diff --git a/configs/sam4l-xplained/README.txt b/configs/sam4l-xplained/README.txt
index ca5ecf2f9e8..ea97942f7a8 100644
--- a/configs/sam4l-xplained/README.txt
+++ b/configs/sam4l-xplained/README.txt
@@ -15,6 +15,7 @@ Contents
   - NuttX OABI "buildroot" Toolchain
   - NXFLAT Toolchain
   - LEDs
+  - Virtual COM Port
   - SAM4L Xplained Pro-specific Configuration Options
   - Configurations
 
@@ -242,6 +243,17 @@ LEDs
   apparently, running normmally.  If LED0 is flashing at approximately
   2Hz, then a fatal error has been detected and the system has halted.
 
+Virtual COM Port
+^^^^^^^^^^^^^^^^
+
+  The SAM4L Xplained Pro contains an Embedded Debugger (EDBG) that can be
+  used to program and debug the ATSAM4LC4C using Serial Wire Debug (SWD).
+  The Embedded debugger also include a Virtual Com port interface over
+  USART1.  Virtual COM port connections:
+
+    PC26 USART1 RXD
+    PC27 USART1 TXD
+
 SAM4L Xplained Pro-specific Configuration Options
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/sam4l-xplained/include/board.h b/configs/sam4l-xplained/include/board.h
index 3c8cb82e3c6..cb70aff0413 100644
--- a/configs/sam4l-xplained/include/board.h
+++ b/configs/sam4l-xplained/include/board.h
@@ -156,6 +156,19 @@
 
 #define BUTTON_SW0_BIT     (1 << BUTTON_SW0)
 
+/* Alternate Function Disambiguation ************************************************/
+/* The SAM4L Xplained Pro contains an Embedded Debugger (EDBG) that can be
+ * used to program and debug the ATSAM4LC4C using Serial Wire Debug (SWD).
+ * The Embedded debugger also include a Virtual Com port interface over
+ * USART1.  Virtual COM port connections:
+ *
+ *   PC26 USART1 RXD
+ *   PC27 USART1 TXD
+ */
+
+#define GPIO_USART1_RXD    GPIO_USART1_RXD_2
+#define GPIO_USART1_TXD    GPIO_USART1_TXD_2
+
 /************************************************************************************
  * Public Data
  ************************************************************************************/
diff --git a/configs/sam4l-xplained/ostest/defconfig b/configs/sam4l-xplained/ostest/defconfig
index e10037477ed..3cab5109b3d 100644
--- a/configs/sam4l-xplained/ostest/defconfig
+++ b/configs/sam4l-xplained/ostest/defconfig
@@ -80,6 +80,7 @@ CONFIG_ARCH_CORTEXM4=y
 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
 
@@ -128,9 +129,9 @@ CONFIG_ARCH_CHIP_SAM4L=y
 # CONFIG_SAM34_DMA is not set
 # CONFIG_SAM34_NAND is not set
 # CONFIG_SAM34_HSMCI is not set
-CONFIG_SAM34_UART=y
+# CONFIG_SAM34_UART is not set
 # CONFIG_SAM34_USART0 is not set
-# CONFIG_SAM34_USART1 is not set
+CONFIG_SAM34_USART1=y
 # CONFIG_SAM34_USART2 is not set
 # CONFIG_SAM34_USART3 is not set
 # CONFIG_SAM34_SPI is not set
@@ -138,6 +139,7 @@ CONFIG_SAM34_UART=y
 #
 # AT91SAM3 UART Configuration
 #
+CONFIG_USART1_ISUART=y
 
 #
 # AT91SAM3 GPIO Interrupt Configuration
@@ -297,20 +299,20 @@ CONFIG_DEV_NULL=y
 CONFIG_SERIAL=y
 CONFIG_DEV_LOWCONSOLE=y
 # CONFIG_16550_UART is not set
-CONFIG_ARCH_HAVE_UART=y
+CONFIG_ARCH_HAVE_USART1=y
 CONFIG_MCU_SERIAL=y
-CONFIG_UART_SERIAL_CONSOLE=y
+CONFIG_USART1_SERIAL_CONSOLE=y
 # CONFIG_NO_SERIAL_CONSOLE is not set
 
 #
-# UART Configuration
+# USART1 Configuration
 #
-CONFIG_UART_RXBUFSIZE=256
-CONFIG_UART_TXBUFSIZE=256
-CONFIG_UART_BAUD=115200
-CONFIG_UART_BITS=8
-CONFIG_UART_PARITY=0
-CONFIG_UART_2STOP=0
+CONFIG_USART1_RXBUFSIZE=256
+CONFIG_USART1_TXBUFSIZE=256
+CONFIG_USART1_BAUD=115200
+CONFIG_USART1_BITS=8
+CONFIG_USART1_PARITY=0
+CONFIG_USART1_2STOP=0
 # CONFIG_USBDEV is not set
 # CONFIG_USBHOST is not set
 # CONFIG_WIRELESS is not set