Generating elf kernel ?

[Guillaume Dargaud]

Hello all,
In the past I've been using the PPC architecture to generate elf kernels (I 
wrote my own bootloader):
$ file zImage.elf 
zImage.elf: ELF 32-bit MSB executable, PowerPC or cisco 4500, version 1 
(SYSV), statically linked, not stripped

I'm now trying to change to the PowerPC architecture, but the generated kernel 
is different and won't load:
$ file zImage
zImage: u-boot/PPCBoot image

How do I generate an elf file ?
For what it's worth, I use the Xilinx-patched kernel and I load it to a flash 
mem using impact.
-- 
Guillaume Dargaud
http://www.gdargaud.net/