I was advised in the IRC room to send this here.
Attempting to boot install79.img on my system with an RX9070 has
no video output, with the following errors in the dmesg log

amdgpu0 at pci8 dev 0 function 0 "ATI Navi 48" rev 0xc3
drm0 at amdgpu0
amdgpu0: msi
drm:pid0:amdgpu_device_ip_early_init *ERROR* early_init of IP block <psp> failed -19
drm:pid0:amdgpu_device_ip_early_init *ERROR* early_init of IP block <smu> failed -19
drm:pid0:amdgpu_device_ip_early_init *ERROR* early_init of IP block <dm> failed -19
drm:pid0:amdgpu_device_ip_early_init *ERROR* early_init of IP block <gfx_v12_0> failed -19
[drm] *ERROR* Failed to init sdma firmware!
drm:pid0:amdgpu_device_ip_early_init *ERROR* early_init of IP block <sdma_v7_0> failed -19
drm:pid0:amdgpu_device_ip_early_init *ERROR* early_init of IP block <vcn_v5_0_0> failed -19
drm:pid0:amdgpu_device_ip_early_init *ERROR* early_init of IP block <mes_v12_0> failed -19
drm:pid0:amdgpu_driver_load_kms *ERROR* Fatal error during GPU init

Moving up to the current snapshot of install80.img renders the system unbootable.
When drm starts, the system blanks and reboots, without any drop into ddb on panic.
Unfortunately, the nature of the error means I do not have any real
information to provide, my apologies.