From mboxrd@z Thu Jan  1 00:00:00 1970
From: Fabio Fantoni <fabio.fantoni@m2r.biz>
Subject: Re: [Qemu-devel] Test report for xen-unstable and qemu-xen
Date: Wed, 14 Aug 2013 12:54:06 +0200
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To: Laszlo Ersek <lersek@redhat.com>
Cc: xen-devel <xen-devel@lists.xensource.com>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>, George Dunlap <George.Dunlap@eu.citrix.com>, seabios <seabios@seabios.org>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, pkg-qemu-devel@lists.alioth.debian.org, Gerd Hoffmann <kraxel@redhat.com>
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Il 14/08/2013 11:56, Laszlo Ersek ha scritto:
> On 08/14/13 11:19, Fabio Fantoni wrote:
>
>> Tried with qemu 1.4.2 and it works also with 4 gb of ram.
>> This ram regression seems to be introduced with qemu 1.5, and there is
>> another regression more critical with qemu 1.6.
> Can you save qemu's stderr for the 1.5->1.6 regression?
>
>> Tried to add seabios debug options to domU xl configuration file...
>>
>> device_model_args=["-chardev
>> stdio,id=seabios","-device","isa-debugcon,iobase=0x402,chardev=seabios"]
>>
>> But it doesn't boot
>>
>> /var/log/xen/qemu-dm-W7.log
>> qemu-system-x86_64: -chardev stdio,id=seabios: invalid option
> That's probably because you forgot to break up this option into
> separate python list entries:
>
> device_model_args=["-chardev", "stdio,id=seabios", "-device", "isa-debugcon,iobase=0x402,chardev=seabios"]
>
> Laszlo
>

Thanks for your reply and sorry for my very stupid error.
I retried with the correct parameters and on both cases (2 gb of ram 
working and 4gb of ram not working) I get only this one more line on 
qemu log:
Start bios (version debian/1.7.3-1-1-ga76c6f1-dirty-20130813_122010-test)

The probable cause is that on xen, seabios doesn't generate some tables 
but it takes the static ones from hvmloader.