From 2082a4d18967d23bbc77efebde20c5851422e21f Mon Sep 17 00:00:00 2001
From: Ned Konz <ned@metamagix.tech>
Date: Sun, 5 Oct 2025 10:45:41 -0700
Subject: [PATCH] zephyr/boards: Add NXP MIMXRT1020 EVK board.

This board has plenty of RAM, flash, and peripherals, including Ethernet.
It also has a microSD slot, which also works.

Access to the REPL is via UART1, which is available via the DAPLink
connector J23.

Signed-off-by: Ned Konz <ned@metamagix.tech>
---
 ports/zephyr/boards/mimxrt1020_evk.conf       | 21 +++++++++++++++++++
 ports/zephyr/boards/mimxrt1020_evk.overlay    |  9 ++++++++
 .../zephyr/boards/mimxrt1020_evk/manifest.py  |  6 ++++++
 .../boards/mimxrt1020_evk/mpconfigport.h      |  3 +++
 4 files changed, 39 insertions(+)
 create mode 100644 ports/zephyr/boards/mimxrt1020_evk.conf
 create mode 100644 ports/zephyr/boards/mimxrt1020_evk.overlay
 create mode 100644 ports/zephyr/boards/mimxrt1020_evk/manifest.py
 create mode 100644 ports/zephyr/boards/mimxrt1020_evk/mpconfigport.h

diff --git a/ports/zephyr/boards/mimxrt1020_evk.conf b/ports/zephyr/boards/mimxrt1020_evk.conf
new file mode 100644
index 0000000000..b782520514
--- /dev/null
+++ b/ports/zephyr/boards/mimxrt1020_evk.conf
@@ -0,0 +1,21 @@
+CONFIG_USB_DEVICE_STACK=y
+CONFIG_USB_DEVICE_PRODUCT="Zephyr MicroPython"
+CONFIG_USB_MASS_STORAGE=y
+CONFIG_MASS_STORAGE_DISK_NAME="SDMMC"
+
+CONFIG_FLASH=y
+CONFIG_FLASH_MAP=y
+CONFIG_FLASH_PAGE_LAYOUT=y
+
+CONFIG_MICROPY_FROZEN_MODULES=y
+CONFIG_MICROPY_FROZEN_MANIFEST="boards/mimxrt1020_evk/manifest.py"
+CONFIG_MICROPY_CONFIGFILE="boards/mimxrt1020_evk/mpconfigport.h"
+
+# CONFIG_DYNAMIC_THREAD=y
+CONFIG_THREAD_CUSTOM_DATA=y
+CONFIG_THREAD_MONITOR=y
+CONFIG_THREAD_STACK_INFO=y
+
+CONFIG_LOG=n
+CONFIG_FP16=n
+CONFIG_BOOT_BANNER=n
diff --git a/ports/zephyr/boards/mimxrt1020_evk.overlay b/ports/zephyr/boards/mimxrt1020_evk.overlay
new file mode 100644
index 0000000000..83358de954
--- /dev/null
+++ b/ports/zephyr/boards/mimxrt1020_evk.overlay
@@ -0,0 +1,9 @@
+/ {
+	aliases {
+		watchdog0 = &wdog0;
+	};
+};
+
+&wdog0 {
+	status = "okay";
+};
diff --git a/ports/zephyr/boards/mimxrt1020_evk/manifest.py b/ports/zephyr/boards/mimxrt1020_evk/manifest.py
new file mode 100644
index 0000000000..7d98d906e1
--- /dev/null
+++ b/ports/zephyr/boards/mimxrt1020_evk/manifest.py
@@ -0,0 +1,6 @@
+include("$(MPY_DIR)/extmod/asyncio")
+
+freeze("$(PORT_DIR)/modules")
+
+require("upysh")
+require("aiorepl")
diff --git a/ports/zephyr/boards/mimxrt1020_evk/mpconfigport.h b/ports/zephyr/boards/mimxrt1020_evk/mpconfigport.h
new file mode 100644
index 0000000000..6c62ad5497
--- /dev/null
+++ b/ports/zephyr/boards/mimxrt1020_evk/mpconfigport.h
@@ -0,0 +1,3 @@
+#define MICROPY_CONFIG_ROM_LEVEL (MICROPY_CONFIG_ROM_LEVEL_EXTRA_FEATURES)
+
+#include "../mpconfigport.h"