I see a lot of timeouts with the graphics hardware. I recall that Radeon graphics requires downloading and installing third party firmware. But you may not be able to get this system into a state where you can install the firmware (with fw_update(8)).
Your wsdisplay(4) driver is attached via radeondrm(4). I assume that when you disabled radeondrm(4), you then lost access to wsdisplay(4). I don't see the Intel Iris video hardware in the dmesg.
In the RAMDISK kernel used for install, the radeondrm(4) driver is not configured, and for this simple, minimal system, wsdisplay(4) is attached via efifb(4).
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