u-boot/arch/arm/dts/imx7s-warp-u-boot.dtsi

/ {
    aliases {
        mmc0 = &usdhc3;
        usb0 = &usbotg1;
    };

    chosen {
        stdout-path = &uart1;
    };
};

&aips3 {
	bootph-all;
};

&pinctrl_uart1 {
	bootph-all;
};

&soc {
	bootph-all;
};

&uart1 {
	bootph-all;
};