From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Tue, 20 Mar 2007 21:37:12 +0000 (GMT) Received: from localhost.localdomain ([127.0.0.1]:34198 "EHLO dl5rb.ham-radio-op.net") by ftp.linux-mips.org with ESMTP id S20022522AbXCTVhK (ORCPT ); Tue, 20 Mar 2007 21:37:10 +0000 Received: from denk.linux-mips.net (denk.linux-mips.net [127.0.0.1]) by dl5rb.ham-radio-op.net (8.13.8/8.13.8) with ESMTP id l2KLYxcv004551; Tue, 20 Mar 2007 21:35:10 GMT Received: (from ralf@localhost) by denk.linux-mips.net (8.13.8/8.13.8/Submit) id l2KEm9fp012916; Tue, 20 Mar 2007 14:48:09 GMT Date: Tue, 20 Mar 2007 14:48:09 +0000 From: Ralf Baechle To: Atsushi Nemoto Cc: linux-mips@linux-mips.org Subject: Re: ZONE_DMA on MIPS Message-ID: <20070320144809.GA12680@linux-mips.org> References: <20070319154821.GA31766@linux-mips.org> <20070320.013608.103777227.anemo@mba.ocn.ne.jp> <20070319222031.GB8707@linux-mips.org> <20070320.231013.128618011.anemo@mba.ocn.ne.jp> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070320.231013.128618011.anemo@mba.ocn.ne.jp> User-Agent: Mutt/1.4.2.2i 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: 14598 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 Tue, Mar 20, 2007 at 11:10:13PM +0900, Atsushi Nemoto wrote: > On Mon, 19 Mar 2007 22:20:31 +0000, Ralf Baechle wrote: > > It's probably reasonable to do something like: > > > > config GENERIC_ISA_DMA > > bool > > select ZONE_DMA > > > > I don't think we should expose such deep technical details to the Kconfig > > user. > > Thanks. I'll try. GENERIC_ISA_DMA_SUPPORT_BROKEN also should select > ZONE_DMA, right? That one is actually a more interesting issue. GENERIC_ISA_DMA_SUPPORT_BROKEN is needed on Indigo 2 but Indigo 2 has no mmeory other than a little bit for the exception vectors mapped into the low 16MB. At this stage nobody seems to know if the machine actually can support ISA DMA or not. Anyway, that means that for now it seems better to leave ZONE_DMA disabled. But maybe somebody who knows a little more about EISA support on Indigo 2 should comment. Ralf