binman: Support reading an image into an Image object

It is possible to read an Image, locate its FDT map and then read it into
the binman data structures. This allows full access to the entries that
were written to the image. Add support for this.

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

tools/binman/entry.py

@@ -162,6 +162,11 @@ class Entry(object):
         self.orig_offset = self.offset
         self.orig_size = self.size
 
+        # These should not be set in input files, but are set in an FDT map,
+        # which is also read by this code.
+        self.image_pos = fdt_util.GetInt(self._node, 'image-pos')
+        self.uncomp_size = fdt_util.GetInt(self._node, 'uncomp-size')
+
         self.align = fdt_util.GetInt(self._node, 'align')
         if tools.NotPowerOfTwo(self.align):
             raise ValueError("Node '%s': Alignment %s must be a power of two" %