esp-idf/components/spi_flash/Kconfig

menu "SPI Flash driver"

    config SPI_FLASH_VERIFY_WRITE
        bool "Verify SPI flash writes"
        default n
        help
            If this option is enabled, any time SPI flash is written then the data will be read
            back and verified. This can catch hardware problems with SPI flash, or flash which
            was not erased before verification.

    config SPI_FLASH_LOG_FAILED_WRITE
        bool "Log errors if verification fails"
        depends on SPI_FLASH_VERIFY_WRITE
        default n
        help
            If this option is enabled, if SPI flash write verification fails then a log error line
            will be written with the address, expected & actual values. This can be useful when
            debugging hardware SPI flash problems.

    config SPI_FLASH_WARN_SETTING_ZERO_TO_ONE
        bool "Log warning if writing zero bits to ones"
        depends on SPI_FLASH_VERIFY_WRITE
        default n
        help
            If this option is enabled, any SPI flash write which tries to set zero bits in the flash to
            ones will log a warning. Such writes will not result in the requested data appearing identically
            in flash once written, as SPI NOR flash can only set bits to one when an entire sector is erased.
            After erasing, individual bits can only be written from one to zero.

            Note that some software (such as SPIFFS) which is aware of SPI NOR flash may write one bits as an
            optimisation, relying on the data in flash becoming a bitwise AND of the new data and any existing data.
            Such software will log spurious warnings if this option is enabled.

    config SPI_FLASH_ENABLE_COUNTERS
        bool "Enable operation counters"
        default 0
        help
            This option enables the following APIs:

            - spi_flash_reset_counters
            - spi_flash_dump_counters
            - spi_flash_get_counters

            These APIs may be used to collect performance data for spi_flash APIs
            and to help understand behaviour of libraries which use SPI flash.

    config SPI_FLASH_ROM_DRIVER_PATCH
        bool "Enable SPI flash ROM driver patched functions"
        default y
        help
            Enable this flag to use patched versions of SPI flash ROM driver functions.
            This option is needed to write to flash on ESP32-D2WD, and any configuration
            where external SPI flash is connected to non-default pins.

    choice SPI_FLASH_WRITING_DANGEROUS_REGIONS
        bool  "Writing to dangerous flash regions"
        default SPI_FLASH_WRITING_DANGEROUS_REGIONS_ABORTS
        help
            SPI flash APIs can optionally abort or return a failure code
            if erasing or writing addresses that fall at the beginning
            of flash (covering the bootloader and partition table) or that
            overlap the app partition that contains the running app.

            It is not recommended to ever write to these regions from an IDF app,
            and this check prevents logic errors or corrupted firmware memory from
            damaging these regions.

            Note that this feature *does not* check calls to the esp_rom_xxx SPI flash
            ROM functions. These functions should not be called directly from IDF
            applications.

        config SPI_FLASH_WRITING_DANGEROUS_REGIONS_ABORTS
            bool "Aborts"
        config SPI_FLASH_WRITING_DANGEROUS_REGIONS_FAILS
            bool "Fails"
        config SPI_FLASH_WRITING_DANGEROUS_REGIONS_ALLOWED
            bool "Allowed"
    endchoice

    config SPI_FLASH_YIELD_DURING_ERASE
        bool "Enables yield operation during flash erase"
        default y
        help
            This allows to yield the CPUs between erase commands.
            Prevents starvation of other tasks.

    config SPI_FLASH_ERASE_YIELD_DURATION_MS
        int "Duration of erasing to yield CPUs (ms)"
        depends on SPI_FLASH_YIELD_DURING_ERASE
        default 20
        help
            If a duration of one erase command is large
            then it will yield CPUs after finishing a current command.

    config SPI_FLASH_ERASE_YIELD_TICKS
        int "CPU release time (tick)"
        depends on SPI_FLASH_YIELD_DURING_ERASE
        default 1
        help
            Defines how many ticks will be before returning to continue a erasing.

endmenu