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spi_flash: add a new feature to read the unique id of the flash chip Closes IDFGH-2085 See merge request espressif/esp-idf!11421
See the spi_flash.rst in the programming guide folder for more details. The docs above is for the new SPI Flash API above 4.0, for legacy implementation (CONFIG_SPI_FLASH_USE_LEGACY_IMPL enabled), read README_legayc.rst in the same folder with this readme.