[coreboot] HT Doc

[Myles Watson]

> good stuff. I will have to reread several times to understand it ...

Thanks.

Feel free to ask for clarification.  It's always hard to know which things
are easiest to understand.  I'm happy to generate more examples for the
explanation if they would help.

> with the code, we will have to move slowly, as it is tricky, but I
> think you're pointing good directions.

Uh-oh, that's gonna make the Rev 1000 goal tricky.  I was planning on one
big patch since you sent me that goal. :)  

Thanks,
Myles