[OpenBIOS] Graphical console for TCX/Sparc32

[Blue Swirl]

I implemeted a graphical console including a Sun keyboard, please have a 
look at the screenshot.

Other changes include: baud rate programming (no effect in Qemu), made some 
tables readonly, and the older patches for HD boot  & workaround to stack 
corruption.

Linux hangs if the graphical console is enabled, maybe the romvec mapping 
tables need to include the framebuffer.

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