Basic board setup

boards/other/pico_stm32/Kconfig.pico_stm32

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+config BOARD_PICO_STM32
+       select SOC_STM32F103X8

boards/other/pico_stm32/board.cmake

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+board_runner_args(pyocd "--target=stm32f103c8")
+
+include(${ZEPHYR_BASE}/boards/common/pyocd.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/openocd-stm32.board.cmake)

boards/other/pico_stm32/board.yml

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+board:
+  name: pico_stm32
+  full_name: Pico STM32
+  vendor: other
+  # stm32f103c8t6
+  socs:
+    - name: stm32f103xb

boards/other/pico_stm32/pico_stm32.dts

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+/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"; */
+/* 	}; */
+/* }; */

boards/other/pico_stm32/pico_stm32.yaml

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+identifier: pico_stm32
+name: Pico STM32
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+ram: 20
+flash: 128
+supported:
+  - gpio
+  - spi
+  - pwm
+  - watchdog
+  - adc
+  - dma
+  - nvs
+  - counter
+vendor: other

boards/other/pico_stm32/pico_stm32_defconfig

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+# enable uart driver
+CONFIG_SERIAL=y
+# enable console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+# enable GPIO
+CONFIG_GPIO=y
+
+# USB console
+#CONFIG_USB_DEVICE_STACK=y
+#CONFIG_USB_CDC_ACM=y
+#CONFIG_USB_DEVICE_INITIALIZE_AT_BOOT=y

boards/other/pico_stm32/support/openocd.cfg

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+source [find interface/cmsis-dap.cfg]
+transport select swd
+
+source [find target/stm32f1x.cfg]