Option
Description
This field is read-only when
TPM Security
is set to
Off
. The action requires an additional reboot before it can
take effect.
TPM Advanced
Settings
This setting is enabled only when TPM Security is set to ON.
Intel(R) TXT
Enables you to set the Intel Trusted Execution Technology (TXT) option. To enable the
Intel TXT
option,
virtualization technology and TPM Security must be enabled with Pre-boot measurements. This option is set to
Off
by default.
When TPM 2.0 is installed,
TPM 2 Algorithm
option is available. It enables you to select a hash algorithm from
those supported by the TPM (SHA1, SHA256).
TPM 2 Algorithm
option must be set to
SHA256
, to enable TXT.
Power Button
Enables you to set 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
Enables you to set the time that the system should take to turn on after AC power is restored to the system. This
option is set to
Immediate
by default.
User Defined
Delay (60 s to 600
s)
Enables you to set 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.
In-Band
Manageability
Interface
When set to
Disabled
, this setting hides the Management Engine's (ME), HECI devices, and the system's IPMI
devices from the operating system. This prevents the operating system from changing the ME power capping
settings, and blocks access to all in-band management tools. All management should be managed through out-of-
band. This option is set to
Enabled
by default.
NOTE:
BIOS update requires HECI devices to be operational and DUP updates require IPMI
interface to be operational. This setting needs to be set to Enabled to avoid updating errors.
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 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
Enables you to configure 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
.
Options
Description
User Mode
In
User Mode
, PK must be installed, and BIOS performs signature verification on
programmatic attempts to update policy objects.
BIOS allows unauthenticated programmatic transitions between modes.
Audit Mode
In
Audit mode
, PK is not present. BIOS does not authenticate programmatic updates to
the policy objects, and transitions between modes.
Audit Mode
is useful for programmatically determining a working set of policy objects.
BIOS performs signature verification on pre-boot images. BIOS also logs the results in the
image Execution Information Table, but approves the images whether they pass or fail
verification.
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.
Pre-operating system management applications
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