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About the behavior of the nRST signal at SD Boot with i.MX6UL

Question asked by yuuki on Nov 17, 2015
Latest reply on Nov 17, 2015 by igorpadykov

Dear all,

 

We made a board using i.MX6UL.
We use SD Boot.

 

However, after Bootloder started, the system stops.

We confirmed each signals.
After Bootloader started, nRST signal becomes Low when Kernel starts.
Therefore we found that SD_3V3 became OFF.

 

We confirmed each signals in SD Boot with EVK board.
In EVK board, similarly, nRST signal becomes Low.
SD_nRST.png

However, SD_3V3 does not become Low because there is C1706.

SD_nRST schematic.png

Therefore I understand that EVK board does not have a problem.

 

When Kernel starts, why does nRST signal become Low?

Would you tell me the method avoiding this?

 

Best Regards,
Yuuki Murasato

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