I need to improve this part and give the complete pegasos command line.

if your root partition is /dev/hda3, and you have no separate /boot partition, you have to :

boot ide:2 /boot/vmlinuz-2.4.25-powerpc root=/dev/hda3

If you have a separate /boot partition as /dev/hda4 (for example), you can simply do :

boot ide:3 vmlinuz-2.4.25-powerpc root=/dev/hda3

Friendly,

Sven Luther