<br><br><div class="gmail_quote">On Thu, Nov 13, 2008 at 4:50 PM, Petr Vanek <span dir="ltr"><<a href="mailto:vanous@penguin.cz">vanous@penguin.cz</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On Thu, 13 Nov 2008 09:03:53 +0000<br>
<div class="Ih2E3d">>They can reflect the same underlying issue, GPIO control of Glamo pins<br>
>that talk to the ASIC in the LCM is broken somehow / sometimes.<br>
><br>
>| That "level shifter" is definitely evil, if you pop the can and<br>
>touch it | with a scope probe it hard resets the Glamo, as you would<br>
>expect with | such high source impedence. Other things seem to be<br>
>able to make spikes | on it too somehow. But to be fair to it I never<br>
>saw it make a failure | in normal operation, only during suspend /<br>
>resume time. |<br>
>|> I am creating/programm for years yC based designs and not long ago<br>
>I've seen<br>
>|> some similar thing.<br>
>|> The schematic worked perfect and sometimes only partly. I thought<br>
>little |> gremlins must be in there - but the result was only two<br>
>resistors wich |> drives some parts to close to their specifications.<br>
><br>
>Yes as I say it is "definitely evil". But I think we can work around<br>
>it since we never see it reset in normal operation --><br>
><br>
>| In stable-tracking we work around this by always hard resetting the<br>
>| Glamo on resume ourselves on the basis there can have been an<br>
>| uncontrolled reset in the meanwhile.<br>
<br>
<br>
</div>When i observe booting process the screen first shows the NAND (NOR)<br>
menu, then NAN read, kernel (or instead it reads Openmoko) then goes<br>
clear bright white (as WSOD) for a while and then kernel messages. Then<br>
(this is the interesting part) goes blank all together and then only X<br>
server starts and the rest. During this blank period the WSOD does not<br>
happen and i wonder why... although perhaps this is because the screen<br>
is probably not completely dark but stays grayish?<br>
<font color="#888888"><br>
Petr</font></blockquote><div><br><br>just a general comment, when I switched to the FDOM distro (from the 2008.9) no WSOD problems occured any more! <br></div></div><br>