STM32L552ZE has set boot_ Lock and TZNE, and set RDP LEVEL=1, causing a deadlock. How to unlock
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‎2023-03-30 4:33 AM
Currently, my program cannot be executed, and it is useless to pull up the boot pin, and STLink cannot be linked. There is a way to reset the chip register boot_lock, TZNE, and RDP? or how to perform full chip erasure?
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STM32L5 Series
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‎2023-03-30 6:21 AM
Hi @星宇 周​
If i understand well , your sample is lock because your trust zone is Enable and your RDP is in level 1 and you would like to return to the basic configuration of your sample?
If it is the case, please refer to this wiki article : https://wiki.st.com/stm32mcu/wiki/Security:How_to_disable_TrustZone_in_STM32L5xx_devices_during_development_phase.
Regards
DianeP
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‎2023-03-30 6:21 AM
Hi @星宇 周​
If i understand well , your sample is lock because your trust zone is Enable and your RDP is in level 1 and you would like to return to the basic configuration of your sample?
If it is the case, please refer to this wiki article : https://wiki.st.com/stm32mcu/wiki/Security:How_to_disable_TrustZone_in_STM32L5xx_devices_during_development_phase.
Regards
DianeP
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‎2023-03-30 7:48 PM
Thank you for your help. But my current problem is that I set boot_lock and RDP to 1, so I can not read the chip, nor can I call the system bootloader .
Can I reset the chip to factory settings or erase it completely? Please help me if you can!
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‎2023-03-30 7:49 PM
Thank you for your help. But my current problem is that I set boot_lock and RDP to 1, so I can not read the chip, nor can I call the system bootloader .
Can I reset the chip to factory settings or erase it completely? Please help me if you can!
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‎2023-03-31 1:23 AM
Hi @星周.1
It willl depend. If your chip have in flash area an secure code that jump in non secure zone, you can do the regression by attaching the JTAG . But if it's not the case, you have definetly lost this chip.
Regards
DianeP
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‎2023-04-02 5:55 PM
OK,Thank you.I think i have lost this chip.
