posts: add pyOCD v0.42.0 release notes (#3)

Author: TeoMahnic

_posts/2025-12-16-pyocd-0.42.0-released.md

@@ -0,0 +1,93 @@
+---
+title: "pyOCD 0.42.0 released"
+date: 2025-12-16
+categories:
+  - release
+tags:
+  - news
+  - release
+  - release-patch
+  - pyocd
+author: Teo Mahnic
+excerpt: "Introducing a new `run` subcommand capable of running targets until a time limit or EOT."
+---
+
+Version 0.42.0 of pyOCD has been released and is available from PyPI. This release introduces a new subcommand,
+a number of improvements and bug fixes. The complete list is shown below.
+
+To upgrade pyOCD, just run `pip`:
+
+```
+pip install --upgrade pyocd
+```
+
+The latest pyOCD release focuses on strengthening automation workflows, led by the introduction of the new
+`run` subcommand. This command enables time-limited or EOT-terminated execution, making it well suited for
+CI/CD environments that require deterministic behavior. It provides unified access to semihosting and SWV
+streams, offering consistent console output and optional input handling during automated runs.
+
+A new standard I/O routing layer refines how output is managed across cores. The framework consolidates
+routing logic and supports console, telnet, file, and disabled modes, creating a uniform mechanism that
+simplifies multi-core scenarios.
+
+Integration with [CMSIS-Toolbox Run and Debug Management](https://open-cmsis-pack.github.io/cmsis-toolbox/YML-CBuild-Format/#run-and-debug-management)
+has also been strengthened. Configuration from `*.cbuild-run.yml` files now occupies a lower priority tier,
+sitting beneath command-line arguments and general session options to preserve explicit user intent.
+
+Additional improvements include new flash programming options, relaxed flash algorithm requirements,
+updated Zephyr RTOS thread state definitions, and expanded architecture support - most notably
+Cortex-M52 and Star-MC3 devices.
+
+Thanks again to all the contributors who helped make this release possible! ❤️
+
+[v0.42.0 on GitHub](https://github.com/pyocd/pyOCD/releases/tag/v0.42.0) \
+[v0.42.0 on PyPI](https://pypi.org/project/pyocd/0.42.0)
+
+----
+
+## New Features
+- `run` subcommand:
+  - Introduce a new `run` subcommand capable of running targets until a time limit or EOT (suited for CI/CD workflows)
+  - Supports semihosting console output/input and SWV output
+
+## Improvements
+- Standard I/O routing:
+  - Add new abstraction layer to unify STDIO routing for each core
+  - Routing support for `console`, `telnet`, `file` and `off`
+>Note: Currently only output is supported
+- [CMSIS-Toolbox Run and Debug Management](https://open-cmsis-pack.github.io/cmsis-toolbox/YML-CBuild-Format/#run-and-debug-management) integration:
+  - Add configuration layer in session options, which sits below command line arguments
+  - Disable `*.cbuild-run.yml` processing if the `target_override` option is set
+  - Improve port assignment logic for multi-core GDBServer and telnet configurations
+  - Add processing for `connect` mode configuration
+  - Add processing for `pre-reset` and `post-reset` options in `load-setup` configuration
+  - Improve error messages for missing or invalid `*.cbuild-run.yml` file
+  - Improve checking for required files
+    - Raise a warning instead of an error for missing SVD files
+    - Load SVD files only when available and when used by the subcommand
+- Flash programming:
+  - Add new session options for configuring `pre-reset` and `post-reset` type in `load` subcommand
+  - Relax flash algorithm requirement to require only RO section
+- RTOS:
+  - Update Zephyr thread state definitions to match modern versions (@mathieuchopstm)
+- CoreSight and Cortex-M:
+  - Add support for Cortex-M52 and Star-MC3 based devices (@Liu-Gu)
+  - Skip adding cores not described in the debug topology while retaining direct AP access
+
+## Fixes
+- Cortex-M:
+  - Fix incorrect reset type used in the fallback mechanism when the requested DebugSequence doesn't exist
+- CMSIS-DAP:
+  - Fix HID report sizing logic across platforms
+- CMSIS-Packs:
+  - Correct path normalization inside pack archives to support `..` in file paths (@xoriath)
+
+## Other
+- Minor documentation updates related to session option usage
+
+## New Contributors
+* @Liu-Gu made their first contribution in https://github.com/pyocd/pyOCD/pull/1852
+* @mathieuchopstm made their first contribution in https://github.com/pyocd/pyOCD/pull/1823
+* @xoriath made their first contribution in https://github.com/pyocd/pyOCD/pull/1867
+
+**Full Changelog**: https://github.com/pyocd/pyOCD/compare/v0.41.0...v0.42.0