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boards: milkv: Bring up Milk-V Duo
Milk-V Duo is a tiny development board shipped with SOPHGO CV1800B. Signed-off-by: Chen Xingyu <[email protected]>
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‎boards/milkv/duo/Kconfig.milkv_duo

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# Copyright (c) 2023-2024 Chen Xingyu <[email protected]>
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# SPDX-License-Identifier: Apache-2.0
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config BOARD_MILKV_DUO
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select SOC_CV1800B if BOARD_MILKV_DUO_CV1800B_C906_1
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select SOC_SG2002 if BOARD_MILKV_DUO_SG2002_C906_1

‎boards/milkv/duo/board.cmake

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# SPDX-License-Identifier: Apache-2.0
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include(${ZEPHYR_BASE}/boards/common/cvi-fiptool.board.cmake)

‎boards/milkv/duo/board.yml

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board:
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name: milkv_duo
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full_name: Duo
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vendor: milkv
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socs:
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- name: cv1800b
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- name: sg2002

‎boards/milkv/duo/doc/index.rst

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.. zephyr:board:: milkv_duo
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Overview
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********
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See https://milkv.io/duo
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Supported Features
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==================
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.. zephyr:board-supported-hw::
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Programming and Debugging
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*************************
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Prepare a TF card and follow the instructions in the `official SDK`_ to build
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and flash the image.
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After that, you will get a ``fip.bin`` file at the root of the TF card, where
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the RTOS image is packed.
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The following steps demonstrate how to build the blinky sample and update the
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``fip.bin`` file on the TF card.
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.. zephyr-app-commands::
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:zephyr-app: samples/basic/blinky
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:board: milkv_duo/cv1800b/c906_1
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:goals: build flash
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:flash-args: --fiptool /path/to/duo-buildroot-sdk/fsbl/plat/cv180x/fiptool.py --fip-bin /path/to/tfcard/fip.bin
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Eject the TF card and insert it into the board. Power on the board and you will
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see the LED blinking.
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.. note::
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Notes for the official buildroot SDK
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1. The Linux running on the big core uses UART0 (GP12/GP13) for the console,
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while to avoid conflict, the Zephyr application (in the default board
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configuration) uses UART1 (GP0/GP1).
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2. Pin multiplexing can be handled either by U-Boot or Zephyr. To utilize
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Zephyr's pin multiplexing, enable :kconfig:option:`CONFIG_PINCTRL` and
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recompile U-Boot without the PINMUX configs. The source code for the
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PINMUX configs varies by SoC:
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* For Duo (CV1800B), see `PINMUX configs (Duo)`_
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* For Duo 256M (SG2002), see `PINMUX configs (Duo 256M)`_
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Note that U-Boot boots several seconds after Zephyr.
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3. By default, the Linux running on the big core will blink the LED on the
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board. To demonstrate Zephyr (specifically, the ``samples/basic/blinky``
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sample), you should remove the script from the Linux filesystem located at
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``/mnt/system/blink.sh``.
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.. _official SDK:
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https://github.com/milkv-duo/duo-buildroot-sdk
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.. _PINMUX configs (Duo):
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https://github.com/milkv-duo/duo-buildroot-sdk/blob/develop/build/boards/cv180x/cv1800b_milkv_duo_sd/u-boot/cvi_board_init.c
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.. _PINMUX configs (Duo 256M):
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https://github.com/milkv-duo/duo-buildroot-sdk/blob/develop/build/boards/cv181x/cv1812cp_milkv_duo256m_sd/u-boot/cvi_board_init.c

‎boards/milkv/duo/milkv_duo-pinctrl.dtsi

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/*
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* Copyright (c) 2023-2024 Chen Xingyu <[email protected]>
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* SPDX-License-Identifier: Apache-2.0
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*/
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&pinctrl {
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uart1_default: uart1_default {
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group1 {
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pinmux = <CVI_PINMUX(IIC0_SCL, UART1_TX)>, /* GP0 */
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<CVI_PINMUX(IIC0_SDA, UART1_RX)>; /* GP1 */
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};
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};
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};

‎boards/milkv/duo/milkv_duo_cv1800b_c906_1.dts

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/*
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* Copyright (c) 2023-2024 Chen Xingyu <[email protected]>
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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 <sophgo/cv180x.dtsi>
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#include <zephyr/dt-bindings/gpio/gpio.h>
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#include "milkv_duo-pinctrl.dtsi"
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/ {
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model = "Milk-V Duo coprocessor";
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compatible = "milkv,duo";
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chosen {
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zephyr,sram = &sram;
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zephyr,console = &uart1;
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zephyr,shell-uart = &uart1;
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};
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aliases {
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led0 = &led;
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};
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leds {
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compatible = "gpio-leds";
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led: led {
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gpios = <&gpioc 24 GPIO_ACTIVE_HIGH>;
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};
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};
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soc {
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/*
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* Memory region reserved for the RTOS core.
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*
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* Keep in sync with FREERTOS_ADDR and FREERTOS_SIZE in
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* build/boards/cv180x/cv1800b_milkv_duo_sd/memmap.py
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*
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* see: https://github.com/milkv-duo/duo-buildroot-sdk
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*/
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sram: memory@83f40000 {
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compatible = "mmio-sram";
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reg = <0x83f40000 DT_SIZE_K(768)>;
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};
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};
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};
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&gpioc {
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status = "okay";
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};
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&uart1 {
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status = "okay";
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pinctrl-0 = <&uart1_default>;
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pinctrl-names = "default";
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current-speed = <115200>;
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};

‎boards/milkv/duo/milkv_duo_cv1800b_c906_1.yaml

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identifier: milkv_duo/cv1800b/c906_1
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name: Milk-V Duo coprocessor
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type: mcu
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arch: riscv
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toolchain:
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- zephyr
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ram: 768
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supported:
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- clock
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- gpio
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- interrupt-controller
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- mailbox
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- pinctrl
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- pwm
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- serial

‎boards/milkv/duo/milkv_duo_cv1800b_c906_1_defconfig

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# Copyright (c) 2023-2024 Chen Xingyu <[email protected]>
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# SPDX-License-Identifier: Apache-2.0
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CONFIG_XIP=n
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CONFIG_GPIO=y
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CONFIG_SERIAL=y
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CONFIG_CONSOLE=y
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CONFIG_UART_CONSOLE=y

‎boards/milkv/duo/milkv_duo_sg2002_c906_1.dts

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/*
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* Copyright (c) 2024 Chen Xingyu <[email protected]>
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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 <sophgo/cv181x.dtsi>
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#include <zephyr/dt-bindings/gpio/gpio.h>
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#include "milkv_duo-pinctrl.dtsi"
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/ {
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model = "Milk-V Duo 256M coprosessor";
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compatible = "milkv,duo";
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chosen {
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zephyr,sram = &sram;
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zephyr,console = &uart1;
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zephyr,shell-uart = &uart1;
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};
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aliases {
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led0 = &led;
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};
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leds {
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compatible = "gpio-leds";
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led: led {
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gpios = <&pwr_gpio 2 GPIO_ACTIVE_HIGH>;
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};
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};
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soc {
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/*
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* Memory region reserved for the RTOS core.
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*
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* Keep in sync with FREERTOS_ADDR and FREERTOS_SIZE in
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* build/boards/cv181x/cv1812cp_milkv_duo256m_sd/memmap.py
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*
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* see: https://github.com/milkv-duo/duo-buildroot-sdk
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*/
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sram: memory@8fe00000 {
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compatible = "mmio-sram";
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reg = <0x8fe00000 DT_SIZE_M(2)>;
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};
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};
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};
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&pwr_gpio {
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status = "okay";
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};
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&uart1 {
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status = "okay";
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pinctrl-0 = <&uart1_default>;
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pinctrl-names = "default";
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current-speed = <115200>;
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};

‎boards/milkv/duo/milkv_duo_sg2002_c906_1.yaml

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identifier: milkv_duo/sg2002/c906_1
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name: Milk-V Duo 256M coprocessor
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type: mcu
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arch: riscv
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toolchain:
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- zephyr
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ram: 2048
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supported:
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- clock
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- gpio
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- interrupt-controller
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- mailbox
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- pinctrl
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- pwm
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- serial

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