STM32CubeProgrammer cannot connect to board using ST-LINK V3

[SedCore]

Hi, I get the below error when trying to connect to my B-U585I-IOT02A board in "Hot plug" and "Hardware reset" modes, whatever is the frequency. I get the same error even with BOOT0 High.

I'm using STM32Cube Programmer v2.17.0

Connection is successful only when I keep on pressing the reset button, but there is no option byte set and any attempt to set option bytes fails.

Thanks in advance for your support.

[AScha.3]

But you disabled the st-link, as written ?  ....otherwise its doing nothing on terminal.

[SedCore]

I'm not sure of having done so. As I mentioned earlier, I just ran the regression.sh script from the TF-M application in the STM32U5 v1.4.0 firmware. Below is the log that I got on the terminal when I ran that script, I don't know if this disabled the ST-Link:

regression script started
Regression to RDP 0, enable tz
      -------------------------------------------------------------------
                       STM32CubeProgrammer v2.17.0
      -------------------------------------------------------------------

ST-LINK SN  : 003B00243232510239353236
ST-LINK FW  : V3J15M6
Board       : B-U585I-IOT02A
Voltage     : 3.30V
SWD freq    : 8000 KHz
Connect mode: Hot Plug
Reset mode  : Software reset
Device ID   : 0x482
Revision ID : Rev X
Device name : STM32U575/STM32U585
Flash size  : 2 MBytes (default)
Device type : MCU
Device CPU  : Cortex-M33
BL Version  : 0x0
Debug in Low Power mode enabled


UPLOADING OPTION BYTES DATA ...

  Bank          : 0x00
  Address       : 0x40022040
  Size          : 36 Bytes

▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ 100%▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ 100%

  Bank          : 0x01
  Address       : 0x40022068
  Size          : 8 Bytes


PROGRAMMING OPTION BYTES AREA ...
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ 50%
  Bank          : 0x01
  Address       : 0x40022068
  Size          : 8 Bytes


  Bank          : 0x00
  Address       : 0x40022040
  Size          : 36 Bytes


Reconnecting...
Error: failed to reconnect after reset !
Error: Unable to reconnect after setting the Option Bytes

I lost access to the board after running this.

[AScha.3]

1. last successful action was : programming the option bytes. (probably wrong...RDP set to 1. )

2. disable the st-link, is needed to connect to terminal. YOU have to do it, -> read in um2851 ...complex game.

[SedCore]

Hello @AScha.3 

I also tried to do that step of disabling ST-Link, but without success. In fact, to disable ST-Link, "some information is displayed in the terminal emulator" as mentioned. There must be something on the terminal screen (I did a previous project using TF-M, so I know about this). But in my case now, nothing even appears on the terminal screen...

[AScha.3]

Hi,

so maybe you try to get some help from STM:

https://ols.st.com/s/

stm support