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-rw-r--r--doc/mkimage.16
1 files changed, 6 insertions, 0 deletions
diff --git a/doc/mkimage.1 b/doc/mkimage.1
index b67a35178a..14374da88a 100644
--- a/doc/mkimage.1
+++ b/doc/mkimage.1
@@ -133,6 +133,12 @@ the corresponding public key is written into this file for for run-time
verification. Typically the file here is the device tree binary used by
CONFIG_OF_CONTROL in U-Boot.
+.TP
+.BI "\-r
+Specifies that keys used to sign the FIT are required. This means that they
+must be verified for the image to boot. Without this option, the verification
+will be optional (useful for testing but not for release).
+
.SH EXAMPLES
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