Galcore does not create a device

[MicMoba]

Hi,

I need some support around the GPU topic of the iMX8MP.

After I switched from Kernel 5.15.52 to Kernel 6.6.23 my LVDS display did not work as expect.

I recognized that the galcore kernel module did not create a device (/dev/galcore).

How can I found out why the device is not create? I tried to remove the module and insert again but this works without error messages. I searched in dmesg and journalctl but also with no success.

So what possibilities do I have to get more information? 

[MicMoba]

I checked the following things:

$ strings /usr/lib/libGAL.so | grep VERSION
  $VERSION$6.4.11:745085:bc7b6a2a0f$

$ strings /usr/lib/modules/6.6.23-v6.6.23-2.0.0-phy-ge2011246/updates/galcore.ko | grep VERSION
  $VERSION$6.4.11:745085$

$ldconfig -p | grep libGAL.so
  libGAL.so (libc6,AArch64) => /lib/libGAL.so

So the Galcore firmware (libGAL.so) and the kernel module (galcore.ko) have the same version. I can see the galcore with lsmod command.

I have a /dev/dri/card0 device but no /dev/galcore device

Which possibilities do I have to do further checks? How is the connection between LVDS and Galcore?

[Bio_TICFSL]

Hello,

You have galcore in your system and it's ready to use, you just need to send the graphics to lvds, make sure your display is lvds in uboot.

Regards

[MicMoba]

That's a point I will check.

You mean it is not necessary to have a device called /dev/galcore ? I thought this is mantandory for a iMX8 system with Vivante GPU.

This is a part of weston 12 output:

[12:26:48.568] libseat: session control granted
[12:26:48.571] using /dev/dri/card0
[12:26:48.571] DRM: supports atomic modesetting
[12:26:48.571] DRM: does not support GBM modifiers
[12:26:48.571] DRM: does not support async page flipping
[12:26:48.571] DRM: supports picture aspect ratio
[12:26:48.571] Loading module '/usr/lib/libweston-12/gl-renderer.so'
[     1] Failed to open device: No such file or directory, Try again...
[     2] Failed to open device: No such file or directory, Try again...
[     3] Failed to open device: No such file or directory, Try again...
[     4] Failed to open device: No such file or directory, Try again...
[     5] _OpenDevice(1031): FATAL: Failed to open device, errno=No such file or directory.
[     6] Failed to open device: No such file or directory, Try again...
[     7] Failed to open device: No such file or directory, Try again...
[     8] Failed to open device: No such file or directory, Try again...
[     9] Failed to open device: No such file or directory, Try again...
[    10] _OpenDevice(1031): FATAL: Failed to open device, errno=No such file or directory.
[12:26:56.585] [seatd/client.c:471] Client disconnected

I thought the "Failed to open device" messages were from a missing /dev/galcore device. How can I get more information about the missing file or directory?

[MicMoba · Accepted solution]

Hi I found out that I miss to enable the mix_gpu_ml node in the devicetree.

After I add the lines

&mix_gpu_ml {
	status = "okay";
};

and reboot I have a /dev/galcore device. And now I am also able to start weston

[mgordon]

I'm seeing the same issue with 5.4. galcore driver is loaded, but no /dev/galcore device.  Nothing in either dmesg or journalctl. Any suggestions?

[Bio_TICFSL]

Hello,

Send us you dmesg log file is not possible not building the galcore in 6.6.23.

regards

[MicMoba]

Can you tell me how the procedure with the vivante galcore firmare is?

The firmware is a binary blob. The kernel module loads the firmware and initialize the GPU. Is the firmware part of the kernel module (galcore.ko) or should there a .bin file in the /lib/firmware folder which is load?

[MicMoba]

Hi,

you will find the dmesg output in the attachment