linux-kernel - Re: PCI card initialisation at boot

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Date:	Sun, 11 Nov 2007 16:22:15 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matt Domsch <Matt_Domsch@...l.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Keith Chew <keith.chew@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: PCI card initialisation at boot

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
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