Where are the controller drivers?

Hi there.

I'm not sure it's gonna help U, but for what I remember, I
never managed to boot from a gentoo ia64 CD, but it was long
ago now... (about 2 years !)

When I made my install, I had to download and install a
Debian (the only one CD I managed to boot with !), and after
that, install gentoo in a chrooted env...

Maybe you could try having a similar approach if you got
time to spend and enough disk space 

However, good luck with your install