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Currently, we pull up cs io for spi flash/ram to reduce current leakage during light sleep. But some kind of spi flash/ram chip need all io pull up. Otherwise, current leakage will still exist.
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.