diff --git a/radio/src/targets/common/arm/stm32/CMakeLists.txt b/radio/src/targets/common/arm/stm32/CMakeLists.txt
index 4da98b97a..75eff65f8 100644
--- a/radio/src/targets/common/arm/stm32/CMakeLists.txt
+++ b/radio/src/targets/common/arm/stm32/CMakeLists.txt
@@ -17,6 +17,11 @@ set(STM32USB_SRC
   STM32_USB_Device_Library/Core/src/usbd_ioreq.c
   STM32_USB_Device_Library/Core/src/usbd_req.c
   )
+set(TARGET_SRC
+  ${TARGET_SRC}
+  ../common/arm/stm32/rtc_driver.cpp
+  ../common/arm/stm32/cpu_id.cpp
+  )
 set(FIRMWARE_TARGET_SRC
   ${FIRMWARE_TARGET_SRC}
   ../common/arm/stm32/delays.cpp
diff --git a/radio/src/targets/common/arm/stm32/cpu_id.cpp b/radio/src/targets/common/arm/stm32/cpu_id.cpp
new file mode 100644
index 000000000..ef8977d13
--- /dev/null
+++ b/radio/src/targets/common/arm/stm32/cpu_id.cpp
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) OpenTX
+ *
+ * Based on code named
+ *   th9x - http://code.google.com/p/th9x
+ *   er9x - http://code.google.com/p/er9x
+ *   gruvin9x - http://code.google.com/p/gruvin9x
+ *
+ * License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include "opentx.h"
+
+void getCPUUniqueID(char * s)
+{
+#if defined(SIMU)
+  uint32_t cpu_uid[3] = { 0x12345678, 0x55AA55AA, 0x87654321};
+#else
+  uint32_t * cpu_uid = (uint32_t *)0x1FFF7A10;
+#endif
+  char * tmp = strAppendUnsigned(s, cpu_uid[0], 8, 16);
+  *tmp = ' ';
+  tmp = strAppendUnsigned(tmp+1, cpu_uid[1], 8, 16);
+  *tmp = ' ';
+  strAppendUnsigned(tmp+1, cpu_uid[2], 8, 16);
+}
diff --git a/radio/src/targets/horus/CMakeLists.txt b/radio/src/targets/horus/CMakeLists.txt
index 54158bcd2..e4c840d8f 100644
--- a/radio/src/targets/horus/CMakeLists.txt
+++ b/radio/src/targets/horus/CMakeLists.txt
@@ -56,7 +56,6 @@ set(TARGET_SRC
   led_driver.cpp
   extmodule_driver.cpp
   gps_driver.cpp
-  ../common/arm/stm32/rtc_driver.cpp
   )
 set(FIRMWARE_TARGET_SRC
   ${FIRMWARE_TARGET_SRC}
diff --git a/radio/src/targets/taranis/CMakeLists.txt b/radio/src/targets/taranis/CMakeLists.txt
index c693517fe..0b8fe0036 100644
--- a/radio/src/targets/taranis/CMakeLists.txt
+++ b/radio/src/targets/taranis/CMakeLists.txt
@@ -96,7 +96,6 @@ set(TARGET_SRC
   ${LED_DRIVER}
   backlight_driver.cpp
   extmodule_driver.cpp
-  ../common/arm/stm32/rtc_driver.cpp
   )
 
 set(FIRMWARE_SRC
diff --git a/radio/src/targets/taranis/board.cpp b/radio/src/targets/taranis/board.cpp
index 44280340e..7d3f7986f 100644
--- a/radio/src/targets/taranis/board.cpp
+++ b/radio/src/targets/taranis/board.cpp
@@ -39,20 +39,6 @@ void watchdogInit(unsigned int duration)
   IWDG->KR = 0xCCCC;      // start
 }
 
-void getCPUUniqueID(char * s)
-{
-#if defined(SIMU)
-  uint32_t cpu_uid[3] = {0x12345678, 0x55AA55AA, 0x87654321};
-#else
-  uint32_t * cpu_uid = (uint32_t *)0x1FFF7A10;
-#endif
-  char * tmp = strAppendUnsigned(s, cpu_uid[0], 8, 16);
-  *tmp = ' ';
-  tmp = strAppendUnsigned(tmp+1, cpu_uid[1], 8, 16);
-  *tmp = ' ';
-  strAppendUnsigned(tmp+1, cpu_uid[2], 8, 16);
-}
-
 // Starts TIMER at 2MHz
 void init2MhzTimer()
 {