Tachometer Overflow is detected in jetson

Robotics & Edge Computing Jetson & Embedded Systems Jetson Orin Nano
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1

When I was in the system of jetson nano, the following log suddenly appeared:
What I want to know is what caused this? Or is there any deb that I did not install correctly?
Note: My root file system is cropped

[  221.986602] pwm-tegra-tachometer 39c0000.tachometer: Tachometer Overflow is detected
[  669.986367] pwm-tegra-tachometer 39c0000.tachometer: Tachometer Overflow is detected
[  871.987393] pwm-tegra-tachometer 39c0000.tachometer: Tachometer Overflow is detected
[  911.986452] pwm-tegra-tachometer 39c0000.tachometer: Tachometer Overflow is detected
[ 1063.987190] pwm-tegra-tachometer 39c0000.tachometer: Tachometer Overflow is detected
[ 1107.987349] pwm-tegra-tachometer 39c0000.tachometer: Tachometer Overflow is detected
3

Is this a NV devkit or custom board? Or you are not sure?

4

The core board is jetson nano4G, and the base board is a custom board, but the hardware circuit design is based on the official design.

5

Is GPIO08 in use on your custom board design?

6

Yes, The speed ​​feedback signal is connected to GPIO08

image
image845×308 78.4 KB

7

Could you check if the fan PWM and RPM are fine when this error happeneed?

You could check with this command

while true; do cat /sys/class/hwmon/hwmon*/{pwm1,rpm}; sleep 0.5; done
8

when the error occur, the both of data(pwm1 and rpm) will be set to zero, the log is as follows:

image
image282×534 1.54 KB

9

When the error not occurred, did these value correct on your board?

10

Yes, when no error occurs, the value is normal

11

BTW, what does that mean your rootfs is cropped?

12

Yes, due to project requirements, our root file system is trimmed, but we still retain the fan control service

13

Is same module reproduce same issue if putting it on NV devkit?

14

I placed the core board on the NV devkit and ran it for half an hour without this problem.

15

And what is the PWM value before hitting this issue? Did you trigger any loading on the board to make the FAN spin faster to hit this error? or even put it in idle would trigger the error?

16

Let me paste a more complete log: (Running in Idle)

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image735×708 5.24 KB

I checked it when it was unloaded and I found that its value does not seem to be in a stable range. Sometimes the value is large, sometimes it is small. I use the automatic control service of the fan.
log.txt (7.9 KB)

17

Could you also check your tegrastats or power GUI (as root) and see what is the status of thermal condition when this issue happened?

18

OK, let me also paste the log when running the tegrastats command
tegrastats.log (26.0 KB)

In addition, I found a problem. The nvpmodel service of my jetson nano cannot work properly. The error log is as follows:

nvpmodel.log (1.2 KB)
Could you tell me what went wrong?