SDAA436 September   2026 AM62L

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction to Human Machine Interface
  5. 2 Introduction to AM62L
  6. 3 Demo Overview
    1. 3.1 Background
  7. 4 Methods to Reduce Active Power
    1. 4.1 Light Weight Graphics Application
    2. 4.2 Minimal Linux Device Tree
    3. 4.3 Local Power Sleep Controller (LPSC)
    4. 4.4 Reducing Clock Frequencies
    5. 4.5 Auto Clock Gating
    6. 4.6 DDR in Auto Self-Refresh
    7. 4.7 Performance
  8. 5 Demo Specific Optimizations
    1. 5.1 LVGL Application
    2. 5.2 Minimal Device Tree
    3. 5.3 Slow Clock Speed
    4. 5.4 Slow A53 Core Clock Frequency
    5. 5.5 Turn Off One A53 Core
    6. 5.6 Slow DDR Transfer Speed
    7. 5.7 DDR Auto Self-Refresh
    8. 5.8 Auto Clock Gating
    9. 5.9 Slow Panel FPS
  9. 6 Power Data
  10. 7 Implementing Low Powers Modes within an HMI Use Case
  11. 8 Demo Steps
    1. 8.1 System Requirements
    2. 8.2 Prepare the SD Card
      1. 8.2.1 Build the Required Files
        1. 8.2.1.1 Boot Images
        2. 8.2.1.2 U-Boot Commands
        3. 8.2.1.3 GUI Files
        4. 8.2.1.4 Kernel Image, Modules, and Device Tree
        5. 8.2.1.5 Scripts
    3. 8.3 Run the Demo
  12. 9 Summary
  13. 10References
  14. 11Appendix
    1. 11.1  Display Image
    2. 11.2  Minimal Device Tree Patch
    3. 11.3  Slow Clock Frequencies
    4. 11.4  Slow DDR Speed to 800 MT/s Patch
    5. 11.5  Enable Auto Self Refresh for DDR
    6. 11.6  Enable Auto Clock Gating
    7. 11.7  Slow Panel Pixel Clock by Half Patch
    8. 11.8  U-Boot Commands
    9. 11.9  Enable All Power Optimizations and Run lvglsim Binary
    10. 11.10 RPI Touch Display Troubleshooting

5.2 Minimal Device Tree

The minimal device tree removes all nodes that are not necessary for the demo's functionality and removes the corresponding pins that had been configured in the PinMux. SeeAppendix 11.2 for the patch of the minimal device tree.