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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] [BUG?] Duplicate PCI setup?
Date: Sun, 24 Sep 2006 20:09:48 +0100
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To: qemu-devel@nongnu.org

On Sunday 24 September 2006 19:52, Stefan Weil wrote:
> When I start QEMU for i386 with an emulated PCI network card,
> this card's PCI memory space is setup twice:
> once by QEMU, a second time from BIOS.
>
> PCI I/O regions both times get the same address:
> ne2000_map: region=3D0, addr=3D0x0000c100, size=3D0x00000100, type=3D1
> ne2000_map: region=3D0, addr=3D0x0000c100, size=3D0x00000100, type=3D1
>
> PCI memory regions get two different addresses.

So? Why is this a problem?
PCI is designed to allow dynamic resource (re-)configuration.

> Maybe the setup by QEMU was needed with an earlier PC BIOS
> and is no longer needed today?

=46rom hw/piix_pci.c

/*
 * This function initializes the PCI devices as a normal PCI BIOS
 * would do. It is provided just in case the BIOS has no support for
 * PCI.
 */

Paul