Support for the Atmel SAM4S Xplaiend Board from Bob Doison

19 files changed, 3041 insertions, 0 deletions

diff --git a/nuttx/ChangeLog b/nuttx/ChangeLog
index f86a23b6a..0d7a1f938 100644
--- a/nuttx/ChangeLog
+++ b/nuttx/ChangeLog
@@ -7228,4 +7228,6 @@
 	* arch/arm/src/sam34/sam_hsmci.c and chip/sam_hsmci.h:  Extensions
 	  from Bob Doiron needed to support PDC-based HSMCI DMA transfers
 	  (2014-4-21).
+	* configs/sam4s-xplained-pro:  Support for the SAM4S Xplained Pro
+	  board from Bob Doison (2014-4-21).
 
diff --git a/nuttx/Documentation/README.html b/nuttx/Documentation/README.html
index 26f0b8212..1fe8757bf 100644
--- a/nuttx/Documentation/README.html
+++ b/nuttx/Documentation/README.html
@@ -177,6 +177,8 @@
  |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/sam4l-xplained/README.txt"><b><i>README.txt</i></b></a>
  |   |   |- sam4s-xplained/
  |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/sam4s-xplained/README.txt"><b><i>README.txt</i></b></a>
+ |   |   |- sam4s-xplained-pro/
+ |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/sam4s-xplained-pro/README.txt"><b><i>README.txt</i></b></a>
  |   |   |- shenzhou/
  |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/shenzhou/README.txt"><b><i>README.txt</i></b></a>
  |   |   |- sim/
diff --git a/nuttx/README.txt b/nuttx/README.txt
index 41d404051..fa8d06c54 100644
--- a/nuttx/README.txt
+++ b/nuttx/README.txt
@@ -1041,6 +1041,8 @@ nuttx
  |   |   `- README.txt
  |   |- sam4s-xplained/
  |   |   `- README.txt
+ |   |- sam4s-xplained-pro/
+ |   |   `- README.txt
  |   |- sim/
  |   |   `- README.txt
  |   |- shenzhou/
diff --git a/nuttx/configs/Kconfig b/nuttx/configs/Kconfig
index cb8a5ee3a..1a2d90aa8 100644
--- a/nuttx/configs/Kconfig
+++ b/nuttx/configs/Kconfig
@@ -599,6 +599,15 @@ config ARCH_BOARD_SAM4L_XPLAINED
 	---help---
 		The port of NuttX to the Atmel SAM4L-Xplained Pro development board.
 
+config ARCH_BOARD_SAM4S_XPLAINED_PRO
+	bool "Atmel SAM4S-Xplained Pro development board"
+	depends on ARCH_CHIP_ATSAM4SD32C
+	select ARCH_HAVE_LEDS
+	select ARCH_HAVE_BUTTONS
+	select ARCH_HAVE_IRQBUTTONS
+	---help---
+		The port of NuttX to the Atmel SAM4S-Xplained Pro development board.
+
 config ARCH_BOARD_SAM4S_XPLAINED
 	bool "Atmel SAM4S-Xplained development board"
 	depends on ARCH_CHIP_ATSAM4S16C
@@ -980,6 +989,7 @@ config ARCH_BOARD
 	default "sam4e-ek"            if ARCH_BOARD_SAM4EEK
 	default "sam4l-xplained"      if ARCH_BOARD_SAM4L_XPLAINED
 	default "sam4s-xplained"      if ARCH_BOARD_SAM4S_XPLAINED
+	default "sam4s-xplained-pro"  if ARCH_BOARD_SAM4S_XPLAINED_PRO
 	default "shenzhou"            if ARCH_BOARD_SHENZHOU
 	default "skp16c26"            if ARCH_BOARD_SKP16C26
 	default "spark"               if ARCH_BOARD_SPARK
@@ -1246,6 +1256,9 @@ endif
 if ARCH_BOARD_SAM4S_XPLAINED
 source "configs/sam4s-xplained/Kconfig"
 endif
+if ARCH_BOARD_SAM4S_XPLAINED_PRO
+source "configs/sam4s-xplained-pro/Kconfig"
+endif
 if ARCH_BOARD_SHENZHOU
 source "configs/shenzhou/Kconfig"
 endif
diff --git a/nuttx/configs/README.txt b/nuttx/configs/README.txt
index 959e1942f..affa5601a 100644
--- a/nuttx/configs/README.txt
+++ b/nuttx/configs/README.txt
@@ -489,6 +489,12 @@ configs/sam4e-ek
 configs/sam4l-xplained
   The port of NuttX to the Atmel SAM4L-Xplained development board.
 
+configs/sam4s-xplained
+  The port of NuttX to the Atmel SAM4S-Xplained development board.
+
+configs/sam4s-xplained-pro
+  The port of NuttX to the Atmel SAM4S-Xplained Pro development board.
+
 configs/sim
   A user-mode port of NuttX to the x86 Linux platform is available.
   The purpose of this port is primarily to support OS feature development.
diff --git a/nuttx/configs/sam4s-xplained-pro/Kconfig b/nuttx/configs/sam4s-xplained-pro/Kconfig
new file mode 100644
index 000000000..a2d3b9ad5
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/Kconfig
@@ -0,0 +1,7 @@
+#
+# For a description of the syntax of this configuration file,
+# see misc/tools/kconfig-language.txt.
+#
+
+if ARCH_BOARD_SAM4S_XPLAINED_PRO
+endif
diff --git a/nuttx/configs/sam4s-xplained-pro/README.txt b/nuttx/configs/sam4s-xplained-pro/README.txt
new file mode 100644
index 000000000..24d7f0028
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/README.txt
@@ -0,0 +1,640 @@
+README
+^^^^^^
+
+  This README discusses issues unique to NuttX configurations for the
+  Atmel SAM4S Xplained development board.  This board features the
+  ATSAM4S16C MCU with 1MB FLASH and 128KB.
+
+  The SAM4S Xplained features:
+
+    - 120 MHz Cortex-M4 with MPU
+    - 12MHz crystal (no 32.768KHz crystal)
+    - Segger J-Link JTAG emulator on-board for program and debug
+    - MICRO USB A/B connector for USB connectivity
+    - IS66WV51216DBLL ISSI SRAM 8Mb 512K x 16 55ns PSRAM 2.5v-3.6v
+    - Four Atmel QTouch buttons
+    - External voltage input
+    - Four LEDs, two controllable from software
+    - Xplained expansion headers
+    - Footprint for external serial Flash (not fitted)
+
+Contents
+^^^^^^^^
+
+  - PIO Muliplexing
+  - Development Environment
+  - GNU Toolchain Options
+  - IDEs
+  - NuttX EABI "buildroot" Toolchain
+  - NuttX OABI "buildroot" Toolchain
+  - NXFLAT Toolchain
+  - Buttons and LEDs
+  - Serial Consoles
+  - SAM4S Xplained-specific Configuration Options
+  - Configurations
+
+PIO Muliplexing
+^^^^^^^^^^^^^^^
+
+  PA0   SMC_A17                  PB0   J2.3 default   PC0   SMC_D0
+  PA1   SMC_A18                  PB1   J2.4           PC1   SMC_D1
+  PA2   J3.7 default             PB2   J1.3 & J4.3    PC2   SMC_D2
+  PA3   J1.1 & J4.1              PB3   J1.4 & J4.4    PC3   SMC_D3
+  PA4   J1.2 & J4.2              PB4   JTAG           PC4   SMC_D4
+  PA5   User_button BP2          PB5   JTAG           PC5   SMC_D5
+  PA6   J3.7 optional            PB6   JTAG           PC6   SMC_D6
+  PA7   CLK_32K                  PB7   JTAG           PC7   SMC_D7
+  PA8   CLK_32K                  PB8   CLK_12M        PC8   SMC_NWE
+  PA9   RX_UART0                 PB9   CLK_12M        PC9   Power on detect
+  PA10  TX_UART0                 PB10  USB_DDM        PC10  User LED D9
+  PA11  J3.2 default             PB11  USB_DDP        PC11  SMC_NRD
+  PA12  MISO                     PB12  ERASE          PC12  J2.2
+  PA13  MOSI                     PB13  J2.3 optional  PC13  J2.7
+  PA14  SPCK                     PB14  N/A            PC14  SMC_NCS0
+  PA15  J3.5                                          PC15  SMC_NSC1
+  PA16  J3.6                                          PC16  N/A
+  PA17  J2.5                                          PC17  User LED D10
+  PA18  J3.4 & SMC_A14                                PC18  SMC_A0
+  PA19  J3.4 optional & SMC_A15                       PC19  SMC_A1
+  PA20  J3.1 & SMC_A16                                PC20  SMC_A2
+  PA21  J2.6                                          PC21  SMC_A3
+  PA22  J2.1                                          PC22  SMC_A4
+  PA23  J3.3                                          PC23  SMC_A5
+  PA24  TSLIDR_SL_SN                                  PC24  SMC_A6
+  PA25  TSLIDR_SL_SNSK                                PC25  SMC_A7
+  PA26  TSLIDR_SM_SNS                                 PC26  SMC_A8
+  PA27  TSLIDR_SM_SNSK                                PC27  SMC_A9
+  PA28  TSLIDR_SR_SNS                                 PC28  SMC_A10
+  PA29  TSLIDR_SR_SNSK                                PC29  SMC_A11
+  PA30  J4.5                                          PC30  SMC_A12
+  PA31  J1.5                                          PC31  SMC_A13
+
+Development Environment
+^^^^^^^^^^^^^^^^^^^^^^^
+
+  Several possibile development enviorments may be use:
+
+  - Linux or OSX native
+  - Cygwin unders Windows
+  - MinGW + MSYS under Windows
+  - Windows native (with GNUMake from GNUWin32).
+
+  All testing has been performed using Cygwin under Windows.
+
+  The source has been built only using the GNU toolchain (see below).  Other
+  toolchains will likely cause problems.
+
+GNU Toolchain Options
+^^^^^^^^^^^^^^^^^^^^^
+
+  The NuttX make system has been modified to support the several different
+  toolchain options.
+
+  All testing has been conducted using the NuttX buildroot toolchain.  To use
+  the CodeSourcery, devkitARM or Raisonance GNU toolchain, you simply need to
+  add one of the following configuration options to your .config (or defconfig)
+  file:
+
+    CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYW=y  : CodeSourcery under Windows
+    CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYL=y  : CodeSourcery under Linux
+    CONFIG_ARMV7M_TOOLCHAIN_ATOLLIC=y        : Atollic toolchain for Windos
+    CONFIG_ARMV7M_TOOLCHAIN_DEVKITARM=y      : devkitARM under Windows
+    CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y      : NuttX buildroot under Linux or Cygwin (default)
+    CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIL=y      : Generic GCC ARM EABI toolchain for Linux
+    CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIW=y      : Generic GCC ARM EABI toolchain for Windows
+
+  If you are not using CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT, then you may also
+  have to modify the PATH in the setenv.h file if your make cannot find the
+  tools.
+
+  NOTE about Windows native toolchains
+  ------------------------------------
+
+  The CodeSourcery (for Windows), Atollic, and devkitARM toolchains are
+  Windows native toolchains.  The CodeSourcery (for Linux), NuttX buildroot,
+  and, perhaps, the generic GCC toolchains are Cygwin and/or Linux native
+  toolchains. There are several limitations to using a Windows based
+  toolchain in a Cygwin environment.  The three biggest are:
+
+  1. The Windows toolchain cannot follow Cygwin paths.  Path conversions are
+     performed automatically in the Cygwin makefiles using the 'cygpath' utility
+     but you might easily find some new path problems.  If so, check out 'cygpath -w'
+
+  2. Windows toolchains cannot follow Cygwin symbolic links.  Many symbolic links
+     are used in Nuttx (e.g., include/arch).  The make system works around these
+     problems for the Windows tools by copying directories instead of linking them.
+     But this can also cause some confusion for you:  For example, you may edit
+     a file in a "linked" directory and find that your changes had no effect.
+     That is because you are building the copy of the file in the "fake" symbolic
+     directory.  If you use a Windows toolchain, you should get in the habit of
+     making like this:
+
+       make clean_context all
+
+     An alias in your .bashrc file might make that less painful.
+
+  3. Dependencies are not made when using Windows versions of the GCC.  This is
+     because the dependencies are generated using Windows pathes which do not
+     work with the Cygwin make.
+
+       MKDEP                = $(TOPDIR)/tools/mknulldeps.sh
+
+  NOTE 1: Older CodeSourcery toolchains (2009q1) do not work with default
+  optimization level of -Os (See Make.defs).  It will work with -O0, -O1, or
+  -O2, but not with -Os.
+
+  NOTE 2: The devkitARM toolchain includes a version of MSYS make.  Make sure that
+  the paths to Cygwin's /bin and /usr/bin directories appear BEFORE the devkitARM
+  path or will get the wrong version of make.
+
+IDEs
+^^^^
+
+  NuttX is built using command-line make.  It can be used with an IDE, but some
+  effort will be required to create the project (There is a simple RIDE project
+  in the RIDE subdirectory).
+
+  Makefile Build
+  --------------
+  Under Eclipse, it is pretty easy to set up an "empty makefile project" and
+  simply use the NuttX makefile to build the system.  That is almost for free
+  under Linux.  Under Windows, you will need to set up the "Cygwin GCC" empty
+  makefile project in order to work with Windows (Google for "Eclipse Cygwin" -
+  there is a lot of help on the internet).
+
+  Native Build
+  ------------
+  Here are a few tips before you start that effort:
+
+  1) Select the toolchain that you will be using in your .config file
+  2) Start the NuttX build at least one time from the Cygwin command line
+     before trying to create your project.  This is necessary to create
+     certain auto-generated files and directories that will be needed.
+  3) Set up include pathes:  You will need include/, arch/arm/src/sam34,
+     arch/arm/src/common, arch/arm/src/armv7-m, and sched/.
+  4) All assembly files need to have the definition option -D __ASSEMBLY__
+     on the command line.
+
+  Startup files will probably cause you some headaches.  The NuttX startup file
+  is arch/arm/src/sam34/sam_vectors.S.  You may need to build NuttX
+  one time from the Cygwin command line in order to obtain the pre-built
+  startup object needed by RIDE.
+
+NuttX EABI "buildroot" Toolchain
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+  A GNU GCC-based toolchain is assumed.  The files */setenv.sh should
+  be modified to point to the correct path to the Cortex-M3 GCC toolchain (if
+  different from the default in your PATH variable).
+
+  If you have no Cortex-M3 toolchain, one can be downloaded from the NuttX
+  SourceForge download site (https://sourceforge.net/projects/nuttx/files/buildroot/).
+  This GNU toolchain builds and executes in the Linux or Cygwin environment.
+
+  1. You must have already configured Nuttx in <some-dir>/nuttx.
+
+     cd tools
+     ./configure.sh sam4s-xplained-pro/<sub-dir>
+
+  2. Download the latest buildroot package into <some-dir>
+
+  3. unpack the buildroot tarball.  The resulting directory may
+     have versioning information on it like buildroot-x.y.z.  If so,
+     rename <some-dir>/buildroot-x.y.z to <some-dir>/buildroot.
+
+  4. cd <some-dir>/buildroot
+
+  5. cp configs/cortexm3-eabi-defconfig-4.6.3 .config
+
+  6. make oldconfig
+
+  7. make
+
+  8. Edit setenv.h, if necessary, so that the PATH variable includes
+     the path to the newly built binaries.
+
+  See the file configs/README.txt in the buildroot source tree.  That has more
+  details PLUS some special instructions that you will need to follow if you are
+  building a Cortex-M3 toolchain for Cygwin under Windows.
+
+  NOTE:  Unfortunately, the 4.6.3 EABI toolchain is not compatible with the
+  the NXFLAT tools.  See the top-level TODO file (under "Binary loaders") for
+  more information about this problem. If you plan to use NXFLAT, please do not
+  use the GCC 4.6.3 EABI toochain; instead use the GCC 4.3.3 OABI toolchain.
+  See instructions below.
+
+NuttX OABI "buildroot" Toolchain
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+  The older, OABI buildroot toolchain is also available.  To use the OABI
+  toolchain:
+
+  1. When building the buildroot toolchain, either (1) modify the cortexm3-eabi-defconfig-4.6.3
+     configuration to use EABI (using 'make menuconfig'), or (2) use an exising OABI
+     configuration such as cortexm3-defconfig-4.3.3
+
+  2. Modify the Make.defs file to use the OABI conventions:
+
+    +CROSSDEV = arm-nuttx-elf-
+    +ARCHCPUFLAGS = -mtune=cortex-m3 -march=armv7-m -mfloat-abi=soft
+    +NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-gotoff.ld -no-check-sections
+    -CROSSDEV = arm-nuttx-eabi-
+    -ARCHCPUFLAGS = -mcpu=cortex-m3 -mthumb -mfloat-abi=soft
+    -NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
+
+NXFLAT Toolchain
+^^^^^^^^^^^^^^^^
+
+  If you are *not* using the NuttX buildroot toolchain and you want to use
+  the NXFLAT tools, then you will still have to build a portion of the buildroot
+  tools -- just the NXFLAT tools.  The buildroot with the NXFLAT tools can
+  be downloaded from the NuttX SourceForge download site
+  (https://sourceforge.net/projects/nuttx/files/).
+
+  This GNU toolchain builds and executes in the Linux or Cygwin environment.
+
+  1. You must have already configured Nuttx in <some-dir>/nuttx.
+
+     cd tools
+     ./configure.sh sam4s-xplained-pro/<sub-dir>
+
+  2. Download the latest buildroot package into <some-dir>
+
+  3. unpack the buildroot tarball.  The resulting directory may
+     have versioning information on it like buildroot-x.y.z.  If so,
+     rename <some-dir>/buildroot-x.y.z to <some-dir>/buildroot.
+
+  4. cd <some-dir>/buildroot
+
+  5. cp configs/cortexm3-defconfig-nxflat .config
+
+  6. make oldconfig
+
+  7. make
+
+  8. Edit setenv.h, if necessary, so that the PATH variable includes
+     the path to the newly builtNXFLAT binaries.
+
+Buttons and LEDs
+^^^^^^^^^^^^^^^^
+
+  Buttons
+  -------
+
+  The SAM4S Xplained has two mechanical buttons. One button is the RESET button
+  connected to the SAM4S reset line and the other is a generic user configurable
+  button labeled BP2 and connected to GPIO PA5. When a button is pressed it
+  will drive the I/O line to GND.
+
+  LEDs
+  ----
+
+  There are four LEDs on board the SAM4X Xplained board, two of these can be
+  controlled by software in the SAM4S:
+
+      LED              GPIO
+      ---------------- -----
+      D9  Yellow LED   PC10
+      D10 Yellow LED   PC17
+
+  Both can be illuminated by driving the GPIO output to ground (low).
+
+  These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
+  defined.  In that case, the usage by the board port is defined in
+  include/board.h and src/sam_leds.c. The LEDs are used to encode OS-related
+  events as follows:
+
+    SYMBOL                Meaning                     LED state
+                                                    D9       D10
+    -------------------  -----------------------  -------- --------
+    LED_STARTED          NuttX has been started     OFF      OFF
+    LED_HEAPALLOCATE     Heap has been allocated    OFF      OFF
+    LED_IRQSENABLED      Interrupts enabled         OFF      OFF
+    LED_STACKCREATED     Idle stack created         ON       OFF
+    LED_INIRQ            In an interrupt              No change
+    LED_SIGNAL           In a signal handler          No change
+    LED_ASSERTION        An assertion failed          No change
+    LED_PANIC            The system has crashed     OFF      Blinking
+    LED_IDLE             MCU is is sleep mode         Not used
+
+  Thus if D9 is statically on, NuttX has successfully booted and is,
+  apparently, running normmally.  If D10 is flashing at approximately
+  2Hz, then a fatal error has been detected and the system has halted.
+
+Serial Consoles
+^^^^^^^^^^^^^^^
+
+  UART1
+  -----
+  If you have a TTL to RS-232 convertor then this is the most convenient
+  serial console to use.  UART1 is the default in all of these
+  configurations.
+
+    UART1 RXD  PB2   J1 pin 3   J4 pin 3
+    UART1 TXD  PB3   J1 pin 4   J4 pin 4
+    GND              J1 pin 9   J4 pin 9
+    Vdd              J1 pin 10  J4 pin 10
+
+  USART1
+  ------
+  USART1 is another option:
+
+    USART1 RXD PA21  J2 pin 6
+    USART1 TXD PA22  J2 pin 1
+    GND              J2 pin 9
+    Vdd              J2 pin 10
+
+  Virtual COM Port
+  ----------------
+  Yet another option is to use UART0 and the virtual COM port.  This
+  option may be more convenient for long term development, but was
+  painful to use during board bring-up.
+
+  The SAM4S Xplained contains an Embedded Debugger (EDBG) that can be
+  used to program and debug the ATSAM4S16C using Serial Wire Debug (SWD).
+  The Embedded debugger also include a Virtual Com port interface over
+  USART1.  Virtual COM port connections:
+
+  AT91SAM4S16     ATSAM3U4CAU
+  -------------- --------------
+  PA9   RX_UART0  PA9_4S PA12
+  PA10  TX_UART0  RX_3U  PA11
+
+SAM4S Xplained-specific Configuration Options
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+  CONFIG_ARCH - Identifies the arch/ subdirectory.  This should
+  be set to:
+
+    CONFIG_ARCH=arm
+
+  CONFIG_ARCH_family - For use in C code:
+
+    CONFIG_ARCH_ARM=y
+
+  CONFIG_ARCH_architecture - For use in C code:
+
+    CONFIG_ARCH_CORTEXM4=y
+
+  CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory
+
+    CONFIG_ARCH_CHIP="sam34"
+
+  CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
+  chip:
+
+    CONFIG_ARCH_CHIP_SAM34
+    CONFIG_ARCH_CHIP_SAM4S
+    CONFIG_ARCH_CHIP_ATSAM4D32C
+
+  CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
+  hence, the board that supports the particular chip or SoC.
+
+    CONFIG_ARCH_BOARD=sam4s-xplained-pro (for the SAM4S Xplained Pro development board)
+
+  CONFIG_ARCH_BOARD_name - For use in C code
+
+    CONFIG_ARCH_BOARD_SAM4S_XPLAINED_PRO=y
+
+  CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
+  of delay loops
+
+  CONFIG_ENDIAN_BIG - define if big endian (default is little
+  endian)
+
+  CONFIG_RAM_SIZE - Describes the installed DRAM (SRAM in this case):
+
+    CONFIG_RAM_SIZE=0x00008000 (32Kb)
+
+  CONFIG_RAM_START - The start address of installed DRAM
+
+    CONFIG_RAM_START=0x20000000
+
+  CONFIG_ARCH_IRQPRIO - The SAM4S supports interrupt prioritization
+
+    CONFIG_ARCH_IRQPRIO=y
+
+  CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
+  have LEDs
+
+  CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
+  stack. If defined, this symbol is the size of the interrupt
+  stack in bytes.  If not defined, the user task stacks will be
+  used during interrupt handling.
+
+  CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions
+
+  CONFIG_ARCH_LEDS -  Use LEDs to show state. Unique to board architecture.
+
+  CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that
+  cause a 100 second delay during boot-up.  This 100 second delay
+  serves no purpose other than it allows you to calibratre
+  CONFIG_ARCH_LOOPSPERMSEC.  You simply use a stop watch to measure
+  the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until
+  the delay actually is 100 seconds.
+
+  Individual subsystems can be enabled:
+
+    CONFIG_SAM34_RTC         - Real Time Clock
+    CONFIG_SAM34_RTT         - Real Time Timer
+    CONFIG_SAM34_WDT         - Watchdog Timer
+    CONFIG_SAM34_UART0       - UART 0
+    CONFIG_SAM34_UART1       - UART 1
+    CONFIG_SAM34_SMC         - Static Memory Controller
+    CONFIG_SAM34_USART0      - USART 0
+    CONFIG_SAM34_USART1      - USART 1
+    CONFIG_SAM34_HSMCI       - High Speed Multimedia Card Interface
+    CONFIG_SAM34_TWI0        - Two-Wire Interface 0
+    CONFIG_SAM34_TWI1        - Two-Wire Interface 1
+    CONFIG_SAM34_SPI0        - Serial Peripheral Interface
+    CONFIG_SAM34_SSC         - Synchronous Serial Controller
+    CONFIG_SAM34_TC0         - Timer Counter 0
+    CONFIG_SAM34_TC1         - Timer Counter 1
+    CONFIG_SAM34_TC2         - Timer Counter 2
+    CONFIG_SAM34_TC3         - Timer Counter 3
+    CONFIG_SAM34_TC4         - Timer Counter 4
+    CONFIG_SAM34_TC5         - Timer Counter 5
+    CONFIG_SAM34_ADC12B      - 12-bit Analog To Digital Converter
+    CONFIG_SAM34_DACC        - Digital To Analog Converter
+    CONFIG_SAM34_PWM         - Pulse Width Modulation
+    CONFIG_SAM34_CRCCU       - CRC Calculation Unit
+    CONFIG_SAM34_ACC         - Analog Comparator
+    CONFIG_SAM34_UDP         - USB Device Port
+
+  Some subsystems can be configured to operate in different ways. The drivers
+  need to know how to configure the subsystem.
+
+    CONFIG_GPIOA_IRQ
+    CONFIG_GPIOB_IRQ
+    CONFIG_GPIOC_IRQ
+    CONFIG_USART0_ISUART
+    CONFIG_USART1_ISUART
+    CONFIG_USART2_ISUART
+    CONFIG_USART3_ISUART
+
+  ST91SAM4S specific device driver settings
+
+    CONFIG_U[S]ARTn_SERIAL_CONSOLE - selects the USARTn (n=0,1,2,3) or UART
+           m (m=4,5) for the console and ttys0 (default is the USART1).
+    CONFIG_U[S]ARTn_RXBUFSIZE - Characters are buffered as received.
+       This specific the size of the receive buffer
+    CONFIG_U[S]ARTn_TXBUFSIZE - Characters are buffered before
+       being sent.  This specific the size of the transmit buffer
+    CONFIG_U[S]ARTn_BAUD - The configure BAUD of the UART.  Must be
+    CONFIG_U[S]ARTn_BITS - The number of bits.  Must be either 7 or 8.
+    CONFIG_U[S]ARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
+    CONFIG_U[S]ARTn_2STOP - Two stop bits
+
+Configurations
+^^^^^^^^^^^^^^
+
+  Each SAM4S Xplained configuration is maintained in a sub-directory and
+  can be selected as follow:
+
+    cd tools
+    ./configure.shsam4s-xplained-pro/<subdir>
+    cd -
+    . ./setenv.sh
+
+  Before sourcing the setenv.sh file above, you should examine it and perform
+  edits as necessary so that BUILDROOT_BIN is the correct path to the directory
+  than holds your toolchain binaries.
+
+  And then build NuttX by simply typing the following.  At the conclusion of
+  the make, the nuttx binary will reside in an ELF file called, simply, nuttx.
+
+    make
+
+  The <subdir> that is provided above as an argument to the tools/configure.sh
+  must be is one of the following.
+
+  NOTES:
+
+  1. These configurations use the mconf-based configuration tool.  To
+    change any of these configurations using that tool, you should:
+
+    a. Build and install the kconfig-mconf tool.  See nuttx/README.txt
+       and misc/tools/
+
+    b. Execute 'make menuconfig' in nuttx/ in order to start the
+       reconfiguration process.
+
+  2. Unless stated otherwise, all configurations generate console
+     output on UART1 which is available on J1 or J4 (see the
+     section "Serial Consoles" above).  USART1 or the virtual COM
+     port on UART0 are options. The virtual COM port could
+     be used, for example, by reconfiguring to use UART0 like:
+
+       System Type -> AT91SAM3/4 Peripheral Support
+         CONFIG_SAM_UART0=y
+         CONFIG_SAM_UART1=n
+
+       Device Drivers -> Serial Driver Support -> Serial Console
+         CONFIG_UART0_SERIAL_CONSOLE=y
+
+       Device Drivers -> Serial Driver Support -> UART0 Configuration
+         CONFIG_UART0_2STOP=0
+         CONFIG_UART0_BAUD=115200
+         CONFIG_UART0_BITS=8
+         CONFIG_UART0_PARITY=0
+         CONFIG_UART0_RXBUFSIZE=256
+         CONFIG_UART0_TXBUFSIZE=256
+
+  3. Unless otherwise stated, the configurations are setup for
+     Linux (or any other POSIX environment like Cygwin under Windows):
+
+     Build Setup:
+       CONFIG_HOST_LINUX=y   : Linux or other POSIX environment
+
+  4. These configurations use the older, OABI, buildroot toolchain.  But
+     that is easily reconfigured:
+
+     System Type -> Toolchain:
+       CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y : Buildroot toolchain
+       CONFIG_ARMV7M_OABI_TOOLCHAIN=y      : Older, OABI toolchain
+
+     If you want to use the Atmel GCC toolchain, here are the steps to
+     do so:
+
+     Build Setup:
+       CONFIG_HOST_WINDOWS=y   : Windows
+       CONFIG_HOST_CYGWIN=y    : Using Cygwin or other POSIX environment
+
+     System Type -> Toolchain:
+       CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIW=y : General GCC EABI toolchain under windows
+
+     This re-configuration should be done before making NuttX or else the
+     subsequent 'make' will fail.  If you have already attempted building
+     NuttX then you will have to 1) 'make distclean' to remove the old
+     configuration, 2) 'cd tools; ./configure.sh sam3u-ek/ksnh' to start
+     with a fresh configuration, and 3) perform the configuration changes
+     above.
+
+     Also, make sure that your PATH variable has the new path to your
+     Atmel tools.  Try 'which arm-none-eabi-gcc' to make sure that you
+     are selecting the right tool.  setenv.sh is available for you to
+     use to set or PATH variable.  The path in the that file may not,
+     however, be correct for your installation.
+
+     See also the "NOTE about Windows native toolchains" in the section call
+     "GNU Toolchain Options" above.
+
+Configuration sub-directories
+-----------------------------
+
+  nsh:
+    This configuration directory will built the NuttShell.  See NOTES above.
+
+    NOTES:
+    1. The configuration configuration can be modified to include support
+       for the on-board SRAM (1MB).
+
+       System Type -> External Memory Configuration       
+         CONFIG_SAM34_EXTSRAM0=y              : Select SRAM on CS0
+         CONFIG_SAM34_EXTSRAM0SIZE=1048576    : Size=1MB
+
+       Now what are you going to do with the SRAM.  There are two choices:
+
+       a)  To enable the NuttX RAM test that may be used to verify the
+           external SRAM:
+
+           System Type -> External Memory Configuration       
+             CONFIG_SAM34_EXTSRAM0HEAP=n      : Don't add to heap
+
+           Application Configuration -> System NSH Add-Ons
+             CONFIG_SYSTEM_RAMTEST=y         : Enable the RAM test built-in
+
+         In this configuration, the SDRAM is not added to heap and so is
+         not excessible to the applications.  So the RAM test can be
+         freely executed against the SRAM memory beginning at address
+         0x6000:0000 (CS0).
+
+         nsh> ramtest -h
+         Usage: <noname> [-w|h|b] <hex-address> <decimal-size>
+
+         Where:
+           <hex-address> starting address of the test.
+           <decimal-size> number of memory locations (in bytes).
+           -w Sets the width of a memory location to 32-bits.
+           -h Sets the width of a memory location to 16-bits (default).
+           -b Sets the width of a memory location to 8-bits.
+
+         To test the entire external SRAM:
+
+         nsh> ramtest 60000000 1048576
+         RAMTest: Marching ones: 60000000 1048576
+         RAMTest: Marching zeroes: 60000000 1048576
+         RAMTest: Pattern test: 60000000 1048576 55555555 aaaaaaaa
+         RAMTest: Pattern test: 60000000 1048576 66666666 99999999
+         RAMTest: Pattern test: 60000000 1048576 33333333 cccccccc
+         RAMTest: Address-in-address test: 60000000 1048576
+
+        b) To add this RAM to the NuttX heap, you would need to change the
+           configuration as follows:
+
+           System Type -> External Memory Configuration       
+             CONFIG_SAM34_EXTSRAM0HEAP=y     : Add external RAM to heap
+
+           Memory Management
+             -CONFIG_MM_REGIONS=1           : Only the internal SRAM
+             +CONFIG_MM_REGIONS=2           : Also include external SRAM
diff --git a/nuttx/configs/sam4s-xplained-pro/include/board.h b/nuttx/configs/sam4s-xplained-pro/include/board.h
new file mode 100644
index 000000000..dda3271d0
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/include/board.h
@@ -0,0 +1,260 @@
+/************************************************************************************
+ * configs/sam4s-xplained-pro/include/board.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __CONFIGS_SAM4S_XPLAINED_PRO_INCLUDE_BOARD_H
+#define __CONFIGS_SAM4S_XPLAINED_PRO_INCLUDE_BOARD_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifndef __ASSEMBLY__
+#  include <stdint.h>
+#  ifdef CONFIG_GPIO_IRQ
+#    include <arch/irq.h>
+#  endif
+#endif
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+/* Clocking *************************************************************************/
+/* After power-on reset, the sam3u device is running on a 4MHz internal RC.  These
+ * definitions will configure clocking with MCK = 48MHz, PLLA = 96, and CPU=120MHz.
+ */
+
+/* Main oscillator register settings */
+
+#define BOARD_CKGR_MOR_MOSCXTST    (63 << PMC_CKGR_MOR_MOSCXTST_SHIFT) /* Start-up Time */
+
+/* PLLA configuration:
+ *
+ * Source: 12MHz crystall at 12MHz
+ * PLLmul: 10
+ * PLLdiv: 1 (bypassed)
+ * Fpll:   (12MHz * 10) / 1 = 120MHz
+ */
+
+#define BOARD_MAINOSC_FREQUENCY    (12000000)
+#define BOARD_CKGR_PLLAR_MUL       (9 << PMC_CKGR_PLLAR_MUL_SHIFT)
+#define BOARD_CKGR_PLLAR_DIV       PMC_CKGR_PLLAR_DIV_BYPASS
+#define BOARD_CKGR_PLLAR_COUNT     (63 << PMC_CKGR_PLLAR_COUNT_SHIFT)
+#define BOARD_PLLA_FREQUENCY       (10*BOARD_MAINOSC_FREQUENCY)   /* PLLA = 120Mhz */
+
+/* PMC master clock register settings */
+
+#define BOARD_PMC_MCKR_CSS         PMC_MCKR_CSS_PLLA
+#define BOARD_PMC_MCKR_PRES        PMC_MCKR_PRES_DIV1
+#define BOARD_MCK_FREQUENCY        (BOARD_PLLA_FREQUENCY/1)       /* MCK = 120Mhz */
+#define BOARD_CPU_FREQUENCY        (BOARD_PLLA_FREQUENCY/1)       /* CPU = 120Mhz */
+
+/* USB UTMI PLL start-up time */
+
+#define BOARD_CKGR_UCKR_UPLLCOUNT  (3 << PMC_CKGR_UCKR_UPLLCOUNT_SHIFT)
+
+/* HSMCI clocking
+ *
+ * Multimedia Card Interface clock (MCCK or MCI_CK) is Master Clock (MCK)
+ * divided by (2*(CLKDIV+1)).
+ *
+ *   MCI_SPEED = MCK / (2*(CLKDIV+1))
+ *   CLKDIV = MCI / MCI_SPEED / 2 - 1
+ */
+
+/* MCK = 120MHz, CLKDIV = 149, MCI_SPEED = 120MHz / 2 * (149+1) = 400 KHz */
+
+#define HSMCI_INIT_CLKDIV          (149 << HSMCI_MR_CLKDIV_SHIFT) /* 120M MCK */
+
+/* MCK = 120MHz, CLKDIV = 4, MCI_SPEED = 120MHz / 2 * (4+1) = 12 MHz */
+
+#define HSMCI_MMCXFR_CLKDIV        (4 << HSMCI_MR_CLKDIV_SHIFT)
+
+/* MCK = 120MHz, CLKDIV = 0, MCI_SPEED = 120MHz / 2 * (2+1) = 20 MHz */
+
+#define HSMCI_SDXFR_CLKDIV         (2 << HSMCI_MR_CLKDIV_SHIFT) /* 120M MCK, 20M SDCLK */
+#define HSMCI_SDWIDEXFR_CLKDIV     HSMCI_SDXFR_CLKDIV           /* 120M MCK, 20M SDCLK */
+
+/* FLASH wait states:
+ *
+ * DC Characteristics
+ *
+ * Parameter              Min   Typ  Max
+ * ---------------------- ----- ----- ----
+ * Vddcore DC Supply Core 1.08V 1.2V 1.32V
+ * Vvddio  DC Supply I/Os 1.62V 3.3V 3.6V
+ *
+ *                     Wait   Maximum
+ * Vddcore   Vvddio   States Frequency (MHz)
+ * ------- ---------- ------ ---------------
+ * 1.08V   1.62-3.6V    0        16
+ * "   "   "  "-"  "    1        33
+ * "   "   "  "-"  "    2        50
+ * "   "   "  "-"  "    3        67
+ * "   "   "  "-"  "    4        84
+ * "   "   "  "-"  "    5       100
+ * 1.08V   2.7-3.6V     0        20
+ * "   "   " "-"  "     1        40
+ * "   "   " "-"  "     2        60
+ * "   "   " "-"  "     3        80
+ * "   "   " "-"  "     4       100
+ * 1.2V    1.62-3.6V    0        17
+ * "  "    " "-"  "     1        34
+ * "  "    " "-"  "     2        52
+ * "  "    " "-"  "     3        69
+ * "  "    " "-"  "     4        87
+ * "  "    " "-"  "     5       104
+ * "  "    " "-"  "     6       121
+ * 1.2V    2.7-3.6V     0        21
+ * "  "    " "-"  "     1        42
+ * "  "    " "-"  "     2        63
+ * "  "    " "-"  "     3        84
+ * "  "    " "-"  "     4       105
+ * "  "    " "-"  "     5       123 << SELECTION
+ */
+
+#define BOARD_FWS                  5
+
+/* LED definitions ******************************************************************/
+/* There are two LEDs on board the SAM4S Xplained Pro board, One of these can be
+ * controlled by software in the SAM4S:
+ *
+ *   LED              GPIO
+ *   ---------------- -----
+ *   D301 Yellow LED   PC10
+ *
+ * Both can be illuminated by driving the GPIO output to ground (low).
+ */
+
+/* LED index values for use with sam_setled() */
+
+#define BOARD_D301           0
+#define BOARD_NLEDS          1
+
+/* LED bits for use with sam_setleds() */
+
+#define BOARD_D301_BIT       (1 << BOARD_D301)
+
+/* These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
+ * defined.  In that case, the usage by the board port is defined in
+ * include/board.h and src/up_leds.c. The LEDs are used to encode OS-related
+ * events as follows:
+ *
+ *   SYMBOL                Val  Meaning                      LED state
+ *                                                          D301
+ * ----------------------- ---  -----------------------  --------------     */
+#define LED_STARTED          0 /* NuttX has been started    OFF             */
+#define LED_HEAPALLOCATE     0 /* Heap has been allocated   OFF             */
+#define LED_IRQSENABLED      0 /* Interrupts enabled        OFF             */
+#define LED_STACKCREATED     0 /* Idle stack created        ON              */
+#define LED_INIRQ            0 /* In an interrupt           No change       */
+#define LED_SIGNAL           0 /* In a signal handler       No change       */
+#define LED_ASSERTION        0 /* An assertion failed       No change       */
+#define LED_PANIC            0 /* The system has crashed    OFF             */
+#define LED_IDLE             0 /* MCU is is sleep mode      Not used        */
+
+/* Thus if D301 is statically on, NuttX has successfully booted and is,
+ * apparently, running normmally.  
+ */
+
+/* Button definitions ***************************************************************/
+/* Mechanical buttons:
+ *
+ * The SAM4S Xplained Pro has two mechanical buttons. One button is the RESET button
+ * connected to the SAM4S reset line and the other is a generic user configurable
+ * button labeled SW0. When a button is pressed it will drive the I/O line to GND.
+ *
+ *   PA2 SW0
+ */
+
+#define BUTTON_SW0           0
+#define NUM_BUTTONS          1
+
+#define BUTTON_SW0_BIT       (1 << BUTTON_SW0)
+
+/************************************************************************************
+ * Public Data
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/************************************************************************************
+ * Public Function Prototypes
+ ************************************************************************************/
+/************************************************************************************
+ * Name: sam_boardinitialize
+ *
+ * Description:
+ *   All SAM3U architectures must provide the following entry point.  This entry point
+ *   is called early in the intitialization -- after all memory has been configured
+ *   and mapped but before any devices have been initialized.
+ *
+ ************************************************************************************/
+
+void sam_boardinitialize(void);
+
+/************************************************************************************
+ * Name:  sam_ledinit, sam_setled, and sam_setleds
+ *
+ * Description:
+ *   If CONFIG_ARCH_LEDS is defined, then NuttX will control the on-board LEDs.  If
+ *   CONFIG_ARCH_LEDS is not defined, then the following interfaces are available to
+ *   control the LEDs from user applications.
+ *
+ ************************************************************************************/
+
+#ifndef CONFIG_ARCH_LEDS
+void sam_ledinit(void);
+void sam_setled(int led, bool ledon);
+void sam_setleds(uint8_t ledset);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif  /* __CONFIGS_SAM4S_XPLAINED_PRO_INCLUDE_BOARD_H */
diff --git a/nuttx/configs/sam4s-xplained-pro/nsh/Make.defs b/nuttx/configs/sam4s-xplained-pro/nsh/Make.defs
new file mode 100644
index 000000000..4569f853c
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/nsh/Make.defs
@@ -0,0 +1,110 @@
+############################################################################
+# configs/sam4s-xplained-pro/nsh/Make.defs
+#
+#   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+include ${TOPDIR}/.config
+include ${TOPDIR}/tools/Config.mk
+include ${TOPDIR}/arch/arm/src/armv7-m/Toolchain.defs
+
+ifeq ($(WINTOOL),y)
+  # Windows-native toolchains
+  DIRLINK = $(TOPDIR)/tools/copydir.sh
+  DIRUNLINK = $(TOPDIR)/tools/unlink.sh
+  MKDEP = $(TOPDIR)/tools/mknulldeps.sh
+  ARCHINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)/include}"
+  ARCHXXINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)/include}" -isystem "${shell cygpath -w $(TOPDIR)/include/cxx}"
+  ARCHSCRIPT = -T "${shell cygpath -w $(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/ld.script}"
+else
+  # Linux/Cygwin-native toolchain 
+  MKDEP = $(TOPDIR)/tools/mkdeps.sh
+  ARCHINCLUDES = -I. -isystem $(TOPDIR)/include
+  ARCHXXINCLUDES = -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
+  ARCHSCRIPT = -T$(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/ld.script
+endif
+
+CC = $(CROSSDEV)gcc
+CXX = $(CROSSDEV)g++
+CPP = $(CROSSDEV)gcc -E
+LD = $(CROSSDEV)ld
+AR = $(CROSSDEV)ar rcs
+NM = $(CROSSDEV)nm
+OBJCOPY = $(CROSSDEV)objcopy
+OBJDUMP = $(CROSSDEV)objdump
+
+ARCHCCVERSION = ${shell $(CC) -v 2>&1 | sed -n '/^gcc version/p' | sed -e 's/^gcc version \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g' -e '1q'}
+ARCHCCMAJOR = ${shell echo $(ARCHCCVERSION) | cut -d'.' -f1}
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  ARCHOPTIMIZATION = -g
+endif
+
+ifneq ($(CONFIG_DEBUG_NOOPT),y)
+  ARCHOPTIMIZATION += $(MAXOPTIMIZATION) -fno-strict-aliasing -fno-strength-reduce -fomit-frame-pointer
+endif
+
+ARCHCFLAGS = -fno-builtin
+ARCHCXXFLAGS = -fno-builtin -fno-exceptions
+ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow
+ARCHWARNINGSXX = -Wall -Wshadow
+ARCHDEFINES =
+ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
+
+CFLAGS = $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
+CXXFLAGS = $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
+CPPFLAGS = $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
+AFLAGS = $(CFLAGS) -D__ASSEMBLY__
+
+NXFLATLDFLAGS1 = -r -d -warn-common
+NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
+LDNXFLATFLAGS = -e main -s 2048
+
+OBJEXT = .o
+LIBEXT = .a
+EXEEXT =
+
+ifneq ($(CROSSDEV),arm-nuttx-elf-)
+  LDFLAGS += -nostartfiles -nodefaultlibs
+endif
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  LDFLAGS += -g
+endif
+
+
+HOSTCC = gcc
+HOSTINCLUDES = -I.
+HOSTCFLAGS = -Wall -Wstrict-prototypes -Wshadow -g -pipe
+HOSTLDFLAGS =
+
diff --git a/nuttx/configs/sam4s-xplained-pro/nsh/defconfig b/nuttx/configs/sam4s-xplained-pro/nsh/defconfig
new file mode 100644
index 000000000..a3f340a42
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/nsh/defconfig
@@ -0,0 +1,904 @@
+#
+# Automatically generated file; DO NOT EDIT.
+# Nuttx/ Configuration
+#
+
+#
+# Build Setup
+#
+# CONFIG_EXPERIMENTAL is not set
+# CONFIG_DEFAULT_SMALL is not set
+CONFIG_HOST_LINUX=y
+# CONFIG_HOST_OSX is not set
+# CONFIG_HOST_WINDOWS is not set
+# CONFIG_HOST_OTHER is not set
+
+#
+# Build Configuration
+#
+CONFIG_APPS_DIR="../apps"
+# CONFIG_BUILD_2PASS is not set
+
+#
+# Binary Output Formats
+#
+# CONFIG_RRLOAD_BINARY is not set
+CONFIG_INTELHEX_BINARY=y
+# CONFIG_MOTOROLA_SREC is not set
+CONFIG_RAW_BINARY=y
+
+#
+# Customize Header Files
+#
+# CONFIG_ARCH_STDINT_H is not set
+# CONFIG_ARCH_STDBOOL_H is not set
+# CONFIG_ARCH_MATH_H is not set
+# CONFIG_ARCH_FLOAT_H is not set
+# CONFIG_ARCH_STDARG_H is not set
+
+#
+# Debug Options
+#
+CONFIG_DEBUG=y
+CONFIG_ARCH_HAVE_STACKCHECK=y
+# CONFIG_ARCH_HAVE_HEAPCHECK is not set
+# CONFIG_DEBUG_VERBOSE is not set
+
+#
+# Subsystem Debug Options
+#
+# CONFIG_DEBUG_MM is not set
+# CONFIG_DEBUG_SCHED is not set
+CONFIG_DEBUG_FS=y
+# CONFIG_DEBUG_LIB is not set
+# CONFIG_DEBUG_BINFMT is not set
+# CONFIG_DEBUG_GRAPHICS is not set
+# CONFIG_DEBUG_IRQ is not set
+# CONFIG_DEBUG_STACK is not set
+
+#
+# Driver Debug Options
+#
+# CONFIG_DEBUG_LEDS is not set
+# CONFIG_DEBUG_ANALOG is not set
+# CONFIG_DEBUG_SDIO is not set
+# CONFIG_DEBUG_GPIO is not set
+# CONFIG_DEBUG_DMA is not set
+# CONFIG_DEBUG_RTC is not set
+# CONFIG_DEBUG_AUDIO is not set
+CONFIG_DEBUG_SYMBOLS=y
+CONFIG_ARCH_HAVE_CUSTOMOPT=y
+# CONFIG_DEBUG_NOOPT is not set
+# CONFIG_DEBUG_CUSTOMOPT is not set
+CONFIG_DEBUG_FULLOPT=y
+
+#
+# System Type
+#
+# CONFIG_ARCH_8051 is not set
+CONFIG_ARCH_ARM=y
+# CONFIG_ARCH_AVR is not set
+# CONFIG_ARCH_HC is not set
+# CONFIG_ARCH_MIPS is not set
+# CONFIG_ARCH_RGMP is not set
+# CONFIG_ARCH_SH is not set
+# CONFIG_ARCH_SIM is not set
+# CONFIG_ARCH_X86 is not set
+# CONFIG_ARCH_Z16 is not set
+# CONFIG_ARCH_Z80 is not set
+CONFIG_ARCH="arm"
+
+#
+# ARM Options
+#
+# CONFIG_ARCH_CHIP_A1X is not set
+# CONFIG_ARCH_CHIP_C5471 is not set
+# CONFIG_ARCH_CHIP_CALYPSO is not set
+# CONFIG_ARCH_CHIP_DM320 is not set
+# CONFIG_ARCH_CHIP_IMX is not set
+# CONFIG_ARCH_CHIP_KINETIS is not set
+# CONFIG_ARCH_CHIP_KL is not set
+# CONFIG_ARCH_CHIP_LM is not set
+# CONFIG_ARCH_CHIP_TIVA is not set
+# CONFIG_ARCH_CHIP_LPC17XX is not set
+# CONFIG_ARCH_CHIP_LPC214X is not set
+# CONFIG_ARCH_CHIP_LPC2378 is not set
+# CONFIG_ARCH_CHIP_LPC31XX is not set
+# CONFIG_ARCH_CHIP_LPC43XX is not set
+# CONFIG_ARCH_CHIP_NUC1XX is not set
+# CONFIG_ARCH_CHIP_SAMA5 is not set
+# CONFIG_ARCH_CHIP_SAMD is not set
+CONFIG_ARCH_CHIP_SAM34=y
+# CONFIG_ARCH_CHIP_STM32 is not set
+# CONFIG_ARCH_CHIP_STR71X is not set
+# CONFIG_ARCH_ARM7TDMI is not set
+# CONFIG_ARCH_ARM926EJS is not set
+# CONFIG_ARCH_ARM920T is not set
+# CONFIG_ARCH_CORTEXM0 is not set
+# CONFIG_ARCH_CORTEXM3 is not set
+CONFIG_ARCH_CORTEXM4=y
+# CONFIG_ARCH_CORTEXA5 is not set
+# CONFIG_ARCH_CORTEXA8 is not set
+CONFIG_ARCH_FAMILY="armv7-m"
+CONFIG_ARCH_CHIP="sam34"
+# CONFIG_ARMV7M_USEBASEPRI is not set
+# CONFIG_ARCH_HAVE_FPU is not set
+CONFIG_ARCH_HAVE_MPU=y
+# CONFIG_ARMV7M_MPU is not set
+# CONFIG_DEBUG_HARDFAULT is not set
+
+#
+# ARMV7M Configuration Options
+#
+CONFIG_ARMV7M_TOOLCHAIN_BUILDROOT=y
+# CONFIG_ARMV7M_TOOLCHAIN_CODEREDL is not set
+# CONFIG_ARMV7M_TOOLCHAIN_CODESOURCERYL is not set
+# CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIL is not set
+# CONFIG_ARMV7M_OABI_TOOLCHAIN is not set
+CONFIG_GPIO_IRQ=y
+CONFIG_ARCH_HAVE_EXTNAND=y
+CONFIG_ARCH_HAVE_EXTNOR=y
+CONFIG_ARCH_HAVE_EXTSRAM0=y
+CONFIG_SDIO_DMA=y
+# CONFIG_SDIO_WIDTH_D1_ONLY is not set
+CONFIG_ARCH_HAVE_EXTSRAM1=y
+
+#
+# AT91SAM3/4 Configuration Options
+#
+# CONFIG_ARCH_CHIP_ATSAM3U4E is not set
+# CONFIG_ARCH_CHIP_ATSAM3U4C is not set
+# CONFIG_ARCH_CHIP_ATSAM3U2E is not set
+# CONFIG_ARCH_CHIP_ATSAM3U2C is not set
+# CONFIG_ARCH_CHIP_ATSAM3U1E is not set
+# CONFIG_ARCH_CHIP_ATSAM3U1C is not set
+# CONFIG_ARCH_CHIP_ATSAM3X8E is not set
+# CONFIG_ARCH_CHIP_ATSAM3X8C is not set
+# CONFIG_ARCH_CHIP_ATSAM3X4E is not set
+# CONFIG_ARCH_CHIP_ATSAM3X4C is not set
+# CONFIG_ARCH_CHIP_ATSAM3A8C is not set
+# CONFIG_ARCH_CHIP_ATSAM3A4C is not set
+# CONFIG_ARCH_CHIP_ATSAM4LC2C is not set
+# CONFIG_ARCH_CHIP_ATSAM4LC2B is not set
+# CONFIG_ARCH_CHIP_ATSAM4LC2A is not set
+# CONFIG_ARCH_CHIP_ATSAM4LC4C is not set
+# CONFIG_ARCH_CHIP_ATSAM4LC4B is not set
+# CONFIG_ARCH_CHIP_ATSAM4LC4A is not set
+# CONFIG_ARCH_CHIP_ATSAM4LS2C is not set
+# CONFIG_ARCH_CHIP_ATSAM4LS2B is not set
+# CONFIG_ARCH_CHIP_ATSAM4LS2A is not set
+# CONFIG_ARCH_CHIP_ATSAM4LS4C is not set
+# CONFIG_ARCH_CHIP_ATSAM4LS4B is not set
+# CONFIG_ARCH_CHIP_ATSAM4LS4A is not set
+CONFIG_ARCH_CHIP_ATSAM4SD32C=y
+# CONFIG_ARCH_CHIP_ATSAM4SD32B is not set
+# CONFIG_ARCH_CHIP_ATSAM4SD16C is not set
+# CONFIG_ARCH_CHIP_ATSAM4SD16B is not set
+# CONFIG_ARCH_CHIP_ATSAM4SA16C is not set
+# CONFIG_ARCH_CHIP_ATSAM4SA16B is not set
+# CONFIG_ARCH_CHIP_ATSAM4S16C is not set
+# CONFIG_ARCH_CHIP_ATSAM4S16B is not set
+# CONFIG_ARCH_CHIP_ATSAM4S8C is not set
+# CONFIG_ARCH_CHIP_ATSAM4S8B is not set
+# CONFIG_ARCH_CHIP_ATSAM4E16E is not set
+# CONFIG_ARCH_CHIP_ATSAM4E16C is not set
+# CONFIG_ARCH_CHIP_ATSAM4E8E is not set
+# CONFIG_ARCH_CHIP_ATSAM4E8C is not set
+# CONFIG_ARCH_CHIP_SAM3U is not set
+# CONFIG_ARCH_CHIP_SAM3X is not set
+# CONFIG_ARCH_CHIP_SAM3A is not set
+# CONFIG_ARCH_CHIP_SAM4L is not set
+# CONFIG_ARCH_CHIP_SAM4E is not set
+CONFIG_ARCH_CHIP_SAM4S=y
+
+#
+# AT91SAM3/4 Peripheral Support
+#
+# CONFIG_SAM34_SPI0 is not set
+# CONFIG_SAM34_SSC is not set
+# CONFIG_SAM34_TC0 is not set
+# CONFIG_SAM34_TC1 is not set
+# CONFIG_SAM34_TC2 is not set
+# CONFIG_SAM34_TC3 is not set
+# CONFIG_SAM34_TC4 is not set
+# CONFIG_SAM34_TC5 is not set
+# CONFIG_SAM34_PWM is not set
+# CONFIG_SAM34_TWIM0 is not set
+# CONFIG_SAM34_TWIS0 is not set
+# CONFIG_SAM34_TWIM1 is not set
+# CONFIG_SAM34_TWIS1 is not set
+# CONFIG_SAM34_UART0 is not set
+CONFIG_SAM34_UART1=y
+# CONFIG_SAM34_USART0 is not set
+# CONFIG_SAM34_USART1 is not set
+# CONFIG_SAM34_ADC12B is not set
+# CONFIG_SAM34_DACC is not set
+# CONFIG_SAM34_ACC is not set
+CONFIG_SAM34_SMC=y
+CONFIG_SAM34_PDCA=y
+# CONFIG_SAM34_CRCCU is not set
+# CONFIG_SAM34_UDP is not set
+CONFIG_SAM34_RTC=y
+# CONFIG_SAM34_RTT is not set
+CONFIG_SAM34_WDT=y
+CONFIG_SAM34_HSMCI=y
+
+#
+# External Memory Configuration
+#
+CONFIG_SAM34_EXTNAND=y
+CONFIG_SAM34_EXTNANDSIZE=268435456
+# CONFIG_SAM34_EXTNOR is not set
+# CONFIG_SAM34_EXTSRAM0 is not set
+# CONFIG_SAM34_EXTSRAM1 is not set
+
+#
+# AT91SAM3/4 GPIO Interrupt Configuration
+#
+CONFIG_GPIOA_IRQ=y
+# CONFIG_GPIOB_IRQ is not set
+# CONFIG_GPIOC_IRQ is not set
+
+#
+# AT91SAM3/4 Watchdog Configuration
+#
+# CONFIG_WDT_ENABLED_ON_RESET is not set
+
+#
+# Architecture Options
+#
+# CONFIG_ARCH_NOINTC is not set
+# CONFIG_ARCH_VECNOTIRQ is not set
+CONFIG_ARCH_DMA=y
+CONFIG_ARCH_HAVE_IRQPRIO=y
+# CONFIG_CUSTOM_STACK is not set
+# CONFIG_ADDRENV is not set
+CONFIG_ARCH_HAVE_VFORK=y
+# CONFIG_ARCH_HAVE_MMU is not set
+# CONFIG_ARCH_NAND_HWECC is not set
+CONFIG_ARCH_IRQPRIO=y
+CONFIG_ARCH_STACKDUMP=y
+# CONFIG_ENDIAN_BIG is not set
+# CONFIG_ARCH_IDLE_CUSTOM is not set
+CONFIG_ARCH_HAVE_RAMFUNCS=y
+# CONFIG_ARCH_RAMFUNCS is not set
+CONFIG_ARCH_HAVE_RAMVECTORS=y
+CONFIG_ARCH_RAMVECTORS=y
+
+#
+# Board Settings
+#
+CONFIG_BOARD_LOOPSPERMSEC=9186
+# CONFIG_ARCH_CALIBRATION is not set
+
+#
+# Interrupt options
+#
+CONFIG_ARCH_HAVE_INTERRUPTSTACK=y
+CONFIG_ARCH_INTERRUPTSTACK=0
+CONFIG_ARCH_HAVE_HIPRI_INTERRUPT=y
+# CONFIG_ARCH_HIPRI_INTERRUPT is not set
+
+#
+# Boot options
+#
+# CONFIG_BOOT_RUNFROMEXTSRAM is not set
+CONFIG_BOOT_RUNFROMFLASH=y
+# CONFIG_BOOT_RUNFROMISRAM is not set
+# CONFIG_BOOT_RUNFROMSDRAM is not set
+# CONFIG_BOOT_COPYTORAM is not set
+
+#
+# Boot Memory Configuration
+#
+CONFIG_RAM_START=0x20000000
+CONFIG_RAM_SIZE=163840
+# CONFIG_ARCH_HAVE_SDRAM is not set
+
+#
+# Board Selection
+#
+CONFIG_ARCH_BOARD_SAM4S_XPLAINED_PRO=y
+# CONFIG_ARCH_BOARD_CUSTOM is not set
+CONFIG_ARCH_BOARD="sam4s-xplained-pro"
+
+#
+# Common Board Options
+#
+CONFIG_ARCH_HAVE_LEDS=y
+CONFIG_ARCH_LEDS=y
+CONFIG_ARCH_HAVE_BUTTONS=y
+CONFIG_ARCH_BUTTONS=y
+CONFIG_ARCH_HAVE_IRQBUTTONS=y
+CONFIG_ARCH_IRQBUTTONS=y
+CONFIG_NSH_MMCSDMINOR=0
+CONFIG_NSH_MMCSDSLOTNO=0
+
+#
+# Board-Specific Options
+#
+
+#
+# RTOS Features
+#
+# CONFIG_BOARD_INITIALIZE is not set
+CONFIG_MSEC_PER_TICK=10
+# CONFIG_SYSTEM_TIME64 is not set
+CONFIG_RR_INTERVAL=50
+# CONFIG_SCHED_CPULOAD is not set
+# CONFIG_SCHED_INSTRUMENTATION is not set
+CONFIG_TASK_NAME_SIZE=16
+# CONFIG_SCHED_HAVE_PARENT is not set
+CONFIG_JULIAN_TIME=y
+CONFIG_START_YEAR=2014
+CONFIG_START_MONTH=3
+CONFIG_START_DAY=20
+CONFIG_DEV_CONSOLE=y
+# CONFIG_MUTEX_TYPES is not set
+# CONFIG_PRIORITY_INHERITANCE is not set
+# CONFIG_FDCLONE_DISABLE is not set
+# CONFIG_FDCLONE_STDIO is not set
+CONFIG_SDCLONE_DISABLE=y
+CONFIG_SCHED_WAITPID=y
+# CONFIG_SCHED_STARTHOOK is not set
+# CONFIG_SCHED_ATEXIT is not set
+# CONFIG_SCHED_ONEXIT is not set
+CONFIG_USER_ENTRYPOINT="nsh_main"
+CONFIG_DISABLE_OS_API=y
+# CONFIG_DISABLE_CLOCK is not set
+# CONFIG_DISABLE_POSIX_TIMERS is not set
+# CONFIG_DISABLE_PTHREAD is not set
+# CONFIG_DISABLE_SIGNALS is not set
+# CONFIG_DISABLE_MQUEUE is not set
+CONFIG_DISABLE_ENVIRON=y
+
+#
+# Signal Numbers
+#
+CONFIG_SIG_SIGUSR1=1
+CONFIG_SIG_SIGUSR2=2
+CONFIG_SIG_SIGALARM=3
+CONFIG_SIG_SIGCONDTIMEDOUT=16
+CONFIG_SIG_SIGWORK=17
+
+#
+# Sizes of configurable things (0 disables)
+#
+CONFIG_MAX_TASKS=16
+CONFIG_MAX_TASK_ARGS=4
+CONFIG_NPTHREAD_KEYS=4
+CONFIG_NFILE_DESCRIPTORS=8
+CONFIG_NFILE_STREAMS=8
+CONFIG_NAME_MAX=32
+CONFIG_PREALLOC_MQ_MSGS=8
+CONFIG_MQ_MAXMSGSIZE=32
+CONFIG_MAX_WDOGPARMS=2
+CONFIG_PREALLOC_WDOGS=4
+CONFIG_PREALLOC_TIMERS=4
+
+#
+# Stack and heap information
+#
+CONFIG_IDLETHREAD_STACKSIZE=2048
+CONFIG_USERMAIN_STACKSIZE=4096
+CONFIG_PTHREAD_STACK_MIN=512
+CONFIG_PTHREAD_STACK_DEFAULT=4096
+
+#
+# Device Drivers
+#
+CONFIG_DISABLE_POLL=y
+CONFIG_DEV_NULL=y
+CONFIG_DEV_ZERO=y
+# CONFIG_LOOP is not set
+# CONFIG_RAMDISK is not set
+# CONFIG_CAN is not set
+# CONFIG_ARCH_HAVE_PWM_PULSECOUNT is not set
+# CONFIG_PWM is not set
+# CONFIG_ARCH_HAVE_I2CRESET is not set
+# CONFIG_I2C is not set
+# CONFIG_SPI is not set
+# CONFIG_I2S is not set
+CONFIG_RTC=y
+CONFIG_RTC_DATETIME=y
+CONFIG_RTC_ALARM=y
+# CONFIG_WATCHDOG is not set
+# CONFIG_ANALOG is not set
+# CONFIG_AUDIO_DEVICES is not set
+# CONFIG_VIDEO_DEVICES is not set
+# CONFIG_BCH is not set
+# CONFIG_INPUT is not set
+# CONFIG_LCD is not set
+CONFIG_MMCSD=y
+CONFIG_MMCSD_NSLOTS=1
+# CONFIG_MMCSD_READONLY is not set
+# CONFIG_MMCSD_MULTIBLOCK_DISABLE is not set
+CONFIG_MMCSD_MMCSUPPORT=y
+CONFIG_MMCSD_HAVECARDDETECT=y
+CONFIG_ARCH_HAVE_SDIO=y
+CONFIG_MMCSD_SDIO=y
+# CONFIG_SDIO_PREFLIGHT is not set
+# CONFIG_SDIO_MUXBUS is not set
+CONFIG_SDIO_BLOCKSETUP=y
+# CONFIG_MTD is not set
+# CONFIG_PIPES is not set
+# CONFIG_PM is not set
+# CONFIG_POWER is not set
+# CONFIG_SENSORS is not set
+# CONFIG_SERCOMM_CONSOLE is not set
+CONFIG_SERIAL=y
+# CONFIG_DEV_LOWCONSOLE is not set
+# CONFIG_16550_UART is not set
+# CONFIG_ARCH_HAVE_UART is not set
+# CONFIG_ARCH_HAVE_UART0 is not set
+CONFIG_ARCH_HAVE_UART1=y
+# CONFIG_ARCH_HAVE_UART2 is not set
+# CONFIG_ARCH_HAVE_UART3 is not set
+# CONFIG_ARCH_HAVE_UART4 is not set
+# CONFIG_ARCH_HAVE_UART5 is not set
+# CONFIG_ARCH_HAVE_UART6 is not set
+# CONFIG_ARCH_HAVE_UART7 is not set
+# CONFIG_ARCH_HAVE_UART8 is not set
+# CONFIG_ARCH_HAVE_SCI0 is not set
+# CONFIG_ARCH_HAVE_SCI1 is not set
+# CONFIG_ARCH_HAVE_USART0 is not set
+# CONFIG_ARCH_HAVE_USART1 is not set
+# CONFIG_ARCH_HAVE_USART2 is not set
+# CONFIG_ARCH_HAVE_USART3 is not set
+# CONFIG_ARCH_HAVE_USART4 is not set
+# CONFIG_ARCH_HAVE_USART5 is not set
+# CONFIG_ARCH_HAVE_USART6 is not set
+# CONFIG_ARCH_HAVE_USART7 is not set
+# CONFIG_ARCH_HAVE_USART8 is not set
+
+#
+# USART Configuration
+#
+CONFIG_MCU_SERIAL=y
+CONFIG_STANDARD_SERIAL=y
+# CONFIG_SERIAL_TIOCSERGSTRUCT is not set
+CONFIG_UART1_SERIAL_CONSOLE=y
+# CONFIG_NO_SERIAL_CONSOLE is not set
+
+#
+# UART1 Configuration
+#
+CONFIG_UART1_RXBUFSIZE=256
+CONFIG_UART1_TXBUFSIZE=256
+CONFIG_UART1_BAUD=921600
+CONFIG_UART1_BITS=8
+CONFIG_UART1_PARITY=0
+CONFIG_UART1_2STOP=0
+CONFIG_UART1_IFLOWCONTROL=y
+CONFIG_UART1_OFLOWCONTROL=y
+CONFIG_SERIAL_IFLOWCONTROL=y
+CONFIG_SERIAL_OFLOWCONTROL=y
+# CONFIG_USBDEV is not set
+# CONFIG_USBHOST is not set
+# CONFIG_WIRELESS is not set
+
+#
+# System Logging Device Options
+#
+
+#
+# System Logging
+#
+# CONFIG_RAMLOG is not set
+
+#
+# Networking Support
+#
+# CONFIG_ARCH_HAVE_NET is not set
+# CONFIG_ARCH_HAVE_PHY is not set
+# CONFIG_NET is not set
+
+#
+# File Systems
+#
+
+#
+# File system configuration
+#
+# CONFIG_DISABLE_MOUNTPOINT is not set
+# CONFIG_DISABLE_PSEUDOFS_OPERATIONS is not set
+CONFIG_FS_READABLE=y
+CONFIG_FS_WRITABLE=y
+# CONFIG_FS_RAMMAP is not set
+CONFIG_FS_FAT=y
+# CONFIG_FAT_LCNAMES is not set
+# CONFIG_FAT_LFN is not set
+# CONFIG_FS_FATTIME is not set
+# CONFIG_FAT_DMAMEMORY is not set
+# CONFIG_FS_NXFFS is not set
+# CONFIG_FS_ROMFS is not set
+# CONFIG_FS_SMARTFS is not set
+# CONFIG_FS_BINFS is not set
+CONFIG_FS_PROCFS=y
+
+#
+# Exclude individual procfs entries
+#
+# CONFIG_FS_PROCFS_EXCLUDE_PROCESS is not set
+# CONFIG_FS_PROCFS_EXCLUDE_UPTIME is not set
+# CONFIG_FS_PROCFS_EXCLUDE_MOUNTS is not set
+
+#
+# System Logging
+#
+# CONFIG_SYSLOG_ENABLE is not set
+# CONFIG_SYSLOG is not set
+
+#
+# Graphics Support
+#
+# CONFIG_NX is not set
+
+#
+# Memory Management
+#
+# CONFIG_MM_MULTIHEAP is not set
+# CONFIG_MM_SMALL is not set
+CONFIG_MM_REGIONS=1
+# CONFIG_ARCH_HAVE_HEAP2 is not set
+# CONFIG_GRAN is not set
+
+#
+# Audio Support
+#
+# CONFIG_AUDIO is not set
+
+#
+# Binary Formats
+#
+# CONFIG_BINFMT_DISABLE is not set
+# CONFIG_NXFLAT is not set
+# CONFIG_ELF is not set
+CONFIG_BUILTIN=y
+# CONFIG_PIC is not set
+# CONFIG_SYMTAB_ORDEREDBYNAME is not set
+
+#
+# Library Routines
+#
+
+#
+# Standard C Library Options
+#
+CONFIG_STDIO_BUFFER_SIZE=64
+CONFIG_STDIO_LINEBUFFER=y
+CONFIG_NUNGET_CHARS=2
+# CONFIG_LIBM is not set
+# CONFIG_NOPRINTF_FIELDWIDTH is not set
+# CONFIG_LIBC_FLOATINGPOINT is not set
+CONFIG_LIB_RAND_ORDER=1
+# CONFIG_EOL_IS_CR is not set
+# CONFIG_EOL_IS_LF is not set
+# CONFIG_EOL_IS_BOTH_CRLF is not set
+CONFIG_EOL_IS_EITHER_CRLF=y
+# CONFIG_LIBC_EXECFUNCS is not set
+CONFIG_POSIX_SPAWN_PROXY_STACKSIZE=1024
+CONFIG_TASK_SPAWN_DEFAULT_STACKSIZE=2048
+CONFIG_LIBC_STRERROR=y
+CONFIG_LIBC_STRERROR_SHORT=y
+# CONFIG_LIBC_PERROR_STDOUT is not set
+CONFIG_ARCH_LOWPUTC=y
+CONFIG_LIB_SENDFILE_BUFSIZE=512
+# CONFIG_ARCH_ROMGETC is not set
+# CONFIG_ARCH_OPTIMIZED_FUNCTIONS is not set
+
+#
+# Non-standard Library Support
+#
+CONFIG_SCHED_WORKQUEUE=y
+CONFIG_SCHED_HPWORK=y
+CONFIG_SCHED_WORKPRIORITY=192
+CONFIG_SCHED_WORKPERIOD=50000
+CONFIG_SCHED_WORKSTACKSIZE=2048
+CONFIG_SCHED_LPWORK=y
+CONFIG_SCHED_LPWORKPRIORITY=50
+CONFIG_SCHED_LPWORKPERIOD=50000
+CONFIG_SCHED_LPWORKSTACKSIZE=2048
+# CONFIG_LIB_KBDCODEC is not set
+# CONFIG_LIB_SLCDCODEC is not set
+
+#
+# Basic CXX Support
+#
+# CONFIG_C99_BOOL8 is not set
+CONFIG_HAVE_CXX=y
+CONFIG_HAVE_CXXINITIALIZE=y
+# CONFIG_CXX_NEWLONG is not set
+
+#
+# uClibc++ Standard C++ Library
+#
+# CONFIG_UCLIBCXX is not set
+
+#
+# Application Configuration
+#
+
+#
+# Built-In Applications
+#
+CONFIG_BUILTIN_PROXY_STACKSIZE=1024
+
+#
+# Examples
+#
+# CONFIG_EXAMPLES_BUTTONS is not set
+# CONFIG_EXAMPLES_CAN is not set
+# CONFIG_EXAMPLES_CONFIGDATA is not set
+# CONFIG_EXAMPLES_CXXTEST is not set
+# CONFIG_EXAMPLES_DHCPD is not set
+# CONFIG_EXAMPLES_ELF is not set
+# CONFIG_EXAMPLES_FTPC is not set
+# CONFIG_EXAMPLES_FTPD is not set
+# CONFIG_EXAMPLES_HELLO is not set
+# CONFIG_EXAMPLES_HELLOXX is not set
+# CONFIG_EXAMPLES_JSON is not set
+# CONFIG_EXAMPLES_HIDKBD is not set
+# CONFIG_EXAMPLES_KEYPADTEST is not set
+# CONFIG_EXAMPLES_IGMP is not set
+# CONFIG_EXAMPLES_LCDRW is not set
+# CONFIG_EXAMPLES_MM is not set
+# CONFIG_EXAMPLES_MODBUS is not set
+# CONFIG_EXAMPLES_MOUNT is not set
+# CONFIG_EXAMPLES_NRF24L01TERM is not set
+CONFIG_EXAMPLES_NSH=y
+CONFIG_EXAMPLES_NSH_CXXINITIALIZE=y
+# CONFIG_EXAMPLES_NULL is not set
+# CONFIG_EXAMPLES_NX is not set
+# CONFIG_EXAMPLES_NXCONSOLE is not set
+# CONFIG_EXAMPLES_NXFFS is not set
+# CONFIG_EXAMPLES_NXFLAT is not set
+# CONFIG_EXAMPLES_NXHELLO is not set
+# CONFIG_EXAMPLES_NXIMAGE is not set
+# CONFIG_EXAMPLES_NXLINES is not set
+# CONFIG_EXAMPLES_NXTEXT is not set
+# CONFIG_EXAMPLES_OSTEST is not set
+# CONFIG_EXAMPLES_PASHELLO is not set
+# CONFIG_EXAMPLES_PIPE is not set
+# CONFIG_EXAMPLES_POSIXSPAWN is not set
+# CONFIG_EXAMPLES_QENCODER is not set
+# CONFIG_EXAMPLES_RGMP is not set
+# CONFIG_EXAMPLES_ROMFS is not set
+# CONFIG_EXAMPLES_SENDMAIL is not set
+# CONFIG_EXAMPLES_SERLOOP is not set
+# CONFIG_EXAMPLES_SLCD is not set
+# CONFIG_EXAMPLES_SMART_TEST is not set
+# CONFIG_EXAMPLES_SMART is not set
+# CONFIG_EXAMPLES_TCPECHO is not set
+# CONFIG_EXAMPLES_TELNETD is not set
+# CONFIG_EXAMPLES_THTTPD is not set
+# CONFIG_EXAMPLES_TIFF is not set
+# CONFIG_EXAMPLES_TOUCHSCREEN is not set
+# CONFIG_EXAMPLES_UDP is not set
+# CONFIG_EXAMPLES_UIP is not set
+# CONFIG_EXAMPLES_USBSERIAL is not set
+# CONFIG_EXAMPLES_USBTERM is not set
+# CONFIG_EXAMPLES_WATCHDOG is not set
+
+#
+# Graphics Support
+#
+# CONFIG_TIFF is not set
+
+#
+# Interpreters
+#
+# CONFIG_INTERPRETERS_FICL is not set
+# CONFIG_INTERPRETERS_PCODE is not set
+
+#
+# Network Utilities
+#
+
+#
+# Networking Utilities
+#
+# CONFIG_NETUTILS_CODECS is not set
+# CONFIG_NETUTILS_DHCPD is not set
+# CONFIG_NETUTILS_FTPC is not set
+# CONFIG_NETUTILS_FTPD is not set
+# CONFIG_NETUTILS_JSON is not set
+# CONFIG_NETUTILS_SMTP is not set
+# CONFIG_NETUTILS_TFTPC is not set
+# CONFIG_NETUTILS_THTTPD is not set
+# CONFIG_NETUTILS_UIPLIB is not set
+# CONFIG_NETUTILS_WEBCLIENT is not set
+
+#
+# FreeModBus
+#
+# CONFIG_MODBUS is not set
+
+#
+# NSH Library
+#
+CONFIG_NSH_LIBRARY=y
+CONFIG_NSH_READLINE=y
+# CONFIG_NSH_CLE is not set
+CONFIG_NSH_BUILTIN_APPS=y
+
+#
+# Disable Individual commands
+#
+CONFIG_NSH_DISABLE_ADDROUTE=y
+# CONFIG_NSH_DISABLE_CAT is not set
+# CONFIG_NSH_DISABLE_CD is not set
+# CONFIG_NSH_DISABLE_CP is not set
+# CONFIG_NSH_DISABLE_CMP is not set
+# CONFIG_NSH_DISABLE_DD is not set
+# CONFIG_NSH_DISABLE_DF is not set
+CONFIG_NSH_DISABLE_DELROUTE=y
+# CONFIG_NSH_DISABLE_ECHO is not set
+# CONFIG_NSH_DISABLE_EXEC is not set
+# CONFIG_NSH_DISABLE_EXIT is not set
+# CONFIG_NSH_DISABLE_FREE is not set
+# CONFIG_NSH_DISABLE_GET is not set
+# CONFIG_NSH_DISABLE_HELP is not set
+# CONFIG_NSH_DISABLE_HEXDUMP is not set
+CONFIG_NSH_DISABLE_IFCONFIG=y
+# CONFIG_NSH_DISABLE_KILL is not set
+CONFIG_NSH_DISABLE_LOSETUP=y
+# CONFIG_NSH_DISABLE_LS is not set
+# CONFIG_NSH_DISABLE_MB is not set
+# CONFIG_NSH_DISABLE_MKDIR is not set
+# CONFIG_NSH_DISABLE_MKFATFS is not set
+# CONFIG_NSH_DISABLE_MKFIFO is not set
+# CONFIG_NSH_DISABLE_MKRD is not set
+# CONFIG_NSH_DISABLE_MH is not set
+# CONFIG_NSH_DISABLE_MOUNT is not set
+# CONFIG_NSH_DISABLE_MW is not set
+# CONFIG_NSH_DISABLE_PS is not set
+# CONFIG_NSH_DISABLE_PUT is not set
+# CONFIG_NSH_DISABLE_PWD is not set
+# CONFIG_NSH_DISABLE_RM is not set
+# CONFIG_NSH_DISABLE_RMDIR is not set
+# CONFIG_NSH_DISABLE_SET is not set
+# CONFIG_NSH_DISABLE_SH is not set
+# CONFIG_NSH_DISABLE_SLEEP is not set
+# CONFIG_NSH_DISABLE_TEST is not set
+# CONFIG_NSH_DISABLE_UMOUNT is not set
+# CONFIG_NSH_DISABLE_UNSET is not set
+# CONFIG_NSH_DISABLE_USLEEP is not set
+# CONFIG_NSH_DISABLE_WGET is not set
+# CONFIG_NSH_DISABLE_XD is not set
+
+#
+# Configure Command Options
+#
+CONFIG_NSH_CMDOPT_DF_H=y
+CONFIG_NSH_CODECS_BUFSIZE=128
+CONFIG_NSH_CMDOPT_HEXDUMP=y
+CONFIG_NSH_PROC_MOUNTPOUNT="/proc"
+CONFIG_NSH_FILEIOSIZE=2048
+# CONFIG_NSH_STRERROR is not set
+CONFIG_NSH_LINELEN=80
+# CONFIG_NSH_DISABLE_SEMICOLON is not set
+CONFIG_NSH_CMDPARMS=y
+CONFIG_NSH_TMPDIR="/tmp"
+CONFIG_NSH_MAXARGUMENTS=6
+CONFIG_NSH_ARGCAT=y
+CONFIG_NSH_NESTDEPTH=3
+# CONFIG_NSH_DISABLESCRIPT is not set
+# CONFIG_NSH_DISABLE_ITEF is not set
+# CONFIG_NSH_DISABLE_LOOPS is not set
+# CONFIG_NSH_DISABLEBG is not set
+CONFIG_NSH_CONSOLE=y
+
+#
+# USB Trace Support
+#
+# CONFIG_NSH_CONDEV is not set
+# CONFIG_NSH_ARCHINIT is not set
+
+#
+# NxWidgets/NxWM
+#
+
+#
+# Platform-specific Support
+#
+# CONFIG_PLATFORM_CONFIGDATA is not set
+
+#
+# System Libraries and NSH Add-Ons
+#
+
+#
+# USB CDC/ACM Device Commands
+#
+
+#
+# USB Composite Device Commands
+#
+
+#
+# Custom Free Memory Command
+#
+# CONFIG_SYSTEM_FREE is not set
+
+#
+# I2C tool
+#
+
+#
+# INI File Parser
+#
+# CONFIG_SYSTEM_INIFILE is not set
+
+#
+# FLASH Program Installation
+#
+# CONFIG_SYSTEM_INSTALL is not set
+
+#
+# FLASH Erase-all Command
+#
+
+#
+# NxPlayer media player library / command Line
+#
+# CONFIG_SYSTEM_NXPLAYER is not set
+
+#
+# RAM test
+#
+# CONFIG_SYSTEM_RAMTEST is not set
+
+#
+# readline()
+#
+CONFIG_SYSTEM_READLINE=y
+CONFIG_READLINE_ECHO=y
+
+#
+# Power Off
+#
+# CONFIG_SYSTEM_POWEROFF is not set
+
+#
+# RAMTRON
+#
+# CONFIG_SYSTEM_RAMTRON is not set
+
+#
+# SD Card
+#
+CONFIG_SYSTEM_SDCARD=y
+
+#
+# Sysinfo
+#
+CONFIG_SYSTEM_SYSINFO=y
+CONFIG_SYSTEM_SYSINFO_STACKSIZE=1024
+
+#
+# USB Monitor
+#
+
+#
+# EMACS-like Command Line Editor
+#
+# CONFIG_SYSTEM_CLE is not set
+
+#
+# VI Work-Alike Editor
+#
+# CONFIG_SYSTEM_VI is not set
+
+#
+# Stack Monitor
+#
+
+#
+# USB Mass Storage Device Commands
+#
+
+#
+# Zmodem Commands
+#
+# CONFIG_SYSTEM_ZMODEM is not set
diff --git a/nuttx/configs/sam4s-xplained-pro/nsh/setenv.sh b/nuttx/configs/sam4s-xplained-pro/nsh/setenv.sh
new file mode 100644
index 000000000..f0cd5dedc
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/nsh/setenv.sh
@@ -0,0 +1,73 @@
+#!/bin/bash
+# configs/sam4s-xplained-pro/nsh/setenv.sh
+#
+#   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+if [ "$_" = "$0" ] ; then
+  echo "You must source this script, not run it!" 1>&2
+  exit 1
+fi
+
+WD=`pwd`
+if [ ! -x "setenv.sh" ]; then
+  echo "This script must be executed from the top-level NuttX build directory"
+  exit 1
+fi
+
+if [ -z "${PATH_ORIG}" ]; then
+  export PATH_ORIG="${PATH}"
+fi
+
+# This is the Cygwin path to the location where I installed the Atmel GCC
+# toolchain under Windows.  You will also have to edit this if you install
+# this toolchain in any other location
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/Atmel/Atmel Toolchain/ARM GCC/Native/4.7.3.99/arm-gnu-toolchain/bin"
+
+# This is the Cygwin path to the location where I installed the CodeSourcery
+# toolchain under windows.  You will also have to edit this if you install
+# the CodeSourcery toolchain in any other location
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
+
+# These are the Cygwin paths to the locations where I installed the Atollic
+# toolchain under windows.  You will also have to edit this if you install
+# the Atollic toolchain in any other location.  /usr/bin is added before
+# the Atollic bin path because there is are binaries named gcc.exe and g++.exe
+# at those locations as well.
+#export TOOLCHAIN_BIN="/usr/bin:/cygdrive/c/Program Files (x86)/Atollic/TrueSTUDIO for ARM Pro 2.3.0/ARMTools/bin"
+
+# This is the Cygwin path to the location where I build the buildroot
+# toolchain.
+export TOOLCHAIN_BIN="${WD}/../misc/buildroot/build_arm_nofpu/staging_dir/bin"
+
+# Add the path to the toolchain to the PATH varialble
+export PATH="${TOOLCHAIN_BIN}:/sbin:/usr/sbin:${PATH_ORIG}"
+
+echo "PATH : ${PATH}"
diff --git a/nuttx/configs/sam4s-xplained-pro/scripts/ld.script b/nuttx/configs/sam4s-xplained-pro/scripts/ld.script
new file mode 100644
index 000000000..dee9c2218
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/scripts/ld.script
@@ -0,0 +1,126 @@
+/****************************************************************************
+ * configs/sam4s-xplained-pro/scripts/ld.script
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/* The ATSAM4SD32C has 2 banks of 1MB of FLASH beginning at address 
+ * 0x0040:0000 and 160KB of SRAM beginning at address 0x2000:0000
+ *
+ * Flash 0 / 1 can be swapped with the GPNVM bit 2. We'll avoid using
+ * the 2nd bank to allow this as an option for firmware upgrading or failsafe
+ * 
+ */
+
+MEMORY
+{
+    flash0 (rx)  : ORIGIN = 0x00400000, LENGTH = 1024K
+    flash1 (rx)  : ORIGIN = 0x00500000, LENGTH = 1024K
+    sram   (rwx) : ORIGIN = 0x20000000, LENGTH = 160K
+}
+
+OUTPUT_ARCH(arm)
+ENTRY(_stext)
+SECTIONS
+{
+	.text : {
+		_stext = ABSOLUTE(.);
+		*(.vectors)
+		*(.text .text.*)
+		*(.fixup)
+		*(.gnu.warning)
+		*(.rodata .rodata.*)
+		*(.gnu.linkonce.t.*)
+		*(.glue_7)
+		*(.glue_7t)
+		*(.got)
+		*(.gcc_except_table)
+		*(.gnu.linkonce.r.*)
+		_etext = ABSOLUTE(.);
+	} > flash0
+
+	.init_section : {
+		_sinit = ABSOLUTE(.);
+		*(.init_array .init_array.*)
+		_einit = ABSOLUTE(.);
+	} > flash0
+
+	.ARM.extab : {
+		*(.ARM.extab*)
+	} >flash0
+
+	__exidx_start = ABSOLUTE(.);
+	.ARM.exidx : {
+		*(.ARM.exidx*)
+	} >flash0
+	__exidx_end = ABSOLUTE(.);
+
+	.data : {
+		_sdata = ABSOLUTE(.);
+		*(.data .data.*)
+		*(.gnu.linkonce.d.*)
+		CONSTRUCTORS
+		_edata = ABSOLUTE(.);
+	} > sram AT > flash0
+
+	_eronly = LOADADDR(.data);
+
+	.ramfunc ALIGN(4): {
+		_sramfuncs = ABSOLUTE(.);
+		*(.ramfunc  .ramfunc.*)
+		_eramfuncs = ABSOLUTE(.);
+	} > sram AT > flash0
+
+	_framfuncs = LOADADDR(.ramfunc);
+
+	.bss : {
+		_sbss = ABSOLUTE(.);
+		*(.bss .bss.*)
+		*(.gnu.linkonce.b.*)
+		*(COMMON)
+		_ebss = ABSOLUTE(.);
+	} > sram
+
+	/* Stabs debugging sections. */
+	.stab 0 : { *(.stab) }
+	.stabstr 0 : { *(.stabstr) }
+	.stab.excl 0 : { *(.stab.excl) }
+	.stab.exclstr 0 : { *(.stab.exclstr) }
+	.stab.index 0 : { *(.stab.index) }
+	.stab.indexstr 0 : { *(.stab.indexstr) }
+	.comment 0 : { *(.comment) }
+	.debug_abbrev 0 : { *(.debug_abbrev) }
+	.debug_info 0 : { *(.debug_info) }
+	.debug_line 0 : { *(.debug_line) }
+	.debug_pubnames 0 : { *(.debug_pubnames) }
+	.debug_aranges 0 : { *(.debug_aranges) }
+}
diff --git a/nuttx/configs/sam4s-xplained-pro/src/Makefile b/nuttx/configs/sam4s-xplained-pro/src/Makefile
new file mode 100644
index 000000000..c91b1f421
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/src/Makefile
@@ -0,0 +1,100 @@
+############################################################################
+# configs/sam4s-xplained-pro/src/Makefile
+#
+#   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+-include $(TOPDIR)/Make.defs
+
+CFLAGS += -I$(TOPDIR)/sched
+
+ASRCS =
+AOBJS = $(ASRCS:.S=$(OBJEXT))
+
+CSRCS = sam_boot.c
+
+ifeq ($(CONFIG_HAVE_CXX),y)
+CSRCS += sam_cxxinitialize.c
+endif
+
+ifeq ($(CONFIG_ARCH_LEDS),y)
+CSRCS += sam_autoleds.c
+else
+CSRCS += sam_userleds.c
+endif
+
+ifeq ($(CONFIG_ARCH_BUTTONS),y)
+CSRCS += sam_buttons.c
+endif
+
+COBJS = $(CSRCS:.c=$(OBJEXT))
+
+SRCS = $(ASRCS) $(CSRCS)
+OBJS = $(AOBJS) $(COBJS)
+
+ARCH_SRCDIR = $(TOPDIR)/arch/$(CONFIG_ARCH)/src
+ifeq ($(WINTOOL),y)
+  CFLAGS += -I "${shell cygpath -w $(ARCH_SRCDIR)/chip}"
+  CFLAGS += -I "${shell cygpath -w $(ARCH_SRCDIR)/common}"
+  CFLAGS += -I "${shell cygpath -w $(ARCH_SRCDIR)/armv7-m}"
+else
+  CFLAGS += -I$(ARCH_SRCDIR)/chip
+  CFLAGS += -I$(ARCH_SRCDIR)/common
+  CFLAGS += -I$(ARCH_SRCDIR)/armv7-m
+endif
+
+all: libboard$(LIBEXT)
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS) $(LINKOBJS): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+libboard$(LIBEXT): $(OBJS)
+	$(call ARCHIVE, $@, $(OBJS))
+
+.depend: Makefile $(SRCS)
+	$(Q) $(MKDEP) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
+	$(Q) touch $@
+
+depend: .depend
+
+clean:
+	$(call DELFILE, libboard$(LIBEXT))
+	$(call CLEAN)
+
+distclean: clean
+	$(call DELFILE, Make.dep)
+	$(call DELFILE, .depend)
+
+-include Make.dep
diff --git a/nuttx/configs/sam4s-xplained-pro/src/sam4s-xplained-pro.h b/nuttx/configs/sam4s-xplained-pro/src/sam4s-xplained-pro.h
new file mode 100644
index 000000000..289f51718
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/src/sam4s-xplained-pro.h
@@ -0,0 +1,128 @@
+/************************************************************************************
+ * configs/sam4s-xplained-pro/src/sam4s-xplained-pro.h
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+#ifndef __CONFIGS_SAM4S_XPLAINED_SRC_SAM4S_XPLAINED_H
+#define __CONFIGS_SAM4S_XPLAINED_SRC_SAM4S_XPLAINED_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/compiler.h>
+
+#include <stdint.h>
+
+#include <arch/irq.h>
+#include <nuttx/irq.h>
+
+#include "chip/sam_pinmap.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+/* There are four LEDs on board the SAM4S Xplained board, two of these can be
+ * controlled by software in the SAM4S:
+ *
+ *   LED              GPIO
+ *   ---------------- -----
+ *   D9  Yellow LED   PC10
+ *   D10 Yellow LED   PC17
+ *
+ * Both can be illuminated by driving the GPIO output to ground (low).
+ *
+ * These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
+ * defined.  In that case, the usage by the board port is defined in
+ * include/board.h and src/up_leds.c. The LEDs are used to encode OS-related
+ * events as follows:
+ *
+ *   SYMBOL                Meaning                     LED state
+ *                                                   D9     D10
+ *   -------------------  -----------------------  -------- --------
+ *   LED_STARTED          NuttX has been started     OFF      OFF
+ *   LED_HEAPALLOCATE     Heap has been allocated    OFF      OFF
+ *   LED_IRQSENABLED      Interrupts enabled         OFF      OFF
+ *   LED_STACKCREATED     Idle stack created         ON       OFF
+ *   LED_INIRQ            In an interrupt              No change
+ *   LED_SIGNAL           In a signal handler          No change
+ *   LED_ASSERTION        An assertion failed          No change
+ *   LED_PANIC            The system has crashed     OFF      Blinking
+ *   LED_IDLE             MCU is is sleep mode         Not used
+ *
+ * Thus if D9 is statically on, NuttX has successfully booted and is,
+ * apparently, running normally.  If D10 is flashing at approximately
+ * 2Hz, then a fatal error has been detected and the system has halted.
+ */
+
+#define GPIO_D301    (GPIO_OUTPUT | GPIO_CFG_PULLUP | GPIO_OUTPUT_SET | \
+                      GPIO_PORT_PIOC | GPIO_PIN23)
+
+/* Mechanical buttons:
+ *
+ * The SAM4S Xplained Pro has two mechanical buttons. One button is the RESET button
+ * connected to the SAM4S reset line and the other is a generic user configurable
+ * button labeled SW0. When a button is pressed it will drive the I/O line to GND.
+ *
+ *   PA2 SW0
+ */
+
+#define GPIO_SW0     (GPIO_INPUT | GPIO_CFG_PULLUP | GPIO_CFG_DEGLITCH | \
+                      GPIO_INT_BOTHEDGES | GPIO_PORT_PIOA | GPIO_PIN2)
+#define IRQ_SW0      SAM_IRQ_PA2
+
+/************************************************************************************
+ * Public Types
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public data
+ ************************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: board_led_initialize
+ ************************************************************************************/
+
+#ifdef CONFIG_ARCH_LEDS
+void board_led_initialize(void);
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __CONFIGS_SAM4S_XPLAINED_SRC_SAM4S_XPLAINED_H */
diff --git a/nuttx/configs/sam4s-xplained-pro/src/sam_autoleds.c b/nuttx/configs/sam4s-xplained-pro/src/sam_autoleds.c
new file mode 100644
index 000000000..d2391a208
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/src/sam_autoleds.c
@@ -0,0 +1,150 @@
+/****************************************************************************
+ * configs/sam4s-xplained-pro/src/sam_autoleds.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "sam_gpio.h"
+#include "sam4s-xplained-pro.h"
+
+#ifdef CONFIG_ARCH_LEDS
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+/* If CONFIG_ARCH_LEDs is defined, then NuttX will control the LED on
+ * board the SAM4S Xplained Pro.  The following definitions describe how NuttX
+ * controls the LEDs:
+ *
+ *   SYMBOL                Meaning                     LED state
+ *                                                   D9     D10
+ *   -------------------  -----------------------  -------- --------
+ *   LED_STARTED          NuttX has been started     OFF
+ *   LED_HEAPALLOCATE     Heap has been allocated    OFF
+ *   LED_IRQSENABLED      Interrupts enabled         OFF
+ *   LED_STACKCREATED     Idle stack created         ON 
+ *   LED_INIRQ            In an interrupt            No change
+ *   LED_SIGNAL           In a signal handler        No change
+ *   LED_ASSERTION        An assertion failed        No change
+ *   LED_PANIC            The system has crashed     OFF
+ *   LED_IDLE             MCU is is sleep mode       Not used
+ */
+
+/* CONFIG_DEBUG_LEDS enables debug output from this file (needs CONFIG_DEBUG
+ * with CONFIG_DEBUG_VERBOSE too)
+ */
+
+#ifdef CONFIG_DEBUG_LEDS
+#  define leddbg  lldbg
+#  define ledvdbg llvdbg
+#else
+#  define leddbg(x...)
+#  define ledvdbg(x...)
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_led_initialize
+ ****************************************************************************/
+
+void board_led_initialize(void)
+{
+  /* Configure LED GPIO for output */
+
+  sam_configgpio(GPIO_D301);
+}
+
+/****************************************************************************
+ * Name: board_led_on
+ ****************************************************************************/
+
+void board_led_on(int led)
+{
+  bool led1on = false;
+
+  switch (led)
+    {
+      case 0:  /* LED_STARTED, LED_HEAPALLOCATE, LED_IRQSENABLED */
+        break;
+
+      case 1:  /* LED_STACKCREATED */
+        led1on = true;
+        break;
+
+      default:
+      case 2:  /* LED_INIRQ, LED_SIGNAL, LED_ASSERTION */
+        return;
+
+      case 3:  /* LED_PANIC */
+        break;
+    }
+
+  sam_gpiowrite(GPIO_D301, led1on);
+}
+
+/****************************************************************************
+ * Name: board_led_off
+ ****************************************************************************/
+
+void board_led_off(int led)
+{
+  if (led != 2)
+    {
+      sam_gpiowrite(GPIO_D301, false);
+    }
+}
+
+#endif /* CONFIG_ARCH_LEDS */
diff --git a/nuttx/configs/sam4s-xplained-pro/src/sam_boot.c b/nuttx/configs/sam4s-xplained-pro/src/sam_boot.c
new file mode 100644
index 000000000..bfc7a0bdd
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/src/sam_boot.c
@@ -0,0 +1,75 @@
+/************************************************************************************
+ * configs/sam4s-xplained-pro/src/sam_boot.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+
+#include "sam4s-xplained-pro.h"
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: sam_boardinitialize
+ *
+ * Description:
+ *   All SAM3U architectures must provide the following entry point.  This entry point
+ *   is called early in the intitialization -- after all memory has been configured
+ *   and mapped but before any devices have been initialized.
+ *
+ ************************************************************************************/
+
+void sam_boardinitialize(void)
+{
+#ifdef CONFIG_ARCH_LEDS
+  /* Configure on-board LEDs if LED support has been selected. */
+
+  board_led_initialize();
+#endif
+}
diff --git a/nuttx/configs/sam4s-xplained-pro/src/sam_buttons.c b/nuttx/configs/sam4s-xplained-pro/src/sam_buttons.c
new file mode 100644
index 000000000..8ca6fa54c
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/src/sam_buttons.c
@@ -0,0 +1,157 @@
+/****************************************************************************
+ * configs/sam4s-xplained-pro/src/sam_buttons.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+
+#include <nuttx/arch.h>
+#include <nuttx/irq.h>
+
+#include <arch/irq.h>
+#include <arch/board/board.h>
+
+#include "sam_gpio.h"
+#include "sam4s-xplained-pro.h"
+
+#ifdef CONFIG_ARCH_BUTTONS
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static xcpt_t g_irqsw0;
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: board_button_initialize
+ *
+ * Description:
+ *   board_button_initialize() must be called to initialize button resources.  After
+ *   that, board_buttons() may be called to collect the current state of all
+ *   buttons or board_button_irq() may be called to register button interrupt
+ *   handlers.
+ *
+ ****************************************************************************/
+
+void board_button_initialize(void)
+{
+  (void)sam_configgpio(GPIO_SW0);
+}
+
+/************************************************************************************
+ * Name: board_buttons
+ *
+ * Description:
+ *   After board_button_initialize() has been called, board_buttons() may be called to collect
+ *   the state of all buttons.  board_buttons() returns an 8-bit bit set with each bit
+ *   associated with a button.  See the BUTTON* definitions above for the meaning of
+ *   each bit in the returned value.
+ *
+ ************************************************************************************/
+
+uint8_t board_buttons(void)
+{
+  return sam_gpioread(GPIO_SW0) ? 0 : BUTTON_SW0_BIT;
+}
+
+/****************************************************************************
+ * Name: board_button_irq
+ *
+ * Description:
+ *   This function may be called to register an interrupt handler that will
+ *   be called when a button is depressed or released.  The ID value is one
+ *   of the BUTTON* definitions provided above. The previous interrupt
+ *   handler address is returned (so that it may restored, if so desired).
+ *
+ * Configuration Notes:
+ *   Configuration CONFIG_AVR32_GPIOIRQ must be selected to enable the
+ *   overall GPIO IRQ feature and CONFIG_AVR32_GPIOIRQSETA and/or
+ *   CONFIG_AVR32_GPIOIRQSETB must be enabled to select GPIOs to support
+ *   interrupts on.  For button support, bits 2 and 3 must be set in
+ *   CONFIG_AVR32_GPIOIRQSETB (PB2 and PB3).
+ *
+ ****************************************************************************/
+
+#if defined(CONFIG_GPIOA_IRQ) && defined(CONFIG_ARCH_IRQBUTTONS)
+xcpt_t board_button_irq(int id, xcpt_t irqhandler)
+{
+  xcpt_t oldhandler = NULL;
+
+  if (id == BUTTON_SW0)
+    {
+      irqstate_t flags;
+
+      /* Disable interrupts until we are done.  This guarantees that the
+       * following operations are atomic.
+       */
+
+      flags = irqsave();
+
+      /* Get the old button interrupt handler and save the new one */
+
+      oldhandler = g_irqsw0;
+      g_irqsw0 = irqhandler;
+
+      /* Configure the interrupt */
+
+      sam_gpioirq(IRQ_SW0);
+      (void)irq_attach(IRQ_SW0, irqhandler);
+      sam_gpioirqenable(IRQ_SW0);
+      irqrestore(flags);
+    }
+
+  /* Return the old button handler (so that it can be restored) */
+
+  return oldhandler;
+}
+#endif
+
+#endif /* CONFIG_ARCH_BUTTONS */
diff --git a/nuttx/configs/sam4s-xplained-pro/src/sam_cxxinitialize.c b/nuttx/configs/sam4s-xplained-pro/src/sam_cxxinitialize.c
new file mode 100644
index 000000000..67b016027
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/src/sam_cxxinitialize.c
@@ -0,0 +1,153 @@
+/************************************************************************************
+ * configs/sam4s-xplained-pro/src/sam_cxxinitialize.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+
+#include <nuttx/arch.h>
+
+#include <arch/sam34/chip.h>
+#include "chip.h"
+
+#if defined(CONFIG_HAVE_CXX) && defined(CONFIG_HAVE_CXXINITIALIZE)
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+/* Debug ****************************************************************************/
+/* Non-standard debug that may be enabled just for testing the static constructors */
+
+#ifndef CONFIG_DEBUG
+#  undef CONFIG_DEBUG_CXX
+#endif
+
+#ifdef CONFIG_DEBUG_CXX
+#  define cxxdbg              dbg
+#  define cxxlldbg            lldbg
+#  ifdef CONFIG_DEBUG_VERBOSE
+#    define cxxvdbg           vdbg
+#    define cxxllvdbg         llvdbg
+#  else
+#    define cxxvdbg(x...)
+#    define cxxllvdbg(x...)
+#  endif
+#else
+#  define cxxdbg(x...)
+#  define cxxlldbg(x...)
+#  define cxxvdbg(x...)
+#  define cxxllvdbg(x...)
+#endif
+
+/************************************************************************************
+ * Private Types
+ ************************************************************************************/
+/* This type defines one entry in initialization array */
+
+typedef void (*initializer_t)(void);
+
+/************************************************************************************
+ * External references
+ ************************************************************************************/
+/* _sinit and _einit are symbols exported by the linker script that mark the
+ * beginning and the end of the C++ initialization section.
+ */
+
+extern initializer_t _sinit;
+extern initializer_t _einit;
+
+/* _stext and _etext are symbols exported by the linker script that mark the
+ * beginning and the end of text.
+ */
+
+extern uint32_t _stext;
+extern uint32_t _etext;
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/****************************************************************************
+ * Name: up_cxxinitialize
+ *
+ * Description:
+ *   If C++ and C++ static constructors are supported, then this function
+ *   must be provided by board-specific logic in order to perform
+ *   initialization of the static C++ class instances.
+ *
+ *   This function should then be called in the application-specific
+ *   user_start logic in order to perform the C++ initialization.  NOTE
+ *   that no component of the core NuttX RTOS logic is involved; This
+ *   function defintion only provides the 'contract' between application
+ *   specific C++ code and platform-specific toolchain support
+ *
+ ***************************************************************************/
+
+void up_cxxinitialize(void)
+{
+  initializer_t *initp;
+
+  cxxdbg("_sinit: %p _einit: %p _stext: %p _etext: %p\n",
+         &_sinit, &_einit, &_stext, &_etext);
+
+  /* Visit each entry in the initialization table */
+
+  for (initp = &_sinit; initp != &_einit; initp++)
+    {
+      initializer_t initializer = *initp;
+      cxxdbg("initp: %p initializer: %p\n", initp, initializer);
+
+      /* Make sure that the address is non-NULL and lies in the text region
+       * defined by the linker script.  Some toolchains may put NULL values
+       * or counts in the initialization table
+       */
+
+      if ((void*)initializer > (void*)&_stext && (void*)initializer < (void*)&_etext)
+        {
+          cxxdbg("Calling %p\n", initializer);
+          initializer();
+        }
+    }
+}
+
+#endif /* CONFIG_HAVE_CXX && CONFIG_HAVE_CXXINITIALIZE */
diff --git a/nuttx/configs/sam4s-xplained-pro/src/sam_userleds.c b/nuttx/configs/sam4s-xplained-pro/src/sam_userleds.c
new file mode 100644
index 000000000..15f524942
--- /dev/null
+++ b/nuttx/configs/sam4s-xplained-pro/src/sam_userleds.c
@@ -0,0 +1,133 @@
+/****************************************************************************
+ * configs/sam4s-xplained-pro/src/sam_userleds.c
+ *
+ *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <debug.h>
+
+#include <arch/board/board.h>
+
+#include "chip.h"
+#include "sam_gpio.h"
+#include "sam4s-xplained-pro.h"
+
+#ifndef CONFIG_ARCH_LEDS
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* CONFIG_DEBUG_LEDS enables debug output from this file (needs CONFIG_DEBUG
+ * with CONFIG_DEBUG_VERBOSE too)
+ */
+
+#ifdef CONFIG_DEBUG_LEDS
+#  define leddbg  lldbg
+#  define ledvdbg llvdbg
+#else
+#  define leddbg(x...)
+#  define ledvdbg(x...)
+#endif
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: sam_ledinit
+ ****************************************************************************/
+
+void sam_ledinit(void)
+{
+  /* Configure D301 GPIO for output */
+
+  sam_configgpio(GPIO_D301);
+}
+
+/****************************************************************************
+ * Name: sam_setled
+ ****************************************************************************/
+
+void sam_setled(int led, bool ledon)
+{
+  uint32_t ledcfg;
+
+  if (led == BOARD_D301)
+    {
+      ledcfg = GPIO_D301;
+    }
+  else
+    {
+      return;
+    }
+
+  sam_gpiowrite(ledcfg, ledon);
+}
+
+/****************************************************************************
+ * Name: sam_setleds
+ ****************************************************************************/
+
+void sam_setleds(uint8_t ledset)
+{
+  bool ledon;
+
+  ledon = ((ledset & BOARD_D301_BIT) != 0);
+  sam_gpiowrite(GPIO_D301, ledon);
+}
+
+#endif /* !CONFIG_ARCH_LEDS */