From mboxrd@z Thu Jan 1 00:00:00 1970 From: yakui_zhao Subject: Re: [APIC] Kernel panic, rsync corruption, intel q8200, 2.6.28-rc8 Date: Tue, 10 Feb 2009 10:10:05 +0800 Message-ID: <1234231805.3706.80.camel@localhost.localdomain> References: <4978767D.4060700@intertwingly.net> <20090130000758.1dff0113.akpm@linux-foundation.org> <498885CC.4060509@intertwingly.net> <20090203114849.b661f1ce.akpm@linux-foundation.org> <49890B46.8020308@intertwingly.net> <4990C14B.7060802@intertwingly.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mga11.intel.com ([192.55.52.93]:28526 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752445AbZBJB6X (ORCPT ); Mon, 9 Feb 2009 20:58:23 -0500 In-Reply-To: <4990C14B.7060802@intertwingly.net> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Sam Ruby Cc: Len Brown , Thomas Gleixner , Andrew Morton , LKML , "linux-acpi@vger.kernel.org" , "x86@kernel.org" , "Maciej W. Rozycki" On Tue, 2009-02-10 at 07:50 +0800, Sam Ruby wrote: > Len Brown wrote: > >>> Do you have a second computer around with a serial port ? If yes,= then > >>> please add the following to the kernel command line: > >>> > >>> earlyprintk=3Dserial,ttyS0,115200 apic=3Ddebug > >>> > >>> and connect the serial ports with a null modem cable. Fire up a > >>> terminal program on the second machine and capture the output. > >> I do have a second computer, and went out and bought a null modem = adapter for > >> my serial cable and connected the two machines. I've tried instal= ling minicom > >> and also connecting it to ttyS0 at 115200 baud on the second machi= ne, but when > >> I boot the first machine I don't see any output on the terminal. > >=20 > > /boot/grub/menu.lst: > >=20 > > serial --unit=3D0 --speed=3D115200 --word=3D8 --parity=3Dno --stop=3D= 1 > > terminal --timeout=3D300 serial console Do you have an opportunity to try the boot option of "acpi=3Doff" as suggested by Lenb? From the log it seems that there exists the following warning message: >=EF=BB=BFMP-BIOS bug: 8254 timer not connected to IO-APIC Can you try the following boot options? a. acpi_use_timer_override b. acpi_skip_timer_override c. noapic Thanks. > >=20 > > is what I use. > >=20 > > this will give you a prompt from grub even before the kernel boots > > so you can select (and edit) your kernel via menu over the serial l= ine > > if you wish. >=20 > I've got that working now. I used minicom on the remote machine,=20 > capturing the output. You can see me fumbling around, editing the=20 > kernel command and booting here: >=20 > http://intertwingly.net/stories/2009/02/09/minicom.out >=20 > While it is difficult to make out what I did given line wrapping, etc= ,=20 > what I started with was: >=20 > /boot/vmlinuz-2.6.27-11-generic=20 > root=3DUUID=3D4fce230e-fe72-4685-aab0-294ef1c20efa ro noapic quiet sp= lash >=20 > After editing, what I had was >=20 > /boot/vmlinuz-2.6.27-11-generic=20 > root=3DUUID=3D4fce230e-fe72-4685-aab0-294ef1c20efa ro quiet splash=20 > earlyprintk=3Dserial,ttyS0,115200 apic=3Ddebug >=20 > As you can see, the last line I saw was "Starting up ...", after whic= h=20 > point the "MP-BIOS bug: 8254 timer not connected to IO-APIC" etc outp= ut=20 > appeared on the monitor that is directly connected to the machine bei= ng=20 > booted (i.e., this text did not appear on the minicom session). >=20 > > If this doesn't work, then the kernel earlyprintk is unlikely to wo= rk=20 > > also. >=20 > At the moment, it looks like it works, but earlyprintk does not work = for=20 > me, at least not on Ubuntu 8.10, kernel 2.6.27-11-generic. >=20 > > Note that there may be some BIOS SETUP options related to the seria= l port=20 > > -- worth checking. > >=20 > > Also, in minicom, be sure to turn off HW flow control > >=20 > > there is a fancy serial console document someplace on this, > > probably at http://tldp.org/ >=20 > As I have managed to get grub to talk to the serial console, I did no= t=20 > explore these options further. Please let me know if there is someth= ing=20 > in particular I should explore. >=20 > > good luck, > > -Len >=20 > - Sam Ruby > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi"= in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html