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[nrf fromlist] boards: Add nRF52840 dongle bare variant
Add a variant for builds that use debugger to flash the dongle, effectively overwriting the stock nRF5 SDK bootloader. Upstream PR #: 92405 Signed-off-by: Tomasz Chyrowicz <[email protected]>
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‎boards/nordic/nrf52840dongle/Kconfig‎

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@@ -8,6 +8,7 @@ if BOARD_NRF52840DONGLE
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config BOARD_HAS_NRF5_BOOTLOADER
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bool "Board has nRF5 bootloader"
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default y
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depends on !BOARD_NRF52840DONGLE_NRF52840_BARE
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help
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If selected, applications are linked so that they can be loaded by Nordic
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nRF5 bootloader.

‎boards/nordic/nrf52840dongle/Kconfig.defconfig‎

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# To let the nRF5 bootloader load an application, the application
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# must be linked after Nordic MBR, that is factory-programmed on the board.
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# Nordic nRF5 bootloader exists outside of the partitions specified in the
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# DTS file, so we manually override FLASH_LOAD_OFFSET to link the application
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# correctly, after Nordic MBR.
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# When building MCUBoot, MCUBoot itself will select USE_DT_CODE_PARTITION
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# which will make it link into the correct partition specified in DTS file,
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# the offset is applied here so that the full partition size can be used when
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# the bootloader Kconfig option has been disabled.
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# If the application wants to use the full partition size, a "bare" board
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# variant should be used instead.
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config FLASH_LOAD_OFFSET
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default 0x1000
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depends on BOARD_HAS_NRF5_BOOTLOADER && (MCUBOOT || !USE_DT_CODE_PARTITION)
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depends on BOARD_HAS_NRF5_BOOTLOADER && !USE_DT_CODE_PARTITION
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source "boards/common/usb/Kconfig.cdc_acm_serial.defconfig"
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‎boards/nordic/nrf52840dongle/board.yml‎

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vendor: nordic
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socs:
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- name: nrf52840
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variants:
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- name: bare

‎boards/nordic/nrf52840dongle/fstab-stock.dtsi‎

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#address-cells = <1>;
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#size-cells = <1>;
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/* MCUboot placed after Nordic MBR (this is set with the FLASH_LOAD_OFFSET
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* Kconfig value when BOARD_HAS_NRF5_BOOTLOADER is enabled), otherwise MCUboot
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* will be placed at 0x0. The size of this partition ensures that MCUBoot can
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/* MCUboot placed after Nordic MBR.
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* The size of this partition ensures that MCUBoot can
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* be built with CDC ACM support and w/o optimizations.
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*/
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boot_partition: partition@0 {
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boot_partition: partition@1000 {
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label = "mcuboot";
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reg = <0x00000000 0x00010000>;
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reg = <0x00001000 0x0000f000>;
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};
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slot0_partition: partition@10000 {

‎boards/nordic/nrf52840dongle/nrf52840dongle_nrf52840_bare.dts‎

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/*
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* Copyright (c) 2018-2023 Nordic Semiconductor ASA
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* Copyright (c) 2017 Linaro Limited
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/dts-v1/;
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#include <nordic/nrf52840_qiaa.dtsi>
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#include "nrf52840dongle_nrf52840-pinctrl.dtsi"
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#include <zephyr/dt-bindings/input/input-event-codes.h>
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/ {
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model = "Nordic nRF52840 Dongle NRF52840";
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compatible = "nordic,nrf52840-dongle-nrf52840";
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chosen {
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zephyr,sram = &sram0;
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zephyr,flash = &flash0;
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zephyr,code-partition = &slot0_partition;
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zephyr,ieee802154 = &ieee802154;
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};
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leds {
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compatible = "gpio-leds";
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led0_green: led_0 {
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gpios = <&gpio0 6 GPIO_ACTIVE_LOW>;
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label = "Green LED 0";
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};
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led1_red: led_1 {
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gpios = <&gpio0 8 GPIO_ACTIVE_LOW>;
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label = "Red LED 1";
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};
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led1_green: led_2 {
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gpios = <&gpio1 9 GPIO_ACTIVE_LOW>;
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label = "Green LED 1";
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};
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led1_blue: led_3 {
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gpios = <&gpio0 12 GPIO_ACTIVE_LOW>;
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label = "Blue LED 1";
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};
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};
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pwmleds {
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compatible = "pwm-leds";
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red_pwm_led: pwm_led_0 {
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pwms = <&pwm0 0 PWM_MSEC(20) PWM_POLARITY_INVERTED>;
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};
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green_pwm_led: pwm_led_1 {
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pwms = <&pwm0 1 PWM_MSEC(20) PWM_POLARITY_INVERTED>;
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};
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blue_pwm_led: pwm_led_2 {
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pwms = <&pwm0 2 PWM_MSEC(20) PWM_POLARITY_INVERTED>;
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};
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};
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buttons {
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compatible = "gpio-keys";
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button0: button_0 {
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gpios = <&gpio1 6 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
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label = "Push button switch 0";
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zephyr,code = <INPUT_KEY_0>;
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};
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};
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/* These aliases are provided for compatibility with samples */
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aliases {
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sw0 = &button0;
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led0 = &led0_green;
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led1 = &led1_red;
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led2 = &led1_green;
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led3 = &led1_blue;
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led0-green = &led0_green;
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led1-red = &led1_red;
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led1-green = &led1_green;
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led1-blue = &led1_blue;
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pwm-led0 = &red_pwm_led;
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pwm-led1 = &green_pwm_led;
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pwm-led2 = &blue_pwm_led;
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red-pwm-led = &red_pwm_led;
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green-pwm-led = &green_pwm_led;
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blue-pwm-led = &blue_pwm_led;
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mcuboot-button0 = &button0;
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mcuboot-led0 = &led0_green;
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watchdog0 = &wdt0;
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};
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};
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&reg0 {
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status = "okay";
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};
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&reg1 {
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regulator-initial-mode = <NRF5X_REG_MODE_DCDC>;
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};
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&adc {
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status = "okay";
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};
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&gpiote {
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status = "okay";
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};
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&uicr {
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nfct-pins-as-gpios;
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gpio-as-nreset;
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};
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&gpio0 {
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status = "okay";
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};
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&gpio1 {
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status = "okay";
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};
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&uart0 {
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compatible = "nordic,nrf-uarte";
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status = "okay";
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current-speed = <115200>;
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pinctrl-0 = <&uart0_default>;
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pinctrl-1 = <&uart0_sleep>;
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pinctrl-names = "default", "sleep";
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};
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&i2c0 {
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compatible = "nordic,nrf-twi";
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status = "okay";
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pinctrl-0 = <&i2c0_default>;
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pinctrl-1 = <&i2c0_sleep>;
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pinctrl-names = "default", "sleep";
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};
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&i2c1 {
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compatible = "nordic,nrf-twi";
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/* Cannot be used together with spi1. */
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/* status = "okay"; */
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pinctrl-0 = <&i2c1_default>;
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pinctrl-1 = <&i2c1_sleep>;
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pinctrl-names = "default", "sleep";
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};
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&pwm0 {
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status = "okay";
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pinctrl-0 = <&pwm0_default>;
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pinctrl-1 = <&pwm0_sleep>;
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pinctrl-names = "default", "sleep";
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};
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/*
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* By default, not adding all available SPI instances (spi2, spi3) due to
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* limited GPIOs available on dongle board.
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*/
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&spi0 {
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compatible = "nordic,nrf-spi";
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/* Cannot be used together with i2c0. */
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/* status = "okay"; */
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pinctrl-0 = <&spi0_default>;
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pinctrl-1 = <&spi0_sleep>;
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pinctrl-names = "default", "sleep";
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};
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&spi1 {
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compatible = "nordic,nrf-spi";
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status = "okay";
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pinctrl-0 = <&spi1_default>;
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pinctrl-1 = <&spi1_sleep>;
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pinctrl-names = "default", "sleep";
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};
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&ieee802154 {
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status = "okay";
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};
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/* Include flash partition table.
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* Two partition tables are available:
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* fstab-stock -compatible with Nordic nRF5 bootloader, default
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* fstab-debugger -to use an external debugger, w/o the nRF5 bootloader
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*/
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#include "fstab-debugger.dtsi"
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zephyr_udc0: &usbd {
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compatible = "nordic,nrf-usbd";
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status = "okay";
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};
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#include <../boards/common/usb/cdc_acm_serial.dtsi>

‎boards/nordic/nrf52840dongle/nrf52840dongle_nrf52840_bare.yaml‎

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identifier: nrf52840dongle/nrf52840/bare
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name: nRF52840-Dongle-NRF52840-bare
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type: mcu
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arch: arm
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ram: 256
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flash: 1024
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toolchain:
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- zephyr
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- gnuarmemb
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supported:
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- adc
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- usb_device
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- ble
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- pwm
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- spi
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- watchdog
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- counter
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- netif:openthread
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- gpio
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vendor: nordic

‎boards/nordic/nrf52840dongle/nrf52840dongle_nrf52840_bare_defconfig‎

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# SPDX-License-Identifier: Apache-2.0
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# Enable MPU
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CONFIG_ARM_MPU=y
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# Enable hardware stack protection
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CONFIG_HW_STACK_PROTECTION=y
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# enable GPIO
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CONFIG_GPIO=y
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# Board Kconfig.defconfig enables USB CDC ACM and should disable USB remote
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# wakeup by default. It needs to be disabled here, because the USB nrfx
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# driver always overwrites option from Kconfig mentioned above with the
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# imply from CONFIG_USB_NRFX.
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CONFIG_USB_DEVICE_REMOTE_WAKEUP=n

‎tests/drivers/adc/adc_api/boards/nrf52840dongle_nrf52840_bare.overlay‎

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/*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Copyright (c) 2025 Tomasz Chyrowicz <[email protected]>
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*/
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#include "nordic,nrf-saadc-common.dtsi"

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