Behaviour related to JTAG_HEO and KTE bits on i.MX 8M Plus

[fr5]

Hi,

On a device with the following configuration :

SEC_CONFIG[1]=1 : Closed (Security On)

JTAG_SMODE[1:0]=11 : No debug mode

SJC_DISABLE=1 : Secure JTAG Controller is disabled

JTAG_HEO bit is not set : is it possible to enable JTAG debug access with HAB ?

KTE is not set : is it possible to allow bus tracing ?

Regards

[JorgeCas · Accepted solution]

Hello,

JTAG_HEO bit is not set : is it possible to enable JTAG debug access with HAB ?

Since you have configured JTAG_SMODE as No debug mode, this is the highest security level where JTAG debug is disabled.

JTAG_HEO is intended to be used when JTAG_SMODE = Secure and HAB enable/disable JTAG debug access. This bit overrides HAB_JDE behavior.

KTE is not set: is it possible to allow bus tracing?

Yes, bus tracing is allowed.

Best regards.