TIDUEY4E August   2022  – November 2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Building Blocks
      2. 2.2.2 Flash Partitioning
      3. 2.2.3 LFU Switchover Concepts
      4. 2.2.4 Application LFU Flow
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Software Requirements
      1. 3.2.1 Software Package Contents
      2. 3.2.2 Software Structure
    3. 3.3 Introduction to the TIDM-DC-DC-BUCK
    4. 3.4 Test Setup
      1. 3.4.1 Loading the Custom Bootloader and Application to Flash using CCS
    5. 3.5 Test Results
      1. 3.5.1 Running the LFU Demo with Control Loop Running on the CPU
      2. 3.5.2 Running the LFU Demo with Control Loop Running on the CLA
      3. 3.5.3 LFU Flow on the CPU
      4. 3.5.4 LFU Flow on the CLA
      5. 3.5.5 Limitations and Key Concerns
      6. 3.5.6 Preparing Firmware for LFU
      7. 3.5.7 LFU Compiler Support
      8. 3.5.8 Robustness
      9. 3.5.9 LFU Use-Cases
  10. 4FOTA Example
    1. 4.1 Abstract
    2. 4.2 Introduction
    3. 4.3 Hardware Requirements
    4. 4.4 Software Requirements
    5. 4.5 Running the example
  11. 5Design and Documentation Support
    1. 5.1 Software Files
    2. 5.2 Documentation Support
    3. 5.3 Support Resources
    4. 5.4 Trademarks
  12. 6Terminology
  13. 7About the Author
  14. 8Revision History

1 System Description

In applications similar to server power supply, metering, and so on, the system is desired to be run continuously to reduce downtime. But typically, during firmware upgrades, due to bug fixes, new features, and or performance improvements, the system is removed from service causing downtime for associated entities as well. This can be handled with redundant modules but with an increase in total system cost. An alternate approach, called Live Firmware Update (LFU), allows updating the firmware while the system is still operating. Switching to new firmware can be done either with or without resetting the device, with the latter being more complex.

This reference guide presents details on LFU without Device Reset using two Flash banks on a TMS320F28003x or TMS320F28004x device, detailing the specific challenges involved and suggestions on how to address them. LFU is implemented on the C2000™ Digital Power Buck Converter BoosterPack reference design. The document illustrates LFU capabilities with the main control loop running on either the C28x CPU or the CLA.