From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 11 Feb 2002 13:33:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 11 Feb 2002 13:33:39 -0500 Received: from www.formation.com ([209.204.114.130]:5380 "EHLO formail.formation.com") by vger.kernel.org with ESMTP id ; Mon, 11 Feb 2002 13:33:21 -0500 From: "Steve Snyder" To: "Bill Davidsen" Cc: Subject: RE: Why won't my HD do DMA I/O? Date: Mon, 11 Feb 2002 13:30:26 -0600 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I should have noted this in my original post but, yes, I have enabled DMA in the kernel: # grep DMA /usr/src/linux-2.4.17/.config | grep -v '#' CONFIG_BLK_DEV_IDEDMA_PCI=y CONFIG_BLK_DEV_ADMA=y CONFIG_IDEDMA_PCI_AUTO=y CONFIG_BLK_DEV_IDEDMA=y CONFIG_IDEDMA_AUTO=y Thanks for the response. -----Original Message----- From: Bill Davidsen [mailto:davidsen@tmr.com] Sent: Monday, February 11, 2002 12:20 PM To: Steve Snyder Cc: linux-kernel@vger.kernel.org Subject: Re: Why won't my HD do DMA I/O? On Fri, 8 Feb 2002, Steve Snyder wrote: > I've got a system on which the hard disk cannot be set to use DMA. When I > attempt to enable DMA ("hdparm -d1 /dev/hda") on this drive, there is a long > time-out period, after which displaying the settings shows that DMA is still > not set. You did build this kernel with DMA support in the kernel, right? For your chipset? Vendor kernels have been known to err on the side of safty. -- bill davidsen CTO, TMR Associates, Inc Doing interesting things with little computers since 1979.