Re: Discussion: ACPI selective IRQ blacklist

[James Courtier-Dutton <James-l7zRWeYnyd2TY6FTCsQk+9Bc4/FLrbF6@public.gmane.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




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