diff --git a/Documentation/README.html b/Documentation/README.html
index 38c6ab0ee4..298accc787 100644
--- a/Documentation/README.html
+++ b/Documentation/README.html
@@ -148,8 +148,6 @@ nuttx/
  |   |   `- <a href="https://bitbucket.org/nuttx/nuttx/configs/src/master/mikroe-stm32f4/README.txt" target="_blank"><b><i>README.txt</i></b></a>
  |   |- mirtoo/
  |   |   `- <a href="https://bitbucket.org/nuttx/nuttx/configs/src/master/mirtoo/README.txt" target="_blank"><b><i>README.txt</i></b></a>
- |   |- mt-db-x3//
- |   |   `- <a href="https://bitbucket.org/nuttx/nuttx/configs/src/master/mt-db-x3//README.txt" target="_blank"><b><i>README.txt</i></b></a>
  |   |- moteino-mega/
  |   |   `- <a href="https://bitbucket.org/nuttx/nuttx/configs/src/master/moteino-mega/README.txt" target="_blank"><b><i>README.txt</i></b></a>
  |   |- mx1ads/
diff --git a/README.txt b/README.txt
index 2d16a30234..4c12dca85a 100644
--- a/README.txt
+++ b/README.txt
@@ -1327,8 +1327,6 @@ nuttx/
  |   |   `- README.txt
  |   |- mirtoo/
  |   |   `- README.txt
- |   |- mt-db-x3/
- |   |   `- README.txt
  |   |- moteino-mega/
  |   |   `- README.txt
  |   |- mx1ads/
diff --git a/configs/mt-db-x3/README.txt b/configs/mt-db-x3/README.txt
deleted file mode 100644
index 5ea012e1ff..0000000000
--- a/configs/mt-db-x3/README.txt
+++ /dev/null
@@ -1,88 +0,0 @@
-README
-======
-
-  This README file discusses the port of NuttX to the MT-DB-X3 development
-  board from MattairTech.  This board may host a variety of 64-pin AVR XMega
-  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
-========
-
-  - PIO Usage
-  - LEDs and Buttons
-  - Serial Console
-  - Configurations
-
-PIO Usage
-=========
-
-  PA0  CONN_P_10 pin 1, Aref via J34
-  PA1  CONN_P_10 pin 2
-  PA2  CONN_P_10 pin 3
-  PA3  CONN_P_10 pin 4
-  PA4  CONN_P_10 pin 5
-  PA5  CONN_P_10 pin 6
-  PA6  CONN_P_10 pin 7
-  PA7  CONN_P_10 pin 8
-
-  PB0  CONN_P_10 pin 9, Aref via J25
-  PB1  CONN_P_10 pin 10
-  PB2  C4_LS CONN_P14 pin 5
-  PB3  C4_LS CONN_P14 pin 5
-  PB4  C4_LS CONN_P14 pin 5, Alt JTAG TMS
-  PB5  C4_LS CONN_P14 pin 5, Alt JTAG TDI
-  PB6  C4_LS CONN_P14 pin 5, Alt JTAG TCK
-  PB7  C4_LS CONN_P14 pin 5, Alt JTAG TDO, Voltage measurement via J15
-
-  PC0  C0_LS CONN_P14 pin 7
-  PC1  C1_LS CONN_P14 pin 8
-  PC2  C2_LS CONN_P14 pin 9
-  PC3  C3_LS CONN_P14 pin 10
-  PC4  C4_LS CONN_P14 pin 5, PDI/SPI Header pin 5 via J8
-  PC5  C5_LS CONN_P14 pin 6, PDI/SPI Header pin 4 via J8
-  PC6  C6_LS CONN_P14 pin 7, PDI/SPI Header pin 1 via J13
-  PC7  C7_LS CONN_P14 pin 8, PDI/SPI Header pin 3 via J12
-
-  PD0  CONN_P14 pin 9
-  PD1  CONN_P14 pin 10
-  PD2  CONN_P14 pin 11
-  PD3  CONN_P14 pin 12
-  PD4  CONN_P14 pin 13
-  PD5  CONN_P14 pin 14, TXB0103 Output Enable
-  PD6  CONN_P14 pin 12, USB D-
-  PD7  CONN_P14 pin 13, USB D+
-
-  PE0  CONN_P10 pin 1
-  PE1  CONN_P10 pin 2
-  PE2  CONN_P10 pin 3
-  PE3  CONN_P10 pin 4
-  PE4  CONN_P10 pin 5
-  PE5  CONN_P10 pin 6
-  PE6  CONN_P10 pin 7, TOSC1 via J28
-  PE7  CONN_P10 pin 8, TOSC1 via J29
-
-  PF0  PORT F pin 1
-  PF1  PORT F pin 2
-  PF2  PORT F pin 3
-  PF3  PORT F pin 4
-  PF4  PORT F pin 5, Bootloader jumper
-  PF5  PORT F pin 6
-  PF6  PORT F pin 7, Green LED via J31
-  PF7  PORT F pin 8, User button via J33 (otherwise reset)
-
-LEDs and Buttons
-================
-
-Serial Console
-==============
-
-Configurations
-==============