binman: Allow mkimage to use a non-zero fake-blob size

Unfortunately mkimage gets upset with zero-sized files. Update the
ObtainContents() method to support specifying the size, if a fake blob is
created.

Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Alper Nebi Yasak <[email protected]>

1 files changed, 18 insertions, 0 deletions

diff --git a/tools/binman/test/229_mkimage_missing.dts b/tools/binman/test/229_mkimage_missing.dts
new file mode 100644
index 00000000000..54a5a6c571a
--- /dev/null
+++ b/tools/binman/test/229_mkimage_missing.dts
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/dts-v1/;
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	binman {
+		mkimage {
+			args = "-n test -T script";
+
+			blob-ext {
+				filename = "missing.bin";
+			};
+		};
+	};
+};