Subject: Re: DRAM and PCI devices at same physical address
From: Matt Sexton <sexton@mc.com>
To: Ross Biro <ross.biro@gmail.com>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <8783be6604062812277ee07aa@mail.gmail.com>
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	 <8783be6604062812277ee07aa@mail.gmail.com>
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Date: 29 Jun 2004 10:31:30 -0400
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On Mon, 2004-06-28 at 15:27, Ross Biro wrote:
> On 25 Jun 2004 17:23:00 -0400, Matt Sexton <sexton@mc.com> wrote:
> 
> > 
> > Should they be appearing there at all?  Does Linux make any guarantees
> > when there is more physical memory than specified by "mem=" ?
> 
> You've told linux there is only 512M of physical memory and it
> believes you, so it is using the available address space for memory
> mapped i/o.  I know of no way to reserve memory on the command line.

Fair enough.  I was just following the advice of the "Linux Device
Drivers" book by Rubini & Corbet, where in the "Reserving High RAM
Addresses" section of Chapter 7, they describe exactly this method of
reserving memory for device drivers.

Matt

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