AnsweredAssumed Answered

questions about MMDC Linux driver in BSP

Question asked by ko-hey on Feb 6, 2018
Latest reply on Feb 9, 2018 by Yuri Muhin

Hi all


I have issue and questions about MMDC Linux driver in BSP L4.9.11.
It is a problem that a running CPU stops suddenly.
Of course it is possible to recover with the WDT, but I want to find out the cause.

Break down the issue into parts, I found that the issue is DDR and CPU communication.
Then I tested with DDR Stress Test V2.8 and it passed.
On the other hand, the Read/Write test with Linux failed.


As a result, I guess something is wrong with the Linux driver.
Could you teach me following questions ?

In my understanding, all of the process and sequence in the drivers are based on the completion flag.
Am I correct ?


I konw that the characteristics of the LSI changes with temperature.
Is the driver of the evaluation board made assuming about low and high temperature condition as well ?


Is there a possibility of deviating from the timing spec described in the data sheet at low and high temperature ?