esp-idf/components/spi_flash/Kconfig

menu "SPI Flash driver"
    depends on !APP_BUILD_TYPE_PURE_RAM_APP

    config SPI_FLASH_VERIFY_WRITE
        bool "Verify SPI flash writes"
        depends on !SPI_FLASH_ROM_IMPL
        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 n
        help
            This option enables the following APIs:

            - esp_flash_reset_counters
            - esp_flash_dump_counters
            - esp_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 should be enabled, if any one of the following is true: (1) need to write
            to flash on ESP32-D2WD; (2) main SPI flash is connected to non-default pins; (3) main
            SPI flash chip is manufactured by ISSI.

    config SPI_FLASH_ROM_IMPL
        bool "Use esp_flash implementation in ROM"
        depends on ESP_ROM_HAS_SPI_FLASH
        default n
        help
            Enable this flag to use new SPI flash driver functions from ROM instead of ESP-IDF.

            If keeping this as "n" in your project, you will have less free IRAM.
            But you can use all of our flash features.

            If making this as "y" in your project, you will increase free IRAM.
            But you may miss out on some flash features and support for new flash chips.

            Currently the ROM cannot support the following features:

            - SPI_FLASH_AUTO_SUSPEND (C3, S3)

    choice SPI_FLASH_DANGEROUS_WRITE
        bool  "Writing to dangerous flash regions"
        default SPI_FLASH_DANGEROUS_WRITE_ALLOWED if APP_BUILD_TYPE_RAM
        default SPI_FLASH_DANGEROUS_WRITE_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_DANGEROUS_WRITE_ABORTS
            bool "Aborts"
        config SPI_FLASH_DANGEROUS_WRITE_FAILS
            bool "Fails"
        config SPI_FLASH_DANGEROUS_WRITE_ALLOWED
            bool "Allowed"
    endchoice

    config SPI_FLASH_SHARE_SPI1_BUS
        bool  "Support other devices attached to SPI1 bus"
        default n
        depends on IDF_TARGET_ESP32
        select SPI_MASTER_ISR_IN_IRAM
        help
            Each SPI bus needs a lock for arbitration among devices. This allows multiple
            devices on a same bus, but may reduce the speed of esp_flash driver access to the
            main flash chip.

            If you only need to use esp_flash driver to access the main flash chip, disable
            this option, and the lock will be bypassed on SPI1 bus. Otherwise if extra devices
            are needed to attach to SPI1 bus, enable this option.

    config SPI_FLASH_BYPASS_BLOCK_ERASE
        bool "Bypass a block erase and always do sector erase"
        default n
        help
            Some flash chips can have very high "max" erase times, especially for block erase (32KB or 64KB).
            This option allows to bypass "block erase" and always do sector erase commands.
            This will be much slower overall in most cases, but improves latency for other code to run.

    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.
            Please use this configuration together with ``SPI_FLASH_ERASE_YIELD_DURATION_MS`` and
            ``SPI_FLASH_ERASE_YIELD_TICKS`` after carefully checking flash datasheet to avoid a
            watchdog timeout.
            For more information, please check `SPI Flash API` reference documenation
            under section `OS Function`.

    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) for an erase operation"
        depends on SPI_FLASH_YIELD_DURING_ERASE
        default 1
        help
            Defines how many ticks will be before returning to continue a erasing.

    config SPI_FLASH_SUSPEND_QVL_SUPPORTED
        # Internally usage
        bool
        default y if IDF_TARGET_ESP32C3 || IDF_TARGET_ESP32S3 || IDF_TARGET_ESP32C2
        default n

    config SPI_FLASH_AUTO_SUSPEND
        bool "Auto suspend long erase/write operations (READ DOCS FIRST)"
        default n
        depends on SPI_FLASH_SUSPEND_QVL_SUPPORTED && !SPI_FLASH_ROM_IMPL
        help
            This option is default n because it can't be used in every situation. You need to
            evaluate this feature through suspend part in `SPI Flash API` document.

            CAUTION: If you want to OTA to an app with this feature turned on, please make
            sure the bootloader has the support for it. (later than IDF v4.3)

            Auto-suspend feature only supported by specific flash chips.
            If you are using an official module, please contact Espressif Business support.
            Also reading auto suspend part in `SPI Flash API` document before you enable this function.

    config SPI_FLASH_WRITE_CHUNK_SIZE
        int "Flash write chunk size"
        default 8192
        range 256 8192
        help
            Flash write is broken down in terms of multiple (smaller) write operations.
            This configuration options helps to set individual write chunk size, smaller
            value here ensures that cache (and non-IRAM resident interrupts) remains
            disabled for shorter duration.

    config SPI_FLASH_SIZE_OVERRIDE
        bool "Override flash size in bootloader header by ESPTOOLPY_FLASHSIZE"
        default n
        help
            SPI Flash driver uses the flash size configured in bootloader header by default.
            Enable this option to override flash size with latest ESPTOOLPY_FLASHSIZE value from
            the app header if the size in the bootloader header is incorrect.

    config SPI_FLASH_CHECK_ERASE_TIMEOUT_DISABLED
        bool "Flash timeout checkout disabled"
        default n
        help
            This option is helpful if you are using a flash chip whose timeout is quite large or unpredictable.

    config SPI_FLASH_OVERRIDE_CHIP_DRIVER_LIST
        bool "Override default chip driver list"
        default n
        help
            This option allows the chip driver list to be customized, instead of using the default list provided by
            ESP-IDF.

            When this option is enabled, the default list is no longer compiled or linked. Instead, the
            `default_registered_chips` structure must be provided by the user.

            See example: custom_chip_driver under examples/storage for more details.

    menu "SPI Flash behavior when brownout"

        config SPI_FLASH_BROWNOUT_RESET_XMC
            bool "Enable sending reset when brownout for XMC flash chips"
            default y
            select SPI_FLASH_BROWNOUT_RESET
            help
                When this option is selected, the patch will be enabled for XMC.
                Follow the recommended flow by XMC for better stability.

                DO NOT DISABLE UNLESS YOU KNOW WHAT YOU ARE DOING.

        config SPI_FLASH_BROWNOUT_RESET
            bool
            default y
            select ESP_SYSTEM_BROWNOUT_INTR
            help
                When brownout happens during flash erase/write operations,
                send reset command to stop the flash operations to improve stability.

    endmenu

    menu "Auto-detect flash chips"
        visible if !SPI_FLASH_OVERRIDE_CHIP_DRIVER_LIST

        orsource "./$IDF_TARGET/Kconfig.soc_caps.in"

        config SPI_FLASH_SUPPORT_ISSI_CHIP
            bool "ISSI"
            default y if SPI_FLASH_VENDOR_ISSI_SUPPORTED
            default n
            help
                Enable this to support auto detection of ISSI chips if chip vendor not directly
                given by ``chip_drv`` member of the chip struct. This adds support for variant
                chips, however will extend detecting time.

        config SPI_FLASH_SUPPORT_MXIC_CHIP
            bool "MXIC"
            default y if SPI_FLASH_VENDOR_MXIC_SUPPORTED
            default n
            help
                Enable this to support auto detection of MXIC chips if chip vendor not directly
                given by ``chip_drv`` member of the chip struct. This adds support for variant
                chips, however will extend detecting time.

        config SPI_FLASH_SUPPORT_GD_CHIP
            bool "GigaDevice"
            default y if SPI_FLASH_VENDOR_GD_SUPPORTED
            default n
            help
                Enable this to support auto detection of GD (GigaDevice) chips if chip vendor not
                directly given by ``chip_drv`` member of the chip struct. If you are using Wrover
                modules, please don't disable this, otherwise your flash may not work in 4-bit
                mode.

                This adds support for variant chips, however will extend detecting time and image
                size. Note that the default chip driver supports the GD chips with product ID
                60H.

        config SPI_FLASH_SUPPORT_WINBOND_CHIP
            bool "Winbond"
            default y if SPI_FLASH_VENDOR_WINBOND_SUPPORTED
            default n
            help
                Enable this to support auto detection of Winbond chips if chip vendor not directly
                given by ``chip_drv`` member of the chip struct. This adds support for variant
                chips, however will extend detecting time.

        config SPI_FLASH_SUPPORT_BOYA_CHIP
            bool "BOYA"
            # ESP32 doens't usually use this chip, default n to save iram.
            default y if SPI_FLASH_VENDOR_BOYA_SUPPORTED
            default n
            help
                Enable this to support auto detection of BOYA chips if chip vendor not directly
                given by ``chip_drv`` member of the chip struct. This adds support for variant
                chips, however will extend detecting time.

        config SPI_FLASH_SUPPORT_TH_CHIP
            bool "TH"
            # ESP32 doens't usually use this chip, default n to save iram.
            default y if SPI_FLASH_VENDOR_TH_SUPPORTED
            default n
            help
                Enable this to support auto detection of TH chips if chip vendor not directly
                given by ``chip_drv`` member of the chip struct. This adds support for variant
                chips, however will extend detecting time.

        config SPI_FLASH_SUPPORT_MXIC_OPI_CHIP
            bool "mxic (opi)"
            depends on IDF_TARGET_ESP32S3
            default y
            help
                Enable this to support auto detection of Octal MXIC chips if chip vendor not directly
                given by ``chip_drv`` member of the chip struct. This adds support for variant
                chips, however will extend detecting time.

    endmenu #auto detect flash chips

    config SPI_FLASH_ENABLE_ENCRYPTED_READ_WRITE
        bool "Enable encrypted partition read/write operations"
        default y
        help
            This option enables flash read/write operations to encrypted partition/s. This option
            is kept enabled irrespective of state of flash encryption feature. However, in case
            application is not using flash encryption feature and is in need of some additional
            memory from IRAM region (~1KB) then this config can be disabled.

    config SPI_FLASH_HPM_ENABLE
        bool
        default n
        help
            This option is invisible, and will be selected automatically
            when ``ESPTOOLPY_FLASHFREQ_120M`` is selected.

    config SPI_FLASH_32BIT_ADDRESS
        bool
        default y if ESPTOOLPY_FLASHSIZE_32MB || ESPTOOLPY_FLASHSIZE_64MB || ESPTOOLPY_FLASHSIZE_128MB
        default n
        help
            This is a helper config for 32bits address flash. Invisible for users.

    config SPI_FLASH_32BIT_ADDR_ENABLE
        bool "Enable 32-bit-address (over 16MB) SPI Flash access"
        depends on SPI_FLASH_32BIT_ADDRESS && !ESPTOOLPY_OCT_FLASH && IDF_TARGET_ESP32S3 && IDF_EXPERIMENTAL_FEATURES
        default n
        help
            Enabling this option allows the CPU to access 32-bit-address flash beyond 16M range.
            1. This option only valid for 4-line flash. Octal flash doesn't need this.
            2. This option is experimental, which means it can't use on all flash chips stable, for more
            information, please contact Espressif Business support.

endmenu