were loaded from).  The code to identify this device isn't present yet,
but the code to act upon the knowledge is.

Call netdevice's poll() and transmit() methods only when device is open.

"boot" command to attempt booting from within the command shell, fall back
to shell if boot fails for any reason.

typical build will now include 880 bytes of PCI support code, compared to
2327 bytes in Etherboot 5.4.

(There is a slight cost of around 5 extra bytes per access to a
non-constant config space address; this should be an overall win.
Driver-specific accesses will usually be to constant addresses, for
which there is no additional cost.)

Yes, you really can do it in 65 bytes.