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Date: Fri, 24 Oct 2003 00:57:50 -0700
From: "David S. Miller" <davem@redhat.com>
To: "Randall Hyde" <randyhyde@earthlink.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: mmap to Access PCI space?
Message-Id: <20031024005750.114ab4fb.davem@redhat.com>
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On Thu, 23 Oct 2003 20:36:12 -0700
"Randall Hyde" <randyhyde@earthlink.net> wrote:

> I need to access a couple of SATA chips from a user-mode
> program (yep, running as root). I know for a fact that my
> chip resides at address 0xfc300000 (/proc/iomem and /proc/ide/siimage
> tells me this).  Can I do a mmap like the following to access the registers
> on ths chip?
> 
> fdDevMem = open( "/dev/mem", O_RDWR );
> ptr =
>     mmap
>     (
>         NULL,
>         4096,
>         PROT_READ | PROT_WRITE,
>         MAP_SHARED,
>         fdDevMem,
>         0xfc300000
>     );

That's not portable and will only work on a few platforms.
Please use mmap() and ioctl() operations on /proc/bus/pci/*
nodes to accomplish your task.