Re: Unable to read/write consistently to a device.

 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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