X11 Configuration for AMD RX 6600

Hi, I'm trying to get my RX 6600 to work under OpenBSD, and am failing miserably. No matter what I put into /etc/X11/xorg.conf, it always says "no devices found" and "no screens found" I don't see any GPU-related errors in dmesg, so am I just doing it wrong? I've tried creating a Device, Screen,

Asynchronous write()/send()?

le? I installed the POSIX manpages and I can see aio stuff there, but it tells me to include a header that gcc and clang won't find. Apparently FreeBSD has aio_write(), but seemingly OpenBSD doesn't. What are the alternatives? Is there really no way to do this? Best, illegalcoding