adafruit · dhalbert · Aug 6, 2026 · Aug 5, 2026
diff --git a/ports/zephyr-cp/boards/adafruit/feather_nrf52840_sense_zephyr/autogen_board_info.toml b/ports/zephyr-cp/boards/adafruit/feather_nrf52840_sense_zephyr/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/adafruit/feather_nrf52840_zephyr/autogen_board_info.toml b/ports/zephyr-cp/boards/adafruit/feather_nrf52840_zephyr/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/adafruit/feather_rp2040_zephyr/autogen_board_info.toml b/ports/zephyr-cp/boards/adafruit/feather_rp2040_zephyr/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/native/native_sim/autogen_board_info.toml b/ports/zephyr-cp/boards/native/native_sim/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = true # Zephyr board has zephyr_display
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/native/nrf5340bsim/autogen_board_info.toml b/ports/zephyr-cp/boards/native/nrf5340bsim/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/nordic/nrf5340dk/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf5340dk/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/nordic/nrf54h20dk/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf54h20dk/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/nordic/nrf54l15dk/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf54l15dk/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/nordic/nrf54l15tag/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf54l15tag/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/nordic/nrf54lm20dk/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf54lm20dk/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/nordic/nrf7002dk/autogen_board_info.toml b/ports/zephyr-cp/boards/nordic/nrf7002dk/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = true # Zephyr board has wifi
 zephyr_display = false
 zephyr_kernel = false
 zlib = false
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/nrf54h20dk_nrf54h20_cpuapp.overlay b/ports/zephyr-cp/boards/nrf54h20dk_nrf54h20_cpuapp.overlay
@@ -44,4 +44,12 @@
 	status = "okay";
 };
 
+/* Remove slot1 (OTA), expand slot0 to use the space.
+ * CircuitPython doesn't use OTA updates. */
+&slot0_partition {
+	reg = <0x40000 DT_SIZE_K(656)>;
+};
+
+/delete-node/ &slot1_partition;
+
 #include "../app.overlay"
diff --git a/ports/zephyr-cp/boards/nxp/frdm_mcxn947/autogen_board_info.toml b/ports/zephyr-cp/boards/nxp/frdm_mcxn947/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/nxp/frdm_rw612/autogen_board_info.toml b/ports/zephyr-cp/boards/nxp/frdm_rw612/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = true # Zephyr board has wifi
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/nxp/mimxrt1170_evk/autogen_board_info.toml b/ports/zephyr-cp/boards/nxp/mimxrt1170_evk/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/raspberrypi/rpi_pico2_w_zephyr/autogen_board_info.toml b/ports/zephyr-cp/boards/raspberrypi/rpi_pico2_w_zephyr/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = true # Zephyr board has wifi
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/raspberrypi/rpi_pico2_zephyr/autogen_board_info.toml b/ports/zephyr-cp/boards/raspberrypi/rpi_pico2_zephyr/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/raspberrypi/rpi_pico_w_zephyr/autogen_board_info.toml b/ports/zephyr-cp/boards/raspberrypi/rpi_pico_w_zephyr/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = true # Zephyr board has wifi
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/raspberrypi/rpi_pico_zephyr/autogen_board_info.toml b/ports/zephyr-cp/boards/raspberrypi/rpi_pico_zephyr/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/renesas/da14695_dk_usb/autogen_board_info.toml b/ports/zephyr-cp/boards/renesas/da14695_dk_usb/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/renesas/ek_ra6m5/autogen_board_info.toml b/ports/zephyr-cp/boards/renesas/ek_ra6m5/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/renesas/ek_ra8d1/autogen_board_info.toml b/ports/zephyr-cp/boards/renesas/ek_ra8d1/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = true # Zephyr board has zephyr_display
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/st/nucleo_n657x0_q/autogen_board_info.toml b/ports/zephyr-cp/boards/st/nucleo_n657x0_q/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/st/nucleo_u575zi_q/autogen_board_info.toml b/ports/zephyr-cp/boards/st/nucleo_u575zi_q/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/st/stm32h750b_dk/autogen_board_info.toml b/ports/zephyr-cp/boards/st/stm32h750b_dk/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = true # Zephyr board has zephyr_display
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/st/stm32h7b3i_dk/autogen_board_info.toml b/ports/zephyr-cp/boards/st/stm32h7b3i_dk/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = true # Zephyr board has zephyr_display
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/boards/st/stm32wba65i_dk1/autogen_board_info.toml b/ports/zephyr-cp/boards/st/stm32wba65i_dk1/autogen_board_info.toml
@@ -121,3 +121,9 @@ wifi = false
 zephyr_display = false
 zephyr_kernel = false
 zlib = true
+# extmod modules shared with MicroPython
+asyncio = true
+binascii = true
+json = true
+re = true
+select = true
diff --git a/ports/zephyr-cp/cptools/build_circuitpython.py b/ports/zephyr-cp/cptools/build_circuitpython.py
@@ -67,10 +67,18 @@
     "adafruit_bus_device",
     "getpass",
     "storage",
+    "binascii",
+    "re",
+    "asyncio",
+    "select",
 ]
 # Flags that don't match with with a *bindings module. Some used by adafruit_requests
 MPCONFIG_FLAGS = ["array", "errno", "io", "json", "math"]
 
+# extmod-based modules that should appear in the autogen list even though they
+# don't have shared-bindings/ or bindings/ directories.
+EXTMOD_MODULES = ["asyncio", "binascii", "json", "re", "select"]
+
 # List of other modules (the value) that can be enabled when another one (the key) is.
 REVERSE_DEPENDENCIES = {
     "audiobusio": ["audiocore"],
@@ -343,7 +351,7 @@ def determine_enabled_modules(board_info, portdir, srcdir):
     return enabled_modules, module_reasons
 
 
-async def build_circuitpython():
+async def build_circuitpython():  # noqa: C901
     circuitpython_flags = ["-DCIRCUITPY"]
     port_flags = []
     enable_mpy_native = False
@@ -362,6 +370,10 @@ async def build_circuitpython():
     circuitpython_flags.append(f"-DCIRCUITPY_ENABLE_MPY_NATIVE={1 if enable_mpy_native else 0}")
     circuitpython_flags.append(f"-DCIRCUITPY_FULL_BUILD={1 if full_build else 0}")
     circuitpython_flags.append(f"-DCIRCUITPY_SETTINGS_TOML={1 if full_build else 0}")
+    circuitpython_flags.append(f"-DMICROPY_PY_ASYNC_AWAIT={1 if full_build else 0}")
+    circuitpython_flags.append(f"-DMICROPY_PY_ASYNCIO={1 if full_build else 0}")
+    circuitpython_flags.append(f"-DMICROPY_PY_SELECT={1 if full_build else 0}")
+    circuitpython_flags.append(f"-DMICROPY_PY_SELECT_SELECT={1 if full_build else 0}")
     circuitpython_flags.append("-DCIRCUITPY_STATUS_BAR=1")
     circuitpython_flags.append(f"-DCIRCUITPY_USB_HOST={1 if usb_host else 0}")
     circuitpython_flags.append(f"-DCIRCUITPY_BOARD_ID='\"{board}\"'")
@@ -434,6 +446,10 @@ async def build_circuitpython():
     supervisor_source = [
         "main.c",
         "extmod/modjson.c",
+        "extmod/modbinascii.c",
+        "extmod/modre.c",
+        "extmod/modasyncio.c",
+        "extmod/modselect.c",
         "extmod/vfs_fat.c",
         "lib/tlsf/tlsf.c",
         portdir / "background.c",
@@ -592,6 +608,16 @@ async def build_circuitpython():
             logger.warning(
                 f"autogen_board_info.toml is missing or out of date. Please run `make BOARD={board}` locally and commit {autogen_board_info_fn}."
             )
+    autogen_modules.add(tomlkit.comment("extmod modules shared with MicroPython"))
+    for extmod_module in EXTMOD_MODULES:
+        enabled = extmod_module in enabled_modules
+        v = tomlkit.item(enabled)
+        if extmod_module in module_reasons:
+            v.comment(module_reasons[extmod_module])
+        autogen_modules.add(extmod_module, v)
+        flag_name = MODULE_FLAG_NAMES.get(extmod_module, extmod_module.upper())
+        circuitpython_flags.append(f"-DCIRCUITPY_{flag_name}={1 if enabled else 0}")
+
     if autogen_board_info_fn.parent.exists():
         autogen_board_info_fn.write_text(tomlkit.dumps(autogen_board_info))