otbox.py: when flashing binary files only check CCA region is not overwritten

Author: fjmolinas

otbox.py

@@ -46,6 +46,10 @@
 
 IMAGE_THREAD_NAME       = 'image_thread'
 HEARTBEAT_THREAD_NAME   = 'heartbeat_thread'
+
+OPENMOTE_B_FLASHSIZE = 512*1024
+CC2538_FLASHPAGE_SIZE = 2048
+
 #============================ classes =========================================
 
 def _getThreadsName():
@@ -90,27 +94,45 @@ def bootload_mote(self, serialport, firmware_file):
 
         bootloader_backdoor_enabled   = False
         extended_linear_address_found = False
-        
-        # make sure bootloader backdoor is configured correctly
-        with open(firmware_file,'r') as f:
-            for line in f:
-                
-                # looking for data at address 0027FFD4
-                # refer to: https://en.wikipedia.org/wiki/Intel_HEX#Record_types
-                
-                # looking for upper 16bit address 0027
-                if len(line)>=15 and line[:15] == ':020000040027D3':
-                    extended_linear_address_found = True
-                    
-                # check the lower 16bit address FFD4
-                
-                # | 1:3 byte count | 3:7 address | 9:17 32-bit field of the lock bit page (the last byte is backdoor configuration) |
-                # 'F6' = 111        1                               0           110
-                #        reserved   backdoor and bootloader enable  active low  PA pin used for backdoor enabling (PA6)
-                if len(line)>=17 and extended_linear_address_found and line[3:7] == 'FFD4' and int(line[1:3], 16)>4  and line[9:17] == 'FFFFFFF6':
-                    bootloader_backdoor_enabled = True
-                    break
-        
+
+        # When building RIOT with OpenWSN-fw + SUIT the Customer
+        # Configuration Area (CCA) is not touched. The Customer
+        # CCA holds the Bootloader Backdoor Configuration,
+        # Application Entry Point, flashpage lock bits.
+        # When using SUIT + cc2538 RIOT does not touch this region so
+        # that the entry point is not changed when updating the device
+        # with new firmware (the entry point must allways be riot's
+        # bootloader).
+        # The CCA field resides in the last flashpage, for cc2538
+        # each flashpage is 2048 bytes. Only openmote-b are present
+        # in the testbed and the flashsize is allways 512Kb. Since
+        # flashing at an offset is not supported only check that the
+        # target firmware does not override the CCA region.
+        if '.bin' in image:
+            if os.path.getsize(image) < (OPENMOTE_B_FLASHSIZE) - CC2538_FLASHPAGE_SIZE:
+                bootloader_backdoor_enabled = OpenTBCmdRunner
+                bootloader_backdoor_enabled = True
+        else:
+            # make sure bootloader backdoor is configured correctly
+            with open(firmware_file,'r') as f:
+                for line in f:
+
+                    # looking for data at address 0027FFD4
+                    # refer to: https://en.wikipedia.org/wiki/Intel_HEX#Record_types
+
+                    # looking for upper 16bit address 0027
+                    if len(line)>=15 and line[:15] == ':020000040027D3':
+                        extended_linear_address_found = True
+
+                    # check the lower 16bit address FFD4
+
+                    # | 1:3 byte count | 3:7 address | 9:17 32-bit field of the lock bit page (the last byte is backdoor configuration) |
+                    # 'F6' = 111        1                               0           110
+                    #        reserved   backdoor and bootloader enable  active low  PA pin used for backdoor enabling (PA6)
+                    if len(line)>=17 and extended_linear_address_found and line[3:7] == 'FFD4' and int(line[1:3], 16)>4  and line[9:17] == 'FFFFFFF6':
+                        bootloader_backdoor_enabled = True
+                        break
+
         assert bootloader_backdoor_enabled
 
         return subprocess.Popen(