nano clock issue

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

Hi NV people

i can’t find rtc in system.
could you get some information?

nano@nano-desktop:~$
nano@nano-desktop:~$
nano@nano-desktop:~$ hwclock -r
hwclock: Cannot access the Hardware Clock via any known method.
hwclock: Use the --debug option to see the details of our search for an access method.
nano@nano-desktop:~$
nano@nano-desktop:~$ hwclock --debug
hwclock from util-linux 2.31.1
System Time: 1560313730.516148
Trying to open: /dev/rtc0
No usable clock interface found.
hwclock: Cannot access the Hardware Clock via any known method.
nano@nano-desktop:~$
nano@nano-desktop:~$
nano@nano-desktop:~$
nano@nano-desktop:~$ uname -a
Linux nano-desktop 4.9.140-tegra #1 SMP PREEMPT Wed Mar 13 00:32:22 PDT 2019 aarch64 aarch64 aarch64 GNU/Linux
nano@nano-desktop:~$
2

Need to run the command from supervisor mode.

root@nvidia-desktop:/dev# hwclock --debug
hwclock from util-linux 2.31.1
System Time: 1560328594.126262
Trying to open: /dev/rtc0
Using the rtc interface to the clock.
Assuming hardware clock is kept in UTC time.
Waiting for clock tick…
…got clock tick
Time read from Hardware Clock: 2019/06/12 08:36:35
Hw clock time : 2019/06/12 08:36:35 = 1560328595 seconds since 1969
Time since last adjustment is 1560328595 seconds
Calculated Hardware Clock drift is 0.000000 seconds
2019-06-12 16:36:34.302358+0800