[OpenBIOS] More realistic serial init for Sparc32

[Stefan Reinauer]

* Blue Swirl <blueswir1 at hotmail.com> [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.


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