Imx6ul CPU Temp Sense
From embeddedTS Manuals
The i.MX6UL CPU has an internal TEMPMON peripheral that is supported by Linux's Thermal Zone management. This on-die sensor is meant to measure of the thermal state of the CPU for throttling control. This can be read via the Linux kernel's sysfs (/sys) interface. The following command returns the temperature in millicelsius:
cat /sys/class/thermal/thermal_zone0/temp