To launch multi-core debugging with J-Link:

  1. Open two instances of IAR Embedded Workbench.

  2. Select the CM33 project in the first IDE instance and click Project > Debug without Downloading. The debugger will reset the target, and halt at the beginning of the CM33 project's main().

  3. Select the the CM55 project in the second instance and select: Project > Attach to Running Target.

  4. After performing the attach, run the CM55 core before continuing with the debugging of the CM33 project.