12.2.7.3 Monitor Disabling by the Bootstrap

It is highly recommended to disable the Secure Monitor feature for systems in production. To do so, the MON_DIS word must be filled and the Boot Configuration Packet must be locked at the production stage.

If that has not been done, writing the “MON_DIS” word can be performed by the bootstrap or by the customer application, but only if the Boot Configuration Packet has not been locked.

To write the “MON_DIS” word and lock the packet, an update of the Boot Configuration Packet in the OTP memory is required. In the section OTP Memory Controller (OTPC), refer to:

Updating an Existing Packet from the User Interface
Locking a Packet