STM32H563: Unable to detect DBGMCU Mailbox ST

[gh_rcl]

Hi,

On a custom board I get the following message: Unable to detect DBGMCU Mailbox ST

when i run regression.bat.

I did several test (provisionning, regression) before and i didn't notice any issues

DA with password and TZ disabled

A program is running on my custom board but i cannot come back to OPEN state with the regression script.

I tried with HRST wired to my STLINK with no success ...

Any ideas ?

Regards

[Jocelyn RICARD]

Hello @gh_rcl ,

So I understand the regression script was working before while you were in provisioning state.

Do you know in which state you changed the device ?

If you have set it to LOCKED then this behaviour is normal.

Best regards

Jocelyn

[gh_rcl]

Thanks for your feedback.

I set the state to "CLOSED"

Do you know if i can reflash a new firmware from the internal bootloader via an UART even if the STM32H563 is CLOSED or LOCKED ? 

Regards,

[Jocelyn RICARD]

Hello @gh_rcl ,

when device is closed you will boot to flash unconditionally.

There is a possibility to jump to bootloader from application but only when you have enabled TrustZone. But this is not recommended.

Your embedded firmware can trigger a regression by changing product_state if it is running in HDP Level 1.

Now, in your case I would double check the reset connection, checking that reset is well propagated to the chip when Debug Authentication is launched.

Best regards

Jocelyn