We are now on Quartus 24.3 and attempting to start using FreeRTOS. I think we see the same issue as original poster.
When generating the BSP for a Nios V + FreeRTOS project, only the altera_avalon_uart and altera_avalon_jtag_uart drivers are available in the generated BSP. No other drivers, such as SPI, I2C, PIO are present. However the two drivers which are copied build succesfully.
Meanwhile on Quartus 23.4 as suggested -- the drivers are copied, but the BSP has build errors regarding OS_FLAG_etc not found.
From my perspective FreeRTOS is not possible to use with NiosV. Do you have any suggestion?