I am using the IMX6Q-SD board. I loaded the pre-made android kit kat imgs using the MFGTool. The OS appears to be running, but I'm not getting an image from the HDMI output. The documentation says to use UBoot to choose HDMI out as the default but does not explain how to get to the UBoot prompt. Can someone give me detailed steps of how to accomplish this with UBoot. I have not used UBoot before.