Dell HHB Owner's Manual page 32

Option Description
TPM Information Changes the operational state of the TPM. This option is set to No Change by default.
TPM Status Specifies the TPM status.
TPM Command
Clears all the contents of the TPM. The TPM Clear option is set to No by default.
Intel TXT Enables or disables 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.
Power Button Enables or disables 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
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.
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 disabled by default.
Secure Boot When Secure Boot policy is set to Standard, the BIOS uses the system manufacturer's 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 Specifies the list of certificates and hashes that secure boot uses to authenticate images.
Policy Summary
Related tasks
Viewing System Security
Related reference
System Security
Secure Boot Custom Policy Settings
Secure Boot Custom Policy Settings is displayed only when Secure Boot Policy is set to Custom.
Viewing Secure Boot Custom Policy Settings
To view the Secure Boot Custom Policy Settings screen, perform the following steps:
Steps
1. Turn on, or restart your system.
2. Press F2 immediately after you see the following message:
F2 = System Setup
NOTE: If your operating system begins to load before you press F2, wait for the system to finish booting, and then
restart your system and try again.
3. On the System Setup Main Menu screen, click System BIOS.
4. On the System BIOS screen, click System Security.
5. On the System Security screen, click Secure Boot Custom Policy Settings.
Secure Boot Custom Policy Settings details
The Secure Boot Custom Policy Settings screen details are explained as follows:
Option Description
Platform Key Imports, exports, deletes, or restores the platform key (PK).
32 Pre-operating system management applications
CAUTION: Clearing the TPM results in the loss of all keys in the TPM. The loss of TPM keys may
affect booting to the operating system.