Adjust start-qemu to use scsi explicitly (and virtio-net)

start-qemu

@@ -47,7 +47,12 @@ if [ -n "${QEMU_HDA:-}" ]; then
 	fi
 	# http://wiki.qemu.org/download/qemu-doc.html#Invocation
 	#qemuArgs+=( -hda "$QEMU_HDA" )
-	qemuArgs+=( -drive file="$QEMU_HDA",index=0,media=disk,discard=unmap )
+	#qemuArgs+=( -drive file="$QEMU_HDA",index=0,media=disk,discard=unmap )
+	qemuArgs+=(
+		-drive file=arm32v7.qcow2,index=0,media=disk,discard=unmap,detect-zeroes=unmap,if=none,id=hda
+		-device virtio-scsi-device
+		-device scsi-hd,drive=hda
+	)
 fi
 
 if [ -n "${QEMU_CDROM:-}" ]; then
@@ -69,8 +74,8 @@ for port in "${qemuPorts[@]}"; do
 done
 
 qemuArgs+=(
-	-net nic
-	-net "$netArg"
+	-netdev "$netArg,id=net"
+	-device virtio-net-device,netdev=net
 	-vnc ':0'
 )
 if [ -z "${QEMU_NO_SERIAL:-}" ]; then