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From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] Boot order problem and disable iPXE/gPXE
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To: Gerhard Wiesinger <lists@wiesinger.com>
Cc: qemu-devel@nongnu.org

On 01/05/12 10:24, Gerhard Wiesinger wrote:
> On Thu, 5 Jan 2012, Gerd Hoffmann wrote:
>>  Hi,
>>
>>>> Better use a empty string as romfile argument, that will make the ROM
>>>> pci bar go away instead of creating one with an invalid rom.
>>>
>>> Thnx. Works well by specifying no romfile, that's the trick. I had the
>>> problem than otherwise devices were created. But I'm still getting the
>>> following iPXE rom message:
>>> iPXE v1.0.0-591-g7aee315
>>> iPXE (http://ipxe.org) 00:03.0 CA00 PCI2.10 PnP PMM+0FFCA670+0FF8A670
>>> CA00
>>>
>>> How to disable it, too?
>>
>> It shouldn't be there.  I guess you've trapped into automagic device
>> creation logic in qemu.  When neither -net nor -netdev is specified on
>> the command line qemu creates a default network setup for you, which
>> includes a nic, and that probably is the rom of the automagically
>> created nic.
>>
>> Try "qemu -netdev user,id=mynet -device rtl8139,romfile=,netdev=mynet",
>> then it should work as expected.
> 
> Old command line (relevant parameters):
> -net nic,model=rtl8139,macaddr=1a:46:0b:ca:bc:7c,vlan=0

creates a nic (with rom).

> -net tap,ifname=tap0,script=no,downscript=no,vlan=0

creates a tap device

> -device rtl8139,romfile=

creates a nic too (without rom), so you have two rtl8139 devices now ...

You probably want this:

-net tap,ifname=tap0,script=no,downscript=no,vlan=0
-device rtl8139,romfile=,macaddr=1a:46:0b:ca:bc:7c,vlan=0

Or when using netdevs instead of vlans:

-netdev tap,ifname=tap0,script=no,downscript=no,id=net0
-device rtl8139,romfile=,macaddr=1a:46:0b:ca:bc:7c,netdev=net0

Likewise for the second nic, just with vlan=1 (or a different name for
the netdev).

HTH,
  Gerd