binman: Write the original input fdtmap to a file

When reading an image in, write its fdtmap to a file in the output
directory. This is useful for debugging. Update the 'ls' command to set up
the output directory; otherwise it will fail.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/control.py

@@ -342,7 +342,11 @@ def Binman(args):
         return 0
 
     if args.cmd == 'ls':
-        ListEntries(args.image, args.paths)
+        try:
+            tools.PrepareOutputDir(None)
+            ListEntries(args.image, args.paths)
+        finally:
+            tools.FinaliseOutputDir()
         return 0
 
     if args.cmd == 'extract':