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From: "Achim Machura" <achim.machura@berghof.com>
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Date: Thu, 1 Dec 2005 09:00:41 +0100
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Subject: AW: RE: linuxppc-embedded help needed:kernel access of bad area
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Hello,

> #define BCSRADDR 0x04500000
> 
...
> static int PQ2FADS_GPL_open(struct inode *inode,struct file *filp)
> {
> 	PQ2FADS_GPL_CSR=(PQ2FADS_BCSR*)BCSRADDR;

possible you have to change physical address to logical see ioremap.

achim