Over-the-Air Download (OAD)

The following sections aim to describe the lower layers of OAD software that are common across all protocol stack implementations. This includes the OAD image header, the flash layout, Boot Image Manager, and the oad_image_tool.

Warning

The Z-Stack OAD does not implement or perform any security or authentication mechanisms as part of the firmware update process. System developers should take measures to adequately authenticate peer devices and only accept and/or apply firmware images transferred from trusted sources via OAD.

When using the Secure OAD feature along with recommended parameters, firmware images are authenticated on the device using ECDSA signature validation algorithms to ensure image authenticity prior to updating the running firmware image.

• Introduction
  • OAD Topology Overview
• OAD Storage & Security
  • OAD Storage
  • OAD Security
• Boot Image Manager (BIM)
  • Overview & Software Architecture
  • Boot procedure
    • Device trim
    • Halt In Boot (HIB)
  • Secure BIM
  • Locating and Preparing a user application
• BIM for Off-Chip OAD
• OAD Image Header
  • OAD Image Header Overview
  • OAD Core Image Header
    • OAD Image Identification Value
    • CRC
    • BIM Version
    • Image Header Version
    • Wireless Technology
    • Image Information
    • Image Validation
    • Image Length
    • Program Entry Address
    • Software version
    • Image End Address
    • Header Length
  • OAD Image Header segments
    • Segment Header
      • Segment Type
      • Wireless Technology
      • Reserved
      • Payload Length
    • Boundary Information Segment
      • Stack Entry Address
      • Stack Boundary Address (ICALL_STACK0_ADDR)
      • Lower RAM Boundary (RAM_START_ADDR)
      • Upper RAM Boundary (RAM_END_ADDR)
    • Contiguous Image Information Segment
      • Image Start Address
    • Security Information Segment
      • Verification status
      • Security Version
      • Security Timestamp
      • Certificate Payload
• OAD External Flash Image Header
  • Additional Fields in External Flash Image Header
• Flash Layout for Off-Chip OAD
  • Constraints and Requirements for Off-chip OAD
  • Internal Flash Memory Layout
  • External Flash Memory Layout
• OAD Image Tool
  • Running the tool
  • Running the Tool from Source
  • Generating New Security Keys (Embedded)
  • Required Arguments/Getting Help

Please reference the BLE-5 Stack User’s Guide and corresponding Simplelink Academy for information on creating a production image for OAD applications.