From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264257AbUBEFEJ (ORCPT ); Thu, 5 Feb 2004 00:04:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264290AbUBEFEI (ORCPT ); Thu, 5 Feb 2004 00:04:08 -0500 Received: from smtp-send.myrealbox.com ([192.108.102.143]:59000 "EHLO smtp-send.myrealbox.com") by vger.kernel.org with ESMTP id S264257AbUBEFEH (ORCPT ); Thu, 5 Feb 2004 00:04:07 -0500 Message-ID: <4021CEDF.3030705@myrealbox.com> Date: Thu, 05 Feb 2004 10:34:31 +0530 From: romit dasgupta User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.2.1) Gecko/20030225 X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: [OT] DMA access from a non-bus master PCI device? Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello, I have a PCI device that cannot be a PCI bus master (only a PCI target). For some reason it has a DMA controller. Since it can't be a bus master I can't initiate DMA transfers from this PCI device to system RAM. My question is, can we use the motherboard's DMA controller to perform this transfer? In some of the documents that I got in the web (http://www.pcguide.com/ref/mbsys/res/dma/func.htm), it is mentioned that the 8237 DMA controller that comes with standard motherboard chipsets, can only be used for DMA transfers over the ISA bus. Any comments are welcome. Regards, -Romit