From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932188AbVI2H4h (ORCPT ); Thu, 29 Sep 2005 03:56:37 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932189AbVI2H4h (ORCPT ); Thu, 29 Sep 2005 03:56:37 -0400 Received: from port-83-236-157-249.static.qsc.de ([83.236.157.249]:12936 "EHLO kaasa.com") by vger.kernel.org with ESMTP id S932188AbVI2H4g (ORCPT ); Thu, 29 Sep 2005 03:56:36 -0400 Message-ID: <433B9E31.5040406@gmail.com> Date: Thu, 29 Sep 2005 09:56:33 +0200 From: Matteo Brusa User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: libata/ata_piix stuck in combined mode X-Enigmail-Version: 0.90.1.1 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, I'm running Sarge on a Dell PE 750, official Debian kernel 2.6.8-2-686, with 2 SATA disks. The disk controller is an Intel ICH5. Since I upgraded from kernel 2.4 to 2.6, the DMA disk access doesn't work anymore, because libata and ata_piix goes in combined mode: # grep -i ata /var/log/dmesg BIOS-e820: 000000003ffc0000 - 000000003ffcfc00 (ACPI data) Memory: 1031108k/1048320k available (1551k kernel code, 16284k reserved, 690k data, 148k init, 130816k highmem) libata version 1.02 loaded. ata_piix version 1.02 ata_piix: combined mode detected ata1: PATA max UDMA/33 cmd 0x1F0 ctl 0x3F6 bmdma 0xFEA0 irq 14 ata1: dev 0 cfg 49:0f00 82:0000 83:0000 84:0000 85:0000 86:0000 87:0000 88:0407 ata1: dev 0 ATAPI, max UDMA/33 ata1: dev 0 configured for UDMA/33 scsi0 : ata_piix ata2: SATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xFEA8 irq 15 ata2: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003 88:207f ata2: dev 0 ATA, max UDMA/133, 156250000 sectors: ata2: dev 0 configured for UDMA/133 scsi1 : ata_piix Vendor: ATA Model: Maxtor 6Y080M0 Rev: YAR5 EXT3-fs: mounted filesystem with ordered data mode. I've read some posts here about disabling the PATA/SATA mixed mode in the BIOS; too bad there's no such a switch in Dell servers. I tried to disable the IDE cdrom in the BIOS, with no luck. Also kernel 2.6.12 from Knoppix 4.0.2 couldn't help. Is there a way to force the ata_piix module out of combined mode? Thanks in advance.