i.mx6 Yocto Clone Display /dev/fb0 to /dev/fb2

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i.mx6 Yocto Clone Display /dev/fb0 to /dev/fb2

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matthiasalbrech
Contributor III

Hi,

I use I.mx6 with yocto and try to clone/mirror my Display. I have an internal lvds Display and an USB-DVI Adapter (DisplayLink). The Displaylink driver works and after plug it in /dev/fb2 appears. Its possible to copy data in fb2 and it appears on the display. But I want to mirror my lvds screen.

First I tried it with Xorg and for the first test I copied in .conf:

Section "Device"
Identifier "i.MX Accelerated Framebuffer Device-0"
Driver "fbdev"
Option "fbdev" "/dev/fb0"
Option "vivante_fbdev" "/dev/fb0"
Option "HWcursor" "false"
EndSection

Section "Device"
Identifier "i.MX Accelerated Framebuffer Device-1"
Driver "fbdev"
Option "fbdev" "/dev/fb2"
Option "vivante_fbdev" "/dev/fb2"
Option "HWcursor" "false"
Option "NoAccel" "True"
EndSection

Section "Monitor"
Identifier "Monitor0"
EndSection

Section "Monitor"
Identifier "Monitor1"
EndSection

Section "Screen"
Identifier "Scr0"
Monitor "Monitor0"
Device "i.MX Accelerated Framebuffer Device-0"
EndSection

Section "Screen"
Identifier "Scr1"
Monitor "Monitor1"
Device "i.MX Accelerated Framebuffer Device-1"
EndSection

Section "ServerFlags"
Option "Xinerama" "true"
EndSection

Section "ServerLayout"
Identifier "Default Layout"
Screen "Scr0" 0 0
Screen "Scr1" RightOf "Scr0"
EndSection

============

With that configuration I can expand the display. But I need the vivante driver, not fbdev (as I know, vivante doesn't support dual display mode?). And its not possible to clone the display when I change the ServerLayout. So my thought was to develop a small program to copy fb0 to fb2. Are there any solutions how to do that? Or do you have any completely different idea how to clone the display?

thanks,

Matthias

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matthiasalbrech
Contributor III

Hi,

thanks. But it doesn't work. I read that in xorg.conf I have to use vivante for one framebuffer and for the other fbdev (it seems that "vivante" not support two display? :i.mx6q Enable Dual Display of Ubuntu ). But that doesn't work for me.

I would like it to copy one framebuffer to the other (/dev/fb0 to /dev/fb2). But if I do a simple "cat /dev/fb0 > /dev/fb2" (or use my efficient c-code with mmap) the display shows a strange picture (see attachment). Do you know why it shows something like that? Or do you where I can get informations about that?

800x480display.JPG1280x1024display.JPG

thanks,

Matthias

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Matthias

one can look at suggestions provided on

i.mx6q Enable Dual Display of Ubuntu 

Cloning a display 

Best regards
igor
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