binman: Support alignment of files

When packing files it is sometimes useful to align the start of each file,
e.g. if the flash driver can only access 32-bit-aligned data. Provides a
new property to support this.

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

tools/binman/ftest.py

@@ -4218,6 +4218,14 @@ class TestFunctional(unittest.TestCase):
         self.assertEqual(orig_image.GetEntries().keys(),
                          image.GetEntries().keys())
 
+    def testFilesAlign(self):
+        """Test alignment with files"""
+        data = self._DoReadFile('190_files_align.dts')
+
+        # The first string is 15 bytes so will align to 16
+        expect = FILES_DATA[:15] + b'\0' + FILES_DATA[15:]
+        self.assertEqual(expect, data)
+
 
 if __name__ == "__main__":
     unittest.main()