linux-kernel - Re: [PATCH] x86: update mptable v7

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Date:	Wed, 18 Jun 2008 23:35:58 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"Len Brown" <lenb@...nel.org>, "Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: update mptable v7

On Wed, Jun 18, 2008 at 11:28 PM, H. Peter Anvin <hpa@...or.com> wrote:
> Yinghai Lu wrote:
>>>
>>> Can somebody clue me into why this concept
>>> is something other than totally insane?
>>
>> for system that have 6 pcie slots and more, with full populated cards.
>> when boot with mptable, BIOS will use irq < 16 for all pci devices,
>> and several devices will share same irq.
>> but when acpi is enabled, irqs are spanned all over.
>>
>> also when pci card with several pci bridges is plugged in, the mptable
>> is totally messed up, some slot will work, and some doesn't work.
>
> And the reason to worry about supporting non-ACPI on such hardware is what?

1. some other os doesn't support acpi well, and still use mptable.
2. show BIOS engineer how to fix mptable.

YH
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