I am trying to run the hellogl_es2 Qt example without X Server by specifying the eglfs platform:
> ./hellogl_es2 -platform eglfs
No protocol specified
Segmentation fault (core dumped)
CPU is Freescale i.MX6.
Linux kernel is 3.10.17.
Distribution is Ubuntu 14.04.4 LTS (trusty).
Qt version is 5.2.1, installed from http://packages.ubuntu.com, armhf architecture, packages qtbase5-dev, qtbase5-examples, qtbase5-examples-dbg.
The core dump is (problem at gcoOS_InitLocalDisplayInfo in libGAL.so):
GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
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Reading symbols from hellogl_es2...Reading symbols from /usr/lib/debug/.build-id/6f/8a8dfdb5abe920e37000a98092b4058b56da0a.debug...done.
done.
[New LWP 2802]
[New LWP 2803]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".
Core was generated by `./hellogl_es2 -platform eglfs'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0xb5dd0c84 in gcoOS_InitLocalDisplayInfo () from /usr/lib/arm-linux-gnueabihf/vivante/libGAL.so
(gdb) bt
#0 0xb5dd0c84 in gcoOS_InitLocalDisplayInfo () from /usr/lib/arm-linux-gnueabihf/vivante/libGAL.so
#1 0xb5d095f8 in ?? () from /usr/lib/arm-linux-gnueabihf/libEGL.so.1
/build/buildd/gdb-7.7.1/gdb/frame.c:472: internal-error: get_frame_id: Assertion `fi->this_id.p' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
The behavior is the same with other Qt example projects.
When the X Server is running, specifying the xcb platform (-platform xcb, i.e. the default) is working fine.
I managed to solve the "segmentation fault" problem with:
apt-get install gpu-viv-bin-mx6q-fb
(that automatically uninstalls gpu-viv-bin-mx6q-x11).
However, now I have another issue: "EGL Error : could not create the EGL surface: error 0x300b" on i.MX6 when running Qt5 application with -platform eglfs