In this guide, we will step-by-step guide you to use OPTTool (a software application) to burn OTP bits on SP7350 platforms.
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1. Prerequisites:
Before proceeding, ensure that you have compiled your SP7350 code to support the OTPTool.
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The status window of OTPTool indicates "CONNECT Success!" as shown above.
3 OTPTool operations:
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The status window of OTPTool indicates "READ Start..…” and then “READ Success!" as shown above.
3.3 Write to OTP bits
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The status window of the OTPTool indicates "WRITE Start..…” and then “WRITE Success!" as shown above.
Press 'Read' to read back content of OTP.
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The status window of the OTPTool indicates "READ Start..…” and then “READ Success!" as shown above.
4.2 Write device private key (for decryption) into OTP bit 768 ~ 1023
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The status window of the OTPTool indicates "WRITE Start..…” and then “WRITE Success!" as shown above.
Press 'Read' to confirm the content of OTP.
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The status window of the OTPTool indicates "READ Start..…” and then “READ Success!" as shown above.
4.3 Enable secure mode of SP7350 (Write 1 into OTP bit 0)
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The status window of the OTPTool indicates "READ Start..…” and then “READ Success!" as shown above.
4.4 Enable MP bit of SP7350 (Write 1 into OTP bit 2)
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Modify bit 2 to 1 and then press "Write."
4.5 Important Notes:
Do not enable the MP bit for version A chips.
Burning OTP bits is irreversible, and incorrect burns may render the chips unusable.
Remember to save the keys in designated directories (hsm_keys, otp_Sb_keys, and otp_Device_keys).