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This is to allow having pre IDF v4.3 behavior where "encrypted"
flag was not being checked for NVS partitions.
It is recommended to enable this new config only if you have
production devices where NVS partition was being set with "encrypted"
flag by mistake.
Please see commit aca9ec28b3 which
introduced check to not allow NVS partitions with "encrypted" flag set.
More discussion on this at:
https://github.com/espressif/esp-idf/issues/5747#issuecomment-956223024
https://github.com/espressif/esp-idf/issues/7839#issuecomment-961477667
Closes https://github.com/espressif/esp-idf/issues/7839
Closes IDFGH-6162
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.