there any example for wlan drivers that I can take - what would be
the most quick and dirty way, just to have all tools in place. I will
work later on precision, for now I just want something that compiles
and that make server and client communicate (even if the timestamps
are imprecise).

Best regards,
Drasko