the 8260 MMU problem

[yang.chun2 at zte.com.cn]

I meet some problems about MMU with 8260 cpu.In the function of 
map_page(),the reference f is the flag to set the page present and can be 
read or write. 
but I find if I set the flag zero,the linux will start normal and memory 
can be read and write also ,so why these  happened? The MMU do not worked 
normally!
wish you reply,think you.
 
                            yang.chun
                                       2006.8.23


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