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Temperature dependent on DDR memory calibration ? Reason for kernel panic when the imx6q system get heat-up ?

Question asked by Peter Amond on Jul 22, 2017
Latest reply on Jul 24, 2017 by Peter Amond

Hi All,


I have done DDR memory calibration for my imx6q custom hardware design in ambient temperature and got proper and reliable read,write,dqs gating values for DDR memory. And I updated u-boot configs according to those values. 


But when the system get heat up; as an example when the die temperature of the imx6 exceed 55C the system shows kernel panic. It is difficult to identify the reason using the errors pop-up in kernel panic using program counter. (May be this is not a reason in processor because imx6 can work up to 85C without de-clocking) 


  1. Do we need to do DDR memory calibration in different temperatures before do the updates in u-boot ? Any dependency on memory calibration on temperature ?
  2. How can we get temperature profile using few thermocouples which were placed on different areas of DDR memory chips, imx6 processor and etc by using imx6q libraries ?