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July 23, 2026
Question

No Debug information available on SBSFU STM32U585 of a TFM projet

  • July 23, 2026
  • 0 replies
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 Hello,

We use MB1551 TFM example project on our industrial board. 

For technical reason, we have modified the card entry point from USART1 to USART3.

(TFM\TFM_SBSFU_Boot\Src\low_level_com.c, “COM_INSTANCE”)

(TFM\TFM_Appli\Secure\Src\low_level_com.c, “COM_INSTANCE”)

The log of SBSFU doesn’t appear on UART target.

So next, we are trying to debug TFM SBSFU of a STM32U585 project as shown in this tutorial : 

We use the SBSFU script “regression.sh” and flash SBSFU, loader, secure and unsecure application with “TFM_UPDATE.sh”.

The JTAG connection works correctly to open CubeProgrammer and read option byte for example.

Finally, we set the tutorial debug configuration and launch the debug without error. Debug launch but stop with this message :

After, we can only stop the simulation or terminate it. 

 

We have couple of questions.

First of all, can we come to the conclusion that our MCU is booting ?

Secondly, Is it possible to change USART1 to USART3 as we did ?

Why do we have break point before the debug simulation launch ? 

 

King regards,

Thanks for your attention,