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/dev/mem and /dev/raw

I attempetd to transfer data from a raw char device to a buffer allocated by 
mmaping /dev/mem. But the operation failed with 'Bad Address'.Upon a bit of 
investigation I found that VM_IO flag is set in the mmaped pages.get_user_pages 
() which is called by the raw character driver doesn't like this.I am not very 
clear about the reason. 
Is it not possible to do this? 
-sridhar 
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