Kevin,
  I started trying to play with this cross compile for the router awhile back and found crosstool. But I got too confused and stopped short of getting even a first run in. I agree that if this can be made to work, that is the best route for me to take. And I would be doing ppc from x64.

Mike

Author: Kevin Brandon
Date: 2014-05-13 17:54 -700
To: Main PLUG discussion list
Subject: Re: Anyone with experience in Cross-Compiling, especially to an embedded powerPC?
Mike,
It's been a long time since I had to build a cross compiler. What a bear
that task is! I fought and researched and learned a lot about it. Still
what ultimately helped me accomplish it was the work that was started by
Dan Kegel on a tool called crosstool.

http://kegel.com/crosstool/

That tool didn't have exactly the support for what I needed at the time but
I found it cleanly designed and easily updatable to accomplish what I was
targeting (Which was ppc from x86).

Building a toolchain takes many hours of compiling and lots of frustrations
when some error during the process... Im not sure if crosstool has been
updated in a long time but it might be worth looking at least as some
instructions in script form.

Good luck!

--
"Creativity is intelligence having fun." — Albert Einstein