Dell EMC E39S Series Installation And Service Manual page 65

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 This setting is enabled only when TPM Security is set to ON.
Settings
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 Sets how the system behaves after AC power is restored to the system. This option is set to Last by default.
Recovery
AC Power Enables you to set the time that the system should take to turn on after AC power is restored to the system. This
Recovery Delay option is set to Immediate by default.
User Defined Enables you to set the User Defined Delay option when the User Defined option for AC Power Recovery
Delay (60 s to 600 Delay is selected.
s)
UEFI Variable Provides varying degrees of securing UEFI variables. When set to Standard (the default), UEFI variables are
Access 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 When set to Disabled, this setting hides the Management Engine's (ME), HECI devices, and the system's IPMI
Manageability devices from the operating system. This prevents the operating system from changing the ME power capping
Interface 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.
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 When Secure Boot policy is set to Standard, the BIOS uses the system manufacturer key and certificates to
Policy 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
User Mode
Audit Mode
Deployed Mode
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.
Description
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.
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 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 65