As Olafur says it is Intel's way of using its Optane flash drives in raid configuration. It is also used with NVMe M.2 flash arrays for booting.
Set it to AHCI and hope the driver chip is recognised by OS2AHCI.ADD. If it is an Intel chip it will be recognised, if it is an ASMedia, or one of the OEM chips they build for AMD Ryzen, forget about it - it won't work.