diff --git a/tools/binman/README b/tools/binman/README
index 008d575..8b598a7 100644
--- a/tools/binman/README
+++ b/tools/binman/README
@@ -462,14 +462,22 @@
 
 Image creation proceeds in the following order, for each entry in the image.
 
-1. ProcessFdt() - process the device tree information as required by the
+1. AddMissingProperties() - binman can add calculated values to the device
+tree as part of its processing, for example the position and size of each
+entry. This method adds any properties associated with this, expanding the
+device tree as needed. These properties can have placeholder values which are
+set later by SetCalculatedProperties(). By that stage the size of sections
+cannot be changed (since it would cause the images to need to be repacked),
+but the correct values can be inserted.
+
+2. ProcessFdt() - process the device tree information as required by the
 particular entry. This may involve adding or deleting properties. If the
 processing is complete, this method should return True. If the processing
 cannot complete because it needs the ProcessFdt() method of another entry to
 run first, this method should return False, in which case it will be called
 again later.
 
-2. GetEntryContents() - the contents of each entry are obtained, normally by
+3. GetEntryContents() - the contents of each entry are obtained, normally by
 reading from a file. This calls the Entry.ObtainContents() to read the
 contents. The default version of Entry.ObtainContents() calls
 Entry.GetDefaultFilename() and then reads that file. So a common mechanism
@@ -478,35 +486,38 @@
 retry calling the functions a few times if False is returned, allowing
 dependencies between the contents of different entries.
 
-3. GetEntryPositions() - calls Entry.GetPositions() for each entry. This can
+4. GetEntryPositions() - calls Entry.GetPositions() for each entry. This can
 return a dict containing entries that need updating. The key should be the
 entry name and the value is a tuple (pos, size). This allows an entry to
 provide the position and size for other entries. The default implementation
 of GetEntryPositions() returns {}.
 
-4. PackEntries() - calls Entry.Pack() which figures out the position and
+5. PackEntries() - calls Entry.Pack() which figures out the position and
 size of an entry. The 'current' image position is passed in, and the function
 returns the position immediately after the entry being packed. The default
 implementation of Pack() is usually sufficient.
 
-5. CheckSize() - checks that the contents of all the entries fits within
+6. CheckSize() - checks that the contents of all the entries fits within
 the image size. If the image does not have a defined size, the size is set
 large enough to hold all the entries.
 
-6. CheckEntries() - checks that the entries do not overlap, nor extend
+7. CheckEntries() - checks that the entries do not overlap, nor extend
 outside the image.
 
-7. ProcessEntryContents() - this calls Entry.ProcessContents() on each entry.
+8. SetCalculatedProperties() - update any calculated properties in the device
+tree. This sets the correct 'pos' and 'size' vaues, for example.
+
+9. ProcessEntryContents() - this calls Entry.ProcessContents() on each entry.
 The default implementatoin does nothing. This can be overriden to adjust the
 contents of an entry in some way. For example, it would be possible to create
 an entry containing a hash of the contents of some other entries. At this
 stage the position and size of entries should not be adjusted.
 
-8. WriteSymbols() - write the value of symbols into the U-Boot SPL binary.
+10. WriteSymbols() - write the value of symbols into the U-Boot SPL binary.
 See 'Access to binman entry positions at run time' below for a description of
 what happens in this stage.
 
-9. BuildImage() - builds the image and writes it to a file. This is the final
+11. BuildImage() - builds the image and writes it to a file. This is the final
 step.
 
 
diff --git a/tools/binman/bsection.py b/tools/binman/bsection.py
index 3ed361d..de439ef 100644
--- a/tools/binman/bsection.py
+++ b/tools/binman/bsection.py
@@ -90,6 +90,14 @@
             entry.SetPrefix(self._name_prefix)
             self._entries[node.name] = entry
 
+    def AddMissingProperties(self):
+        for entry in self._entries.values():
+            entry.AddMissingProperties()
+
+    def SetCalculatedProperties(self):
+        for entry in self._entries.values():
+            entry.SetCalculatedProperties()
+
     def ProcessFdt(self, fdt):
         todo = self._entries.values()
         for passnum in range(3):
diff --git a/tools/binman/cmdline.py b/tools/binman/cmdline.py
index bf63919..ae2d167 100644
--- a/tools/binman/cmdline.py
+++ b/tools/binman/cmdline.py
@@ -42,6 +42,8 @@
                     default=False, help='run tests')
     parser.add_option('-T', '--test-coverage', action='store_true',
                     default=False, help='run tests and check for 100% coverage')
+    parser.add_option('-u', '--update-fdt', action='store_true',
+        default=False, help='Update the binman node with position/size info')
     parser.add_option('-v', '--verbosity', default=1,
         type='int', help='Control verbosity: 0=silent, 1=progress, 3=full, '
         '4=debug')
diff --git a/tools/binman/control.py b/tools/binman/control.py
index 5325a6a..eafabf0 100644
--- a/tools/binman/control.py
+++ b/tools/binman/control.py
@@ -144,6 +144,8 @@
             # without changing the device-tree size, thus ensuring that our
             # entry positions remain the same.
             for image in images.values():
+                if options.update_fdt:
+                    image.AddMissingProperties()
                 image.ProcessFdt(dtb)
 
             dtb.Pack()
@@ -159,6 +161,8 @@
                 image.PackEntries()
                 image.CheckSize()
                 image.CheckEntries()
+                if options.update_fdt:
+                    image.SetCalculatedProperties()
                 image.ProcessEntryContents()
                 image.WriteSymbols()
                 image.BuildImage()
diff --git a/tools/binman/entry.py b/tools/binman/entry.py
index 62e65c9..6a173e6 100644
--- a/tools/binman/entry.py
+++ b/tools/binman/entry.py
@@ -130,6 +130,17 @@
         self.align_end = fdt_util.GetInt(self._node, 'align-end')
         self.pos_unset = fdt_util.GetBool(self._node, 'pos-unset')
 
+    def AddMissingProperties(self):
+        """Add new properties to the device tree as needed for this entry"""
+        for prop in ['pos', 'size']:
+            if not prop in self._node.props:
+                self._node.AddZeroProp(prop)
+
+    def SetCalculatedProperties(self):
+        """Set the value of device-tree properties calculated by binman"""
+        self._node.SetInt('pos', self.pos)
+        self._node.SetInt('size', self.size)
+
     def ProcessFdt(self, fdt):
         return True
 
diff --git a/tools/binman/etype/section.py b/tools/binman/etype/section.py
index 9b38738..787257d 100644
--- a/tools/binman/etype/section.py
+++ b/tools/binman/etype/section.py
@@ -20,6 +20,10 @@
     def ProcessFdt(self, fdt):
         return self._section.ProcessFdt(fdt)
 
+    def AddMissingProperties(self):
+        Entry.AddMissingProperties(self)
+        self._section.AddMissingProperties()
+
     def ObtainContents(self):
         return self._section.GetEntryContents()
 
@@ -45,6 +49,10 @@
         """Write symbol values into binary files for access at run time"""
         self._section.WriteSymbols()
 
+    def SetCalculatedProperties(self):
+        Entry.SetCalculatedProperties(self)
+        self._section.SetCalculatedProperties()
+
     def ProcessContents(self):
         self._section.ProcessEntryContents()
         super(Entry_section, self).ProcessContents()
diff --git a/tools/binman/image.py b/tools/binman/image.py
index 9732493..94028f1 100644
--- a/tools/binman/image.py
+++ b/tools/binman/image.py
@@ -54,6 +54,17 @@
             self._filename = filename
         self._section = bsection.Section('main-section', self._node)
 
+    def AddMissingProperties(self):
+        """Add properties that are not present in the device tree
+
+        When binman has completed packing the entries the position and size of
+        each entry are known. But before this the device tree may not specify
+        these. Add any missing properties, with a dummy value, so that the
+        size of the entry is correct. That way we can insert the correct values
+        later.
+        """
+        self._section.AddMissingProperties()
+
     def ProcessFdt(self, fdt):
         return self._section.ProcessFdt(fdt)
 
@@ -82,6 +93,9 @@
         """Check that entries do not overlap or extend outside the image"""
         self._section.CheckEntries()
 
+    def SetCalculatedProperties(self):
+        self._section.SetCalculatedProperties()
+
     def ProcessEntryContents(self):
         """Call the ProcessContents() method for each entry