So I’ve been trying to get iPXE chainloading to work and I’ve been using the iLO virtual serial console over SSH to verify and debug. iPXE has a DCHP debug build option which you can enable by doing make bin/undionly.kpxe DEBUG=dhcp. However, when you do this, you will find that each line of output on the iLO virtual serial console output overwrites the previous line, creating a big illegible mess. Fortunately, you can build iPXE with only serial output support, so that you can actually read the debug messages on the iLO virtual serial console.