Intel DBS2400GP2 Datasheet download pdf (Page 61)

Intel

Server Board S2400GP TPS System Security

Revision 1.01

Intel order number G50295-002

 Produces EFI and legacy interfaces to a TPM-enabled operating system for using TPM.

 Produces ACPI TPM device and methods to allow a TPM-enabled operating system to

send TPM administrative command requests to the BIOS.

 Verifies operator physical presence. Confirms and executes operating system TPM

administrative command requests.

 Provides BIOS Setup options to change TPM security states and to clear TPM

ownership.

For additional details, refer to the TCG PC Client Specific Implementation Specification, the

TCG PC Client Specific Physical Presence Interface Specification, and the Microsoft BitLocker*

Requirement documents.

4.3.1 Physical Presence

Administrative operations to the TPM require TPM ownership or physical presence indication by

the operator to confirm the execution of administrative operations. The BIOS implements the

operator presence indication by verifying the setup Administrator password.

A TPM administrative sequence invoked from the operating system proceeds as follows:

1. User makes a TPM administrative request through the operating system’s security software.

2. The operating system requests the BIOS to execute the TPM administrative command

through TPM ACPI methods and then resets the system.

3. The BIOS verifies the physical presence and confirms the command with the operator.

4. The BIOS executes TPM administrative command(s), inhibits BIOS Setup entry and boots

directly to the operating system which requested the TPM command(s).

4.3.2 TPM Security Setup Options

The BIOS TPM Setup allows the operator to view the current TPM state and to carry out

rudimentary TPM administrative operations. Performing TPM administrative options through the

BIOS setup requires TPM physical presence verification.

Using BIOS TPM Setup, the operator can turn ON or OFF TPM functionality and clear the TPM

ownership contents. After the requested TPM BIOS Setup operation is carried out, the option

reverts to No Operation.

The BIOS TPM Setup also displays the current state of the TPM, whether TPM is enabled or

disabled and activated or deactivated. Note that while using TPM, a TPM-enabled operating

system or application may change the TPM state independent of the BIOS setup. When an

operating system modifies the TPM state, the BIOS Setup displays the updated TPM state.

The BIOS Setup TPM Clear option allows the operator to clear the TPM ownership key and

allows the operator to take control of the system with TPM. You use this option to clear security

settings for a newly initialized system or to clear a system for which the TPM ownership security

key was lost.

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Intel DBS2400GP2 Datasheet Page 61