u-boot/arch/riscv/dts/ae250.dts

/dts-v1/;
/ {
	compatible = "riscv32 nx25";
	#address-cells = <1>;
	#size-cells = <1>;
	interrupt-parent = <&intc>;

	aliases {
		uart0 = &serial0;
		ethernet0 = &mac0;
		spi0 = &spi;
	} ;

	chosen {
		bootargs = "console=ttyS0,38400n8 earlyprintk=uart8250-32bit,0xf0300000 debug loglevel=7";
		stdout-path = "uart0:38400n8";
		tick-timer = &timer0;
	};

	memory@0 {
		device_type = "memory";
		reg = <0x00000000 0x40000000>;
	};

	spiclk: virt_100mhz {
		#clock-cells = <0>;
		compatible = "fixed-clock";
		clock-frequency = <100000000>;
	};

	cpus {
		#address-cells = <1>;
		#size-cells = <0>;
		cpu@0 {
			compatible = "andestech,n13";
			reg = <0>;
			/* FIXME: to fill correct frqeuency */
			clock-frequency = <60000000>;
		};
	};

	intc: interrupt-controller {
		compatible = "andestech,atnointc010";
		#interrupt-cells = <1>;
		interrupt-controller;
	};

	serial0: serial@f0300000 {
		compatible = "andestech,uart16550", "ns16550a";
		reg = <0xf0300000 0x1000>;
		interrupts = <7 4>;
		clock-frequency = <19660800>;
		reg-shift = <2>;
		reg-offset = <32>;
		no-loopback-test = <1>;
	};

	timer0: timer@f0400000 {
		compatible = "andestech,atcpit100";
		reg = <0xf0400000 0x1000>;
		interrupts = <2 4>;
		clock-frequency = <40000000>;
	};

	mac0: mac@e0100000 {
		compatible = "andestech,atmac100";
		reg = <0xe0100000 0x1000>;
		interrupts = <25 4>;
	};

	mmc0: mmc@f0e00000 {
		compatible = "andestech,atsdc010";
		max-frequency = <100000000>;
		fifo-depth = <0x10>;
		reg = <0xf0e00000 0x1000>;
		interrupts = <17 4>;
		cap-sd-highspeed;
	};

	spi: spi@f0b00000 {
		compatible = "andestech,atcspi200";
		reg = <0xf0b00000 0x1000>;
		#address-cells = <1>;
		#size-cells = <0>;
		num-cs = <1>;
		clocks = <&spiclk>;
		interrupts = <3 4>;
			flash@0 {
			compatible = "spi-flash";
			spi-max-frequency = <50000000>;
			reg = <0>;
			spi-cpol;
			spi-cpha;
		};
	};

};