diff --git a/firmware/Makefile.inc b/firmware/Makefile.inc
index 2db9163..a0d7fa9 100644
--- a/firmware/Makefile.inc
+++ b/firmware/Makefile.inc
@@ -42,7 +42,7 @@ CPU_TYPE = cortex-$(CORTEX_TYPE)
 # Compiler settings, parameters and flags
 ##########################################################################
 
-CFLAGS  = -std=c99 -c -g -Os $(INCLUDE_PATHS) -Wall -mthumb -ffunction-sections -fdata-sections -fmessage-length=0 -mcpu=$(CPU_TYPE) -DTARGET=$(TARGET) -DRAMCODE=$(RAMCODE) -fno-builtin
+CFLAGS  = -std=c99 -c -g -Os $(INCLUDE_PATHS) -Wall -mthumb -ffunction-sections -fdata-sections -fmessage-length=0 -mcpu=$(CPU_TYPE) -DTARGET=$(TARGET) -DRAMCODE=$(RAMCODE) -fno-builtin -Wno-unused-function
 LDFLAGS = -nostartfiles
 
 
diff --git a/firmware/applications/final/config.c b/firmware/applications/final/config.c
index 5aecf3b..e096a8d 100644
--- a/firmware/applications/final/config.c
+++ b/firmware/applications/final/config.c
@@ -8,6 +8,7 @@
 #include "lcd/display.h"
 
 #include "filesystem/ff.h"
+#include "filesystem/execute.h"
 
 #include <string.h>
 
diff --git a/firmware/applications/final/flame_rgb.c b/firmware/applications/final/flame_rgb.c
index 3ea22e1..fc17301 100644
--- a/firmware/applications/final/flame_rgb.c
+++ b/firmware/applications/final/flame_rgb.c
@@ -189,7 +189,7 @@ void init_flame_rgb(void) {
 
     flameRGBSetI2C(FLAME_I2C_CR_GRPPWM, 0x00); // overall dimming
 
-    rgbDataSize = readTextFile("FLAME.RGB", rgbData, 24);
+    rgbDataSize = readTextFile("FLAME.RGB", (char *)rgbData, 24);
 
     enableConfig(CFG_TYPE_FLAME,1);
 }
diff --git a/firmware/basic/config.c b/firmware/basic/config.c
index f933b52..fa58120 100644
--- a/firmware/basic/config.c
+++ b/firmware/basic/config.c
@@ -3,6 +3,7 @@
 
 #include "lcd/display.h"
 #include "lcd/print.h"
+#include "lcd/backlight.h"
 #include "filesystem/ff.h"
 #include "basic/random.h"
 #include "basic/config.h"
diff --git a/firmware/filesystem/execute.c b/firmware/filesystem/execute.c
index 7546e74..8111e8e 100644
--- a/firmware/filesystem/execute.c
+++ b/firmware/filesystem/execute.c
@@ -89,7 +89,7 @@ uint8_t execute_file (const char * fname){
 
 /**************************************************************************/
 
-void executeSelect(char *ext){
+void executeSelect(const char *ext){
     char filename[15];
     filename[0]='0';
     filename[1]=':';
diff --git a/firmware/filesystem/execute.h b/firmware/filesystem/execute.h
index 50a9a53..f421664 100644
--- a/firmware/filesystem/execute.h
+++ b/firmware/filesystem/execute.h
@@ -2,6 +2,6 @@
 #define _EXECUTE_H_
 
 uint8_t execute_file (const char * fname);
-void executeSelect(char *ext);
+void executeSelect(const char *ext);
 
 #endif
diff --git a/firmware/filesystem/select.c b/firmware/filesystem/select.c
index d6512b6..07399f1 100644
--- a/firmware/filesystem/select.c
+++ b/firmware/filesystem/select.c
@@ -8,7 +8,7 @@
 
 #define FLEN 13
 
-int getFiles(char files[][FLEN], uint8_t count, uint16_t skip, char *ext)
+int getFiles(char files[][FLEN], uint8_t count, uint16_t skip, const char *ext)
 {
     DIR dir;                /* Directory object */
     FILINFO Finfo;
@@ -45,7 +45,7 @@ int getFiles(char files[][FLEN], uint8_t count, uint16_t skip, char *ext)
 }
 
 #define PERPAGE 7
-int selectFile(char *filename, char *extension)
+int selectFile(char *filename, const char *extension)
 {
     int skip = 0;
     char key;
diff --git a/firmware/filesystem/select.h b/firmware/filesystem/select.h
index 966d135..8347840 100644
--- a/firmware/filesystem/select.h
+++ b/firmware/filesystem/select.h
@@ -4,7 +4,7 @@
 
 #define FLEN 13
 
-int getFiles(char files[][FLEN], uint8_t count, uint16_t skip, char *ext);
-int selectFile(char *filename, char *extension);
+int getFiles(char files[][FLEN], uint8_t count, uint16_t skip, const char *ext);
+int selectFile(char *filename, const char *extension);
 
 #endif
diff --git a/firmware/filesystem/util.c b/firmware/filesystem/util.c
index d0d7244..f4ace01 100644
--- a/firmware/filesystem/util.c
+++ b/firmware/filesystem/util.c
@@ -1,5 +1,9 @@
 #include <sysdefs.h>
 #include <ff.h>
+#include <string.h>
+#include "at45db041d.h"
+#include "lcd/print.h"
+#include "usb/usbmsc.h"
 
 FATFS FatFs;          /* File system object for logical drive */
 
@@ -29,10 +33,9 @@ const uint8_t init2[] = {0x80, 0x00, 0x29, 0x37,
                    0x4d, 0x45, 0x20, 0x20, 0x20, 0x20, 0x46, 0x41,
                    0x54, 0x20, 0x20, 0x20, 0x20, 0x20};
 
-inline void format_formatDF(void)
-{
+inline void format_formatDF(void) {
 	int i;
-	char buf[512];
+	BYTE buf[512];
 
     memset(buf, 0, 512);
     for(i=0; i<100; i++) dataflash_write(buf, i, 1);
diff --git a/firmware/funk/openbeacon.c b/firmware/funk/openbeacon.c
index e634f91..3ee67bc 100644
--- a/firmware/funk/openbeacon.c
+++ b/firmware/funk/openbeacon.c
@@ -1,4 +1,5 @@
 #include <stdint.h>
+#include <string.h>
 #include "funk/openbeacon.h"
 #include "funk/nrf24l01p.h"
 #include "basic/byteorder.h"
@@ -6,6 +7,7 @@
 #include "filesystem/ff.h"
 #include "basic/uuid.h"
 #include "basic/config.h"
+#include "basic/random.h"
 
 #include "SECRETS"
 
diff --git a/firmware/lcd/display.c b/firmware/lcd/display.c
index 5824c7c..2e60e08 100644
--- a/firmware/lcd/display.c
+++ b/firmware/lcd/display.c
@@ -270,7 +270,7 @@ void lcdDisplay(void) {
       unsigned char br=0xFF, bg=0xFF, bb=0xFF;
       unsigned char frame_r=0x00, frame_g=0x00, frame_b=0x80;
       uint16_t color,framecolor,backcolor;
-      uint16_t x,y,i;
+      uint16_t x,y;
       bool px;
       uint16_t actualcolor;
       color = ((r&0xF8) << 8) | ((g&0xFC)<<3) | ((b&0xF8) >> 3);