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 5ef1246f2961e825cc0391132ee1c11c7ca7a4d0..32d89194dd0e000ef9247ebddf9bf5aaa02b02bb 100644 (file)
--- a/tools/binman/README
+++ b/tools/binman/README
@@ -316,6 +316,13 @@ type:
        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.