[Solved] Qt 5.4 on Beaglebone black with OpenGL EGLES2: Linux is dead after execute example application. No response from keyboard and mouse.

hammerlei

Hello everyone

I'm new on Qt on arm linux. I'm trying to cross compile the newest version Qt 5.4 for Beaglebone Black(BBB). I think I almost successed because I finished configure and make of Qt 5.4 based on root file system on BBB. When I try to run an example, the GUI shows up but the linux is dead and there is no response from keyboard and mouse. The only thing I can do is to reset BBB. Could someone help me with this problem? I will describe my steps as follow:

Build Ubuntu SD card

For this step, I followed the following website:
https://eewiki.net/display/linuxonarm/BeagleBone+Black

Kernel version:
Linux arm 3.18.0-bone1 #1 Mon Dec 8 23:08:59 EST 2014 armv71 armv71 armv71 GNU/Linux

Root file system:
Ubuntu 14.04.1 LTS

Cross compiler:
arm-linux-gnueabihf-gcc (crosstool-NG linaro-1.13.1-4.9-2014.09 - Linaro GCC 4.9-2014.09) 4.9.2 20140904 (prerelease)

The SD card just works fine.

Build and install SGX driver
Also, I followed the SGX part of the following website
https://eewiki.net/display/linuxonarm/BeagleBone+Black

The demo program OGLES2ChameleonMan works fine.

Build Qt 5.4
(1) Download Qt 5.4 source qt-everywhere-opensource-src-5.4.0.tar.gz
http://download.qt-project.org/archive/qt/5.4/5.4.0/single/

(2) Configure Qt 5.4
copy the newest cross compiler library to root file system (otherwise the configure has errors)
@sudo cp -r <some dir>/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/arm-linux-gnueabihf/libc/* <some dir>/rootfs@

edit /qtbase/mkspecs/devices/linux-beaglebone-g++/qmake.conf
@Ln 29: COMPILER_FLAGS = -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=hard
Ln 39: QMAKE_INCDIR_EGL = $$[QT_SYSROOT]/usr/include/OGLES2@

configure
@sudo ./configure -prefix /home/ubuntu/Qt -device linux-beaglebone-g++ -device-option CROSS_COMPILE=/home/albert/arm-dev/kernel_dev/bb-kernel/dl/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/bin/arm-linux-gnueabihf- -sysroot /media/albert/rootfs -release -opensource -confirm-license -opengl es2 -v@

configure result
@ Configure summary

Building on: linux-g++ (x86_64, CPU features: mmx sse sse2)
Building for: devices/linux-beaglebone-g++ (arm, CPU features: neon)
Platform notes:

        - Also available for Linux: linux-kcc linux-icc linux-cxx

qmake vars .......... styles += mac fusion windows DEFINES += QT_NO_MTDEV DEFINES += QT_NO_LIBUDEV QMAKE_X11_PREFIX = /usr sql-drivers = sql-plugins = sqlite qmake switches .........

Build options:
Build parts ............ libs examples
Mode ................... release
Using C++11 ............ yes
Using gold linker....... yes
Using PCH .............. yes
Target compiler supports:
Neon ................. yes

Qt modules and options:
Qt D-Bus ............... runtime
Qt Concurrent .......... yes
Qt GUI ................. yes
Qt Widgets ............. yes
Large File ............. yes
QML debugging .......... yes
Use system proxies ..... no

Support enabled for:
Accessibility .......... yes
ALSA ................... no
CUPS ................... no
Evdev .................. yes
FontConfig ............. no
FreeType ............... yes (bundled copy)
Glib ................... no
GTK theme .............. no
HarfBuzz ............... yes (bundled copy)
Iconv .................. yes
ICU .................... no
Image formats:
GIF .................. yes (plugin, using bundled copy)
JPEG ................. yes (plugin, using bundled copy)
PNG .................. yes (in QtGui, using bundled copy)
journald ............... no
mtdev .................. no
Networking:
getaddrinfo .......... yes
getifaddrs ........... yes
IPv6 ifname .......... yes
OpenSSL .............. no
NIS .................... yes
OpenGL / OpenVG:
EGL .................. yes
OpenGL ............... yes (OpenGL ES 2.0+)
OpenVG ............... no
PCRE ................... yes (bundled copy)
pkg-config ............. no
PulseAudio ............. no
QPA backends:
DirectFB ............. no
EGLFS ................ yes
KMS .................. no
LinuxFB .............. yes
XCB .................. no
Session management ..... yes
SQL drivers:
DB2 .................. no
InterBase ............ no
MySQL ................ no
OCI .................. no
ODBC ................. no
PostgreSQL ........... no
SQLite 2 ............. no
SQLite ............... yes (plugin, using bundled copy)
TDS .................. no
udev ................... no
xkbcommon .............. no
zlib ................... yes (bundled copy)

@

make and make install just work fine.

Run Qt examples
Before run Qt examples, again, I need to copy some cross compiler's lib file into SD card, otherwise it has errors when execute program.
@sudo cp -r <some dir>/gcc-linaro-arm-linux-gnueabihf-4.9-2014.09_linux/arm-linux-gnueabihf/lib <some dir>/rootfs/home/ubuntu@

On BBB, I neet to export LD_LIBRARY_PATH
@export LD_LIBRARY_PATH=/rootfs/home/ubuntu/lib@

Now, I can run Qt examples
@cd /Qt/examples/quick/demos/stocqt
./stocqt@

At this moment, the GUI shows on the screen. However, there is no mouse cursor and the keyboard doesn't response. I can still see the terminal's text cursor flashing. The only thing I can do now is to reset BBB. I also tried several other examples and all yield the same result. No mouse cursor and keyboard response.

Does any one know what should I do to fix this problem? Thanks!

SGaist

Hi,

IIRC, you need to also tell which input plugin you want to use e.g. -plugin evdevkeyboard

hammerlei

Thanks for the response. I tried
@./stocqt -plugin evdevkeyboard@
It doesn't work either.

SGaist

You should start your application with QT_DEBUG_PLUGINS=1 to see what happens with them

hammerlei

Thank you for respond, again.

I solved this problem, now. It is because the Qt program doesn't have the read permission to the /dev/input/eventX. I tried to run program with sudo and the mouse and keyboard work.

Also, I tried other solution.
I created /etc/udev/rules.d/99-input.rules with following content:
@KERNEL=="event*", NAME="input/%k", MODE="664", GROUP="input"@
Then, I rebooted BBB and all the events have read permissions. The qt example programs works.

Thanks!

SGaist

You can also add you user to the input group which should be more secure.

Since you have it working now, please update the thread title prepending [solved] so other forum users may know a solution has been found :)

Bremenpl

Hello there, sorry for diging this up. But i have the exact same problem.@hammerlei 's solution havent worked for me, could you please tell me what is the way of adding root to input group?

Laksono

@hammerlei how u run it in beaglebone black? "The demo program OGLES2ChameleonMan works fine."