From: "H. Peter Anvin" <hpa@zytor.com>
To: Matt Domsch <Matt_Domsch@dell.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
Keith Chew <keith.chew@gmail.com>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: PCI card initialisation at boot
Date: Sun, 11 Nov 2007 16:22:15 -0800 [thread overview]
Message-ID: <47379CB7.6010404@zytor.com> (raw)
In-Reply-To: <20071111234313.GB15880@auslistsprd01.us.dell.com>
Matt Domsch wrote:
> On Sun, Nov 11, 2007 at 04:46:44PM +0000, Alan Cox wrote:
>> Linux by default uses the BIOS resource assignments. It doesn't know
>> where those came from other than "the BIOS".
>
> Slightly tangential, but I'm starting to hear requests to have the OS
> re-assign resources when it might make better sense. For example, if
> you have a graphics card with a 1GB memory allocation, the BIOS may
> assign it into address ranges below 4GB because it doesn't know
> if the OS will be 32-bit or 64-bit capable. But, it would be
> beneficial to have it located above 4GB, and to fill in the (new) hole
> below 4GB with RAM. Linux right now doesn't have a way to do this.
> It will assign resources for cards that the BIOS left unassigned, but
> won't intentionally move resources.
>
Not really. If the OS is 64-bit capable, it can just use the RAM above
4 GB.
-hpa
prev parent reply other threads:[~2007-11-12 0:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-11 15:22 PCI card initialisation at boot Keith Chew
2007-11-11 16:11 ` Andi Kleen
2007-11-11 16:46 ` Alan Cox
2007-11-11 23:43 ` Matt Domsch
2007-11-12 0:22 ` H. Peter Anvin [this message]
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