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By default the HDP-TTJ-500 will be configured to use the HDMI display connector on the board.  However, if you have previously modified bootargs to use a different display output then you can restore the HDMI output by following this guide.

Step-by-step guide


  1. Attach a USB serial cable to the board and use your favourite terminal application to communicate with HDP-TTJ-500.
  2. Attach an HDMI monitor to the HDP-TTJ-500.
  3. Interrupt the u-boot sequence before it counts down to zero by pressing any key.
  4. At the command prompt enter the following commands:

    U-Boot > setenv mmcargs 'setenv bootargs console=${console},${baudrate} ${smp} root=${mmcroot} video=mxcfb0:dev=hdmi,1280x720M@60,if=RGB24 quiet'
    U-Boot > saveenv
    Saving Environment to MMC...
    Writing to MMC(2)... done
    U-Boot > boot

U-Boot should now boot into Yocto Linux and the graphical window manager should be output to your HDMI monitor.

HDMI output corruption


There is a known bug in the HDMI driver which causes display corruption if an HDMI monitor is either disconnected and reconnected or powered down and back up during operation.