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STM32F429ZIT6 Reset values for Flash Option Bytes when power cycle

Question asked by ifik ifik on Jun 1, 2018

Hi all,


The following problem is appearing changing sectors write protection and power disappearing in the middle of a HAL_FLASH_OB_Launch operation. After the next power up, flash options are reset with RDP = 1 and all sectors are read / write protected with SPRMOD enabled (PCROP protected sectors).   So the mcu is totally inoperative, the cpu is not able to load the interrupt vector through flash D-Bus.

The starting situation is:

If power cycle the board repeatedly, chaining sector write protection operations, these are the flash options after some resets:

Anyone can confirm that this behavior is correct? Is there any way to mitigate this problem?