doc: release-notes-2.6: west extensions

Just the extensions changes for Zephyr 2.6, since west has its own
release notes page as it's developed on its own pace.

Signed-off-by: Martí Bolívar <[email protected]>

Author: mbolivar-nordic

doc/guides/west/release-notes.rst

@@ -1,3 +1,5 @@
+.. _west-release-notes:
+
 West Release Notes
 ##################
 

doc/releases/release-notes-2.6.rst

@@ -759,11 +759,48 @@ Build and Infrastructure
     upstream Linux regular expression used to validate compatible properties.
     This regular expression requires a letter as the first character.
 
-* West
-
-  * Improve bossac runner.  Added legacy mode option into extended SAM-BA
-    bootloader selection.  This extends compatibility between Zephyr and
-    some Arduino IDE bootloaders.
+* West (extensions)
+
+  * This section only covers west :ref:`west-extensions` maintained in the
+    zephyr repository. For release notes on west's built-in features, see
+    :ref:`west-release-notes`.
+
+  * Changes to the runners backends used for :ref:`flashing and debugging
+    commands <west-build-flash-debug>`:
+
+    * bossac runner: added legacy mode option into extended SAM-BA
+      bootloader selection. This extends compatibility between Zephyr and
+      some Arduino IDE bootloaders.
+
+    * jlink runner: Zephyr thread awareness is now available in GDB by default
+      for application builds with :option:`CONFIG_DEBUG_THREAD_INFO` set to ``y``
+      in :ref:`kconfig`. This applies to ``west debug``, ``west debugserver``,
+      and ``west attach``. JLink version 7.11b or later must be installed on the
+      host system, with JLink 7.20 or later strongly recommended.
+
+    * jlink runner: default ``west flash`` output is less verbose. The old
+      behavior is still available when run as ``west --verbose flash``.
+
+    * jlink runner: when flashing, this runner now prefers a ``.hex`` file
+      generated by the build system to a ``.bin``. Unlike ``.bin``, the HEX
+      format includes information on the image's address range in flash, so
+      this works better when flashing Zephyr images linked for locations other
+      than the target's boot address, e.g. images meant to be run by
+      bootloaders. The ``.bin`` file is still used as a fallback if a HEX File
+      is not present.
+
+    * openocd runner: support for ``west debug`` and ``west attach`` has been
+      fixed. Previously with this runner, ``west debug`` behaved like ``west
+      attach`` should, and ``west attach`` behaved like ``west debugserver``
+      should.
+
+    * pyocd runner: board-specific pyOCD configuration files in YAML can now be
+      placed in :file:`support/pyocd.yaml` inside the board directory. See
+      :zephyr_file:`boards/arm/reel_board/support/pyocd.yaml` for an example,
+      and the pyOCD documentation for details on its configuration format.
+
+  * ``west spdx``: new command which can be used to generate SPDX software
+    bills of materials for a Zephyr application build. See :ref:`west-spdx`.
 
 
 Libraries / Subsystems