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Table 7. Security menu items (continued)<br />
Menu item Submenu item Selection Comments<br />
UEFI BIOS Update Option<br />
Clear Security Chip • Enter Clear the encryption key.<br />
Intel TXT Feature • Disabled<br />
Flash BIOS Updating by<br />
End-<strong>User</strong>s<br />
• Enabled<br />
• Disabled<br />
• Enabled<br />
Flash Over LAN • Disabled<br />
• Enabled<br />
Memory Protection Execution Prevention • Disabled<br />
Virtualization<br />
194 <strong>User</strong> <strong>Guide</strong><br />
Intel Virtualization<br />
Technology<br />
• Enabled<br />
• Disabled<br />
• Enabled<br />
Intel VT-d Feature • Disabled<br />
• Enabled<br />
Note: Only if you select<br />
“Active” for Security Chip,<br />
this item appears.<br />
Enable or disable Intel<br />
Trusted Execution<br />
Technology.<br />
If you select “Enabled”,<br />
all users can update the<br />
UEFI BIOS. If you select<br />
“Disabled”, only the person<br />
who knows supervisor<br />
password can update the<br />
UEFI BIOS.<br />
Enable your computer's<br />
UEFI BIOS to be updated<br />
(flashed) over an active<br />
network connection.<br />
Some computer viruses<br />
and worms cause memory<br />
buffers to overflow by<br />
running code where only<br />
data is allowed. If the<br />
Data Execution Prevention<br />
feature can be used with<br />
your operating system, then<br />
by selecting “Enabled” you<br />
can protect your computer<br />
against attacks by such<br />
viruses and worms. If after<br />
choosing “Enabled” you<br />
find that an application<br />
program does not run<br />
correctly, select “Disabled”<br />
and reset the setting.<br />
If you select “Enabled,”<br />
a VMM (Virtual Machine<br />
Monitor) can utilize the<br />
additional hardware<br />
capabilities provided<br />
by Intel Virtualization<br />
Technology.<br />
Intel VT-d is Intel<br />
Virtualization Technology<br />
for Directed I/O. When<br />
enabled, a VMM can utilize<br />
the platform infrastructure<br />
for I/O virtualization.
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