As far as I can see that device isn't currently supported.
The current (as in git head) ahci driver source code shows AMD devices up to 0x43b6, but doesn't cover 0x43f6 and shouldn't be attaching to it.
{0x43b61022, 0x00, "AMD X399", 0},
{0x43b51022, 0x00, "AMD 300 Series"...