Sparc progress, sort of

[Blue Swirl]

I noticed that when using the preloaded kernel, the kernel has 4 bytes 
memory corruption at address 0xf001000c (physical 0x1000c). The corrupting 
value is 0x7ffffffff, MAXINT. If I restore the original value manually from 
gdb session, Linux boots much better. I haven't yet found where the 
corruption happens.

I made a dirty (don't commit this) version which takes the hardcoded prom 
tree and tree browsing functions from Proll. If OLD_OBP is enabled, the 
version can boot Linux as well as Proll/Qemu can at the moment, meaning that 
we can reach the userland installer without any faults. There could be bugs 
in the Forth-based tree, or maybe calling Forth is not working so well after 
Linux has started doing more things.

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