Support for powerpc-xilinx-eabi BSP

[Joel Sherrill]

Michael Eager wrote:
> Attached is a patch which configures newlib for the
> Xilinx PowerPC 405/440 BSP, when _XMK__ is defined.
>
>   
If someone doesn't mind, please add RTEMS
to the conditional for PTHREAD_MUTEX_NORMAL,
etc.  It was on my list to add these so the
first step is now done. :)

The others are just alternatives for XMK.

Thanks.

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill@OARcorp.com        On-Line Applications Research
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