diff --git a/.github/actions/deps/external/action.yml b/.github/actions/deps/external/action.yml
index 9f6dbf222a4..0624042b45b 100644
--- a/.github/actions/deps/external/action.yml
+++ b/.github/actions/deps/external/action.yml
@@ -40,6 +40,7 @@ runs:
       run: |
         source $IDF_PATH/export.sh
         echo >> $GITHUB_ENV "IDF_PYTHON_ENV_PATH=$IDF_PYTHON_ENV_PATH"
+        echo >> $GITHUB_ENV "ESP_IDF_VERSION=$ESP_IDF_VERSION"
         echo >> $GITHUB_PATH "$PATH"
       shell: bash
 
diff --git a/.gitmodules b/.gitmodules
index 6ac7a079035..f02565e6915 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -421,3 +421,6 @@
 [submodule "frozen/Adafruit_CircuitPython_TAS2505"]
 	path = frozen/Adafruit_CircuitPython_TAS2505
 	url = https://github.com/adafruit/Adafruit_CircuitPython_TAS2505.git
+[submodule "ports/espressif/esp-hosted"]
+	path = ports/espressif/esp-hosted
+	url = https://github.com/espressif/esp-hosted-mcu.git
diff --git a/ports/espressif/CMakeLists.txt b/ports/espressif/CMakeLists.txt
index 608d4f4c7b3..e0901d649a4 100644
--- a/ports/espressif/CMakeLists.txt
+++ b/ports/espressif/CMakeLists.txt
@@ -8,7 +8,13 @@ set(ENV{IDF_PATH} ${CMAKE_SOURCE_DIR}/esp-idf)
 set(COMPONENTS bt driver esp_driver_dac esp_driver_gpio esp_driver_gptimer esp_driver_i2c esp_driver_i2s esp_driver_ledc esp_driver_pcnt esp_driver_rmt esp_driver_sdmmc esp_driver_spi esp_driver_touch_sens esp_driver_tsens esp_driver_uart esp_eth esp-tls esp_adc esp_adc_cal esp_event esp_netif esp_psram esp_security esp_wifi esptool_py freertos log lwip main mbedtls mdns pthread soc ulp wpa_supplicant esp-camera esp_lcd vfs esp_vfs_console esp_stdio sdmmc usb)
 set(EXTRA_COMPONENT_DIRS "esp-protocols/components/mdns" "esp-camera")
 
+if(CIRCUITPY_ESP_HOSTED)
+    list(APPEND EXTRA_COMPONENT_DIRS "esp-hosted")
+    list(APPEND COMPONENTS esp-hosted)
+endif()
+
 include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+set(ENV{ESP_IDF_VERSION} "${IDF_VERSION_MAJOR}.${IDF_VERSION_MINOR}")
 project(circuitpython)
 
 idf_build_set_property(__OUTPUT_SDKCONFIG 0)
diff --git a/ports/espressif/Makefile b/ports/espressif/Makefile
index 1d713916168..978a3b0e7c0 100644
--- a/ports/espressif/Makefile
+++ b/ports/espressif/Makefile
@@ -6,6 +6,9 @@
 
 include ../../py/circuitpy_mkenv.mk
 
+# Keep dependency selection identical during automatic CMake reconfiguration.
+export IDF_COMPONENT_MANAGER = 0
+
 ifeq ($(IDF_TARGET),esp32s3)
 BT_IDF_TARGET = esp32c3
 else ifeq ($(IDF_TARGET),esp32c61)
@@ -261,9 +264,11 @@ endif
 
 ifneq ($(CIRCUITPY_WIFI),0)
 ifeq ($(filter $(IDF_TARGET),esp32s2 esp32p4),)
+ifneq ($(CIRCUITPY_ESP_HOSTED),1)
 REGISTRATION_FUNCTIONS += -u esp_coex_init_include_func
 endif
 endif
+endif
 
 
 #Debugging/Optimization
@@ -936,7 +941,7 @@ do-sdkconfig: $(BUILD)/esp-idf/config/sdkconfig.h
 QSTR_GLOBAL_REQUIREMENTS += $(BUILD)/esp-idf/config/sdkconfig.h
 $(BUILD)/esp-idf/config/sdkconfig.h: boards/$(BOARD)/sdkconfig boards/$(BOARD)/mpconfigboard.mk CMakeLists.txt | $(BUILD)/esp-idf
 	$(STEPECHO) "Create $@"
-	$(Q)env IDF_PATH=$(IDF_PATH) IDF_COMPONENT_MANAGER=0 cmake -S . -B $(BUILD)/esp-idf -DSDKCONFIG=$(BUILD)/esp-idf/sdkconfig -DSDKCONFIG_DEFAULTS="$(SDKCONFIGS)" -DCMAKE_TOOLCHAIN_FILE=$(IDF_PATH)/tools/cmake/toolchain-$(IDF_TARGET).cmake -DIDF_TARGET=$(IDF_TARGET) -GNinja
+	$(Q)env IDF_PATH=$(IDF_PATH) IDF_COMPONENT_MANAGER=0 cmake -S . -B $(BUILD)/esp-idf -DSDKCONFIG=$(BUILD)/esp-idf/sdkconfig -DSDKCONFIG_DEFAULTS="$(SDKCONFIGS)" -DCMAKE_TOOLCHAIN_FILE=$(IDF_PATH)/tools/cmake/toolchain-$(IDF_TARGET).cmake -DIDF_TARGET=$(IDF_TARGET) -DCIRCUITPY_ESP_HOSTED=$(CIRCUITPY_ESP_HOSTED) -GNinja
 	$(Q)$(PYTHON) tools/check-sdkconfig.py \
 		CIRCUITPY_DUALBANK=$(CIRCUITPY_DUALBANK) \
 		CIRCUITPY_STORAGE_EXTEND=$(CIRCUITPY_STORAGE_EXTEND) \
@@ -974,6 +979,7 @@ BINARY_WIFI_BLOBS = libcore.a libespnow.a libnet80211.a libpp.a libsmartconfig.a
 ifneq ($(IDF_TARGET),esp32p4)
 	BINARY_BLOBS = esp-idf/components/esp_phy/lib/$(IDF_TARGET)/libphy.a
 endif
+ifneq ($(CIRCUITPY_ESP_HOSTED),1)
 ifneq ($(CIRCUITPY_WIFI),0)
 	BINARY_BLOBS += $(addprefix esp-idf/components/esp_wifi/lib/$(IDF_TARGET)/, $(BINARY_WIFI_BLOBS))
 	BINARY_BLOBS += esp-idf/components/esp_coex/lib/$(IDF_TARGET)/libcoexist.a
@@ -982,6 +988,8 @@ ifneq ($(CIRCUITPY_WIFI),0)
 	endif
 endif
 
+endif
+
 ifeq ($(IDF_TARGET),esp32)
 BINARY_BLOBS += esp-idf/components/esp_phy/lib/$(IDF_TARGET)/librtc.a
 endif
@@ -1037,7 +1045,17 @@ endif
 # component is interface-only elsewhere, so it must not appear in the list of
 # components to link.
 ifneq ($(CIRCUITPY_WIFI),0)
-	ESP_IDF_COMPONENTS_LINK += esp_coex esp_netif esp_security esp-tls esp_wifi lwip mdns wpa_supplicant esp_phy
+	ESP_IDF_COMPONENTS_LINK += esp_netif esp_security esp-tls esp_wifi lwip mbedtls mdns
+ifneq ($(CIRCUITPY_ESP_HOSTED),1)
+ESP_IDF_COMPONENTS_LINK += esp_coex esp_phy wpa_supplicant
+endif
+endif
+ifeq ($(CIRCUITPY_ESP_HOSTED),1)
+# ESP-IDF v6.1+ has remote Wi-Fi support built into esp_wifi, so no separate
+# esp_wifi_remote component is needed.
+INC := -isystem esp-hosted/host/api/include -isystem esp-hosted/host $(INC)
+ESP_IDF_COMPONENTS_LINK += esp-hosted esp_http_client http_parser console
+REGISTRATION_FUNCTIONS += -u esp_hosted_init
 endif
 # mdns registers handlers on ETH_EVENT, which is defined by esp_eth. On EMAC-capable
 # targets, esp_eth's compiled EMAC sources reference the esp_hal_emac symbols; that
diff --git a/ports/espressif/boards/adafruit_metro_esp32p4/board.c b/ports/espressif/boards/adafruit_metro_esp32p4/board.c
new file mode 100644
index 00000000000..85e13ed334d
--- /dev/null
+++ b/ports/espressif/boards/adafruit_metro_esp32p4/board.c
@@ -0,0 +1,24 @@
+// This file is part of the CircuitPython project: https://circuitpython.org
+//
+// SPDX-FileCopyrightText: Copyright (c) 2026 Limor Fried for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include "supervisor/board.h"
+#include "esp_ldo_regulator.h"
+
+static esp_ldo_channel_handle_t io_ldo;
+
+void board_init(void) {
+    // Keep the rail acquired across simulated deep-sleep wakes.
+    if (io_ldo != NULL) {
+        return;
+    }
+
+    // The SD card and C6 control pins (GPIO39-48) require the VO4 3.3 V rail.
+    const esp_ldo_channel_config_t config = {
+        .chan_id = 4,
+        .voltage_mv = 3300,
+    };
+    ESP_ERROR_CHECK(esp_ldo_acquire_channel(&config, &io_ldo));
+}
diff --git a/ports/espressif/boards/adafruit_metro_esp32p4/mpconfigboard.h b/ports/espressif/boards/adafruit_metro_esp32p4/mpconfigboard.h
new file mode 100644
index 00000000000..b6675893027
--- /dev/null
+++ b/ports/espressif/boards/adafruit_metro_esp32p4/mpconfigboard.h
@@ -0,0 +1,30 @@
+// This file is part of the CircuitPython project: https://circuitpython.org
+//
+// SPDX-FileCopyrightText: Copyright (c) 2026 Limor Fried for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#define MICROPY_HW_BOARD_NAME "Adafruit Metro ESP32-P4"
+#define MICROPY_HW_MCU_NAME "ESP32P4"
+
+#define MICROPY_HW_NEOPIXEL (&pin_GPIO23)
+#define CIRCUITPY_BOOT_BUTTON (&pin_GPIO35)
+
+#define DEFAULT_I2C_BUS_SCL (&pin_GPIO32)
+#define DEFAULT_I2C_BUS_SDA (&pin_GPIO33)
+
+#define DEFAULT_SPI_BUS_SCK (&pin_GPIO15)
+#define DEFAULT_SPI_BUS_MOSI (&pin_GPIO16)
+#define DEFAULT_SPI_BUS_MISO (&pin_GPIO17)
+
+#define DEFAULT_UART_BUS_RX (&pin_GPIO0)
+#define DEFAULT_UART_BUS_TX (&pin_GPIO1)
+
+// USB-C shares GPIO24/25 with the ROM USB Serial/JTAG downloader.
+#define CIRCUITPY_USB_DEVICE_INSTANCE 0
+#define CIRCUITPY_ESP32P4_SWAP_LSFS (1)
+
+// USB-A is connected to the dedicated high-speed PHY.
+#define CIRCUITPY_USB_HOST_INSTANCE 1
diff --git a/ports/espressif/boards/adafruit_metro_esp32p4/mpconfigboard.mk b/ports/espressif/boards/adafruit_metro_esp32p4/mpconfigboard.mk
new file mode 100644
index 00000000000..4dca7e3879a
--- /dev/null
+++ b/ports/espressif/boards/adafruit_metro_esp32p4/mpconfigboard.mk
@@ -0,0 +1,17 @@
+USB_VID = 0x239A
+USB_PID = 0x817C
+USB_PRODUCT = "Adafruit Metro ESP32-P4"
+USB_MANUFACTURER = "Adafruit"
+
+IDF_TARGET = esp32p4
+
+CIRCUITPY_USB_HOST = 1
+CIRCUITPY_ESP_HOSTED = 1
+
+CIRCUITPY_ESP_FLASH_SIZE = 16MB
+CIRCUITPY_ESP_FLASH_MODE = dio
+CIRCUITPY_ESP_FLASH_FREQ = 80m
+
+CIRCUITPY_ESP_PSRAM_SIZE = 16MB
+CIRCUITPY_ESP_PSRAM_MODE = hpi
+CIRCUITPY_ESP_PSRAM_FREQ = 200m
diff --git a/ports/espressif/boards/adafruit_metro_esp32p4/pins.c b/ports/espressif/boards/adafruit_metro_esp32p4/pins.c
new file mode 100644
index 00000000000..ee2679ae1f0
--- /dev/null
+++ b/ports/espressif/boards/adafruit_metro_esp32p4/pins.c
@@ -0,0 +1,81 @@
+// This file is part of the CircuitPython project: https://circuitpython.org
+//
+// SPDX-FileCopyrightText: Copyright (c) 2026 Limor Fried for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include "shared-bindings/board/__init__.h"
+
+static const mp_rom_map_elem_t board_module_globals_table[] = {
+    CIRCUITPYTHON_BOARD_DICT_STANDARD_ITEMS
+
+    { MP_ROM_QSTR(MP_QSTR_A0), MP_ROM_PTR(&pin_GPIO49) },
+    { MP_ROM_QSTR(MP_QSTR_A1), MP_ROM_PTR(&pin_GPIO50) },
+    { MP_ROM_QSTR(MP_QSTR_A2), MP_ROM_PTR(&pin_GPIO51) },
+    { MP_ROM_QSTR(MP_QSTR_A3), MP_ROM_PTR(&pin_GPIO52) },
+    { MP_ROM_QSTR(MP_QSTR_A4), MP_ROM_PTR(&pin_GPIO53) },
+    { MP_ROM_QSTR(MP_QSTR_A5), MP_ROM_PTR(&pin_GPIO54) },
+
+    { MP_ROM_QSTR(MP_QSTR_D0), MP_ROM_PTR(&pin_GPIO0) },
+    { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_GPIO0) },
+    { MP_ROM_QSTR(MP_QSTR_D1), MP_ROM_PTR(&pin_GPIO1) },
+    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_GPIO1) },
+    { MP_ROM_QSTR(MP_QSTR_D2), MP_ROM_PTR(&pin_GPIO2) },
+    { MP_ROM_QSTR(MP_QSTR_D3), MP_ROM_PTR(&pin_GPIO3) },
+    { MP_ROM_QSTR(MP_QSTR_D4), MP_ROM_PTR(&pin_GPIO4) },
+    { MP_ROM_QSTR(MP_QSTR_D5), MP_ROM_PTR(&pin_GPIO5) },
+    { MP_ROM_QSTR(MP_QSTR_D6), MP_ROM_PTR(&pin_GPIO6) },
+    { MP_ROM_QSTR(MP_QSTR_D7), MP_ROM_PTR(&pin_GPIO7) },
+    { MP_ROM_QSTR(MP_QSTR_D8), MP_ROM_PTR(&pin_GPIO8) },
+    { MP_ROM_QSTR(MP_QSTR_D9), MP_ROM_PTR(&pin_GPIO9) },
+    { MP_ROM_QSTR(MP_QSTR_D10), MP_ROM_PTR(&pin_GPIO10) },
+    { MP_ROM_QSTR(MP_QSTR_D11), MP_ROM_PTR(&pin_GPIO11) },
+    { MP_ROM_QSTR(MP_QSTR_D12), MP_ROM_PTR(&pin_GPIO12) },
+    { MP_ROM_QSTR(MP_QSTR_D13), MP_ROM_PTR(&pin_GPIO13) },
+    { MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_GPIO13) },
+
+    { MP_ROM_QSTR(MP_QSTR_SCK), MP_ROM_PTR(&pin_GPIO15) },
+    { MP_ROM_QSTR(MP_QSTR_MOSI), MP_ROM_PTR(&pin_GPIO16) },
+    { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_GPIO17) },
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_GPIO32) },
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_GPIO33) },
+
+    { MP_ROM_QSTR(MP_QSTR_BUTTON), MP_ROM_PTR(&pin_GPIO35) },
+    { MP_ROM_QSTR(MP_QSTR_NEOPIXEL), MP_ROM_PTR(&pin_GPIO23) },
+    { MP_ROM_QSTR(MP_QSTR_VOLTAGE_MONITOR), MP_ROM_PTR(&pin_GPIO18) },
+    { MP_ROM_QSTR(MP_QSTR_USB_HOST_DP), MP_ROM_PTR(&pin_USB_HS_DP) },
+    { MP_ROM_QSTR(MP_QSTR_USB_HOST_DM), MP_ROM_PTR(&pin_USB_HS_DM) },
+    { MP_ROM_QSTR(MP_QSTR_USB_HOST_POWER), MP_ROM_PTR(&pin_GPIO14) },
+    { MP_ROM_QSTR(MP_QSTR_DEBUG_TX), MP_ROM_PTR(&pin_GPIO37) },
+    { MP_ROM_QSTR(MP_QSTR_DEBUG_RX), MP_ROM_PTR(&pin_GPIO38) },
+
+    { MP_ROM_QSTR(MP_QSTR_SD_CLK), MP_ROM_PTR(&pin_GPIO43) },
+    { MP_ROM_QSTR(MP_QSTR_SD_CMD), MP_ROM_PTR(&pin_GPIO44) },
+    { MP_ROM_QSTR(MP_QSTR_SD_DATA0), MP_ROM_PTR(&pin_GPIO39) },
+    { MP_ROM_QSTR(MP_QSTR_SD_DATA1), MP_ROM_PTR(&pin_GPIO40) },
+    { MP_ROM_QSTR(MP_QSTR_SD_DATA2), MP_ROM_PTR(&pin_GPIO41) },
+    { MP_ROM_QSTR(MP_QSTR_SD_DATA3), MP_ROM_PTR(&pin_GPIO42) },
+    { MP_ROM_QSTR(MP_QSTR_SD_CD), MP_ROM_PTR(&pin_GPIO45) },
+
+    { MP_ROM_QSTR(MP_QSTR_C6_RX), MP_ROM_PTR(&pin_GPIO26) },
+    { MP_ROM_QSTR(MP_QSTR_C6_TX), MP_ROM_PTR(&pin_GPIO27) },
+    { MP_ROM_QSTR(MP_QSTR_C6_BOOT), MP_ROM_PTR(&pin_GPIO46) },
+    { MP_ROM_QSTR(MP_QSTR_C6_RESET), MP_ROM_PTR(&pin_GPIO47) },
+    { MP_ROM_QSTR(MP_QSTR_C6_WAKE), MP_ROM_PTR(&pin_GPIO48) },
+    { MP_ROM_QSTR(MP_QSTR_C6_SDIO_CLK), MP_ROM_PTR(&pin_GPIO34) },
+    { MP_ROM_QSTR(MP_QSTR_C6_SDIO_CMD), MP_ROM_PTR(&pin_GPIO36) },
+    { MP_ROM_QSTR(MP_QSTR_C6_SDIO_DATA0), MP_ROM_PTR(&pin_GPIO31) },
+    { MP_ROM_QSTR(MP_QSTR_C6_SDIO_DATA1), MP_ROM_PTR(&pin_GPIO30) },
+    { MP_ROM_QSTR(MP_QSTR_C6_SDIO_DATA2), MP_ROM_PTR(&pin_GPIO29) },
+    { MP_ROM_QSTR(MP_QSTR_C6_SDIO_DATA3), MP_ROM_PTR(&pin_GPIO28) },
+
+    { MP_ROM_QSTR(MP_QSTR_CAMERA_RESET), MP_ROM_PTR(&pin_GPIO21) },
+    { MP_ROM_QSTR(MP_QSTR_LCD_BACKLIGHT), MP_ROM_PTR(&pin_GPIO19) },
+    { MP_ROM_QSTR(MP_QSTR_LCD_RESET), MP_ROM_PTR(&pin_GPIO20) },
+
+    { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_STEMMA_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
+    { MP_ROM_QSTR(MP_QSTR_UART), MP_ROM_PTR(&board_uart_obj) },
+};
+MP_DEFINE_CONST_DICT(board_module_globals, board_module_globals_table);
diff --git a/ports/espressif/boards/adafruit_metro_esp32p4/sdkconfig b/ports/espressif/boards/adafruit_metro_esp32p4/sdkconfig
new file mode 100644
index 00000000000..a30634b1e0d
--- /dev/null
+++ b/ports/espressif/boards/adafruit_metro_esp32p4/sdkconfig
@@ -0,0 +1,25 @@
+CONFIG_ESP32P4_SELECTS_REV_LESS_V3=y
+CONFIG_ESP32P4_REV_MIN_1=y
+CONFIG_ESP_WIFI_REMOTE_ENABLED=y
+CONFIG_ESP_WIFI_REMOTE_LIBRARY_HOSTED=y
+CONFIG_SLAVE_IDF_TARGET_ESP32C6=y
+CONFIG_ESP_HOSTED_ENABLED=y
+CONFIG_ESP_HOSTED_CP_TARGET_ESP32C6=y
+CONFIG_ESP_HOSTED_P4_DEV_BOARD_NONE=y
+CONFIG_ESP_HOSTED_SDIO_HOST_INTERFACE=y
+CONFIG_ESP_HOSTED_SDIO_SLOT_1=y
+CONFIG_ESP_HOSTED_SDIO_4_BIT_BUS=y
+CONFIG_ESP_HOSTED_PRIV_SDIO_PIN_CLK_SLOT_1=34
+CONFIG_ESP_HOSTED_PRIV_SDIO_PIN_CMD_SLOT_1=36
+CONFIG_ESP_HOSTED_PRIV_SDIO_PIN_D0_SLOT_1=31
+CONFIG_ESP_HOSTED_PRIV_SDIO_PIN_D1_4BIT_BUS_SLOT_1=30
+CONFIG_ESP_HOSTED_PRIV_SDIO_PIN_D2_4BIT_BUS_SLOT_1=29
+CONFIG_ESP_HOSTED_PRIV_SDIO_PIN_D3_4BIT_BUS_SLOT_1=28
+CONFIG_ESP_HOSTED_SDIO_GPIO_RESET_SLAVE=47
+CONFIG_ESP_HOSTED_SDIO_CLOCK_FREQ_KHZ=40000
+
+# CONFIG_WIFI_RMT_NVS_ENABLED is not set
+
+# CONFIG_ESP_WIFI_NVS_ENABLED is not set
+
+# CONFIG_ESP32_WIFI_NVS_ENABLED is not set
diff --git a/ports/espressif/common-hal/sdioio/SDCard.c b/ports/espressif/common-hal/sdioio/SDCard.c
index 49a1a7340fa..2fd740e68e6 100644
--- a/ports/espressif/common-hal/sdioio/SDCard.c
+++ b/ports/espressif/common-hal/sdioio/SDCard.c
@@ -25,7 +25,6 @@ static const char *TAG = "SDCard.c";
 
 static bool slot_in_use[2];
 static bool never_reset_sdio[2] = { false, false };
-static bool host_initialized = false;
 
 static void common_hal_sdioio_sdcard_check_for_deinit(sdioio_sdcard_obj_t *self) {
     if (common_hal_sdioio_sdcard_deinited(self)) {
@@ -38,9 +37,17 @@ static int check_pins(const mcu_pin_obj_t *clock, const mcu_pin_obj_t *command,
     // ESP32-S3 and P4 can use any pin for any SDMMC func in either slot
     // Default to SLOT_1 for SD cards
     ESP_LOGI(TAG, "Using chip with CONFIG_SOC_SDMMC_USE_GPIO_MATRIX");
-    if (!slot_in_use[1]) {
+    if (!slot_in_use[1]
+        #ifdef CONFIG_ESP_HOSTED_SDIO_HOST_INTERFACE
+        && CONFIG_ESP_HOSTED_SDIO_SLOT != 1
+        #endif
+        ) {
         return SDMMC_HOST_SLOT_1;
-    } else if (!slot_in_use[0]) {
+    } else if (!slot_in_use[0]
+               #ifdef CONFIG_ESP_HOSTED_SDIO_HOST_INTERFACE
+               && CONFIG_ESP_HOSTED_SDIO_SLOT != 0
+               #endif
+               ) {
         return SDMMC_HOST_SLOT_0;
     }
     #else
@@ -88,6 +95,7 @@ void common_hal_sdioio_sdcard_construct(sdioio_sdcard_obj_t *self,
     esp_err_t err = ESP_OK;
 
     sdmmc_host_t host = SDMMC_HOST_DEFAULT();
+    host.slot = sd_slot;
     host.max_freq_khz = frequency / 1000;
 
     sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
@@ -116,7 +124,6 @@ void common_hal_sdioio_sdcard_construct(sdioio_sdcard_obj_t *self,
         if (err != ESP_OK) {
             mp_raise_OSError_msg_varg(MP_ERROR_TEXT("SDIO Init Error 0x%02x"), err);
         }
-        host_initialized = true;
     }
 
     err = sdmmc_host_init_slot(sd_slot, &slot_config);
@@ -254,13 +261,10 @@ void common_hal_sdioio_sdcard_deinit(sdioio_sdcard_obj_t *self) {
         return;
     }
 
+    sdmmc_host_deinit_slot(self->slot);
     never_reset_sdio[get_slot_index(self)] = false;
     slot_in_use[get_slot_index(self)] = false;
 
-    if (!slot_in_use[0] && !slot_in_use[1] && host_initialized) {
-        sdmmc_host_deinit();
-        host_initialized = false;
-    }
 
     reset_pin_number(self->command);
     self->command = COMMON_HAL_MCU_NO_PIN;
@@ -296,13 +300,12 @@ void common_hal_sdioio_sdcard_never_reset(sdioio_sdcard_obj_t *self) {
 void sdioio_reset(void) {
     for (size_t i = 0; i < MP_ARRAY_SIZE(slot_in_use); i++) {
         if (!never_reset_sdio[i]) {
+            if (slot_in_use[i]) {
+                sdmmc_host_deinit_slot(i);
+            }
             slot_in_use[i] = false;
         }
     }
-    if (!slot_in_use[0] && !slot_in_use[1] && host_initialized) {
-        sdmmc_host_deinit();
-        host_initialized = false;
-    }
 
     return;
 }
diff --git a/ports/espressif/common-hal/wifi/Radio.c b/ports/espressif/common-hal/wifi/Radio.c
index c07e1a2d14e..cf5bedb95eb 100644
--- a/ports/espressif/common-hal/wifi/Radio.c
+++ b/ports/espressif/common-hal/wifi/Radio.c
@@ -25,7 +25,7 @@
 #include "common-hal/socketpool/__init__.h"
 
 #include "components/esp_netif/include/esp_netif_net_stack.h"
-#include "components/esp_wifi/include/esp_wifi.h"
+#include "esp_wifi.h"
 #include "soc/soc_caps.h"
 #include "components/lwip/include/apps/ping/ping_sock.h"
 #include "lwip/sockets.h"
diff --git a/ports/espressif/common-hal/wifi/ScannedNetworks.c b/ports/espressif/common-hal/wifi/ScannedNetworks.c
index 0a87d3ab342..2beb6b754a3 100644
--- a/ports/espressif/common-hal/wifi/ScannedNetworks.c
+++ b/ports/espressif/common-hal/wifi/ScannedNetworks.c
@@ -17,7 +17,7 @@
 #include "shared-bindings/wifi/Radio.h"
 #include "shared-bindings/wifi/ScannedNetworks.h"
 
-#include "components/esp_wifi/include/esp_wifi.h"
+#include "esp_wifi.h"
 #include "soc/soc_caps.h"
 
 static void wifi_scannednetworks_done(wifi_scannednetworks_obj_t *self) {
diff --git a/ports/espressif/common-hal/wifi/__init__.c b/ports/espressif/common-hal/wifi/__init__.c
index bfee50ffe93..59172b17851 100644
--- a/ports/espressif/common-hal/wifi/__init__.c
+++ b/ports/espressif/common-hal/wifi/__init__.c
@@ -17,7 +17,7 @@
 #include "py/mpstate.h"
 #include "py/runtime.h"
 
-#include "components/esp_wifi/include/esp_wifi.h"
+#include "esp_wifi.h"
 
 #include "components/heap/include/esp_heap_caps.h"
 
@@ -40,6 +40,11 @@ wifi_radio_obj_t common_hal_wifi_radio_obj;
 
 #include "esp_ipc.h"
 
+#ifdef CONFIG_ESP_HOSTED_ENABLED
+#include "esp_hosted.h"
+#include "common-hal/microcontroller/Pin.h"
+#endif
+
 #ifdef CONFIG_IDF_TARGET_ESP32
 #include "nvs_flash.h"
 #endif
@@ -457,6 +462,19 @@ void common_hal_wifi_init(bool user_initiated) {
     if (!wifi_ever_inited) {
         ESP_ERROR_CHECK(esp_event_loop_create_default());
         ESP_ERROR_CHECK(esp_netif_init());
+        #ifdef CONFIG_ESP_HOSTED_ENABLED
+        const uint8_t pins[] = {
+            CONFIG_ESP_HOSTED_SDIO_PIN_CLK, CONFIG_ESP_HOSTED_SDIO_PIN_CMD,
+            CONFIG_ESP_HOSTED_SDIO_PIN_D0, CONFIG_ESP_HOSTED_SDIO_PIN_D1,
+            CONFIG_ESP_HOSTED_SDIO_PIN_D2, CONFIG_ESP_HOSTED_SDIO_PIN_D3,
+            CONFIG_ESP_HOSTED_SDIO_GPIO_RESET_SLAVE,
+        };
+        for (size_t i = 0; i < MP_ARRAY_SIZE(pins); i++) {
+            claim_pin_number(pins[i]);
+            never_reset_pin_number(pins[i]);
+        }
+        ESP_ERROR_CHECK(esp_hosted_init());
+        #endif
         wifi_ever_inited = true;
     }
 
diff --git a/ports/espressif/esp-hosted b/ports/espressif/esp-hosted
new file mode 160000
index 00000000000..dd0176e5fc9
--- /dev/null
+++ b/ports/espressif/esp-hosted
@@ -0,0 +1 @@
+Subproject commit dd0176e5fc959d79b306f6677a2f878123c58e9a
diff --git a/ports/espressif/esp-idf b/ports/espressif/esp-idf
index 0687c505dad..29d36039e56 160000
--- a/ports/espressif/esp-idf
+++ b/ports/espressif/esp-idf
@@ -1 +1 @@
-Subproject commit 0687c505dad1ace31c664de2c5494c13c08b0b1d
+Subproject commit 29d36039e564db6df505d0582b94b230a17e63f3
diff --git a/ports/espressif/mpconfigport.mk b/ports/espressif/mpconfigport.mk
index 87ba43d1ebf..b635f193e1c 100644
--- a/ports/espressif/mpconfigport.mk
+++ b/ports/espressif/mpconfigport.mk
@@ -371,10 +371,12 @@ CIRCUITPY_AUDIOIO = 0
 # MII is available on these targets with EMAC hardware.
 CIRCUITPY_MII ?= 1
 
-# No wifi
-# TODO: Support ESP32-C6 coprocessor on some boards.
+# Optional ESP-Hosted Wi-Fi coprocessor.
+CIRCUITPY_ESP_HOSTED ?= 0
+CIRCUITPY_ESPNOW = 0
 CIRCUITPY_BLEIO_NATIVE = 0
-CIRCUITPY_WIFI = 0
+CIRCUITPY_WIFI = $(CIRCUITPY_ESP_HOSTED)
+CIRCUITPY_SSL = $(CIRCUITPY_ESP_HOSTED)
 
 # Second stage bootloader doesn't work when the factory partition is empty due to
 # UF2 missing.
diff --git a/tools/ci_fetch_deps.py b/tools/ci_fetch_deps.py
index c36acc26a73..c50746651b6 100644
--- a/tools/ci_fetch_deps.py
+++ b/tools/ci_fetch_deps.py
@@ -157,6 +157,16 @@ def fetch(where):
             cwd=mbedtls,
         )
 
+    # ESP-Hosted keeps the protobuf-c runtime in a nested submodule.
+    esp_hosted = TOP / "ports" / "espressif" / "esp-hosted"
+    if (esp_hosted / ".gitmodules").exists():
+        depth_maybe = "" if clone_supports_filter else "--depth 1"
+        run(
+            "Init esp-hosted nested submodules",
+            f"git submodule update --init {filter_maybe} {depth_maybe} common/protobuf-c",
+            cwd=esp_hosted,
+        )
+
 
 def set_output(name, value):
     if "GITHUB_OUTPUT" in os.environ: