Simplicity SDK Platform - Bootloader Version 3.2.1 - Release Notes (Mar 25, 2026)#
Simplicity SDK Platform Version 6.0.1
The Gecko Bootloader is a common bootloader framework used across modern Silicon Labs MCUs and wireless SoCs. It offers configurable features such as device initialization and secure firmware updates.
Release Summary#
Key Features | API Changes | Bug Fixes | Chip Enablement
Key Features#
Added in 3.2.1#
Added support for the BRD4278A evaluation board.
Added support for the BGM27 device family.
Improved Delta DFU NVM usage by storing delta update metadata in RAM instead of NVM.
Added in 3.2.0#
EM4 GPIO retention during Firmware Upgrade for Series-2 devices.
Added support for the xG2D device family.
API Changes#
None.
Bug Fixes#
Fixed in 3.2.1#
Fixed incorrect handling of application version dependency when the running application version cannot be read.
Fixed in 3.2.0#
Fixed a boot hardfault caused by power loss during the AXiP erase phase.
Chip Enablement#
None.
Key Features#
Gecko Bootloader has been updated to support the latest devices, enabling bootloading functionality on the latest hardware platforms. It now includes the ability to parse GBL version 4 files, ensuring compatibility with the latest firmware formats. Sample applications demonstrating these features are included in the SDK.
New Features | Enhancements | Removed Features | Deprecated Features
New Features#
Added in 3.2.1#
Added support for the BRD4278A evaluation board.
Added support for the BGM27 device family to ensure bootloader sample applications appear in Simplicity Studio.
Added in 3.2.0#
EM4 GPIO retention during Firmware Upgrade for Series-2 devices.
Added support for the xG2D device family.
Enhancements#
Added in 3.2.1#
Improved Delta DFU NVM usage by storing delta update information in RAM instead of non-volatile memory (NVM), eliminating the need for an NVM staging area and reducing firmware update memory footprint.
Added in 3.2.0#
None.
Removed Features#
None.
Deprecated Features#
None.
API Changes#
New APIs | Modified APIs | Removed APIs | Deprecated APIs
New APIs#
Added in 3.2.1#
None.
Added in 3.2.0#
New API Signature | Deprecated API replaced by this (if any) |
|---|---|
bootloader_rebootAndInstallWithGpioRetention() | None |
Modified APIs#
None.
Removed APIs#
None.
Deprecated APIs#
None.
Bug Fixes#
Fixed in 3.2.1#
| ID | Issue Description | GitHub / Salesforce Reference (if any) | Affected Software Variants, Hardware, Modes, Host Interfaces |
|---|---|---|---|
| 1564299 | Resolved an issue where versionDependencyResultApp could report an incorrect value when the running application version was unavailable. The storage bootloader now tracks application version availability using appVersionAvailable and enforces version dependency checks only when the application version is successfully read. | None |
None |
Fixed in 3.2.0#
| ID | Issue Description | GitHub / Salesforce Reference (if any) | Affected Software Variants, Hardware, Modes, Host Interfaces |
|---|---|---|---|
| 1521516 | Resolved an issue where loss of power during the AXiP erase phase could leave the application region partially erased and incorrectly treated as valid, resulting in a hardfault on boot. The bootloader now detects this state and reliably re-enters firmware-upgrade mode for seamless recovery. | None |
None |
Chip Enablement#
None.
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 Limitation#
None.