Reference Guide

Table 21. TPM 2.0 security information (continued)
Option Description
TPM Firmware Indicates the firmware version of the TPM.
TPM Hierarcy Enables, disables, or clears the storage and endorsement hierarchies. When set to Enabled, the storage
and endorsement hierarchies can be used.
When set to Disabled, the storage and endorsement hierarchies cannot be used.
When set to Clear, the storage and endorsement hierarchies are cleared of any values, and then reset
to Enabled.
TPM Advanced
Settings
Specifies TPM Advanced Settings details.
Table 22. System Security details
Option Description
Power Button Enables or disables the power button on the front of the system. This option is set to
Enabled by default.
AC Power Recovery Sets how the system behaves after AC power is restored to the system. This option is
set to Last by default.
AC Power Recovery Delay Sets the time delay for the system to power up after AC power is restored to the
system. This option is set to Immediate by default.
User Defined Delay (60 s to 600
s)
Sets the User Defined Delay option when the User Defined option for AC Power
Recovery Delay is selected.
UEFI Variable Access Provides varying degrees of securing UEFI variables. When set to Standard (the
default), UEFI variables are accessible in the operating system per the UEFI
specification. When set to Controlled, selected UEFI variables are protected in the
environment and new UEFI boot entries are forced to be at the end of the current boot
order.
Secure Boot Enables Secure Boot, where the BIOS authenticates each pre-boot image by using the
certificates in the Secure Boot Policy. Secure Boot is set to Disabled by default.
Secure Boot Policy When Secure Boot policy is set to Standard, the BIOS uses the system manufacturer’s
key and certificates to authenticate pre-boot images. When Secure Boot policy is set to
Custom, the BIOS uses the user-defined key and certificates. Secure Boot policy is set
to Standard by default.
Secure Boot Mode Configures how the BIOS uses the Secure Boot Policy Objects (PK, KEK, db, dbx).
If the current mode is set to Deployed Mode, the available options are User Mode and
Deployed Mode. If the current mode is set to User Mode, the available options are
User Mode, Audit Mode, and Deployed Mode.
Table 23. Secure Boot Mode
Options Descriptions
User Mode
In User Mode, PK must be installed, and BIOS performs signature
verification on programmatic attempts to update policy objects.
The BIOS allows unauthenticated programmatic transitions between
modes.
Deployed
Mode
Deployed Mode is the most secure mode. In Deployed Mode, PK
must be installed and the BIOS performs signature verification on
programmatic attempts to update policy objects.
Deployed Mode restricts the programmatic mode transitions.
Audit Mode
In Audit mode, PK is not present. The BIOS does not authenticate
programmatic updates to the policy objects, and transitions between
16 Pre-operating system management applications