ref-manual/variables.rst: document SPL_DTB_BINARY

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

(From yocto-docs rev: 05eb461cb1da76ad9cbaf634da7f47447b3f6765)

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

1 files changed, 5 insertions, 0 deletions

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index bd82b9484a..d722d722fd 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -8875,6 +8875,11 @@ 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`