[OpenBIOS] FCode on an embedded Leon-Sparc system

[Blue Swirl]

>we were at ~12kb machine code for the C side of the forth system at
>one point. and after that, I think only drivers were added.

I did a quick test and disabled the drivers and filesystems, now we are at 
72K:
obj-sparc32/openbios-plain.elf:     file format elf32-sparc

Sections:
Idx Name          Size      VMA       LMA       File off  Algn
  0 .text         0000f578  ffd00000  ffd00000  00004000  2**14
                  CONTENTS, ALLOC, LOAD, CODE
  1 .rodata       0000179c  ffd10000  ffd10000  00014000  2**3
                  CONTENTS, ALLOC, LOAD, READONLY, DATA
  2 .data         000000b0  ffd12000  ffd12000  00016000  2**2
                  CONTENTS, ALLOC, LOAD, DATA
  3 .bss          0006b000  ffd13000  ffd13000  00017000  2**3
                  ALLOC

Text and rodata can be merged and data segment can be set up manually. The 
interrupt vector table has alignment restriction of 16K which adds a lot of 
NOPs now, but most of that can be saved. So I think we are pretty close to 
64K.

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