esp-idf/components/fatfs/test_apps/flash_ro/README.md

Supported Targets	ESP32	ESP32-C2	ESP32-C3	ESP32-C5	ESP32-C6	ESP32-H2	ESP32-P4	ESP32-S2	ESP32-S3

This test app runs a few FATFS test cases in a read-only FAT partition.

These tests should be possible to run on any ESP development board, not extra hardware is necessary.

The initial FAT image is generated during the build process in main/CMakeLists.txt:

• create_test_files function creates a set of files expected by the test cases
• fatfs_create_rawflash_image generates a FAT image from the set of files (via fatfsgen.py)

The generated FAT image is flashed into storage partition when running idf.py flash.

See ../README.md for more information about FATFS test apps.