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To: "David S. Miller" <davem@redhat.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Prefered method to map PCI memory into userspace.
From: Andi Kleen <ak@muc.de>
Date: Sat, 27 Sep 2003 06:42:16 +0200
In-Reply-To: <Aezg.6hA.9@gated-at.bofh.it> ("David S. Miller"'s message of
 "Sat, 27 Sep 2003 06:10:10 +0200")
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"David S. Miller" <davem@redhat.com> writes:

> 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.

Just curious - what does the X server use on these many systems then ?

-Andi