Works on an iBook G4 running Debian 8.
Just dd the linux iso to the device:
dd if=[PATH_TO_ISO] of=/dev/sd[X] (remember to select the whole device !)
boot usb[N_PORT]/disk@1,[BOOTLOADER PATH WITH FUCKING ANTISLASHES]
Examples using USB port 0:
boot usb0/disk@1:,\boot\yaboot #For ttylinux
boot usb0/disk@1:,\install\yaboot #For debian
Just follow the installation procedure.
If you don't want to become surd, you can execute this command:
echo /sys/devices/temperatures/limit_adjust > 10