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That's VERY interesting, Kit! Thanks! Your library makes a clever use of the GPIO_DSET and GPIO_DCLR registers of the SoC chipset, which by itself makes the write operation atomic.
So, to answer the OP, the Omega2 does have the bit-banding memory-map feature for GPIOs. If the fast-gpio functions are well designed, there's no reason why they shouldn't be atomic (but again, I have not seen those specific source code yet to confirm or refute their atomicity).
