Re: Prefered method to map PCI memory into userspace.

[David S. Miller]

On 27 Sep 2003 00:03:42 +0200
Andi Kleen <ak@xxxxxxx> wrote:

> mmap on /dev/mem
> 
> PIO cannot be done on memory, for that you have to use iopl() 
> or ioperm() to get access to the port and then issue the PIO 
> instructions yourself

Platform dependant, mmap on /dev/mem doesn't work on many systems.
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