Re: [Linuxptp-users] Synchronization fault with stmmac

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

On Tue, Mar 25, 2014 at 02:38:29PM +0100, Mohamed Belaouad wrote:

> Considering that the drivers sets the max adj to 62,500,000, I
> should be able to set the ppb ajustment up/down to -+62,500,000 from
> my understanding.

Yes, that is correct.

> However, when printing the value passed to the driver with testptp I get:
>    Value passed to testptp | Value printed at the entry of the driver function
>        > +32,768,000       |   -32,768,000
>        < -32,768,000       |   -32,768,000

I guess you are on a 32 bit platform. In that case, the size of the
adjustment is limited by the timex.freq field. See linuxptp/phc.c.

> Please excuse me if it is a misunderstanding on my part.

I thought you meant that the kernel should check that the dialed
frequency offset is within the bounds of [-max_adj, +max_adj].
That is a different issue.

Thanks,
Richard