diff --git a/arch/arm/src/a1x/a1x_serial.c b/arch/arm/src/a1x/a1x_serial.c
index f3a9d86c4f2..425176721f2 100644
--- a/arch/arm/src/a1x/a1x_serial.c
+++ b/arch/arm/src/a1x/a1x_serial.c
@@ -751,7 +751,6 @@ static inline void up_enablebreaks(struct up_dev_s *priv, bool enable)
 #ifdef CONFIG_A1X_UART0
 static inline void a1x_uart0config(void)
 {
-  uint32_t   regval;
   irqstate_t flags;
 
   /* Step 1: Enable power to UART0 */
@@ -773,7 +772,6 @@ static inline void a1x_uart0config(void)
 #ifdef CONFIG_A1X_UART1
 static inline void a1x_uart1config(void)
 {
-  uint32_t   regval;
   irqstate_t flags;
 
   /* Step 1: Enable power to UART1 */
@@ -795,7 +793,6 @@ static inline void a1x_uart1config(void)
 #ifdef CONFIG_A1X_UART2
 static inline void a1x_uart2config(void)
 {
-  uint32_t   regval;
   irqstate_t flags;
 
   /* Step 1: Enable power to UART2 */
@@ -817,7 +814,6 @@ static inline void a1x_uart2config(void)
 #ifdef CONFIG_A1X_UART3
 static inline void a1x_uart3config(void)
 {
-  uint32_t   regval;
   irqstate_t flags;
 
   /* Step 1: Enable power to UART3 */
@@ -839,7 +835,6 @@ static inline void a1x_uart3config(void)
 #ifdef CONFIG_A1X_UART4
 static inline void a1x_uart4config(void)
 {
-  uint32_t   regval;
   irqstate_t flags;
 
   /* Step 1: Enable power to UART4 */
@@ -861,7 +856,6 @@ static inline void a1x_uart4config(void)
 #ifdef CONFIG_A1X_UART5
 static inline void a1x_uart5config(void)
 {
-  uint32_t   regval;
   irqstate_t flags;
 
   /* Step 1: Enable power to UART5 */
@@ -883,7 +877,6 @@ static inline void a1x_uart5config(void)
 #ifdef CONFIG_A1X_UART6
 static inline void a1x_uart6config(void)
 {
-  uint32_t   regval;
   irqstate_t flags;
 
   /* Step 1: Enable power to UART6 */
@@ -905,7 +898,6 @@ static inline void a1x_uart6config(void)
 #ifdef CONFIG_A1X_UART7
 static inline void a1x_uart7config(void)
 {
-  uint32_t   regval;
   irqstate_t flags;
 
   /* Step 1: Enable power to UART7 */
diff --git a/arch/arm/src/lpc17xx/lpc17_lcd.c b/arch/arm/src/lpc17xx/lpc17_lcd.c
index 7b1fe62b5a7..ebc43759688 100644
--- a/arch/arm/src/lpc17xx/lpc17_lcd.c
+++ b/arch/arm/src/lpc17xx/lpc17_lcd.c
@@ -763,7 +763,6 @@ void fb_uninitialize(void)
   /* Turn off clocking to the LCD. modifyreg32() can do this atomically. */
 
   modifyreg32(LPC17_SYSCON_PCONP, SYSCON_PCONP_PCLCD, 0);
-  return OK;
 }
 
 /************************************************************************************
diff --git a/arch/arm/src/sama5/sam_clockconfig.c b/arch/arm/src/sama5/sam_clockconfig.c
index 5df01d159a3..7ace056b3f7 100644
--- a/arch/arm/src/sama5/sam_clockconfig.c
+++ b/arch/arm/src/sama5/sam_clockconfig.c
@@ -364,7 +364,7 @@ static void __ramfunc__ sam_mckdivider(void)
  *
  ****************************************************************************/
 
-#ifdef PMC_MCKR_H32MXDIV
+#if defined(PMC_MCKR_H32MXDIV) && defined(NEED_PLLSETUP)
 static void __ramfunc__ sam_h32mxdivider(void)
 {
   uint32_t regval;