Install on a Power5 (p5 550)

Hello all!

I'm new to this world: PowerPC, RISC, 64 bits.
So, it's a newbie doubt...

I'm following this manual
http://www.gentoo.org/doc/en/ha
ndbook/2006.0/handbook-ppc64.xml?full=1#book_part1
My question it's about the yaboot and the partitions type.
/dev/sda1: PReP (8MB)
/dev/sda2: swap (1GB)
/dev/sda3: / (30GB)

Questions:
1) What is an PReP partition?
2) How should be my /etc/yaboot.conf like?
Mine was like "Code Listing 6: yaboot.conf for PReP
hardware"
default = linux
timeout = 100
image=/boot/kernel-2.6.12-gentoo-r10
      label=linux
      read-only
      root = /dev/sda1
      append="root=/dev/sda1"
Is it correct?
Guess not, beacuse after it boots up, crashe and restart.
What am I doing wrong?

If you need more information, please ask. I don't know what
to say more 

Thanks,
Rodrigo.
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