kernel a/o bootloader confusing yum

[beartooth]

I tried to run yum update this morning. It got almost finished, then
complained that the kernel it had found was for ppc64 -- this is on a G3
iBook, and I don't know what those had in August 2002. 

I tried yum update kernel, and it seemed to take, but reported it found no
bootloader, and couldn't configure the kernel. rpm -q yaboot gets me an
rpm designation.

I tried yum clean, then yum update again. It still hangs on a complaint
that the kernel is for ppc64 architecture. yum update --exclude kernel
fails. yum update exception=kernel fails. 

I see nothing else in man yum that even suggests what to do.

-- 
Beartooth Neo-Redneck, Linux Evangelist
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Remember that I have little idea what I am talking about.