=========================
Detailed Platform Support
=========================

**Details**. The details, caveats and fine print follow. For even more
information see the *README* files that can be found
`here <https://cwiki.apache.org/confluence/display/NUTTX/README+Files>`__.

Linux User Mode Simulation
==========================

A user-mode port of NuttX to the x86 Linux/Cygwin platform is available.
The purpose of this port is primarily to support OS feature development.

ARM7TDMI
========

TI TMS320-C5471
---------------

(also called **C5471** or **TMS320DA180** or **DA180**)

NuttX operates on the ARM7 of this dual core processor. This port uses
the `Spectrum Digital <http://www.spectrumdigital.com/>`__ evaluation
board with a GNU arm-nuttx-elf toolchain\* under Linux or Cygwin.

NXP LPC214x
-----------

Support is provided for the NXP LPC214x family of
processors. In particular, support is provided for (1) the mcu123.com
lpc214x evaluation board (LPC2148) and (1) the The0.net ZPA213X/4XPA
development board (with the The0.net UG-2864AMBAG01 OLED) This port also
used the GNU arm-nuttx-elf toolchain\* under Linux or Cygwin.

NXP LPC2378
-----------

Support is provided for the NXP LPC2378 MCU. In particular,
support is provided for the Olimex-LPC2378 development board. This port
was contributed by Rommel Marcelo is was first released in NuttX-5.3.
This port also used the GNU arm-nuttx-elf toolchain\* under Linux or
Cygwin.

STMicro STR71x
--------------

Support is provided for the STMicro STR71x family of
processors. In particular, support is provided for the Olimex STR-P711
evaluation board. This port also used the GNU arm-nuttx-elf toolchain\*
under Linux or Cygwin.

ARM920T
=======

NXP/Freescale i.MX1
-------------------

Or MC9328MX1 – This port uses the Freescale MX1ADS
development board with a GNU arm-nuttx-elf toolchain\* under either
Linux or Cygwin.

ARM926EJS
=========

TI TMS320-DM320
---------------

(also called **DM320**)

NuttX operates on the ARM9 of
this dual core processor. This port uses the Neuros OSD
with a GNU arm-nuttx-elf toolchain\* under Linux or Cygwin. The port was
performed using the OSD v1.0, development board.

NXP LPC3131
-----------

Two boards based on the NXP LPC3131 are supported:

-  First, a port for the NXP LPC3131
   on the Embedded Artists EA3131
   development board was first released in NuttX-5.1 (but was not
   functional until NuttX-5.2).

-  A second port to the NXP LPC3131
   on the `Olimex
   LPC-H3131 <https://www.olimex.com/Products/ARM/NXP/LPC-H3131/>`__
   development board was added in NuttX-6.32.

NXP LPC315x
-----------

Support for the NXP LPC315x
family has been incorporated into the code base as of NuttX-6.4. Support
was added for the Embedded Artists EA3152 board in NuttX-6.11.

Other ARMv4
===========

Moxa NP51x0
-----------

A port to the Moxa NP51x0 series of 2-port advanced
RS-232/422/485 serial device servers was contributed by Anton D.
Kachalov in NuttX-7.11. This port includes :ref:`NSH <nsh>`
configuration with support for the Faraday FTMAC100 Ethernet MAC Driver.

ARM1176JZ
=========

Broadcom BCM2708
----------------

Very basic support for the Broadcom BCM2708 was released with NuttX-7.23.

Raspberry Pi Zero. This support was provided for the Raspberry Pi Zero
which is based on the BCM2835. Basic logic is in place but the port is
incomplete and completely untested as of the NuttX-7.23 released. Refer
to the NuttX board
`README <https://bitbucket.org/patacongo/obsoleted/src/master/nuttx/boards/pizero/README.txt>`__
file for further information.

**Obsoleted:**: Support for the Raspberry Pi Zero was never completed.
The incomplete port along with all support for the BCM2708 was removed
from the repository with the NuttX-7.28 release but can still be be
found in the *Obsoleted* repository.

ARM Cortex-A5
=============

Microchip SAMA5D2
-----------------

-  **Microchip SAMA5D2 Xplained Ultra development board**. This is the port
   of NuttX to the Microchip SAMA5D2 Xplained Ultra development board. This
   board features the Microchip SAMA5D27 microprocessor.
   See https://www.microchip.com/Developmenttools/ProductDetails/ATSAMA5D2C-XULT

- **Groboards Giant Board**. This is the port of NuttX to the Groboards
  Giant Board board. This board features the Microchip SAMA5D27C-D1G.
  See http://groboards.com/giant-board.

Microchip SAMA5D3
-----------------

There are ports to two Microchip SAMA5D3 boards:

-  **Microchip SAMA5D3\ x-EK development boards**. This is the port of NuttX
   to the Microchip SAMA5D3\ *x*-EK development boards (where *x*\ =1,3,4,
   or 5). These boards feature the Microchip SAMA5D3\ *x* microprocessors.
   Four different SAMA5D3\ *x*-EK kits are available

   -  SAMA5D31-EK with the
      `ATSAMA5D31 <http://www.atmel.com/devices/sama5d31.aspx>`__
   -  SAMA5D33-EK with the
      `ATSAMA5D33 <http://www.atmel.com/devices/sama5d33.aspx>`__
   -  SAMA5D34-EK with the
      `ATSAMA5D34 <http://www.atmel.com/devices/sama5d34.aspx>`__
   -  SAMA5D35-EK with the
      `ATSAMA5D35 <http://www.atmel.com/devices/sama5d35.aspx>`__

   The each kit consist of an identical base board with different
   plug-in modules for each CPU. All four boards are supported by NuttX
   with a simple reconfiguration of the processor type.

   **STATUS**. Initial support for the SAMA5D3x-EK was released in
   NuttX-6.29. That initial support was minimal: There are simple test
   configurations that run out of internal SRAM and extended
   configurations that run out of the on-board NOR FLASH:

   -  A barebones NuttShell (:ref:`NSH <nsh>`) configuration
      that can be used as the basis for further application development.
   -  A full-loaded NuttShell (:ref:`NSH <nsh>`) configuration
      that demonstrates all of the SAMA5D3x features.

   The following support was added in NuttX 6.30:

   -  DMA support, and
   -  PIO interrupts,

   And drivers for

   -  SPI (with DMA support),
   -  AT25 Serial Flash,
   -  Two Wire Interface (TWI), and
   -  HSMCI memory cards.

   NuttX-6.30 also introduces full USB support:

   -  High speed device controller driver,
   -  OHCI (low- and full-speed) and
   -  EHCI (high-speed) host controller driver support.

   With NuttX-6.31, these additional drivers were added:

   -  A 10/100Base-T Ethernet (EMAC) driver,
   -  A 1000Base-T Ethernet (GMAC) driver,
   -  A Real Time Clock (RTC) driver and integrated with the NuttX
      system time logic
   -  ``/dev/random`` using the SAMA5D3x True Random Number Generator
      (TRNG),
   -  A Watchdog Timer (WDT) driver,
   -  A Timer/Counter (TC) library with interface that make be used by
      other drivers that need timer support,
   -  An ADC driver that can collect multiple samples using the
      sequencer, can be trigger by a timer/counter, and supports DMA
      data transfers,
   -  A touchscreen driver based on the special features of the SAMA5D3
      ADC peripheral, An LCD controller (LCDC) frame buffer driver, and
   -  A CAN driver (Testing of the CAN has been delayed because of
      cabling issues).

   Additional board configurations were added to test and demonstrate
   these new drivers including new graphics and NxWM configurations.

   These drivers were added in NuttX-6.32:

   -  A PWM driver with DMA support
   -  An SSC-based I2S driver
   -  Support for Programmable clock outputs
   -  NAND support including support for the PMECC hardware ECC and for
      DMA transfers.

   DBGU support was added in NuttX-7.2 (primarily for the SAMA5D3
   Xplained board).

   NuttX-7.4 added support for the on-board WM8904 CODEC chip and for
   *Tickless* operation.

   Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/sama5/sama5d3x-ek/README.txt>`__
   file for further information.

**Microchip SAMA5D3 Xplained development board** This is the port of NuttX
to the Microchip SAMA5D3 Xplained development board. The board features the
Microchip SAMA5D36 microprocessor. See the `Microchip
Website <http://www.atmel.com/devices/sama5d36.aspx>`__ for additional
information about this board.

**STATUS**. This port is complete as of this writing and ready for
general use. The basic port is expected to be simple because of the
similarity to the SAMAD3\ *x*-EK boards and is available in the NuttX
7.2 release.

Most of the drivers and capabilities of the SAMA5D3x-EK boards can be
used with the SAMA5D3 Xplained board. The primary difference between the
ports is that the SAMA5D3x-EK supports NOR FLASH and NuttX can be
configured to boot directly from NOR FLASH. The SAMA5D3 Xplained board
does not have NOR FLASH and, as a consequence NuttX must boot into SDRAM
with the help of U-Boot.

Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/sama5/sama5d3-xplained/README.txt>`__
file for further information.

Microchip SAMA5D4
-----------------

There is a port in progress on one Microchip SAMA5D4 board:

-  **Microchip SAMA5D4-EK/MB development boards** This is the port of NuttX
   to the Microchip SAMA5D4-MB Rev C. development board (which should be
   compatible with the SAMA5D4-EK). These boards feature the Microchip
   SAMA5D44 microprocessors with compatibility with most of the SAMA5D3
   peripherals.

   **STATUS**. At the time of the release of NuttX-7.3, the basic port
   for the SAMA5D4-MB was complete. The board had basic functionality.
   But full functionality was not available until NuttX-7.4. In
   NuttX-7.4 support was added for the L2 cache, many security features,
   XDMAC, HSMCI and Ethernet integrated with XDMAC, the LCDC, TWI, SSC,
   and most of the existing SAMA5 drivers. Timers were added to support
   *Tickless* operation. The TM7000 LCDC with the maXTouch multi-touch
   controller are also fully support in a special NxWM configuration for
   that larger display. Support for a graphics media player is included
   (although there were issues with the WM8904 audio CODEC on my board).
   An SRAM bootloader was also included. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/sama5/sama5d4-ek/README.txt>`__
   file for current status.

**Development Environments:** 1) Linux with native Linux GNU toolchain,
2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS with Windows
native toolchain, or 4) Native Windows. All testing has been performed
with the CodeSourcery toolchain (GCC version 4.7.3) in the Cygwin
environment under Windows.

ARM Cortex-A8
=============

Allwinner A10
-------------

These following boards are based on the Allwinner A10
have are supported by NuttX:

-  **pcDuino v1**. A port of NuttX to the pcDuino v1 board was first
   released in NuttX-6.33. See http://www.pcduino.com/ for information
   about pcDuino Lite, v1, and v2 boards. These boards are based around
   the Allwinner A10 Cortex-A8 CPU. This port was developed on the v1
   board, but the others may be compatible:

   Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/a1x/pcduino-a10/README.txt>`__
   file for further information.

   **STATUS**. This port was an experiment was was not completely
   developed. This configuration builds and runs an NuttShell (NSH), but
   only if a patch to work around some issues is applied. While not
   ready for "prime time", the pcDuino port is functional and could the
   basis for a more extensive development. There is, at present, no work
   in progress to extend this port, however.

TI/Sitara AM335x
----------------

These following boards are based on the TI/Sitara
AM335x are supported by NuttX:

-  **Beaglebone Black**. A port of NuttX to the Beaglebone Black board
   was first released in NuttX-7.28. This port was contributed by Petro
   Karashchenko. This board is based on the TI/Sitara AM3358 Cortex-A8
   CPU running 1GHz.

   -  **NuttX-7.28**. This initial port in NuttX-7.28 is very sparse.
      While not ready for prodcution use, the Beaglebone Black port is
      functional and will be the basis for a more extensive development.
      Additional work in progress to extend this port and more capable
      is anticipated in NuttX-7.29.
   -  **NuttX-9.0** CAN support was added. Clock Configuration was
      added.
   -  **NuttX-7.31**. An LCD driver was added in NuttX-7.31.

   Refer to the Beaglebone Black board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/am335x/beaglebone-black/README.txt>`__
   file for further, up-to-date information.

ARM Cortex-A53
==============

Allwinner A64
-------------

The basic port has been completed for the following Allwinner A64 board:

-  **PINE64 PinePhone**: Refer to :doc:`PINE64 PinePhone </platforms/arm/a64/boards/pinephone/index>` for further information.

ARM Cortex-A9
=============

NXP/Freescale i.MX6
-------------------

The basic port has been completed for the following i.MX6 board:

-  **Sabre-6Quad**. This is a port to the NXP/Freescale Sabre-6Quad
   board. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/imx6/sabre-6quad/README.txt>`__
   file for further information.

   **STATUS:** The basic, minimal port is code complete and introduced
   in NuttX-7.15, but had not yet been tested at that time due to the
   inavailability of hardware. This basic port was verified in the
   NuttX-7.16 release, however. The port is still minimal and more
   device drivers are needed to make the port usable.

   Basic support of NuttX running in SMP mode on the i.MX6Q was also
   accomplished in NuttX-7.16. However, there are still known issues
   with SMP support on this platform as described in the
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/imx6/sabre-6quad/README.txt>`__
   file for the board.

ARM Cortex-R4
=============

TI/Hercules TMS570LS04xx
------------------------

A port is available for the Texas Instruments
Hercules TMS570LS04x/03x LaunchPad Evaluation Kit (*LAUNCHXL-TMS57004*)
featuring the Hercules TMS570LS0432PZ chip.

TI/Hercules TMS570LS31xx
------------------------

Architecture support for the TMS570LS3137ZWT
part was added in NuttX 7.25 by Ivan Ucherdzhiev. Ivan also added
support for the TI Hercules TMS570LS31x USB Kit.

ARM Cortex-M0/M0+
=================

nuvoTon NUC120
--------------

This is a port of NuttX to the nuvoTon NuTiny-SDK-NUC120
that features the NUC120LE3AN MCU.

**STATUS**. Initial support for the NUC120 was released in NuttX-6.26.
This initial support is very minimal: There is a NuttShell
(:ref:`NSH <nsh>`) configuration that might be the basis for an
application development. As of this writing, more device drivers are
needed to make this a more complete port. Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/nuc1xx/nutiny-nuc120/README.txt>`__
file for further information.

**Memory Usage**. For a full-featured RTOS such as NuttX, providing
support in a usable and meaningful way within the tiny memories of the
NUC120 demonstrates the scalability of NuttX. The NUC120LE2AN comes in a
48-pin package and has 128KB FLASH and 16KB of SRAM. When running the
NSH configuration (itself a full up application), there is still more
than 90KB of FLASH and 10KB or SRAM available for further application
development).

Static memory usage can be shown with ``size`` command:

NuttX, the NSH application, and GCC libraries use 34.2KB of FLASH
leaving 93.8KB of FLASH (72%) free from additional application
development. Static SRAM usage is about 1.2KB (<4%) and leaves 14.8KB
(86%) available for heap at runtime. SRAM usage at run-time can be shown
with the NSH ``free`` command:

You can see that 10.0KB (62%) is available for further application
development.

**Development Environments:** 1) Linux with native Linux GNU toolchain,
2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS with Windows
native toolchain, or 4) Native Windows. A DIY toolchain for Linux or
Cygwin is provided by the NuttX
`buildroot <https://bitbucket.org/nuttx/buildroot/downloads/>`__
package.

NXP/FreeScale KL25Z
-------------------

There are two board ports for the KL25Z parts:

**Freedom KL25Z**. This is a port of NuttX to the Freedom KL25Z board
that features the MKL25Z128 Cortex-M0+ MCU, 128KB of FLASH and 16KB of
SRAM. See the
`Freescale <http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=FRDM-KL25Z&tid=vanFRDM-KL25Z>`__
website for further information about this board.

**PJRC Teensy-LC**. This is a port of NuttX to the PJRC Teensy-LC board
that features the MKL25Z64 Cortex-M0+ MCU, 64KB of FLASH and 8KB of
SRAM. The Teensy LC is a DIP style breakout board for the MKL25Z64 and
comes with a USB based bootloader. See the
`Freescale <http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=FRDM-KL25Z&tid=vanFRDM-KL25Z>`__
website for further information about this board.

NXP/FreeScale KL26Z
-------------------

This is a port of NuttX to the Freedom KL25Z
board that features the MK26Z128VLH4 Cortex-M0+ MCU, 128KB of FLASH and
16KB of SRAM. See the
`Freescale <http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=FRDM-KL26Z&tid=vanFRDM-KL26Z>`__
website for further information about this board.

Microchip SAMD20
----------------

The port of NuttX to the Microchip SAMD20-Xplained Pro
development board. This board features the ATSAMD20J18A MCU (Cortex-M0+
with 256KB of FLASH and 32KB of SRAM).

Microchip SAMD21
----------------

There two boards supported for the SAMD21:

#. The port of NuttX to the Microchip SAMD21-Xplained Pro development board
   added in NuttX-7.11, and
#. The port of NuttX to the Arduino-M0 contributed by Alan Carvalho de
   Assis in NuttX-8.2. The initial release included *nsh* and *usbnsh*
   configurations.

Microchip SAML21
----------------

The port of NuttX to the Microchip SAML21-Xplained Pro
development board. This board features the ATSAML21J18A MCU (Cortex-M0+
with 256KB of FLASH and 32KB of SRAM).

NXP LPC11xx
-----------

Support is provided for the NXP LPC11xx family of
processors. In particular, support is provided for LPCXpresso LPC1115
board. This port was contributed by Alan Carvalho de Assis.

NXP S32K11x
-----------

Support is provided for the NXP S32K11x family of
processors and, in particular, the S32K118EVB development board.

ARM Cortex-M3
=============

TI/Stellaris LM3S6432
---------------------

This is a port of NuttX to the Stellaris RDK-S2E
Reference Design Kit and the MDL-S2E Ethernet to Serial module
(contributed by Mike Smith).

TI/Stellaris LM3S6432S2E
------------------------

This port uses Serial-to-Ethernet Reference
Design Kit and has
similar support as for the other Stellaris family members. A
configuration is available for the NuttShell (NSH) (see :ref:`NSH <nsh>`). The NSH
configuration including networking support with a Telnet NSH console.
This port was contributed by Mike Smith.

TI/Stellaris LM3S6918
---------------------

This port uses the
`Micromint <http://www.micromint.com/>`__ Eagle-100 development board
with a GNU arm-nuttx-elf toolchain\* under either Linux or Cygwin.

**Development Environments:** 1) Linux with native Linux GNU toolchain,
2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS with Windows
native toolchain (CodeSourcery or devkitARM), or 4) Native Windows. A
DIY toolchain for Linux or Cygwin is provided by the NuttX
`buildroot <https://bitbucket.org/nuttx/buildroot/downloads/>`__
package.

TI/Stellaris LM3S6965
---------------------

This port uses the Stellaris LM3S6965 Ethernet
Evaluation Kit with a GNU arm-nuttx-elf toolchain\* under either Linux
or Cygwin.

**Development Environments:** See the Eagle-100 LM3S6918 above.

TI/Stellaris LM3S8962
---------------------

This port uses the Stellaris EKC-LM3S8962
Ethernet+CAN Evaluation Kit with a GNU arm-nuttx-elf toolchain\* under
either Linux or Cygwin. Contributed by Larry Arnold.

TI/Stellaris LM3S9B92
---------------------

Architectural support for the LM3S9B92 was
contributed by Lwazi Dube in NuttX 7.28. No board support for boards
using the LM3S9B92 are currently available.

TI/Stellaris LM3S9B96
---------------------

Header file support was contributed by Tiago
Maluta for this part. Jose Pablo Rojas V. is used those header file
changes to port NuttX to the TI/Stellaris EKK-LM3S9B96. That port was
available in the NuttX-6.20 release. Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/tiva/ekk-lm3s9b96/README.txt>`__
file for further information.

TI/SimpleLink CC13x0
--------------------

Basic, unverified architectural support for the
CC13x0 was added in NuttX-7.28. This is a work in progress and, with any
luck, a fully verified port will be available in NuttX-7.29.

SiLabs EFM32 Gecko
------------------

This is a port for the Silicon Laboratories' EFM32
*Gecko* family. Board support is available for the following:

#. **SiLabs EFM32 Gecko Starter Kit (EFM32-G8XX-STK)**. The Gecko
   Starter Kit features:

   -  EFM32G890F128 MCU with 128 kB flash and 16 kB RAM
   -  32.768 kHz crystal (LXFO) and 32 MHz crystal (HXFO)
   -  Advanced Energy Monitoring
   -  Touch slider
   -  4x40 LCD
   -  4 User LEDs
   -  2 pushbutton switches
   -  Reset button and a switch to disconnect the battery.
   -  On-board SEGGER J-Link USB emulator
   -  ARM 20 pin JTAG/SWD standard Debug in/out connector

   **STATUS**. The basic port is verified and available now. This
   includes on-board LED and button support and a serial console
   available on LEUART0. A single configuration is available using the
   NuttShell NSH and the LEUART0 serial console. DMA and USART-based SPI
   supported are included, but not fully tested.

   Refer to the EFM32 Gecko Starter Kit
   `README.txt <https://github.com/apache/nuttx/blob/master/boards/arm/efm32/efm32-g8xx-stk/README.txt>`__
   file for further information.

#. **Olimex EFM32G880F120-STK**. This board features:

   -  EFM32G880F128 with 128 kB flash and 16 kB RAM
   -  32.768 kHz crystal (LXFO) and 32 MHz crystal (HXFO)
   -  LCD custom display
   -  DEBUG connector with ARM 2x10 pin layout for programming/debugging
      with ARM-JTAG-EW
   -  UEXT connector
   -  EXT extension connector
   -  RS232 connector and driver
   -  Four user buttons
   -  Buzzer

   **STATUS**. The board support is complete but untested because of
   tool-related issues. An OpenOCD compatible, SWD debugger would be
   required to make further progress in testing.

   Refer to the Olimex EFM32G880F120-STK
   `README.txt <https://github.com/apache/nuttx/blob/master/boards/arm/efm32/olimex-efm32g880f128-stk/README.txt>`__
   for further information.

SiLabs EFM32 Giant Gecko
------------------------

This is a port for the Silicon Laboratories'
EFM32 *Giant Gecko* family. This board features the EFM32GG990F1024 MCU
with 1 MB flash and 128 kB RAM.

Board support is available for the following:

-  **SiLabs EFM32 Giant Gecko Starter Kit t (EFM32GG-STK3700)**. The
   Gecko Starter Kit features:

   -  EFM32GG990F1024 MCU with 1 MB flash and 128 kB RAM
   -  32.768 kHz crystal (LXFO) and 48 MHz crystal (HXFO)
   -  32 MB NAND flash
   -  Advanced Energy Monitoring
   -  Touch slider
   -  8x20 LCD
   -  2 user LEDs
   -  2 user buttons
   -  USB interface for Host/Device/OTG
   -  Ambient light sensor and inductive-capacitive metal sensor
   -  EFM32 OPAMP footprint
   -  20 pin expansion header
   -  Breakout pads for easy access to I/O pins
   -  Power sources (USB and CR2032 battery)
   -  Backup Capacitor for RTC mode
   -  Integrated Segger J-Link USB debugger/emulator

   **STATUS**.

   -  The basic board support for the *Giant Gecko* was introduced int
      the NuttX source tree in NuttX-7.6. A verified configuration was
      available for the basic NuttShell (NSH) using LEUART0 for the
      serial console.
   -  Development of USB support is in started, but never completed.
   -  Reset Management Unit (RMU) was added Pierre-noel Bouteville in
      NuttX-7.7.

STMicro STM32 L152
------------------

(STM32L "EnergyLite" Line). Two boards are supported:

-  STM32L-Discovery. This is a port of NuttX to the STMicro
   STM32L-Discovery development board. The STM32L-Discovery board is
   based on the STM32L152RBT6 MCU (128KB FLASH and 16KB of SRAM).

   The STM32L-Discovery and STM32L152C DISCOVERY kits are functionally
   equivalent. The difference is the internal Flash memory size
   (STM32L152RBT6 with 128 Kbytes or STM32L152RCT6 with 256 Kbytes).
   Both boards feature:

   -  An ST-LINK/V2 embedded debug tool interface,
   -  LCD (24 segments, 4 commons),
   -  LEDs,
   -  Pushbuttons,
   -  A linear touch sensor, and
   -  Four touchkeys.

-  Nucleo-L152RE. Board support for the Nucleo-L152RE was contributed by
   Mateusz Szafoni in NuttX-7.28. Available configurations include NSH,
   ADC, and PWM.

**STATUS**. Initial support for the STM32L-Discovery was released in
NuttX-6.28. Addition (architecture-only) support for the STM32L152xC
family was added in NuttX-7.21. Support for the Nucleo-L152RE was added
in NuttX-7.28.

That initial STM32L-Discovery support included a configuration using the
NuttShell (:ref:`NSH <nsh>`) that might be the basis for an
application development. A driver for the on-board segment LCD is
included as well as an option to drive the segment LCD from an NSH
"built-in" command. Refer to the STM32L-Discovery board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/stm32ldiscovery/README.txt>`__
file for further information.

**Memory Usage**.

   REVISIT: These numbers are out of date. Current NuttX sizing might be
   somewhat larger.

For a full-featured RTOS such as NuttX, providing support in a usable
and meaningful way within the tiny memories of the STM32L152RBT6
demonstrates the scalability of NuttX. The STM32L152RBT6 comes in a
64-pin package and has 128KB FLASH and 16KB of SRAM.

Static memory usage can be shown with ``size`` command:

NuttX, the NSH application, and GCC libraries use 38.7KB of FLASH
leaving 89.3B of FLASH (70%) free from additional application
development. Static SRAM usage is about 1.2KB (<4%) and leaves 14.8KB
(86%) available for heap at runtime.

SRAM usage at run-time can be shown with the NSH ``free`` command:

You can see that 9.9KB (62%) of SRAM heap is still available for further
application development while NSH is running.

STMicro STM32 L15x/16x
----------------------

(STM32 L1 "EnergyLite" Medium+ Density Family).
Support for the STM32L152 and STM32L162 Medium+ density parts from Jussi
Kivilinna and Sami Pelkonen was included in NuttX-7.3, extending the
basic STM32L152x support. This is *architecture-only* support, meaning
that support for the boards with these chips is available, but no
support for any publicly available boards is included.

STMicro STM32 F0xx
------------------

(STM32 F0, ARM Cortex-M0). Support for the STM32 F0
family was contributed by Alan Carvalho de Assis in NuttX-7.21. There
are ports to three different boards in this repository:

-  **STM32F0-Discovery** This board features the STM32 2F051R8 and was
   used by Alan to produce the initial STM32 F0 port. However, its very
   limited 8KB SRAM makes this port unsuitable for for usages.
   Contributed by Alan Carvalho de Assis in NuttX-7.21.
-  **Nucleo-F072RB** With 16KB of SRAM the STM32 F072RB makes a much
   more usable platform.
-  **Nucleo-F091RC** With 32KB of SRAM the STM32 F091RC this board is a
   great match for NuttX. Contributed by Juha Niskanen in NuttX-7.21.

STMicro STM32 L0xx
------------------

(STM32 L0, ARM Cortex-M0). Support for the STM32 FL
family was contributed by Mateusz Sfafoni in NuttX-7.28. There are ports
to two different STM32 L0 boards in the repository:

  **B-L072Z-LRWAN1** Contributed byMateusz Sfafoni in NuttX-7.28.
  **Nucleo-L073RZ** Contributed byMateusz Sfafoni in NuttX-7.28.

STMicro STM32 G0xx
------------------

(STM32 G0, ARM Cortex-M0+). Support for the STM32 FL
family was contributed by Mateusz Sfafoni in NuttX-7.28. There are ports
to two different STM32 L0 boards in the repository:

-  **Nucleo-G071RB** Initial support for Nucleo-G071RB was contributed
   by Mateusz Szafoni in NuttX-7.31. Refer to the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32f0l0g0/nucleo-g071rb/README.txt>`__
   file for further information.
-  **Nucleo-G070RB** Contributed by Daniel Pereira Volpato. in
   NuttX-8.2. Refer to the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32f0l0g0/nucleo-g070rb/README.txt>`__
   file for further information.

**STATUS:** Status for the STM32F0xx, STM32L0xx, and STM32G0xx is shown
together since these parts share many drivers in common.

**NuttX-7.21**. In this initial release, the level of support for the
STM32 F0 family is minimal. Certainly enough is in place to support a
robust NSH configuration. There are also unverified I2C and USB device
drivers available in NuttX-7.21.

**NuttX-7.28** Added support for GPIO EXTI. From Mateusz Sfafoni.

**NuttX-7.29** Added an SPI driver. From Mateusz Sfafoni.

**NuttX-7.30** Added ADC and I2C drivers. From Mateusz Szafoni. Add AES
and RND drivers for the L0. From Mateusz Szafoni. Add support for HS148
for L0. From Mateusz Szafoni.

**NuttX-8.2** Added PWM and TIM drivers for the G0. From Daniel Pereira
Volpato.

**NuttX-9.0** Added I2C support for F0, L0 and G0.

STMicro STM32 F100x
-------------------

(STM32 F1 "Value Line"Family).

-  **Proprietary Boards** Chip support for these STM32 "Value Line"
   family was contributed by Mike Smith and users have reported that
   they have successful brought up NuttX on their proprietary boards
   using this logic.

-  **STM32VL-Discovery**. In NuttX-6.33, support for the STMicro
   STM32VL-Discovery board was contributed by Alan Carvalho de Assis.
   The STM32VL-Discovery board features an STM32F100RB MCU. Refer to the
   NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/stm32vldiscovery/README.txt>`__
   file for further information.

STMicro STM32 F102x
-------------------

Architecture support (only) for the STM32 F102 family
was contributed by the PX4 team in NuttX-7.7.

STMicro STM32 F103C4/C8
-----------------------

(STM32 F1 Low- and Medium-Density Family). There
are two ports available for this family:

-  One port is for "STM32 Tiny" development board. This board is
   available from several vendors on the net, and may be sold under
   different names. It is based on a STM32 F103C8T6 MCU, and is bundled
   with a nRF24L01 wireless communication module.

-  The other port is for a generic minimal STM32F103CBT6 "blue" board
   contributed by Alan Carvalho de Assis. Alan added support for
   numerous sensors, tone generators, user LEDs, and LCD support in
   NuttX 7.18.

**STATUS:**

STMicro STM32 F103x
-------------------

(STM32 F1 Family). Support for five board
configurations are available. MCU support includes all of the high
density and connectivity line families. Board supported is available
specifically for: STM32F103ZET6, STM32F103RET6, STM32F103VCT,
STM32F103VET6, STM32F103RBT6, and STM32103CBT6. Boards supported
include:

#. **STM3210E-EVAL**. A port for the `STMicro <http://www.st.com/>`__
   STM3210E-EVAL development board that features the STM32F103ZET6 MCU.
   Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/stm3210e-eval/README.txt>`__
   file for further information.

#. **HY-Mini STM32v board**. This board is based on the STM32F103VCT
   chip. Port contributed by Laurent Latil. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/hymini-stm32v/README.txt>`__
   file.

#. **The M3 Wildfire development board (STM32F103VET6), version 2**. See
   http://firestm32.taobao.com (the current board is version 3). Refer
   to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/fire-stm32v2/README.txt>`__
   file for further information.

#. **LeafLab's Maple and Maple Mini boards**. These boards are based on
   the STM32F103RBT6 chip for the standard version and on the
   STM32F103CBT6 for the mini version. See the
   `LeafLabs <http://leaflabs.com/docs/hardware/maple.html>`__ web site
   for hardware information; see the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/maple/README.txt>`__
   file for further information about the NuttX port.

#. **Olimexino-STM32**. This port uses the Olimexino STM32 board
   (STM32F103RBT6). See the http://www.olimex.com for further
   information. Contributed by David Sidrane.

#. **Nucleo-STM32F103RB**. This port uses the STM32F103RBT6. It was
   contributed by Mateusz Szafoni in NuttX-7.28,

These ports uses a GNU arm-nuttx-elf toolchain\* under either Linux or
Cygwin (with native Windows GNU tools or Cygwin-based GNU tools).

**STATUS:**

-  **Basic Support/Drivers**. The basic STM32 port was released in NuttX
   version 0.4.12. The basic port includes boot-up logic, interrupt
   driven serial console, and system timer interrupts. The 0.4.13
   release added support for SPI, serial FLASH, and USB device.; The
   4.14 release added support for buttons and SDIO-based MMC/SD and
   verified DMA support. Verified configurations are available for the
   NuttShell (NSH) example, the USB serial device class, and the USB
   mass storage device class example.

-  **Additional Drivers**. Additional drivers and configurations were
   added in NuttX 6.13 and later releases for the STM32 F1 and F4. F1
   compatible drivers include an Ethernet driver, ADC driver, DAC
   driver, PWM driver, IWDG, WWDG, and CAN drivers.

-  **M3 Wildfire**. Support for the Wildfire board was included in
   version 6.22 of NuttX. The board port is basically functional. Not
   all features have been verified. Support for FAT file system on an an
   SD card had been verified. The ENC28J60 network is functional (but
   required lifting the chip select pin on the W25x16 part).
   Customizations for the v3 version of the Wildfire board are
   selectable (but untested).

-  **Maple**. Support for the Maple boards was contributed by Yiran Liao
   and first appear in NuttX 6-30.

-  **Olimexino-STM32**. Contributed by David Sidrane and introduced with
   NuttX 7.9. Configurations are included for the NuttShell (NSH), a
   tiny version of the NuttShell, USB composite CDC/ACM + MSC, CAN
   support, and two tiny, small-footprint NSH configurations.

-  **Nucleo-STM32F103RB**. Contributed by Mateusz Szafoni and introduced
   with NuttX 7.28. Configurations are included for the NuttShell (NSH),
   ADC, and PWM.

**Development Environments:** 1) Linux with native Linux GNU toolchain,
2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS with Windows
native toolchain (RIDE7, CodeSourcery or devkitARM), or 4) Native
Windows. A DIY toolchain or Linux or Cygwin is provided by the NuttX
`buildroot <https://bitbucket.org/nuttx/buildroot/downloads/>`__
package.

STMicro STM32 F105x
-------------------

Architecture support (only) for the STM32 F105R was
contribed in NuttX-7.17 by Konstantin Berezenko. There is currently no
support for boards using any STM32F105x parts in the source tree.

STMicro STM32 F107x
-------------------

(STM32 F1 "Connectivity Line" family). Chip support
for the STM32 F1 "Connectivity Line" family has been present in NuttX
for some time and users have reported that they have successful brought
up NuttX on their proprietary boards using this logic.

**Olimex STM32-P107** Support for the `Olimex
STM32-P107 <https://www.olimex.com/dev/stm32-p107.html>`__ was
contributed by Max Holtzberg and first appeared in NuttX-6.21. That port
features the STMicro STM32F107VC MCU.

**STATUS:** A configuration for the NuttShell (NSH) is available and
verified. Networking is functional. Support for an external ENCX24J600
network was added in NuttX 6.30.

**Shenzhou IV** A port of NuttX to the Shenzhou IV development board
(See `www.armjishu.com <http://www.armjishu.com>`__) featuring the
STMicro STM32F107VCT MCU was added in NuttX-6.22.

**STATUS:** In progress. The following have been verified: (1) Basic
Cortex-M3 port, (2) Ethernet, (3) On-board LEDs. Refer to the NuttX
board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/shenzhou/README.txt>`__
file for further information.

**ViewTool STM32F103/F107** Support for the Viewtool
STM32F103/F107 board was added in
NuttX-6.32. That board features the STMicro STM32F107VCT6 MCU.
Networking, LCD, and touchscreen support were added in NuttX-6.33.

Three configurations are available:

#. A standard NuttShell (NSH) configuration that will work with either
   the STM32F103 or STM32F107 part.
#. A network-enabled NuttShell (NSH) configuration that will work only
   with the STM32F107 part.
#. The configuration that was used to verify the NuttX `high-priority,
   nested interrupt
   feature <https://cwiki.apache.org/confluence/display/NUTTX/High+Performance%2C+Zero+Latency+Interrupts>`__.

**STATUS:** Networking and touchscreen support are well test. But, at
present, neither USB nor LCD functionality have been verified. Refer to
the Viewtool STM32F103/F107
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/viewtool-stm32f107/README.txt>`__
file for further information.

**Kamami STM32 Butterfly 2** Support for the `Kamami STM32 Butterfly
2 <https://kamami.pl/zestawy-uruchomieniowe-stm32/178507-stm32butterfly2.html>`__
was contributed by Michał Łyszczek in NuttX-7.18. That port features the
STMicro STM32F107VC MCU.

**STATUS:** A configuration for the NuttShell (NSH), NSH with
networking, and NSH with USB host are available and verified.

STMicro STM32 F205x
-------------------

(STM32 F2 family). Architecture only support for the
STM32F205RG was contributed as an anonymous contribution in NuttX-7.10.

**Particle.io Phone**. Support for the Particle.io Photon board was
contributed by Simon Pirious in NuttX-7.21. The Photon board features
the STM32F205RG MCU. The STM32F205RG is a 120 MHz Cortex-M3 operation
with 1Mbit Flash memory and 128kbytes. The board port includes support
for the on-board Broadcom BCM43362 WiFi and fully usable FullMac network
support.

**STATUS:** In addition to the above-mention WiFI support, the Photon
board support includes buttons, LEDS, IWDG, USB OTG HS, and procfs
support. Configurations available for nsh, usbnsh, and wlan
configurations. See the Photon
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/photon/README.txt>`__
file for additional information.

STMicro STM32 F207x
-------------------

(STM32 F2 family)

-  Support for the STMicro STM3220G-EVAL development board was
   contributed by Gary Teravskis and first released in NuttX-6.16. This
   board uses the STM32F207IG.
-  Martin Lederhilger contributed support for the Olimex STM32 P207
   board using the STM32F207ZE MCU.
-  Board support for the Nucleo-L152RE was contributed by Mateusz
   Szafoni in NuttX-7.28. Available configurations include NSH, ADC, and
   PWM.

Microchip SAM3U
---------------

This port uses the `Microchip <http://www.atmel.com/>`__
SAM3U-EK development board that features the SAM3U4E MCU. This port uses
a GNU arm-nuttx-elf or arm-nuttx-eabi toolchain\* under either Linux or
Cygwin (with native Windows GNU tools or Cygwin-based GNU tools).

**Development Environments:** 1) Linux with native Linux GNU toolchain,
2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS with Windows
native toolchain (CodeSourcery or devkitARM), or 4) Native Windows. A
DIY toolchain for inux or Cygwin is provided by the NuttX
`buildroot <https://bitbucket.org/nuttx/buildroot/downloads/>`__
package.

Microchip SAM3X
---------------

There are two SAM3X boards supported:

#. The `Arduino <http://arduino.cc//>`__ Due development board that
   features the ATSAM3X8E MCU running at 84MHz. See the `Arduino
   Due <http://arduino.cc/en/Main/arduinoBoardDue>`__ page for more
   information.
#. The Mikroelektronika `Flip&Click
   SAM3X <https://www.mikroe.com/flip-n-click-sam3x>`__ development
   board. This board is an Arduino Due *work-alike* with additional
   support for 4 mikroBUS Click boards.

**Development Environments:** See the Microchip SAM3U discussion
`above. <#at91sam3u>`__

NXP LPC176x
-----------

NXP LPC1766, LPC1768, and LPC1769. Drivers are available for CAN, DAC,
Ethernet, GPIO, GPIO interrupts, I2C, UARTs, SPI, SSP, USB host, and USB
device. Additional drivers for the RTC, ADC, DAC, Timers, PWM and MCPWM
were contributed by Max (himax) in NuttX-7.3. Verified LPC17xx
configurations are available for these boards:

-  The Nucleus 2G board from `2G Engineering <http://www.2g-eng.com/>`__
   (LPC1768),
-  The mbed board from `mbed.org <http://mbed.org>`__ (LPC1768,
   Contributed by Dave Marples), and
-  The LPC1766-STK board from `Olimex <http://www.olimex.com/>`__
   (LPC1766).
-  The Embedded Artists base board with NXP LPCXpresso LPC1768.
-  Zilogic's ZKIT-ARM-1769 board.
-  The `Micromint <http://micromint.com/>`__ Lincoln60 board with an NXP
   LPC1769.
-  A version of the LPCXPresso LPC1768 board with special support for
   the U-Blox model evaluation board.
-  Support for the Keil MCB1700 was contributed by Alan Carvalho de
   Assis in NuttX-7.23.
-  Support for the NXP Semiconductors' PN5180 NFC Frontend Development
   Kit was contributed by Michael Jung in NuttX-7.1. This board is based
   on the NXP LPC1769 MCU.

The Nucleus 2G board, the mbed board, the LPCXpresso, and the MCB1700
all feature the NXP LPC1768 MCU; the Olimex LPC1766-STK board features
an LPC1766. All use a GNU arm-nuttx-elf or arm-eabi toolchain\* under
either Linux or Cygwin (with native Windows GNU tools or Cygwin-based
GNU tools).

**STATUS:** The following summarizes the features that has been
developed and verified on individual LPC17xx-based boards. These
features should, however, be common and available for all LPC17xx-based
boards.

#. **Nucleus2G LPC1768**

   -  Some initial files for the LPC17xx family were released in NuttX
      5.6, but
   -  The first functional release for the NXP LPC1768/Nucleus2G
      occurred with NuttX 5.7 with Some additional enhancements through
      NuttX-5.9. Refer to the NuttX board
      `README <https://bitbucket.org/patacongo/obsoleted/src/master/configs/nucleus2g/README.txt>`__
      file for further information.

   That initial, 5.6, basic release included *timer* interrupts and a
   *serial console* and was verified using the NuttX OS test
   (``apps/examples/ostest``). Configurations available include include
   a verified NuttShell (NSH) configuration (see :ref:`NSH <nsh>`). The
   NSH configuration supports the Nucleus2G's microSD slot and
   additional configurations are available to exercise the USB serial
   and USB mass storage devices. However, due to some technical reasons,
   neither the SPI nor the USB device drivers are fully verified.
   (Although they have since been verified on other platforms; this
   needs to be revisited on the Nucleus2G).

   **Obsoleted**. Support for the Nucleus2G board was terminated on
   2016-04-12. There has not been any activity with the commercial board
   in a few years and it no longer appears to be available from the
   2g-eng.com website. Since the board is commercial and no longer
   publicly available, it no longer qualifies for inclusion in the open
   source repositories. A snapshot of the code is still available in the
   `Obsoleted
   repository <https://bitbucket.org/patacongo/obsoleted/src/master/boards/nucleus2g>`__
   and can easily be *reconstitued* if needed.

#. **mbed LPC1768**

   -  Support for the mbed board was contributed by Dave Marples and
      released in NuttX-5.11. Refer to the NuttX board
      `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc17xx_40xx/mbed/README.txt>`__
      file for further information.

#. **Olimex LPC1766-STK**

   -  Support for that Olimex-LPC1766-STK board was added to NuttX 5.13.
   -  The NuttX-5.14 release extended that support with an *Ethernet
      driver*.
   -  The NuttX-5.15 release further extended the support with a
      functional *USB device driver* and *SPI-based micro-SD*.
   -  The NuttX-5.16 release added a functional *USB host controller
      driver* and *USB host mass storage class driver*.
   -  The NuttX-5.17 released added support for low-speed USB devices,
      interrupt endpoints, and a *USB host HID keyboard class driver*.
   -  Refer to the NuttX board
      `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc17xx_40xx/olimex-lpc1766stk/README.txt>`__
      file for further information.

   Verified configurations are now available for the NuttShell with
   networking and microSD support(NSH, see :ref:`NSH <nsh>`), for
   the NuttX network test, for the
   `THTTPD <http://acme.com/software/thttpd>`__ webserver, for USB
   serial deive and USB storage devices examples, and for the USB host
   HID keyboard driver. Support for the USB host mass storage device can
   optionally be configured for the NSH example. A driver for the *Nokia
   6100 LCD* and an NX graphics configuration for the Olimex LPC1766-STK
   have been added. However, neither the LCD driver nor the NX
   configuration have been verified as of the NuttX-5.17 release.

#. **Embedded Artists base board with NXP LPCXpresso LPC1768**

   An fully verified board configuration is included in NuttX-6.2. The
   Code Red toolchain is supported under either Linux or Windows.
   Verified configurations include DHCPD, the NuttShell (NSH), NuttX
   graphis (NX), THTTPD, and USB mass storage device. Refer to the NuttX
   board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc17xx_40xx/lpcxpresso-lpc1768/README.txt>`__
   file for further information.

#. **Zilogic's ZKIT-ARM-1769 board**

   Zilogic System's ARM development Kit, ZKIT-ARM-1769. This board is
   based on the NXP LPC1769. The initial release was included
   NuttX-6.26. The NuttX Buildroot toolchain is used by default. Verifed
   configurations include the "Hello, World!" example application and a
   THTTPD demonstration. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc17xx_40xx/zkit-arm-1769/README.txt>`__
   file for further information.

#. **Micromint Lincoln60 board with an NXP LPC1769**

   This board configuration was contributed and made available in
   NuttX-6.20. As contributed board support, I am unsure of what all has
   been verfied and what has not. See the Microment website
   and the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc17xx_40xx/lincoln60/README.txt>`__
   file for further information about the Lincoln board.

#. **U-Blox Modem Evaluation (LPCXpresso LPC1768)**

   This board configuration was contributed by Vladimir Komendantskiy
   and made available in NuttX-7.15. This is a variant of the LPCXpresso
   LPC1768 board support with special provisions for the U-Blox Model
   Evaluation board. See the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc17xx_40xx/u-blox-c027/README.txt>`__
   file for further information about this port.

#. **Keil MCB1700 (LPC1768)**

   This board configuration was contributed by Alan Carvalho de Assis in
   NuttX-7.23.

#. **PN5180 NFC Frontend Development Kit**

   This board configuration was contributed by Michael Jung in
   NuttX-7.31.

**Development Environments:** 1) Linux with native Linux GNU toolchain,
2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS with Windows
native toolchain (CodeSourcery devkitARM or Code Red), or 4) Native
Windows. A DIY toolchain for Linux or Cygwin is provided by the NuttX
`buildroot <https://bitbucket.org/nuttx/buildroot/downloads/>`__
package.

NXP LPC178x
-----------

The port of NuttX to the WaveShare Open1788 is a
collaborative effort between Rommel Marcelo and myself (with Rommel
being the leading contributor and I claiming only a support role). You
can get more information at the Open1788 board from the WaveShare
website.

ON Semiconductor LC823450
-------------------------

(Dual core ARM Cortex-M3). In NuttX-7.22,
Masayuki Ishikawa contributed support for both the LC823450 architecture
and for ON Semiconductor's **LC823450XGEVK board**:

   The LC823450XGEVK is an audio processing system Evaluation Board Kit
   used to demonstrate the LC823450. This part can record and playback,
   and offers High-Resolution 32-bit & 192 kHz audio processing
   capability. It is possible to cover most of the functions necessary
   for a portable audio with only this LSI as follows. It has Dual CPU
   and DSP with High processing capability, and internal 1656K-Byte
   SRAM, which make it possible to implement large scale program. And it
   has integrated analog functions (low-power Class D HP amplifier, PLL,
   ADC etc.) so that PCB space and cost is reduced, and it has various
   interface (USB, SD, SPI, UART, etc.) to make extensibility high. Also
   it is provided with various function including SBC/AAC codec by DSP
   and UART and ASRC (Asynchronous Sample Rate Converter) for Bluetooth®
   audio. It is very small chip size in spite of the multi-funciton as
   described above and it realizes the low power consumption. Therefore,
   it is applicable to portable audio markets such as Wireless headsets
   and will show high performance.

Further information about the LC823450XGEVK is available on from the the
`ON
Semiconductor <http://www.onsemi.com/PowerSolutions/evalBoard.do?id=LC823450XGEVK>`__
website as are LC823450 `related technical
documents <http://www.onsemi.com/PowerSolutions/supportDoc.do?type=AppNotes&rpn=LC823450>`__.
Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/lc823450/lc823450-xgevk/README.txt>`__
file for details of the NuttX port.

This port is intended to test LC823450 features including SMP. Supported
peripherals include UART, TIMER, RTC, GPIO, DMA, I2C, SPI, LCD, eMMC,
and USB device. ADC, Watchdog, IPC2, and I2S support was added by
Masayuki Ishikawa in NuttX-7.23. Bluetooth, SPI, and *PROTECTED* build
support were added by Masayuki Ishikawa in NuttX-7.26. Support for for
SPI flash boot was added in NuttX-7.28.

Maxim Integrated MAX32660
-------------------------

Architectural upport for the MAX32660 was added (along with partial
support for other members of the MAX326xx family) in NuttX 7.28.

**MAX32660-EVSYS**. Basic support for the Maxim Integrated MAC3X660
EVSYS was included in the NuttX-7.28 release. A basic NSH configuration
is available and is fully functional. Includes unverified support for an
SPI0-based SD card.

**STATUS:**

` <#>`__ (ARM Cortex-M3)

ARM Cortex-M4
=============

Infineon XMC45xx
----------------

An initial but still incomplete port to the XMC4500 Relax board was released
with NuttX-7.21 (although it was not really ready for prime time). Basic NSH
functionality was a serial console was added by Alan Carvahlo de Assis in
NuttX-7.23. Alan also added an SPI driver in NuttX-7.25.

This initial porting effort uses the Infineon XMC4500 Relax v1 board as
described on the manufacturer's
`website <http://www.infineon.com/cms/en/product/evaluation-boards/KIT_XMC45_RELAX_V1/productType.html?productType=db3a304437849205013813b23ac17763>`__.
The current status of the board is available in the board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/xmc4/xmc4500-relax/README.txt>`__
file

Nordic Semiconductor NRF52xxx
-----------------------------

Initial architecture support of the NRF52
including UART, Timer, and GPIOs was contributed by Janne Rosberg in
NuttX-7.25. Janne also contributed board support for the NRF52-PCA10040
development board at that time.

The NRF52 was generalized by Hanya Zou in NuttX-7.28 for any similar
board based on the NRF52832 MCU. Support was specifically included for
the Adafruit NRF52 Feather board.

Available drivers include:

-  **NuttX-7.25**. UART, Timer, and GPIOs from Janne Rosberg and a
   watchdog timer driver was added by Levin Li.
-  **NuttX-7.25**. Flash PROGMEM support was added by Alan Carvalho de
   Assis.
-  **NuttX-7.29**. Support for the 52804 family and an RNG drivers was
   added by Levin Li.

NXP/FreeScale Kinetis K20
-------------------------

Used by Teensy-3.x. Architecture support (only) was
added in NuttX-7.10. This support was taken from PX4 and is the work of
Jakob Odersky. Support was added for the PJRC Teensy-3.1 board in
NuttX-7.11. Backward compatible support for the Teensy-3.0 is included.

NXP/FreeScale Kinetis K28F
--------------------------

Use by Freedom-K28F. Architecture support for the
Kinetis K28F along with board support for the Freedom-K28F was added in
NuttX-7.15. The Freedom-K28F board is based on the Kinetis
MK28FN2M0VMI15 MCU (ARM Cortex-M4 at150 MHz, 1 MB SRAM, 2 MB flash, HS
and FS USB, 169 MAPBGA package). More information is available from the
`NXP
website <https://www.nxp.com/support/developer-resources/hardware-development-tools/freedom-development-boards/mcu-boards/nxp-freedom-development-board-for-kinetis-k27-and-k28-mcus:FRDM-K28F>`__.

NXP/FreeScale Kinetis K40
-------------------------

This port uses the Freescale Kinetis KwikStik
K40. Refer to the `Freescale web
site <http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=KWIKSTIK-K40>`__
for further information about this board. The Kwikstik is used with the
FreeScale Tower System (mostly just to provide a simple UART connection)

NXP/FreeScale Kinetis K60
-------------------------

This port uses the **Freescale Kinetis
TWR-K60N512** tower system. Refer to the `Freescale web
site <http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=TWR-K60N512-KIT>`__
for further information about this board. The TWR-K60N51 includes with
the FreeScale Tower System which provides (among other things) a DBP
UART connection.

**MK60N512VLL100**. Architecture support for the MK60N512VLL100 was
contributed by Andrew Webster in NuttX-7.14.

NXP/FreeScale Kinetis K64
-------------------------

Support for the Kinetis K64 family and
specifically for the **NXP/Freescale Freedom K64F** board was added in
NuttX 7.17. Initial release includes two NSH configurations with support
for on-board LEDs, buttons, and Ethernet with the on-board KSZ8081 PHY.
SDHC supported has been integrated, but not verified. Refer to the NuttX
board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/kinetis/freedom-k64f/README.txt>`__
file for further information.

**MK64FN1M0VMD12**. Architecture support for the \_MK64FN1M0VMD12 was
contributed by Maciej Skrzypek in NuttX-7.20.

**NXP/Freescale Kinetis TWR-K64F120M**. Support for the Freescale
Kinetis TWR-K64F120M was contributed in NuttX-7.20 by Maciej Skrzypek.
Refer to the `Freescale web
site <http://www.nxp.com/products/sensors/accelerometers/3-axis-accelerometers/kinetis-k64-mcu-tower-system-module:TWR-K64F120M>`__
for further information about this board. The board may be complemented
by
`TWR-SER <http://www.nxp.com/pages/serial-usb-ethernet-can-rs232-485-tower-system-module:TWR-SER>`__
which includes (among other things), an RS232 and Ethernet connections.
Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/kinetis/twr-k64f120m/README.txt>`__
file for further information.

**Driver Status**.

-  **NuttX-6.8**. Ethernet and SD card (SDHC) drivers also exist: The
   SDHC driver is partially integrated in to the NSH configuration but
   has some outstanding issues. Additional work remaining includes: (1)
   integrate th SDHC drivers, and (2) develop support for USB host and
   device. NOTE: Most of these remaining tasks are the same as the
   pending K40 tasks described above.
-  **NuttX-7.14**. The Ethernet driver became stable in NuttX-7.14
   thanks to the efforts of Andrew Webster.
-  **NuttX-7.17**. Ethernet support was extended and verified on the
   Freedom K64F. A Kinetis USB device controller driver and PWM support
   was contributed by kfazz.

NXP/FreeScale Kinetis K66
-------------------------

Support for the Kinetis K64 family and
specifically for the **NXP/Freescale Freedom K66F** board was
contributed by David Sidrane in NuttX 7.20. Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/kinetis/freedom-k66f/README.txt>`__
file for further information.

**Driver Status**.

-  Most K6x drivers are compatible with the K66.
-  **NuttX-7.20**. David Sidrane also contributed support for a serial
   driver on the K66's LPUART.
-  **NuttX-7.22**. David Sidrane contributed improvements to the USB and
   I2C device drivers, RTC alarm functionality, and new SPI driver.
-  **NuttX-7.26**. David Sidrane contributed DMA support to the Kinetis
   K6x family.

Sony CXD56xx
------------

(6 x ARM Cortex-M4)

Support for the CXD56\ *xx* was
introduced by Nobuto Kobayashi in NuttX-7.30.

**Sony Spresence**. Spresense is a compact development board based on
Sony’s power-efficient multicore microcontroller CXD5602. Basic support
for the Sony Spresense board was included in the contribution of Nobuto
Kobayashi in NuttX-7.30. *NOTE*: That was an initial, bare bones basic
Spresense port sufficient for running a NuttShell (NSH) and should not
be confused with the full Spresence SDK offered from Sony. Since then
there has been much development of the NuttX CXD56xx port.

**Features:**

-  Integrated GPS: Embedded GNSS with support for GPS, QZSS.
-  Hi-res audio output and multi mic inputs" Advanced 192kHz/24 bit
   audio codec and amplifier for audio output, and support for up to 8
   mic input channels.
-  Multicore microcontroller: Spresense is powered by Sony's CXD5602
   microcontroller (ARM® Cortex®-M4F × 6 cores), with a clock speed of
   156 MHz.

**Driver Status:**

**NuttX-3.31**. In this release, many new architectural features,
peripheral drivers, and board configurations were contributed primarily
through the work of Alin Jerpelea. These new architectural features
include: Inter-core communications, power management, and clock
management. New drivers include: GPIO, PMIC, USB, SDHC, SPI, I2C, DMA,
RTC, PWM, Timers, Watchdog Timer, UID, SCU, ADC, eMMC, Camera CISIF,
GNSS, and others.

**NuttX-8.1**. Alin Jerpelea brought in ten (external) sensor drivers
that integrate through the CXD56xx's SCU.

**NuttX-8.2**. Masayuki Ishikawa implemented SMP operation of the
CX56Dxx parts. Alin Jerpelea: Added support for the Altair LTE modem
support, enabled support for accelerated format converter, rotation and
so on using the CXD5602 image processing accelerator, added ISX012
camera support, added audio and board audio control implementation,
added an audio_tone_generator, added optional initialization of GNSS and
GEOFENCE at boot if the drivers are enabled, added an lcd examples
configuration.

STMicro STM32 F302x
-------------------

(STM32 F3 family). Architecture (only) support for
the STM32 F302 was contributed in NuttX-7.10 by Ben Dyer (via the PX4
team and David Sidrane).

Support for the Nucleo-F302R8 board was added by raiden00pl in
NuttX-7.27. Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/nucleo-f302r8/README.txt>`__
file for further information.

STMicro STM32 F303x
-------------------

(STM32 F3 family)

-  **STM32F3-Discovery**. This port uses the STMicro STM32F3-Discovery
   board featuring the STM32F303VCT6 MCU (STM32 F3 family). Refer to the
   `STMicro web
   site <http://www.st.com/internet/evalboard/product/254044.jsp>`__ for
   further information about this board.

-  **STMicro ST Nucleo F303RE board**. The basic port for the Nucleo
   F303RE was contributed by Paul Alexander Patience and first released
   in NuttX-7.12. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/nucleo-f303re/README.txt>`__
   file for further information.

-  **STMicro ST Nucleo F303ZE board**. Support for the Nucleo-F303ZE
   board was added by Mateusz Szafoni in NuttX-7.27. Refer to the NuttX
   board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/nucleo-f303ze/README.txt>`__
   file for further information.

STMicro STM32 F334
------------------

(STM32 F3 family, ARM Cortex-M4)

Support for the STMicro **STM32F334-Disco** board was contributed by
Mateusz Szafoni in NuttX-7.22 and for the **Nucleo-STM32F334R8** was
contributed in an earlier release.

STMicro STM32 F372/F373
-----------------------

(ARM Cortex-M4)

Basic architecture support for the STM32F372/F373 was contributed by
Marten Svanfeldt in NuttX 7.9. There are no STM32F*72 boards currently
supported, however.

STMicro STM32 F4x1
------------------

(STM32 F4 family).

**Nucleo F401RE**. This port uses the STMicro Nucleo F401RE board
featuring the STM32F401RE MCU. Refer to the `STMicro web
site <http://www.st.com/en/evaluation-tools/nucleo-f401re.html>`__ for
further information about this board.

**Nucleo F411RE**. This port uses the STMicro Nucleo F411RE board
featuring the STM32F411RE MCU. Refer to the `STMicro web
site <http://www.st.com/en/evaluation-tools/nucleo-f411re.html>`__ for
further information about this board.

**STATUS:**

-  **NuttX-7.2** The basic port for STMicro Nucleo F401RE board was
   contributed by Frank Bennett.
-  **NuttX-7.6** The basic port for STMicro Nucleo F401RE board was
   added by Serg Podtynnyi.
-  **NuttX-7.25** Architecture support (only) for STMicro STM32F401xB
   and STM32F401xC pars was added.
-  Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/nucleo-f4x1re/README.txt>`__
   file for further information.

STMicro STM32410
----------------

(STM32 F4 family)

Architecture-only support was contributed to NuttX-7.21 by Gwenhael
Goavec-Merou.

STMicro STM32 F405x/407x
------------------------

(STM32 F4 family).

**STMicro STM3240G-EVAL**. This port uses the STMicro STM3240G-EVAL
board featuring the STM32F407IGH6 MCU. Refer to the `STMicro web
site <http://www.st.com/internet/evalboard/product/252216.jsp>`__ for
further information about this board.

**STATUS:**

-  **NuttX-6.12** The basic port is complete and first appeared in
   NuttX-6.12. The initial port passes the NuttX OS test and includes a
   validated configuration for the NuttShell (NSH, see :ref:`NSH <nsh>`) as well
   as several other configurations.
-  **NuttX-6.13-6.16** Additional drivers and configurations were added
   in NuttX 6.13-6.16. Drivers include an Ethernet driver, ADC driver,
   DAC driver, PWM driver, CAN driver, F4 RTC driver, Quadrature
   Encoder, DMA, SDIO with DMA (these should all be compatible with the
   STM32 F2 family and many should also be compatible with the STM32 F1
   family as well).
-  **NuttX-6.16** The NuttX 6.16 release also includes and logic for
   saving/restoring F4 FPU registers in context switches. Networking
   intensions include support for Telnet NSH sessions and new
   configurations for DHPCD and the networking test (nettest).
-  **NuttX-6.17** The USB OTG device controller driver, and LCD driver
   and a function I2C driver were added in NuttX 6.17.
-  **NuttX-6.18** STM32 IWDG and WWDG watchdog timer drivers were added
   in NuttX 6.18 (should be compatible with F1 and F2). An LCD driver
   and a touchscreen driver for the STM3240G-EVAL based on the STMPE811
   I/O expander were also added in NuttX 6.18.
-  **NuttX-6.21** A USB OTG host controller driver was added in NuttX
   6.21.
-  **NuttX-7.3** Support for the Olimex STM32 H405 board was added in
   NuttX-7.3.
-  **NuttX-7.14** Support for the Olimex STM32 H407 board was added in
   NuttX-7.14.
-  **NuttX-7.17** Support for the Olimex STM32 E407 board was added in
   NuttX-7.17.
-  **NuttX-7.19** Support for the Olimex STM32 P407 board was added in
   NuttX-7.19.
-  **NuttX-7.21** Support for the MikroElektronika Clicker2 for STM32
   (STM32 P405) board was added in NuttX-7.21.
-  **NuttX-7.29** Support for the OmnibusF4 architecture (STM32 P405)
   board was added in NuttX-7.29.

Refer to the STM3240G-EVAL board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/stm3240g-eval/README.txt>`__
file for further information.

**STMicro STM32F4-Discovery**. This port uses the STMicro
STM32F4-Discovery board featuring the STM32F407VGT6 MCU. The
STM32F407VGT6 is a 168MHz Cortex-M4 operation with 1Mbit Flash memory
and 128kbytes. The board features:

-  On-board ST-LINK/V2 for programming and debugging,
-  LIS302DL, ST MEMS motion sensor, 3-axis digital output accelerometer,
-  MP45DT02, ST MEMS audio sensor, omni-directional digital microphone,
-  CS43L22, audio DAC with integrated class D speaker driver,
-  Eight LEDs and two push-buttons,
-  USB OTG FS with micro-AB connector, and
-  Easy access to most MCU pins.

Support for the STM3F4DIS-BB base board was added in NuttX-7.5. This
includes support for the serial communications via the on-board DB-9
connector, Networking, and the microSD card slot.

Refer to the `STMicro web
site <http://www.st.com/internet/evalboard/product/252419.jsp>`__ for
further information about this board and to

**MikroElektronika Mikromedia for STM32F4**. This is another board
supported by NuttX that uses the same STM32F407VGT6 MCU as does the
STM32F4-Discovery board. This board, however, has very different
on-board peripherals than does the STM32F4-Discovery:

-  TFT display with touch panel,
-  VS1053 stereo audio codec with headphone jack,
-  SD card slot,
-  Serial FLASH memory,
-  USB OTG FS with micro-AB connector, and
-  Battery connect and batter charger circuit.

See the
`Mikroelektronika <http://www.mikroe.com/mikromedia/stm32-m4/>`__
website for more information about this board and the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/mikroe-stm32f4/README.txt>`__
file for further information about the NuttX port.

**Olimex STM32 H405**. Support for the Olimex STM32 H405 development
board was contributed by Martin Lederhilger and appeared in NuttX-7.3.
See the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/olimex-stm32-h405/README.txt>`__
file for further information about the NuttX port.

**Olimex STM32 H407**. Support for the Olimex STM32 H407 development
board was contributed by Neil Hancock and appeared in NuttX-7.14. See
the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/olimex-stm32-h407/README.txt>`__
file for further information about the NuttX port.

**Olimex STM32 E407**. Support for the Olimex STM32 E407 development
board was contributed by Mateusz Szafoni and appeared in NuttX-7.17.
Networking configurations were added in NuttX-7.18. See the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/olimex-stm32-e407/README.txt>`__
file for further information about the NuttX port.

**Olimex STM32 P407**. Support for the Olimex STM32 P407 development
board appeared in NuttX-7.19. See the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/olimex-stm32-p407/README.txt>`__
file for further information about the NuttX port.

**MikroElektronika Clicker2 for STM32**. This is yet another board
supported by NuttX that uses the same STM32F407VGT6 MCU as does the
STM32F4-Discovery board. This board has been used primarily with the
MRF24J40 Click board for the development of IEEE 802.15.4 MAC and
6LoWPAN support.

See the
`Mikroelektronika <https://shop.mikroe.com/development-boards/starter/clicker-2/stm32f4>`__
website for more information about this board and the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/clicker2-stm32/README.txt>`__
file for further information about the NuttX port.

**OmnibusF4**. Initial support for the OmnibusF4 family of flight
management units was contributed by Bill Gatliff in NuttX-7.29.
"OmnibusF4" is not a product name *per se*, but rather a design
specification that many product vendors adhere to. The specification
defines the major components, and how those components are wired into
the microcontroller. *Airbot* is one such vendor. They publish a
`schematic <http://bit.ly/obf4pro>`__. Other software that supports the
OmnibusF4 family include Betaflight, iNAV, and many others. PX4 recently
added support as well, also based on NuttX. No code from those resources
is included in this port. The OmnibusF4 specification mandates the
InvenSense MPU6000 which is included in NuttX-7.29 along with a driver
for the MAX7546 OSD.

STMicro STM32 F427/F437
-----------------------

General architectural support was provided for
the F427/437 family in NuttX 6.27. Specific support includes the
STM32F427I, STM32F427Z, and STM32F427V chips. This is
*architecture-only* support, meaning that support for the boards with
these chips is available, but not support for any publicly available
boards is included. This support was contributed by Mike Smith.

The F427/437 port adds (1) additional SPI ports, (2) additional UART
ports, (3) analog and digital noise filters on the I2C ports, (4) up to
2MB of flash, (5) an additional lower-power mode for the internal
voltage regulator, (6) a new prescaling option for timer clock, (7) a
larger FSMSC write FIFO, and (8) additional crypto modes (F437 only).

**Axlotoi**. In NuttX-7.31, Jason Harris contributed support for the
Axloti board. That is the board for the Axoloti open source synthesizer
board featuring the STM32F427IGH6 MCU The STM32F427IGH6 has a 180MHz
Cortex-M4 core with 1MiB Flash memory and 256KiB of SRAM The Axloti
board features:

-  ADAU1961 24-bit 96 kHz stereo CODEC
-  1/4" in/out jacks for analog audio signals
-  3.5 mm jack for analog audio signals
-  8 MiB of SDRAM (Alliance Memory AS4C4M16SA)
-  Serial MIDI in/out ports
-  SD Card slot
-  Two user LEDs and one (GPIO) push-button
-  USB OTG FS with Micro-AB connector (USB device mode operation)
-  USB OTG HS with Type-A connector (USB host mode operation)
-  Easy access to most IO pins

Refer to `Axloti <http://www.axoloti.com/>`__ website for further
information about this board.

STMicro STM32 F429
------------------

Support for STMicro STM32F429I-Discovery development
board featuring the STM32F429ZIT6 MCU was contributed in NuttX-6.32 by
Ken Pettit. The STM32F429ZIT6 is a 180MHz Cortex-M4 operation with 2Mbit
Flash memory and 256kbytes.

**STATUS**:

-  The initial release included support from either OTG FS or OTG HS in
   FS mode.
-  The F429 port adds support for the STM32F439 LCD and OTG HS (in FS
   mode).
-  In Nutt-7.6, Brennan Ashton added support for concurrent OTG FS and
   OTG HS (still in FS mode) and Marco Krahl added support for an
   SPI-based LCD .
-  In Nutt-7.7, Marco Krahl included support for a framebuffer based
   driver using the LTDC and DMA2D. Marcos's implementation included
   extensions to support more advance LTDC functions through an
   auxiliary interface.
-  Support for the uVision GCC IDE added for theSTM32F429I-Discovery
   board in NuttX 7.16. From Kha Vo.

Refer to the STM32F429I-Discovery board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/stm32f429i-disco/README.txt>`__
file for further information.

STMicro STM32 F433
------------------

Architecture-only support for the STM32 F433 family
was contributed by Alan Carvalho de Assis in NuttX-7.22 (meaning that
the parts are supported, but there is no example board supported in the
system). This support was contributed by David Sidrane and made
available in NuttX-7.11.

STMicro STM32 F446
------------------

Architecture-only support is available for the STM32
F446 family (meaning that the parts are supported, but there is no
example board supported in the system). This support was contributed by
David Sidrane and made available in NuttX-7.11.

STMicro STM32 F46xx
-------------------

Architecture-only support is available for the
STM32 F46xx family (meaning that the parts are supported, but there is
no example board supported in the system). This support was contributed
by Paul Alexander Patienc and made available in NuttX-7.15.

STMicro STM32 G474x
-------------------

One board is supported in this family:

-  **B-G474E-DPOW1 Discovery Kit**. Initial board support for the
   STMicro B-G474E-DPOW1 board from ST Micro was added in NuttX-9.1. See
   the `STMicro
   website <https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-mpu-eval-tools/stm32-mcu-mpu-eval-tools/stm32-discovery-kits/b-g474e-dpow1.html>`__
   and the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/b-g474e-dpow1/README.txt>`__
   file for further information.

**Status**:

**NuttX-9.1**. Initial support for booting NuttX to a functional NSH
prompt on this board.

STMicro STM32 G431x
-------------------

One board is supported in this family:

-  **Nucleo-G431RB**. Initial board support for the
   Nucleo-G431RB was added in NuttX-10.0. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/nucleo-g431rb/README.txt>`__
   file for further information.

-  **B-G431B-ESC1**. Initial board support for the
   B-G431B-ESC1 was added in NuttX-10.0. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32/b-g431b-esc1/README.txt>`__
   file for further information.

STMicro STM32 L475
------------------

One board in supported in this family:

-  **B-L475E-IOT01A Discovery Kit**. Board support for the STMicro
   B-L475E-IOT01A board from ST Micro was contributed by Simon Piriou in
   NuttX-7.22. See the `STMicro
   website <http://www.st.com/en/evaluation-tools/b-l475e-iot01a.html>`__
   and the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32l4/b-l475e-iot01a/README.txt>`__
   file for further information.

   This board STMicro is powered by STM32L475VG Cortex-M4 and targets
   IoT nodes with a choice of connectivity options including WiFi,
   Bluetooth LE, NFC, and sub-GHZ RF at 868 or 915 MHz, as well as a
   long list of various environmental sensors.

**Status**:

**NuttX-7.22**. The initial board support was released. Since this board
is highly compatible with the related, more mature STM32 L4 parts, it is
expected that there is a high degree of compatibility and with those
part.

This board has been used extensive to develop NuttX PktRadio support for
the onboard Spirit1 radio (SPSGRF-915) radio. 6LoWPAN radio
communications are fully supported in point-to-point and in star
topologies.

Simon Pirou also contributed support for the on-board Macronix QuadSPI
FLASH in NuttX 7.22.

STMicro STM32 L476
------------------

Three boards are supported in this family:

-  **Nucleo-L476RG**. Board support for the STMicro NucleoL476RG board
   from ST Micro was contributed by Sebastien Lorquet in NuttX-7.15. See
   the `STMicro website <http://www.st.com/nucleo-l476rg>`__ and the
   board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32l4/nucleo-l476rg/README.txt>`__
   file for further information.

-  **STM32L476VG Discovery**. Board support for the STMicro STM32L476VG
   Discovery board from ST Micro was contributed by Dave in NuttX-7.15.
   See the `STMicro website <http://www.st.com/stm32l476g-disco>`__ and
   the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32l4/stm32l476vg-disco/README.txt>`__
   file for further information.

-  **STM32L476 MDK**. Very basic support for NuttX on the Motorola Moto
   Z MDK was contributed by Jim Wylder in NuttX 7.18. A simple NSH
   configuration is available for the STM32L476 chip. See the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32l4/stm32l476-mdk/README.txt>`__
   file for further information.

**Status**:

**NuttX-7.15**. Only the first initial release of support for this
family is present. It includes these basics:

-  RCC, clocking, Interrupts, System timer
-  UART, USART, Serial Console
-  GPIO, DMA, I2C, RNG, SPI

**NuttX-7.16**. Additional drivers were contributed:

-  QSPI with DMA and memory mapped support. From Dave (ziggurat29).
-  CAN contributed by Sebastien Lorquet.
-  I2C made functional by Dave (ziggurat29).

**NuttX-7.17**. Additional drivers/features were contributed:

-  Support for tickless mode.
-  CAN driver enhancements.

**NuttX-7.18**. Additional drivers were contributed:

-  Oneshot timer driver.
-  Quadrature encode contributed by Sebastien Lorquet.

**NuttX-7.20**. Additional drivers were added:

-  Serial Audio Interface (SAI).
-  Power Management.
-  LPTIM.
-  Comparator (COMP).

**NuttX-7.21**. Additional drivers were added:

-  Internal Watchdog (IWDG).

**NuttX-7.22**.

-  DAC and ADC drivers were contributed by Juha Niskanen.

**NuttX-7.30**.

-  Added USB FS device driver, CRS and HSI38 support from Juha Niskanen.

**NuttX-8.2**.

Add DMA support for STM32L4+ series. From Jussi Kivilinna.

Add support for LPTIM timers on the STM32L4 as PWM outputs. From Matias
N.

Enable OTGFS for STM32L4+ series. The OTGFS peripheral on stm32l4x6 and
stm32l4rxxx reference manual is exactly the same. From Jussi Kivilinna.

STMicro STM32 L4x2
------------------

Architecture support for STM32 L4x2 family was
contributed by Juha Niskanen in NuttX-7.21. Support was extended for the
STM32L412 and STM32L422 chips in NuttX-7.27. Two boards are currently
supported.

-  **Nucleo-L432KC**. Board support for the STMicro Nucleo-L432KC board
   from ST Micro was contributed by JSebastien Lorquet in NuttX-7.21.
   See the `STMicro
   website <http://www.st.com/en/evaluation-tools/nucleo-l432kc.html>`__
   and the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32l4/nucleo-l432kc/README.txt>`__
   file for further information.

-  **Nucleo-L452RE**. Board support for the STMicro Nucleo-L452RE board
   from ST Micro was contributed by Juha Niskanen in NuttX-7.21. See the
   `STMicro
   website <http://www.st.com/en/evaluation-tools/nucleo-l452re.html>`__
   and the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32l4/nucleo-l452re/README.txt>`__
   file for further information.

See also the status above for the STM32 L476 most of which also applies
to these parts.

STMicro STM32 L496
------------------

Architecture support for STM32 L496 was contributed
by Juha Niskanen along with board support for the Nucleo-L496ZG in
NuttX-7.21:

-  **Nucleo-L496ZG**. Board support for the STMicro Nucleo-L496ZG board
   from ST Micro was contributed by Juha Niskanen in NuttX-7.21. See the
   `STMicro
   website <http://www.st.com/en/evaluation-tools/nucleo-l496zg.html>`__
   and the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32l4/nucleo-l496zg/README.txt>`__
   file for further information. See also the status above for the STM32
   L476 most of which also applies to this part.

STMicro STM32 L4Rx
------------------

Architecture support for STM32 L4+ family was
contributed by Juha Niskanen along with board support for the
STM32L4R9I-Discovery in NuttX-7.26. Additional support for the
STM32L4R5ZI part was added by Jussi in NuttX-8.2.

-  **STM32L4R9I-Discovery**. Board support for the STMicro
   STM32L4R9I-Discovery board from ST Micro was contributed by Juha
   Niskanen in NuttX-7.26. That development board uses the STM32L4R9AI
   part. See the `STMicro
   website <https://www.st.com/en/evaluation-tools/32l4r9idiscovery.html>`__
   and the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/stm32l4/stm32l4r9ai-disco/README.txt>`__
   file for further information. See also the status above for the
   opther STM32 L4 parts, most of which also applies to this part.

NXP LPC40xx
-----------

The LPC40xx family is very similar to the LPC17xx family
except that it features a Cortex-M4F versus the LPC17xx's Cortex-M3.
Architectural support for the LPC40xx family was built on top of the
existing LPC17xx by jjlange in NuttX-7.31. With that architectural
support came support for two boards also contributed by jjlange:

**LX CPU**. Pavel Pisa add support for the PiKRON LX CPU board. This
board may be configured to use either the LPC4088 or the LPC1788.

**Driver Status.**

NXP LPC43xx
-----------

Several board ports are available for this higher end, NXP
Cortex-M4F part:

**NXG Technologies LPC4330-Xplorer**. This NuttX port is for the
LPC4330-Xplorer board from NGX Technologies featuring the NXP
LPC4330FET100 MCU. See the `NXG
website <http://shop.ngxtechnologies.com/product_info.php?cPath=21_37&products_id=104>`__
for further information about this board.

-  **STATUS:** Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc43xx/lpc4330-xplorer/README.txt>`__
   file for more detailed information about this port.

-  **NuttX-6.20** The basic LPC4330-Xplorer port is complete. The basic
   NuttShell (NSH) configuration is present and fully verified. This
   includes verified support for: SYSTICK system time, pin and GPIO
   configuration, and a serial console.

**NXP/Embest LPC4357-EVB**. This NuttX port is for the LPC4357-EVB from
NXP/Embest featuring the NXP LPC4357FET256 MCU. The LPC4357 differs from
the LPC4330 primarily in that it includes 1024KiB of on-chip NOR FLASH.
See the `NXP
website <http://www.nxp.com/news/news-archive/2013/nxp-development-kit-based-on-the-dual-core-lpc4357-microcontroller.html>`__
for more detailed information about the LPC4357 and the LPC4357-EVB.

-  **STATUS:** Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc43xx/lpc4357-evb/README.txt>`__
   file for more detailed information about this port.

-  **NuttX-7.6**. The basic port is was contributed by Toby Duckworth.
   This port leverages from the LPC4330-Xplorer port (and, as of this
   writing, still requires some clean up of the technical discussion in
   some files). The basic NuttShell (NSH) configuration is present and
   has been verified. Support is generally the same as for the
   LPC4330-Xplorer as discussed above.

**NXP LPC4370-Link2**. This is the NuttX port to the NXP LPC4370-Link2
development board featuring the NXP LPC4370FET100 MCU.

-  **STATUS:** Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc43xx/lpc4370-link2/README.txt>`__
   file for more detailed information about this port.

-  **NuttX-7.12** The NXP LPC4370-Link2 port is was contributed by Lok
   Tep and first released in NuttX-7.12.

**WaveShare LPC4337-WS**. This is the NuttX port to the WaveShare
LPC4337-WS development board featuring the NXP LPC4337JBD144 MCU.

-  **STATUS:** Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc43xx/lpc4337-ws/README.txt>`__
   file for more detailed information about this port.

-  **NuttX-7.14** The NXP WaveShare LPC4337-WS port is was contributed
   by Lok Tep and first released in NuttX-7.14.

-  **NuttX-7.16** Support for the LPC4337JET100 chip was contribed by
   Alexander Vasiljev. Alexander also contributed an LPC43xx AES driver
   available in NuttX-7.16.

**Driver Status**.

-  **NuttX-6.20** Several drivers have been copied from the related
   GPDMA, I2C, SPI, and SSP. The registers for these blocks are the same
   in both the LPC43xx and the LPC17xx and they should integrate into
   the LPC43xx very easily by simply adapting the clocking and pin
   configuration logic.

   Other LPC17xx drivers were not brought into the LPC43xx port because
   these peripherals have been completely redesigned: CAN, Ethernet, USB
   device, and USB host.

   So then there is no support for the following LPC43xx peripherals:
   SD/MMC, EMC, USB0,USB1, Ethernet, LCD, SCT, Timers 0-3, MCPWM, QEI,
   Alarm timer, WWDT, RTC, Event monitor, and CAN.

   Some of these can be leveraged from other MCUs that appear to support
   the same peripheral IP:

   -  The LPC43xx USB0 peripheral appears to be the same as the USB OTG
      peripheral for the LPC31xx. The LPC31xx USB0 device-side driver
      has been copied from the LPC31xx port but also integration into
      the LPC43xx (clocking and pin configuration). It should be
      possible to complete porting of this LPC31xx driver with a small
      porting effort.
   -  The Ethernet block looks to be based on the same IP as the STM32
      Ethernet and, as a result, it should be possible to leverage the
      NuttX STM32 Ethernet driver with a little more effort.

-  **NuttX-6.21** Added support for a SPIFI block driver and for RS-485
   option to the serial driver.

-  **NuttX-7.17** EMC support was extended to include support SDRAM by
   Vytautas Lukenska.

-  **NuttX-7.23** A CAN driver was contributed by Alexander Vasiljev in
   NuttX-7.23.

-  **NuttX-7.24** RTC and Windowed Watchdog Timer (WWDT) drivers were
   leveraged from the LPC17 and contributed by Gintaras Drukteinis.
   Leveraged the LPC54xx SD/MMC to the LPC43xx. There are still
   remaining issues with the SD/MMC driver and it is not yet functional.

NXP LPC54xx
-----------

A port to the
`LPCXpresso-LPC54628 <https://www.nxp.com/support/developer-resources/hardware-development-tools/lpcxpresso-boards/lpcxpresso54628-development-board:OM13098>`__
was added in NuttX-7.24. Initial configurations include: A basic NSH
configuration (nsh), a networking configuration (netnsh), and three
graphics configurations (nxwm, fb, and lvgl).

**LPC4508**. The port was verified on an LPC5408 by a NuttX user with
relevant changes incorporated in NuttX-7.26.

**Driver Status**.

-  **NuttX-7.24** The initial release for the LPC54xx in NuttX included
   the following drivers: UARTs, SysTick, SD/MMC, DMA, GPIO, GPIO
   interrupts, LEDs and buttons, LCD, WWDT, RTC, RNG, Ethernet, and SPI.
   The SPI driver is untested and there are known issues with the SD/MMC
   driver, however.

-  **NuttX-7.29** Configurations were added to verify the "Per-Window
   Framebuffer" feature also added in NuttX-7.29.

Refer to the LPCXpresso-LPC54628 board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/lpc54xx/lpcxpresso-lpc54628/README.txt>`__
file for more detailed information about this port.

NXP S32K14x
-----------

Support for the S32K14x family was added in NuttX-8.1. Two
boards are supported

-  **S32K146EVB**. A port to the S32K146EVB was included in NuttX-8.1.
   The initial release supports two full-featured NSH configurations.
   Refer to the S32K146EVB board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/s32k1xx/s32k146evb/README.txt>`__
   file for more detailed information about this port.
-  **S32K148EVB**. A port to the S32K148EVB was also provided in
   NuttX-8.1. The initial release supports two full-featured NSH
   configurations. Refer to the S32K148EVB board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/s32k1xx/s32k148evb/README.txt>`__
   file for more detailed information about this port.

Both boards featured two NSH configurations: One for execution out of
FLASH and a *safe* version that executes out of SRAM and, hence, cannot
lock up the system because of a bad FLASH image.

**Driver Status**.

-  **NuttX-8.1** The initial release for the S32K14x boards in NuttX
   included the following verfied drivers: Basic boot up logic, clock
   configuration, LPUART console, Systick timer, and GPIO controls.
   Additional complete-but-unverified drivers were also included: GPIO
   interrupts, eDMA, LPSPI, LPI2C, and Ethernet (S32K148 only).

TI/Stellaris LM4F120x
---------------------

This port uses the TI Stellaris LM4F120 LaunchPad.
Jose Pablo Carballo and I are doing this port.

TI/Tiva TM4C123G
----------------

This port uses the Tiva C Series TM4C123G LaunchPad
Evaluation Kit
`(EK-TM4C123GXL) <http://www.ti.com/tool/ek-tm4c123gxl>`__.

**TI Tiva TM4C123H**. Architectural support for the Tiva TM4C123AH6PM
was contributed in NuttX-8.1 by Nathan Hartman.

**STATUS:**

-  **NuttX-7.1**. Initial architectural support for the EK-TM4C123GXL
   was implemented and was released in NuttX 7.1. Basic board support
   the EK-TM4C123GXL was also included in that release but was not fully
   tested. This basic board support included a configuration for the
   NuttShell
   :ref:`NSH <nsh>`).
-  **NuttX-7.2**. The fully verified port to the EK-TM4C123GXL was
   provided in NuttX-7.2.
-  **NuttX-7.7**. An I2C driver was added in NuttX-7.7.
-  **NuttX-8.1**. Along with TM4C123AH6PM support, Nathan Hartman also
   reinstated and extended the Tiva Quadrature Encoder driver.

TI/Tiva TM4C1294
----------------

This port uses the TI Tiva C Series TM4C1294 Connected
LaunchPad `(EK-TM4C1294XL) <http://www.ti.com/tool/ek-tm4c1294xl>`__.

**STATUS:**

-  Support for the EK-TM4C1294XL was contributed by Frank Sautter and
   was released in NuttX 7.9. This basic board support included a
   configuration for the NuttShell
   :ref:`NSH <nsh>`) and a
   configuration for testing IPv6. See drivers for the `TI Tiva
   TM4C129X <#titm4c129x>`__.
-  FLASH and EEPROM drivers from Shirshak Sengupta were included in
   NuttX-7.25.

Refer to the EK-TM4C1294XL board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/tiva/tm4c1294-launchpad/README.txt>`__
file for more detailed information about this port.

TI/Tiva TM4C129E
----------------

This port uses the TI Tiva C Series TM4C129E Crypto Connected
LaunchPad `(EK-TM4C129EXL) <https://www.ti.com/tool/EK-TM4C129EXL>`__.

**STATUS:**

-  Support for the EK-TM4C129EXL is based on support for the similar
   EK-TM4C1294XL. This basic board support includes a configuration
   for the NuttShell :ref:`NSH <nsh>`), a configuration for testing
   IPv6, and a configuration for testing the RTOS using the ostest
   example in the NuttX apps repository.

Refer to the EK-TM4C129EXL board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/tiva/tm4c129e-launchpad/README.txt>`__
file for more detailed information about this port.

TI/Tiva TM4C129X
----------------

This port uses the TI Tiva C Series TM4C129X Connected
Development Kit `(DK-TM4C129X) <http://www.ti.com/tool/dk-tm4c129x>`__.

**STATUS:**

-  A mature port to the DK-TM4C129X was implemented and was released in
   NuttX 7.7.
-  At the initial release, verified drivers were available for Ethernet
   interface, I2C, and timers as well as board LEDs and push buttons.
   Other Tiva/Stellaris drivers should port to the TM4C129X without
   major difficulty.
-  This board supports included two configurations for the NuttShell
   (:ref:`NSH <nsh>`). Both
   are networked enabled: One configured to support IPv4 and one
   configured to supported IPv6. Instructions are included in the board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/tiva/dk-tm4c129x/README.txt>`__
   file for configuring both IPv4 and IPv6 simultaneously.
-  Tiva PWM and Quadrature Encoder drivers were contributed to NuttX in
   7.18 by Young.

Refer to the DK-TM4C129X board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/tiva/dk-tm4c129x/README.txt>`__
file for more detailed information about this port.

TI/SimpleLink CC13x2
--------------------

Basic, unverified architectural support for the
CC13x2 was added in NuttX-7.28. Fragmentary support for very similar
CC26x2 family is included. This is a work in progress and, with any
luck, a fully verified port will be available in NuttX-7.29. It is
currently code complete (minus some ROM *DriverLib* hooks) but untested.

**TI LaunchXL-CC1312R1**. Basic board support for the TI
LaunchXL-CC1312R1 board is in place. Board bring-up, however, cannot be
done until the the basic CC13x2 architecture support is complete,
hopefully in NuttX-7.29.

Microchip SAM4L
---------------

This port uses the Microchip SAM4L Xplained Pro development
board. This board features the ATSAM4LC4C MCU running at 48MHz with
256KB of FLASH and 32KB of internal SRAM.

**STATUS:** As of this writing, the basic port is code complete and a
fully verified configuration exists for the NuttShell
:ref:`NSH <nsh>`). The first
fully functional SAM4L Xplained Pro port was released in NuttX-6.28.
Support for the SAM4L Xplained modules was added in NuttX-6.29:

-  Support for the SPI-based SD card on the I/O1 module.
-  Driver for the LED1 segment LCD module.
-  Support for the UG-2832HSWEG04 OLED on the SAM4L Xplained Pro's OLED1
   module

Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/sam34/sam4l-xplained/README.txt>`__
file for further information.

**Memory Usage**. The ATSAM4LC4C comes in a 100-pin package and has
256KB FLASH and 32KB of SRAM. Below is the current memory usage for the
NSH configuration (June 9, 2013). This is *not* a minimal
implementation, but a full-featured NSH configuration.

Static memory usage can be shown with ``size`` command:

NuttX, the NSH application, and GCC libraries use 42.6KB of FLASH
leaving 213.4B of FLASH (83.4%) free from additional application
development. Static SRAM usage is about 2.3KB (<7%) and leaves 29.7KB
(92.7%) available for heap at runtime.

SRAM usage at run-time can be shown with the NSH ``free`` command. This
runtime memory usage includes the static memory usage *plus* all dynamic
memory allocation for things like stacks and I/O buffers:

You can see that 22.8KB (71.1%) of the SRAM heap is still available for
further application development while NSH is running.

Microchip SAM4CM
----------------

General architectural support was provided for SAM4CM
family in NuttX 7.3 This was *architecture-only* support, meaning that
support for the boards with these chips is available, but no support for
any publicly available boards was included. The SAM4CM port should be
compatible with most of the SAM3/4 drivers (like HSMCI, DMAC, etc.) but
those have not be verified on hardware as of this writing. This support
was contributed in part by Max Neklyudov.

**Microchip SAM4CMP-DB**. Support for the SAM4CMP-DB board was contributed
to NuttX by Masayuki Ishikawa in NuttX-7.19. The SAM4CM is a dual-CPU
part and SMP was included for the ARMv7-M and SAM3/4 families. The
SAM4CMP-DB board support includes an NSH configuration that operates in
an SMP configuration. Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/sam34/sam4cmp-db/README.txt>`__
file for further information.

Microchip SAM4E
---------------

General architectural support was provided for the SAM4E
family in NuttX 6.32. This was *architecture-only* support, meaning that
support for the boards with these chips is available, but no support for
any publicly available boards was included. This support was contributed
in part by Mitko.

**Microchip SAM4E-EK**. Board support was added for the SAM4E-EK development
board in NuttX 7.1. A fully functional NuttShell (NSH) configuration is
available (see :ref:`NSH <nsh>`). That NSH
configuration includes networking support and support for an AT25 Serial
FLASH file system.

Microchip SAM4S
---------------

There are ports to two Microchip SAM4S board:

-  There is a port the Microchip SAM4S Xplained development board. This
   board features the ATSAM4S16 MCU running at 120MHz with 1MB of FLASH
   and 128KB of internal SRAM.

-  There is also a port to the Microchip SAM4S Xplained *Pro* development
   board. This board features the ATSAM4S32C MCU running at 120MHz with
   2MB of FLASH and 160KB of internal SRAM.

Microchip SAM4E. General architectural support was provided for the SAM4E
family in NuttX 6.32. This was *architecture-only* support, meaning that
support for the boards with these chips is available, but no support for
any publicly available boards was included. This support was contributed
in part by Mitko.

**Microchip SAM4E-EK**. Board support was added for the SAM4E-EK development
board in NuttX 7.1. A fully functional NuttShell (NSH) configuration is
available (see :ref:`NSH <nsh>`). That NSH
configuration includes networking support and support for an AT25 Serial
FLASH file system.

**Development Environments:** 1) Linux with native Linux GNU toolchain,
2) Cygwin/MSYS with Cygwin GNU Cortex-M3 or 4 toolchain, 3) Cygwin/MSYS
with Windows native GNU Cortex-M3 or M4 toolchain (CodeSourcery or
devkitARM), or 4) Native Windows. A DIY toolchain for Linux or Cygwin is
provided by the NuttX
`buildroot <https://bitbucket.org/nuttx/buildroot/downloads/>`__
package.

ARM Cortex-M7
=============

Microchip SAMV71
----------------

This port uses Microchip SAM V71 Xplained Ultra Evaluation Kit
(SAMV71-XULT). This board features the ATSAMV71Q21 Cortex-M7
microcontroller. Refer to the `Microchip web
site <http://www.atmel.com/tools/atsamv71-xult.aspx>`__ for further
information about this board.

**STATUS:** The basic port is complete and there are several different,
verified configurations available. All configurations use the NuttShell
(NSH) and a serial console. The first release of the SAMV71-XULT port
was available in NuttX-7.9. Support for the connect maXTouch Xplained
Pro LCD as added in NuttX-7.10.

Additional drivers, with status as of 2015-04-03, include:

-  PIO configuration, including PIO interrupts,
-  On-board LEDs and buttons,
-  DMA,
-  SDRAM (not yet functional),
-  UART/USART-based serial drivers, including the NuttShell serial
   console,
-  High Speed Memory Card Interface (HSMCI) with support for the on
   board SD card slot,
-  SPI (not fully tested),
-  TWIHS/I2C, with the support for the on-board serial EEPROM,
-  SSC/I2S (not fully tested),
-  Ethernet MAC,
-  USB device controller driver (complete, partially functional, but not
   well tested).
-  On-board AT24 I2C EEPROM.
-  On-board WM8904 Audio CODEC with CS2100-CP Fractional-N Multiplier
   (not yet tested).
-  Support for the (optional) maXTouch Xplained Pro LCD module.

Additional Drivers added in NuttX-7.11 include:

-  MCAN CAN device driver (fully verified in loopback mode only).
-  SPI slave driver.

Additional Drivers added in NuttX-7.13 include:

-  MPU and protected build mode support.
-  Timer/Counter driver, one-shot timer, free-running timer support.
-  *Tickless* mode of operation.
-  QuadSPI driver.
-  Support for programming on-chip FLASH.

And in NuttX-7.14:

-  TRNG driver,
-  WDT driver, and
-  RSWDT driver.

Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/samv7/samv71-xult/README.txt>`__
file for further information.

Microchip SAME70
----------------

This port uses Microchip SAM E70 Xplained Evaluation Kit
(ATSAME70-XPLD). This board is essentially a lower cost version of the
SAMV71-XULT board featuring the ATSAME70Q21 Cortex-M7 microcontroller.
See the `Microchip SAMV71 <#at91samv71>`__ for supported features. Also
refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/samv7/same70-xplained/README.txt>`__
file for further information.

Microchip SAMD5x/E5x
--------------------

The port of NuttX to Adafruit Metro M4 development
board was released with NuttX-7/26. This board is essentially a advanced
version of the Adafruit Metro board based on the SAMD21, but upgraded to
the SAMD51, specifically the SAMD51J19. See the
`Adafruit <https://www.adafruit.com/product/3382>`__ web page for
additional information about the board.

A fully-function, basic NuttShell (NSH) configuration was was available
in this initial NuttX-7.26 release. That initial port verifies clock
configuration boot-up logic, SysTick timer, and SERCOM USART for the
serial console. The NSH configuration also includes use of the Cortex-M
Cache Controller (CMCC) which give the SAMD51's Cortex-M4 a performance
boost.

Because of the similarity in peripherals, several drivers were brought
in from the SAML21 port. Most have not been verified as of the
NuttX-7.26 release. These unverfied drivers include: SPI, I2C, DMA, USB.
Also refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/arm/samd5e5/metro-m4/README.txt>`__
file for further information about the current state of the port.

NuttX-9.0 added basic support for Microchip SAME54 Xplained Pro board.
An ethernet driver was also added to the SAME5x family.

STMicro STM32 F72x/F73x
-----------------------

Support for the F72x/F73x family was provided
by Bob Feretich in NuttX-7.23. A single board is supported in this
family:

**STATUS**: See `below <#stm32f7drivers>`__ for STM32 F7 driver
availability.

STMicro STM32 F745/F746
-----------------------

Three boards are supported for this MCU:

#. **STM32F746G Discovery**. One port uses the STMicro STM32F746G-DISCO
   development board featuring the STM32F746NGH6 MCU. The STM32F746NGH6
   is a 216MHz Cortex-M7 operation with 1024Kb Flash. The first release
   of the STM32F746G_DISCO port was available in NuttX-7.11. Refer to
   the `STMicro web site <http://www.st.com/stm32f7-discovery>`__ for
   further information about this board.

#. **Nucleo-144 board with STM32F746ZG**. A basic port for the
   Nucleo-144 board with the STM32F746ZG MCU was contributed in
   NuttX-7.16 by Kconstantin Berezenko.

STM32 F7 Driver Status:

-  **NuttX-7.11**. Serial driver and Ethernet driver support, along with
   DMA support, were available in this initial release. The STM32 F7
   peripherals are very similar to some members of the STM32 F4 and
   additional drivers can easily be ported the F7 as discussed in this
   Wiki page: `Porting Drivers to the STM32
   F7 <https://cwiki.apache.org/confluence/display/NUTTX/Porting+Drivers+to+the+STM32+F7>`__

-  **NuttX-7.17**. David Sidrane contributed PWR, RTC, BBSRAM, and
   DBGMCU support. Lok Tep contribed SPI, I2c, ADC, SDMMC, and USB
   device driver support.

-  **NuttX-7.22**. Titus von Boxberg also contributed LTDC support for
   the onboard LCD in NuttX-7.22.

-  **NuttX-7.29**. In NuttX-7.29, Valmantas Paliksa added a timer
   lowerhalf driver for STM32F7, ITM syslog support, a CAN driver with
   support for three bxCAN interfaces, and STM32F7 Quad SPI support.
   Support for DMA and USB OTG was added by Mateusz Szafoni in
   NuttX-7.29.

-  **NuttX-7.30**. From Eduard Niesner contributed a PWM driver. Added
   UID access from Valmantas Paliksa. USB High speed driver was added
   for STM32F7 series by Ramtin Amin.

-  **NuttX-9.0**. Added serial DMA support.

STMicro STM32 F756
------------------

Architecture-only support is available for the STM32
F756 family (meaning that the parts are supported, but there is no
example board supported in the system). This support was made available
in NuttX-7.11. See `above <#stm32f7drivers>`__ for STM32 F7 driver
availability.

STMicro STM32 F76xx/F77xx
-------------------------

Architecture support for the STM32 F76xx and
F77xx families was contributed by David Sidrane in NuttX 7.17. Support
is available for two boards from this family:

-  **Nucleo-F767ZI**. This is a member of the Nucleo-144 board family.
   Support for this board was also contributed by David Sidrane in
   NuttX-7.17. See the board
   `README.txt <https://github.com/apache/nuttx/blob/master/boards/arm/stm32f7/nucleo-144/README.txt>`__
   file for further information.

-  **STM32F76I-DISCO**. Support for the STM32F76I-DISCO was contributed
   by Titus von Boxberg in NuttX-7.22. The STMicro STM32F769I-DISCO
   development board features the STM32F769NIH6 MCU. The STM32F769NIH6
   is a 216MHz Cortex-M7 operating with 2048K Flash memory and 512Kb
   SRAM. The board features:

   -  On-board ST-LINK/V2 for programming and debugging,
   -  Mbed-enabled (mbed.org)
   -  4-inch 800x472 color LCD-TFT with capacitive touch screen
   -  SAI audio codec
   -  Audio line in and line out jack
   -  Two ST MEMS microphones
   -  SPDIF RCA input connector
   -  Two pushbuttons (user and reset)
   -  512-Mbit Quad-SPI Flash memory
   -  128-Mbit SDRAM
   -  Connector for microSD card
   -  RF-EEPROM daughterboard connector
   -  USB OTG HS with Micro-AB connectors
   -  Ethernet connector compliant with IEEE-802.3-2002 and PoE

   Refer to the http://www.st.com website for further information about
   this board (search keyword: stm32f769i-disco). See also the board
   `README.txt <https://github.com/apache/nuttx/blob/master/boards/arm/stm32f7/nucleo-144/README.txt>`__
   file for further information.

**STATUS**: See `above <#stm32f7drivers>`__ for STM32 F7 driver
availability.

STMicro STM32 H7x3
------------------

Architecture support for the STM32 H7x3 was added
through efforts of several people in NuttX-7.26. Support is available
for one board from this family:

-  **Nucleo-H743ZI**. This is a member of the Nucleo-144 board family.
   Support for this board was added in NuttX-7.26. See the board
   `README.txt <https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/nucleo-h743zi/README.txt>`__
   file for further information.

   The basic NSH configuration is fully, thanks to the bring-up efforts
   of Mateusz Szafoni. This port is still a work in progress and
   additional drivers are being ported from the F7 family.

-  **STMicro STM32H747I-DISCO**. Support for this board was added in
   NuttX-9.0. See the board
   `README.txt <https://github.com/apache/nuttx/blob/master/boards/arm/stm32h7/stm32h747i-disco/README.txt>`__
   file for further information.

   This port is still a work in progress.

**NuttX-7.30**. Added support for Ethernet, SDMMC, and Timer drivers.
All from Jukka Laitinen.

**NuttX-8.1**. Added support for BBSRAM, DTCM, RTC, and UID. All from
David Sidrane.

**NuttX-8.2**. Added support for SDMMC and FLASH progmem. From David
Sidrane.

**NuttX-9.0**. Added QSPI support for the STM32H7.

NXP/Freescale i.MX RT
---------------------

The initial port to the IMXRT1050-EVKB featuring
the MIMXRT1052DVL6A *Crossover* MCU was included initially in
NuttX-7.25. The initial port was the joint effort of Janne Rosberg, Ivan
Ucherdzhiev, and myself. Ivan gets credit for the bulk of the bring-up
work and for the Hyper FLASH boot logic.

Another port, this one for the IMXRT1060-EVKB featuring the
MIMXRT1062DVL6A *Crossover* MCU, was added by David Sidrane in
NuttX-7.27.

**STATUS:**

-  The basic IMXRT1050-EVK port is complete and verified configurations
   are available. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/imxrt/imxrt1050-evk/README.txt>`__
   file for further information.

-  The basic IMXRT1060-EVK port was complete but un-verified as of
   NuttX-7.27 but has been fully verified since NuttX-7.27 Refer to the
   NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/imxrt/imxrt1060-evk/README.txt>`__
   file for more current status information.

-  Architecture-only support for the IMXRT1020 family was contributed in
   NuttX-7.30 by Dave Marples.

-  The basic IMXRT1020-EVK port was complete with verified
   configurations in NuttX-8.2. This is again the work of Dave Marples.
   The initial release includes *nsh*, *netnsh*, and *usdhc*
   configurations. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/imxrt/imxrt1020-evk/README.txt>`__
   file for further information.

-  The basic Teensy-4.x port is complete. Refer to the NuttX board
   `README <https://github.com/apache/nuttx/blob/master/boards/arm/imxrt/teensy-4.x/README.txt>`__
   file for further information.

**i.MX RT Driver Status:**

-  **NuttX-7.25**. The initial release in NuttX-7.25 includes UART,
   Timer, GPIO, DMA, and Ethernet support (Ethernet support was
   contributed by Jake Choy).

-  **NuttX-7.26**. NuttX-7.26 added RTC, SNVS, and Serial TERMIOS
   support.

-  **NuttX-7.27**. NuttX-7.27 added LPI2C (from Ivan Ucherdzhiev) and SD
   card support via USDHC (from Dave Marples).

-  **NuttX-7.28**. GPIO support Input daisy selection was added in
   NuttX-7.28 by David Sidrane

-  **NuttX-7.29**. XBAR and OCOTP support was added in NuttX-7.28 by
   David Sidrane. LCD Framebuffer support was added by Johannes.

-  **NuttX-7.31**. USB EHCI Host and USDHC drivers were added in
   NuttX-7.31 by Dave Marples.

-  **NuttX-8.2**. An LCD drivers was added in NuttX-8.2 by Fabio
   Balzano.

   **NuttX-9.0**. Added USB Device support.

**Development Environments:** The same basic development environment is
recommended for the Cortex-M7 as for the Cortex-M4. It would be wise to
use the latest GNU toolchains for this part because as of this writing
(2015-02-09), support for the Cortex-M7 is a very new GCC feature.

Microchip AVR
=============

AVR ATMega
----------

AVR ATMega128
-------------

This port of NuttX to the Amber Web Server from
`SoC Robotics <http://www.soc-robotics.com/index.htm>`__ is partially
completed. The Amber Web Server is based on an Microchip ATMega128.

AVR ATMega1284P
---------------

LowPowerLab MoteinoMEGA. This port of NuttX to the MoteinoMEGA from
`LowPowerLab <http://www.lowpowerlab.com>`__. The MoteinoMEGA is based
on an Microchip ATMega1284P. See the LowPowerlab
`website <https://lowpowerlab.com/shop/index.php?_route_=Moteino/moteinomega>`__
and the board
`README <https://github.com/apache/nuttx/blob/master/boards/avr/atmega/moteino-mega/README.txt>`__
file for further information.

AVR ATMega2560
--------------

Extension of the AVR architecture to support the
ATMega2560 and specifi support for the Arduion MEGA2560 board were
contributed by Dimitry Kloper and first released in NuttX-7.14.

AVR AT90USB64x and AT90USB6128x
-------------------------------

**Micropendous 3 AT90USB64x** and **AT90USB6128x**. This port of NuttX
to the Opendous Micropendous 3 board. The Micropendous3 is may be
populated with an AT90USB646, 647, 1286, or 1287. I have only the
AT90USB647 version for testing. This version have very limited memory
resources: 64K of FLASH and 4K of SRAM.

**PJRC Teensy++ 2.0 AT90USB1286**. This is a port of NuttX to the PJRC
Teensy++ 2.0 board. This board was developed by
`PJRC <http://pjrc.com/teensy/>`__. The Teensy++ 2.0 is based on an
Microchip AT90USB1286 MCU.

**AVR-Specific Issues**. The basic AVR port is solid. The biggest issue
for using AVR is its tiny SRAM memory and its Harvard architecture.
Because of the Harvard architecture, constant data that resides to flash
is inaccessible using "normal" memory reads and writes (only SRAM data
can be accessed "normally"). Special AVR instructions are available for
accessing data in FLASH, but these have not been integrated into the
normal, general purpose OS.

Most NuttX test applications are console-oriented with lots of strings
used for ``printf()`` and debug output. These strings are all stored in
SRAM now due to these data accessing issues and even the smallest
console-oriented applications can quickly fill a 4-8K memory. So, in
order for the AVR port to be useful, one of two things would need to be
done:

#. Don't use console applications that required lots of strings. The
   basic AVR port is solid and your typical deeply embedded application
   should work fine. Or,
#. Create a special version of printf that knows how to access strings
   that reside in FLASH (or EEPROM).

**Development Environments:** 1) Linux with native Linux GNU toolchain,
2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS with Windows
native toolchain, or 4) Native Windows. All testing, however, has been
performed using the NuttX DIY toolchain for Linux or Cygwin is provided
by the NuttX
`buildroot <https://bitbucket.org/nuttx/buildroot/downloads/>`__
package. As a result, that toolchain is recommended.

Microchip AVR32
===============

AV32DEV1. This port uses the www.mcuzone.com AVRDEV1 board based on the
Microchip AT32UC3B0256 MCU. This port requires a special GNU avr32 toolchain
available from atmel.com website. This is a windows native toolchain and
so can be used only under Cygwin on Windows.

**STATUS:** This port is has completed all basic development, but there
is more that needs to be done. All code is complete for the basic NuttX
port including header files for all AT32UC3\* peripherals. The untested
AVR32 code was present in the 5.12 release of NuttX. Since then, the
basic RTOS port has solidified:

-  The port successfully passes the NuttX OS test
   (apps/examples/ostest).
-  A NuttShell (NSH) configuration is in place (see :ref:`NSH <nsh>`).
   Testing of that configuration has been postponed (because it got
   bumped by the Olimex LPC1766-STK port). Current Status: I think I
   have a hardware problem with my serial port setup. There is a good
   chance that the NSH port is complete and functional, but I am not yet
   able to demonstrate that. At present, I get nothing coming in the
   serial RXD line (probably because the pins are configured wrong or I
   have the MAX232 connected wrong).

The basic, port was be released in NuttX-5.13. A complete port will
include drivers for additional AVR32 UC3 devices -- like SPI and USB ---
and will be available in a later release, time permitting. Refer to the
NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/avr/at32uc3/avr32dev1/README.txt>`__
file for further information.

Misoc
=====

Misoc LM32 Architectural Support. Architectural support for the Misoc
LM32 was contributed by Ramtin Amin in NuttX 7.19

Minerva. Architectural support for the Misoc Minoerva was contributed by
Ramtin Amin in NuttX 7.29.

**Drivers**. Driver support is basic in these initial releases: Serial,
Timer, and Ethernet. "Board" support is a available for developing with
Misoc LM32 under Qemu or on your custom FPGA.

OpenRISC mor1kx
===============

**OpenRISC mor1kx Architectural Support**. Architectural support for the
OpenRISC mor1kx was developed by Matt Thompson Amin and released in
NuttX 7.25. Currently only an mor1kx Qemu simulation is available for
testing.

Freescale M68HCS12
==================

**MC9S12NE64**. Support for the MC9S12NE64 MCU and two boards are
included:

-  The Freescale DEMO9S12NE64 Evaluation Board, and
-  The Future Electronics Group NE64 /PoE Badge board.

Both use a GNU arm-nuttx-elf toolchain\* under Linux or Cygwin. The
NuttX `buildroot <https://bitbucket.org/nuttx/buildroot/downloads/>`__
provides a properly patched GCC 3.4.4 toolchain that is highly optimized
for the m9s12x family.

Intel 80x86
===========

**QEMU/Bifferboard i486**. This port uses the
`QEMU <http://wiki.qemu.org/Main_Page>`__ i486 and the native Linux,
Cygwin, MinGW the GCC toolchain under Linux or Cygwin.

**STATUS:** The basic port was code-complete in NuttX-5.19 and verified
in NuttX-6.0. The port was verified using the OS and NuttShell (NSH)
examples under QEMU. The port is reported to be functional on the
`Bifferboard <http://bifferos.bizhat.com>`__ as well. In NuttX 7.1,
Lizhuoyi contributed additional keyboard and VGA drivers. This is a
great, stable starting point for anyone interested in fleshing out the
x86 port! Refer to the NuttX
`README <https://github.com/apache/nuttx/blob/master/boards/x86/qemu/qemu-i486/README.txt>`__
file for further information.

**QEMU/Intel64** An x86_64 flat address port was ported in NuttX-9.0. It
consists of the following feautres:

-  - Runs in x86_64 long mode.
-  - Configurable SSE/AVX support.
-  - IRQs are managed by LAPIC(X2APIC) and IOAPIC.
-  - Used TSC_DEADLINE or APIC timer for systick.
-  - Pages are now maps the kernel at 4GB~, but changeable.

This kernel with ostest have been tested with

-  Qemu/KVM on a Xeon 2630v4 machine.
-  Bochs with broadwell_ult emulation.

Microchip PIC32MX
=================

(MIPS M4K architecture)

Microchip PIC32MX2xx
--------------------

A port is in progress from the DTX1-4000L "Mirtoo"
module from `Dimitech <http://www.dimitech.com/>`__. This module uses
Microchip PIC32MX250F128D and the Dimitech DTX1-4000L EV-kit1 V2. See
the `Dimitech <http://www.dimitech.com/>`__ website for further
information.

Microchip PIC32MX4xx
--------------------

**PIC32MX440F512H**. This port uses the "Advanced USB Storage Demo
Board," Model DB-DP11215, from `Sure
Electronics <http://www.sureelectronics.net>`__. This board features the
Microchip PIC32MX440F512H.

**PIC32MX460F512L**. There one two board ports using this chip:

-  **PIC32MX Board from PCB Logic Design Co**. This port is for the
   PIC32MX board from PCB Logic Design Co. and used the PIC32MX460F512L.
   The board is a very simple -- little more than a carrier for the
   PIC32 MCU plus voltage regulation, debug interface, and an OTG
   connector.
-  **UBW32 Board from Sparkfun** This is the port to the Sparkfun UBW32
   board. This port uses the `original
   v2.5 <http://www.sparkfun.com/products/8971>`__ board which is based
   on the Microchip PIC32MX460F512L. This older version has been
   replaced with this `newer
   board <http://www.sparkfun.com/products/9713>`__. See also the
   `UBW32 <http://www.schmalzhaus.com/UBW32/>`__ web site.

Microchip PIC32MX7xx
--------------------

PIC32MX795F512L. There one two board ports using this chip:

-  **Microchip PIC32 Ethernet Starter Kit**. This port uses the
   Microchip PIC32 Ethernet Starter Kit (DM320004) with the Expansion
   I/O board. See the `Microchip website <http://www.microchip.com>`__
   for further information.
-  **Mikroelektronika PIC32MX7 Mulitmedia Board (MMB)**. A port has been
   completed for the Mikroelektronika PIC32MX7 Multimedia Board (MMB).
   See http://www.mikroe.com/ for further information about this board.

**Development Environment:** These ports uses either:

#. The *LITE* version of the PIC32MX toolchain available for download
   from the `Microchip <http://www.microchip.com>`__ website, or
#. The Pinguino MIPS ELF toolchain available from the Pinguino
   `website <https://code.google.com/archive/p/pinguino32/>`__.
#. The MIPS SDE toolchain available from the `Mentor
   Graphics <http://www.mentor.com>`__ website.

Microchip PIC32MZEC
-------------------

PIC32MZEC Family (MIPS microAptiv). A port is in available for the
PIC32MZ Embedded Connectivity (EC) Starter Kit. There are two
configurations of the Microchip PIC32MZ EC Starter Kit:

#. The PIC32MZ Embedded Connectivity Starter Kit based on the
   PIC32MZ2048ECH144-I/PH chip (DM320006), and
#. The PIC32MZ Embedded Connectivity Starter Kit based on the
   PIC32MZ2048ECM144-I/PH w/Crypto Engine (DM320006-C).

See the `Microchip <http://www.microchip.com>`__ website for further
information.

This was a collaborative effort between Kristopher Tate, David Sidrane
and myself. The basic port is functional and a NuttShell (NSH)
configuration is available.

Microchip PIC32MZEF
===================

(MIPS M5150 architecture).

A port is in available for the MikroElectronika `Flip&Click
PIC32MZ <https://www.mikroe.com/flipclick-pic32mz>`__ development board
based on the PIC32MZ2048EFH100 MCU. This board configuration was added
in NuttX-7.24 and is, for the most part, compatible with the PIC32MZEC
family.

**STATUS:**

**NuttX-7.9**. The first official release was in NuttX-7.9. Many drivers
port simply from the PIC32MX; others require more extensive efforts.
Driver status as of (2015-03-29) is provided below:

-  I/O ports include I/O port interrupts
-  UART serial driver that provides the NSH console,
-  Timer,
-  I2C (untested),
-  SPI (untested),
-  On-board buttons and LEDs,
-  Ethernet (code complete, but not yet functional),

**NuttX-7.29**. Abdelatif Guettouche contributed additional timer
support including: Timer lower half driver, free-running, and one-shot
timers.

**NuttX-7.31**. Abdelatif Guettouche contributed DMA support.

**NuttX-9.0**. Cache operations were implemented.

Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/mips/pic32mz/pic32mz-starterkit/README.txt>`__
file for further information.

**Development Environment:** Same as for the PIC32MZ.

Renesas/Hitachi SuperH
======================

**SH-1 SH7032**. This port uses the Hitachi SH-1 Low-Cost Evaluation
Board (SH1_LCEVB1), US7032EVB, with a GNU ELF toolchain\* under Linux or
Cygwin.

Renesas M16C/26
---------------

**Renesas M16C/26 Microcontroller**. This port uses the Renesas SKP16C26
Starter kit and the GNU M32C toolchain. The development environment is
either Linux or Cygwin under WinXP.

**STATUS:** Initial source files released in nuttx-0.4.2. At this point,
the port has not been integrated; the target cannot be built because the
GNU ``m16c-nuttx-elf-ld`` link fails with the following message:

Where the reference line is:

No workaround is known at this time. This is a show stopper for M16C.
Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/renesas/m16c/skp16c26/README.txt>`__
file for further information.

Renesas RX65N
-------------

Support for the Renesas RX65N family was released in NuttX with a
contribution from Anjana. Two boards are supported in this initial
release:

-  **RSK RX65N-2MB**.
-  **GR-Rose**.

**STATUS**

-  **NuttX-8.2**
-  **NuttX-9.0** RTC driver for the RX65N was added.

RISC-V
======

RISC-V Architectural Support. Basic support for the RISC-V architecture
was contributed by Ken Pettit in NuttX-7.19.

`Sipeed Maix bit <#k210>`__

Initial support for the Sipeed Maix bit board was added in NuttX-9.0.

LiteX on ARTY A7
----------------

Support for the Digilent ARTY_A7 board along with CPU VexRiscV SOC were
added in NuttX-9.0.

ESP32-C3
--------

Initial architectural support for ESP32-C3 (RISC-V) was added in NuttX-10.1.0

**Espressif ESP32-C3 Devkit Board** The NuttX release includes support for
Espressif ESP32-C3 Devkit board.

Please, refer to the :doc:`ESP32-C3 </platforms/risc-v/esp32c3/index>` on NuttX for
further information.

ESP32 (Dual Xtensa LX6)
=======================

Xtensa LX6 ESP32
----------------

Initial architectural support for Xtensa LX6 processors for the Espressif
ESP32 was added in NuttX-7.19, enabling both single CPU and dual CPU
SMP configurations.

**Espressif ESP32 DevkitC V4 Board** The NuttX release includes support for
Espressif ESP32 DevkitC V4 board. There is an NSH configuration for each
CPU configuration and an OS test configuration for verification of the
port.

**STATUS**. Release NuttX-10.0.0 brought a bunch of additions to the ESP32 port.  This
includes: I2C, SPI, RTC, PM, Timers, Watchdog Timer and Ethernet.

Please, refer to the :doc:`ESP32 </platforms/xtensa/esp32/index>` on NuttX for
further information.

ESP32-S2 (Single Xtensa LX7)
============================

Xtensa LX7 ESP32-S2
-------------------

Initial architectural support for Xtensa LX7 processor for the Espressif
ESP32-S2 was added in NuttX-10.2.

**Espressif ESP32-S2 Saola V1 Board** The NuttX release includes support for
Espressif ESP32-S2 Saola V1 board.

Please, refer to the :doc:`ESP32-S2 </platforms/xtensa/esp32s2/index>` on NuttX for
further information.

ESP32-S3 (Dual Xtensa LX7)
==========================

Xtensa LX7 ESP32-S3
-------------------

Initial architectural support for dual Xtensa LX7 processors for the Espressif
ESP32-S3 was added in NuttX-10.3.

**Espressif ESP32-S3 DevKit Board** The NuttX release includes support for
Espressif ESP32-S3 DevKit board.

Please, refer to the :doc:`ESP32-S3 </platforms/xtensa/esp32s3/index>` on NuttX for
further information.

Zilog ZNEO Z16F
===============

**Zilog z16f2800100zcog development kit**. This port use the Zilog
z16f2800100zcog development kit and the Zilog ZDS-II Windows command
line tools. The development environment is either Windows native or
Cygwin under Windows.

**STATUS:** The initial release of support for the z16f was made
available in NuttX version 0.3.7. A working NuttShell (NSH)
configuration as added in NuttX-6.33 (although a patch is required to
work around an issue with a ZDS-II 5.0.1 tool problem). An ESPI
driver was added in NuttX-7.2. Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/z16/z16f/z16f2800100zcog/README.txt>`__
file for further information.

Zilog eZ80 Acclaim!
===================

**Zilog eZ80Acclaim! Microcontroller**. There are four eZ80Acclaim!
ports:

-  The ZiLOG ez80f0910200kitg development kit.
-  The ZiLOG ez80f0910200zcog-d development kit.
-  The MakerLisp CPU board.
-  The Z20x DIY computing system.

All three boards are based on the eZ80F091 part and all use the Zilog
ZDS-II Windows command line tools. The development environment is either
Windows native or Cygwin or MSYS2 under Windows.

It is also possible to compile using ``clang`` and the GNU ``binutils``
toolchain. You must have a variant of ``clang`` that supports the eZ80,
and an install of ``binutils`` built with Z80 support.

``clang`` with eZ80 support is available as part of the Texas Instruments
CE 85+ unofficial `toolchain <https://ce-programming.github.io/toolchain/>`
and requires a further `patch <https://github.com/codebje/ez80-toolchain/tree/master/clang>`
to support GNU assembler syntax.

GNU ``binutils`` supports the Z80 family. It will require compilation with
appropriate configuration to enable support.

C intrinsics are also required. Some may be found in the Zilog ZDS-II
distribution, requiring some modification to build with the GNU assembler.
Additional intrinsics for 64-bit support must be supplied.

Zilog Z8Encore!
===============

**Zilog Z8Encore! Microcontroller**. This port uses the either:

-  Zilog z8encore000zco development kit, Z8F6403 part, or
-  Zilog z8f64200100kit development kit, Z8F6423 part

and the Zilog ZDS-II Windows command line tools. The development
environment is either Windows native or Cygwin under Windows.

**STATUS:** This release has been verified only on the ZiLOG ZDS-II
Z8Encore! chip simulation as of nuttx-0.3.9. Refer to the NuttX board
README files for the
`z8encore000zco <https://github.com/apache/nuttx/blob/master/boards/z80/z8/z8encore000zco/README.txt>`__
and for
the\ `z8f64200100kit <https://github.com/apache/nuttx/blob/master/boards/z80/z8/z8f64200100kit/README.txt>`__
for further information.

Zilog Z180
==========

**P112**. The P112 is a hobbyist single board computer based on a 16MHz
Z80182 with up to 1MB of memory, serial, parallel and diskette IO, and
realtime clock, in a 3.5-inch drive form factor. The P112 computer
originated as a commercial product of "D-X Designs Pty Ltd"[ of
Australia.

Dave Brooks was successfully funded through Kickstarter for and another
run of P112 boards in November of 2012. In addition Terry Gulczynski
makes additional P112 derivative hobbyist home brew computers.

**STATUS:** Most of the NuttX is in port for both the Z80182 and for the
P112 board. Boards from Kickstarter project will not be available,
however, until the third quarter of 2013. So it will be some time before
this port is verified on hardware. Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/z80/z180/p112/README.txt>`__
file for further information.

Zilog Z80
=========

**Z80 Instruction Set Simulator**. This port uses the
`SDCC <http://sdcc.sourceforge.net/>`__ toolchain under Linux or Cygwin
(verified using version 2.6.0). This port has been verified using only a
Z80 instruction simulator called z80sim.

**STATUS:** This port is complete and stable to the extent that it can
be tested using an instruction set simulator. Refer to the NuttX board
`README <https://github.com/apache/nuttx/blob/master/boards/z80/z80/z80sim/README.txt>`__
file for further information.

**XTRS: TRS-80 Model I/III/4/4P Emulator for Unix**. A very similar Z80
port is available for `XTRS <http://www.tim-mann.org/xtrs.html>`__, the
TRS-80 Model I/III/4/4P Emulator for Unix. That port also uses the
`SDCC <http://sdcc.sourceforge.net/>`__ toolchain under Linux or Cygwin
(verified using version 2.6.0).

**STATUS:** Basically the same as for the Z80 instruction set simulator.
This port was contributed by Jacques Pelletier. Refer to the NuttX board
`README <https://bitbucket.org/patacongo/obsoleted/src/master/configs/xtrs/README.txt>`__
file for further information.

**NOTE:** This port was removed from the NuttX source tree on
2017-11-24. It was removed because (1) it is unfinished, unverified, and
unsupported, and (2) the TRS-80 simulation is a sub-optimal platform.i
That platform includes a 16-bit ROM image and only a 48Kb RAM space for
NuttX. The removed board support is still available in the ``Obsoleted``
repository if anyone would ever like to resurrect it.

   \* A highly modified `buildroot <http://buildroot.uclibc.org/>`__ is
   available that may be used to build a NuttX-compatible ELF toolchain
   under Linux or Cygwin. Configurations are available in that buildroot
   to support ARM, Cortex-M3, avr, m68k, m68hc11, m68hc12, m9s12,
   blackfin, m32c, h8, and SuperH ports.