X1 Gen1 Carbons hang when trying to get a DHCP address through the embedded script

[nappington]

Another update.

I've downloaded the and I'm serving the default undionly.kpxe file from http://ipxe.org/howto/chainloading (that should technically result in an infinite loop if I don't set any dhcp server options).

The X1 loads into iPXE for the first time, but after it enumerates for the ASIX USB dongle again it halts without proceeding, as shown here: http://i.imgur.com/hdK61Ks.jpg

Am I correct in assuming that it hasn't even hit my custom iPXE build yet? I'm not familiar what's baked into undionly.kpxe (drivers?), but is there anything that can be changed with undionly.kpxe that might fix this?