STM32L151CB-A not booting from internal FLASH with RDP = BB (Level 0)

[LKamm.2]

Dear all,

I have a question regarding the read-out-protection on STM32 L1 series (STM32L151CB-A) and I was wondering, if the same problem occurred to anyone of you before.

I am booting from internal flash memory (BOOT0 = GND) and set the option bytes RDP to BB (Read out protection level 0) using the Cube Programmer.

However, after doing so, the controller is not booting anymore. Even after a hardware reset pulling the NRST line low.

My program is also writing to the FLASH and EEPROM - could this be an issue?

(HAL EEPROM / FLASH unlock).

What could be the origin of the problem?

Thank you and all the best!

[Tesla DeLorean]

So code is probably running.

Make sure to instrument your code to see where and how far execution gets.

Perhaps do something in Reset_Handler to set or toggle a GPIO

Add output to HardFault_Handler and ErrorHandler so you can see if things get stuck there.

Watch for other while() loops where it might get stuck or hung up.

[FBL]

Hello @LKamm.2​,

RDP = BB refers to RDP level1 not 0. You may need to set RDP level to AA to disable the read protection.

Hope this helps!