Hi Nikolaus!
EvilDragon has told that there is 4 GB RAM prototype around, but it has special issue: "... it needs to have the RAM timings, etc. setup in bootup and kernel, otherwise, the kernel simply crashes."
I don't recall anything about it in maillists or in introductions from you. Could you please give some specific hints about actual state and what should be done? What can be done, with and without the prototype on hands?