Actually this URL is also very interesting:
Kernelloader - Browse /Sony Linux Toolkit/Package Update Files/ecare at SourceForge.net
It has bootable memory card with compressed image in it.
Interesting thing what it is used for?
Here is the text from readme:
To create a memorycard with the self-booting ecare-system, simply copy all the files in this folder to a memorycard using PS2Linux.
BE CAREFUL - DON'T DO THIS IF YOU ONLY HAVE ONE MEMORYCARD (FOR BOOTING PS2LINUX)! THIS KERNEL HAS NO HDD SUPPORT.
If you don't have a PAL television-set, you have to edit the file "p2lboot.opt" and modify the line "display=pal" to "display=ntsc" or "display=vesa".
Afterwards connect your PS2 to a network with a DHCP-server, insert the PS2Linux DVD1, insert the memorycard into slot 0 and reboot.
When booting the memorycard, the 1-second timeout allows booting the German version instead of the English version.
You can use a Dualshock2 Gamepad or the Sony PS2-DVD-Remote-control as input device.
When selecting a menuentry, the program might "hang" for a few seconds. This is because it is loading uncompressed data over the Internet. (remember, it is a prototype)
(By the way: "romimage" is not a shell-script - it is a compressed iso-image which gets mounted by the initrdgz.img)
Best Regards from PS3 Linux User