[LinuxBIOS] RAM detection for Intel 430FX and memory sizing

[popkonserve]

>>the routine does the following:
>>[...]
> Please add this documentation to the source code as a (Doygen) comment.

i don't think that this belongs into the source code. i would rather put 
it into a separate document that describes the general sizing algorithm. 
or even in a document that describes the code used for the 430FX.

here is an article on memory sizing:
http://www.rcollins.org/articles/memsize/MemSizing.html
(please note: the MA table is different for almost every chipset :(
and please ignore the bank switching stuff..)

i did fix some more errors in the code btw. and beautified it to fit the 
coding rules. i'll post a diff or a complete version (depends on the 
number of changes) soon.
Holger