From: Andre Przywara <andre.przywara@amd.com>
To: the uni <uni.the@gmail.com>
Cc: kvm <kvm@vger.kernel.org>
Subject: Re: Fast/Quiet Boot
Date: Sun, 1 Feb 2009 23:26:04 +0100 [thread overview]
Message-ID: <4986217C.6090909@amd.com> (raw)
In-Reply-To: <e623f0a40902011059p4faca9afv4eab76c3de13da57@mail.gmail.com>
the uni wrote:
> Heavy finger, disregard last message...
>
> I've been testing the new Moblin distro from linux, and it boots
> incredibly quickly (~7 secs to desktop in KVM)
>
> One irritation is that the bios takes up roughly half of that time.
> I've managed to throw in a few ifdefs into the bios/vgabios to
> get the screen cleared and the prompts to go away so that the first
> thing that you see after KVM is launched is an xfce desktop.
>
> This is a vast improvement in my opinion, but obviously one that's not
> always wanted/needed.
>
> It makes sense to me that if a --boot or --kernel parameter is given,
> that the "press f12 for boot menu..." should not be shown.
> Moreover, I think it makes sense to show no bios messages at all if
> --kernel is given. This improves boot time by ~3 secs
> on my machine, meaning I get a moblin xfce desktop in ~4 secs.
>
> So here's my question: Is it posible to send a parameter to the bios?
> I'd like to change the bios operation for the 2 parameters above, but
> haven't found a way to do it.
Are you looking for the firmware configuration interface?
Look at bios/rombios32.c for functions qemu_cfg_* and constants
QEMU_CFG_* for the BIOS side of the game and qemu/hw/fw_cfg.[ch] for the
QEMU interface side (functions here are prefixed with fw_cfg_). So
define a new channel and send your data over. Be sure to consider
qemu-devel if you want to send patches.
Hope that helps,
Andre.
--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 277-4917
----to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen
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next prev parent reply other threads:[~2009-02-01 22:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-01 18:57 Fast/Quiet Boot the uni
2009-02-01 18:59 ` the uni
2009-02-01 22:26 ` Andre Przywara [this message]
2009-02-04 1:53 ` the uni
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