Does Jetson not monitor the FAN_TACH signal?

nVIDIA Staff.

Even if the FAN is forcibly stopped while the FAN is rotating, the message that the FAN is locked does not appear.
In R28.1 based Linux / Jetpack, is not FAN lock detection done?

In the developer kit, the FAN_TACH signal is connected to Jetson, but is there a mechanism of Tegra that can detect locking?

best regard.

This FAN TACHOMETER is not support on TX1 but TX2.
You can find the REG from TX2 TRM, and kernel driver locate …/kernel/t18x/drivers/tachometer/*


Thank you for answering.

How to install the tachometer driver?

best regard.

For TX2 I believe it already build in the default kernel Image.


Our Platform is Jetson_TX1…

Right as I say this function not support on TX1.

Impossible to install driver? (…/kernel/t18x/drivers/tachometer/)

Is Jetson_TX 1 hardware not supported?

Yes, I am sorry TX1 chip not support it.

Hi @ShaneCCC

Can you explain exactly why TX1 doesn’t support it?

To me this doesn’t make sense at all… unless TX2 has a hardware timer counter which is used to count the revolutions with that the TX1 doesn’t have…

Please explain.


You can check the TX1/TX2 TRM to know it. TX2 have relative “Tachometer” registers but TX1 didn’t have it.