diff --git a/radio/src/definitions.h b/radio/src/definitions.h
index 52b4e2096..32e447a18 100644
--- a/radio/src/definitions.h
+++ b/radio/src/definitions.h
@@ -61,6 +61,12 @@
   #define __DMA               __ALIGNED(4)
 #endif
 
+#if defined(CCMRAM) && !defined(SIMU)
+  #define __CCMRAM  __attribute__((section(".ccm"), aligned(4)))
+#else
+  #define __CCMRAM
+#endif
+
 #if defined(SDRAM) && !defined(SIMU)
   #define __SDRAM   __attribute__((section(".sdram"), aligned(4)))
   #define __NOINIT  __attribute__((section(".noinit")))
diff --git a/radio/src/rtos.h b/radio/src/rtos.h
index e4bd1aae7..d21094eef 100644
--- a/radio/src/rtos.h
+++ b/radio/src/rtos.h
@@ -296,7 +296,8 @@ template<int SIZE>
     return (RTOS_GET_TIME() * RTOS_MS_PER_TICK);
   }
 
-  #define RTOS_DEFINE_STACK(name, size) TaskStack<size> __ALIGNED(8) name // stack must be aligned to 8 bytes otherwise printf for %f does not work!
+  // stack must be aligned to 8 bytes otherwise printf for %f does not work!
+  #define RTOS_DEFINE_STACK(name, size) TaskStack<size> __ALIGNED(8) name __CCMRAM
 
   #define TASK_FUNCTION(task)           void task(void * pdata)
   #define TASK_RETURN()                 return
diff --git a/radio/src/targets/horus/CMakeLists.txt b/radio/src/targets/horus/CMakeLists.txt
index c8f09b868..0d5379256 100644
--- a/radio/src/targets/horus/CMakeLists.txt
+++ b/radio/src/targets/horus/CMakeLists.txt
@@ -155,11 +155,12 @@ set(RADIO_DEPENDENCIES
 
 set(FIRMWARE_DEPENDENCIES datacopy)
 
-add_definitions(-DPCBHORUS -DSTM32F429_439xx -DSDRAM -DCOLORLCD -DHARDWARE_KEYS)
+add_definitions(-DPCBHORUS -DSTM32F429_439xx -DSDRAM -DCCMRAM -DCOLORLCD -DHARDWARE_KEYS)
 add_definitions(-DEEPROM_VARIANT=0 -DAUDIO -DVOICE -DRTCLOCK)
 add_definitions(-DGPS_USART_BAUDRATE=${INTERNAL_GPS_BAUDRATE})
 add_definitions(-DPWR_BUTTON_${PWR_BUTTON})
 add_definitions(-DHARDWARE_TRAINER_JACK)
+
 set(SDRAM ON)
 
 if(DEFAULT_THEME)
diff --git a/radio/src/targets/horus/stm32f4_flash_bootloader.ld b/radio/src/targets/horus/stm32f4_flash_bootloader.ld
index afe81d1e0..d8f55855a 100644
--- a/radio/src/targets/horus/stm32f4_flash_bootloader.ld
+++ b/radio/src/targets/horus/stm32f4_flash_bootloader.ld
@@ -105,6 +105,16 @@ SECTIONS
     PROVIDE_HIDDEN (__fini_array_end = .);
   } >FLASH
 
+  .ccm_ram (NOLOAD) :
+  {
+    . = ALIGN(4);
+    _sccm_ram = .;
+    *(.ccm)
+    . = ALIGN(4);
+    . = . + _Main_Stack_Size;
+    _eccm_ram = .;
+  } >CCM
+
   /* used by the startup to initialize data */
   _sidata = .;
 
@@ -140,7 +150,7 @@ SECTIONS
     *(.noinit)
   } >RAM
 
-  /* collect all uninitialized .ccm sections */
+  /* collect all uninitialized .ram sections */
   .ram (NOLOAD) :
   {
     . = ALIGN(4);
@@ -153,7 +163,6 @@ SECTIONS
   {
     . = ALIGN(4);
     . = . + _Min_Heap_Size;
-    . = . + _Main_Stack_Size;
     . = ALIGN(4);
   } >RAM