[OpenBIOS] Sparc update

[Blue Swirl]

I found the annoying bug that sometimes prevented any disk access. This was 
because the IOMMU page table alignment restriction (32k) was satisfied in 
virtual memory level, but not physical. Depending on the compilation 
options, phase of moon etc. ESP memory access didn't work. Now I tried 
several compilers, switches and debug options and every version produced 
works.

The rest of the patch fixes some warnings (GCC 4.1) and changes over to 
switch_context method at boot. Some newly enabled filesystem code needed 
more bits from libgcc.

No progress with Linux.

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