On Sat, Nov 19, 2016 at 11:40:03AM -0500, Dale Smith wrote: > Interesting. Do you think it's possible to rewrite the driver to > use whatever HW support is available? Or is the HW so broken that > they had to do it in SW?
The HW PLLs on the am335x are not stable, and so when you dial a non-zero frequency adjustment, the clock goes bonkers. There is no SW work around that I am aware of. > Yeah, if you can't wiggle an I/o pin precisely based of the 1588 > clock, what's the point of the clock? Well, you can synchronize this PHC reasonably well via PTP, and then use phc2sys to get the system time globally correct to within a few microseconds, so it is not totally useless. but you are right, it is a shame that this HW unit is so poorly designed. Thanks, Richard ------------------------------------------------------------------------------ _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
