Message-Id: <200107250824.f6P8Oav126718@westrelay03.boulder.ibm.com>
Date: Wed, 25 Jul 2001 08:23:43
From: "John P. Hartmann" <john@vnet.ibm.com>
To: <LINUX-KERNEL@vger.kernel.org>
Subject: Reserving large amounts of RAM for busmastering PCI card.
Sender: linux-kernel-owner@vger.kernel.org
Original-Recipient: rfc822;linux-kernel-outgoing

 RE:  Reserving large amounts of RAM for busmastering PCI card.

 Please CC john@vnet.ibm.com on your replies.

 I have an IBM P390 card, which will use up to 512M of contiguous
 RAM for "expanded storage", which can be thought of as a swap device.

 On the 2.2 kernels I modified setup.c to parse RESERVE=nnnM and take
 that amount off the top of the bios-reported memory size.  My module
 then picks the address and size up from a place where I left them at
 boot time.

 Since the 2.4 kernels introduce the e820map structure, I'd like to
 plug into that infrastructure, and create a new type memory segment
 for this storage (I envisage having more than one segment), but in the
 2.4.4 kernel (which I am forced to remain with for quite a while) it
 seems not to be used apart from set up at boot time.

 I'm quite happy to do the work to generalise this, if I could get a
 pointer as to the direction that is envisaged.

 Thanks,

     j.                                                john@vnet.ibm.com
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