BSP and Device Driver Development Guide
The bsp_cleanup() is the last C code invoked. Most of the BSPs
use the same shared version of bsp_cleanup() that does nothing.
This implementation is located in the following file:
c/src/lib/libbsp/shared/bspclean.c
The bsp_cleanup() routine can be used to return to a ROM monitor,
insure that interrupt sources are disabled, etc.. This routine is the
last place to insure a clean shutdown of the hardware.
BSP and Device Driver Development Guide
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