armsr: enable framebuffer emulation for virtio-gpu/drm displays
This was discovered when trying to run OpenWrt on Hetzner Cloud's
Arm-based instances.
Hetzner uses QEMU/KVM with virtio-gpu as the main display device,
together with an ACPI firmware. This was not displaying a console
previously.
This setup can be emulated by qemu using options below:
qemu-system-aarch64 \
-machine virt \
-bios QEMU_EFI.fd \
-device virtio-gpu \
-usb \
-device qemu-xhci,id=xhci \
-device usb-tablet,bus=xhci.0 \
-device usb-kbd,bus=xhci.0 \
-vnc :0
Signed-off-by: Mathew McBride <[email protected]>
Mathew McBride