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Date: Tue, 10 Feb 2009 21:06:51 -0500 From: Sam Ruby <rubys@...ertwingly.net> To: yakui_zhao <yakui.zhao@...el.com> CC: Len Brown <lenb@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Andrew Morton <akpm@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org>, "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, "x86@...nel.org" <x86@...nel.org>, "Maciej W. Rozycki" <macro@...ux-mips.org> Subject: Re: [APIC] Kernel panic, rsync corruption, intel q8200, 2.6.28-rc8 yakui_zhao wrote: > On Tue, 2009-02-10 at 19:46 +0800, Sam Ruby wrote: >> yakui_zhao wrote: >>> 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=serial,ttyS0,115200 apic=debug >>>>>>> >>>>>>> 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 installing minicom >>>>>> and also connecting it to ttyS0 at 115200 baud on the second machine, but when >>>>>> I boot the first machine I don't see any output on the terminal. >>>>> /boot/grub/menu.lst: >>>>> >>>>> serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1 >>>>> terminal --timeout=300 serial console >>> Do you have an opportunity to try the boot option of "acpi=off" as >>> suggested by Lenb? >> That also produces the "MP-BIOS bug" message and halts. > Do you mean that the box still can't be booted with ACPI disabled? If > so, it should be a BIOS bug. It had better be fixed by bios upgrading. Yes, that's what I mean. Linux won't boot with acpi=off, but will boot with noapic. This is a fairly new machine, and I have yet to see where ACER has posted a more recent BIOS for this model. > From the following test it seems that there exists the MPS table, > which describes how the timer is connected with I/O APIC. But > unfortunately it is still incorrect. > And the timer still can't work w/o the timer override. > > Only when I/O apic is skipped can the box be booted. The timer is > connected with 8259. And the timer can work as expected. But there > still exist other issue. > >>> From the log it seems that there exists the following warning >>> message: >>> >MP-BIOS bug: 8254 timer not connected to IO-APIC >>> >>> Can you try the following boot options? >>> a. acpi_use_timer_override >> That also produces the "MP-BIOS bug" message and halts. >> >>> b. acpi_skip_timer_override >> That also produces the "MP-BIOS bug" message and halts. >> >>> c. noapic >> With that, I can boot, but I get data corruption problems. Data >> corruption problems I don't see when using the same hardware but with >> Microsoft Vista. More details can be found here: >> >> http://intertwingly.net/blog/2009/01/20/noAPIC >> http://intertwingly.net/stories/2009/01/22/ >> >> I am willing to install new kernels on fresh hard drives, run diagnostic >> programs and report the output, including capturing serial output. Is >> there any data I can gather to help diagnose this problem? >> >>> Thanks. >>>>> is what I use. >>>>> >>>>> 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 line >>>>> if you wish. >>>> I've got that working now. I used minicom on the remote machine, >>>> capturing the output. You can see me fumbling around, editing the >>>> kernel command and booting here: >>>> >>>> http://intertwingly.net/stories/2009/02/09/minicom.out >>>> >>>> While it is difficult to make out what I did given line wrapping, etc, >>>> what I started with was: >>>> >>>> /boot/vmlinuz-2.6.27-11-generic >>>> root=UUID=4fce230e-fe72-4685-aab0-294ef1c20efa ro noapic quiet splash >>>> >>>> After editing, what I had was >>>> >>>> /boot/vmlinuz-2.6.27-11-generic >>>> root=UUID=4fce230e-fe72-4685-aab0-294ef1c20efa ro quiet splash >>>> earlyprintk=serial,ttyS0,115200 apic=debug >>>> >>>> As you can see, the last line I saw was "Starting up ...", after which >>>> point the "MP-BIOS bug: 8254 timer not connected to IO-APIC" etc output >>>> appeared on the monitor that is directly connected to the machine being >>>> booted (i.e., this text did not appear on the minicom session). >>>> >>>>> If this doesn't work, then the kernel earlyprintk is unlikely to work >>>>> also. >>>> At the moment, it looks like it works, but earlyprintk does not work for >>>> me, at least not on Ubuntu 8.10, kernel 2.6.27-11-generic. >>>> >>>>> Note that there may be some BIOS SETUP options related to the serial port >>>>> -- worth checking. >>>>> >>>>> Also, in minicom, be sure to turn off HW flow control >>>>> >>>>> there is a fancy serial console document someplace on this, >>>>> probably at http://tldp.org/ >>>> As I have managed to get grub to talk to the serial console, I did not >>>> explore these options further. Please let me know if there is something >>>> in particular I should explore. >>>> >>>>> good luck, >>>>> -Len >>>> - Sam Ruby >>>> -- >>>> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in >>>> the body of a message to majordomo@...r.kernel.org >>>> More majordomo info at http://vger.kernel.org/majordomo-info.html >> - Sam Ruby - Sam Ruby -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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