Apalis IMX6Q CPU temperature read failure

Technical Support
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1

Hi,
I was trying to make a script to monitor CPU and baseboard temperature, but I was unable to read the first one. It looks like a device driver problem, because thermal’s sys paths do not exist:

root@apalis-imx6q:~# cat /sys/devices/virtual/thermal/thermal_zone0/temp
cat: /sys/devices/virtual/thermal/thermal_zone0/temp: No existe el fichero o el directorio
root@apalis-imx6q:~# cd /sys/class/thermal/
root@apalis-imx6q:/sys/class/thermal# ls -lthr
total 0
root@apalis-imx6q:/sys/class/thermal#

I have checked kernel log files and I did not find errors. I am using a custom kernel image built from 3.14.52 source, without any changes on drivers.

Thanks for your help and advices.
Regards.

2

Hi

The path exists on my unaltered V2.6.1 image.
Can you check if you accidental deleted a kernel option from the .config or the device tree you used?

Max

3

Hi Max, thanks for your response.

Yes, I have checked before posting. Thermal options in my custom .config file are below:

CONFIG_THERMAL=y
CONFIG_THERMAL_HWMON=y
CONFIG_THERMAL_OF=y
CONFIG_THERMAL_DEFAULT_GOV_STEP_WISE=y
# CONFIG_THERMAL_DEFAULT_GOV_FAIR_SHARE is not set
# CONFIG_THERMAL_DEFAULT_GOV_USER_SPACE is not set
# CONFIG_THERMAL_GOV_FAIR_SHARE is not set
CONFIG_THERMAL_GOV_STEP_WISE=y
# CONFIG_THERMAL_GOV_USER_SPACE is not set
# CONFIG_THERMAL_EMULATION is not set
CONFIG_DEVICE_THERMAL=y

Are there any other configuration vars that need to be set?

4

Most possibly you are just missing CONFIG_CPU_THERMAL and/or CONFIG_IMX_THERMAL.

5

Thanks very much for the response.

It is a bit strange, those config options does not appear in my config file. I am shure that I did not delete them. I will add them and recompile. Moreover, I couldn’t find them using menuconfig.

Later, I have done “make apalis_imx6_defconfig” to built the default .config file, added some custom kernel options and save it. That was deleting those config options

Regards.