AMD Fakeraid and Debian?

I can't get my (AMD-based) BIOS RAID to work with either Debian or Ubuntu. With my BIOS in AHCI mode, I successfully detect all drives; however, in RAID mode, all SATA drives disappear, and I can only see my NVMe card. I've set dmraid=true, but I still have no luck. Anyone else have any success with AMD BIOS RAID on Debian/Debian based distros? Is this a problem with just my motherboard?