Qt5.4 + EGLFS on BeagBone Black

titan83

Hello.
I successful build kernel + SGX drivers + Qt5.4.2.
But I have one problem: my programs starts only from root user. In this case all work properly (HDMI ot cape output, usb mouse or touch input).
But when I tried to start from not root, I have next messages:
lims@arm:~$ ./eInst
Could not initialize egl display
Aborted
user lims in video group, can write to /dev/fb0.

when I'm trying to start using linuxfb - it works:
lims@arm:~$ ./eInst -platform linuxfb
"Settings: settings file/home/lims/eInst.confwas empty."

What can I do to solve this problem?

Thanks.

julio.cruz

Hi,
Here, I have the same problem with another custom ARM board.
Appreciate any advice,
JC

julio.cruz

Hi,

After digging the issue, the cause was related with permission in folder /dev/galcore (in my case, galcore is the Vivante GPU driver).
To test the solution, you could change the owner of the folder as below:

sudo chown -R username:group /dev/galcore

To obtain the root cause, you could perform the following test:

strace yourapp -platform eglfs
...
open("/dev/galcore", O_RDWR)            = -1 EACCES (Permission denied)
open("/dev/graphics/galcore", O_RDWR)   = -1 ENOENT (No such file or directory)
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0xd4} ---
+++ killed by SIGSEGV +++
Segmentation fault

Julio