The problem about MMU in MPC860

Hi:

This is really a boring problem, however, give me some
help please.
I am debugging the linux on my customized 860 board.
The linux can't bootup, the message is:

Linux/PPC load:
Uncompressing Linux...done.
Now booting the kernel
loaded at:     00200000 0020B1D4
zimage at:     00230164 0028534F
avail ram:     00286000 00FFFFFF

I think that's the MMU's problem.
How to resolve it?
Any suggestion is welcome.

Thanks!

LiuTao

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