From owner-freebsd-questions@FreeBSD.ORG Tue Apr 27 00:44:07 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id EA6321065670 for ; Tue, 27 Apr 2010 00:44:07 +0000 (UTC) (envelope-from jamesbrandongooch@gmail.com) Received: from mail-iw0-f182.google.com (mail-iw0-f182.google.com [209.85.223.182]) by mx1.freebsd.org (Postfix) with ESMTP id 975698FC16 for ; Tue, 27 Apr 2010 00:44:07 +0000 (UTC) Received: by iwn12 with SMTP id 12so2568005iwn.15 for ; Mon, 26 Apr 2010 17:44:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=DFDE9XRdOiDlWzZfbZjdVy330sJcGv3Cjxogl8UY9zU=; b=CTn64yBGbd+mNNNgXrMo2AsgFssvcE/8LlZTNFJ1pVknvHawuxmV6wb92D2j+fDJFd Gyr+dKPspIM/aKbglytXazXg8bX+v+vg8bnav0DBTIPA9M5aZxUQdmFlw9ZByHc4Z0fP boYwzM4olSYDK8WwMY93Q8tAgYIgAlRmVvIAE= 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=gvRvIPlSOkyRDfSrf8QrC8BGqDcWJ6/nyDTGtxtlqUfFbFFSILZfe4af4qPJ93tI4o emjNyIvjU5c+H2TQjVj+Np3PVYZXq2qHMQRNV7KXb0L/boBos9NQohHDmqh3tkJOPPWh nGoh3YrvldIIJPB6YWWB8sAPgrCSzeKt2MArI= MIME-Version: 1.0 Received: by 10.231.156.80 with SMTP id v16mr1604383ibw.99.1272329042121; Mon, 26 Apr 2010 17:44:02 -0700 (PDT) Received: by 10.231.113.36 with HTTP; Mon, 26 Apr 2010 17:44:02 -0700 (PDT) In-Reply-To: <20100412231104.GA2376@alucard.int.rhavenn.net> References: <20100412231104.GA2376@alucard.int.rhavenn.net> Date: Mon, 26 Apr 2010 19:44:02 -0500 Message-ID: From: Brandon Gooch To: Henrik Hudson Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-questions@freebsd.org Subject: Re: what does "boot in safe mode" enable / disable? X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 27 Apr 2010 00:44:08 -0000 On Mon, Apr 12, 2010 at 6:11 PM, Henrik Hudson wrote: > I emailed a few days back, to -stable, =A0about having issues running 8-S= TABLE in a > Xen environment. I solved this, sort of. However, I didn't get any > bites over there. > > I have a XEN HVM environment and it was given to me running 8-REL-p2 > and it was working fine. I moved up to -STABLE and GENERIC wouldn't > boot. After some fiddling, etc.. I tried booting it in "safe mode" > and viola it boots fine. > > The system doesn't show any errors it just stops on "trying to mount > disk: /dev/xxxx". Enabling "logging mode" doesn't show any > difference between the stable kernel and the rel kernel when > booting. > > So, I'm guessing there was some sort of regression, but I'm trying > to isolate this. What does "booting in safe mode" enable / disable > that would allow the system to boot successfully? > > Thanks. > > Henrik > -- > Henrik Hudson > lists@rhavenn.net I've wondered this myself, having never actually booted into "safe mode". Here is a snippet from a reply to a related question from the archives: "Safe mode forces PIO mode (disabling the use of DMA) and disables write caching for all IDE hard drives and CD ROM drives, disables the probing of EISA slots (as very few systems have them), and in i386 it also disables the use of ACPI and the APICs." from "What is FreeBSD 5.3 Safe Mode?" http://lists.freebsd.org/pipermail/freebsd-current/2005-February/046882.htm= l -Brandon