From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Courtier-Dutton Subject: Re: Discussion: ACPI selective IRQ blacklist Date: Thu, 04 Sep 2003 02:47:16 +0100 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <3F5699A4.3090608@superbug.demon.co.uk> References: <200309032316.11076.adq_dvb@lidskialf.net> <200309040215.23281.adq_dvb@lidskialf.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <200309040215.23281.adq_dvb-fmPXVN3awWJAJAzL26g0SA@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: To: Andrew de Quincey Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, linux-acpi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org List-Id: linux-acpi@vger.kernel.org Andrew de Quincey wrote: > On Wednesday 03 September 2003 23:16, Andrew de Quincey wrote: > >>So: >>If a motherboard is dodgy and IS in the bad-routing-blacklist, ACPI will >>not be used for PCI routing. >> >>If a motherboard is dodgy and is NOT in the bad-routing-blacklist, the >>fallback to picmode code should catch it. If the user then wants APIC with >>ACPI, they report the issue and the board is added to the >>bad-routing-blacklist. > > > On further thought, I realise this isn't future proof. This relies on the > existence of legacy BIOS tables (e.g. MPBIOS). My machine for one does not > have such a table; instead it relies on ACPI. > > In the meantime, VIA have kindly sent me the docs I need. It turns out the PCI > routing entries for the problem BIOSes are wrong. The south bridge chip in > question is the VT8235 (device ID 0x1337), which explains the spread of > motherboards I've been seeing. > > I have a solution in mind; should have something in the next few days. > Would it be possible to bypass the BIOS completely, and talk to the chips on the motherboard direct ? It should work, unless the BIOS provides information that the chips on the motherboard do not have. At a guess, I would say that the chips on the motherboard might not have information like a wiring diagram. Cheers James ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf