Bootloader v4.1.3

Changes:

• Update Mbed OS to 5.15.2
• Allow boot messages on SWO instead of serial port.
• Disable standard output to save code size.
• Don't check boot counter on software reset.
• Allow configuring alternate entry point for bootloader instead of main.
• Add support for DISCO_F769NI.
• Add configuration for MIMXRT1050_EVK.
• Add configuration for L496AG.
• Add configuration for Uhuru Raven.
• Add configuration for Renesas GR-PEACH and LYCHEE.
• Add configuration for EP_AGORA target.
• Drop block_device_fake_rot.json configuration file.
• Allow specifying a startup delay before initializing storage hardware.
• NRF52840_DK: Adds information about UICR registers
• NRF52840_DK: Adds as release target and adds a new app config
• Small code cleanup and refactoring

Bootloader v4.1.2

Changes:

• Update Mbed OS to 5.15.0
• Build using Link-Time-Optimization
• Add internal no-ROT config for Nucleo H743ZI2
• Drop firmware update test code from sources
• Drop runSizeTestAndGenerateGraph.sh as the information is already provided Mbed OS
• Better Python3 support
• DISCO_F746NG - internal flash support
• Add NUCLEO_L4R5ZI - internal flash

Bootloader v4.1.1

Changes:

• Add NUCLEO F303RE internal kvstore with spif to release.
• Update Mbed OS to mbed-os-5.14.1

Bootloader support for Mbed OS 5.13

New features

• Build against Mbed OS 5.13.0
• Add configuration for KVStore on SPIF
• Support NUCLEO_F303RE

Improvements

• Documentation updates
• NUCLEO_F303RE Limit binary size to 36KB
• Support DISCO_L475VG_IOT01A using external QSPIF storage
• Small bugfixes

v4.0.2 - mbed-os 5.12.3 and PSA targets support

New Features

• Update mbed-os to 5.12.3
• Add new target support:
  • DISCO_L475VG_IOT01A to internal flash configuration
  • CY8CKIT_062_WIFI_BT_PSA and CY8CKIT_062_BLE
  • LPC55S69_NS
• Add support for PSA targets
• Add an option to conditionally disable serial output

Improvements:

• SHA256 optimization

v4.0.1 - KVStore storage

New Features

• Root of trust is stored in KVStore on internal flash.
• ARM_UCP_FLASHIAP_BLOCKDEVICE update storage option uses the Mbed OS's default blockdevice for firmware storage.
• Updated Mbed OS to 5.11.5.
• Added configurations for K64F and K66F to use internal flash firmware storage and KVStore for Pelion Device Management Client.

Improvements

• Bootloader no longer depends on Pelion Device Management Client. All files needed from PDMC have been put under the new modules folder.
• Removed dependency on external sd-driver repo. The bootloader now uses sd-driver included in mbed-os.
• Configuration is consolidated and it is now easier to add new devices to the config files.
• Fixed compiler warnings.

Important Note

• KVStore is not backward compatible with previous storage configurations. If your RoT is retrieved from NVStore/SOTP, please use bootloader v3.x.x.

v3.5.0 - New Mbed OS, New Boards

New Features

• Update mbed-os to 5.10.0
• Update cloud client dependency to 2.0.1.1
• Add configuration for NUCLEO_F303RE, NUCLEO_F207ZG, DISCO_L475VG_IOT01A, and NRF52840_DK

v3.4.0

New Features

• Add configuration file for a bootloader with default RoT and internal flash firmware storage for Nucleo_F429ZI and K64F
• Application start address can be configured independently of application jump address to support cases where the vector table is not at the start of the firmware image.
• Active Metadata Header is no longer required to be directly in front of the the active application. It's location can be independently configured.
• Add configuration for new platforms: NRF52, NUCLEO_F411RE

Improvements

• Upgrade to mbed-os-5.9.4
• Downgrade to sd-driver-0.1.2 to reduce binary size
• Use NVSTORE API shipped with Mbed-OS instead of SOTP API to retrieve the Root of Trust.
• Clean up configuration
• Guard sd block device instantiation so that when internal flash firmware storage is used, all sd-driver code can be linked out.
• Clean up coding style to conform to mbed-os coding style.
• Wrap ARM_UCP_FLASHIAP_BLOCKDEVICE so that it only contains the necessary read functions. This reduces binary size.

Important Note

• SOTP is being replaced with NVSTORE which is shipped in Mbed-OS. As NVSTORE is binary compatible with SOTP there is no breakage. The configuration of offsets are still be the same.
• In order to keep bootloader size to a minimum, please use latest arm-none-eabi-gcc. Current version is tested with version 7.3.1 which produces binary size smaller than 32k for K64F, UBLOX_EVK_ODIN_W2 and NUCLEO_F429ZI.

v3.3.0 - A Compact and Secure bootloader built using Mbed OS for Mbed Cloud

Features

Security

• Verifies integrity of firmware candidate before performing update.
• Verifies integrity of active firmware before boot
• Secure firmware candidate off-chip using HMAC protected firmware header
• Prevents rollback by rejecting any firmware with smaller version number than active firmware

Reliability

• Resilient against power cut.

Portability

• Built using mbed-os to 5.7.2, portable across mbed-os supported boards
• Supports multiple firmware storage media including filesystem, sd-blockdevice and internal flash.
• Flexible active firmware placement configurable at compile time.

Compact

• Less than 32k of binary size on most mbed-os supported platforms.
• By default use SD blockdevice to store firmware candidates
• Compile without RTOS and most of mbed-os features
• Use size optimised minimal-printf library
• Enable nano.specs for GCC
• Use a size optimised configuration file for mbedtls