Which irq files are taken and what is *_mng_*

[leonp at plris.com (Leon Pollak)]

Hello, gurus.

	1. Looking for something different, I found that the 
.../src/lib/libbsp/powerpc/shared/irq
and, for example,
.../src/lib/libbsp/powerpc/mbx8xx/irq
both contain the same named files irq.c, irq.h, irq_init.c with different 
realization of the same named function. 
Please, how the link process regulates which set will be taken?

	2. I search in the documentation and was not able to find how and when the 
functions like BSP_rtems_irq_mng_XXXX are used. Can you point me to any 
explanation of the principles of this management and its usage?

Many thanks ahead.

-- 
leonp at plris dot com