esp-idf/examples/system/base_mac_address/main/Kconfig.projbuild

menu "Example Configuration"

    choice BASE_MAC_ADDRESS_STORAGE
        prompt "Storage location of the base MAC address"
        default BASE_MAC_STORED_EFUSE_BLK0
        help
            Select the storage location of the base MAC addresses.
            1. eFuse BLK0: The "Default (Espressif factory)" selection. The
            default base MAC address is written to words 1 and 2 of eFuse block
            0 when the chip was manufactured. Call esp_efuse_mac_get_default()
            read retrieve the "eFuse BLK0" MAC address.
            2. eFuse BLK3: A custom base MAC address is burned by the user into
            eFuse word 0 of block 3. Call esp_efuse_mac_get_custom() to read
            the "eFuse BLK3" MAC address.
            3. Other External Storage: Selecting this option will cause the
            example to call external_storage_mac_get() which is defined in this
            example to simply return a MAC address preset in software. Users
            should modify this function to access their desired storage mediums
            (e.g. flash, EEPROM etc).

        config BASE_MAC_STORED_EFUSE_BLK0
            bool "Default (Espressif factory) eFuse BLK0"
        config BASE_MAC_STORED_EFUSE_BLK3
            bool "Custom eFuse BLK3"
        config BASE_MAC_STORED_OTHER_EXTERNAL_STORAGE
            bool "Other external storage"
    endchoice

    choice BASE_MAC_STORED_EFUSE_BLK3_ERROR_BEHAV
        prompt "Behavior when retrieving eFuse BLK3 fails"
        depends on BASE_MAC_STORED_EFUSE_BLK3
        default BASE_MAC_STORED_EFUSE_BLK3_ERROR_DEFAULT
        help
            Select the behavior when reading base MAC address "eFuse BLK3" fails
            (i.e. the retrieved result is all 0).
            - If "Abort" is selected, the ESP32 will abort.
            - If "Use the default base MAC address from BLK0 of eFuse" is
            selected, the default "eFuse BLK0" will be used instead.

        config BASE_MAC_STORED_EFUSE_BLK3_ERROR_ABORT
            bool "Abort"
        config BASE_MAC_STORED_EFUSE_BLK3_ERROR_DEFAULT
            bool "Use the default base MAC address eFuse BLK0"
    endchoice

endmenu