docs: migration-guides: migration-4.0: specify variable name change for kernel inclusion in image recipe

Since commit f6d963fa6d0e ("kernel: make kernel-base recommend
kernel-image, not depend"), present in Kirkstone 4.0, one should
set RRECOMMENDS and not RDEPENDS to avoid including the kernel in the
image, so let's update the documentation to reflect that.

Reported-by: Konstantin Kletschke <konstantin.kletschke@inside-m2m.de>
Cc: Quentin Schulz <foss+yocto@0leil.net>
(From yocto-docs rev: 0b19f95307f071861ecc40f000e814f3ecd0342a)

Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/documentation/migration-guides/migration-4.0.rst b/documentation/migration-guides/migration-4.0.rst
index e11809b49c..dd840f2bb3 100644
--- a/documentation/migration-guides/migration-4.0.rst
+++ b/documentation/migration-guides/migration-4.0.rst
@@ -267,3 +267,6 @@ Miscellaneous changes
   when parsing recipes. Any code depending on the previous behaviour will no longer
   work - change any such code to explicitly use appropriate path variables instead.
 
+- In order to exclude the kernel image from the image rootfs,
+  :term:`RRECOMMENDS`\ ``:${KERNEL_PACKAGE_NAME}-base`` should be set instead of
+  :term:`RDEPENDS`\ ``:${KERNEL_PACKAGE_NAME}-base``.