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How to power up the debug power domain in iMX53 qsb?

Question asked by Zhenyu Ning on Oct 5, 2017
Latest reply on Oct 13, 2017 by Zhenyu Ning

Hi all,

I am going to use the ETM on the iMX53 qsb, it is located on the cortex-A8 processor. I found the physical address (0x40002000 - 0x40002FFFF) of the control registers from the manual, and tried to use ioremap or devmem2 to access this memory region, the board just stuck there.

 

I believe this is caused by the power domains. The ETM is in the debug power domain, which is not usually powered up. From my previous experience, i may use the System Control and Power Interface (SCPI) to communicate with something like the System Control Processors (SCP) to power up that power domain, but i don't really know how to do it in iMX53 qsb. Does anyone know how to do it?

Appreciate for any discussion and help!

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