The RISCV_VIRT_CODE.fd file provides UEFI firmware for a QEMU guest that is
intended to be read-only. The RISCV_VIRT_VARS.fd file provides UEFI variable
template images which are intended to be read-write, and therefore each
guest should be given its own copy.

Below you can find an example how to invoke QEMU to boot from a disk
image (disk.img).

The variables data base is copied so that it can be written to.

By default the EDK II virt machine provides ACPI tables and no device-tree.
The parameter acpi=off is used to provide a device-tree instead.

cp /usr/share/qemu-efi-riscv64/RISCV_VIRT_VARS.fd .
qemu-system-riscv64 \
  -M virt,acpi=off -m 4096 -smp 4 \
  -serial mon:stdio \
  -device virtio-gpu-pci \
  -device qemu-xhci \
  -device usb-kbd \
  -device usb-mouse \
  -drive \
  if=pflash,format=raw,unit=0,file=/usr/share/qemu-efi-riscv64/RISCV_VIRT_CODE.fd,readonly=on
\
  -drive if=pflash,format=raw,unit=1,file=RISCV_VIRT_VARS.fd \
  -drive file=disk.img,format=raw,if=virtio \
  -device virtio-net-device,netdev=net0 \
  -device virtio-rng-pci \
  -netdev user,id=net0

If you only need a serial console, you could use:

qemu-system-riscv64 \
  -M virt,acpi=off -m 4096 -smp 4 \
  -nographic \
  -drive \
  if=pflash,format=raw,unit=0,file=/usr/share/qemu-efi-riscv64/RISCV_VIRT_CODE.fd,readonly=on
\
  -drive if=pflash,format=raw,unit=1,file=RISCV_VIRT_VARS.fd \
  -drive file=disk.img,format=raw,if=virtio \
  -device virtio-net-device,netdev=net0 \
  -device virtio-rng-pci \
  -netdev user,id=net0

On the serial console press the ESC key twice to reach the EDK II menu
during the count down.

 -- dann frazier <dannf@debian.org>, Sun, 29 Oct 2023 19:11:14 -0600