Customer have issue about flash program, the flash blocks cannot program again after enabling CSE secure boot.
After check the C55FMC registers status and found that OPP registers are set with 1 means blocks are protected from being over-programmed.
So i checked the RM about over-program description which showing over-program protection is enabled by sideband signals. But RM don't mention about this and what reasons caused this problem, customer want to unlock flash and erase/program flash again.
These sidebands signal goes from PASS or TDM modules:
Pay attention to device's RM, section
Chapter 68 - Tamper Detection Module (TDM)
Chapter 67- Password and Device Security Module (PASS)
