binman: Support hashing entries
Sometimesi it us useful to be able to verify the content of entries with
a hash. Add an easy way to do this in binman. The hash information can be
retrieved from the device tree at run time.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/README b/tools/binman/README
index cf1a06d..088f3a6 100644
--- a/tools/binman/README
+++ b/tools/binman/README
@@ -466,6 +466,28 @@
binman -E >tools/binman/README.entries
+Hashing Entries
+---------------
+
+It is possible to ask binman to hash the contents of an entry and write that
+value back to the device-tree node. For example:
+
+ binman {
+ u-boot {
+ hash {
+ algo = "sha256";
+ };
+ };
+ };
+
+Here, a new 'value' property will be written to the 'hash' node containing
+the hash of the 'u-boot' entry. Only SHA256 is supported at present. Whole
+sections can be hased if desired, by adding the 'hash' node to the section.
+
+The has value can be chcked at runtime by hashing the data actually read and
+comparing this has to the value in the device tree.
+
+
Order of image creation
-----------------------