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Date: Fri, 26 Sep 2003 21:01:27 -0700
From: "David S. Miller" <davem@redhat.com>
To: Andi Kleen <ak@suse.de>
Cc: jdeas@jadsystems.com, linux-kernel@vger.kernel.org
Subject: Re: Prefered method to map PCI memory into userspace.
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On 27 Sep 2003 00:03:42 +0200
Andi Kleen <ak@suse.de> 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.