Initial basic work on nice!nano board support.

app/boards/arm/nice_nano/Kconfig.board

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+# nice!nano board configuration
+
+# Copyright (c) 2020 Pete Johanson
+# SPDX-License-Identifier: MIT
+
+config BOARD_NICE_NANO
+	bool "nice!nano"
+	depends on SOC_NRF52840_QIAA

app/boards/arm/nice_nano/Kconfig.defconfig

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+# Electronut Labs Papyr board configuration
+
+# Copyright (c) 2018 Electronut Labs
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_NICE_NANO
+
+config BOARD
+	default "nice_nano"
+
+if USB
+
+config USB_NRFX
+	default y
+
+config USB_DEVICE_STACK
+	default y
+
+endif # USB
+
+config IEEE802154_NRF5
+	default y
+	depends on IEEE802154
+
+config BT_CTLR
+	default BT
+
+endif # BOARD_NICE_NANO

app/boards/arm/nice_nano/arduino_pro_micro_pins.dtsi

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+/*
+ * Copyright (c) 2020 Pete Johanson
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/ {
+	pro_micro_pins: connector {
+		compatible = "arduino-pro-micro";
+		#gpio-cells = <2>;
+		gpio-map-mask = <0xffffffff 0xffffffc0>;
+		gpio-map-pass-thru = <0 0x3f>;
+		gpio-map =
+			<1 0 &gpio0 6 0>,	/* D1 */
+			<0 0 &gpio0 8 0>,	/* D0 */
+			<2 0 &gpio0 17 0>,	/* D2 */
+			<3 0 &gpio0 20 0>,	/* D3 */
+			<4 0 &gpio0 22 0>,	/* D4/A6 */
+			<5 0 &gpio0 24 0>,	/* D5 */
+			<6 0 &gpio1 0 0>,	/* D6/A7 */
+			<7 0 &gpio0 11 0>,	/* D7 */
+			<8 0 &gpio1 4 0>,	/* D8/A8 */
+			<9 0 &gpio1 6 0>,	/* D9/A9 */
+			<10 0 &gpio0 9 0>,	/* D10/A10 */
+			<16 0 &gpio0 10 0>,	/* D16 */
+			<14 0 &gpio1 11 0>,	/* D14 */
+			<15 0 &gpio1 13 0>,	/* D15 */
+			<18 0 &gpio1 15 0>,	/* A0 */
+			<19 0 &gpio0 2 0>,	/* A1 */
+			<20 0 &gpio0 29 0>,	/* A2 */
+			<21 0 &gpio0 31 0>;	/* A3 */
+	};
+};
+
+pro_micro_i2c: &i2c1 {};
+pro_micro_spi: &spi1 {};
+pro_micro_serial: &uart1 {};

app/boards/arm/nice_nano/board.cmake

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+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(nrfjprog "--nrf-family=NRF52" "--softreset")
+include(${ZEPHYR_BASE}/boards/common/blackmagicprobe.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/nrfjprog.board.cmake)

app/boards/arm/nice_nano/nice_nano.dts

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+/*
+ * Copyright (c) 2020 Pete Johanson
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/dts-v1/;
+#include <nordic/nrf52840_qiaa.dtsi>
+#include "arduino_pro_micro_pins.dtsi"
+
+/ {
+	model = "nice!nano";
+
+	chosen {
+		zephyr,code-partition = &code_partition;
+		//zephyr,bt-mon-uart = &uart0;
+		//zephyr,bt-c2h-uart = &uart0;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		blue_led: led_0 {
+			gpios = <&gpio0 15 GPIO_ACTIVE_LOW>;
+			label = "Blue LED";
+		};
+	};
+
+};
+
+&gpio0 {
+	status = "okay";
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&uart0 {
+	compatible = "nordic,nrf-uart";
+	current-speed = <115200>;
+	tx-pin = <6>;
+	rx-pin = <8>;
+};
+
+&i2c0 {
+	compatible = "nordic,nrf-twi";
+	sda-pin = <17>;
+	scl-pin = <20>;
+};
+
+&flash0 {
+	/*
+	 * For more information, see:
+	 * http://docs.zephyrproject.org/latest/devices/dts/flash_partitions.html
+	 */
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		boot_partition: partition@0 {
+			label = "adafruit_boot";
+			reg = <0x000000000 0x0000C000>;
+		};
+		code_partition: partition@26000 {
+			label = "code_partition";
+			reg = <0x00026000 0x0001e000>;
+		};
+
+		/*
+		 * The flash starting at 0x000f8000 and ending at
+		 * 0x000fffff is reserved for use by the application.
+		 */
+
+		/*
+		 * Storage partition will be used by FCB/LittleFS/NVS
+		 * if enabled.
+		 */
+		storage_partition: partition@f8000 {
+			label = "storage";
+			reg = <0x000f8000 0x00008000>;
+		};
+	};
+};
+

app/boards/arm/nice_nano/nice_nano.yaml

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+identifier: nice_nano
+name: nice!nano
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+supported:
+  - adc
+  - usb_device
+  - ble
+  - ieee802154
+  - pwm
+  - watchdog

app/boards/arm/nice_nano/nice_nano_defconfig

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+# SPDX-License-Identifier: MIT
+
+CONFIG_SOC_SERIES_NRF52X=y
+CONFIG_SOC_NRF52840_QIAA=y
+CONFIG_BOARD_NICE_NANO=y
+
+# Enable MPU
+CONFIG_ARM_MPU=y
+
+# enable GPIO
+CONFIG_GPIO=y
+
+CONFIG_USE_DT_CODE_PARTITION=y