[Buildroot] [help] Nitrogen6X with Vivante : restart on Qt5 examples

[Mylene Josserand <mylene.josserand@free-electrons.com>]

Gary,


Thank you for your help.


On 25/04/2016 11:18, Gary Bisson wrote:
> Mylene, All,
>
> On Mon, Apr 25, 2016 at 10:57 AM, Mylene Josserand
> <mylene.josserand@free-electrons.com> wrote:
>> Hi,
>>
>>
>> I am currently trying OpenGL with Vivante driver on a Nitrogen6X using
>> Buildroot.
>
> Can you specify which version of Buildroot? v2016.02 or master or older?
>
> This will help a lot to know the version of Qt, X11 etc...


Yes, sorry to forget this information.

I am currently on 2016.02-rc2. I will update to v2016.02 soon. If it 
could help you, I can update it right now.


>> Previously, I got an segfault error while starting X.
>> "Segmentation fault at address 0xe0"
>>
>> Thanks to Gary Bisson (in cc), using the galcore module from Buildroot
>> (BR2_PACKAGE_KERNEL_MODULE_IMX_GPU_VIV=y) and not the kernel one + updating
>> the kernel to 3.14.28, solved the issue.
>>
>> With the galcore driver loaded using insmod, the Vivante is, now, working.
>
> Same here, please specify the exact Vivante libraries version
> (5.0.11p6.3 or 7.1).


Vivante libraries : version 5.0.11.p7.1


>
>> I compiled Qt5 examples (BR2_PACKAGE_QT5BASE_EXAMPLES=y) and I tested some
>> openGL examples :
>>     - "qopenglwindow" : This example is working fine
>>     - "textures" example : in many case, the board restarts when the
>> application is launched.
>>     - "hellogl" : I see the Qt logo from the example but when I try to move
>> the object, the board restarts.
>>
>> Here is my Xorg.log, in case it could help :
>> http://paste.debian.net/hidden/609ae872/
>
> Can you share you xorg.conf? Also specify your setup, how many
> displays connected, which port (HDMI, LVDS, RGB etc..).

Here is my Xorg.conf :

Section "Device"
     Identifier  "i.MX Accelerated Framebuffer Device"
     Driver      "vivante"
     Option      "fbdev"     "/dev/fb0"
     Option      "vivante_fbdev" "/dev/fb0"
     Option      "HWcursor"  "false"
EndSection

Section "ServerFlags"
     Option "BlankTime"  "0"
     Option "StandbyTime"  "0"
     Option "SuspendTime"  "0"
     Option "OffTime"  "0"
EndSection


I have one HDMI display (1208x720 66Hz).


>
>> Each time the board reboots, I get an "POR" reset cause in UBoot.
>
> Well then it's a feature, the Qt app appears to be restarting the
> board properly ;-)
>
>> Maybe, I have a misconfiguration or I am doing something wrong.
>> Any help would be great !
>
> This might sound strange, but please also provide the U-Boot version
> you are using. The reason is that we offer a wide range of displays,
> since we want customers to have a plug and play experience we've added
> something for kernel >=3.14 where U-Boot is in charge of modifying the
> device tree on the fly to setup the displays properly.


Interesting, my uboot version is : U-Boot 2013.07.


> Finally, can you upload your image for me to try?


Yes, images are coming :)


-- 
Myl?ne Josserand, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com