dev-manual: add bblock documentation

bblock is a helper tool to lock/unlock tasks and recipes to specific
signatures. Add a documentation page for it.

(From yocto-docs rev: a082aa39840587d3af6c3f4a2c2747564ca37414)

Signed-off-by: Julien Stephan <jstephan@baylibre.com>
Reviewed-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 11ad1f4dc6..43f4d79663 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -7901,6 +7901,9 @@ system and gives an overview of their function and contents.
      Then you can look at files in ``build/tmp/stamps/<arch>/bc`` and look for
      files like: ``<PV>.do_compile.sigdata.09772aa4532512baf96d433484f27234d4b7c11dd9cda0d6f56fa1b7ce6f25f0``.
 
+     Alternatively, you can also use :doc:`bblock </dev-manual/bblock>` to
+     generate this line for you.
+
    :term:`SIGGEN_LOCKEDSIGS_TASKSIG_CHECK`
      Specifies the debug level of task signature check. 3 levels are supported: