binman: Add an entry filled with a repeating byte

It is sometimes useful to have an area of the image which is all zeroes,
or all 0xff. This can often be achieved by padding the size of an an
existing entry and setting the pad byte for an entry or image.

But it is useful to have an explicit means of adding blocks of repeating
data to the image. Add a 'fill' entry type to handle this.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/README.entries b/tools/binman/README.entries
index 147dd40..6f09626 100644
--- a/tools/binman/README.entries
+++ b/tools/binman/README.entries
@@ -55,6 +55,22 @@
 
 
 
+Entry: fill: An entry which is filled to a particular byte value
+----------------------------------------------------------------
+
+Properties / Entry arguments:
+    - fill-byte: Byte to use to fill the entry
+
+Note that the size property must be set since otherwise this entry does not
+know how large it should be.
+
+You can often achieve the same effect using the pad-byte property of the
+overall image, in that the space between entries will then be padded with
+that byte. But this entry is sometimes useful for explicitly setting the
+byte value of a region.
+
+
+
 Entry: fmap: An entry which contains an Fmap section
 ----------------------------------------------------
 
diff --git a/tools/binman/etype/fill.py b/tools/binman/etype/fill.py
new file mode 100644
index 0000000..7210a83
--- /dev/null
+++ b/tools/binman/etype/fill.py
@@ -0,0 +1,32 @@
+# SPDX-License-Identifier: GPL-2.0+
+# Copyright (c) 2018 Google, Inc
+# Written by Simon Glass <sjg@chromium.org>
+#
+
+from entry import Entry
+import fdt_util
+
+
+class Entry_fill(Entry):
+    """An entry which is filled to a particular byte value
+
+    Properties / Entry arguments:
+        - fill-byte: Byte to use to fill the entry
+
+    Note that the size property must be set since otherwise this entry does not
+    know how large it should be.
+
+    You can often achieve the same effect using the pad-byte property of the
+    overall image, in that the space between entries will then be padded with
+    that byte. But this entry is sometimes useful for explicitly setting the
+    byte value of a region.
+    """
+    def __init__(self, section, etype, node):
+        Entry.__init__(self, section, etype, node)
+        if not self.size:
+            self.Raise("'fill' entry must have a size property")
+        self.fill_value = fdt_util.GetByte(self._node, 'fill-byte', 0)
+
+    def ObtainContents(self):
+        self.SetContents(chr(self.fill_value) * self.size)
+        return True
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index 5428ee6..4e46714 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -1235,6 +1235,19 @@
         data, _, _, _ = self._DoReadFileDtb('68_blob_named_by_arg.dts',
                                             entry_args=entry_args)
 
+    def testFill(self):
+        """Test for an fill entry type"""
+        data = self._DoReadFile('69_fill.dts')
+        expected = 8 * chr(0xff) + 8 * chr(0)
+        self.assertEqual(expected, data)
+
+    def testFillNoSize(self):
+        """Test for an fill entry type with no size"""
+        with self.assertRaises(ValueError) as e:
+            self._DoReadFile('70_fill_no_size.dts')
+        self.assertIn("'fill' entry must have a size property",
+                      str(e.exception))
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/tools/binman/test/69_fill.dts b/tools/binman/test/69_fill.dts
new file mode 100644
index 0000000..e372ea3
--- /dev/null
+++ b/tools/binman/test/69_fill.dts
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		size = <16>;
+		fill {
+			size = <8>;
+			fill-byte = [ff];
+		};
+	};
+};
diff --git a/tools/binman/test/70_fill_no_size.dts b/tools/binman/test/70_fill_no_size.dts
new file mode 100644
index 0000000..7b1fcf1
--- /dev/null
+++ b/tools/binman/test/70_fill_no_size.dts
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		size = <16>;
+		fill {
+			fill-byte = [ff];
+		};
+	};
+};