Using yum to install a new kernel on Oldworld/BootX machines?

[Rick Thomas]

Ok,  "yum check-update" tells me that there's a new kernel (and a 
bunch of other stuff) out there on the repository that I should be 
installing.

I'm running a beige G3 which is OldWorld, so I'm using BootX.

In that environment, if I just do "yum update" and answer the 
questions, I won't get the new kernel the next time I boot -- will 
I?  This is because yum can't update the Linux kernel in the MacOS 
partition, right?

So... (1) what *is* the proper incantation to make the new kernel 
available so it will be picked up on the next boot?  (2) Do I also 
have to do something with an initial ram disk?  I don't remember 
having to fiddle with initrd when I originally set up this box, so 
I assume the answer to (2) is no, unless something has changed with 
this new kernel.  But I've learned that to assume is dangerous.  So 
I ask for expert advice.

Thanks!

Rick