-Boot on floppy (a), hard disk (c), CD-ROM (d), or network (n).
+Specify guest boot order. Use with 'order=', usage with no key or 'legacy=' is deprecated.
+
+`legacy`=`<[acdn]{1,4}>` ('default =' `cdn`);;
+
+Boot on floppy (a), hard disk (c), CD-ROM (d), or network (n). Deprecated, use 'order=' instead.
+
+`order`=`<device[;device...]>` ;;
+
+The guest will attempt to boot from devices in the order they appear here.
++
+Disks, optical drives and passed-through storage USB devices will be directly
+booted from, NICs will load PXE, and PCIe devices will either behave like disks
+(e.g. NVMe) or load an option ROM (e.g. RAID controller, hardware NIC).
++
+Note that only devices in this list will be marked as bootable and thus loaded
+by the guest firmware (BIOS/UEFI). If you require multiple disks for booting
+(e.g. software-raid), you need to specify all of them here.
++
+Overrides the deprecated 'legacy=[acdn]*' value when given.