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I cant seem to get this to work as after i install the drm-kmod and add kld_list="amdgpu" to rc.conf after the freebsd boot screen the monitor go blank. turning off the frame buffer doesnt help.
when I i read dmesg without the driver loaded it recogninzes it as a ryzen 3 cpu but once i load the driver the screen goes blank and I cant read the dmesg.I'm running the same APU in OpenBSD current.
My understanding is that the firmware is bundled with the module. I would review your dmesg to see if it recognized and the firmware loaded. Also /var/log/Xorg.0.log for other errors
In OpenBSD I had to tweak the mouse cursor to a software cursor but otherwise, it runs well.