Sebastian Huber commented on a discussion on 
cpukit/include/rtems/score/smpimpl.h: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/235#note_112704

 >   */
 >  void _SMP_Synchronize( void );
 >  
 > +/**
 > + * @brief Waits until all other online processors reached the
 > + *   ::PER_CPU_STATE_READY_TO_START_MULTITASKING state.
 > + *
 > + * The waiting is done without a timeout.  If secondary processors cannot 
 > reach
 > + * this state, then it is expected that they indicate this failure with an
 > + * ::SMP_MESSAGE_SHUTDOWN message or reset the system.

All the current BSPs assume that starting a CPU works. This is just an option.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/235#note_112704
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