[Buildroot] libqeglfs.so not found on imx6

[Jagan Teki <jagannadh.teki@gmail.com>]

On Mon, Mar 6, 2017 at 3:49 PM, Gary Bisson
<gary.bisson@boundarydevices.com> wrote:
> Hi Fabio,
>
> On Sat, Mar 4, 2017 at 8:41 PM, Fabio Estevam <festevam@gmail.com> wrote:
>> On Sat, Mar 4, 2017 at 11:47 AM, Fabio Estevam <festevam@gmail.com> wrote:
>>> Hi Gary,
>>>
>>> On Sat, Mar 4, 2017 at 9:33 AM, Fabio Estevam <festevam@gmail.com> wrote:
>>>
>>>> Not yet, still stuck at the "drmModeGetResources failed" error.
>>>
>>> I can also get this same error with the new kmscube package from:
>>> https://cgit.freedesktop.org/mesa/kmscube/log/
>>>
>>> # kmscube
>>> drmModeGetResources failed: Invalid argument
>>> failed to initialize legacy DRM
>>>
>>> It works if I explicitly pass the /dev/dri device:
>>>
>>> kmscube -D /dev/dri/card1
>>>
>>> I think QT5 is trying to access /dev/dri/card0, but it should be using
>>> /dev/dri/card1 instead.
>>
>> Yes, this is the problem.
>>
>> If I do an ugly hack like this:
>>
>> --- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsdevice.cpp
>> +++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_kms/qeglfskmsdevice.cpp
>> @@ -344,7 +344,7 @@ bool QEglFSKmsDevice::open()
>>      Q_ASSERT(m_gbm_device == Q_NULLPTR);
>>
>>      qCDebug(qLcEglfsKmsDebug) << "Opening device" << m_path;
>> -    m_dri_fd = qt_safe_open(m_path.toLocal8Bit().constData(), O_RDWR
>> | O_CLOEXEC);
>> +    m_dri_fd = qt_safe_open("/dev/dri/card1", O_RDWR | O_CLOEXEC);
>>      if (m_dri_fd == -1) {
>>          qErrnoWarning("Could not open DRM device %s", qPrintable(m_path));
>>          return false;
>> --
>> 2.7.4
>>
>> Then the demo is launched. It still do not run very well, but at least
>> it starts.
>>
>> Does anyone have an idea on what would be a proper fix?
>
> That's strange I didn't have to do that. Worst part is that my demo
> image is using Qt5.6.2 (same as your image) and that I checked no
> special env variable is set.
>
> Maybe you can try your kernel on my image, see if that works.

I just used rootfs, from the link, and kernel 4.9.13 mainline.

Able to see the demo nicely.

Order:
- kmscube
- Boundary devices Tux
- jellyfish
- ideas in motion
- 28 fps (1. Lord of the Rings)

So, I'm investigating config options on buildroot will let you know
for further update.

thanks!
-- 
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.