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SubjectRe: [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:
>> 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:
>>>> 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
>>>> 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
>>>> --
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>>>> the body of a message to
>>>> More majordomo info at
>> - Sam Ruby

- Sam Ruby

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