Kinsey Moore commented on a discussion: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5527#note_147782


There is a comment just above the `#define` that explains why it's 63 instead 
of 62.

Those interrupts being used for software interrupts are defined as interrupts 
from other cores in the datasheet. They can be used by any core to send 
interrupts to any other core, but don't have hard-set usages as they are just 
inter-processor interrupts.

Yes, I had to find the ROM function addresses elsewhere. I did not see them at 
all in the datasheet. There should be a full breakdown in the IDF SDK for each 
chip.

You would define your own chip_definitions file for other chips. 
`c3/chip_definitions.h` should remain unmodified.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5527#note_147782
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