We have observed the real-time clocks on our e310s get reset when powered-off & the ac power cable is removed
e.g.: # set hwclock from systime root@ettus-e3xx-sg3:~# date Mon Nov 6 10:02:36 UTC 2017 root@ettus-e3xx-sg3:~# hwclock --systohc root@ettus-e3xx-sg3:~# hwclock Mon Nov 6 10:03:03 2017 0.000000 seconds ======shutdown, remove/insert ac power & reboot ======== root@ettus-e3xx-sg3:~# hwclock Sat Jan 1 00:00:16 2000 0.000000 seconds Is there supposed to be a battery back-up on the RTC to keep it ticking with no external power?
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