linux-kernel - Re: [PATCH 3/3] PCI: allocate bus resources from the top down

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Message-ID: <4C913F96.4020106@zytor.com>
Date:	Wed, 15 Sep 2010 14:50:14 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
CC:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Brian Bloniarz <phunge0@...mail.com>,
	Charles Butterfield <charles.butterfield@...tcentury.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Stefan Becker <chemobejk@...il.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 3/3] PCI: allocate bus resources from the top down

On 09/15/2010 02:09 PM, Bjorn Helgaas wrote:
> 
> On the machine above (a Dell T3500), the [mem 0xbff00000-0xbfffffff] region
> doesn't actually work and is likely a BIOS defect.  The symptom is that we
> move the AHCI controller to 0xbff00000, which leads to "Boot has failed,
> sleeping forever," a BUG in ahci_stop_engine(), or some other boot failure.
> 

Acked-by: H. Peter Anvin <hpa@...or.com>

... for the patch in general, but I would like to *also* request a DMA
or PCI quirk to explicitly reserve the above range on the affected Dell
machines.

	-hpa
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