"Could not find DRM device!" on VIM3L

quatro · November 27, 2019, 6:06am

I can’t run my application which uses EGLFS… it returns “Could not find DRM device!”

I could run it in EdgeV linux-4.4 with no problems, but it is not working on VIM3L linux-4.9 (the only option in fenix)

I need help with this asap.

Thanks! @numbqq

numbqq · November 27, 2019, 6:14am

Edge-V has X11 GPU and DRM support.

But for VIM3/VIM3L, there is X11 GPU support, only has fbdev, and there is no DRM support for current image.

quatro · December 3, 2019, 9:44am

Will it have DRM support in the next release?

numbqq · December 3, 2019, 9:51am

Maybe not. If you want to use DRM, you can refer this dts to add DRM support. But I’m not sure whether it works.

github.com

khadas/linux/blob/khadas-vims-4.9.y/arch/arm64/boot/dts/amlogic/g12a_s905d2_u200_drm_buildroot.dts

/*
 * arch/arm64/boot/dts/amlogic/g12a_s905d2_u200.dts
 *
 * Copyright (C) 2017 Amlogic, Inc. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 */

/dts-v1/;

#include "mesong12a.dtsi"

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uzosky · January 12, 2020, 9:14am

Is your app based on Qt 5?

quatro · January 12, 2020, 9:16am

yes, it is, I have tried to use that patch but with no success…

uzosky · January 12, 2020, 9:24am

My Qt 5 app was originally design to run on x86_64 SBC. I’m new to Arm based boards and need help with cross-compiling the app to my Edge-V.
any chance you could help with the steps involve with recompiling(porting)?
I have a Qt 5.12.6/Qt Creator 4.11 installed on Ubuntu 18.4 already.

quatro · January 12, 2020, 9:27am

First, try to compile natively using the Edge-V… you can transfer the source via scp or rsync, and then running qmake, make, etc… you need to install qt dependencies inside Edge-V. I still did not take time to do a cross compile yet…

uzosky · January 12, 2020, 9:33am

Ok, thanks.
By the way, if you still need help with the Egde-V custom boot logo, here is a helpful link by @recre8.