The Team Keil, a part ARM, has released Arm Keil MDK 5.42a is the most comprehensive software development solution for Arm-based microcontrollers and includes all components that you need to create, build, and debug embedded applications.

MDK-ARM Version 5.42a - Release Date: 17th March, 2025

- Fixed MDK installation fails with dialog message: "Cannot create destination file. …" if Windows uses a chinese character set.
- Added missing MTItoCoverage.dll in ARM\avh-fvp\bin\models preventing the models to launch in case load and/or store coverage information checkbox is enabled.

The Keil products from ARM include C/C++ compilers, debuggers, integrated development and simulation environments, RTOS and middleware libraries, and evaluation boards for ARM, Cortex-M, Cortex-R4, 8051, C166, and 251 processor families. Since the acquisition, ARM has continued the development and support of Keil products for existing 8051, 251, and C166 markets.
[µVision updated to V5.42.0.0]
- Fixed Core Peripheral debug window for Arm Cortex-M52 based devices not displaying secure and non-secure registers.
- Fixed source file referenced via UNC path not found during debug.
- Fixed failing build after loading generator component's updated *.gpdcs file.
- Added Key Sequence letter "A" for accessing linker map files.
- Added support for numbers and symbols in Configuration Wizard annotation .
- The latest Keil::STM32* CMSIS Pack versions make use of the STM32Cube global generator and do not have a "Device:Startup" component. Therefore the "CMSIS_device_header" macro is undefined.
- When loading a CMSIS Solution project (*.csolution.yml) missing packs are detected by "cbuild" and installed by "cpackget" therefore no installation via the MDK pack installer will be triggered.
- When using MDK µVision for debugging ELF files from CMSIS Solution projects using the command line and/or the CMSIS Solution VS Code extension, ensure that the same CMSIS Pack Root directory is configured to avoid unnecessary duplication of pack installations.
- It is recommended to install Device Family Packs (DFP) using the MDK PackInstaller to ensure that SVD files are converted during installation.

Arm Compiler for Embedded version 6.23 - see Release Notes for further details.

Keil::MDK-Middleware@8.0.0 (major new version)
- Revision History.
- Network Component Version 8.0.0.
- FileSystem Component Version 8.0.0.
- USB Component Version 8.0.0.
ARM::CMSIS@6.1.0. (unchanged)
ARM::CMSIS-Compiler@2.1.0. (unchanged)
ARM::CMSIS-Driver@2.10.0. (updated)
ARM::CMSIS-DSP@1.16.2. (unchanged)
ARM::CMSIS-NN@7.0.0. (updated)
ARM::CMSIS-RTX@5.9.0. (unchanged)
ARM::CMSIS-View@1.2.0. (unchanged)
ARM::Cortex_DFP@1.1.0. (unchanged)

Updated the CMSIS-Toolbox to version 2.8.0. See Release Notes for details.

AVH FVP Models were updated to version 11.28.32.

Segger J-Link
- Updated debug driver to version 8.16.
STMicroelectronics ST-LINK (unchanged)
- Update ST-Link utility to latest version 3.16.7.
Nuvoton NU-Link
- NuLink driver version 3.19.7746r

- Arm Compiler 6 version 6.22 - see Release Notes for further details.

Keil::MDK-Middleware@7.17.0
- All components require the Event Recorder component from ARM::CMSIS-View pack (instead of deprecated ARM_Compiler pack).
- All component configuration files got updated.
- For details see the "Revision History" of the component documentation.
. Network Component Version 7.19.0
. Network Component Version 6.7.7 was deprecated and got removed.
. FileSystem Component Version 6.16.6
. USB Component Version 6.17.0
ARM::CMSIS@6.1.0
- Added support for Arm Cortex-M52.
- Added CoreDebug symbols back for compatibility with CMSIS_5. Use define "CMSIS_DISABLE_DEPRECATED" to hide symbols.
ARM::CMSIS-Compiler@2.1.0
- Enabled use with Arm Cortex-M52 based devices. For bug fixes refer to the Revision History.
ARM::CMSIS-Driver@2.8.0
- Aligned with CMSIS v6.
ARM::CMSIS-DSP@1.15.0 (unchanged)
ARM::CMSIS-NN@5.0.0
- This is non backward compatible API change, for improved read efficiency in FC for MVE extension. The new api changes are arm_vector_sum_s8, arm_svdf_s8 and arm_svdf_s8_get_buffer_size_mve. Please refer to arm_nnfunctions.h for details.
ARM::CMSIS-RTX@5.9.0
- Enabled use with Arm Cortex-M52 based devices.
- Removed the dependency on "Device:Startup" component.
ARM::CMSIS-View@1.1.0
- Enabled use with Arm Cortex-M52 based devices.
ARM::Cortex_DFP@1.1.0
- Added Arm Cortex-M52 based device "ARMCM52"

- Updated the CMSIS-Toolbox to version 2.4.0. See Release Notes for details.

- AVH FVP Models were updated to version 11.24.24.
. Added the Corstone SSE-315 (Cortex-M85) model with the Mali-C55 Image Signal Processor (ISP) and the Ethos-U65 machine learning processor (NPU).
. Added the model for Cortex-M52 core (MPS2).
. AVH FVP models can now be run only if MDK is activated with a User-based License (UBL), and do not work with node-lock/flex licenses. If you want to run models under legacy licensing technology, you need to copy the VHT/FVP models from older MDK installations.
- The AVH models were previously located in '\ARM\VHT' have been now moved to '\ARM\avh-fvp' and renamed (starting with "FVP_" prefix instead of "VHT_"). This fully aligns the AVH FVP deliverables in MDK installer with other delivery channels (such as Arm tools artifactory).

Segger J-Link
- Updated debug driver to version 7.96h.
STMicroelectronics ST-LINK
- Updated ST-LINK driver to version 3.3.0 and ST-Link Upgrade Utility to version 3.15.6.
Nuvoton NU-Link
- Update