[Qt-embedded-interest] Qtopia2.2.0 on MPC5121

[Shen Li-R64465]

Hi,Alex
Thanks for your information. I have confirmed that is is rlated with the white color. After I config qtopia as black background , the system won't crash. I also test it on a customers board, and it won't crash when displaying full screen white. So it should be the boards issue , not the silicon issue.  I was told that the ADS512101 board has a errata about the power part which might cause system hung up. But the my board had already got it work around. I am guessing that the issue is not totally fixed. I might contact the STX support for this issue .

B.R
ShenLi

-----Original Message-----
From: qt-embedded-interest-bounces at trolltech.com [mailto:qt-embedded-interest-bounces at trolltech.com] On Behalf Of Alex Cucos
Sent: 2009年7月10日 linPM19:12
To: qt-embedded-interest at trolltech.com
Subject: Re: [Qt-embedded-interest] Qtopia2.2.0 on MPC5121


> Date: Fri, 10 Jul 2009 09:43:40 +0800
> From: "Shen Li-R64465" <Li.Shen at freescale.com>
> Subject: [Qt-embedded-interest] Qtopia2.2.0 on MPC5121e
> To: <qt-embedded-interest at trolltech.com>

> Hi,
> I have ported qtopia2.2.0 on MPC5121e. Now when I set the LCD 
> resolution as lower than 640x480, the qtopia can run smoothly.
> But if I use 800x600 or 1024x768, the system will crash(the console 
> output nothing, just frozen even if I enabled kernel debug info) . I 
> am sure that I have provide enough frame buffer size as I configed it 
> as 15MBytes. My kernel version is 2.6.24. Does this kernel has 
> limitation on supporting qtopia2.2.0 resolution?
>  
> Is there any idea about it?Thanks!
>  
> B.R
> ShenLi

Hi ShenLi,

I have crossed compiled Qt Embedded 4.5.0 for the MPC5121e board and experienced similar system crashes. They were happening after an image containing lots of white pixels (e.g. maximized QTextEdit widget) was written to the frame-buffer.

It seems to be a hardware problem and has nothing to do with Qt, I reproduced the crash from outside Qt by writing white pixels directly into the frame-buffer.

A temporary fix was to customize the Qt widgets, replacing the white background with a different color (e.g. light grey). 

Best regards,
Alex.

--
Alex Cucos
Senior Embedded Software Engineer
Blue Tree Systems
1, Galway Business Park
Dangan
Galway
Ireland
t: +353 91 520053
f: +353 91 520622
e: alex at bluetree.ie
w: http://www.bluetree.ie


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