[Buildroot] libqeglfs.so not found on imx6

[Gary Bisson]

Hi Fabio,

On Sat, Mar 4, 2017 at 8:41 PM, Fabio Estevam <festevam at gmail.com> wrote:
> On Sat, Mar 4, 2017 at 11:47 AM, Fabio Estevam <festevam at gmail.com> wrote:
>> Hi Gary,
>>
>> On Sat, Mar 4, 2017 at 9:33 AM, Fabio Estevam <festevam at 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.

Regards,
Gary