Hallo Reid,
I am about to use PTP on my Altera Cyclone V. I want to use the altera 1588
solution IP core. Iam using quaturs to set my system .. Please could you
let me know what variable I should enable in the configuration, also which
PTP open software do you use. Will it work by using the PTP Linux one? or
is there a version for NIOS Altera.
I thank you in advance for your help,
Baya
2017-05-22 7:17 GMT+02:00 Phil Reid <pr...@electromag.com.au>:
> On 18/05/2017 23:29, Hunter Olson wrote:
> > John,
> >
> > I'm going through the same troubles right now on Altera's Cyclone V SOC
> platform.
> >
> > I've found that if no PTP clock is specified for the emac entry in your
> device tree, the stmmac driver defaults to expect the emac clock (250Mhz),
> but it seems
> > Altera is feeding in the eosc1 clock (25mhz). If you run the testptp
> application, you'll see the ptp clock is running at 1/10th speed. This is
> causing ptp4l
> > to throw those 'clockcheck' warnings that you're seeing.
> >
> > See _https://github.com/torvalds/linux/commit/
> bf171f01afe31f0c593deb55b96c3cb9e20cd6dd_
> > <https://github.com/torvalds/linux/commit/bf171f01afe31f0c593deb55b96c3c
> b9e20cd6dd>for how to add the ptp clock to your device tree, allowing the
> driver to grab
> > the correct ptp clock rate.
> >
> > I also backported to Altera's 4.1.22 some ptp related commits that show
> up in mainline kernel 4.5, such as:
> > _https://github.com/torvalds/linux/commit/19d857c9038e5c07db8f8cc02b5ad0
> cd0098714f
> > <https://github.com/torvalds/linux/commit/19d857c9038e5c07db8f8cc02b5ad0
> cd0098714f>_
> >
> > Like you noticed, I had to bump ptp4l's tx_timestamp_timeout up to 100.
> >
> > Still testing, but it appears LinuxPTP H/W timestamping works after
> these changes.
>
> From memory there where also issues with the ptp clk config and resets
> with those older kernels.
> Some related patches to things I had tofix to get it going..
>
>
> https://github.com/torvalds/linux/commit/734e00fa02eff5003827abc06a7ebf
> 9449349109
> https://github.com/torvalds/linux/commit/e6dbe1eb2db0d7a14991c06278dd30
> 30c45fb825
> https://github.com/torvalds/linux/commit/43569814fa35b2ae68f09780c4ee3d
> 4a182711e9
> https://github.com/torvalds/linux/commit/27015f8c17578e14b3c6cc098b915b
> 0f8db3ac36
>
>
> --
> Regards
> Phil Reid
>
>
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