[Linuxptp-users] phc2sys[273995.639]: failed to read clock: Invalid argument

[Pham, C. <Cal...@ne...>]

Hi all,
I've been trying to run phc2sys but it kept print this message on the screen and the system clock was found not able to sync to /dev/ptp0. My command was: ./phc2sys -w -s /dev/ptp0 -m
phc2sys[273995.639]: failed to read clock: Invalid argument
phc2sys[273996.639]: failed to read clock: Invalid argument
phc2sys[273997.639]: failed to read clock: Invalid argument
phc2sys[273998.639]: failed to read clock: Invalid argument
phc2sys[273999.639]: failed to read clock: Invalid argument

I am running kernel 3.7.5., intel I350 and linuxptp-1.4. I've found that the print messages came from the function call: clock_gettime(clkid, &tsrc) at line 106 in phc2sys.c:
if (clock_gettime(sysclk, &tdst1) ||
                              clock_gettime(clkid, &tsrc) ||
                              clock_gettime(sysclk, &tdst2)) {
                              pr_err("failed to read clock: %m");
                              return 0;
               }
I forced the code to ignore the error by commenting out "return 0", phc2sys seemed to work fine; I mean the system clock was able to sync to /dev/ptp0 fine.  Does anyone know why?

Thanks!

Calvin Pham