From mboxrd@z Thu Jan 1 00:00:00 1970 Received: with ECARTIS (v1.0.0; list linux-mips); Mon, 19 Mar 2007 15:50:22 +0000 (GMT) Received: from localhost.localdomain ([127.0.0.1]:45954 "EHLO dl5rb.ham-radio-op.net") by ftp.linux-mips.org with ESMTP id S20021775AbXCSPuU (ORCPT ); Mon, 19 Mar 2007 15:50:20 +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 l2JFmM5j001981; Mon, 19 Mar 2007 15:48:22 GMT Received: (from ralf@localhost) by denk.linux-mips.net (8.13.8/8.13.8/Submit) id l2JFmLfK001980; Mon, 19 Mar 2007 15:48:21 GMT Date: Mon, 19 Mar 2007 15:48:21 +0000 From: Ralf Baechle To: Atsushi Nemoto Cc: linux-mips@linux-mips.org Subject: Re: ZONE_DMA on MIPS Message-ID: <20070319154821.GA31766@linux-mips.org> References: <20070320.000947.88474417.anemo@mba.ocn.ne.jp> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070320.000947.88474417.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: 14561 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 12:09:47AM +0900, Atsushi Nemoto wrote: > Some ZONE_DMA patches were merged in 2.6.21. On most MIPS, ZONE_DMA > is not needed, isn't it? > > Currently JAZZ, MALTA, QEMU, IP22, SNI_RM, RBTX4938 defines > GENERIC_ISA_DMA so they may need ZONE_DMA (though I wonder QEMU or > RBTX4938 really need it...) > > Are there any other platforms requires special DMA zone? Qemu supports more or less the full PC braind^Wheritage, including the good old too-old floppy controller. IP22 supports Indigo 2 systems which have EISA support, so we only want ZONE_DMA if EISA is enabled. For a bunch of other systems ZONE_DMA may be required to support b0rked PCI cards that only support like 31-bit DMA addresses or even less. Ralf