Cubietruck Allwinner A20 VGA output on mainline Armbian

vga.dts

/dts-v1/;
/plugin/;

/* Based on https://github.com/wens/linux/commits/sun4i-drm-tve-vga-wip */
/* Tested with Cubetruck */
/* save it somewhere and run sudo armbian-add-overlay vga.dts */

/ {
	compatible = "allwinner,sun4i-a10", "allwinner,sun7i-a20", "allwinner,sun8i-h3", "allwinner,sun50i-a64", "allwinner,sun50i-h5";

	fragment@0 {
		target-path = "/soc";
		__overlay__ {
			tve0: tv-encoder@1c0a000 {
				compatible = "allwinner,sun4i-a10-tv-encoder";
				reg = <0x01c0a000 0x1000>;
				clocks = <&ccu 54>;  /* #define CLK_AHB_TVE0	54 */

				ports {
					#address-cells = <1>;
					#size-cells = <0>;

					port@0 {
						reg = <0>;

						tve0_in_tcon0: endpoint {
							remote-endpoint = <&tcon0_out_tve0>;
						};
					};

					tve0_out: port@1 {
						reg = <1>;
						#address-cells = <1>;
						#size-cells = <0>;
						/* endpoint number denotes the TVOUT on the SoC used */
						tve0_out_g: endpoint@0 {
							reg = <0>; /* TVOUT 0 */
							allwinner,tve-source = <4>; /* Y/G */
							remote-endpoint = <&vga_connector_in_g>;
						};

						tve0_out_b: endpoint@1 {
							reg = <1>; /* TVOUT 1 */
							allwinner,tve-source = <5>; /* U/Pb/B */
							remote-endpoint = <&vga_connector_in_b>;
						};

						tve0_out_r: endpoint@2 {
							reg = <2>; /* TVOUT 2 */
							allwinner,tve-source = <6>; /* V/Pr/R */
							remote-endpoint = <&vga_connector_in_r>;
						};
					};
				};
			};

		};
	};

	fragment@1 {
		target-path = "/soc/lcd-controller@1c0c000/ports/port@1";
		__overlay__ {
			tcon0_out_tve0: endpoint@2 {
				reg = <2>;
				remote-endpoint = <&tve0_in_tcon0>;
				allwinner,tcon-channel = <1>;
			};
		};
	};


	fragment@2 {
		target-path = "/";
		__overlay__ {
			vga-connector {
				compatible = "vga-connector";
				label = "vga";
				ddc-i2c-bus = <&i2c2>;

				port {
					#address-cells = <1>;
					#size-cells = <0>;

					vga_connector_in_r: endpoint@0 {
						reg = <0>;
						remote-endpoint = <&tve0_out_r>;
					};

					vga_connector_in_g: endpoint@1 {
						reg = <1>;
						remote-endpoint = <&tve0_out_g>;
					};

					vga_connector_in_b: endpoint@2 {
						reg = <2>;
						remote-endpoint = <&tve0_out_r>;
					};

					/* usage of tve0 implies h/v sync from tcon0 */
				};
			};
		};
	};
};

Its quite possible that device tree has changed and this overlay no longer works. I dont have access to the hardware to test it out.

To recover your Armbian install you have to mount your SD card and remove the vga overlay from the /boot folder. Or use uart serial console.

I've restored settings through SSH. No problem with that.
Can you tell me please, what version of Armbian have you used with this script?

It was probably Armbian 20.05 buster with 5.4 kernel, tho im not sure. The devicetree overlay itself is based on 5.2 kernel. There has been quite some activity around Display Engine driver in linux-sunxi mailinglist, probably thats why it no longer works.
(I should probably find some free time to fix it and push it to upstream as my first patch to linux kernel...)

Thank you, it would be great!