Simplicity SDK Platform Version 6.1.2 - Release Notes (Oct 14, 2026)#

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

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Release Summary#

Release Item	Version	Release Date	Release Notes	Key Features	API Changes	Bug Fixes	Chip Enablement
Platform MCU	6.1.2	Oct 14, 2026	Release Notes	None.	None.	Fixed linker and power manager issues for Series 3 external flash and TCXO clock configurations. Fixed issues in the DMA Channel Driver and HAL drivers (ACMP and EUSART). Fixed identification of the SIMG301M104XIL and SIBG301M104XIL parts in Simplicity Studio.	Added support for BRD2610A. Added support for BRD2608B, BRD2601D, BRD2602B, BRD2603C, BRD2600C, BRD2503C, BRD2504B, and BRD2506B.
Bootloader	3.3.2	Oct 14, 2026	Release Notes	None.	None.	Fixed an issue in Delta DFU where the bootloader read metadata from Slot 0 instead of the firmware slot being updated. Fixed GBL tag-order handling when an SE upgrade was combined with an unencrypted application and SE upgrade no-staging was enabled. Added the missing documentation entry for the bootloader_app_properties component.	Added bootloader support for BRD2608B, BRD2602B, BRD2600C, and BRD2603C. Added support for the bootloader-spi-ezsp application on xG2B OPNs and radio boards.
Security	6.1.2	Oct 07, 2026	Release Notes	None.	None.	Fixed an issue in the PSA driver for AES encryption on HSE devices where a memcpy() call could read beyond the input buffer when the data length was not a multiple of 16 bytes.	None.
Micrium OS	6.1.1	Jul 29, 2026	Release Notes	None.	None.	Corrected the Micrium OS Studio configuration option names `BSP_LF_CLK_SEL` and `CPU_CFG_CACHE_MGMT_EN`.	None.
CPC	4.9.2	Oct 14, 2026	Release Notes	None.	None.	Fixed an issue where write completion callbacks (on_write_completed) were not invoked when the Power Manager was enabled in baremetal mode, because sl_cpc_is_ok_to_sleep() allowed sleep while deferred work was still pending.	None.
RAIL Library	3.1.1	Oct 14, 2026	Release Notes	None.	None.	None.	None.

Impact of Release Changes#

Impact Statements | Migration Guide

Impact Statements#

Item	Impact
ARM CMSIS 6.2 upgrade	The `osThreadAttr_t` structure replaces the `reserved` member with `affinity_mask`. Applications that initialize `.reserved` in `osThreadAttr_t` initializer lists must remove it. This release includes a union-based compatibility layer to ease migration when the deprecated `.reserved` member is still referenced. Do not initialize `.reserved` or `.affinity_mask` to 0; omit these members and rely on implicit zero-initialization for const structs with static storage.
GCC 14.2 Rel1	GCC updated from 12.2.1 to 14.2 Rel1. On Windows and macOS (Apple Silicon), use the Silicon Labs-provided GCC 14.2 Rel1 toolchain to build with LTO-enabled SDK libraries. Using the ARM-released GCC toolchain on these platforms with LTO enabled may result in link-time errors.
IAR 9.70.4	IAR updated from 9.40.1 to 9.70.4. Rebuild all projects after upgrading the toolchain.
LLVM 21.1.1	LLVM 21.1.1 is now available as a supported compiler for Series 2 and Series 3 platform applications. Rebuild all projects after upgrading the toolchain.

Migration Guide#

ARM CMSIS 6.2 migration:

Remove the .reserved member from all osThreadAttr_t initializer lists. Only initialize members that require non-zero or non-NULL values.

Example:

static const osThreadAttr_t thread_attributes = {
  .name       = "app",
  .stack_size = 3072,
  .priority   = osPriorityLow,
};static const osThreadAttr_t thread_attributes = {
  .name       = "app",
  .stack_size = 3072,
  .priority   = osPriorityLow,
};

Compiler upgrade:
- Rebuild all projects after upgrading to GCC 14.2 Rel1, IAR 9.70.4, or LLVM 21.1.1.
- On Windows and macOS (Apple Silicon), install the Silicon Labs-provided GCC 14.2 Rel1 toolchain through Simplicity Installer / SLT when building with LTO.
DMADRV: The DMADRV component and all DMADRV APIs are now deprecated. They remain functional in this release and are scheduled for removal in the future. For new designs, use the dma_manager service and the dma_channel driver. Software components that previously used the DMADRV API, including SPIDRV and UARTDRV, have been migrated to the dma_manager service and dma_channel driver in this release. For more information, see the DMADRV Migration Guide.

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.

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Select Notifications from the dropdown menu.
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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.