Dell PowerEdge MX840c EMC PowerEdge MX840c Installation and Service Manual - Page 36

Option, Description, Con s the Secure Boot Custom Policy. To enable this option

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Option Power Button AC Power Recovery UEFI Variable Access In-Band Manageability Interface Secure Boot Secure Boot Policy Secure Boot Mode Description 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. Enables or disables the power button on the front of the system. This option is set to Enabled by default. Sets how the system behaves after AC power is restored to the system. This option is set to Last by default. 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. When set to Disabled, this setting will hide 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. 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. When Secure Boot policy is set to Standard, the BIOS uses the system manufacturer's 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. Configures 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 Description In User Mode, PK must be installed, and BIOS performs signature verification on programmatic attempts to update policy objects. The BIOS allows unauthenticated programmatic transitions between modes. 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. Deployed Mode restricts the programmatic mode transitions. Audit Mode In Audit mode, PK is not present. The 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 and logs results in the image Execution Information Table, but executes the images whether they pass or fail verification. Secure Boot Policy Summary Secure Boot Custom Policy Settings Specifies the list of certificates and hashes that secure boot uses to authenticate images. Configures the Secure Boot Custom Policy. To enable this option, set the Secure Boot Policy to Custom option. 36 Pre-operating system management applications

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Option
Description
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 or disables 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.
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 will hide 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’s 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
Configures 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.
The BIOS allows unauthenticated programmatic transitions between modes.
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.
Deployed Mode
restricts the programmatic mode transitions.
Audit Mode
In
Audit mode
, PK is not present. The 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 and logs results in the
image Execution Information Table, but executes the images whether they pass or
fail verification.
Secure Boot
Policy Summary
Specifies the list of certificates and hashes that secure boot uses to authenticate images.
Secure Boot
Custom Policy
Settings
Configures the Secure Boot Custom Policy. To enable this option, set the Secure Boot Policy to
Custom
option.
36
Pre-operating system management applications