Add verified boot information and test

Add a description of how to implement verified boot using signed FIT images,
and a simple test which verifies operation on sandbox.

The test signs a FIT image and verifies it, then signs a FIT configuration
and verifies it. Then it corrupts the signature to check that this is
detected.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/test/vboot/sandbox-u-boot.dts b/test/vboot/sandbox-u-boot.dts
new file mode 100644
index 000000000..a1e853c9c
--- /dev/null
+++ b/test/vboot/sandbox-u-boot.dts
@@ -0,0 +1,7 @@
+/dts-v1/;
+
+/ {
+	model = "Sandbox Verified Boot Test";
+	compatible = "sandbox";
+
+};