Lucian Silistru commented on a discussion: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5274#note_136192


Wouldn't NMIE be cleared jumping to RNMI handler in all cases according to spec?
As I read it, you can't get RNMIs with NMIE == 0 but you can get exceptions. 
And with NMIE == 0 those exceptions jump to RNMI handler not mtvec.
NMIE == 0 -> no interrupts, no rnmi, yes exceptions that jump to RNMI handler
NMIE == 1 -> interrupts and exceptions jump to exception handler, rnmi jump to 
RNMI handler

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https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5274#note_136192
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