Playstation 2
Early versions of the PlayStation 2 have a buffer overflow bug in the part of the BIOS that handles PS1 game compatibility; hackers figured out how to turn this into a loophole called PS2 Independence Exploit.

Sony also released an official homebrew-development kit that allows Playstation 2 to run Linux

Sony also released an official homebrew-development kit that allows Playstation portable to run Linux

Sony also released an official homebrew-development kit that allows Playstation 3 to run Linux

ok im not telling the truth about the psp but the ps2 has homebrew and the ps3 when it comes out will have homebrew why not the psp?