what my
so called friend had made.
I for one always knew it would be a possibility, but I'd not expect some/many games to run properly even using paged memory and some kind of instruction interpreter. Having 32MiB of RAM right on the proper bus will likely always be the best way to go about doing it, even if the end result is playing GBA in DS mode.
One dumb question, that I never bothered to look into... is the GBA bios available in DS mode or would that have to be emulated in some fashion as well?