Have a custom imx6D board. We are able to boot it using usb boot tool from boundary devices. When we place the u-boot in the 1k spot of the sd card (dd if=u-boot.imx of=/dev/sd? bs=1k seek=1) the board does nothing. I have the dip switches that the sabre SD board has and have them configured as 01000100. The console just remains blank. Can anyone help with this?