diff --git a/tools/binman/etype/blob_dtb.py b/tools/binman/etype/blob_dtb.py
index a3b548eef2..5b559967d7 100644
--- a/tools/binman/etype/blob_dtb.py
+++ b/tools/binman/etype/blob_dtb.py
@@ -53,3 +53,12 @@ class Entry_blob_dtb(Entry_blob):
         """
         fname = self.GetDefaultFilename()
         return {self.GetFdtEtype(): [self, fname]}
+
+    def WriteData(self, data, decomp=True):
+        ok = Entry_blob.WriteData(self, data, decomp)
+
+        # Update the state module, since it has the authoritative record of the
+        # device trees used. If we don't do this, then state.GetFdtContents()
+        # will still return the old contents
+        state.UpdateFdtContents(self.GetFdtEtype(), data)
+        return ok
diff --git a/tools/binman/state.py b/tools/binman/state.py
index f22cc82d87..d704ed2c7c 100644
--- a/tools/binman/state.py
+++ b/tools/binman/state.py
@@ -108,6 +108,22 @@ def GetFdtContents(etype='u-boot-dtb'):
         data = tools.ReadFile(pathname)
     return pathname, data
 
+def UpdateFdtContents(etype, data):
+    """Update the contents of a particular device tree
+
+    The device tree is updated and written back to its file. This affects what
+    is returned from future called to GetFdtContents(), etc.
+
+    Args:
+        etype: Entry type (e.g. 'u-boot-dtb')
+        data: Data to replace the DTB with
+    """
+    dtb, fname, entry = output_fdt_info[etype]
+    dtb_fname = dtb.GetFilename()
+    tools.WriteFile(dtb_fname, data)
+    dtb = fdt.FdtScan(dtb_fname)
+    output_fdt_info[etype] = [dtb, fname, entry]
+
 def SetEntryArgs(args):
     """Set the value of the entry args
 
diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py
index cd7673c7da..6770be79fb 100644
--- a/tools/dtoc/fdt.py
+++ b/tools/dtoc/fdt.py
@@ -695,6 +695,14 @@ class Fdt:
         node = Node(fdt, parent, offset, name, path)
         return node
 
+    def GetFilename(self):
+        """Get the filename of the device tree
+
+        Returns:
+            String filename
+        """
+        return self._fname
+
 def FdtScan(fname):
     """Returns a new Fdt object"""
     dtb = Fdt(fname)
diff --git a/tools/dtoc/test_fdt.py b/tools/dtoc/test_fdt.py
index 16a4430892..028c8cbaa8 100755
--- a/tools/dtoc/test_fdt.py
+++ b/tools/dtoc/test_fdt.py
@@ -449,6 +449,11 @@ class TestProp(unittest.TestCase):
         self.assertIn("node '/spl-test': Missing property 'one'",
                       str(e.exception))
 
+    def testGetFilename(self):
+        """Test the dtb filename can be provided"""
+        self.assertEqual(tools.GetOutputFilename('source.dtb'),
+                         self.dtb.GetFilename())
+
 
 class TestFdtUtil(unittest.TestCase):
     """Tests for the fdt_util module