tools: add variable padding of data image in mkimage
Use previously unused return value of function vrec_header
to return a padding size to generic mkimage. This padding
size is used in copy_files to pad with zeros after copying
the data image.
Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/tools/mkimage.h b/tools/mkimage.h
index 950e190..ecb3032 100644
--- a/tools/mkimage.h
+++ b/tools/mkimage.h
@@ -132,7 +132,10 @@
/*
* This callback function will be executed for variable size record
* It is expected to build this header in memory and return its length
- * and a pointer to it
+ * and a pointer to it by using image_type_params.header_size and
+ * image_type_params.hdr. The return value shall indicate if an
+ * additional padding should be used when copying the data image
+ * by returning the padding length.
*/
int (*vrec_header) (struct mkimage_params *,
struct image_type_params *);