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Copy file name to clipboardExpand all lines: docs/en/api-reference/peripherals/spi_flash/spi_flash_optional_feature.rst
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@@ -164,17 +164,21 @@ Restrictions
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.. important::
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Over 16 MB space on flash mentioned above can be only used for ``data saving``, like file system.
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The part of flash above 16 MB can be used for data storage, for example using a file system.
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Mapping data/instructions to 32-bit physical address space (so as to be accessed by the CPU) needs the support of MMU. However {IDF_TARGET_NAME} doesn't support this feature. Only ESP32-S3 and ESP32-P4 supports this up to now.
By default, space over 16 MB on flash mentioned above can be used for ``data saving``, like file system.
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For Quad flash chips, by default, the part of flash above 16 MB can be used for data storage, for example using a file system.
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Furthermore, to map data/instructions to 32-bit physical address space (so as to be accessed by the CPU), please enable the config ``IDF_EXPERIMENTAL_FEATURES`` and ``BOOTLOADER_CACHE_32BIT_ADDR_QUAD_FLASH``.
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*Experimental Feature*: To enable full support for Quad flash addresses above 16MB (for both code execution and data access), enable this experimental feature by setting below options to ``y``:
Please note that, this option is experimental, which means that it can not be used on all flash chips stably. For more information, please contact `Espressif's business team <https://www.espressif.com/en/contact-us/sales-questions>`_.
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Please note that, this option is experimental, which means that it can not be used on all Quad flash chips stably. For more information, please contact `Espressif's business team <https://www.espressif.com/en/contact-us/sales-questions>`_.
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For Octal flash chips, this feature is enabled by default if :ref:`CONFIG_ESPTOOLPY_OCT_FLASH` is enabled.
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