From mboxrd@z Thu Jan  1 00:00:00 1970
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: gopi krishna <mgopik@yahoo.com>,
	<linuxppc-dev@lists.linuxppc.org>
Subject: Re: Unable to read/write consistently to a device.
Date: Tue, 27 Feb 2001 20:27:29 +0100
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>  We have a device 0xf0040000.  This address has been
>ioremapped.
>(Hence directly using the physical address to access
>the memory)

What do you mean by ioremapped ? You should use the virtual address
returned by ioremap (which is usually _not_ the same as the physical
address, except in some specific cases), not the physical address, to
access the registers.

Ben.

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