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Why debug still works with Truestudio even when Cubemx generated code with SWO disabled ?

Question asked by Jason Dough on Mar 24, 2018
Latest reply on Mar 24, 2018 by Clive One

I used to use Cubemx to generate peripheral code not realizing that it got SYS > Debug → Disabled the whole time. According to sources on the internet this means, no JTAG, no SWO as those pins were not initialized. Yet, I use Truestudio IDE and was able to debug all along. Could you please share some info on how this mechanism worked ?

I looked into project startup scripts, startup.s and there didn't seem to have any special instructions that could enabled SWO debug.