galcore module failed to load

Hi all,

Currently I'm using toradex_4.9-2.3.x-imx kernel for my Buildroot system and I plan to do some testing on the Vivante GPU using the examples provided by Freescale : 

But I've got errors for following tests :

1. root@imx-buildroot:~# /usr/share/examples/viv_samples/cl11/UnitTest/clinfo
3. >>>>>>>> /usr/share/examples/viv_samples/cl11/UnitTest/clinfo Starting...
6. !!! Error # -1001 at line 156 , in file main.cpp !!!
8. !!! Exiting...

1. root@imx-buildroot:~# /usr/share/examples/viv_samples/cl11/fft/fft 1024
2. Block size: 16
3. Print result: yes
4. Initializing device(s)...
5. ERROR:: -32 clCreateContextFromType failed

Also, I noticed that the gpu-viv's driver (i.e. galcore module was failed to load) :

1. root@imx-buildroot:~# dmesg | grep -i galcore
2. [ 2.766399] Galcore version 6.2.4.150331
3. [ 2.766630] galcore: probe of 130000.gpu failed with error -22

I'd like to know if this galcore.ko relates to the above tests and why did it fail to load, please ?

Thanks in advance,
Khang