[PATCH 13/25] binman: Make section padding consistent with other entries

[Simon Glass]

At present padding of sections is inconsistent with other entry types, in
that different pad bytes are used.

When a normal entry is padded by its parent, the parent's pad byte is
used. But for sections, the section's pad byte is used.

Adjust logic to always do this the same way.

Note there is still a special case in entry_Section.GetPaddedData() where
an image is padded with the pad byte of the top-level section. This is
necessary since otherwise there would be no way to set the pad byte of
the image, without adding a top-level section to every image.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 tools/binman/etype/section.py           |  4 +--
 tools/binman/ftest.py                   | 22 ++++++++++++++++
 tools/binman/test/177_section_pad.dts   | 27 ++++++++++++++++++++
 tools/binman/test/178_section_align.dts | 34 +++++++++++++++++++++++++
 4 files changed, 85 insertions(+), 2 deletions(-)
 create mode 100644 tools/binman/test/177_section_pad.dts
 create mode 100644 tools/binman/test/178_section_align.dts

diff --git a/tools/binman/etype/section.py b/tools/binman/etype/section.py
index 7cbb50057a3..c423a22c80f 100644
--- a/tools/binman/etype/section.py
+++ b/tools/binman/etype/section.py
@@ -165,14 +165,14 @@ class Entry_section(Entry):
         data = b''
         # Handle padding before the entry
         if entry.pad_before:
-            data += tools.GetBytes(pad_byte, entry.pad_before)
+            data += tools.GetBytes(self._pad_byte, entry.pad_before)
 
         # Add in the actual entry data
         data += entry.GetData()
 
         # Handle padding after the entry
         if entry.pad_after:
-            data += tools.GetBytes(pad_byte, entry.pad_after)
+            data += tools.GetBytes(self._pad_byte, entry.pad_after)
 
         if entry.size:
             data += tools.GetBytes(pad_byte, entry.size - len(data))
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index e265941a392..a43f79cc248 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -3821,6 +3821,28 @@ class TestFunctional(unittest.TestCase):
         self.assertIn("too small to hold data (need %#x more bytes)" % short,
                       str(e.exception))
 
+    def testSectionPad(self):
+        """Testing padding with sections"""
+        data = self._DoReadFile('177_section_pad.dts')
+        expected = (tools.GetBytes(ord('&'), 3) +
+                    tools.GetBytes(ord('!'), 5) +
+                    U_BOOT_DATA +
+                    tools.GetBytes(ord('!'), 1) +
+                    tools.GetBytes(ord('&'), 2))
+        self.assertEqual(expected, data)
+
+    def testSectionAlign(self):
+        """Testing alignment with sections"""
+        data = self._DoReadFileDtb('178_section_align.dts', map=True)[0]
+        expected = (b'\0' +                         # fill section
+                    tools.GetBytes(ord('&'), 1) +   # padding to section align
+                    b'\0' +                         # fill section
+                    tools.GetBytes(ord('!'), 3) +   # padding to u-boot align
+                    U_BOOT_DATA +
+                    tools.GetBytes(ord('!'), 4) +   # padding to u-boot size
+                    tools.GetBytes(ord('!'), 4))    # padding to section size
+        self.assertEqual(expected, data)
+
 
 if __name__ == "__main__":
     unittest.main()
diff --git a/tools/binman/test/177_section_pad.dts b/tools/binman/test/177_section_pad.dts
new file mode 100644
index 00000000000..7e4ebf257b8
--- /dev/null
+++ b/tools/binman/test/177_section_pad.dts
@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		pad-byte = <0x26>;
+		section at 0 {
+			read-only;
+
+			/* Padding for the section uses the 0x26 pad byte */
+			pad-before = <3>;
+			pad-after = <2>;
+
+			/* Set the padding byte for entries, i.e. u-boot */
+			pad-byte = <0x21>;
+
+			u-boot {
+				pad-before = <5>;
+				pad-after = <1>;
+			};
+		};
+	};
+};
diff --git a/tools/binman/test/178_section_align.dts b/tools/binman/test/178_section_align.dts
new file mode 100644
index 00000000000..90795d131b0
--- /dev/null
+++ b/tools/binman/test/178_section_align.dts
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		pad-byte = <0x26>;
+		fill {
+			size = <1>;
+		};
+		section at 1 {
+			read-only;
+
+			/* Padding for the section uses the 0x26 pad byte */
+			align = <2>;
+			align-size = <0x10>;
+
+			/* Set the padding byte for entries, i.e. u-boot */
+			pad-byte = <0x21>;
+
+			fill {
+				size = <1>;
+			};
+
+			u-boot {
+				align = <4>;
+				align-size = <8>;
+			};
+		};
+	};
+};
-- 
2.29.0.rc1.297.gfa9743e501-goog