More walnut boottime "fun"

	Hi,

	Apart from NFS not working, it looks like the bootloader is
clobbering itself when the image is reasonably large (> 1M?).

	This happens when it relocates itself (the initrd or whatever
overwrites the relocation code).

	Has anyone fixed this, or should I keep going ;)

	Simon

p.s. this is only an issue where the dest address < the load address, as
on walnut and friends

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