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Table 6. Startup menu items
Menu item
Boot
Network Boot
UEFI/Legacy Boot
Boot Mode
104
User Guide
Selection
• Both
• UEFI Only
• Legacy Only
UEFI/Legacy Boot Priority
• UEFI First
• Legacy First
CSM Support (for UEFI Only)
• No
• Yes
• Quick
• Diagnostics
Comments
Refer to "Changing the startup
sequence" on page 102.
Refer to "Boot submenu" on page
103.
Select system boot capability.
• Both: The system will boot
following the UEFI/Legacy Boot
Priority setting.
• UEFI Only: The system will boot
from the UEFI enabled operating
system.
• Legacy Only: The system will boot
from any operating system other
than the UEFI enabled one.
Note: If you select UEFI Only,
the system cannot boot from the
bootable devices that do not have the
UEFI enabled operating system.
Compatibility Support Module (CSM)
is required for booting the legacy
operating system. If you select UEFI
Only, CSM Support is selectable.
For Both or Legacy Only mood, CSM
Support is not selectable.
Screen during the POST:
• Quick: The ThinkPad Logo screen
is displayed.
• Diagnostics: Test messages are
displayed.
Beep at POST completion:
• Quick: No. Sounds on error cases
only.
• Diagnostics: Yes. Always sounds.
"Ctrl-S" prompt for on-board
Ethernet:
• Quick: No.
• Diagnostics: Yes.
Memory testing during the POST:
• Quick: Quick test (or no test).
• Diagnostics: Full test.
Testing other devices during the
POST:
• Quick: Minimum test (or no test).
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