there is only 2 ways you can play ps2 games on a ps3 that i know of and that im sure are the only ways right now.
1. Do the Swap Magic trick
2. Be one of the lucky people who have the 40/60 gig models that have the built in ps2 hardware or the 80 gig PS3s that has the emulator built in by sony. (these models were the first PS3's to come out)
Linux could run possibly run ps2 emulator but i doubt it would be able to access the cell processor of the PS3
Im new here, and not a moderator or anything, but please dont put false statements like that. Unless you can actually prove it to us via a video and the files.