diff --git a/ports/rp2/boards/DUALMCU_RP2040/README.md b/ports/rp2/boards/DUALMCU_RP2040/README.md
new file mode 100644
index 0000000000000..fe74e0a7d30a0
--- /dev/null
+++ b/ports/rp2/boards/DUALMCU_RP2040/README.md
@@ -0,0 +1,19 @@
+# UNIT Electronics DualMCU RP2040 + ESP32
+
+Board definition for the RP2040 side of the DualMCU board.
+
+## Default buses
+
+- LED: GPIO25
+- UART0: TX=GPIO0, RX=GPIO1
+- UART1: TX=GPIO8, RX=GPIO9
+- I2C0: SDA=GPIO12, SCL=GPIO13
+- SPI0: SCK=GPIO18, MOSI=GPIO19, MISO=GPIO20, CS=GPIO21
+
+## Build
+
+```bash
+make -C mpy-cross
+make -C ports/rp2 BOARD=DUALMCU_RP2040 submodules
+make -C ports/rp2 BOARD=DUALMCU_RP2040
+```
diff --git a/ports/rp2/boards/DUALMCU_RP2040/board.json b/ports/rp2/boards/DUALMCU_RP2040/board.json
new file mode 100644
index 0000000000000..2d6ec36454eda
--- /dev/null
+++ b/ports/rp2/boards/DUALMCU_RP2040/board.json
@@ -0,0 +1,19 @@
+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [
+        "Dual-core",
+        "External Flash",
+        "USB"
+    ],
+    "images": [
+        "https://uelectronics.com/wp-content/uploads/2023/03/AR3578-UNIT-DualMCU-ESP32-RP2040-6.jpg"
+    ],
+    "mcu": "rp2040",
+    "product": "DualMCU RP2040 + ESP32",
+    "thumbnail": "",
+    "url": "https://uelectronics.com/producto/unit-dualmcu-esp32-rp2040-tarjeta-de-desarrollo/",
+    "vendor": "UNIT Electronics"
+}
diff --git a/ports/rp2/boards/DUALMCU_RP2040/mpconfigboard.cmake b/ports/rp2/boards/DUALMCU_RP2040/mpconfigboard.cmake
new file mode 100644
index 0000000000000..6be83cb4ee27c
--- /dev/null
+++ b/ports/rp2/boards/DUALMCU_RP2040/mpconfigboard.cmake
@@ -0,0 +1,3 @@
+# cmake file for UNIT Electronics DualMCU RP2040 + ESP32.
+set(PICO_BOARD "pico")
+set(PICO_PLATFORM "rp2040")
diff --git a/ports/rp2/boards/DUALMCU_RP2040/mpconfigboard.h b/ports/rp2/boards/DUALMCU_RP2040/mpconfigboard.h
new file mode 100644
index 0000000000000..dd5aec482ec7f
--- /dev/null
+++ b/ports/rp2/boards/DUALMCU_RP2040/mpconfigboard.h
@@ -0,0 +1,25 @@
+// Board config for UNIT Electronics DualMCU RP2040 + ESP32.
+
+// Board and hardware specific configuration
+#define MICROPY_HW_BOARD_NAME           "DualMCU RP2040"
+#define MICROPY_HW_ENABLE_UART_REPL     (1)
+
+// UART defaults from board pinout.
+#define MICROPY_HW_UART0_TX             (0)
+#define MICROPY_HW_UART0_RX             (1)
+#define MICROPY_HW_UART0_CTS            (-1)
+#define MICROPY_HW_UART0_RTS            (-1)
+
+#define MICROPY_HW_UART1_TX             (8)
+#define MICROPY_HW_UART1_RX             (9)
+#define MICROPY_HW_UART1_CTS            (-1)
+#define MICROPY_HW_UART1_RTS            (-1)
+
+// I2C0 defaults from board pinout.
+#define MICROPY_HW_I2C0_SDA             (12)
+#define MICROPY_HW_I2C0_SCL             (13)
+
+// SPI0 defaults from board pinout.
+#define MICROPY_HW_SPI0_SCK             (18)
+#define MICROPY_HW_SPI0_MOSI            (19)
+#define MICROPY_HW_SPI0_MISO            (20)
diff --git a/ports/rp2/boards/DUALMCU_RP2040/pins.csv b/ports/rp2/boards/DUALMCU_RP2040/pins.csv
new file mode 100644
index 0000000000000..8de04437f11c6
--- /dev/null
+++ b/ports/rp2/boards/DUALMCU_RP2040/pins.csv
@@ -0,0 +1,29 @@
+TX0,GPIO0
+RX0,GPIO1
+IO2,GPIO2
+IO3,GPIO3
+CIPO,GPIO4
+IO6,GPIO6
+COPI,GPIO7
+TX1,GPIO8
+RX1,GPIO9
+IO10,GPIO10
+IO11,GPIO11
+IO12,GPIO12
+IO13,GPIO13
+IO14,GPIO14
+IO15,GPIO15
+SCK,GPIO18
+MOSI,GPIO19
+MISO,GPIO20
+CS,GPIO21
+IO22,GPIO22
+IO23,GPIO23
+IO25,GPIO25
+A0,GPIO26
+A1,GPIO27
+A2,GPIO28
+A3,GPIO29
+SDA,GPIO12
+SCL,GPIO13
+LED,GPIO25