In this guide, we will step-by-step guide you to use OPT Tool (a software application) to burn OTP bits on SP7350 platforms.
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The status window of OTP Tool indicates "CONNECT Success!" as shown above.
3 OTP Tool operations:
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The status window of OTP Tool indicates "READ Start…” and next “READ Success!" as shown above.
3.3 Write to OTP bits
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4. Burning secure-boot and device keys:
For additional security features:
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SP7350 supports secure-boot. To enable secure-boot, you need to build code with security enabled and write secure keys into OTP of SP7350. There are two keys defined in OTP. One is secure-boot key and the other is device key. Each key is 32 bytes long. Secure-boot key is for digital signature. Device key is for decrypting image.
4.1 Burn secure-boot public key (for digital signature) into OPT bit 765 ~ 512
Secure-boot key is stored in file build/tools/secure_hsm/secure/otp_Sb_keys/ed_pub_0.hex:
7BBBCF06A44BA7655540A7F8AD5176F4BCA83F00E63442A7BA0C4F5D8BBCF650
Convert key to little-endian 4-byte word.
OTP[543:512] = 06CFBB7B OTP[575:544] = 65A74BA4 OTP[607:576] = F8A74055 OTP[639:608] = F47651AD OTP[671:640] = 003FA8BC OTP[703:672] = A74234E6 OTP[735:704] = 5D4F0CBA OTP[767:736] = 50F6BC8B
Input key to OTP words one by one, and then check and then press "Write"
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You can press 'Read' to read back content of OTP.
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4.2 Write device private key (for decryption) into OTP bit 1023 ~ 768
Device private key is stored in hex file build/tools/secure_hsm/secure/otp_Device_keys/x_priv_0.hex:
583D94
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Convert key to little-endian 4-byte word.
OTP[799:768] = 79943D58OTP[831:800] = 29520D76
| Code Block |
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OTP[863:832] = 01461A61
OTP[895:864] = 0EE81ECB
OTP[927:896] = E17B0C2C
OTP[959:928] = 37C6F4E8
OTP[991:960] = D572EAA9
OTP[1023:992] = 5CB2A3A5 |
OTP[799:768] = 79943D58
OTP[831:800] = 29520D76
OTP[863:832] = 01461A61
OTP[895:864] = 0EE81ECB
OTP[927:896] = E17B0C2C
OTP[959:928] = 37C6F4E8
OTP[991:960] = D572EAA9
OTP[1023:992] = 5CB2A3A5
Follow the provided steps, ensuring the correct conversion and input of the key.
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.
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