qemu-steps-1st-approach

# download debian installer files
curl http://ftp.de.debian.org/debian/dists/bullseye/main/installer-armhf/current/images/netboot/initrd.gz -o installer-initrd.gz
curl http://ftp.de.debian.org/debian/dists/bullseye/main/installer-armhf/current/images/netboot/mini.iso -o mini.iso
curl http://ftp.de.debian.org/debian/dists/bullseye/main/installer-armhf/current/images/netboot/vmlinuz -o installer-vmlinuz

# create qcow2 hard-drive
qemu-img create -f qcow2 debian-hda.qcow2 8G

# run installation
qemu-system-arm -M virt -cpu cortex-a7 -m 1G -kernel installer-vmlinuz -initrd installer-initrd.gz -hda debian-hda.qcow2 -append "console=ttyAMA0" -drive file=mini.iso,id=cdrom,if=none,media=cdrom -device virtio-scsi-device -device scsi-cd,drive=cdrom -nographic -netdev user,id=mynet -device virtio-net-device,netdev=mynet

# mount qcow2 image in host system and
# copy vmlinuz-5.10.0-18-armmp-lpae and initrd.img-5.10.0-18-armmp-lpae
# see blog links for details.
# alternative approach to mount it:
# https://gist.github.com/shamil/62935d9b456a6f9877b5

# run debian after copying the two files
"C:\Program Files\qemu\qemu-system-arm.exe" -M virt -cpu cortex-a7 -m 1G -initrd initrd.img-5.10.0-18-armmp-lpae \
    -kernel vmlinuz-5.10.0-18-armmp-lpae -append "root=/dev/vda2 console=ttyAMA0" \
    -drive if=virtio,file=debian-hda.qcow2,format=qcow2,id=hd \
    -netdev user,id=mynet,hostfwd=tcp::2222-:22 \
  -device virtio-net-device,netdev=mynet -serial stdio