binman: Move image/fdt code into PrepareImagesAndDtbs()

Further reduce the size of the main Binman() function by moving this setup
code into its own function.

Note that the 'images' value is accessed from other modules so must be made
a global.
Signed-off-by: NSimon Glass <sjg@chromium.org>

tools/binman/control.py

@@ -169,6 +169,75 @@ def ExtractEntries(image_fname, output_fname, outdir, entry_paths,
     return einfos
 
 
+def PrepareImagesAndDtbs(dtb_fname, select_images, update_fdt):
+    """Prepare the images to be processed and select the device tree
+
+    This function:
+    - reads in the device tree
+    - finds and scans the binman node to create all entries
+    - selects which images to build
+    - Updates the device tress with placeholder properties for offset,
+        image-pos, etc.
+
+    Args:
+        dtb_fname: Filename of the device tree file to use (.dts or .dtb)
+        selected_images: List of images to output, or None for all
+        update_fdt: True to update the FDT wth entry offsets, etc.
+    """
+    # Import these here in case libfdt.py is not available, in which case
+    # the above help option still works.
+    import fdt
+    import fdt_util
+    global images
+
+    # Get the device tree ready by compiling it and copying the compiled
+    # output into a file in our output directly. Then scan it for use
+    # in binman.
+    dtb_fname = fdt_util.EnsureCompiled(dtb_fname)
+    fname = tools.GetOutputFilename('u-boot.dtb.out')
+    tools.WriteFile(fname, tools.ReadFile(dtb_fname))
+    dtb = fdt.FdtScan(fname)
+
+    node = _FindBinmanNode(dtb)
+    if not node:
+        raise ValueError("Device tree '%s' does not have a 'binman' "
+                            "node" % dtb_fname)
+
+    images = _ReadImageDesc(node)
+
+    if select_images:
+        skip = []
+        new_images = OrderedDict()
+        for name, image in images.items():
+            if name in select_images:
+                new_images[name] = image
+            else:
+                skip.append(name)
+        images = new_images
+        tout.Notice('Skipping images: %s' % ', '.join(skip))
+
+    state.Prepare(images, dtb)
+
+    # Prepare the device tree by making sure that any missing
+    # properties are added (e.g. 'pos' and 'size'). The values of these
+    # may not be correct yet, but we add placeholders so that the
+    # size of the device tree is correct. Later, in
+    # SetCalculatedProperties() we will insert the correct values
+    # without changing the device-tree size, thus ensuring that our
+    # entry offsets remain the same.
+    for image in images.values():
+        image.ExpandEntries()
+        if update_fdt:
+            image.AddMissingProperties()
+        image.ProcessFdt(dtb)
+
+    for dtb_item in state.GetFdts():
+        dtb_item.Sync(auto_resize=True)
+        dtb_item.Pack()
+        dtb_item.Flush()
+    return images
+
+
 def ProcessImage(image, update_fdt, write_map):
     """Perform all steps for this image, including checking and # writing it.
 
@@ -234,8 +303,6 @@ def Binman(args):
     Args:
         args: Command line arguments Namespace object
     """
-    global images
-
     if args.full_help:
         pager = os.getenv('PAGER')
         if not pager:
@@ -272,11 +339,6 @@ def Binman(args):
         args.indir.append(board_pathname)
 
     try:
-        # Import these here in case libfdt.py is not available, in which case
-        # the above help option still works.
-        import fdt
-        import fdt_util
-
         tout.Init(args.verbosity)
         elf.debug = args.debug
         cbfs_util.VERBOSE = args.verbosity > 2
@@ -287,53 +349,8 @@ def Binman(args):
             tools.SetToolPaths(args.toolpath)
             state.SetEntryArgs(args.entry_arg)
 
-            # Get the device tree ready by compiling it and copying the compiled
-            # output into a file in our output directly. Then scan it for use
-            # in binman.
-            dtb_fname = fdt_util.EnsureCompiled(dtb_fname)
-            fname = tools.GetOutputFilename('u-boot.dtb.out')
-            tools.WriteFile(fname, tools.ReadFile(dtb_fname))
-            dtb = fdt.FdtScan(fname)
-
-            node = _FindBinmanNode(dtb)
-            if not node:
-                raise ValueError("Device tree '%s' does not have a 'binman' "
-                                 "node" % dtb_fname)
-
-            images = _ReadImageDesc(node)
-
-            if args.image:
-                skip = []
-                new_images = OrderedDict()
-                for name, image in images.items():
-                    if name in args.image:
-                        new_images[name] = image
-                    else:
-                        skip.append(name)
-                images = new_images
-                if skip and args.verbosity >= 2:
-                    print('Skipping images: %s' % ', '.join(skip))
-
-            state.Prepare(images, dtb)
-
-            # Prepare the device tree by making sure that any missing
-            # properties are added (e.g. 'pos' and 'size'). The values of these
-            # may not be correct yet, but we add placeholders so that the
-            # size of the device tree is correct. Later, in
-            # SetCalculatedProperties() we will insert the correct values
-            # without changing the device-tree size, thus ensuring that our
-            # entry offsets remain the same.
-            for image in images.values():
-                image.ExpandEntries()
-                if args.update_fdt:
-                    image.AddMissingProperties()
-                image.ProcessFdt(dtb)
-
-            for dtb_item in state.GetFdts():
-                dtb_item.Sync(auto_resize=True)
-                dtb_item.Pack()
-                dtb_item.Flush()
-
+            images = PrepareImagesAndDtbs(dtb_fname, args.image,
+                                          args.update_fdt)
             for image in images.values():
                 ProcessImage(image, args.update_fdt, args.map)