zImage.initrd

[ppc-dev at storix.com]

I am attempting to understand the makefile for creating a zImage.initrd. 
Essentially I know it creates several 32-bit .o files, links them together 
and runs addnote. I am particuarly interested (baffled) by kernel-vmlinux.o

How do I get from a 64-bit vmlinux to 32-bit kernel-vmlinux.o? Also, I notice 
that kernel-vmlinux.c is empty. Is this just a dummy placeholder? Any 
information or insight as to how this works would be greatly appreciated.

Thanks
David Huffman
Storix, Inc.