I saw the other thread with this subject but it didn't answer all my questions.
I use a ADSP21261, disable the parallel port and use AD0-15 as GPIO pins.
So, Flag0-3 revert to their alternate functions IRQ0-2, TIMEXP.
I assume that therefore I can not use these pins as SPI slave select.
What to do, then? Can I simply use 1 or 2 of AD0-15 as SPI slave selects and set them manually during SPI operation? SPI must be core-driven, then, I assume.