Simplicity SDK Platform Version 6.0.0 - Release Notes (Jan 22, 2026)#

Simplicity SDK Version 2025.12.0

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	6.0.0	Jan 22, 2026	Release Notes	Automatic PCLK divider selection defaults to datasheet-compliant values. Power Manager adds EM0/EM1 voltage scaling and CatNap power savings. Expanded Clock Manager validation and oscillator configuration options.	Peripheral HAL init macros renamed to _INIT_DEFAULT with standardized init signatures. UARTDRV adds extended depth query APIs returning uint16_t counts.	Clock Manager, IADC, EMU, LDMA, TIMER, and EUSART/UART fixes across Series 2. Linker and toolchain updates to enforce memory limits and remove warnings.	EFR32FG23L010F128GM40 and EFR32FG23L020F128GM40.
Bootloader	3.2.0	Jan 22, 2026	Release Notes	Added EM4 GPIO retention during Firmware Upgrade feature for Series-2 devices. Added support for the xG2D device family.	Added API for EM4 GPIO retention during Firmware Upgrade.	Fixed a boot hardfault caused by power loss during the AXiP erase phase.	None
Security	6.0.0	Jan 22, 2026	Release Notes	Added support for the Key Storage Unit (KSU) in the PSA Crypto API.	None	None	None
Micrium OS	6.0.0	Jan 22, 2026	Release Notes	Restricted Micrium OS usage to Series 2 devices.	None	None	None
CPC	4.8.0	Jan 22, 2026	Release Notes	Soft reset capability for future usage. SPI driver maintenance: removed legacy MMLDMA workaround.	None	CPC daemon CLI fixes for WSTK IP handling and configuration parsing.	None
MVP Math Library	6.0.0	Jan 22, 2026	Release Notes	None	None	None	None
RAIL Library	3.0.0	Jan 22, 2026	Release Notes	None	None	None	None

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.

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#

Contact Silicon Labs Support.
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SDK Release and Maintenance Policy#

See our SDK Release and Maintenance Policy.