Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751063Ab0GFEQU (ORCPT ); Tue, 6 Jul 2010 00:16:20 -0400 Received: from mail-px0-f174.google.com ([209.85.212.174]:46934 "EHLO mail-px0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750850Ab0GFEQQ convert rfc822-to-8bit (ORCPT ); Tue, 6 Jul 2010 00:16:16 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=QLWGsJjfGFw4Lj2BoQd6PlbzdeswxrCNiw2O1KVV2yVuBx+hI/8ICgQwldJwr4cSx8 GNahO6ae2BFMtwv/f/xYKp5KW67EfDyvCnSyqIBHZXn/J3lkX4toxdNedZ3IEDabj9Kk Xv0m05kqFXblqmCtb3MThF3CEVwlH09Vhuxfw= MIME-Version: 1.0 In-Reply-To: <4C3271FF.9080308@gmail.com> References: <4C2F5ECB.1040505@kernel.org> <4C2F87C1.8000701@hardwarefreak.com> <4C2F9292.708@hardwarefreak.com> <4C31796C.8050209@kernel.org> <4C3271FF.9080308@gmail.com> Date: Mon, 5 Jul 2010 21:16:15 -0700 Message-ID: Subject: Re: Drives missing at boot From: Mark Knecht To: Robert Hancock Cc: Tejun Heo , Stan Hoeppner , Linux Kernel List , "linux-ide@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2517 Lines: 66 On Mon, Jul 5, 2010 at 4:59 PM, Robert Hancock wrote: > On 07/05/2010 10:48 AM, Mark Knecht wrote: >> >> On Sun, Jul 4, 2010 at 11:19 PM, Tejun Heo  wrote: >>> >>> Hello, >>> >>> On 07/04/2010 12:31 AM, Mark Knecht wrote: >>>> >>>> OK, I don't know if this is related but so far I cannot get the >>>> machine to boot if I set BIOS SATA configuration to AHCI. I believe >>>> that I have AHCI support as well as SATA support built into the kernel >>>> but when I set the BIOS to AHCI the machine just hangs saying it finds >>>> no medium. I assume that means no hard drive. I have to set SATA >>>> support to enhanced and then IDE to get the machine to boot at all. >>> >>> That's odd.  Can you please attach kernel boot log w/ ahci mode? >>> Booting a recent live CD and saving boot log from there should do the >>> trick. >>> >>> Thanks. >>> >>> -- >>> tejun >>> >> >> Hi Tehun, >>    Thanks for the help. >> >>    I tried a Gentoo install CD from last march. It's a 2.6.31 type >> kernel. Problem is the buffer depths are not big enough to capture the >> complete dmesg contents and I don't know a command line option to make >> it larger on the fly. If you know of one that's got a larger buffer - >> or a command to increase it at boot time - then let me know and I'll >> try again. >> >>    I'm attaching what I was able to catch for both AHCI and IDE >> settings in BIOS for the storage configuration option. >> >>    It seems to me that even in AHCI mode the machine does see all the >> hard drives. Maybe there's something about my boot partition that's >> having problems in AHCI mode only? If it sees /dev/sda then why >> wouldn't it find grub and at least show a grub menu? > > On some machines changing from IDE to AHCI messes up the boot order > selection in the BIOS - you may have to switch to AHCI, save settings, > reboot, go back into the BIOS and then make sure the disk boot order > settings are correct (whatever drive grub is installed on needs to be > first). > That's a very interesting idea Robert. Thanks. I'll have to be careful. I have 5 identical drives in the machine so figuring out which is which when I'm in BIOS might be a bit of a trick. I'll give it a go and report back. Cheers, Mark -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/