Linux/TDA2EXEVM: TDA2Ex: Virtual DRM interface to support Frame buffer abstract between M4 & A15

Hi Rajesh,

here is the Wiki page for VDRM user guide:
processors.wiki.ti.com/.../Virtual_DRM_:_An_User_Guide_for_Developing_Usecases

Also there is existing Usecase that uses VDRM - please check chapter "4.3.4 Linux DRM usecase" in VisionSDK_Linux_UserGuide.pdf

Regards,
Yordan

Hi Yordan,

Thanks for your reply.

Kindly help us to understand the flow from Linux(A15) to M4 by using VDRM !!!

Is it any document to refer ?

We are enabling VDRM in low level, Let you know if any queries we have !!!

Regards,

Rajesh Kannan S

Hi Rajesh,

I am not familiar how the flow in VDRM works. I have pinged graphics expert to provide further help.

Regards,
Yordan

Hi Yordan,

Thanks for your reply.

Waiting for graphics team to respond !!! Kindly suggest

Regards,

Rajesh Kannan S

Hi Yordan,

I have enabled VDRM support in kernel.

While seeing this log I'm getting the following ERROR !!

root@dra7xx-evm:/var/log# cat weston.log
Date: 2018-09-17 UTC
[09:22:49.863] weston 1.9.0
http://wayland.freedesktop.org
Bug reports to: bugs.freedesktop.org/enter_bug.cgi
Build: 1.8.93-2-gb05cdb8 configure.ac: bump to version 1.9.0 for the official release (2015-09-21 18:11:26 -0700)
[09:22:49.864] OS: Linux, 4.4.84-00027-g018eb62, #1 SMP PREEMPT Mon Nov 26 12:42:20 IST 2018, armv7l
[09:22:49.865] Using config file '/etc//weston.ini'
[09:22:49.867] Loading module '/usr/lib/weston/drm-backend.so'
[09:22:49.893] Output repaint window is 7 ms maximum.
[09:22:49.893] initializing drm backend
[09:22:49.894] using /dev/dri/card0
[09:22:49.896] Loading module '/usr/lib/weston/gl-renderer.so'
loaded module : gbm_pvr.so
found valid GBM backend : gbm_pvr.so
[09:22:50.014] failed to initialize egl
[09:22:50.014] fatal: failed to create compositor backend
PVR:(Error): [ 838-> 838] < gbm_pvr_create_device():645|ERROR> Failed to create DBM device: No such device [0, ]
root@dra7xx-evm:/var/log#

Regarding to create DBM device, I need to connect any display device or any configuration mismatch issue ?

Kindly check and suggest me to solve this issue !!!

Hi TI Experts,

Anybody can reply this issue !!!

I have connected HDMI display in HDMI OUT ???

Which DBM device is expecting to create ?

Kindly suggest me

Regards,

Rajesh Kannan S

Refer to the user guide here: processors.wiki.ti.com/.../Virtual_DRM_:_An_User_Guide_for_Developing_Usecases

Hi Subhajit,

As per your guidance I have enabled Virtual DRM.

I want to see the GUI Application output to HDMI display in SOC.

While running Qt application, expecting /dev/fb* which is not supported by VDRM.

Kindly suggest me which DRM based EGL to create the Frame buffer node /dev/fb* !!!

Regards,

Rajesh Kannan S

Can you check into your .config file in kernel build directory and verify that CONFIG_DRM_FBDEV_EMULATION is set?