migration-guides: start of 4.3 migration and release notes

From notes from Richard Purdie

(From yocto-docs rev: 62fcaabd06558669034e8732b8d22a9c46e36cf2)

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
CC: richard.purdie@linuxfoundation.org
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/migration-guides/index.rst

@@ -12,6 +12,7 @@ to move to one release of the Yocto Project from the previous one.
 .. toctree::
 
    migration-general
+   release-4.3
    release-4.2
    release-4.1
    release-4.0

documentation/migration-guides/migration-4.3.rst

@@ -0,0 +1,73 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+Release 4.3 (nanbield)
+========================
+
+Migration notes for 4.3 (nanbield)
+------------------------------------
+
+This section provides migration information for moving to the Yocto
+Project 4.3 Release (codename "nanbield") from the prior release.
+
+.. _migration-4.3-supported-distributions:
+
+Supported distributions
+~~~~~~~~~~~~~~~~~~~~~~~
+
+This release supports running BitBake on new GNU/Linux distributions:
+
+On the other hand, some earlier distributions are no longer supported:
+
+See :ref:`all supported distributions <system-requirements-supported-distros>`.
+
+.. _migration-4.3-go-changes:
+
+Go language changes
+~~~~~~~~~~~~~~~~~~~
+
+-  Support for the Glide package manager has been removed, as ``go mod``
+   has become the standard.
+  
+.. _migration-4.3-recipe-changes:
+
+Recipe changes
+~~~~~~~~~~~~~~
+
+-  Runtime testing of ptest now fails if no test results are returned by
+   any given ptest.
+
+.. _migration-4.3-removed-variables:
+
+Removed variables
+~~~~~~~~~~~~~~~~~
+
+The following variables have been removed:
+
+.. _migration-4.3-removed-recipes:
+
+Removed recipes
+~~~~~~~~~~~~~~~
+
+The following recipes have been removed in this release:
+
+-  ``glide``, as explained in :ref:`migration-4.3-go-changes`.
+
+.. _migration-4.3-removed-classes:
+
+Removed classes
+~~~~~~~~~~~~~~~
+
+The following classes have been removed in this release:
+
+
+.. _migration-4.3-misc-changes:
+
+Miscellaneous changes
+~~~~~~~~~~~~~~~~~~~~~
+
+-  The ``-crosssdk`` suffix and any :term:`MLPREFIX` were removed from
+   ``virtual/XXX`` provider/dependencies where a ``PREFIX`` was used as well,
+   as we don't need both and it made automated dependency rewriting
+   unnecessarily complex. In general this only affects internal toolchain
+   dependencies so isn't end user visible.
+

documentation/migration-guides/release-4.3.rst

@@ -0,0 +1,9 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+Release 4.3 (nanbield)
+========================
+
+.. toctree::
+
+   migration-4.3
+   release-notes-4.3

documentation/migration-guides/release-notes-4.3.rst

@@ -0,0 +1,55 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
+Release notes for 4.3 (nandbield)
+----------------------------------
+
+New Features / Enhancements in 4.3
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+-  Linux kernel 6.x, glibc 2.xx and ~xxx other recipe upgrades
+
+-  New variables:
+
+-  Architecture-specific enhancements:
+
+-  Kernel-related enhancements:
+
+-  New core recipes:
+
+-  QEMU/runqemu enhancements:
+
+-  Image-related enhancements:
+
+-  wic Image Creator enhancements:
+
+-  SDK-related improvements:
+
+-  Testing:
+
+-  Utility script changes:
+
+-  BitBake improvements:
+
+   -  The BitBake Cooker log now contains notes when the caches are
+      invalidated which is useful for memory resident bitbake debugging.
+
+-  Packaging changes:
+
+-  Miscellaneous changes:
+
+Known Issues in 4.3
+~~~~~~~~~~~~~~~~~~~
+
+Recipe License changes in 4.3
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The following corrections have been made to the :term:`LICENSE` values set by recipes:
+
+Security Fixes in 4.3
+~~~~~~~~~~~~~~~~~~~~~
+
+Recipe Upgrades in 4.3
+~~~~~~~~~~~~~~~~~~~~~~
+
+Contributors to 4.3
+~~~~~~~~~~~~~~~~~~~