sphinx: ref-variables: Added entry for IMAGE_EFI_BOOT_FILES

IMAGE_EFI_BOOT_FILES created to help differentiate files needed between
bootimg-efi and bootimg-partition when creating the installer/.wic file.

(From yocto-docs rev: 3430e56aaa8a528a062af534610dc60346347947)

Signed-off-by: Khairul Rohaizzat Jamaluddin <khairul.rohaizzat.jamaluddin@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 37 insertions, 1 deletions

diff --git a/documentation/ref-manual/ref-variables.rst b/documentation/ref-manual/ref-variables.rst
index c49c208bc0..cf37703814 100644
--- a/documentation/ref-manual/ref-variables.rst
+++ b/documentation/ref-manual/ref-variables.rst
@@ -2902,10 +2902,46 @@ system and gives an overview of their function and contents.
       The base name of image output files. This variable defaults to the
       recipe name (``${``\ :term:`PN`\ ``}``).
 
+   IMAGE_EFI_BOOT_FILES
+      A space-separated list of files installed into the boot partition
+      when preparing an image using the Wic tool with the
+      ``bootimg-efi`` source plugin. By default,
+      the files are
+      installed under the same name as the source files. To change the
+      installed name, separate it from the original name with a semi-colon
+      (;). Source files need to be located in
+      :term:`DEPLOY_DIR_IMAGE`. Here are two
+      examples:
+      ::
+
+         IMAGE_EFI_BOOT_FILES = "${KERNEL_IMAGETYPE};bz2"
+         IMAGE_EFI_BOOT_FILES = "${KERNEL_IMAGETYPE} microcode.cpio"
+ 
+      Alternatively, source files can be picked up using a glob pattern. In
+      this case, the destination file must have the same name as the base
+      name of the source file path. To install files into a directory
+      within the target location, pass its name after a semi-colon (;).
+      Here are two examples:
+      ::
+
+         IMAGE_EFI_BOOT_FILES = "boot/loader/*"
+         IMAGE_EFI_BOOT_FILES = "boot/loader/*;boot/"
+
+      The first example
+      installs all files from ``${DEPLOY_DIR_IMAGE}/boot/loader/``
+      into the root of the target partition. The second example installs
+      the same files into a ``boot`` directory within the target partition.
+
+      You can find information on how to use the Wic tool in the
+      ":ref:`dev-manual/dev-manual-common-tasks:creating partitioned images using wic`"
+      section of the Yocto Project Development Tasks Manual. Reference
+      material for Wic is located in the
+      ":doc:`../ref-manual/ref-kickstart`" chapter.
+
    IMAGE_BOOT_FILES
       A space-separated list of files installed into the boot partition
       when preparing an image using the Wic tool with the
-      ``bootimg-partition`` or ``bootimg-efi`` source plugin. By default,
+      ``bootimg-partition`` source plugin. By default,
       the files are
       installed under the same name as the source files. To change the
       installed name, separate it from the original name with a semi-colon