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Cloning a display

Question asked by Steven Borley on Jan 15, 2014
Latest reply on Jan 15, 2014 by Eric Nelson

I currently have two displays (both 800x600) on on the LDVS and one on the LCD interface (two 'video=' parameters in bootargs). Under Linux (3.0.55 kernel) I can independently stream video to one and run my QT app in the other.  However, I now need to clone the main display instead - so that the screen showing the App is cloned to the other display (ie. both screens showing the same image). I don't understand how to do this.

 

I've seen some mention of bootargs for doing this but the few examples I've found don't work on an i.MX6 (or I don't understand how to adapt them). Is there a guide for the parameters to pass for the video? I've not yet found one that's relevant to the i.MX6

 

My current bootargs for this are (LDB_SVGA is a custom fb_videomode in the kernel that is 800x600):

 

bootargs= .... video=mxcfb0:dev=ldb,LDB_SVGA,if=RGB666,bpp=16 video=mxcfb1:dev=lcd,800x600M@60

 

To get display cloning do I need to modify the bootargs or is there another way?

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