[CM7] Enable I-Cache and D-Cache

To disable use of I-Cache, define 'I_CACHE_DISABLED'
To disable use of D-Cache, define 'D_CACHE_DISABLED'

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

cores/arduino/main.cpp

@@ -33,6 +33,15 @@ void initVariant() { }
 // Required by FreeRTOS, see http://www.freertos.org/RTOS-Cortex-M3-M4.html
 #ifdef NVIC_PRIORITYGROUP_4
   HAL_NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);
+#endif
+#if (__CORTEX_M == 0x07U)
+// Defined in CMSIS core_cm7.h
+#ifndef I_CACHE_DISABLED
+  SCB_EnableICache();
+#endif
+#ifndef D_CACHE_DISABLED
+  SCB_EnableDCache();
+#endif
 #endif
 
   init();