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doc(flash): updated 32bit addr support doc

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armando
2025-07-02 10:20:00 +08:00
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docs/en/api-reference/peripherals/spi_flash/spi_flash_optional_feature.rst
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@@ -164,17 +164,21 @@ Restrictions
.. important::
Over 16 MB space on flash mentioned above can be only used for ``data saving``, like file system.
The part of flash above 16 MB can be used for data storage, for example using a file system.
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.
.. only:: SOC_SPI_MEM_SUPPORT_CACHE_32BIT_ADDR_MAP
By default, space over 16 MB on flash mentioned above can be used for ``data saving``, like file system.
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.
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``.
*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``:
- :ref:`CONFIG_IDF_EXPERIMENTAL_FEATURES`
- :ref:`CONFIG_BOOTLOADER_CACHE_32BIT_ADDR_QUAD_FLASH`
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>`_.
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>`_.
For Octal flash chips, this feature is enabled by default if :ref:`CONFIG_ESPTOOLPY_OCT_FLASH` is enabled.
.. _oct-flash-doc: