[PATCH] ref-manual: expand on kernel "do_sizecheck" task

Expand on the description of do_sizecheck() to mention that it will
size-check on *all* kernel images listed in KERNEL_IMAGETYPES.

Signed-off-by: Robert P. J. Day <[email protected]>

---

diff --git a/documentation/ref-manual/tasks.rst b/documentation/ref-manual/tasks.rst
index e1db2d5ed..db0abad00 100644
--- a/documentation/ref-manual/tasks.rst
+++ b/documentation/ref-manual/tasks.rst
@@ -837,11 +837,10 @@ can successfully build the kernel modules in the next step of the build.
 ``do_sizecheck``
 ----------------

-After the kernel has been built, this task checks the size of the
-stripped kernel image against
-:term:`KERNEL_IMAGE_MAXSIZE`. If that
-variable was set and the size of the stripped kernel exceeds that size,
-the kernel build produces a warning to that effect.
+If the variable :term:`KERNEL_IMAGE_MAXSIZE` is set, this task compares
+the size of all stripped kernel images listed in :term:`KERNEL_IMAGETYPES`
+against that value. If more than one image type is listed there, warn on
+any that exceed that value, but fail only if none of them fit.

 .. _ref-tasks-strip:

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index c92b195ff..ba83b6e6f 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -5603,17 +5603,18 @@ system and gives an overview of their function and contents.
       information.

    :term:`KERNEL_IMAGE_MAXSIZE`
-      Specifies the maximum size of the kernel image file in kilobytes. If
-      :term:`KERNEL_IMAGE_MAXSIZE` is set, the size of the kernel image file is
-      checked against the set value during the
-      :ref:`ref-tasks-sizecheck` task. The task fails if
-      the kernel image file is larger than the setting.
+      Specifies the maximum allowable size of the kernel image file in kilobytes.
+      If this variable is set, the sizes of all of the kernel image files listed
+      in :term:`KERNEL_IMAGETYPES` are checked against this value during the
+      :ref:`ref-tasks-sizecheck` task. That task will warn about any of the
+      kernel images that exceed the maximum, and will fail only if all images
+      are too large.

       :term:`KERNEL_IMAGE_MAXSIZE` is useful for target devices that have a
       limited amount of space in which the kernel image must be stored.

       By default, this variable is not set, which means the size of the
-      kernel image is not checked.
+      kernel images are not checked.

    :term:`KERNEL_IMAGE_NAME`
       The base name of the kernel image. This variable is set in the