WSOD (ticket #1841) (unofficial) survey question
tonyberth at googlemail.com
Thu Nov 13 18:27:27 CET 2008
On Thu, Nov 13, 2008 at 4:50 PM, Petr Vanek <vanous at penguin.cz> wrote:
> On Thu, 13 Nov 2008 09:03:53 +0000
> >They can reflect the same underlying issue, GPIO control of Glamo pins
> >that talk to the ASIC in the LCM is broken somehow / sometimes.
> >| That "level shifter" is definitely evil, if you pop the can and
> >touch it | with a scope probe it hard resets the Glamo, as you would
> >expect with | such high source impedence. Other things seem to be
> >able to make spikes | on it too somehow. But to be fair to it I never
> >saw it make a failure | in normal operation, only during suspend /
> >resume time. |
> >|> I am creating/programm for years yC based designs and not long ago
> >I've seen
> >|> some similar thing.
> >|> The schematic worked perfect and sometimes only partly. I thought
> >little |> gremlins must be in there - but the result was only two
> >resistors wich |> drives some parts to close to their specifications.
> >Yes as I say it is "definitely evil". But I think we can work around
> >it since we never see it reset in normal operation -->
> >| In stable-tracking we work around this by always hard resetting the
> >| Glamo on resume ourselves on the basis there can have been an
> >| uncontrolled reset in the meanwhile.
> When i observe booting process the screen first shows the NAND (NOR)
> menu, then NAN read, kernel (or instead it reads Openmoko) then goes
> clear bright white (as WSOD) for a while and then kernel messages. Then
> (this is the interesting part) goes blank all together and then only X
> server starts and the rest. During this blank period the WSOD does not
> happen and i wonder why... although perhaps this is because the screen
> is probably not completely dark but stays grayish?
just a general comment, when I switched to the FDOM distro (from the 2008.9)
no WSOD problems occured any more!
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