About Dual display on imx.6q

[zhiyancao]

My board has two display interface DISP0(ADV7123->VGA) and HDMI，I change the board init file:

static struct ipuv3_fb_platform_data sabresd_fb_data[] = {

  { /*fb0*/

  .disp_dev = "vga",

  .interface_pix_fmt = IPU_PIX_FMT_BGR24,

  .mode_str = "1440x900M@60",

  .default_bpp = 16,

  .int_clk = false,

  .late_init = false,

  }, {

  .disp_dev = "hdmi",

  .interface_pix_fmt = IPU_PIX_FMT_RGB24,

  .mode_str = "1024x768M@60",

  .default_bpp = 16,

  .int_clk = false,

  .late_init = false,

  },

};

I found the /dev exist 4 fb: fb0 fb1 fb2 fb3

According to my think, fb0 and fb1 is ok, fb0 is vga, fb1 is hdmi, but fb2 and fb3 is what?

uboot:

setenv video1 mxcfb1:dev=hdmi,1024x768M@60,if=RGB24

setenv video0 mxcfb0:dev=vga,1024x768M@60,if=RGB24

setenv bootargs video=${video0} video=${video1}

When set VGA to mxcfb0, or set HDMI to mxcfb0, the display is ok.

How to support the two displays at the same time?

[jotes]

Take a look at: http://boundarydevices.com/configuring-i-mx6-machines-different-screens-nitrogen6x-sabre-lite/. It may helps you.

"mxcfbN: This display specifier defines the ordering of display devices under Linux. Note that there is not a 1:1 correspondence with /dev/fbN because /dev/fb1 and /dev/fb3 will be automatically configured as overlay devices for /dev/fb0 and /dev/fb2."

[zhiyancao]

Thanks! It help me to solve some basic problem. Now I can operate on /dev/fb0 and /dev/fb2.