Time and Data not counting while RTC battery is used

[naserie97]

I have a Jetson ORIN NX, when powering off the device and powering it on again the clock remain the same like if the clock now is 4 PM and I powered off the device and power it on again in the next day at 8 AM, the clock is still 4 PM knowing that there is no internet connection to the device.

I got the devoce from Seed reComputer J4012, the board has an RTC Socket for the battery CR1220, I have got the battery and insert it to the socket and nothing happened.

What do I need to do in order to keep the time counting in jetson while it powered off and not power cable is connected to it.

Thank you

[DaveYYY]

Hi,

Please first run this to check what RTC source the device is using:

ls -l /dev/rtc

If it shows rtc1, then follow this post to make it use rtc0:

AGX Orin: rtc0 vs rtc1

There are 2 real time clocks on Orin: rtc0 and rtc1. The rtc0 can be supported by the battery, but rtc1 cannot. The kernel however is configured to sync time with rtc1, which causes the time to be incorrect at the boot, until it is synced with network time. Are there specific reasons for kernel using rtc1? Are there any known issues with re-configuring the kernel to use rtc0?

[naserie97]

@DaveYYY

:

the post, has been followed and it as bee changed to rtc0. However the time still the same after turning off and turning on the device.

how to do a patch to set default rtc to rtc0 (PSEQ_RTC)?

and thank you

[DaveYYY]

@DaveYYY

ls -l /dev/rtc

If it’s already rtc0 now, that means all software changes are done, and please check your hardware setup.

[naserie97]

The command shows rtc0, the time still the same after turning off and turning on the device.

[DaveYYY]

Ask the vendor as it sounds like a hardware issue.