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36 CR12/CT12, VR12/VP12 UEFI Firmware User's Guide
Publication No. UGCR12V051E Rev. A.0
4.7.5
Limit CPUID Maximum
The optimal default is
Disabled
.
The CPUID instruction identifies the processor and its capabilities.
Before operating system can do so, it must first query the processor to find out the
highest input value CPUID recognizes. This determines the kind of basic information
CPUID can provide the operating system.
Older operating systems like Windows 95/98 and Windows Me were released before
the processor on this SBC and are therefore not aware of such a processor.
They are not capable of handling the extra CPUID information provided by the
processor with CPUID value greater than 03h.
When Limit CPUID Maximum feature is
Enabled
, the processor will limit the
maximum CPUID input value to 03h when queried, even if the processor supports a
higher CPUID input value.
When
Disabled
, the processor will return the actual maximum CPUID input value of
the processor when queried.
4.7.6
Intel Virtualization Technology
The optimal default is
Enabled
.
This feature is used to enable or disable the Intel Virtualization Technology (IVT)
extensions that allow multiple operating systems to run simultaneously on the same
system. It does this by creating virtual machines, each running its own x86 operating
system.
When
Enabled
, the IVT extensions will be enabled, allowing for hardware‐assisted
virtual machine management.
When
Disabled
, the IVT extensions will be disabled. However, software virtual
machine managers can still be used if virtualization is required.
4.7.7
EIST
NOTE
It is recommended to enable this feature. It should only be disabled for troubleshooting purposes.
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