Figure 90. Error Message For Multiple St-Link Detected In Stm32Cubeide - STMicroelectronics STM32 Application Note

AN4989 Managing various targets on the same PC

Figure 90. Error message for multiple ST-LINK detected in STM32CubeIDE

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Setting up with OpenOCD
rIt is possible to force the connection to a specific target using the ST-LINK S/N.
In Run -> Debug Configurations -> Debugger Pane, add the following OpenOCD option:
-c hla_serial [ST-LINK S/N]
Figure below illustrates the setting of an OpenOCD option for forcing a connection.
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