STM32U585 TZEN Program Error when reset command is used

[PJose.4]

Hi @channel

I am using the B-U585-IOT2A board based on STM32U585 and am configuring TZEN and checking some sample programs. i am not able to reset the board either through the push button or through the software code "NVIC_System_Reset()" and when debugging am getting a break error as shown below:

The debgug console is returning the error:

On searching the community i found that there is some error in the memory configuration of the secure and non secure area. the linker script i have used is the default one that stmcube mx has generated. the option byte i have used is as below:

The issue is i can run my program only once(functionality works) but neither am i able to reset or run the program again while debugging again.
please assist me in solving the issue.

Awaiting support in this regard

Thanks and Regards
Philip Jose

[Pierre_Paris]

Hello Philip Jose @PJose.4 ,

Thank you for your question, I have listed some points / questions :

• Are you sure about the start and end address of secure area 2 ?
• What is your boot configuration and your OB values ?
• Can you also please share the linker file ?
• Can you tell me a bit more about your application ? Are you performing illegal access in your application ? (Check the TZIC registers...)

Best Regards, 
Pierre

[PJose.4]

Hello @Pierre_Paris 
Thanks for your update

I am trying one basic TF-M implementation with the following functionality:

1. Secure Peripheral - LED, UART

2. Non Secure Peripheral - LED

3. Secure to Non secure control - Non secure LED control from Secure Code

4. Non Secure to secure (SG ) - Access secure UART from Non secure code

Following is my option byte configuration(boot Configuration)

User Configuration Option Bytes

I am attaching the Linker script for both secure and non secure code.

I have changed the secwm2 option byte value like SECWM2_PSTRT>SECWM2_PEND from information got from the community(Sorry not able to recollect exact reference)
I tested the GPIO_Toggle_TZen code from STM32U5 package with the above configuration.
Please let me know for any other information that is required from my side.
Thanks

[PJose.4]

@Pierre_Paris 
Attaching the secure and non secure code RAM linker script also.

I have checked the GTZC TZIC values as well. The values are 0. the values are disabled.

I have used the reference code from Stm32 firmware package- official release 

en.stm32cubeu5-v1-2-0\STM32Cube_FW_U5_V1.2.0\Projects\B-U585I-IOT02A\Examples\GPIO\GPIO_IOToggle_TrustZone.

The cube MX project also i have just enabled the TZEN bit and not made any changes to the configuration(from the reference code GPIO_IOToggle_TrustZone). Is there any other configuration that i have to do?

Thanks

[Pierre_Paris]

Hello @PJose.4 ,

As the Embedded flash memory (FLASH) chapter of the Reference Manual describe :

• All your configuration seems correct but why did you uncheck SRAM2_RST ? The RAM_NSC is stored in SRAM2. That can be a part of the problem.
• Can you zip me your project please ?
• You are using the example firmware but did the code run correctly ?

Best Regards,

Pierre

[PJose.4 · Accepted solution]

Hi @Pierre_Paris 
Thanks for your update

At last was able to find the solution. The problem was the address configured in the NSBOOTADDRESS0. There was a wrong value given. I modified the values to the following:

Now that issue is solved.(SRAM_RST is checked) that was unchecked while testing the TF-M SBSFU Application.
Now i am able to reset the board and is able to debug multiple times. Now the example code and my code is working fine.

Thanks for your valuable support
Philip Jose