diff --git a/radio/src/strhelpers.cpp b/radio/src/strhelpers.cpp
index 3eba7a617..ba518744e 100755
--- a/radio/src/strhelpers.cpp
+++ b/radio/src/strhelpers.cpp
@@ -36,8 +36,14 @@
 
 #include "opentx.h"
 
+#if !defined(BOOT)
 const pm_char s_charTab[] PROGMEM = "_-.,";
 
+char hex2zchar(uint8_t hex)
+{
+  return (hex >= 10 ? hex-9 : 27+hex);
+}
+
 char idx2char(int8_t idx)
 {
   if (idx == 0) return ' ';
@@ -142,6 +148,7 @@ char * strcat_zchar(char * dest, char * name, uint8_t size, const char *defaultN
   return &dest[len];
 }
 #endif
+#endif
 
 #if defined(CPUARM) || defined(SDCARD)
 char * strAppend(char * dest, const char * source)
diff --git a/radio/src/targets/taranis/STM32F2xx_StdPeriph_Lib_V1.1.0/Libraries/CMSIS/Device/ST/STM32F2xx/Source/Templates/gcc_ride7/startup_stm32f2xx.s b/radio/src/targets/taranis/STM32F2xx_StdPeriph_Lib_V1.1.0/Libraries/CMSIS/Device/ST/STM32F2xx/Source/Templates/gcc_ride7/startup_stm32f2xx.s
index 65757dd85..cccf3f7a6 100644
--- a/radio/src/targets/taranis/STM32F2xx_StdPeriph_Lib_V1.1.0/Libraries/CMSIS/Device/ST/STM32F2xx/Source/Templates/gcc_ride7/startup_stm32f2xx.s
+++ b/radio/src/targets/taranis/STM32F2xx_StdPeriph_Lib_V1.1.0/Libraries/CMSIS/Device/ST/STM32F2xx/Source/Templates/gcc_ride7/startup_stm32f2xx.s
@@ -99,7 +99,9 @@ LoopFillZerobss:
   cmp  r2, r3
   bcc  FillZerobss
 /* Call the clock system intitialization function.*/
-  bl  SystemInit   
+  bl  SystemInit
+/* Call C++ constructors for static objects */
+  bl  __libc_init_array
 /* Call the application's entry point.*/
   bl  main
   bx  lr