diff --git a/arch/arm/src/lpc2378/lpc23xx_head.S b/arch/arm/src/lpc2378/lpc23xx_head.S
index 30426315801..bc11ed0ece4 100644
--- a/arch/arm/src/lpc2378/lpc23xx_head.S
+++ b/arch/arm/src/lpc2378/lpc23xx_head.S
@@ -137,8 +137,8 @@ __start:
 
 	/* Call lowlevel init C-function */
 
-	.extern ConfigurePLL
-	ldr	r0, =ConfigurePLL
+	.extern configure_pll
+	ldr	r0, =configure_pll
 	mov	lr, pc
 	bx	r0
 
diff --git a/arch/arm/src/lpc2378/lpc23xx_io.c b/arch/arm/src/lpc2378/lpc23xx_io.c
index 509a785ae6f..c824e1dfca0 100644
--- a/arch/arm/src/lpc2378/lpc23xx_io.c
+++ b/arch/arm/src/lpc2378/lpc23xx_io.c
@@ -53,14 +53,14 @@
  ****************************************************************************/
 
 /****************************************************************************
- * Name: IO_Init()
+ * Name: io_init()
  *
  * Description:
  *   Initialize the target board before running the main()
  *
  ****************************************************************************/
 
-void IO_Init(void)
+void io_init(void)
 {
   uint32_t regval;
 
diff --git a/arch/arm/src/lpc2378/lpc23xx_pllsetup.c b/arch/arm/src/lpc2378/lpc23xx_pllsetup.c
index ca9de412f33..5aa3810c1b5 100644
--- a/arch/arm/src/lpc2378/lpc23xx_pllsetup.c
+++ b/arch/arm/src/lpc2378/lpc23xx_pllsetup.c
@@ -70,7 +70,7 @@
 #include "lpc23xx_pinsel.h"
 #include "lpc23xx_scb.h"
 
-void IO_Init(void);
+void io_init(void);
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -163,13 +163,13 @@ static inline void up_scbpllfeed(void)
 }
 
 /****************************************************************************
- * Name: ConfigurePLL
+ * Name: configure_pll
  ****************************************************************************/
 
-void ConfigurePLL(void)
+void configure_pll(void)
 {
-  uint32_t MSel;
-  uint32_t NSel;
+  uint32_t m_sel;
+  uint32_t n_sel;
 
   /* LPC2378 Rev.'-' errata Enable the Ethernet block to enable 16k EnetRAM */
 
@@ -232,9 +232,9 @@ void ConfigurePLL(void)
 
   while ((SCB_PLLSTAT & (1 << 26)) == 0);
 
-  MSel = SCB_PLLSTAT & 0x00007fff;
-  NSel = (SCB_PLLSTAT & 0x00ff0000) >> 16;
-  while ((MSel != PLL_M) && (NSel != PLL_N));
+  m_sel = SCB_PLLSTAT & 0x00007fff;
+  n_sel = (SCB_PLLSTAT & 0x00ff0000) >> 16;
+  while ((m_sel != PLL_M) && (n_sel != PLL_N));
 
   /* Enable and connect */
 
@@ -255,7 +255,7 @@ void ConfigurePLL(void)
 
   SCB_SCS |= 0x01;
 
-  IO_Init();
+  io_init();
 
   return;
 }