![]() ![]() If not using that Secure Boot feature, they can be used for another purpose ĮFUSE_BLK3 can be partially reserved for the custom MAC address, or used entirely for user application. If not using that Flash Encryption feature, they can be used for another purpose ĮFUSE_BLK2 is used for security boot key. Some eFuse bits are available for user applications.ĮSP32 has 4 eFuse blocks each of the size of 256 bits (not all bits are available):ĮFUSE_BLK0 is used entirely for system purposes ĮFUSE_BLK1 is used for flash encrypt key. ![]() Some of system parameters are using these eFuse bits directly by hardware modules and have special place (for example EFUSE_BLK0).įor more details, see ESP32 Technical Reference Manual > eFuse Controller (eFuse). Each eFuse is a one-bit field which can be programmed to 1 after which it cannot be reverted back to 0. The ESP32 has a number of eFuses which can store system and user parameters. ![]()
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