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-rw-r--r--atmel-samd/main.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/atmel-samd/main.c b/atmel-samd/main.c
index 70c343507..3a2d5a63c 100644
--- a/atmel-samd/main.c
+++ b/atmel-samd/main.c
@@ -513,6 +513,10 @@ safe_mode_t samd21_init(void) {
REG_MTB_POSITION = ((uint32_t) (mtb - REG_MTB_BASE)) & 0xFFFFFFF8;
REG_MTB_FLOW = (((uint32_t) mtb - REG_MTB_BASE) + TRACE_BUFFER_SIZE_BYTES) & 0xFFFFFFF8;
REG_MTB_MASTER = 0x80000000 + (TRACE_BUFFER_MAGNITUDE_PACKETS - 1);
+#else
+ // Triple check that the MTB is off. Switching between debug and non-debug
+ // builds can leave it set over reset and wreak havok as a result.
+ REG_MTB_MASTER = 0x00000000 + 6;
#endif
// On power on start or external reset, set _ezero to the canary word. If it