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The BIOS Characteristic Extension Byte #2 is described in Table 1. Bit 3 of Byte 2
specifies UEFI specification support.
Table 1. BIOS Characteristics Extension Byte 2
Bit Position
Description
0
When set, BIOS boot specification is supported
1
When set, function key-initiated Network Service boot is supported. When
function key-initiated Network Service boot is not supported, a network
option ROM may choose to offer this functionality on its own, thus offering
this capability to legacy systems. When the function is supported, the
network adapter option ROM shall not offer this capability.
2
When set, enables Targeted Content Distribution. The manufacturer has
ensured that the SMBIOS data is useful in identifying the computer for
targeted delivery of model-specific software and firmware content through
third-party content distribution services.
3
When set, UEFI specification is supported.
4
When set, the SMBIOS table describes a virtual machine. When cleared, no
inference can be made about the virtuality of the system.
5:7
Reserved for future assignment by this specification.
The user can determine if the system has a UEFI BIOS by looking for the splash
screen during boot referencing a top-level Startup menu (Figure 3).
Figure 3. Splash screen of HP UEFI BIOS system
The startup menu (Figure 4) can be accessed by pressing the Esc key during the
boot sequence.
5
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