tx2 rtc issue

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

Hi NV people

i have question about our carrier board rtc.
it’s my test step as below

1. With rtc battery

A.	Boot up the system
B.	Use manual mode to modify the date
C.	Power off the device
D.	Plug off the rtc battery
E.	Plug on the rtc battery
F.	Boot up the system
G.	sudo hwclock –r

the result is “Sat 01 Jan 2000 01:00:35 AM UTC”

2. Without rtc  battery

A.	Boot up the system
B.	Use manual mode to modify the date
C.	Power off the device
D.	Boot up the device
E.	sudo hwclock –r
the result will keep value after modify

3. with or without rtc battery

A.	Boot up the system
B.	Use auto mode to set the date
C.	Power off the device
D.	Boot up the device
E.	sudo hwclock –r
the result will keep value after modify

Q1:
this date “Sat 01 Jan 2000 01:00:35 AM UTC” is RTC factory reset value
or tegra will set this date when removed the battery ??

Q2:

Did the device have battery or not , the new date information will be keep in auto mode ?

2

Hi, it is reset default value. There is a 0.1uF cap in module which can keep the date setting for a short while.