iPXE undionly.kpxe Emulex 10GB random hang

[webminster]

Spent some time with debugging modes enabled on undionly.kpxe (and kkpxe as well). Unfortunately no debugging info is printed at all at the point where it hangs. It does print same debug info whether it works or hangs, it does print that it initialized the devices. But occasionally still hangs without info, and never un-hangs, at the control-b prompt.