PS2 Linux support was a massive joke -- they forced linux development to be perfectly orthogonal to the rest of the system, and I don't think anything that separates the PS2 from the typical desktop made it into open source (i.e., GPU drivers, and so on).
PS3 Linux support was retroactively revoked via firmwear update mere months after launch.
PS3 Linux support was retroactively revoked via firmwear update mere months after launch.