VFS: Connot load root device "nfs" or unknown-block(0,255)
Please append a correct "root=" boot option; here are the available partitions:
0b00 1048575 sr0 driver:sr
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,255)
Line 1: It can't find a root drive, and doesn't like "nfs"
Where you have the kernel specified (grub.conf, lilo.conf) it usually says where the root is.
You probably have
kernel some_kernel root=nfs
But it can't find nfs until it's much further along. Catch-22.
Line 2: is telling you to put
kernel some_kernel root=/dev/sdxx or something it can find
Lines 3: Offers the drives it does see. It sees your cdrom - that's all
Line 4: technobabble utterance as kernel commits hari kari