Hi. For cross compiling: There is a *very* good cross compiler HOWTO on http://bytesex.org. It's for i386->sparc, but based on that it is easy to create a cross compiler for the big iron. (I've already created one, if you want it I can give it to You. I've succesfully cross compiled 31bit kernels with IBM's 2.4.17-whatever-stream patches.) For the debian part: I've never used kernels from debian sources (nothing personal, I just like kernel.org :-)), but is should be the same to cross compile a debian kernel with make-kpkg (as far as i know make-kpkg is some kind of architecture independent script). Hope it'll help.
KK
