diff --git a/Makefile b/Makefile
index b952016..a5859c0 100644
--- a/Makefile
+++ b/Makefile
@@ -56,10 +56,11 @@ endif
 MK := mkdir
 RM := rm -rf
 
+# Verbose mode (V=). 0: default, 1: print out CFLAG, LDFLAG 2: print all compile command
 ifeq ("$(V)","2")
-QUIET :=
+QUIET =
 else
-QUIET := @
+QUIET = @
 endif
 
 GNU_PREFIX = arm-none-eabi
@@ -335,6 +336,8 @@ $(info CFLAGS   $(CFLAGS))
 $(info )
 $(info LDFLAGS  $(LDFLAGS))
 $(info )
+$(info ASMFLAGS $(ASMFLAGS))
+$(info )
 endif
 
 .phony: all clean size flash sd erase
@@ -438,12 +441,12 @@ $(BUILD)/%.o: %.c
 # Assemble files
 $(BUILD)/%.o: %.S
 	@echo AS $(notdir $<)
-	@$(CC) $(ASMFLAGS) $(INC_PATHS) -c -o $@ $<
+	$(QUIET)$(CC) $(ASMFLAGS) $(INC_PATHS) -c -o $@ $<
 
 # Link
 $(BUILD)/$(OUTPUT_FILENAME)-nosd.out: $(BUILD) $(OBJECTS)
 	@echo LD $(OUTPUT_FILENAME)-nosd.out
-	$(CC) $(LDFLAGS) $(OBJECTS) $(LIBS) -lm -o $@
+	$(QUIET)$(CC) $(LDFLAGS) $(OBJECTS) $(LIBS) -lm -o $@
 
 size: $(BUILD)/$(OUTPUT_FILENAME)-nosd.out
 	-@echo ''
diff --git a/src/boards/feather_nrf52832.h b/src/boards/feather_nrf52832.h
index 99cd55f..be4671a 100644
--- a/src/boards/feather_nrf52832.h
+++ b/src/boards/feather_nrf52832.h
@@ -40,32 +40,32 @@
 /*------------------------------------------------------------------*/
 /* LED
  *------------------------------------------------------------------*/
-#define LEDS_NUMBER    2
-#define LED_PRIMARY_PIN  17 // Red
-#define LED_SECONDARY_PIN 19 // Blue
-#define LED_STATE_ON   1
+#define LEDS_NUMBER        2
+#define LED_PRIMARY_PIN    17 // Red
+#define LED_SECONDARY_PIN  19 // Blue
+#define LED_STATE_ON       1
 
 /*------------------------------------------------------------------*/
 /* BUTTON
  *------------------------------------------------------------------*/
-#define BUTTONS_NUMBER 2
-#define BUTTON_1       20
-#define BUTTON_2       22
-#define BUTTON_PULL    NRF_GPIO_PIN_PULLUP
+#define BUTTONS_NUMBER     2
+#define BUTTON_1           20
+#define BUTTON_2           22
+#define BUTTON_PULL        NRF_GPIO_PIN_PULLUP
 
 /*------------------------------------------------------------------*/
 /* UART
  *------------------------------------------------------------------*/
-#define RX_PIN_NUMBER  8
-#define TX_PIN_NUMBER  6
-#define CTS_PIN_NUMBER 7
-#define RTS_PIN_NUMBER 5
-#define HWFC           false
+#define RX_PIN_NUMBER      8
+#define TX_PIN_NUMBER      6
+#define CTS_PIN_NUMBER     0
+#define RTS_PIN_NUMBER     0
+#define HWFC               false
 
 // Used as model string in OTA mode
-#define DIS_MANUFACTURER  "Adafruit Industries"
-#define DIS_MODEL         "Bluefruit Feather nRF52832"
+#define DIS_MANUFACTURER   "Adafruit Industries"
+#define DIS_MODEL          "Bluefruit Feather nRF52832"
 
-#define PRODUCT_NAME      "Adafruit Bluefruit Feather nRF52832"
+#define PRODUCT_NAME       "Adafruit Bluefruit Feather nRF52832"
 
 #endif // _FEATHER52832_H
diff --git a/src/boards/feather_nrf52840_express.h b/src/boards/feather_nrf52840_express.h
index 05ecfc7..3206046 100644
--- a/src/boards/feather_nrf52840_express.h
+++ b/src/boards/feather_nrf52840_express.h
@@ -42,35 +42,35 @@
 /*------------------------------------------------------------------*/
 /* LED
  *------------------------------------------------------------------*/
-#define LEDS_NUMBER    2
-#define LED_PRIMARY_PIN           _PINNUM(1, 15)
-#define LED_SECONDARY_PIN         _PINNUM(1, 10)
-#define LED_NEOPIXEL   16
-#define BOARD_RGB_BRIGHTNESS 0x040404
-#define LED_STATE_ON   1
+#define LEDS_NUMBER           2
+#define LED_PRIMARY_PIN       _PINNUM(1, 15)
+#define LED_SECONDARY_PIN     _PINNUM(1, 10)
+#define LED_NEOPIXEL          16
+#define BOARD_RGB_BRIGHTNESS  0x040404
+#define LED_STATE_ON          1
 
 /*------------------------------------------------------------------*/
 /* BUTTON
  *------------------------------------------------------------------*/
-#define BUTTONS_NUMBER 2
-#define BUTTON_1       _PINNUM(0, 15)
-#define BUTTON_2       _PINNUM(0, 19)
-#define BUTTON_PULL    NRF_GPIO_PIN_PULLUP
+#define BUTTONS_NUMBER        2
+#define BUTTON_1              _PINNUM(0, 15)
+#define BUTTON_2              _PINNUM(0, 19)
+#define BUTTON_PULL           NRF_GPIO_PIN_PULLUP
 
 /*------------------------------------------------------------------*/
 /* UART
  *------------------------------------------------------------------*/
-#define RX_PIN_NUMBER  8
-#define TX_PIN_NUMBER  6
-#define CTS_PIN_NUMBER 7
-#define RTS_PIN_NUMBER 5
-#define HWFC           false
+#define RX_PIN_NUMBER         8
+#define TX_PIN_NUMBER         6
+#define CTS_PIN_NUMBER        0
+#define RTS_PIN_NUMBER        0
+#define HWFC                  false
 
 // Used as model string in OTA mode
-#define DIS_MANUFACTURER  "Adafruit Industries"
-#define DIS_MODEL         "Bluefruit Feather nRF52840 Express"
+#define DIS_MANUFACTURER      "Adafruit Industries"
+#define DIS_MODEL             "Bluefruit Feather nRF52840 Express"
 
-#define PRODUCT_NAME      "Adafruit Feather nRF52840 Express"
-#define VOLUME_LABEL      "FTHR840BOOT"
+#define PRODUCT_NAME          "Adafruit Feather nRF52840 Express"
+#define VOLUME_LABEL          "FTHR840BOOT"
 
 #endif // _FEATHER52840_H
diff --git a/src/boards/pca10056.h b/src/boards/pca10056.h
index c49ba36..f09cd2a 100644
--- a/src/boards/pca10056.h
+++ b/src/boards/pca10056.h
@@ -40,30 +40,30 @@
 /*------------------------------------------------------------------*/
 /* LED
  *------------------------------------------------------------------*/
-#define LEDS_NUMBER    2
-#define LED_PRIMARY_PIN    13
+#define LEDS_NUMBER         2
+#define LED_PRIMARY_PIN     13
 #define LED_SECONDARY_PIN   14
-#define LED_STATE_ON   0
+#define LED_STATE_ON        0
 
 /*------------------------------------------------------------------*/
 /* BUTTON
  *------------------------------------------------------------------*/
-#define BUTTONS_NUMBER 2
-#define BUTTON_1       11
-#define BUTTON_2       12
-#define BUTTON_PULL    NRF_GPIO_PIN_PULLUP
+#define BUTTONS_NUMBER      2
+#define BUTTON_1            11
+#define BUTTON_2            12
+#define BUTTON_PULL         NRF_GPIO_PIN_PULLUP
 
 /*------------------------------------------------------------------*/
 /* UART
  *------------------------------------------------------------------*/
-#define RX_PIN_NUMBER  8
-#define TX_PIN_NUMBER  6
-#define CTS_PIN_NUMBER 7
-#define RTS_PIN_NUMBER 5
-#define HWFC           false
+#define RX_PIN_NUMBER       8
+#define TX_PIN_NUMBER       6
+#define CTS_PIN_NUMBER      0
+#define RTS_PIN_NUMBER      0
+#define HWFC                false
 
 // Used as model string in OTA mode
-#define DIS_MANUFACTURER  "Nordic"
-#define DIS_MODEL         "PCA10056"
+#define DIS_MANUFACTURER    "Nordic"
+#define DIS_MODEL           "PCA10056"
 
 #endif // PCA10056_H
diff --git a/src/sdk_config.h b/src/sdk_config.h
index d6780ac..62cd86f 100644
--- a/src/sdk_config.h
+++ b/src/sdk_config.h
@@ -43,17 +43,19 @@
 #ifndef SDK_CONFIG_H
 #define SDK_CONFIG_H
 
+#include "boards.h"
+
 //==========================================================
 // <e> HCI_SLIP_ENABLED - hci_slip - SLIP protocol implementation used by HCI
 //==========================================================
 #define HCI_SLIP_ENABLED                   1
 
 #define HCI_UART_BAUDRATE                  UART_BAUDRATE_BAUDRATE_Baud115200
-#define HCI_UART_FLOW_CONTROL              0
-#define HCI_UART_RX_PIN                    8
-#define HCI_UART_TX_PIN                    6
-#define HCI_UART_RTS_PIN                   5
-#define HCI_UART_CTS_PIN                   7
+#define HCI_UART_FLOW_CONTROL              HWFC
+#define HCI_UART_RX_PIN                    RX_PIN_NUMBER
+#define HCI_UART_TX_PIN                    TX_PIN_NUMBER
+#define HCI_UART_CTS_PIN                   CTS_PIN_NUMBER
+#define HCI_UART_RTS_PIN                   RTS_PIN_NUMBER
 
 #define HCI_TRANSPORT_ENABLED              1
 #define HCI_MAX_PACKET_SIZE_IN_BITS        8000