There already exists a modern Linux kernel port supporting Gentoo to the PS2. https://github.com/frno7/linux The SPC970 MechaCon dumps don't add anything additional, as previous memory card/hard disk drive/disc based exploits will work with the above port.

In addition, PS2 Linux based on Linux 2.2 and PSBBN based on Linux 2.2.19/heavily patched MontaVista/Hard Hat Linux 2.4.17 exist. Additionally unofficial ports for Linux 2.6 and 3.8 also exist: https://gitlab.com/ps2max/linux