On Wed, Jul 29, 2015 at 02:46:34PM +0200, Juan Solano wrote: > I am learning about PTP and doing tests on 2 Beaglebone Blacks running a > recent stable linux (v3.18.16) with disabled dynamic ticks. They support > hardware timestamping and I have synchronized the system clocks to the > PHC. My logs show what seem to be good values:
... > However, when comparing the PPS GPIO outputs with an oscilloscope I can > see them varying in a range of +- 800 ns. The CPTS in the AM335x does not have any hardware output signals. The PTP clock cannot be adjusted because of silicon bugs, so we leave the hardware clock free running and use a software clock as a work around. > Can anybody point me at something obvious that I am missing or how to > investigate further? Tell us how you are generating the PPS. Thanks, Richard ------------------------------------------------------------------------------ _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
