YDL 6.1 NO DVD INSTALL
as a linux noob i was able to figure it out on my own, and here is how!
1 gb usb works for sure.
usb keyboard required
pdaxrom bootloader for ps3 find it here
http://wiki.pdaxrom.org/downloads/PS3/bootloader/
copy to /PS3/otheros on usb stick and install on ps3 (enough threads explaining how to do this)
on your pc, extract YDL6.1.iso or whatever your install is named and copy all files/folders except PS3 and YellowDog to your usb
(you dont need them all im sure, but i did anyways)
put usb back in ps3 and boot other os
pdaxrom bootloader should recognize the usb stick
and using the arrow keys you should be able to find your install, mine was install_ps3_1080p
select language and keyboard
now here is where it got fun for me, but it wasn't too difficult. with a deadblu-ray i couldn't install from dvd or hd and usb was to small so through trial and error i found an http mirror that had all the files, and none that were corrupt.
http://gulus.usherbrooke.ca/pub/distro/yellowdog/releases/yellowdog6.1/os
it should find stage2.img and start to download and begin the installer. to keep it fast and simple i installed no extras to begin with.
it can be done! for the last year i have consistantly read that it cant. if anyone wishes to simplify the process please feel free.