Well, I think I had undertood your question: more than 1GB RAM in the autodetection.

The autodetection in Knoppix is made by miniroot.gz file, which is inside the boot.img. When you mount the boot image , you can:
Code:
gzip -d miniroot.gz
then mount miniroot file:
Code:
 mount -t msdos -o loop miniroot /mountpoint
. Look inside. There is a file called 'linuxvrc' that has ALL the autodetection code. At the beginning of the script someone thought that 1GB would be enough RAM memory to search. you can change the variable here as you want. (the code is quite good commented).
I dont know much about kernels, but I'm totally sure that if you don't touch this you will never make your RAM work.

(Sorry for my english, i hope you understand me)

SANTA
(Guadalajara, Spain)