It really isn't that important (Score 1)

Everyone should know that just because the software is writen on Linux or SGI doesn't mean PS2 will use Linux or SGI as they're OS. Old Nintendo games (I cant say for new ones) were all writen in DOS. As long as your code is cross platform it doesn't matter. Your not going to be able to run linux code on a PS2, its not going to be the same OS. I can write code in Linux, compile it in DOS and it will run, as long as it cross platform. Thats all SONY is going to do here.