This lets you boot from ipxe. You can run the ipxe shell from their stock image or the netboot.xyz one. For the latter, press "m", then type "dhcp" (machine is now pingable!) then type "route" to check the ip. To boot type: chain http://192.168.42.1:4280/menu.ipxe and you're off! Thanks to frebib for finding the workaround to the VFS bug. The answer is you need to run the imgfree command to unblock the initrd.