Hello,
I have just tested MIMX8MD6CVAHZAB (dual Industrial) MIMX8MQ5CVAHZAB (quadlite industrial) and MIMX8MQ6CVAHZAB (quad industrial) under negative temperature range in Environmental chamber. The iMX8M do not boot-up under 0°C.
There is output from console:
U-Boot SPL 2020.04-imx_v2020.04_5.4.24_2.1.0+g4979a99482 (May 30 2020 - 06:50:01 +0000)
power_bd71837_init
Detected board nr:7
RAM size:4
DDRINFO: start DRAM init
DDRINFO: DRAM rate 3200MTS
DDRINFO:ddrphy calibration done
DDRINFO: ddrmix config done
Normal Boot
Trying to boot from MMC1
U-Boot 2020.04-imx_v2020.04_5.4.24_2.1.0+g4979a99482 (May 30 2020 - 06:50:01 +0000)
CPU: i.MX8MQ rev2.1 1300 MHz (running at 800 MHz)
CPU: Industrial temperature grade (-40C to 105C)CPU Temperature (112000C) has beyond alert (80000C), close to critical (90000C) waiting...
CPU Temperature (112000C) has beyond alert (80000C), close to critical (90000C) waiting...
CPU Temperature (112000C) has beyond alert (80000C), close to critical (90000C) waiting...
CPU Temperature (112000C) has beyond alert (80000C), close to critical (90000C) waiting...
CPU Temperature (112000C) has beyond alert (80000C), close to critical (90000C) waiting...
And it keeps reading temperature until it reach 0°C or 1°C and then it starts properly.
Inside Environmental chamber it is like -10°C or -20°C or -40°C and iMX8M anyway reading temperature 112°C. I tested multiple CPUs even in Commercial range and all testing ended up with the same result. CPU Temperature (112000C)
So I am wondering is there any setting in bootloader ? Any recommendation ti fix it ?
Thank you
