From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff Garzik <jeff@garzik.org>
Subject: Re: Two I/O memory regions in /proc/iomem for a NIC
Date: Sun, 2 Jul 2006 07:12:24 -0400
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To: John Que <qwejohn@gmail.com>
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On Sun, Jul 02, 2006 at 10:24:10AM +0300, John Que wrote:
> Hello,
> 
> I had noticed that there are machines where
> if I ran cat /proc/iomem I see one I/O memory region for the NIC
> I am using; while there are other machines where
> I see 2 regions for the NIC I/O memory.
> 
> For example, on a machine with e1000 NIC adapter,
> I see the following 2 I/O memory regions for the NIC:
> fc9a0000-fc9bffff : 0000:03:04.0
>    fc9a0000-fc9bffff : e1000
> fc9c0000-fc9dffff : 0000:03:03.0
>    fc9c0000-fc9dffff : e1000

There could be 1001 reasons.  Overall, it's not important :)

e1000 driver will reserve all regions made available by the PCI device.

	Jeff