Otpbin Seeprombin Upd [OFFICIAL]

| Pitfall | Mitigation | |---------|-------------| | OTP misprogramming | Simulate OTP write in test mode first, use checksum validation | | SEEPROM wear-out | Implement wear-leveling or use FRAM instead | | Power loss during update | Use dual-image + recovery bootloader, store update progress in SEEPROM | | Signature bypass | Lock OTP read access, enable secure boot in hardware |

// Update procedure using OTPBin and SEEPROMBin
int perform_update(const uint8_t* new_firmware, uint32_t size) 
    // 1. Verify signature using OTP-stored public key
    if (!verify_signature(new_firmware, size, OTP_PUBKEY_ADDR)) 
        return -1; // Invalid signature
// 2. Read current version from SEEPROMBin
uint32_t current_ver = seeprom_read(UPDATE_VERSION_ADDR);
uint32_t new_ver = get_firmware_version(new_firmware);
if (new_ver <= current_ver) 
    return -2; // Rollback prevented
// 3. Write new firmware to application area
flash_erase(APP_START_ADDR);
flash_write(APP_START_ADDR, new_firmware, size);
// 4. Update SEEPROMBin with new version and status
seeprom_write(UPDATE_VERSION_ADDR, new_ver);
seeprom_write(UPDATE_STATUS_ADDR, UPDATE_SUCCESS);
// 5. Reset device
system_reset();
return 0;

OTPBIN refers to a binary file (.bin) that contains data intended to be written into One-Time Programmable (OTP) memory. OTP memory is a non-volatile memory type that can be programmed exactly once. After programming, the data is永久 (permanent) and cannot be altered or erased. otpbin seeprombin upd