Two white screens? You've got the file structure setup correctly as far as I can tell, but somehow the dslinux.nds file is not booting correctly. Have you tried launching it through Moonshell or HBMenu rather than the AK2i launcher? I know the slot-1 Supercards had trouble launching DSLinux, but don't know if it's the same way on the AK2i.
Just tried that, didn't work...
Wait... !@#$, I don't remember if the new 3in1s are supported by DSLinux or not, because they changed their RAM access somehow. I'd suggest trying the plain WMB "dslinux.nds" version first to see if it's a problem launching DSLinux itself or if it's a problem with your slot-2 RAM.
Tried that, same white screen problems
Always fun trying to get old homebrew programs to run on new homebrew hardware, right?
Sure is ^^ So much for being a linux enthusiast