I wonder if anyone has the experience with using the Coresight ETM on Allwinner H5. I found the ETM address space, but the Trace registers are not visible. All I can see is the Management registers pool. I have already compiled the kernel with Coresight features and added the ETM to the device tree. The device is correctly recognized as ETM, however the driver is not able to read the revision (which is one of the Trace registers).

Do you have some hints of how to access the trace registers, or maybe you could confirm that they are not accessible?