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Date: Sat, 7 Jan 2012 23:59:38 +0100 (CET)
From: Gerhard Wiesinger <lists@wiesinger.com>
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Subject: Re: [Qemu-devel] Boot order problem and disable iPXE/gPXE
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To: Kevin O'Connor <kevin@koconnor.net>
Cc: Gerd Hoffmann <kraxel@redhat.com>, Gleb Natapov <gleb@redhat.com>, qemu-devel@nongnu.org

On Sat, 7 Jan 2012, Gerhard Wiesinger wrote:
> No NIC:
> -net none
> => No iPXE ROM (correct).
>
> but with the previously listed config no iPXE ROM should be there. Saw this 
> is done through paravirtualization from Seabios/QEMU or KVM. So there
> must be a bug with the empty romfile options with net or device (I guess) in 
> QEMU/KVM.

I think I found the bug:
pcnet-pci.c
static int pci_pcnet_init(PCIDevice *pci_dev)
{
...
     if (!pci_dev->qdev.hotplugged) {
         static int loaded = 0;
         if (!loaded) {
             rom_add_option("pxe-pcnet.rom", -1);
             loaded = 1;
         }
     }

Option rom is added unconditionally regardless of command line options 
due to hot plug feature ...

grep -ir rom_add_option .
./ne2000.c:            rom_add_option("pxe-ne2k_pci.rom", -1);
NE2000 also has the same problem.

RTL8139 and all others are done through romfile which are working 
correct:
./rtl8139.c:    .romfile    = "pxe-rtl8139.rom",

Ciao,
Gerhard

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