I was wondering if there is a written discription of what files the PSP loads during startup (in order), and what each file of the firmware does (or at least the ones we know...) I tried a couple of searches, but only got results on how to flash/downgrade, and what's different about the firmwares, not the individual files...

Sort of a 'hackers helper'. If I wanted to try to mod something in the firmware, it'd be good to know what files to start with...