Not able to read 0x0C000000 location of STM32U575ZIT via STM32Cube Programmer.

[vijay_03]

Hi,

I am using MB1549C devkit for STM32U5. I have enabled trust zone and created one application.

Now I wanted to update firmware via native bootloader over UART.

I have tried to connect it over UART2, I got read error over 0x0C00 0000 where secure firmware is loaded. even I am not able to erase firmware. I am able to read data from 0x0810 0000.

Here my secure and non secure code .ld file mapping.

 

Can you please guide me, How can I update firmware of mcu which has trustzone enabled via native bootloader using uart?

Please check option byte of needed. I have attached image.

 

[Pierre_Paris · Accepted solution]

Hello @vijay_03​ ,

You said : "I got read error over 0x0C00 0000 where secure firmware is loaded. even I am not able to erase firmware."

• In fact, you must want to access this secure address from a non secure zone. What is your RDP level ?

To answer your question : "How can I update firmware of mcu which has trustzone enabled via native bootloader using uart?"

• The best solution is to use X-CUBE-SBSFU (Secure Boot and Secure Firmware Update). That expansion package allows to update the STM32 microcontroller built-in program with new firmware versions. The update process is performed in a secure way to prevent unauthorized updates and access to confidential on-device data. You can find more information about X-CUBE-SBSFU here.
• If the Trustzone isn't necessary in your application, you can also disable it.

Regards