SPRUIV7B May 2022 – September 2023 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP
The secure bit of DSS0_COMMON1_DISPC_SECURE register is set/reset by a secure transaction. When the secure bit has been set, the software in "secure mode" is responsible for checking the DISPC configuration. The secure bit is propagated by DISPC to the system Interconnect in order to qualify all DISPC requests as secure or non-secure requests, based on the secure bits defined in the control register.
When DISPC accesses the frame buffer, in the case the secure bit has been reset and the frame buffer has been set secure, the display controller will receive an "error" in response of non-secure requests.