Download Source Package kernel-patch-powerpc-2.4.27:
This package contains the Linux/PowerPC kernel image, the System.map file, and the modules built by the package.
This version contains the kernel images for use with miboot OldWorld PowerMac Machines. It should be used exclusively for debian-installer. You probably don't want this package, but kernel-image-2.4.27-powerpc.
Kernel image packages are generally produced using kernel-package, and it is suggested that you install that package if you wish to create a custom kernel from the sources. You will also need kernel-patch-2.4.27-powerpc