Manual

2-37ASUS Z77-A
The following four items appear only when you set Launch CSM to [Enabled].
Boot Device Control [UEFI and Legacy OpROM]
Conguration option: [UEFI and Legacy OpRom] [Legacy OpROM only] [UEFI only]
Boot from Network Devices [Legacy OpROM first]
Conguration option: [Legacy OpROM rst] [UEFI driver rst] [Ignore]
Boot from Storage Devices [Legacy OpRom first]
Conguration option: [Both, Legacy OpROM rst] [Both, UEFI rst] [Legacy OpROM
rst] [UEFI driver rst] [Ignore]
Boot from PCIe/PCI Expansion Devices [Legacy OpROM first]
Conguration option: [Legacy OpROM rst] [UEFI driver rst]