From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261211AbUL2A7d (ORCPT ); Tue, 28 Dec 2004 19:59:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261271AbUL2A7c (ORCPT ); Tue, 28 Dec 2004 19:59:32 -0500 Received: from dsl-209-183-20-58.tor.primus.ca ([209.183.20.58]:11648 "EHLO node1.opengeometry.net") by vger.kernel.org with ESMTP id S261211AbUL2A70 (ORCPT ); Tue, 28 Dec 2004 19:59:26 -0500 Date: Tue, 28 Dec 2004 19:59:22 -0500 From: William Park To: linux-kernel@vger.kernel.org Subject: Re: waiting 10s before mounting root filesystem? Message-ID: <20041229005922.GA2520@node1.opengeometry.net> Mail-Followup-To: linux-kernel@vger.kernel.org References: <20041227195645.GA2282@node1.opengeometry.net> <20041227201015.GB18911@sweep.bur.st> <41D07D56.7020702@netshadow.at> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <41D07D56.7020702@netshadow.at> User-Agent: Mutt/1.4.2i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Dec 27, 2004 at 10:23:34PM +0100, Andreas Unterkircher wrote: > >>How do I make the kernel to wait about 10s before attempting to > >>mount root filesystem? Is there obscure kernel parameter? > >> > >>I can load the kernel from /dev/fd0, then mount /dev/hda2 as root > >>filesystem. But, I can't seem to mount /dev/sda1 (USB key drive) as > >>root filesystem. All relevant USB and SCSI modules are compiled > >>into the kernel. I think kernel is too fast in panicking. I would > >>like the kernel to wait about 10s until 'usb-storage' and 'sd_mod' > >>work out all the details. > > > >This is really suited to the task of an initrd, then you can spin > >until the usb storage device comes up in a bash script or something > >similar. > > Or you could try a patch from Randy Dunlap & Eric Lammerts [1] which > loops around in do_mounts.c > until the root filesystem can be mounted.... not that beautiful - but it > works :) > > [1] http://www.xenotime.net/linux/usb/usbboot-2422.patch > > Cheers, > Andreas > > PS: In the same manner you can do it with 2.6 Thanks Andreas. I can now boot from my el-cheapo USB key drive (256MB SanDisk Cruzer Mini). Since mine takes about 5sec to show up, I decided to wait 5sec instead of 1sec. Here is diff for 2.6.10: --- ./init/do_mounts.c--orig 2004-12-27 17:36:35.000000000 -0500 +++ ./init/do_mounts.c 2004-12-28 17:27:26.000000000 -0500 @@ -301,7 +301,14 @@ retry: root_device_name, b); printk("Please append a correct \"root=\" boot option\n"); +#if 0 /* original code */ panic("VFS: Unable to mount root fs on %s", b); +#else + printk ("Waiting 5 seconds to try again...\n"); + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(5 * HZ); + goto retry; +#endif } panic("VFS: Unable to mount root fs on %s", __bdevname(ROOT_DEV, b)); out: -- William Park Open Geometry Consulting, Toronto, Canada Linux solution for data processing.