ppc 405 (xilinx) physical RAM not at 0

[rvk]

Wise folks, I apologize if this is a dupe, if so please send a link either in
forum or external to educate me.

I have a port coming up to a ppc 405 Xilinx board. The port-from board has
RAM at 0x0000_0000, but the new board will not have that. I have read Dave
Lynch's external article here: (http://www.linuxjournal.com/article/9362),
there is a paragraph where he describes asking forums for help and being
told NO! NO! don't do that..., I don't have a choice. The
include/asm-powerpc/ppc_asm.h header includes the tophys() and tovirt()
macros used in arch/ppc/kernel/head_4xx.S to set up the initial mapping of
KERNELBASE, and they seem hardcoded to a phys address for RAM of 0 (tophys
in the final BOOKE/else case converts by subtracting KERNELBASE from itself
basically, giving a base phys of 0).  I'm worried this is the tip of the
iceberg.

Can anyone point me to patches or advice on how to get the 405 source using
a different phys RAM base? 
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