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lastFile:machines/anser/disable-scmi.dts

machines/anser/configuration.nix

@@ -7,4 +7,28 @@
   clan.core.settings.name = "anser";
   clan.core.settings.machine.description = "";
 
+  boot.loader.grub.enable = false;
+  boot.loader.generic-extlinux-compatible.enable = true;
+
+  hardware.enableRedistributableFirmware = true;
+
+  boot.kernelParams = [
+    "console=ttyS2,1500000n8"
+    "loglevel=4"
+  ];
+
+  hardware.deviceTree = {
+    enable = true;
+    filter = "*rk3566-radxa-zero-3*.dtb";
+    overlays = [
+      {
+        name = "disable-scmi";
+        dtsFile = ./disable-scmi.dts;
+      }
+      {
+        name = "enable-uart3";
+        dtsFile = ./enable-uart3.dts;
+      }
+    ];
+  };
 }

machines/anser/disable-scmi.dts

@@ -0,0 +1,20 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "radxa,zero-3w", "rockchip,rk3566";
+
+	fragment@0 {
+		target-path = "/firmware/scmi";
+		__overlay__ {
+			status = "disabled";
+		};
+	};
+
+	fragment@1 {
+		target-path = "/gpu@fde60000";
+		__overlay__ {
+			status = "disabled";
+		};
+	};
+};

machines/anser/enable-uart3.dts

@@ -0,0 +1,16 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "radxa,zero-3w", "rockchip,rk3566";
+
+	/* Enable UART3 on pins 3/5 (GPIO1_A0/A1) */
+	fragment@0 {
+		target = <&uart3>;
+		__overlay__ {
+			status = "okay";
+			pinctrl-names = "default";
+			pinctrl-0 = <&uart3m0_xfer>;
+		};
+	};
+};