doc/sk: add script to check the different captions

doc/sk/check_caption.py

@@ -0,0 +1,25 @@
+
+# Use this script with DEBUG_CAPTION enabled in cflags
+
+captions = []
+
+with open("/tmp/caption_dump.hex", "rb") as f:
+    byte = f.read(4)
+    while byte != b"":
+        caption = b"GA94"
+        while byte != b"":
+            pos = f.tell()
+            marker = f.read(4)
+            if marker == b"GA94":
+                break
+            f.seek(pos)
+            byte = f.read(1)
+            caption += byte
+        print(" - GA94 detected, size = {}", len(caption))
+        captions.append(caption)
+
+print("There are {} captions".format(len(captions)))
+
+
+for caption in captions:
+    print( '-:' + ''.join('%02X'%(c) for c in caption))