Cross Compiling Debian PowerPC kernels on x86-64
Embedded Debian repo, install toolchain
echo "deb http://www.emdebian.org/debian/ stable main" >> /etc/apt/sources.list
apt-get install gcc-4.1-powerpc-linux-gnu
This uses EmDebian's stable repo (for Etch)
export ARCH=powerpc
export CROSS_COMPILE=powerpc-linux-gnu-
export CONCURRENCY_LEVEL=4
fakeroot make-kpkg --initrd --arch $ARCH --cross_compile $CROSS_COMPILE kernel_image kernel_headers