"Page Fault" message on XO-1 and another Fix Clock question

[Christoph Derndorfer]

On Mon, Feb 4, 2013 at 2:25 PM, Christoph Derndorfer <
christoph.derndorfer at gmail.com> wrote:

> Hey James,
>
> On Mon, Feb 4, 2013 at 5:32 AM, James Cameron <quozl at laptop.org> wrote:
>
>> On Mon, Feb 04, 2013 at 12:58:47AM +0200, Christoph Derndorfer wrote:
>> > (1) on Friday while looking at one of the XO-1s which didn't show
>> > anything on the display (even with a display which was known to
>> > work) with the serial adapter I saw the attached output.
>>
>> Reviewed, thanks.
>
>
> thanks a lot for the quick reply.
>
>
>>  > Looking at the wiki now and given the number of "invalid system
>> > date" issues we saw on other machines I assume this is a case of the
>> > "page fault" message situation described on
>> > http://wiki.laptop.org/go/Fix_Clock# If_the_screen_does_not_turn_on.
>>
>> Yes, this is likely.
>>
>
> Turns out this was indeed the issue and I now fixed it.
>
>
>>  > Or are there any other issues which could produce such an output?
>>
>> There might be, but if you have a version before Q2D05 which was
>> released in 2007, there's almost no chance of anybody remembering
>> anything useful.  It has been more than five years!
>>
>> To verify that the Page Fault is happening because of the known
>> problem (ticket #5391, svn 752), please use the Open Firmware ok
>> prompt to display the values in the real-time clock, using the .clock
>> command:
>>
>>         ok .clock
>>
>> If the month is invalid, then the Page Fault is most likely to be the
>> one expected.
>>
>> Another method would be to take an XO-1 with Q2D06 or earlier, remove
>> the clock battery, force the problem again, and see if the serial log
>> looks the same.  I expect it will.
>>
>> There are other methods to diagnose, but these require immediate
>> collaboration with a firmware engineer, and I don't think it is worth
>> doing that yet.
>>
>> > (2) Mike sent me a bunch of ML 1220 batteries as replacements for
>> > the XO-1 units which showed the "invalid system date"
>> > messages. However even with the new batteries in-place, after
>> > verifying that the (old) battery holders looked okay and having set
>> > the current time on the command-line the system date reverted back
>> > to 2000-01-01 00:00:00 after every reboot (and hence the "invalid
>> > system date" message kept coming up again). Any suggestions on what
>> > to do in such a situation?
>>
>> Charge the battery before the power cycle test.  On the XO-1, "it will
>> recharge from the main power source while the laptop is powered on and
>> fully awake (not suspended)."
>>
>> "When recharging an empty battery, it is expected that the battery
>> will reach normal voltage levels after around 30 minutes of charging,
>> but will require potentially 24 hours for a complete recharge."
>>
>> http://wiki.laptop.org/go/Fix_Clock#RTC_power_dynamic has the above
>> text.
>>
>
> Thanks a lot for that information, I had somehow managed to miss it.
>
> I'm now charging the four XO-1s which are here in the office and still
> displaying the "invalid system date" error. Let's see whether it works out.
>

FWIW: Still no luck even though they have been charging for an hour now and
automatic power saving is turned off... :-/

However seeing that I have to leave the office in 2~3 hours to catch my
plane back home and the laptops do work just fine (outside of displaying
the error message at the beginning) I guess I'll just have to leave it at
that.

Cheers,
Christoph


> Check that the battery voltage is reasonable.
>>
>> Check that the connector is passing the voltage properly to the
>> circuit board.
>>
>
> Unfortunately I don't have any measuring equipment here so I can't do that.
>
>
>> Also, please make sure you upgrade the firmware as soon as you can, so
>> that you aren't impacted by this problem any further.
>
>
> All of the concerned XO-1s which have this problem are running firmware
> Q2F12 (and 12.1.0).
>
> Cheers,
> Christoph
>
> --
> Christoph Derndorfer
>
> volunteer, OLPC (Austria) [www.olpc.at]
> editor, OLPC News [www.olpcnews.com]
> contributor, TechnikBasteln [www.technikbasteln.net]
>
> e-mail: christoph at derndorfer.eu
>
>


-- 
Christoph Derndorfer

volunteer, OLPC (Austria) [www.olpc.at]
editor, OLPC News [www.olpcnews.com]
contributor, TechnikBasteln [www.technikbasteln.net]

e-mail: christoph at derndorfer.eu
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