diff --git a/Makefile b/Makefile
index 96c3f14a84..b8a9ed818a 100644
--- a/Makefile
+++ b/Makefile
@@ -1328,13 +1328,18 @@ u-boot.ldr:	u-boot
 # Use 'make BINMAN_VERBOSE=3' to set vebosity level
 default_dt := $(if $(DEVICE_TREE),$(DEVICE_TREE),$(CONFIG_DEFAULT_DEVICE_TREE))
 
+# Temporary workaround for Venice boards
+ifneq ($(CONFIG_TARGET_IMX8MM_VENICE),$(CONFIG_TARGET_IMX8MN_VENICE),$(CONFIG_TARGET_IMX8MP_VENICE),)
+ignore_dups := --ignore-dup-phandles
+endif
+
 quiet_cmd_binman = BINMAN  $@
 cmd_binman = $(srctree)/tools/binman/binman $(if $(BINMAN_DEBUG),-D) \
 		$(foreach f,$(BINMAN_TOOLPATHS),--toolpath $(f)) \
                 --toolpath $(objtree)/tools \
 		$(if $(BINMAN_VERBOSE),-v$(BINMAN_VERBOSE)) \
 		build -u -d u-boot.dtb -O . -m \
-		$(if $(BINMAN_ALLOW_MISSING),--allow-missing --ignore-missing) \
+		--allow-missing $(if $(BINMAN_ALLOW_MISSING),--ignore-missing) \
 		-I . -I $(srctree) -I $(srctree)/board/$(BOARDDIR) \
 		-I arch/$(ARCH)/dts -a of-list=$(CONFIG_OF_LIST) \
 		$(foreach f,$(BINMAN_INDIRS),-I $(f)) \
@@ -1349,6 +1354,7 @@ cmd_binman = $(srctree)/tools/binman/binman $(if $(BINMAN_DEBUG),-D) \
 		-a spl-dtb=$(CONFIG_SPL_OF_REAL) \
 		-a tpl-dtb=$(CONFIG_TPL_OF_REAL) \
 		-a pre-load-key-path=${PRE_LOAD_KEY_PATH} \
+		$(ignore_dups) \
 		$(BINMAN_$(@F))
 
 OBJCOPYFLAGS_u-boot.ldr.hex := -I binary -O ihex
diff --git a/boot/bootdev-uclass.c b/boot/bootdev-uclass.c
index 9660ff7567..3f2c8d7153 100644
--- a/boot/bootdev-uclass.c
+++ b/boot/bootdev-uclass.c
@@ -216,7 +216,7 @@ void bootdev_list(bool probe)
 	for (i = 0; dev; i++) {
 		printf("%3x   [ %c ]  %6s  %-9.9s %s\n", dev_seq(dev),
 		       device_active(dev) ? '+' : ' ',
-		       ret ? simple_itoa(ret) : "OK",
+		       ret ? simple_itoa(-ret) : "OK",
 		       dev_get_uclass_name(dev_get_parent(dev)), dev->name);
 		if (probe)
 			ret = uclass_next_device_check(&dev);
diff --git a/cmd/bootdev.c b/cmd/bootdev.c
index 5b1efaaee8..a657de6bd0 100644
--- a/cmd/bootdev.c
+++ b/cmd/bootdev.c
@@ -99,7 +99,7 @@ static int do_bootdev_info(struct cmd_tbl *cmdtp, int flag, int argc,
 
 	printf("Name:      %s\n", dev->name);
 	printf("Sequence:  %d\n", dev_seq(dev));
-	printf("Status:    %s\n", ret ? simple_itoa(ret) : device_active(dev) ?
+	printf("Status:    %s\n", ret ? simple_itoa(-ret) : device_active(dev) ?
 		"Probed" : "OK");
 	printf("Uclass:    %s\n", dev_get_uclass_name(dev_get_parent(dev)));
 	printf("Bootflows: %d (%d valid)\n", i, num_valid);
diff --git a/tools/binman/binman.rst b/tools/binman/binman.rst
index 8f57b6cfc7..aeea33fddb 100644
--- a/tools/binman/binman.rst
+++ b/tools/binman/binman.rst
@@ -1256,8 +1256,32 @@ Properties in the template node are inserted into the destination node if they
 do not exist there. In the example above, `some-property` is added to each of
 `spi-image` and `mmc-image`.
 
-Note that template nodes are not removed from the binman description at present.
+Note that template nodes are removed from the binman description after
+processing and before binman builds the image descriptions.
 
+The initial devicetree produced by the templating process is written to the
+`u-boot.dtb.tmpl1` file. This can be useful to see what is going on if there is
+a failure before the final `u-boot.dtb.out` file is written. A second
+`u-boot.dtb.tmpl2` file is written when the templates themselves are removed.
+
+Dealing with phandles
+---------------------
+
+Templates can contain phandles and these are copied to the destination node.
+However this should be used with care, since if a template is instantiated twice
+then the phandle will be copied twice, resulting in a devicetree with duplicate
+phandles, i.e. the same phandle used by two different nodes. Binman detects this
+situation and produces an error, for example::
+
+  Duplicate phandle 1 in nodes /binman/image/fit/images/atf/atf-bl31 and
+  /binman/image-2/fit/images/atf/atf-bl31
+
+In this case an atf-bl31 node containing a phandle has been copied into two
+different target nodes, resulting in the same phandle for each. See
+testTemplatePhandleDup() for the test case.
+
+The solution is typically to put the phandles in the corresponding target nodes
+(one for each) and remove the phandle from the template.
 
 Updating an ELF file
 ====================
diff --git a/tools/binman/cmdline.py b/tools/binman/cmdline.py
index 9632ec115e..39c61c2c03 100644
--- a/tools/binman/cmdline.py
+++ b/tools/binman/cmdline.py
@@ -126,6 +126,8 @@ controlled by a description in the board device tree.'''
             help='Comma-separated list of bintools to consider missing (for testing)')
     build_parser.add_argument('-i', '--image', type=str, action='append',
             help='Image filename to build (if not specified, build all)')
+    build_parser.add_argument('--ignore-dup-phandles', action='store_true',
+            help='Temporary option to ignore duplicate phandles')
     build_parser.add_argument('-I', '--indir', action='append',
             help='Add a path to the list of directories to use for input files')
     build_parser.add_argument('-m', '--map', action='store_true',
diff --git a/tools/binman/control.py b/tools/binman/control.py
index d1ee1d69a9..4594895581 100644
--- a/tools/binman/control.py
+++ b/tools/binman/control.py
@@ -22,6 +22,7 @@ from binman import bintool
 from binman import cbfs_util
 from binman import elf
 from binman import entry
+from dtoc import fdt
 from dtoc import fdt_util
 from u_boot_pylib import command
 from u_boot_pylib import tools
@@ -57,7 +58,7 @@ def _ReadImageDesc(binman_node, use_expanded):
     images = OrderedDict()
     if 'multiple-images' in binman_node.props:
         for node in binman_node.subnodes:
-            if 'template' not in node.name:
+            if not node.name.startswith('template'):
                 images[node.name] = Image(node.name, node,
                                           use_expanded=use_expanded)
     else:
@@ -112,12 +113,13 @@ def _ReadMissingBlobHelp():
     _FinishTag(tag, msg, result)
     return result
 
-def _ShowBlobHelp(path, text):
-    tout.warning('\n%s:' % path)
+def _ShowBlobHelp(level, path, text, fname):
+    tout.do_output(level, '%s (%s):' % (path, fname))
     for line in text.splitlines():
-        tout.warning('   %s' % line)
+        tout.do_output(level, '   %s' % line)
+    tout.do_output(level, '')
 
-def _ShowHelpForMissingBlobs(missing_list):
+def _ShowHelpForMissingBlobs(level, missing_list):
     """Show help for each missing blob to help the user take action
 
     Args:
@@ -132,10 +134,17 @@ def _ShowHelpForMissingBlobs(missing_list):
         tags = entry.GetHelpTags()
 
         # Show the first match help message
+        shown_help = False
         for tag in tags:
             if tag in missing_blob_help:
-                _ShowBlobHelp(entry._node.path, missing_blob_help[tag])
+                _ShowBlobHelp(level, entry._node.path, missing_blob_help[tag],
+                              entry.GetDefaultFilename())
+                shown_help = True
                 break
+        # Or a generic help message
+        if not shown_help:
+            _ShowBlobHelp(level, entry._node.path, "Missing blob",
+                          entry.GetDefaultFilename())
 
 def GetEntryModules(include_testing=True):
     """Get a set of entry class implementations
@@ -486,6 +495,9 @@ def _ProcessTemplates(parent):
     Args:
         parent: Binman node to process (typically /binman)
 
+    Returns:
+        bool: True if any templates were processed
+
     Search though each target node looking for those with an 'insert-template'
     property. Use that as a list of references to template nodes to use to
     adjust the target node.
@@ -498,11 +510,22 @@ def _ProcessTemplates(parent):
 
     See 'Templates' in the Binman documnentation for details.
     """
+    found = False
     for node in parent.subnodes:
         tmpl = fdt_util.GetPhandleList(node, 'insert-template')
         if tmpl:
             node.copy_subnodes_from_phandles(tmpl)
-        _ProcessTemplates(node)
+            found = True
+
+        found |= _ProcessTemplates(node)
+    return found
+
+def _RemoveTemplates(parent):
+    """Remove any templates in the binman description
+    """
+    for node in parent.subnodes:
+        if node.name.startswith('template'):
+            node.Delete()
 
 def PrepareImagesAndDtbs(dtb_fname, select_images, update_fdt, use_expanded):
     """Prepare the images to be processed and select the device tree
@@ -546,7 +569,19 @@ def PrepareImagesAndDtbs(dtb_fname, select_images, update_fdt, use_expanded):
         raise ValueError("Device tree '%s' does not have a 'binman' "
                             "node" % dtb_fname)
 
-    _ProcessTemplates(node)
+    if _ProcessTemplates(node):
+        dtb.Sync(True)
+        fname = tools.get_output_filename('u-boot.dtb.tmpl1')
+        tools.write_file(fname, dtb.GetContents())
+
+        _RemoveTemplates(node)
+        dtb.Sync(True)
+
+        # Rescan the dtb to pick up the new phandles
+        dtb.Scan()
+        node = _FindBinmanNode(dtb)
+        fname = tools.get_output_filename('u-boot.dtb.tmpl2')
+        tools.write_file(fname, dtb.GetContents())
 
     images = _ReadImageDesc(node, use_expanded)
 
@@ -658,15 +693,15 @@ def ProcessImage(image, update_fdt, write_map, get_contents=True,
     missing_list = []
     image.CheckMissing(missing_list)
     if missing_list:
-        tout.warning("Image '%s' is missing external blobs and is non-functional: %s" %
-                     (image.name, ' '.join([e.name for e in missing_list])))
-        _ShowHelpForMissingBlobs(missing_list)
+        tout.error("Image '%s' is missing external blobs and is non-functional: %s\n" %
+                   (image.name, ' '.join([e.name for e in missing_list])))
+        _ShowHelpForMissingBlobs(tout.ERROR, missing_list)
 
     faked_list = []
     image.CheckFakedBlobs(faked_list)
     if faked_list:
         tout.warning(
-            "Image '%s' has faked external blobs and is non-functional: %s" %
+            "Image '%s' has faked external blobs and is non-functional: %s\n" %
             (image.name, ' '.join([os.path.basename(e.GetDefaultFilename())
                                    for e in faked_list])))
 
@@ -674,15 +709,15 @@ def ProcessImage(image, update_fdt, write_map, get_contents=True,
     image.CheckOptional(optional_list)
     if optional_list:
         tout.warning(
-            "Image '%s' is missing external blobs but is still functional: %s" %
+            "Image '%s' is missing optional external blobs but is still functional: %s\n" %
             (image.name, ' '.join([e.name for e in optional_list])))
-        _ShowHelpForMissingBlobs(optional_list)
+        _ShowHelpForMissingBlobs(tout.WARNING, optional_list)
 
     missing_bintool_list = []
     image.check_missing_bintools(missing_bintool_list)
     if missing_bintool_list:
         tout.warning(
-            "Image '%s' has missing bintools and is non-functional: %s" %
+            "Image '%s' has missing bintools and is non-functional: %s\n" %
             (image.name, ' '.join([os.path.basename(bintool.name)
                                    for bintool in missing_bintool_list])))
     return any([missing_list, faked_list, missing_bintool_list])
@@ -782,6 +817,10 @@ def Binman(args):
         cbfs_util.VERBOSE = args.verbosity > 2
         state.use_fake_dtb = args.fake_dtb
 
+        # Temporary hack
+        if args.ignore_dup_phandles: # pragma: no cover
+            fdt.IGNORE_DUP_PHANDLES = True
+
         # Normally we replace the 'u-boot' etype with 'u-boot-expanded', etc.
         # When running tests this can be disabled using this flag. When not
         # updating the FDT in image, it is not needed by binman, but we use it
@@ -827,7 +866,7 @@ def Binman(args):
             # This can only be True if -M is provided, since otherwise binman
             # would have raised an error already
             if invalid:
-                msg = '\nSome images are invalid'
+                msg = 'Some images are invalid'
                 if args.ignore_missing:
                     tout.warning(msg)
                 else:
diff --git a/tools/binman/elf.py b/tools/binman/elf.py
index 4219001fea..2ecc95f7eb 100644
--- a/tools/binman/elf.py
+++ b/tools/binman/elf.py
@@ -447,13 +447,15 @@ def DecodeElf(data, location):
     Returns:
         ElfInfo object containing information about the decoded ELF file
     """
+    if not ELF_TOOLS:
+        raise ValueError("Python: No module named 'elftools'")
     file_size = len(data)
     with io.BytesIO(data) as fd:
         elf = ELFFile(fd)
-        data_start = 0xffffffff;
-        data_end = 0;
-        mem_end = 0;
-        virt_to_phys = 0;
+        data_start = 0xffffffff
+        data_end = 0
+        mem_end = 0
+        virt_to_phys = 0
 
         for i in range(elf.num_segments()):
             segment = elf.get_segment(i)
diff --git a/tools/binman/elf_test.py b/tools/binman/elf_test.py
index cc95b424b3..e3dee79d06 100644
--- a/tools/binman/elf_test.py
+++ b/tools/binman/elf_test.py
@@ -255,8 +255,20 @@ class TestElf(unittest.TestCase):
             fname = self.ElfTestFile('embed_data')
             with self.assertRaises(ValueError) as e:
                 elf.GetSymbolFileOffset(fname, ['embed_start', 'embed_end'])
-            self.assertIn("Python: No module named 'elftools'",
-                      str(e.exception))
+            with self.assertRaises(ValueError) as e:
+                elf.DecodeElf(tools.read_file(fname), 0xdeadbeef)
+            with self.assertRaises(ValueError) as e:
+                elf.GetFileOffset(fname, 0xdeadbeef)
+            with self.assertRaises(ValueError) as e:
+                elf.GetSymbolFromAddress(fname, 0xdeadbeef)
+            with self.assertRaises(ValueError) as e:
+                entry = FakeEntry(10)
+                section = FakeSection()
+                elf.LookupAndWriteSymbols(fname, entry, section, True)
+
+            self.assertIn(
+                "Section 'section_path': entry 'entry_path': Cannot write symbols to an ELF file without Python elftools",
+                str(e.exception))
         finally:
             elf.ELF_TOOLS = old_val
 
diff --git a/tools/binman/etype/fit.py b/tools/binman/etype/fit.py
index ef4d066757..2c14b15b03 100644
--- a/tools/binman/etype/fit.py
+++ b/tools/binman/etype/fit.py
@@ -842,6 +842,13 @@ class Entry_fit(Entry_section):
         for entry in self._priv_entries.values():
             entry.CheckMissing(missing_list)
 
+    def CheckOptional(self, optional_list):
+        # We must use our private entry list for this since generator nodes
+        # which are removed from self._entries will otherwise not show up as
+        # optional
+        for entry in self._priv_entries.values():
+            entry.CheckOptional(optional_list)
+
     def CheckEntries(self):
         pass
 
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index 1cfa349d38..36428ec343 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -3806,6 +3806,7 @@ class TestFunctional(unittest.TestCase):
                                    allow_missing=True)
         self.assertEqual(103, ret)
         err = stderr.getvalue()
+        self.assertIn('(missing-file)', err)
         self.assertRegex(err, "Image 'image'.*missing.*: blob-ext")
         self.assertIn('Some images are invalid', err)
 
@@ -3816,6 +3817,7 @@ class TestFunctional(unittest.TestCase):
                                    allow_missing=True, ignore_missing=True)
         self.assertEqual(0, ret)
         err = stderr.getvalue()
+        self.assertIn('(missing-file)', err)
         self.assertRegex(err, "Image 'image'.*missing.*: blob-ext")
         self.assertIn('Some images are invalid', err)
 
@@ -6358,6 +6360,13 @@ fdt         fdtmap                Extract the devicetree blob from the fdtmap
                          fdt_util.fdt32_to_cpu(node.props['entry'].value))
         self.assertEqual(U_BOOT_DATA, node.props['data'].bytes)
 
+        with test_util.capture_sys_output() as (stdout, stderr):
+            self.checkFitTee('264_tee_os_opt_fit.dts', '')
+        err = stderr.getvalue()
+        self.assertRegex(
+            err,
+            "Image '.*' is missing optional external blobs but is still functional: tee-os")
+
     def testFitTeeOsOptionalFitBad(self):
         """Test an image with a FIT with an optional OP-TEE binary"""
         with self.assertRaises(ValueError) as exc:
@@ -6390,7 +6399,7 @@ fdt         fdtmap                Extract the devicetree blob from the fdtmap
         err = stderr.getvalue()
         self.assertRegex(
             err,
-            "Image '.*' is missing external blobs but is still functional: missing")
+            "Image '.*' is missing optional external blobs but is still functional: missing")
 
     def testSectionInner(self):
         """Test an inner section with a size"""
@@ -6853,6 +6862,22 @@ fdt         fdtmap                Extract the devicetree blob from the fdtmap
         second = U_BOOT_DATA + b'#' + VGA_DATA + U_BOOT_DTB_DATA
         self.assertEqual(U_BOOT_IMG_DATA + first + second, data)
 
+        dtb_fname1 = tools.get_output_filename('u-boot.dtb.tmpl1')
+        self.assertTrue(os.path.exists(dtb_fname1))
+        dtb = fdt.Fdt.FromData(tools.read_file(dtb_fname1))
+        dtb.Scan()
+        node1 = dtb.GetNode('/binman/template')
+        self.assertTrue(node1)
+        vga = dtb.GetNode('/binman/first/intel-vga')
+        self.assertTrue(vga)
+
+        dtb_fname2 = tools.get_output_filename('u-boot.dtb.tmpl2')
+        self.assertTrue(os.path.exists(dtb_fname2))
+        dtb2 = fdt.Fdt.FromData(tools.read_file(dtb_fname2))
+        dtb2.Scan()
+        node2 = dtb2.GetNode('/binman/template')
+        self.assertFalse(node2)
+
     def testTemplateBlobMulti(self):
         """Test using a template with 'multiple-images' enabled"""
         TestFunctional._MakeInputFile('my-blob.bin', b'blob')
@@ -6944,6 +6969,33 @@ fdt         fdtmap                Extract the devicetree blob from the fdtmap
             # Move to next
             spl_data = content[:0x18]
 
+    def testTemplatePhandle(self):
+        """Test using a template in a node containing a phandle"""
+        entry_args = {
+            'atf-bl31-path': 'bl31.elf',
+        }
+        data = self._DoReadFileDtb('291_template_phandle.dts',
+                                   entry_args=entry_args)
+        fname = tools.get_output_filename('image.bin')
+        out = tools.run('dumpimage', '-l', fname)
+
+        # We should see the FIT description and one for each of the two images
+        lines = out.splitlines()
+        descs = [line.split()[-1] for line in lines if 'escription' in line]
+        self.assertEqual(['test-desc', 'atf', 'fdt'], descs)
+
+    def testTemplatePhandleDup(self):
+        """Test using a template in a node containing a phandle"""
+        entry_args = {
+            'atf-bl31-path': 'bl31.elf',
+        }
+        with self.assertRaises(ValueError) as e:
+            self._DoReadFileDtb('292_template_phandle_dup.dts',
+                                entry_args=entry_args)
+        self.assertIn(
+            'Duplicate phandle 1 in nodes /binman/image/fit/images/atf/atf-bl31 and /binman/image-2/fit/images/atf/atf-bl31',
+            str(e.exception))
+
     def testTIBoardConfig(self):
         """Test that a schema validated board config file can be generated"""
         data = self._DoReadFile('293_ti_board_cfg.dts')
diff --git a/tools/binman/missing-blob-help b/tools/binman/missing-blob-help
index f013367ac3..ab0023eb9f 100644
--- a/tools/binman/missing-blob-help
+++ b/tools/binman/missing-blob-help
@@ -43,7 +43,7 @@ for the external TPL binary is https://github.com/rockchip-linux/rkbin.
 
 tee-os:
 See the documentation for your board. You may need to build Open Portable
-Trusted Execution Environment (OP-TEE) with TEE=/path/to/tee.bin
+Trusted Execution Environment (OP-TEE) and build with TEE=/path/to/tee.bin
 
 opensbi:
 See the documentation for your board. The OpenSBI git repo is at
diff --git a/tools/binman/test/264_tee_os_opt_fit.dts b/tools/binman/test/264_tee_os_opt_fit.dts
index ae44b433ed..e9634d3ccd 100644
--- a/tools/binman/test/264_tee_os_opt_fit.dts
+++ b/tools/binman/test/264_tee_os_opt_fit.dts
@@ -25,6 +25,7 @@
 					fit,data;
 
 					tee-os {
+						optional;
 					};
 				};
 			};
diff --git a/tools/binman/test/291_template_phandle.dts b/tools/binman/test/291_template_phandle.dts
new file mode 100644
index 0000000000..c4ec1dd41b
--- /dev/null
+++ b/tools/binman/test/291_template_phandle.dts
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		multiple-images;
+
+		ti_spl_template: template-1 {
+			fit {
+				description = "test-desc";
+				#address-cells = <1>;
+				images {
+					atf {
+						description = "atf";
+						ti-secure {
+							type = "collection";
+							content = <&atf>;
+							keyfile = "key.pem";
+						};
+						atf: atf-bl31 {
+							description = "atf";
+						};
+					};
+				};
+			};
+		};
+
+		image {
+			insert-template = <&ti_spl_template>;
+			fit {
+				images {
+					fdt-0 {
+						description = "fdt";
+						ti-secure {
+							type = "collection";
+							content = <&foo_dtb>;
+							keyfile = "key.pem";
+						};
+						foo_dtb: blob-ext {
+							filename = "vga.bin";
+						};
+					};
+				};
+			};
+		};
+	};
+};
diff --git a/tools/binman/test/292_template_phandle_dup.dts b/tools/binman/test/292_template_phandle_dup.dts
new file mode 100644
index 0000000000..dc86f06463
--- /dev/null
+++ b/tools/binman/test/292_template_phandle_dup.dts
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		multiple-images;
+
+		ti_spl_template: template-1 {
+			fit {
+				description = "test-desc";
+				#address-cells = <1>;
+				images {
+					atf {
+						description = "atf";
+						ti-secure {
+							type = "collection";
+							content = <&atf>;
+							keyfile = "key.pem";
+						};
+						atf: atf-bl31 {
+							description = "atf";
+						};
+					};
+				};
+			};
+		};
+
+		image {
+			insert-template = <&ti_spl_template>;
+			fit {
+				images {
+					fdt-0 {
+						description = "fdt";
+						ti-secure {
+							type = "collection";
+							content = <&foo_dtb>;
+							keyfile = "key.pem";
+						};
+						foo_dtb: blob-ext {
+							filename = "vga.bin";
+						};
+					};
+				};
+			};
+		};
+
+		image-2 {
+			insert-template = <&ti_spl_template>;
+			fit {
+				images {
+					fdt-0 {
+						description = "fdt";
+						blob-ext {
+							filename = "vga.bin";
+						};
+					};
+				};
+			};
+		};
+	};
+};
diff --git a/tools/dtoc/fdt.py b/tools/dtoc/fdt.py
index fd0f3e94f5..0b20d52f31 100644
--- a/tools/dtoc/fdt.py
+++ b/tools/dtoc/fdt.py
@@ -15,6 +15,9 @@ from libfdt import QUIET_NOTFOUND
 from u_boot_pylib import tools
 from u_boot_pylib import tout
 
+# Temporary hack
+IGNORE_DUP_PHANDLES = False
+
 # This deals with a device tree, presenting it as an assortment of Node and
 # Prop objects, representing nodes and properties, respectively. This file
 # contains the base classes and defines the high-level API. You can use
@@ -249,6 +252,7 @@ class Prop:
         """
         if self.dirty:
             node = self._node
+            tout.debug(f'sync {node.path}: {self.name}')
             fdt_obj = node._fdt._fdt_obj
             node_name = fdt_obj.get_name(node._offset)
             if node_name and node_name != node.name:
@@ -272,6 +276,7 @@ class Prop:
         the FDT is synced
         """
         self._offset = None
+        self.dirty = True
 
 class Node:
     """A device tree node
@@ -335,7 +340,13 @@ class Node:
         self.props = self._fdt.GetProps(self)
         phandle = fdt_obj.get_phandle(self.Offset())
         if phandle:
-            self._fdt.phandle_to_node[phandle] = self
+            dup = self._fdt.phandle_to_node.get(phandle)
+            if dup:
+                if not IGNORE_DUP_PHANDLES:
+                    raise ValueError(
+                        f'Duplicate phandle {phandle} in nodes {dup.path} and {self.path}')
+            else:
+                self._fdt.phandle_to_node[phandle] = self
 
         offset = fdt_obj.first_subnode(self.Offset(), QUIET_NOTFOUND)
         while offset >= 0:
@@ -705,30 +716,38 @@ class Node:
             prop.Sync(auto_resize)
         return added
 
-    def merge_props(self, src):
+    def merge_props(self, src, copy_phandles):
         """Copy missing properties (except 'phandle') from another node
 
         Args:
             src (Node): Node containing properties to copy
+            copy_phandles (bool): True to copy phandle properties in nodes
 
         Adds properties which are present in src but not in this node. Any
         'phandle' property is not copied since this might result in two nodes
         with the same phandle, thus making phandle references ambiguous.
         """
+        tout.debug(f'copy to {self.path}: {src.path}')
         for name, src_prop in src.props.items():
-            if name != 'phandle' and name not in self.props:
-                self.props[name] = Prop(self, None, name, src_prop.bytes)
+            done = False
+            if name not in self.props:
+                if copy_phandles or name != 'phandle':
+                    self.props[name] = Prop(self, None, name, src_prop.bytes)
+                    done = True
+            tout.debug(f"  {name}{'' if done else '  - ignored'}")
 
-    def copy_node(self, src):
+    def copy_node(self, src, copy_phandles=False):
         """Copy a node and all its subnodes into this node
 
         Args:
             src (Node): Node to copy
+            copy_phandles (bool): True to copy phandle properties in nodes
 
         Returns:
             Node: Resulting destination node
 
-        This works recursively.
+        This works recursively, with copy_phandles being set to True for the
+        recursive calls
 
         The new node is put before all other nodes. If the node already
         exists, just its subnodes and properties are copied, placing them before
@@ -740,12 +759,12 @@ class Node:
             dst.move_to_first()
         else:
             dst = self.insert_subnode(src.name)
-        dst.merge_props(src)
+        dst.merge_props(src, copy_phandles)
 
         # Process in reverse order so that they appear correctly in the result,
         # since copy_node() puts the node first in the list
         for node in reversed(src.subnodes):
-            dst.copy_node(node)
+            dst.copy_node(node, True)
         return dst
 
     def copy_subnodes_from_phandles(self, phandle_list):
@@ -768,7 +787,7 @@ class Node:
                 dst = self.copy_node(node)
 
             tout.debug(f'merge props from {parent.path} to {dst.path}')
-            self.merge_props(parent)
+            self.merge_props(parent, False)
 
 
 class Fdt:
@@ -829,6 +848,7 @@ class Fdt:
 
         TODO(sjg@chromium.org): Implement the 'root' parameter
         """
+        self.phandle_to_node = {}
         self._cached_offsets = True
         self._root = self.Node(self, None, 0, '/', '/')
         self._root.Scan()
diff --git a/tools/dtoc/test/dtoc_test_copy.dts b/tools/dtoc/test/dtoc_test_copy.dts
index 36faa9b72b..8e50c75659 100644
--- a/tools/dtoc/test/dtoc_test_copy.dts
+++ b/tools/dtoc/test/dtoc_test_copy.dts
@@ -37,11 +37,12 @@
 					new-prop;
 				};
 
-				second1 {
+				second1: second1 {
 					new-prop;
 				};
 
 				second4 {
+					use_second1 = <&second1>;
 				};
 			};
 		};
@@ -65,12 +66,13 @@
 		};
 
 		second: second {
-			second1 {
+			second_1_bad: second1 {
 				some-prop;
 			};
 
 			second2 {
 				some-prop;
+				use_second1_bad = <&second_1_bad>;
 			};
 		};
 	};
diff --git a/tools/dtoc/test_fdt.py b/tools/dtoc/test_fdt.py
index 3e54694eec..0b01518f3a 100755
--- a/tools/dtoc/test_fdt.py
+++ b/tools/dtoc/test_fdt.py
@@ -32,6 +32,7 @@ from dtoc.fdt import Type, BytesToValue
 import libfdt
 from u_boot_pylib import test_util
 from u_boot_pylib import tools
+from u_boot_pylib import tout
 
 #pylint: disable=protected-access
 
@@ -308,7 +309,7 @@ class TestNode(unittest.TestCase):
 
     def test_copy_node(self):
         """Test copy_node() function"""
-        def do_copy_checks(dtb, dst, expect_none):
+        def do_copy_checks(dtb, dst, second1_ph_val, expect_none):
             self.assertEqual(
                 ['/dest/base', '/dest/first@0', '/dest/existing'],
                 [n.path for n in dst.subnodes])
@@ -339,8 +340,8 @@ class TestNode(unittest.TestCase):
             over = dtb.GetNode('/dest/base/over')
             self.assertTrue(over)
 
-            # Make sure that the phandle for 'over' is not copied
-            self.assertNotIn('phandle', over.props.keys())
+            # Make sure that the phandle for 'over' is copied
+            self.assertIn('phandle', over.props.keys())
 
             second = dtb.GetNode('/dest/base/second')
             self.assertTrue(second)
@@ -348,7 +349,7 @@ class TestNode(unittest.TestCase):
                              [n.name for n in chk.subnodes])
             self.assertEqual(chk, over.parent)
             self.assertEqual(
-                {'bootph-all', 'compatible', 'reg', 'low-power'},
+                {'bootph-all', 'compatible', 'reg', 'low-power', 'phandle'},
                 over.props.keys())
 
             if expect_none:
@@ -365,20 +366,43 @@ class TestNode(unittest.TestCase):
                 ['second1', 'second2', 'second3', 'second4'],
                 [n.name for n in second.subnodes])
 
+            # Check the 'second_1_bad' phandle is not copied over
+            second1 = second.FindNode('second1')
+            self.assertTrue(second1)
+            sph = second1.props.get('phandle')
+            self.assertTrue(sph)
+            self.assertEqual(second1_ph_val, sph.bytes)
+
+
         dtb = fdt.FdtScan(find_dtb_file('dtoc_test_copy.dts'))
         tmpl = dtb.GetNode('/base')
         dst = dtb.GetNode('/dest')
+        second1_ph_val = (dtb.GetNode('/dest/base/second/second1').
+                          props['phandle'].bytes)
         dst.copy_node(tmpl)
 
-        do_copy_checks(dtb, dst, expect_none=True)
+        do_copy_checks(dtb, dst, second1_ph_val, expect_none=True)
 
         dtb.Sync(auto_resize=True)
 
-        # Now check that the FDT looks correct
+        # Now check the resulting FDT. It should have duplicate phandles since
+        # 'over' has been copied to 'dest/base/over' but still exists in its old
+        # place
         new_dtb = fdt.Fdt.FromData(dtb.GetContents())
+        with self.assertRaises(ValueError) as exc:
+            new_dtb.Scan()
+        self.assertIn(
+            'Duplicate phandle 1 in nodes /dest/base/over and /base/over',
+            str(exc.exception))
+
+        # Remove the source nodes for the copy
+        new_dtb.GetNode('/base').Delete()
+
+        # Now it should scan OK
         new_dtb.Scan()
+
         dst = new_dtb.GetNode('/dest')
-        do_copy_checks(new_dtb, dst, expect_none=False)
+        do_copy_checks(new_dtb, dst, second1_ph_val, expect_none=False)
 
     def test_copy_subnodes_from_phandles(self):
         """Test copy_node() function"""
@@ -404,7 +428,7 @@ class TestNode(unittest.TestCase):
 
         # Make sure that the phandle for 'over' is not copied
         over = dst.FindNode('over')
-        print('keys', over.props.keys())
+        tout.debug(f'keys: {over.props.keys()}')
         self.assertNotIn('phandle', over.props.keys())
 
         # Check the merged properties, first the base ones in '/dest'