From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gra-vd1.iram.es (gra-vd1.iram.es [150.214.224.250]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTP id 173C767A46 for ; Mon, 28 Mar 2005 20:23:22 +1000 (EST) From: Gabriel Paubert Date: Mon, 28 Mar 2005 12:16:49 +0200 To: Pavel Fedin Message-ID: <20050328101649.GA27913@iram.es> References: <42485636.4000106@rambler.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <42485636.4000106@rambler.ru> Cc: linuxppc-dev@ozlabs.org Subject: Re: Again ISA DMA question List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Mon, Mar 28, 2005 at 02:08:38PM -0500, Pavel Fedin wrote: > Hello, all! > > In a source code or AROS operating system (http://www.aros.org) i > found this comment: > > --- cut --- > The older PReP machines have the DMA area limited to first 16MB of > system > memory. Therefore it is reasonable, to place the kernel at the end > of DMA > RAM. Both areas may be then easily separated. > --- cut --- > > Does this mean that Linux has an option to limit DMA memory space to > first 16 MB? PReP machines are fully supported i guess. Or not fully? Well, actually if you are courageous, many PreP machines have an extended ISA DMA with 32 bits addressing capability (this depends on the ISA bridge). But ISA DMA is only used for floppy and I have never connected a floppy to my Prep machines sicne I got the first one back in 1997. Regards, Gabriel