Just to say if you don't know...
There was a DS ram expansion pack released by Nintendo that gave you 16MB of RAM instead of 4MB. and it would go into the GBA cartridge slot. It was made only for their internet browser application, however some homebrew uses this extra RAM.
And some 3rd party's even allowed 32MB of RAM. That's how much RAM the Wii has!
I remember hearing the SRB2 DS port ran out of RAM memory, so with the expansions, it'll probably get to the title screen, at least.
However it might lag when playing, so I am thinking maybe to make a special optimized renderer like the 3DS did.