autoyast on IBM PPC

Hi Guys, I'm having problems installing suse 10 on on an LPAR on IBM pseries. I boot using bootp pointing to "inst64", and I'm doing an nfs install. Everything works if I do this manually but I'd like to be able to use bootp and install using autoyast. I don't know how to pass autoyast parameter, I've tried to add it to yaboot.conf but didn't work. I'm not very familiar with suse... Any suggestions? Thanks a lot, Gabriel