There's just no stopping Graf. He's managed to install Gentoo on the internall HDD of the PS3 Slim. Speaking at his blog, he notes he managed to do it in a way that doesn't affect GameOS. More details below.

Here's the post from his blog

Great news, guys I was very busy in the last days and i managed to install Gentoo on the internal HDD of PS3 Slim
I created a new VFLASH region of size 40GB and installing my Linux kernel there right now And GameOS doesn’t touch this region when i boot it So you can reformat your HDD (but not VFLASH) and Linux will be still there I resized VFLASH from 256MB to about 40GB

Next steps:
* Compiling petitboot for PS3
* Installing petitboot on VFLASH
* Creating HV CFW which is capable of booting GameOS or petitboot. petitboot can boot Linux (or other OS) from HDD, FLASH, USB, CDROM or NFS (just like 3.15 did it or me on my PS3 3.41)
* Creating a more user-friendly approach for installing Linux on internal HDD
BTW, check out my new ps3stor-utils and Linux device driver ps3stormgr. It allows you to create/delete storage regions on PS3 Linux I used it to create a new VFLASH region for Linux.
Here are my Linux partitions on VFLASH:
brw-rw—- 1 root disk 253, 112 Mar 25 19:19 /dev/ps3vflashh
brw-rw—- 1 root disk 253, 113 Mar 25 19:19 /dev/ps3vflashh1
brw-rw—- 1 root disk 253, 114 Mar 25 19:21 /dev/ps3vflashh2
brw-rw—- 1 root disk 253, 115 Mar 25 19:23 /dev/ps3vflashh3
OtherOS++ will be back and even better than my 3.41 version
HV rules !!!

http://www.maxconsole.net/content.php?45289-Hacker-gets-Gentoo-Linux-running-on-PS3-Slim-HDD

Posted: Mar 26, 2011 7:33 pm