binman: sunxi: Add help message for missing sunxi ATF BL31
Add a special help message pointing to the relevant README.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/missing-blob-help b/tools/binman/missing-blob-help
index 3de195c..7cf1c34 100644
--- a/tools/binman/missing-blob-help
+++ b/tools/binman/missing-blob-help
@@ -9,3 +9,7 @@
atf-bl31:
See the documentation for your board. You may need to build ARM Trusted
Firmware and build with BL31=/path/to/bl31.bin
+
+atf-bl31-sunxi:
+Please read the section on ARM Trusted Firmware (ATF) in
+board/sunxi/README.sunxi64