From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Thu, 29 Nov 2007 12:16:10 +0000 (GMT) Received: from localhost.localdomain ([127.0.0.1]:2961 "EHLO dl5rb.ham-radio-op.net") by ftp.linux-mips.org with ESMTP id S20029255AbXK2MQI (ORCPT ); Thu, 29 Nov 2007 12:16:08 +0000 Received: from denk.linux-mips.net (denk.linux-mips.net [127.0.0.1]) by dl5rb.ham-radio-op.net (8.14.1/8.13.8) with ESMTP id lATCFv1u010565; Thu, 29 Nov 2007 12:15:58 GMT Received: (from ralf@localhost) by denk.linux-mips.net (8.14.1/8.14.1/Submit) id lATCFvK7010564; Thu, 29 Nov 2007 12:15:57 GMT Date: Thu, 29 Nov 2007 12:15:57 +0000 From: Ralf Baechle To: Thomas Bogendoerfer Cc: linux-mips@linux-mips.org Subject: Re: [PATCH] IP28 support Message-ID: <20071129121557.GA10522@linux-mips.org> References: <20071126224004.D885AC2B26@solo.franken.de> <20071128143459.GA22943@linux-mips.org> <20071129095844.GA9106@alpha.franken.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20071129095844.GA9106@alpha.franken.de> User-Agent: Mutt/1.5.17 (2007-11-01) Return-Path: X-Envelope-To: <"|/home/ecartis/ecartis -s linux-mips"> (uid 0) X-Orcpt: rfc822;linux-mips@linux-mips.org Original-Recipient: rfc822;linux-mips@linux-mips.org X-archive-position: 17640 X-ecartis-version: Ecartis v1.0.0 Sender: linux-mips-bounce@linux-mips.org Errors-to: linux-mips-bounce@linux-mips.org X-original-sender: ralf@linux-mips.org Precedence: bulk X-list: linux-mips On Thu, Nov 29, 2007 at 10:58:44AM +0100, Thomas Bogendoerfer wrote: > I've changed that in the updated IP28 patch. I don't see a way to > support ISA busmaster devices, because they will generate a physical > address between 0 and 0x1000000, which will only hit the 512 KB > mirrored RAM. Anything which uses ISA slave DMA is able to address > the full 32bit address space. Those 512kB could be used as a fairly claustrophobic ZONE_DMA. Not pretty though. Ralf