UART driver: read function

[Daniel Krüger]

Beside some problems/differences between newlibc and glibc, one 
RTEMS-specific questions remains unanswered:

What is the right implementation for the UART driver read function 
(console_fns.deviceRead)? It seems to be implemented differently from 
target to target. Some implementations return -1 if the receive FIFO is 
empty and some implementations do a busy waiting for new characters.

Best regards,
   Daniel Krüger

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