binman: Tidy up setting of entry contents

At present the contents of an entry are set in subclasses simply by
assigning to the data and content_size properties. Add some methods to do
this, so that we have more control. In particular, add a method to set the
contents without changing its size, so we can validate that case.

Add a test case for trying to change the size when this is not allowed.

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

1 files changed, 14 insertions, 0 deletions

diff --git a/tools/binman/test/59_change_size.dts b/tools/binman/test/59_change_size.dts
new file mode 100644
index 0000000000..1a69026a64
--- /dev/null
+++ b/tools/binman/test/59_change_size.dts
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		_testing {
+			bad-update-contents;
+		};
+	};
+};