Hello World fatal error (but no problem)

[Smith, Gene]

I don't know if this might be documented somewhere, but I couldn't find 
it. When ppc4xx bsp programs finish by calling bsp_cleanup() after main 
returns an intentional fatal error is flagged in the call. Other cpu 
types may do the same thing or just trap. At first I thought something 
was wrong and was a bit disconcerted. Hopefully this might be helpful to 
others bringing up a new board in rtems.

-gene