We have made a custom board and we were able to download image to board(emmc and lpddr2 ram). If we use default Mfg tool zImage and zImage-imx6ul-14x14-evk-emmc.dtb the board successfully boots but if we use our own customised zImage and dtb file the board hangs while booting showing last message "waiting for root device /dev/mmcblk1p2". While same image was working fine with imx6 evk board(sdcard). I have attached the dts file I am using for my customised board(lpddr2 ram and emmc). Where I am making a mistake in my dts file which leads to board hang up while booting.
Original Attachment has been moved to: imx6ul-14x14-evk.dts.zip