More realistic serial init for Sparc32

[Blue Swirl]

Hi,

This patch makes the serial port initialisation more realistic. In addition 
to speed, set also the number of stop bits, size of character, and baud rate 
generator divisor. Also enable RTS and DTR.

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[Stefan Reinauer]

* Blue Swirl  [060909 14:19]:
> Hi,
>
> This patch makes the serial port initialisation more realistic. In addition 
> to speed, set also the number of stop bits, size of character, and baud 
> rate generator divisor. Also enable RTS and DTR.

thanks a lot. committed.