SDAA376 August   2026 DRA821U-Q1 , DRA829J-Q1 , DRA829V-Q1 , TDA4AH-Q1 , TDA4AL-Q1 , TDA4AP-Q1 , TDA4APE-Q1 , TDA4VE-Q1 , TDA4VH-Q1 , TDA4VL-Q1 , TDA4VM , TDA4VM-Q1 , TDA4VP-Q1 , TDA4VPE-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
    1. 1.1 Why Keywriter is Needed
    2. 1.2 What is Keywriter
  5. 2Keywriter Certificate Blob
    1. 2.1 Certificate Generation Overview
  6. 3Production Deployment Methods
    1. 3.1 OSPI Boot Method
    2. 3.2 eMMC Boot Method
    3. 3.3 eMMC Boot with DFU Backup Method
    4. 3.4 JTAG/Development Boot Method
    5. 3.5 RGMI Ethernet Boot Mode
  7. 4Updates in the Field
    1. 4.1 SWREV (Software Revision)
    2. 4.2 KEYREV (Key Revision)
  8. 5Common Debugging Steps
    1. 5.1 Dry-Run Testing
    2. 5.2 Package Requirements
    3. 5.3 eFuse Programming Setup
    4. 5.4 Verifying Programming Results
    5. 5.5 Boot Failure Troubleshooting
    6. 5.6 Trace Collection Without Wakeup UART
  9. 6Summary
  10. 7References

5.4 Verifying Programming Results

  • Successful eFuse programming returns debug response 0x0. Obtain the R5 keywriter application logs on MCU UART. The following reference logs show successful key provisioning.
OTP Keywriter Version: 02.00.00.00 (Jul 19 2023 - 11:15:35)
OTP Keywriter ver: 9.0.7-v09.00.07 (Kool Koala)
OTP_VppEn
WKUP_GPIO0_54 output high
Key programming sequence initiated
Taking OTP certificate from 0x41c7f004
Debug response: 0x0
Key programming sequence completed
  • Non-zero responses indicate errors. See the TISCI Documentation for specific error code details.