binman: Support compression of sections
With the previous changes, it is now possible to compress entire
sections. Add some tests to check that compression works correctly,
including updating the metadata.
Also update the documentation.
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/binman/README b/tools/binman/README
index c14cee5..de1eedf 100644
--- a/tools/binman/README
+++ b/tools/binman/README
@@ -853,6 +853,14 @@
algorithm. Currently this is the only one that is supported. The uncompressed
size is written to the node in an 'uncomp-size' property, if -u is used.
+Compression is also supported for sections. In that case the entire section is
+compressed in one block, including all its contents. This means that accessing
+an entry from the section required decompressing the entire section. Also, the
+size of a section indicates the space that it consumes in its parent section
+(and typically the image). With compression, the section may contain more data,
+and the uncomp-size property indicates that, as above. The contents of the
+section is compressed first, before any padding is added. This ensures that the
+padding itself is not compressed, which would be a waste of time.
Map files