diff --git a/arch/arm/src/lm3s/chip.h b/arch/arm/src/lm3s/chip.h
index e0900c7dfb..9613e4c077 100644
--- a/arch/arm/src/lm3s/chip.h
+++ b/arch/arm/src/lm3s/chip.h
@@ -60,8 +60,28 @@
  * Public Data
  ************************************************************************************/
 
-/************************************************************************************
- * Public Functions
- ************************************************************************************/
+#ifndef __ASSEMBLY__
 
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/* Defined in lm3s_lowputc.c */
+
+EXTERN void up_lowsetup(void);
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
 #endif /* __ARCH_ARM_SRC_LM3S_CHIP_H */
diff --git a/arch/arm/src/lm3s/lm3s_lowputc.c b/arch/arm/src/lm3s/lm3s_lowputc.c
index 554e57f7ff..974488600c 100644
--- a/arch/arm/src/lm3s/lm3s_lowputc.c
+++ b/arch/arm/src/lm3s/lm3s_lowputc.c
@@ -219,8 +219,9 @@ void up_lowputc(char ch)
 
 void up_lowsetup(void)
 {
+  uint32 rcgc1;
 #ifdef HAVE_CONSOLE
-  uint16 ctl;
+  uint32 ctl;
 
   /* Enable the selected console device */
   /* 1. Disable the UART by clearing the UARTEN bit in the UART CTL register */
@@ -247,18 +248,34 @@ void up_lowsetup(void)
   putreg32(ctl, LM3S_CONSOLE_BASE+LM3S_UART_CTL_OFFSET);
 #endif
 
-  /* Configure GPIO pins to enable all UARTs in the configuration
-   * (the serial driver later depends on this configuration) 
+  /* Peripheral clocking to the selected UART modules and to the GPIO
+   * modules used for the pin configuration.  NOTE: this function is
+   * called very early in the boot sequence so we do not need to be
+   * concerned about exclusive access to registers.
+   */
+
+  rcgc1  = getreg32(LM3S_SYSCON_RCGC1);
+#if !defined(CONFIG_UART0_DISABLE) && !defined(CONFIG_UART1_DISABLE)
+  rcgc1 |= (SYSCON_RCGC1_UART0|SYSCON_RCGC2_GPIOA|SYSCON_RCGC1_UART1|SYSCON_RCGC2_GPIOD);
+#elif !defined(CONFIG_UART0_DISABLE)
+  rcgc1 |= (SYSCON_RCGC1_UART0|SYSCON_RCGC2_GPIOA);
+#elif !defined(CONFIG_UART1_DISABLE)
+  rcgc1 |= (SYSCON_RCGC1_UART1|SYSCON_RCGC2_GPIOD);
+#endif
+  putreg32(rcgc1, LM3S_SYSCON_RCGC1);
+
+  /* Then configure GPIO pins to enable the selected UARTs.  NOTE: The
+   * serial driver later depends on this pin configuration.
    */
 
 #ifndef CONFIG_UART0_DISABLE
-  lm3x_configgpio(GPIO_UART0_RX);
-  lm3x_configgpio(GPIO_UART0_TX);
+  lm3s_configgpio(GPIO_UART0_RX);
+  lm3s_configgpio(GPIO_UART0_TX);
 #endif
 
 #ifndef CONFIG_UART1_DISABLE
-  lm3x_configgpio(GPIO_UART1_RX);
-  lm3x_configgpio(GPIO_UART1_TX);
+  lm3s_configgpio(GPIO_UART1_RX);
+  lm3s_configgpio(GPIO_UART1_TX);
 #endif
 }
 
diff --git a/arch/arm/src/lm3s/lm3s_start.c b/arch/arm/src/lm3s/lm3s_start.c
index 8894117dc1..279b4a9617 100644
--- a/arch/arm/src/lm3s/lm3s_start.c
+++ b/arch/arm/src/lm3s/lm3s_start.c
@@ -87,19 +87,6 @@ extern uint32 _ebss;            /* End+1 of .bss */
 #  define showprogress(c)
 #endif
 
-/****************************************************************************
- * Name: up_lowsetup
- *
- * Description:
- *   Set up initial clocking
- *
- ****************************************************************************/
-
-static inline void up_lowsetup(void)
-{
-  up_clockconfig();
-}
-
 /****************************************************************************
  * Public Functions
  ****************************************************************************/
@@ -119,6 +106,7 @@ void _start(void)
 
   /* Configure the uart so that we can get debug output as soon as possible */
 
+  up_clockconfig();
   up_lowsetup();
   showprogress('A');
 
diff --git a/arch/arm/src/str71x/str71x_serial.c b/arch/arm/src/str71x/str71x_serial.c
index 38bbd149d0..9ee2d7434e 100644
--- a/arch/arm/src/str71x/str71x_serial.c
+++ b/arch/arm/src/str71x/str71x_serial.c
@@ -154,7 +154,7 @@
 #  elif CONFIG_STR71X_UART3
 #    define TTYS1_DEV   g_uart3port       /* UART3 is tty1 */
 #  endif
-#elif defined(CONFIG_UART2_SERIAL_CONSOLE)
+#elif defined(CONFIG_UART3_SERIAL_CONSOLE)
 #  ifndef CONFIG_STR71X_UART3
 #    error "UART3 not selected, cannot be console"
 #  endif