SDAA516 August   2026 AM620-Q1 , AM623 , AM625-Q1 , AM62A1-Q1 , AM62A3-Q1 , AM62A7-Q1 , AM62D-Q1 , AM62L , AM62P-Q1 , DRA821U-Q1 , DRA829V-Q1 , TDA4AEN-Q1 , TDA4AH-Q1 , TDA4AL-Q1 , TDA4AP-Q1 , TDA4APE-Q1 , TDA4VE-Q1 , TDA4VEN-Q1 , TDA4VH-Q1 , TDA4VL-Q1 , TDA4VP-Q1 , TDA4VPE-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Purpose
    2. 1.2 Scope
  5. 2Detailed Description
    1. 2.1 AM62Ax QSPI Boot Overview
      1. 2.1.1 Boot Preconditions
      2. 2.1.2 Boot ROM Read Sequence
    2. 2.2 Flash Addressing Architecture
      1. 2.2.1 3-Byte Addressing Mode
      2. 2.2.2 4-Byte Addressing Mode
      3. 2.2.3 State Retention Behavior
    3. 2.3 Boot Compatibility Considerations
      1. 2.3.1 Boot ROM Expectations
      2. 2.3.2 Addressing-Mode Mismatch Mechanism
      3. 2.3.3 Start-Up Impact
    4. 2.4 Example Start-Up Investigation
      1. 2.4.1 External Failure Symptoms
      2. 2.4.2 Boot ROM Log Analysis
      3. 2.4.3 Memory Verification Using CCS
      4. 2.4.4 Image Comparison
      5. 2.4.5 QSPI Bus Analysis
      6. 2.4.6 Root Cause Confirmation
    5. 2.5 Debug Methodology
    6. 2.6 Mitigation and Design Recommendations
      1. 2.6.1 Preferred Solution: Flash Reset Synchronization
      2. 2.6.2 Alternative Solution: Driver-Level Mitigation
      3. 2.6.3 Applicability of the 0x6C Mitigation
      4. 2.6.4 Design Constraints for Large-Capacity Flash Applications
  6. 3Summary
  7. 4References

2.3.3 Start-Up Impact

The addressing-mode mismatch introduces a data displacement in the image loaded by the Boot ROM.

In the investigated system, image content became shifted by one byte. As a result, the certificate header contained in tiboot3.bin is no longer located at the expected offset, causing certificate authentication to fail even though the original image and certificate remained valid.

The resulting failure sequence is shown in Figure 2-3.

Impact of Flash Addressing-Mode Retention on the Boot Process Figure 2-3 Impact of Flash Addressing-Mode Retention on the Boot Process