iPXE USB stick - how to change timeout?

[NiKiZe]

See dhcp.h, however consider actually investigating the timouts instead.
All errors in iPXE have an error url, on that error url there are suggestions.

One common case when having timeouts is that you have STP enabled on the switch, but "fast-port" is disabled which means it can take quite a long time from link up before the switch starts forwarding packets for that port.