Supermicro X13DDW-A User Manual page 125

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Fully Trusted: This option allows the CXL device to access CXL.$ for both host-attached and
device-attached memory ranges in the write-back (WB) address space.
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Partially Trusted: This option allows the CXL device to access CXL.$ for device-attached
memory ranges only.
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Untrusted: If this option is selected, the host (your system) will abort all requests on CXL.$.
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Auto: This option is based on Si Compatibility.
CXL Header Bypass
Set this feature to enable or disable the CXL header bypass. The options are Disable
and Enable.
South Bridge
The following information is displayed:
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USB Devices:
Legacy USB Support
Select Enabled to support onboard legacy USB devices. Select Auto to disable legacy
support if there are no legacy USB devices present. Select Disabled to have all USB
devices available for EFI applications only. The options are Enabled, Disabled, and Auto.
XHCI Hand-off
This is a work-around solution for operating systems that do not support Extensible Host
Controller Interface (XHCI) hand-off. The XHCI ownership change should be claimed by
the XHCI driver. The options are Enabled, Disabled, and Auto.
Port 60/64 Emulation
Select Enabled for I/O port 60h/64h emulation support, which in turn, provides complete
legacy USB keyboard support for the operating systems that do not support legacy USB
devices. The options are Disabled and Enabled.
PCIe PLL SSC
Select Enabled for PCH PCIe Spread Spectrum Clocking (SSC) support, which allows the
BIOS to monitor and attempt to reduce the level of electromagnetic interference caused by
the components whenever needed. The options are Disabled and Enabled.
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Chapter 4: UEFI BIOS