diff --git a/bsp/samd21/SAM_D2X_RTT.sct b/bsp/samd21/SAM_D2X_RTT.sct
new file mode 100644
index 0000000000000000000000000000000000000000..45489c568749553afc926b7ea6397707f0749220
--- /dev/null
+++ b/bsp/samd21/SAM_D2X_RTT.sct
@@ -0,0 +1,15 @@
+; *************************************************************
+; *** Scatter-Loading Description File generated by uVision ***
+; *************************************************************
+
+LR_IROM1 0x00000000 0x00040000  {    ; load region size_region
+  ER_IROM1 0x00000000 0x00040000  {  ; load address = execution address
+   *.o (RESET, +First)
+   *(InRoot$$Sections)
+   .ANY (+RO)
+  }
+  RW_IRAM1 0x20000000 0x00008000  {  ; RW data
+   .ANY (+RW +ZI)
+  }
+}
+
diff --git a/bsp/samd21/rtconfig.py b/bsp/samd21/rtconfig.py
index 3a4a499043666fe889ef6bcf690068c8d3f2fcd1..edd1d7358db444dda25f91e6476301a02f4654a1 100644
--- a/bsp/samd21/rtconfig.py
+++ b/bsp/samd21/rtconfig.py
@@ -71,8 +71,9 @@ elif PLATFORM == 'armcc':
     DEVICE = ' --device DARMSTM'
     CFLAGS = DEVICE + ' --apcs=interwork'
     AFLAGS = DEVICE
-    LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers --list rtthread-SAM_D2x.map --strict --scatter SAM_D2X_RTT.scf'
+    LFLAGS = DEVICE + ' --info sizes --info totals --info unused --info veneers --list rtthread-SAM_D2x.map --strict --scatter SAM_D2X_RTT.sct'
 
+    CFLAGS += ' --c99'
     CFLAGS += ' -I' + EXEC_PATH + '/ARM/RV31/INC'
     LFLAGS += ' --libpath ' + EXEC_PATH + '/ARM/RV31/LIB'