Unable to execute my own application without TrustZone on STM32U5 (B-U585I-IOT02A) after executing SBSFU application example

[Domenico]

Hi,

I ran the SBSFU example of STM32CubeU5 following what is in the readme file without any problem. Then I disabled TrustZone but I cannot run the projects made with STM32CubeIDE, verification of the downloaded firmware fails. If I try to erase the flash memory (full chip erase) with STM32CubeProgrammer I get an error message. The error message indicates to check the flash memory protection but I have not set some flash memory protection.

Thanks

[Mohamed Aymen HZAMI]

Hello @Domenico​ and welcome to the community,

Can you please share a snapshot with the error message?

Mohamed Aymen

[Domenico · Accepted solution]

Hi @Mohamed Aymen HZAMI​,

I solved the problem by running the regression.bat commands that disable memory protection and erase the memory completely.

Thanks

[CMYL]

Hi Domenico,

SBSFU requires TrustZone to be enabled in order to boot in a secure zone (root of trust).

The settings is described in Readme of SBSFU project, section 2. Initialize the device

• Please ensure with STM32CubeProgammer the following Option bytes configuration for the device:
  • RDP = 0xAA (RDP Level 0)
  • DBANK = 1 (Dual bank mode enabled)
  • SWAP_BANK = 0 (Bank1 and Bank2 are not swapped)
  • nSWBOOT0 = 1 (BOOT0 taken from BOOT0 pin)
  • TZEN = 1 (TrustZone security enabled)
  • NSBOOTADD0 = 0x100000 (User flash address 0x08000000)
  • NSBOOTADD1 = 0x17F200 (System bootloader address 0x0BF90000)
  • SECBOOTADD0 = 0x180080 (boot entry point address 0xc004000)
  • SRAM2_RST = 0 (SRAM2 erased at each reset)

BR,

Younes

[mr.1]

Hi @Domenico​ ,

I have flashed the SBSFU application with by mistake write protection enabled for flash address 0x08000000. I am unable to erase using jlink commander.exe as well as by IAR->project->Download->erase. Please suggest me how to erase the flash of STM32H743II.

[mr.1]

@Domenico​ This is the error i am getting from the IAR IDE.