ref-manual/variables.rst: document SPL_DTB_BINARY

This variable is part of uboot-sign but not documented.

(From yocto-docs rev: 1a07897a273867b4cf26759e88e423c552a09c4a)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
(cherry picked from commit 05eb461cb1da76ad9cbaf634da7f47447b3f6765)
[fix minor conflicts in classes.rst]
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/documentation/ref-manual/classes.rst b/documentation/ref-manual/classes.rst
index e230bb69d0..2b916022bc 100644
--- a/documentation/ref-manual/classes.rst
+++ b/documentation/ref-manual/classes.rst
@@ -3163,6 +3163,9 @@ It is intended to be inherited from U-Boot recipes.
 
 The variables used by this class are:
 
+-  :term:`SPL_DTB_BINARY`: Name of the SPL device tree binary. Can be set to an
+   empty string to indicate that no SPL should be created and added to the FIT
+   image.
 -  :term:`SPL_MKIMAGE_DTCOPTS`: DTC options for U-Boot ``mkimage`` when
    building the FIT image.
 -  :term:`SPL_SIGN_ENABLE`: enable signing the FIT image.
diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 043722d823..15c726de4e 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -7795,6 +7795,11 @@ system and gives an overview of their function and contents.
       section in the Yocto Project Board Support Package Developer's Guide
       for additional information.
 
+   :term:`SPL_DTB_BINARY`
+      When inheriting the :ref:`ref-classes-uboot-sign` class, the
+      :term:`SPL_DTB_BINARY` variable contains the name of the SPL binary to be
+      compiled.
+
    :term:`SPL_MKIMAGE_DTCOPTS`
       Options for the device tree compiler passed to ``mkimage -D`` feature
       while creating a FIT image with the :ref:`ref-classes-uboot-sign`