Message-ID: <447C3B3D.10705@superbug.co.uk>
Date: Tue, 30 May 2006 13:31:57 +0100
From: James Courtier-Dutton <James@superbug.co.uk>
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To: Keith Chew <keith.chew@gmail.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: IO APIC IRQ assignment
References: <20f65d530605300521q1d56c3a3t84be3d92f1df0c14@mail.gmail.com>
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Keith Chew wrote:
>
> We asked the manufacturers if they can do a physical modication for
> us, but unfortunately this is not possible. The engineer did mention
> that under Windows XP in "IO APIC" mode, it is possible to assign
> different IRQs to the USB and BTTV.
>
> Is this possible in Linux? We have tried enabling IO APIC in the
> kernel, but the IRQs are still shared.
>
> Please advise if it is even possible in Linux to achieve what we want.
>

You could try enabling "Bus Options" ->
[*]   Message Signaled Interrupts (MSI and MSI-X)

or in .config
CONFIG_PCI_MSI=y

It only works for PCI devices.

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