From: Fabrice Bellard <fabrice@bellard.org>
To: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] PCI IRQ routing problems
Date: Thu, 14 Sep 2006 23:32:09 +0200 [thread overview]
Message-ID: <4509CA59.20908@bellard.org> (raw)
In-Reply-To: <c1bf1cf0609131110w278a7bdcyca64cccb638ce76a@mail.gmail.com>
Ed Swierk wrote:
> Linux 2.6.17 running on the latest qemu snapshot is unable to route
> IRQs to more than 4 network interfaces when running without ACPI, and
> is limited to 2 network interfaces with ACPI enabled.
> [...]
> I suspect the problem in the non-ACPI case is caused by a limitation
> in the PCI IRQ routing table in the Bochs BIOS, but I haven't a clue
> how to fix it. Any ideas would be appreciated.
I did not study the issue yet, but I suspect it is a Bochs BIOS issue (I
remember it declares a limited number of PCI slots for example).
IMHO, all the PCI, MP table and ACPI table init should be moved to the
Bochs BIOS. I did not do it because it was not strictly necessary to
have something that works. A simple way to do that is to copy the
relevant QEMU code in a separate section of the Bochs BIOS and to
execute it by switching temporarily to 32 bit protected mode in the BIOS
init code.
Fabrice.
prev parent reply other threads:[~2006-09-14 21:31 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-13 18:10 [Qemu-devel] PCI IRQ routing problems Ed Swierk
2006-09-14 21:32 ` Fabrice Bellard [this message]
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