Some hours ago, I did some research about how I can run Linux on PSP and if is possible.The answer is yes, I can run Linux on PSP.
So, there are many howtos on the WEB that explain how you can do it but isn’t so easy to do it on PSP SLIM, just in PSP FAT.

Then, I prepare a package that contain all files necessaries to run Linux on PSP SLIM, you can do the download at the following link.

http://people.freebsd.org/~araujo/uClinux-PSPSLIM.bz2

Uncompressed this file, copy the uCLinux directory to PSP/GAME150 and going to be happy.