From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Davidlohr Bueso A." Subject: Re: Problems with DMA enabling Date: Wed, 17 Aug 2005 13:31:25 -0400 Message-ID: <1124299885.3851.7.camel@localhost> References: <1124293208.3885.10.camel@localhost> <1124294354.5948.18.camel@localhost.localdomain> Reply-To: dbueso@linuxchile.cl Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from pc-79-164-104-200.cm.vtr.net ([200.104.164.79]:29917 "EHLO localhost") by vger.kernel.org with ESMTP id S1751184AbVHQRcz (ORCPT ); Wed, 17 Aug 2005 13:32:55 -0400 In-Reply-To: <1124294354.5948.18.camel@localhost.localdomain> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Erik Slagter Cc: linux-ide@vger.kernel.org On Wed, 2005-08-17 at 17:59 +0200, Erik Slagter wrote: > On Wed, 2005-08-17 at 11:40 -0400, Davidlohr Bueso A. wrote: > ROFL! Sorry... I didn't mention that I recompiled/rebooted my system after making the changes because it is obvious that I did it. I'm also not using my debian-precompiled kernel -> I got 2.6.12.3 from kernel.org > > You're changing a kernel BUILDING parameter here. It will not have any > effect until you recompile your kernel, so kiss your debian pre-compiled > kernel goodbye ;-) > > There are actually several HOWTO's for kernel (re)building, btw. > > If you are going to do this, you need to apply this patch as well (see > attachment) or your computer will lock up every now and then. > > If you have built the new kernel and booted it, your cd/dvd drive will > now be claimed by libata and show up as /dev/scd0 instead of /dev/hdc > (or similar). Hdparm -d 1 will not work (either), but DMA will be used > anyway. I added the patch you attached, recompiled, rebooted and still can't use /dev/scd0 (not a valid block device), here's what I get with dmes| grep ata: libata version 1.11 loaded. ata_piix version 1.03 ata: 0x170 IDE port busy ata1: SATA max UDMA/133 cmd 0x1F0 ctl 0x3F6 bmdma 0xBFA0 irq 14 ata1: dev 0 cfg 49:0f00 82:746b 83:7fe9 84:4023 85:f469 86:3e49 87:4023 88:203f ata1: dev 0 ATA, max UDMA/100, 117210240 sectors: lba48 ata1: dev 0 configured for UDMA/100 scsi0 : ata_piix Thanks, Dave