binman: Add documentation for pos-unset property
This property is not documented. Add a note to the README.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/README b/tools/binman/README
index 5ef1246..32d8919 100644
--- a/tools/binman/README
+++ b/tools/binman/README
@@ -316,6 +316,13 @@
possible to use any name, and then add (for example) 'type = "u-boot"'
to specify the type.
+pos-unset:
+ Indicates that the position of this entry should not be set by placing
+ it immediately after the entry before. Instead, is set by another
+ entry which knows where this entry should go. When this boolean
+ property is present, binman will give an error if another entry does
+ not set the position (with the GetPositions() method).
+
The attributes supported for images are described below. Several are similar
to those for entries.