dts enable uart

build/boards/cv180x/cv1800b_milkv_duo_sd/dts_riscv/cv1800b_milkv_duo_sd.dts

@@ -16,6 +16,18 @@
 	};
 };
 
+&uart1 {
+	status = "okay";
+};
+
+&uart2 {
+	status = "okay";
+};
+
+&uart3 {
+	status = "okay";
+};
+
 &uart4 {
 	status = "okay";
 };

build/boards/cv181x/cv1812cp_milkv_duo256m_sd/dts_riscv/cv1812cp_milkv_duo256m_sd.dts

@@ -30,6 +30,18 @@
 	status = "disabled";
 };
 
+&uart1 {
+	status = "okay";
+};
+
+&uart2 {
+	status = "okay";
+};
+
+&uart3 {
+	status = "okay";
+};
+
 / {
 	model = "Milk-V Duo256M";
 };

build/boards/cv181x/cv1813h_milkv_duos_emmc/dts_riscv/cv1813h_milkv_duos_emmc.dts

@@ -69,6 +69,18 @@
 	wakeup-gpio = <&porte 7 GPIO_ACTIVE_HIGH>;
 };
 
+&uart1 {
+	status = "okay";
+};
+
+&uart2 {
+	status = "okay";
+};
+
+&uart3 {
+	status = "okay";
+};
+
 &uart4 {
 	status = "okay";
 };

build/boards/cv181x/cv1813h_milkv_duos_sd/dts_riscv/cv1813h_milkv_duos_sd.dts

@@ -69,6 +69,18 @@
 	wakeup-gpio = <&porte 7 GPIO_ACTIVE_HIGH>;
 };
 
+&uart1 {
+	status = "okay";
+};
+
+&uart2 {
+	status = "okay";
+};
+
+&uart3 {
+	status = "okay";
+};
+
 &uart4 {
 	status = "okay";
 };