Simplicity SDK Platform Version 5.2.0 (June 16, 2025) - Release Notes#

Simplicity SDK Version 2025.6.0

The Platform provides infrastructure support for applications developed with higher-level protocols, and it provides an interface with the underlying hardware.

Click here for earlier releases.

Release Summary#

Release Item	Version	Release Date	Release Notes	Key Features	API Changes	Bug Fixes	Chip Enablement
Platform MCU	5.2.0	June 16, 2025	Release Notes	FreeRTOS kernel upgraded to LTS version 11.1.0 New `sl_main` component for device initialization sequence. Added Memory Protection and Attribute (MPA) Manager. Added Peripheral HAL hardware abstraction library for Series 2 & 3 devices. GCC Link Time Optimization (LTO) support.	Power/Clock Manager: New APIs for runtime clock changes and SYSCLK source control. Clock Manager: oscillator calibration override via NVM3. Memory Manager: Multi-heap operations.	Fixes in Memory Manager. Fixes in Pin Tool SPI support.	EFR32BG29 and EFR32MG29 devices EFR32BG22L devices EFR32BG24L devices
Bootloader	3.1.0	June 16, 2025	Release Notes
Security	5.2.0	June 16, 2025	Release Notes	xG29 device family support API for Code region on External flash on Series-3 API for Data region on External flash on Series-3 LTO support for SE Manager components Migrated PSA Crypto Apps initialization to sl_main	None	None	None
Micrium OS	5.18.0	June 16, 2025	Release Notes	Improved support for main stack overflow detection	None	Fixed linker warnings	EFR32BG29 and EFR32MG29 devices EFR32BG22L devices EFR32BG24L devices
CPC	4.7.0	June 16, 2025	Release Notes	Added permanent memory allocation initialization for CPC. Improved SPI bitrate configuration to default to 1 MHz. GCC Link Time Optimization (LTO) support.	New API for permanent memory allocation initialization.
MVP Math Library	5.2.0	June 16, 2025	Release Notes	None	None	None	None
RAIL Library	2.19.0	June 16, 2025	Release Notes

Impact of Release Changes#

Impact Statements | Migration Guide

Impact Statements#

None.

Migration Guide#

sl_main migration:
- See the sl_system to sl_main migration guide for detailed instructions.
- Learn more about using sl_system_compatibility in baremetal applications here.

Using This Release#

Installation and Use | Help and Feedback

Installation and Use#

To run your first demo, see our Getting Started Guides.

To kick start your development, see our Developer's Guide.

For information about Secure Vault Integration, see Secure Vault.

To review Security and Software Advisory notifications and manage your notification preferences:

Go to https://community.silabs.com/.
Log in with your account credentials.
Click your profile icon in the upper-right corner of the page.
Select Notifications from the dropdown menu.
In the Notifications section, go to the My Product Notifications tab to review historical Security and Software Advisory notifications
To manage your preferences, use the Manage Notifications tab to customize which product updates and advisories you receive.

To learn more about the software in this release, dive into our online documentation.

Help and Feedback#

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SDK Release and Maintenance Policy#

See our SDK Release and Maintenance Policy.