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In this guide, we will step-by-step guide you to use OPT Tool (a software application) to burn OTP bits on SP7350 platforms.

1. Prerequisites:

Before proceeding, ensure that you have compiled your SP7350 code to support the OTP Tool.

Please confirm that the OTP driver in X-Boot is enabled. For guidance, refer to the screenshot below:

2. UART connection setup

2.1 Close terminal applications

Close terminal applications such as Putty to free up the COM port connected to the SP7350 platform.

2.2 Run OTP Tool

Launch "OTP Tool.exe" on your PC. Once started, the application interface will be displayed as shown below:

2.3 Configure COM port

Set the COM port connected to the SP7350 platform. Refer to screenshot below:

For instance, if UART0 of the SP7350 platform is linked to COM5 on your PC, select COM5 and set the Baudrate to 115200. Refer to screenshot below:

Press OK.

2.4 Connect with SP7350 platform

Click "Connect" button in the OTP Tool and power on the SP7350 platform.

The status window of OTP Tool indicates "CONNECT Success!" as shown above.

3 OTP Tool operations:

3.1 Open Excel file (OTP table)

Open the OTP table Excel file. Refer to screenshot below:

When Open diaglog box is displayed, select the Excel file "OTP_TABLE_QAK654.xls". Then, press OK button. Refer to screenshot below, OTP table are loaded successfully.

3.2 Read and modify OTP bits

Press "Read" button to read the content of OTP from the SP7350 platform. Refer to screenshot below, Read command completed successfully.

The status window of OTP Tool indicates "READ Start…” and next “READ Success!" as shown above.

3.3 Write to OTP bits

For modifications, right-click on the relevant bit or bit range, select "Modify item":

Input the new value, and press OK.

After making all necessary modifications, click "Write" to write the changes to the OTP of the SP7350 platform. Refer to screenshot below, bit [543:512] is updated:

4. Burning secure-boot and device keys:

For additional security features:

  1. Burn Secure-Boot Public Key (For Digital Signature): Write the secure-boot public key into OTP[765 ~ 512]. Follow the provided steps, ensuring the correct conversion and input of the key.

  2. Burn Device Private Key (For Decryption): Write the device private key into OTP[1023 ~ 768]. Follow the provided steps, ensuring the correct conversion and input of the key.

Important Notes:

  • Burning OTP bits is irreversible, and incorrect burns may render the IC unusable.

  • Save the keys in designated directories (hsm_keys, otp_Sb_keys, and otp_Device_keys).

Follow these steps diligently to successfully utilize the OTP Tool and enhance the security features of your SP7350 platform.

Burn secure-boot and device Keys

  1. Write Secure-Boot Public Key (For Digital Signature): Write the secure-boot public key into OTP[765 ~ 512]. Follow the provided steps, ensuring the correct conversion and input of the key.

  2. Write Device Private Key (For Decryption): Write the device private key into OTP[1023 ~ 768]. Follow the provided steps, ensuring the correct conversion and input of the key.

  3. Write 1 to OTP[0]: Write the value '1' to OTP[0]. Ensure not to enable the HWLOCK_MP_ENABLE bit.

Note:

  • Burning the keys (OTP) is irreversible. Incorrectly burned keys will render the IC unusable.

  • Save the keys in the directories: hsm_keys, otp_Sb_keys, and otp_Device_keys.

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