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Solution: loop in dbg_task_notify in os_sys_init

I'm starting this thread to answer the question opened here:

http://www.keil.com/forum/13796/
http://www.keil.com/forum/17900/

To solve the problem of the endless loop in the dbg_task_notify() in the os_sys_init() use configuration file C:\Keil\ARM\Startup\ST\STM32DBG.ini
Add it in "Target Options" - "Debug" - "Initialization file", edit it and set a tick on 'TRACE_IOEN' on "Configuration Wizard" tab.

Do not forget to enable ITM in "Target Options" - "Debug" - "Settings" - "Trace" - "ITM Stimulus Ports" - "0" too.