Merge pull request #16414 from seeseemelk/bugfix/late-fpu

Fix Cortex-M hard faults when building with -O3 or -Ofast

cpu/cortexm_common/cortexm_init.c

@@ -70,8 +70,6 @@ CORTEXM_STATIC_INLINE void cortexm_init_misc(void)
 
 void cortexm_init(void)
 {
-    cortexm_init_fpu();
-
     /* configure the vector table location to internal flash */
 #if defined(CPU_CORE_CORTEX_M3) || defined(CPU_CORE_CORTEX_M33) || \
     defined(CPU_CORE_CORTEX_M4) || defined(CPU_CORE_CORTEX_M4F) || \

cpu/cortexm_common/vectors_cortexm.c

@@ -99,6 +99,8 @@ void reset_handler_default(void)
     uint32_t *dst;
     const uint32_t *src = &_etext;
 
+    cortexm_init_fpu();
+
 #ifdef MODULE_PUF_SRAM
     puf_sram_init((uint8_t *)&_srelocate, SEED_RAM_LEN);
 #endif