Simplicity SDK Platform - Platform MCU Version 6.1.0 - Release Notes (Jun 23, 2026)#

Simplicity SDK Platform Version 6.1.0

Release Summary#

Key Features | API Changes | Bug Fixes | Chip Enablement

Key Features#

Added in 6.1.0#

ARM CMSIS: Upgraded from CMSIS 5.8 to CMSIS 6.2.
Toolchains: Updated GCC to 14.2 Rel1 and IAR to 9.70.4. IAR support extended to SiXG301 (Series 3) devices.
sl_main: New app_init_post_platform application hook for initialization that depends on platform components, drivers, and services but must run before stacks are initialized.
DMA: Added dma_channel driver and dma_manager service. DMADRV is deprecated.

API Changes#

New: sl_main app_init_post_platform() application hook.
New: I2C_SlaveAddressGetShifted() and I2C_SlaveAddressSetShifted() in EMLIB I2C.

Bug Fixes#

Fixed in 6.1.0#

sl_status: Moved constant char arrays to flash memory rather than RAM.
mic: Fixed driver init and deinit issues related to DMA channel allocation.
pwm: Updated RGB LED PWM driver compatibility for Series 3 devices.
NVM: Updated NVM operations to use non-cacheable data-alias to avoid L1ICACHE returning outdated cached data.
EFP: Updated the EFP driver core component to depend on gpiointerrupt and set its priority in the driver initialization sequence.
app_log: Updated app_log_validation.lua to support RTT stream type.
I2CSPM: Added I2C3 instance support.
Security: Addressed Fortify SCA reported issues.
SPIDRV : Disable non-EM2-capable EUSART instances before low-energy mode to prevent MOSI line glitches.

Chip Enablement#

Added in 6.1.0#

Added Lion Rev2 (EFR32BG29/EFR32MG29) OPN and radio board support.

Added EFR32FG2D (Serval GA) and WPK Main Board (BRD4002B) support.

Key Features#

New Features | Enhancements | Removed Features | Deprecated Features

New Features#

Added in 6.1.0#

Evaluation-quality services (Added in 6.1.0)#

The following platform services are included in this release at evaluation quality. Customers may use them for early evaluation.

Debug Logger: Logger support added (evaluation quality).
Watchdog Manager: Watchdog manager support added (evaluation quality).
sl_main: Added a new app_init_post_platform application hook in sl_main_second_stage_init, called after sl_platform_init, sl_driver_init, and sl_service_init complete and before sl_stack_init. This hook lets applications run initialization that depends on platform components, drivers, and services but must run before stacks are initialized.
Linker: Added support for RAM-only execution for provisioning applications (GCC toolchain).
Startup code: Added an assembly reset handler trampoline so safe code can execute before the C environment is loaded.

Enhancements#

Added in 6.1.0#

ARM CMSIS: Upgraded from CMSIS 5.8 to CMSIS 6.2.
CMSIS Device: Removed FLUSHRANGE bit in L2CACHE for SiXG301 (Series 3) devices (not supported).
Toolchains: Updated GCC from 12.2.1 to 14.2 Rel1 and IAR from 9.40.1 to 9.70.4.
IAR: IAR 7.40.4 supported. IAR support extended to SiXG301 (Series 3) devices.
DMA: SPIDRV and UARTDRV upgraded to use the dma_channel driver and dma_manager service.
Linker: memory_flash_start may now be specified without memory_flash_size; the application uses the remaining flash. The same applies to memory_ram_start and memory_ram_size.
Sleeptimer: Project generation now displays a warning when Sleeptimer is selected over PRORTC and RAIL is present in the project.
Interrupt Manager: The interrupt_manager_hooks component is now visible and user-selectable in Studio. The component enables ISR entry and exit hooks to be contributed via template contributions.

Removed Features#

None.

Deprecated Features#

Deprecated in 6.1.0#

DMADRV: The DMADRV component and all DMADRV APIs are now deprecated. Do not use them in new designs. 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. These components provide the supported DMA API for Series 2 and Series 3 devices. For the complete mapping, see the DMADRV Migration Guide and the Deprecated APIs table below.
sl_system_implementation_kernel: Deprecated. Its dependencies were already deprecated. Use sl_main instead.

API Changes#

New APIs | Modified APIs | Removed APIs | Deprecated APIs

New APIs#

Added in 6.1.0#


New API Signature	Deprecated API replaced by this (if any)
`void` `app_init_post_platform(void)`	None
`uint8_t` `I2C_SlaveAddressGetShifted(I2C_TypeDef *i2c)`	None
`void` `I2C_SlaveAddressSetShifted(I2C_TypeDef *i2c, uint8_t addr)`	None
`sl_status_t` `sl_dma_manager_init(sl_dma_handle_t *dma_handle, sl_peripheral_dma_t dma_peripheral)`	`DMADRV_Init`
`sl_status_t` `sl_dma_manager_get_default_handle(sl_dma_handle_t **dma_handle)`	None
`sl_status_t` `sl_dma_manager_allocate_channel(sl_dma_handle_t dma_handle, uint8_t channel_nbr)`	`DMADRV_AllocateChannel`
`sl_status_t` `sl_dma_manager_allocate_channel_with_properties(sl_dma_handle_t dma_handle, uint32_t channel_properties, uint8_t channel_nbr)`	`DMADRV_AllocateChannel`
`sl_status_t` `sl_dma_manager_reserve_channel(sl_dma_handle_t *dma_handle, uint8_t channel_nbr)`	`DMADRV_AllocateChannelById`
`sl_status_t` `sl_dma_manager_free_channel(sl_dma_handle_t *dma_handle, uint8_t channel_nbr)`	`DMADRV_FreeChannel`
`sl_status_t` `sl_dma_manager_allocate_sync(sl_dma_handle_t dma_handle, uint8_t sync_nbr)`	None
`sl_status_t` `sl_dma_manager_free_sync(sl_dma_handle_t *dma_handle, uint8_t sync_nbr)`	None
`sl_status_t` `sl_dma_manager_register_channel_irq_callback(sl_dma_handle_t *dma_handle, uint8_t channel_nbr, sl_dma_manager_channel_irq_callback_t callback)`	None
`sl_status_t` `sl_dma_manager_register_channel_user_data(sl_dma_handle_t dma_handle, uint8_t channel_nbr, void user_data)`	None
`sl_status_t` `sl_dma_manager_retrieve_current_channel_user_data(uint8_t channel_nbr, void *user_data)`	None
`uint32_t` `sl_dma_manager_get_pending_errors(uint8_t channel_nbr)`	None
`void` `sl_dma_manager_clear_pending_errors(uint8_t channel_nbr)`	None
`sl_status_t` `sl_dma_channel_handle_alloc(sl_dma_channel_handle_t **handle)`	None
`sl_status_t` `sl_dma_channel_handle_free(sl_dma_channel_handle_t *handle)`	None
`size_t` `sl_dma_channel_handle_get_size(void)`	None
`sl_status_t` `sl_dma_channel_init(sl_dma_channel_handle_t handle, sl_peripheral_t peripheral, uint8_t channel_number, sl_dma_channel_callback_t callback, void user_data)`	None
`sl_status_t` `sl_dma_channel_deinit(sl_dma_channel_handle_t *handle)`	None (per-channel teardown; `DMADRV_DeInit` was whole-driver)
`sl_status_t` `sl_dma_channel_set_peripheral_signal(const sl_dma_channel_handle_t *handle, sl_dma_signal_t signal)`	None
`sl_status_t` `sl_dma_channel_descriptor_alloc(const sl_dma_channel_handle_t handle, sl_dma_channel_xfer_descriptor_t *descriptor)`	None
`sl_status_t` `sl_dma_channel_descriptor_free(const sl_dma_channel_handle_t handle, sl_dma_channel_xfer_descriptor_t descriptor)`	None
`size_t` `sl_dma_channel_descriptor_get_size(void)`	None
`sl_status_t` `sl_dma_channel_submit_transfer_m2m(sl_dma_channel_handle_t handle, void source, void destination, size_t size, sl_dma_channel_xfer_descriptor_t descriptor)`	None
`sl_status_t` `sl_dma_channel_submit_transfer_m2p(sl_dma_channel_handle_t handle, void source, void reg, size_t size, sl_dma_ctrl_size_t unit_size, sl_dma_channel_xfer_descriptor_t descriptor)`	`DMADRV_MemoryPeripheral`
`sl_status_t` `sl_dma_channel_submit_transfer_p2m(sl_dma_channel_handle_t handle, void reg, void destination, size_t size, sl_dma_ctrl_size_t unit_size, sl_dma_channel_xfer_descriptor_t descriptor)`	`DMADRV_PeripheralMemory`
`sl_status_t` `sl_dma_channel_submit_transfer_list(sl_dma_channel_handle_t handle, sl_dma_channel_transfer_t list_head)`	None
`sl_status_t` `sl_dma_channel_submit_ping_pong_transfer_m2p(sl_dma_channel_handle_t handle, void source, void source_2, void destination, size_t size, sl_dma_ctrl_size_t unit_size, sl_dma_channel_xfer_descriptor_t *descriptor)`	`DMADRV_MemoryPeripheralPingPong`
`sl_status_t` `sl_dma_channel_submit_ping_pong_transfer_p2m(sl_dma_channel_handle_t handle, void source, void destination, void destination_2, size_t size, sl_dma_ctrl_size_t unit_size, sl_dma_channel_xfer_descriptor_t *descriptors)`	`DMADRV_PeripheralMemoryPingPong`
`sl_status_t` `sl_dma_channel_submit_triple_buffered_transfer_m2p(sl_dma_channel_handle_t handle, void source, void source_2, void source_3, void destination, size_t size, sl_dma_ctrl_size_t unit_size, sl_dma_channel_xfer_descriptor_t descriptors)`	None
`sl_status_t` `sl_dma_channel_submit_triple_buffered_transfer_p2m(sl_dma_channel_handle_t handle, void source, void destination, void destination_2, void destination_3, size_t size, sl_dma_ctrl_size_t unit_size, sl_dma_channel_xfer_descriptor_t descriptor)`	None
`sl_status_t` `sl_dma_channel_update_active_transfer(sl_dma_channel_handle_t *handle, size_t new_size)`	None
`sl_status_t` `sl_dma_channel_abort(sl_dma_channel_handle_t *handle)`	`DMADRV_StopTransfer`
`sl_status_t` `sl_dma_channel_suspend(const sl_dma_channel_handle_t *handle)`	`DMADRV_PauseTransfer`
`sl_status_t` `sl_dma_channel_resume(const sl_dma_channel_handle_t *handle)`	`DMADRV_ResumeTransfer`
`sl_status_t` `sl_dma_channel_get_status(sl_dma_channel_handle_t handle, sl_dma_channel_status_t status)`	`DMADRV_TransferActive`, `DMADRV_TransferDone`, `DMADRV_TransferCompletePending`, `DMADRV_TransferRemainingCount`

Modified APIs#

None.

Removed APIs#

None.

Deprecated APIs#

Deprecated in 6.1.0#

The following DMADRV APIs are deprecated and replaced by the DMA Manager (dma_manager) and DMA Channel Driver (dma_channel). They remain functional in this release. See the DMADRV Migration Guide for the full mapping.


Deprecated API Signature	Replacement API	Planned Removal
`Ecode_t` `DMADRV_Init(void)`	`sl_dma_manager_init`	June 2027
`Ecode_t` `DMADRV_DeInit(void)`	No direct equivalent. Tear down each channel with `sl_dma_channel_deinit`, then release it with `sl_dma_manager_free_channel`.	June 2027
`Ecode_t` `DMADRV_AllocateChannel(unsigned int channelId, void capabilities)`	`sl_dma_manager_allocate_channel` / `sl_dma_manager_allocate_channel_with_properties`	June 2027
`Ecode_t` `DMADRV_AllocateChannelById(unsigned int channelId, void *capabilities)`	`sl_dma_manager_reserve_channel`	June 2027
`Ecode_t` `DMADRV_FreeChannel(unsigned int channelId)`	`sl_dma_manager_free_channel`	June 2027
`Ecode_t` `DMADRV_MemoryPeripheral(unsigned int channelId, DMADRV_PeripheralSignal_t peripheralSignal, ...)`	`sl_dma_channel_set_peripheral_signal` + `sl_dma_channel_submit_transfer_m2p`	June 2027
`Ecode_t` `DMADRV_PeripheralMemory(unsigned int channelId, DMADRV_PeripheralSignal_t peripheralSignal, ...)`	`sl_dma_channel_set_peripheral_signal` + `sl_dma_channel_submit_transfer_p2m`	June 2027
`Ecode_t` `DMADRV_MemoryPeripheralPingPong(unsigned int channelId, DMADRV_PeripheralSignal_t peripheralSignal, ...)`	`sl_dma_channel_set_peripheral_signal` + `sl_dma_channel_submit_ping_pong_transfer_m2p`	June 2027
`Ecode_t` `DMADRV_PeripheralMemoryPingPong(unsigned int channelId, DMADRV_PeripheralSignal_t peripheralSignal, ...)`	`sl_dma_channel_set_peripheral_signal` + `sl_dma_channel_submit_ping_pong_transfer_p2m`	June 2027
`Ecode_t` `DMADRV_LdmaStartTransfer(int channelId, ...)`	Drive the channel directly through the `sl_hal_ldma` HAL after allocating it from the DMA Manager.	June 2027
`Ecode_t` `DMADRV_PauseTransfer(unsigned int channelId)`	`sl_dma_channel_suspend`	June 2027
`Ecode_t` `DMADRV_ResumeTransfer(unsigned int channelId)`	`sl_dma_channel_resume`	June 2027
`Ecode_t` `DMADRV_StopTransfer(unsigned int channelId)`	`sl_dma_channel_abort`	June 2027
`Ecode_t` `DMADRV_TransferActive(unsigned int channelId, bool *active)`	`sl_dma_channel_get_status`	June 2027
`Ecode_t` `DMADRV_TransferCompletePending(unsigned int channelId, bool *pending)`	No direct equivalent. The DMA Channel Driver delivers completion through the callback registered with `sl_dma_channel_init`; polling for a pending interrupt is no longer required.	June 2027
`Ecode_t` `DMADRV_TransferDone(unsigned int channelId, bool *done)`	`sl_dma_channel_get_status`	June 2027
`Ecode_t` `DMADRV_TransferRemainingCount(unsigned int channelId, int *remaining)`	`sl_dma_channel_get_status` reports `bytes_completed` (cumulative). Compute remaining as `transfer_size - bytes_completed`.	June 2027

Bug Fixes#

Fixed in 6.1.0#

ID	Issue Description	GitHub / Salesforce Reference (if any)	Affected Software Variants, Hardware, Modes, Host Interfaces
Common / Build
1528902	Security: Addressed Fortify SCA reported issues.	00334559	All
1632474	app_log: Updated app_log_validation.lua script to support RTT stream type.	00340619	All
Services
1564149	sl_status: Modified the constant char arrays in sl_status.c to use flash memory rather than RAM.	00334831	All
1589197	NVM: Updated the code to use non-cacheable data-alias (0x6100_0000-0x67FF_FFFF) for all NVM operations to avoid L1ICACHE returning outdated cached data from 0x0100_0000-0x04FF_FFFF.	None	SiXG301 devices
1633904	EFP: Updated the EFP driver core component to depend on gpiointerrupt and set its priority in the driver initialization sequence.	00340925	All
1589194	Clock Manager: Added atomic sections around SE Manager function calls during Clock Manager initialization to prevent calls to `sli_se_execute_and_wait()` before `sl_se_init()`.	00338665	All
1574895	Memory Manager: Fixed an issue in the statistics APIs where the reported used heap value could underflow.	None	All
1574016	Memory Manager: Fixed an issue where freeing the same memory pool allocation twice would corrupt the memory pool, making it impossible to delete the memory pool.	None	All
Peripherals
1573843	mic: Fixed mic driver init and deinit issues related to DMA channel allocation.	00335348	All
1611330	pwm: Updated the compatibility of the PWM driver to support Series 3 devices.	00339649	SiXG301 devices
1575696	I2CSPM: Added the I2C3 instance support in I2CSPM.	None	All
1601391	SPIDRV: SPIDRV now disables non-EM2-capable EUSART instances before going into low-energy mode to prevent potential glitches on the MOSI line.	00338193	All
1577673	hal_ldma: Multiple inlined functions of `sl_hal_ldma` used in the DMADRV interrupt handler were not placed in RAM for Series 3; they are now correctly placed in RAM.	None	SiXG301 devices
1563576	hal_ldma: Cleared the CHDONE flag for a given channel before starting a new transfer with the `sl_hal_ldma_start_transfer()` API.	None	All

Chip Enablement#

Added in 6.1.0#

Chip Family	OPNs / Boards / OPN Combinations	Supported Software Variants (if applicable)	Supported Modes	Supported Host Interfaces
EFR32BG29	OPN: EFR32BG29B230F1024CM40 OPN: EFR32BG29B220F1024CJ45 OPN: EFR32BG29B140F1024IM40 OPN: EFR32BG29B221F1024CJ45 Board: BG29-RB4420A Board: xG29-RB4412A	All	All	All
EFR32MG29	OPN: EFR32MG29B230F1024CM40 OPN: EFR32MG29B140F1024IM40 Board: xG29-RB4412A	All	All	All

Added in 6.0.2#

Chip Family	OPNs / Boards / OPN Combinations	Supported Software Variants (if applicable)	Supported Modes	Supported Host Interfaces
EFR32FG2D	OPN: EFR32FG2DB010F512IM48 OPN: EFR32FG2DB020F512IM48 OPN: EFR32FG2DB010F512IM40 OPN: EFR32FG2DA010F256IM40 OPN: EFR32FG2DA020F256IM48 OPN: EFR32FG2DA010F256IM48 Board: BRD4277A Board: BRD4278A Board: BRD2611A	All	All	All
WPK Main Board	Board: BRD4002B	All	All	All

Added in 6.0.1#

None.

Added in 6.0.0#

Chip Family	OPNs / Boards / OPN Combinations	Supported Software Variants (if applicable)	Supported Modes	Supported Host Interfaces
EFR32FG23L	OPN: EFR32FG23L010F128GM40 OPN: EFR32FG23L020F128GM40	All	All	All
EFR32FG2D	OPN: EFR32FG2DB010F512IM48 Board: BRD4277A	All	All	All
BGM270S	OPN: BGM270SC22SNA4	All	All	All
MGM270S	OPN: MGM270SC22SNA4 Board: BRD2715A Board: BRD4356A	All	All	All

Application Example Changes#

New Examples | Modified Examples | Removed Examples | Deprecated Examples

New Examples#

None.

Modified Examples#

None.

Removed Examples#

None.

Deprecated Examples#

None.

Known Issues and Limitations#

ID Issue or Limitation Description GitHub / Salesforce Reference (if any) Workaround (if any) Affected Software Variants, Hardware, Modes, Host Interfaces

None

ID	Issue or Limitation Description	GitHub / Salesforce Reference (if any)	Workaround (if any)	Affected Software Variants, Hardware, Modes, Host Interfaces
None	Some variants of the ARM GCC 14.2.rel1 toolchain for Windows and macOS (Apple Silicon) were built without ZSTD compression support. LTO-enabled libraries built on the Linux version of the toolchain use ZSTD compression and are not compatible with the ARM-released toolchains on these platforms. Customers who choose to use the official ARM GCC release on these platforms should be aware that enabling LTO may result in a link-time error.	None	Silicon Labs provides a fixed GCC 14.2 Rel1 toolchain for Windows and macOS (Apple Silicon), built from the same source as the ARM release but with ZSTD support included. The fixed toolchain identifies itself as `Build silabs-14.2.rel1-b66` in the version output and is distributed through the Silicon Labs package manager (Simplicity Installer / SLT).	Windows and macOS (Apple Silicon). GCC toolchain with LTO enabled.
None	Applications that initialize `osThreadAttr_t` with the deprecated `.reserved` member must remove it from initializer lists. This release includes a union-based compatibility layer to ease migration when the deprecated `.reserved` member is still referenced.	None	Remove the deprecated `.reserved` member from `osThreadAttr_t` initializer lists.	Applications using ARM CMSIS 6.2 that still initialize `osThreadAttr_t` with the deprecated `.reserved` member.
1675728	Saving the memory layout in Simplicity Studio v6 Memory Editor writes `memory_ram_start` and related fields to the project `.slcp` file but omits `memory_ram_alias_start`. GCC project generation on SiXG301 devices then fails with a linker script template error (`%x format: an integer is required, not Undefined`).	None	Edit the project `.slcp` file and add `memory_ram_alias_start` under `template_contribution`. Use the alias that matches the security view of `memory_ram_start`: `8388608` (`0x00800000`, Non-Secure / `device_ram_alias_addr_ns`) when `memory_ram_start` is in the Non-Secure RAM range (for example `536870912` / `0x20000000`); `276824064` (`0x10800000`, Secure / `device_ram_alias_addr_s`) when `memory_ram_start` is in the Secure RAM range (for example `805306368` / `0x30000000`). If RAM start was offset from the device default, use `memory_ram_alias_start = alias_base + (memory_ram_start - ram_base)`. Regenerate the project.	SiXG301 device family. GCC toolchain. Simplicity Studio v6 Memory Editor.

Some variants of the ARM GCC 14.2.rel1 toolchain for Windows and macOS (Apple Silicon) were built without ZSTD compression support. LTO-enabled libraries built on the Linux version of the toolchain use ZSTD compression and are not compatible with the ARM-released toolchains on these platforms.

Customers who choose to use the official ARM GCC release on these platforms should be aware that enabling LTO may result in a link-time error.

None

Silicon Labs provides a fixed GCC 14.2 Rel1 toolchain for Windows and macOS (Apple Silicon), built from the same source as the ARM release but with ZSTD support included. The fixed toolchain identifies itself as Build silabs-14.2.rel1-b66 in the version output and is distributed through the Silicon Labs package manager (Simplicity Installer / SLT).

Windows and macOS (Apple Silicon). GCC toolchain with LTO enabled.

None

Applications that initialize osThreadAttr_t with the deprecated .reserved member must remove it from initializer lists. This release includes a union-based compatibility layer to ease migration when the deprecated .reserved member is still referenced.

None

Remove the deprecated .reserved member from osThreadAttr_t initializer lists.

Applications using ARM CMSIS 6.2 that still initialize osThreadAttr_t with the deprecated .reserved member.

1675728

Saving the memory layout in Simplicity Studio v6 Memory Editor writes memory_ram_start and related fields to the project .slcp file but omits memory_ram_alias_start. GCC project generation on SiXG301 devices then fails with a linker script template error (%x format: an integer is required, not Undefined).

None

Edit the project .slcp file and add memory_ram_alias_start under template_contribution.

Use the alias that matches the security view of memory_ram_start: 8388608 (0x00800000, Non-Secure / device_ram_alias_addr_ns) when memory_ram_start is in the Non-Secure RAM range (for example 536870912 / 0x20000000); 276824064 (0x10800000, Secure / device_ram_alias_addr_s) when memory_ram_start is in the Secure RAM range (for example 805306368 / 0x30000000).

If RAM start was offset from the device default, use memory_ram_alias_start = alias_base + (memory_ram_start - ram_base). Regenerate the project.

SiXG301 device family. GCC toolchain. Simplicity Studio v6 Memory Editor.