Supermicro B13SEG Owner's Manual page 85

Chapter 4: UEFI BIOS
Pending Operation (Available when "Security Device Support" is set to Enable)
Use this feature to schedule a TPM-related operation to be performed by a security (TPM)
device at the next system boot to enhance system data integrity. Your system will reboot to
carry out a pending TPM operation. The options are None and TPM Clear.
Note: Your system will reboot to carry out a pending TPM operation.
Platform Hierarchy (Available when "Security Device Support" is set to Enable) (for
TPM Version 2.0 and above)
Select Enabled for TPM Platform Hierarchy support. This feature allows the manufacturer to
utilize the cryptographic algorithm to define a constant key or a fixed set of keys to be used for
initial system boot. These early boot codes are shipped with the platform and are included in
the list of "public keys." During system boot, the platform firmware uses the trusted public keys
to verify a digital signature in an attempt to manage and control the security of the platform
firmware used in a host system via a TPM device. The options are Disabled and Enabled.
Storage Hierarchy (Available when "Security Device Support" is set to Enable)
Select Enabled for TPM Storage Hierarchy support that is intended to be used for non-privacy-
sensitive operations by a platform owner such as an IT professional or the end user. Storage
Hierarchy has an owner policy and an authorization value, both of which can be set and are
held constant (rarely changed) through reboots. This hierarchy can be cleared or changed
independently of the other hierarchies. The options are Disabled and Enabled.
Endorsement Hierarchy (Available when "Security Device Support" is set to Enable)
Select Enabled for Endorsement Hierarchy support. This feature contains separate controls
to address your privacy concerns because the primary keys in the hierarchy are certified
by the TPM key or by a manufacturer with restrictions on how an authentic TPM device
that is attached to an authentic platform can be accessed and used. A primary key can be
encrypted and certified with a certificate created by using TPM2_ ActivateCredential, which
allows you to independently enable "flag, policy, and authorization values" without involving
other hierarchies. You can disable the endorsement hierarchy while still using the storage
hierarchy for TPM applications, permitting the platform software to use the TPM. The options
are Disabled and Enabled.
PH Randomization (for TPM Version 2.0 and above)
Select Enabled for Platform Hierarchy (PH) Randomization support. This feature is used only
during the platform developmental stage. This feature cannot be enabled in the production
platforms. The options are Disabled and Enabled.
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