User`s guide

Chapter XVIII. Unified Boot
Chelsio T5/T4 Unified Wire For Linux Page 352
xiii. Allow the Chelsio option ROM to initialize and setup PXE devices.
DO NOT PRESS ALT-S to skip Chelsio option ROM.
xiv. In the system setup, choose any of the Chelsio PXE devices as the first boot device.
xv. Reboot. DO NOT PRESS ALT-S to skip Chelsio option ROM, during POST.
xvi. Hit [F12] key when prompted to start PXE boot.