Asus Z87-K - Manual (Page 66)

ASUS Z87-K 2-39
[Disabled] Disable the CSM to fully support the Windows ® Security Update and
Security Boot.
The following four items appear when you set Launch CSM to [Enabled].
Boot Devices Control [UEFI and Legacy OpROM]
Allows you to select the type of devices that you want to boot up. Configuration options:
[UEFI and Legacy OpROM] [Legacy OpROM only] [UEFI only]
Boot from Network Devices [Legacy OpROM first]
Allows you to select the type of network devices that you want to launch. Configuration
options: [Legacy OpROM first] [UEFI driver first] [Ignore]
Boot from Storage Devices [Legacy OpROM first]
Allows you to select the type of storage devices that you want to launch. Configuration
options: [Both, Legacy OpROM first] [Both, UEFI first] [Legacy OpROM first] [UEFI driver first]
[Ignore]
Boot from PCIe/PCI Expansion Devices [Legacy OpROM first]
Allows you to select the type of PCIe/PCI expansion devices that you want to launch.
Configuration options: [Legacy OpROM first] [UEFI driver first]
2.8.9 Secure Boot
Allows you to configure the Windows ® Secure Boot settings and manage its keys to protect
the system from unauthorized access and malwares during POST.
OS Type [Windows UE...]
Allows you to select your installed operating system.
[Windows UEFI mode]
Executes the Microsoft ® Secure Boot check. Only select this
option when booting on Windows ® UEFI mode or other Microsoft ®
Secure Boot compliant OS.
[Other OS] Get the optimized function when booting on Windows ® non-UEFI
mode, Windows ® Vista/XP, or other Microsoft ® Secure Boot
non-compliant OS. Only on Windows ® UEFI mode that Microsoft ®
Secure Boot can function properly.
The following item appears when OS Type is set to [Windows UEFI mode].
Key Management
This item appears only when you set Secure Boot Mode to [Custom]. It allows you to manage
the Secure Boot keys.
Clear Secure Boot keys
This item appears only when you load the default Secure Boot keys. This item allows
you to clear all default Secure Boot keys.
Save Secure Boot keys
This item appears only when you load the default Secure Boot keys. This item allows
you to save all default Secure Boot keys.