STM32CubeIDE, STM32U5 : unable to launch the debugger (gdbserver)

[MFred.2]

Impossible to launch the debugger with the following configuration:

• STM32CubeIde1.7.0
• Target Nucleo-U575ZI-Q
• ST-link :

1. Version: V3J8M3
2. Build:  Apr 9 2021 20:49:40

See log files

STm32cubeProg 2.8.1 can connect to the board successfully.

What is wrong ?

BUG ?

[Javier1]

maybe you didnt closed the STM32CubeProg session so the gdb server is busy? it happens to me sometimes

[MFred.2]

I admit that I have also made this mistake more than once, but not in this case.

thanks

[LaurentL]

Hello,

Can you try to decrease the STLink SWD frequency.

If not better, can you try with OpenOcd gdb server.

Rgds,

Laurent

[mattias norlander]

@MFred.2​ , did you solve the issue with Laurent's advice?

[MFred.2]

Hi,

Indeed, decreasing the frequency of the St-link seems to improve the connection, but it is not very stable.

The frequency of successful connection varies between 8Mhz and 21Mhz !

I have not encountered this problem on other Nucleo board references.

Regards

Frederic

[mattias norlander · Accepted solution]

Stay below the 8MHz as specified in the errata: https://wiki.st.com/stm32mcu/wiki/STM32CubeIDE:STM32CubeIDE_errata_1.7.0#STM32U5

The lower the better stability.

[MFred.2]

thank you for this information,

This problem is therefore already known

I didn't think about reading this errata sheet, sorry

[Amel NASRI]

Thanks @mattias norlander​  for sharing this STM32CubeIDE errata reference. It is helpful to make our community aware about it.