From c9a16e862caed343a55d6d192c833def3910d53a Mon Sep 17 00:00:00 2001
From: Vdragon <mail@massdriver.space>
Date: Sat, 4 Oct 2025 14:04:19 +0200
Subject: [PATCH] zephyr: Add boards files for rp2350's m33 on pico 2.

Adds overlay and conf for RPi Pico2 ARM cpu on the zephyr port.

Signed-off-by: Vdragon <mail@massdriver.space>
---
 .../zephyr/boards/rpi_pico2_rp2350a_m33.conf  | 17 +++++++
 .../boards/rpi_pico2_rp2350a_m33.overlay      | 50 +++++++++++++++++++
 2 files changed, 67 insertions(+)
 create mode 100644 ports/zephyr/boards/rpi_pico2_rp2350a_m33.conf
 create mode 100644 ports/zephyr/boards/rpi_pico2_rp2350a_m33.overlay

diff --git a/ports/zephyr/boards/rpi_pico2_rp2350a_m33.conf b/ports/zephyr/boards/rpi_pico2_rp2350a_m33.conf
new file mode 100644
index 0000000000..8460127247
--- /dev/null
+++ b/ports/zephyr/boards/rpi_pico2_rp2350a_m33.conf
@@ -0,0 +1,17 @@
+# Configure serial console over USB CDC ACM.
+CONFIG_USB_DEVICE_STACK_NEXT=y
+CONFIG_USBD_CDC_ACM_CLASS=y
+CONFIG_UART_LINE_CTRL=y
+
+# Disable networking.
+CONFIG_NETWORKING=n
+
+# Hardware features.
+CONFIG_FLASH=y
+CONFIG_FLASH_MAP=y
+CONFIG_I2C=y
+CONFIG_I2C_TARGET=y
+CONFIG_SPI=y
+
+# MicroPython config.
+CONFIG_MICROPY_HEAP_SIZE=458752
diff --git a/ports/zephyr/boards/rpi_pico2_rp2350a_m33.overlay b/ports/zephyr/boards/rpi_pico2_rp2350a_m33.overlay
new file mode 100644
index 0000000000..e5261561f8
--- /dev/null
+++ b/ports/zephyr/boards/rpi_pico2_rp2350a_m33.overlay
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2025 MASSDRIVER EI (massdriver.space)
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		/* Use USB CDC ACM as the console. */
+		zephyr,console = &cdc_acm_uart0;
+	};
+};
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		second_stage_bootloader: partition@0 {
+			label = "second_stage_bootloader";
+			reg = <0x00000000 0x100>;
+			read-only;
+		};
+
+		code_partition: partition@100 {
+			label = "code-partition";
+			reg = <0x0000100 (DT_SIZE_M(1) - 0x100)>;
+			read-only;
+		};
+
+		storage_partition: partition@100000 {
+			label = "storage";
+			reg = <0x00100000 DT_SIZE_M(3)>;
+		};
+	};
+};
+
+&zephyr_udc0 {
+	cdc_acm_uart0: cdc_acm_uart0 {
+		compatible = "zephyr,cdc-acm-uart";
+	};
+};
+
+&i2c1 {
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	status = "okay";
+	pinctrl-0 = <&i2c1_default>;
+	pinctrl-names = "default";
+};