Set LS1028 core_cluster_crit to 113℃ but it reboot at 107℃

[xinliwang]

Hi,

I wanna test the highest temperature that LS1028 board can reach. I set the core_cluster_crit on dtsi file from 103℃ to 113℃. But the board reboot at 107? why it could not hit 113℃？Is there any other strategy on ls1028 to protect the cpu from high temperature?

[June_Lu]

Please raise a new subject to the query.

[June_Lu]

Please raise a new case to track the new question.

[June_Lu]

TMU module is implemented on the LS1028A, Accuracy within ±5°C.

The maximum operating temperature of the chip should not exceed that specified in the data sheet. For more information, refer the LS1028A data sheet.

Please confirm the Tj  LS1028A data sheet page 65 Table 3 according to your part number, setting this value decide by items below:

Tj of the part number,  LS1028A data sheet page 65 Table 3

TMU accuracy LS1028ARM page 3706, 31.1 The TMU module as implemented on this chip NOTE

 Margin of your production application, but should not exceed Tj.

[xinliwang]

Hi, @June_Lu 

I wonder Is Tj can be changed and how can I change it?

Thanks 

[xinliwang]

Hi @June_Lu 

Thank you for your reply;

We been testing the LS1028A Thermal Power recently. Accourding to the reference file 

QorIQ LS1028A Design Checklist page 9 and 10, the power consumption can decrease significantly by cutting down one core( 1028 -> 1018). But in reality, I didn't see any change by useing just one core. 

The command I used is "echo 0 > /sys/devices/system/cpu/cpu1/online"

Besides, I tried to change the CPU frequency to 300Mhz. Compared to 1.5Ghz, it didn't decrease any power consumption from I saw. 

How do I low down the power consumption? The ls1028 temperature is too high for us （107℃）when the environment temperature reach 83℃。And when the ls1028 board temperature reach 107℃, it started rebooting. 

Thanks