ref-manual: Add missing variable IMAGE_ROOTFS_MAXSIZE

This patch adds the missing documentation of variable IMAGE_ROOTFS_MAXSIZE
to the reference manual.

(From yocto-docs rev: c3c18c5f3d8f1ac8781dbc3fdbfdb53c94095f62)

Signed-off-by:
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
(cherry picked from commit 1dcc8cf7c49da449b324a7bd6bb22effe1d53d70)
Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 3ba3897787..e275221356 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -3902,6 +3902,12 @@ system and gives an overview of their function and contents.
 
          IMAGE_ROOTFS_EXTRA_SPACE = "41943040"
 
+   :term:`IMAGE_ROOTFS_MAXSIZE`
+      Defines the maximum size in Kbytes for the generated image. If the
+      generated image size is above that, the build will fail. It's a good
+      idea to set this variable for images that need to fit on a limited
+      space (e.g. SD card, a fixed-size partition, ...).
+
    :term:`IMAGE_ROOTFS_SIZE`
       Defines the size in Kbytes for the generated image. The OpenEmbedded
       build system determines the final size for the generated image using