Basic board setup

boards/other/pico_stm32/pico_stm32.dts

@@ -0,0 +1,76 @@
+/dts-v1/;
+
+#include <st/f1/stm32f103X8.dtsi>
+#include <st/f1/stm32f103c(8-b)tx-pinctrl.dtsi>
+
+/ {
+        model = "Pico STM32 board";
+        compatible = "other,pico-stm32";
+
+        chosen {
+                zephyr,console = &usart1;
+		zephyr,shell-uart = &usart1;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	leds: leds {
+		compatible = "gpio-leds";
+
+		green_led: led_2 {
+			gpios = <&gpioa 8 GPIO_ACTIVE_HIGH>;
+			label = "PA8";
+		};
+	};
+
+	aliases {
+		led0 = &green_led;
+		die-temp0 = &die_temp;
+	};
+};
+
+&clk_lsi {
+	status = "okay";
+};
+
+&clk_hse {
+	clock-frequency = <DT_FREQ_M(16)>; /* 16 MHz quartz */
+	status = "okay";
+};
+
+&pll {
+	mul = <9>;
+	clocks = <&clk_hse>;
+        xtpre;
+	status = "okay";
+};
+
+&rcc {
+	clocks = <&pll>;
+	clock-frequency = <DT_FREQ_M(72)>;
+	ahb-prescaler = <1>;
+	apb1-prescaler = <2>;
+	apb2-prescaler = <1>;
+	adc-prescaler = <2>;
+};
+
+&usart1 {
+	pinctrl-0 = <&usart1_tx_pa9 &usart1_rx_pa10>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&die_temp {
+	status = "okay";
+};
+
+/* zephyr_udc0: &usb { */
+/*         pinctrl-0 = <&usb_dm_pa11 &usb_dp_pa12>; */
+/*         pinctrl-names = "default"; */
+/*         status = "okay"; */
+
+/*         cdc_acm_uart0: cdc_acm_uart0 { */
+/* 		compatible = "zephyr,cdc-acm-uart"; */
+/* 	}; */
+/* }; */