Hi coresight team,

In ARM ETM specification for ETM4.0 to 4.2, TRCAUTHSTATUS contains NSNID, showing whether non-invasive debug is disabled.

And In ARM Coresight Specification 3.0, NSNID field is 0b10 (supported and disabled) if (NIDEN | DBGEN) == FALSE.

And In ARM architecture manual for ARMv8-A, in K2.1:

DBGEN is for external debug enable.

NIDEN is for external profiling and trace enable.

So it seems if DBGEN and NIDEN is disabled by hardware, even if the intention is to disable external debug interface, ETM is totally

disabled. And there is no way to use it for self-hosted tracing.

Is it true? And if yes, is there any plan to solve it in the future?

Thanks,

Yabin