From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Hancock Subject: Re: Setting up Silicon image 3114 in DMA mode Date: Fri, 25 Jun 2010 22:13:27 -0600 Message-ID: <4C257E67.9090101@gmail.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-iw0-f174.google.com ([209.85.214.174]:43153 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750894Ab0FZEN3 (ORCPT ); Sat, 26 Jun 2010 00:13:29 -0400 In-Reply-To: Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: amruth pattanada Cc: linux-ide@vger.kernel.org, LKML On 06/25/2010 02:25 AM, amruth pattanada wrote: > Hi > Can anybody please guide me what minimal steps to follow for setting > up 3114 for operating in DMA mode and looked into linux 2.6.32.7 code. > I am porting 3114 driver to RTOS but have problems in using BAR5 PCI > config space because of Memory mapped region issues. I can access BAR4 > and plan to set up DMA mode. > How do we access entire BAR5 memory space without using BAR5, is there > any indirect way to access BAR5 using BAR4. Please let me know. > Thanks > Amruth p.v > Sr.Embedded Engineer See the datasheet (PCI Configuration Space section), there's a way to access BAR5 registers using indirect access registers in configuration space. I expect this will be relatively slow, however.