Updated README.txt files

Documentation/README.html

@@ -92,6 +92,8 @@
  |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/ez80f910200zco/README.txt"><b><i>README.txt</i></b></a>
  |   |   |- fire-stm32v2/
  |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/fire-stm32v2/README.txt"><b><i>README.txt</i></b></a>
+ |   |   |- galileo/
+ |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/galileo/README.txt"><b><i>README.txt</i></b></a>
  |   |   |- freedom-kl25z/
  |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/freedom-kl25z/README.txt"><b><i>README.txt</i></b></a>
  |   |   |- hymini-stm32v/
@@ -123,6 +125,8 @@
  |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/mikroe-stm32f4/README.txt"><b><i>README.txt</i></b></a>
  |   |   |- mirtoo/
  |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/mirtoo/README.txt"><b><i>README.txt</i></b></a>
+ |   |   |- mt-db-x3//
+ |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/mt-db-x3//README.txt"><b><i>README.txt</i></b></a>
  |   |   |- mx1ads/
  |   |   |   `- <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/mx1ads/README.txt"><b><i>README.txt</i></b></a>
  |   |   |- ne64badge/

README.txt

@@ -961,6 +961,8 @@ nuttx
  |   |   `- README.txt
  |   |-  freedom-kl25z/
  |   |   `- README.txt
+ |   |- galileo/
+ |   |   `- README.txt
  |   |- hymini-stm32v/
  |   |   `- README.txt
  |   |- kwikstik-k40/
@@ -989,6 +991,8 @@ nuttx
  |   |   `- README.txt
  |   |- mirtoo/
  |   |   `- README.txt
+ |   |- mt-db-x3/
+ |   |   `- README.txt
  |   |- mx1ads/
  |   |   `- README.txt
  |   |- ne63badge/

configs/galileo/README.txt

@@ -0,0 +1,52 @@
+README.txt
+==========
+
+  This README.txt file discusses the port of NuttX to the Intel Galileo
+  board.
+
+  NOTE: There is no port for the Galileo in place as of this writing.  At this
+  point in time, this README file is only a repository for pre-porting
+  information.  It is not clear as of this writing whether there ever will
+  be a port to the Galileo development board or not.
+
+LEDs and Buttons
+================
+
+Serial Console
+==============
+
+Serial Console
+==============
+
+  Galileo provides two options for a Serial Console:
+
+  1) UART TTL (5V/3.3V) serial communication is available on Arduino
+     digital 0 (pin 1, IO0) and digital 1 (pin 2, IO1).  The function of IO0
+     and IO1 are controlled via a TS5A23159 2-channel 2:
+     multiplexer/demultiplexer
+
+     --- ---- --------- -------------------------------------
+     PIN NAME SIGNAL    DESCRIPTION
+     --- ---- --------- -------------------------------------
+      1  IN1  IO0_MUX   Select NO1 or NC1 as IO on COM1 = IO0
+      2  NO1  LVL_RXD   IN=L, IO0=RXD
+      3  NC1  IO0_GPIO  IN=H, IO0=GPIO
+     --- ---- --------- -------------------------------------
+      5  IN2  IO1_MUX   Select NO1 or NC1 as IO on COM2 = IO1
+      4  NO2  IO1_GPIO  IN=L, IO1=GPIO
+      7  NC2  LVL_TXD   IN=H, IO2=TXD
+     --- ---- --------- -------------------------------------
+
+     The LVL_RXD/LVL_TXD driver from UART0_TXD/UART0_RXD via a TXS0108E
+     voltage level translator that brings the which brings 1.2-3.6V signals
+     to 165-5.5V.
+
+  2) In addition, a second UART provides RS-232 support via a MAX3232 driver
+     and is connected via a 3.5mm jack:  Sleeve = GND, RING=SERIAL1_RXD, and
+     TIP=SERIAL1_TXD.
+
+  UART1 may be convenient because of its built-in RS232 drivers.  But if you
+  have a standard RS-232 shield, then UART0 may be the better choice.
+
+Configurations
+==============

configs/mt-db-x3/README.txt

@@ -8,6 +8,11 @@ part.  This port was specifically performed using the ATXmega384c3.
   See the MattairTech website for further information about the MT-DB-X3:
   http://www.mattairtech.com/.
 
+  NOTE: There is no port for the XMEGA in place as of this writing.  At this
+  point in time, this README file is only a repository for pre-porting
+  information.  It is not clear as of this writing whether there ever will
+  be a port to the MT-DB-X3 development board or not.
+
 Contents
 ========