# Debugging with OpenOCD

Make sure the following line is present in the .cfg file for your target:

```
 gdb_port 3333
```

Edit the port number if necessary. Specify that port in the process options and use the Debugger, Attach command.

Tips: Use the [GDB command line](/9.1/user-guide/user-interface/command-line.md) to send commands directly to OpenOCD interpreter.


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