diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4d7db57d0e..0d7494d3a5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -161,6 +161,8 @@ jobs:
         - "uchip"
         - "ugame10"
         - "winterbloom_sol"
+        - "xinabox_cc03"
+        - "xinabox_cs11"
 
     steps:
     - name: Set up Python 3.5
diff --git a/.gitmodules b/.gitmodules
index 98252c2afa..da2360cb72 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -102,6 +102,9 @@
 [submodule "ports/cxd56/spresense-exported-sdk"]
 	path = ports/cxd56/spresense-exported-sdk
 	url = https://github.com/sonydevworld/spresense-exported-sdk.git
+[submodule "frozen/Adafruit_CircuitPython_SD"]
+	path = frozen/Adafruit_CircuitPython_SD
+	url = https://github.com/adafruit/Adafruit_CircuitPython_SD.git
 [submodule "lib/mp3"]
 	path = lib/mp3
 	url = https://github.com/adafruit/Adafruit_MP3
diff --git a/frozen/Adafruit_CircuitPython_SD b/frozen/Adafruit_CircuitPython_SD
new file mode 160000
index 0000000000..5ad33e4ca2
--- /dev/null
+++ b/frozen/Adafruit_CircuitPython_SD
@@ -0,0 +1 @@
+Subproject commit 5ad33e4ca219f0e216beab439cfa259cde32016c
diff --git a/ports/atmel-samd/boards/xinabox_cc03/board.c b/ports/atmel-samd/boards/xinabox_cc03/board.c
new file mode 100644
index 0000000000..770bc82593
--- /dev/null
+++ b/ports/atmel-samd/boards/xinabox_cc03/board.c
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+#include "mpconfigboard.h"
+#include "hal/include/hal_gpio.h"
+
+void board_init(void)
+{
+}
+
+bool board_requests_safe_mode(void) {
+    return false;
+}
+
+void reset_board(void) {
+}
diff --git a/ports/atmel-samd/boards/xinabox_cc03/mpconfigboard.h b/ports/atmel-samd/boards/xinabox_cc03/mpconfigboard.h
new file mode 100644
index 0000000000..4690ed3416
--- /dev/null
+++ b/ports/atmel-samd/boards/xinabox_cc03/mpconfigboard.h
@@ -0,0 +1,24 @@
+#define MICROPY_HW_BOARD_NAME "XinaBox CC03"
+#define MICROPY_HW_MCU_NAME "samd21g18"
+
+#define MICROPY_PORT_A        (0)
+#define MICROPY_PORT_B        (0)
+#define MICROPY_PORT_C        (0)
+
+#define CIRCUITPY_INTERNAL_NVM_SIZE 256
+
+#define BOARD_FLASH_SIZE (0x00040000 - 0x2000 - 0x010000 - CIRCUITPY_INTERNAL_NVM_SIZE)
+
+#define DEFAULT_I2C_BUS_SCL (&pin_PA23)
+#define DEFAULT_I2C_BUS_SDA (&pin_PA22)
+
+#define DEFAULT_SPI_BUS_SCK (&pin_PB11)
+#define DEFAULT_SPI_BUS_MOSI (&pin_PB10)
+#define DEFAULT_SPI_BUS_MISO (&pin_PA12)
+
+#define DEFAULT_UART_BUS_RX (&pin_PA11)
+#define DEFAULT_UART_BUS_TX (&pin_PA10)
+
+// USB is always used internally so skip the pin objects for it.
+#define IGNORE_PIN_PA24     1
+#define IGNORE_PIN_PA25     1
diff --git a/ports/atmel-samd/boards/xinabox_cc03/mpconfigboard.mk b/ports/atmel-samd/boards/xinabox_cc03/mpconfigboard.mk
new file mode 100644
index 0000000000..941d88b459
--- /dev/null
+++ b/ports/atmel-samd/boards/xinabox_cc03/mpconfigboard.mk
@@ -0,0 +1,26 @@
+LD_FILE = boards/samd21x18-bootloader.ld
+USB_VID = 0x04D8
+USB_PID = 0xEC72
+USB_PRODUCT = "XinaBox CC03"
+USB_MANUFACTURER = "XinaBox"
+
+CHIP_VARIANT = SAMD21G18A
+CHIP_FAMILY = samd21
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = MPZ
+CIRCUITPY_SMALL_BUILD = 1
+
+SUPEROPT_GC = 0
+
+# Make room for frozen libs.
+CIRCUITPY_FREQUENCYIO = 0
+CIRCUITPY_ANALOGIO=0
+CIRCUITPY_NEOPIXEL_WRITE=0
+CIRCUITPY_PULSEIO=0
+CIRCUITPY_ROTARYIO=0
+CIRCUITPY_TOUCHIO_USE_NATIVE=0
+CIRCUITPY_TOUCHIO=0
+
+# Include these Python libraries in firmware.
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_BusDevice
diff --git a/ports/atmel-samd/boards/xinabox_cc03/pins.c b/ports/atmel-samd/boards/xinabox_cc03/pins.c
new file mode 100644
index 0000000000..f7c035d0b2
--- /dev/null
+++ b/ports/atmel-samd/boards/xinabox_cc03/pins.c
@@ -0,0 +1,15 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_PA11) },
+    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PA10) },
+    { MP_ROM_QSTR(MP_QSTR_RED), MP_ROM_PTR(&pin_PA05) },
+    { MP_ROM_QSTR(MP_QSTR_GREEN), MP_ROM_PTR(&pin_PA06) },
+    { MP_ROM_QSTR(MP_QSTR_BLUE), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PA22) },
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PA23) },
+    { MP_ROM_QSTR(MP_QSTR_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_global_dict_table);
diff --git a/ports/atmel-samd/boards/xinabox_cs11/board.c b/ports/atmel-samd/boards/xinabox_cs11/board.c
new file mode 100644
index 0000000000..770bc82593
--- /dev/null
+++ b/ports/atmel-samd/boards/xinabox_cs11/board.c
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "boards/board.h"
+#include "mpconfigboard.h"
+#include "hal/include/hal_gpio.h"
+
+void board_init(void)
+{
+}
+
+bool board_requests_safe_mode(void) {
+    return false;
+}
+
+void reset_board(void) {
+}
diff --git a/ports/atmel-samd/boards/xinabox_cs11/mpconfigboard.h b/ports/atmel-samd/boards/xinabox_cs11/mpconfigboard.h
new file mode 100644
index 0000000000..9699568dad
--- /dev/null
+++ b/ports/atmel-samd/boards/xinabox_cs11/mpconfigboard.h
@@ -0,0 +1,24 @@
+#define MICROPY_HW_BOARD_NAME "XinaBox CS11"
+#define MICROPY_HW_MCU_NAME "samd21g18"
+
+#define MICROPY_PORT_A        (0)
+#define MICROPY_PORT_B        (0)
+#define MICROPY_PORT_C        (0)
+
+#define CIRCUITPY_INTERNAL_NVM_SIZE 256
+
+#define BOARD_FLASH_SIZE (0x00040000 - 0x2000 - 0x010000 - CIRCUITPY_INTERNAL_NVM_SIZE)
+
+#define DEFAULT_I2C_BUS_SCL (&pin_PA23)
+#define DEFAULT_I2C_BUS_SDA (&pin_PA22)
+
+#define DEFAULT_SPI_BUS_SCK (&pin_PB11)
+#define DEFAULT_SPI_BUS_MOSI (&pin_PB10)
+#define DEFAULT_SPI_BUS_MISO (&pin_PA12)
+
+#define DEFAULT_UART_BUS_RX (&pin_PA11)
+#define DEFAULT_UART_BUS_TX (&pin_PA10)
+
+// USB is always used internally so skip the pin objects for it.
+#define IGNORE_PIN_PA24     1
+#define IGNORE_PIN_PA25     1
diff --git a/ports/atmel-samd/boards/xinabox_cs11/mpconfigboard.mk b/ports/atmel-samd/boards/xinabox_cs11/mpconfigboard.mk
new file mode 100644
index 0000000000..5c418d312c
--- /dev/null
+++ b/ports/atmel-samd/boards/xinabox_cs11/mpconfigboard.mk
@@ -0,0 +1,29 @@
+LD_FILE = boards/samd21x18-bootloader.ld
+USB_VID = 0x04D8
+USB_PID = 0xEC75
+USB_PRODUCT = "XinaBox CS11"
+USB_MANUFACTURER = "XinaBox"
+
+CHIP_VARIANT = SAMD21G18A
+CHIP_FAMILY = samd21
+
+INTERNAL_FLASH_FILESYSTEM = 1
+LONGINT_IMPL = MPZ
+CIRCUITPY_SMALL_BUILD = 1
+
+SUPEROPT_GC = 0
+
+# Make room for frozen libs.
+CIRCUITPY_FREQUENCYIO = 0
+CIRCUITPY_ANALOGIO=0
+CIRCUITPY_NEOPIXEL_WRITE=0
+CIRCUITPY_PULSEIO=0
+CIRCUITPY_ROTARYIO=0
+CIRCUITPY_TOUCHIO_USE_NATIVE=0
+CIRCUITPY_TOUCHIO=0
+CIRCUITPY_USB_MIDI=0
+CIRCUITPY_RTC=0
+
+# Include these Python libraries in firmware.
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_BusDevice
+FROZEN_MPY_DIRS += $(TOP)/frozen/Adafruit_CircuitPython_SD
diff --git a/ports/atmel-samd/boards/xinabox_cs11/pins.c b/ports/atmel-samd/boards/xinabox_cs11/pins.c
new file mode 100644
index 0000000000..f0ef0da674
--- /dev/null
+++ b/ports/atmel-samd/boards/xinabox_cs11/pins.c
@@ -0,0 +1,20 @@
+#include "shared-bindings/board/__init__.h"
+
+STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
+    { MP_ROM_QSTR(MP_QSTR_RX), MP_ROM_PTR(&pin_PA11) },
+    { MP_ROM_QSTR(MP_QSTR_TX), MP_ROM_PTR(&pin_PA10) },
+    { MP_ROM_QSTR(MP_QSTR_CS), MP_ROM_PTR(&pin_PA09) },
+    { MP_ROM_QSTR(MP_QSTR_ALERT), MP_ROM_PTR(&pin_PA07) },
+    { MP_ROM_QSTR(MP_QSTR_RED), MP_ROM_PTR(&pin_PA16) },
+    { MP_ROM_QSTR(MP_QSTR_GREEN), MP_ROM_PTR(&pin_PA19) },
+    { MP_ROM_QSTR(MP_QSTR_BLUE), MP_ROM_PTR(&pin_PA17) },
+    { MP_ROM_QSTR(MP_QSTR_SDA), MP_ROM_PTR(&pin_PA22) },
+    { MP_ROM_QSTR(MP_QSTR_SCL), MP_ROM_PTR(&pin_PA23) },
+    { MP_ROM_QSTR(MP_QSTR_SCK), MP_ROM_PTR(&pin_PB11) },
+    { MP_ROM_QSTR(MP_QSTR_MOSI), MP_ROM_PTR(&pin_PB10) },
+    { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_PA12) },
+    { MP_ROM_QSTR(MP_QSTR_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_global_dict_table);