Harman reports the Flash option is not available for Main R5F_0_0 in following e2e thread
AUDIO-AM275-EVM: The generated codes of ospi_flash_io and hello_world are different for ti_board_open_close.h/.c - Harman Sitara MPU Forum - Harman Automotive - TI E2E support forums
Even though the readme.html for OSPI Flash I/O example claims r5fss0-0 is supported:
Supported Combinations
| Parameter |
Value |
| CPU + OS |
wkup-r5fss0-0_freertos |
| r5fss0-0 freertos |
| c75ss0-0 freertos |