Joel Sherrill commented: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5417#note_139575


There are at least two kinds of out of memory issues. The first is when the 
test itself does not fit into the board's memory. This is detected at link time 
and _ld_ is inconsistent in how it reports this. The second is tests which 
create/allocate something large or a large number. Some of the _fstests_ 
_malloc()_ memory for a 1MB RAM disk and that results in a run-time allocation 
failure. 

Making this more complex is that the code size on a Thumb vs 32-bit vs 64-bit 
architecture is very different. Some BSPs also have a larger minimum footprint 
-- the VMEbus BSPs and amd64 tend to have larger minimum footprints. But those 
also tend to have enough memory to not have sizing issues.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5417#note_139575
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