Dell E67S User manual

Dell EMC PowerEdge R6525
BIOS and UEFI Reference Guide
Part Number: E67S
Regulatory Type: E67S001
August 2022
Rev. A08

Notes, cautions, and warnings
NOTE: A NOTE indicates important information that helps you make better use of your product.
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid
the problem.
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
© 2019 - 2022 Dell Inc. or its subsidiaries. All rights reserved. Dell, EMC, and other trademarks are trademarks of Dell Inc. or its subsidiaries.
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Chapter 1: Pre-operating system management applications...........................................................4
System Setup....................................................................................................................................................................... 4
System BIOS................................................................................................................................................................... 5
iDRAC Settings utility..................................................................................................................................................21
Device Settings............................................................................................................................................................ 22
Dell Lifecycle Controller................................................................................................................................................... 22
Embedded system management..............................................................................................................................22
Boot Manager.....................................................................................................................................................................22
PXE boot............................................................................................................................................................................. 22
Contents
Contents 3

Pre-operating system management
applications
You can manage basic settings and features of a system without booting to the operating system by using the system firmware.
Options to manage the pre-operating system applications
You can use any one of the following options to manage the pre-operating system applications:
●System Setup
●Dell Lifecycle Controller
●Boot Manager
●Preboot Execution Environment (PXE)
Topics:
•System Setup
•Dell Lifecycle Controller
•Boot Manager
•PXE boot
System Setup
Using the System Setup option, you can configure the BIOS settings, iDRAC settings, and device settings of the system.
You can access system setup by using any one of the following interfaces:
●Graphical User interface — To access go to iDRAC Dashboard, click Configuration, and click BIOS Settings.
●Text browser — The browser is enabled by using Console Redirection.
To view System Setup, power on the system, press F2, and click System Setup Main Menu.
NOTE: If the operating system begins to load before you press F2, wait for the system to finish booting, and then restart
the system and try again.
The System Setup Main Menu screen details are described as follows:
Table 1. System Setup Main Menu
Option Description
System BIOS Enables you to configure the BIOS settings.
iDRAC Settings Enables you to configure the iDRAC settings. The iDRAC
settings utility is an interface to set up and configure
the iDRAC parameters by using UEFI (Unified Extensible
Firmware Interface). You can enable or disable various
iDRAC parameters by using the iDRAC settings utility. For
more information about this utility, see Integrated Dell
Remote Access Controller User’s Guide at www.dell.com/
poweredgemanuals.
Device Settings Enabled you to configure device settings for devices such as
storage controllers or network cards.
1
4 Pre-operating system management applications

System BIOS
To view the System BIOS screen, power on the system, press F2, and click System Setup Main Menu > System BIOS.
Table 2. System BIOS details
Option Description
System Information Provides information about the system such as the system model name, BIOS
version, and Service Tag.
Memory Settings Specifies information and options related to the installed memory.
Processor Settings Specifies information and options related to the processor such as speed and
cache size.
SATA Settings Specifies options to enable or disable the integrated SATA controller and ports.
NVMe Settings Specifies options to change the NVMe settings. If the system contains the
NVMe drives that you want to configure in a RAID array, you must set both
this field and the Embedded SATA field on the SATA Settings menu to
RAID mode. You might also need to change the Boot Mode setting to UEFI.
Otherwise, you should set this field to Non-RAID mode.
Boot Settings Specifies options to specify the Boot mode (BIOS or UEFI). Enables you to
modify UEFI and BIOS boot settings.
Network Settings Specifies options to manage the UEFI network settings and boot protocols.
Legacy network settings are managed
from the Device Settings menu.
NOTE: Network Settings are not supported in BIOS boot mode.
Integrated Devices Specifies options to manage integrated device controllers and ports, specifies
related features, and options.
Serial Communication Specifies options to manage the serial ports, its related features, and options.
System Profile Settings Specifies options to change the processor power management settings, memory
frequency.
System Security Specifies options to configure the system security settings, such as system
password, setup password, Trusted Platform Module (TPM) security, and UEFI
secure boot. It also manages the power button on the system
Redundant OS Control Sets the redundant OS information for redundant OS control.
Miscellaneous Settings Specifies options to change the system date and time.
System Information
To view the System Information screen, power on the system, press F2, and click System Setup Main Menu > System
BIOS > System Information.
Table 3. System Information details
Option Description
System Model Name Specifies the system model name.
System BIOS Version Specifies the BIOS version installed on the system.
System Service Tag Specifies the system Service Tag.
System Manufacturer Specifies the name of the system manufacturer.
System Manufacturer Contact Information Specifies the contact information of the system manufacturer.
Pre-operating system management applications 5

Table 3. System Information details (continued)
Option Description
System CPLD Version Specifies the current version of the system complex programmable
logic device (CPLD) firmware.
UEFI Compliance Version Specifies the UEFI compliance level of the system firmware.
AGESA Version Specifies the AGESA reference code version.
SMU Version Specifies the SMU firmware version.
DXIO Version Specifies the DXIO firmware version.
Memory Settings
To view the Memory Settings screen, power on the system, press F2, and click System Setup Main Menu > System BIOS
> Memory Settings.
Table 4. Memory Settings details
Option Description
System Memory Size Specifies the memory size in the system.
System Memory Type Specifies the type of memory installed in the system.
System Memory Speed Specifies the system memory speed.
System Memory Voltage Specifies the system memory voltage.
Video Memory Specifies the amount of video memory.
System Memory Testing Specifies whether the system memory tests are run during system boot.
The two options available are Enabled and Disabled. This option is set to
Disabled by default.
DRAM Refresh Delay By enabling the CPU memory controller to delay running the REFRESH
commands, you can improve the performance for some workloads. By
minimizing the delay time, it is ensured that the memory controller runs
the REFRESH command at regular intervals. For Intel-based servers, this
setting only affects systems configured with DIMMs which use 8 Gb
density DRAMs. This option is set to Minimum by default.
Memory Operating Mode Specifies the memory operating mode. The option is available and is set to
Optimizer Mode, by default.
Current State of Memory Operating Mode Specifies the current state of the memory operating mode.
Memory Interleaving Enables or disables the memory interleaving option. The two options
available are Auto and Disabled. This option is set to Auto by default.
Correctable Error Logging Enables or disables correctable error logging. This option is set to
Enabled by default.
DIMM Self healing (Post Package Repair) on
Uncorrectable Memory Error
Enables or disables Post Package Repair (PPR) on Uncorrectable Memory
Error. This option is set to Enabled by default.
Processor Settings
To view the Processor Settings screen, power on the system, press F2, and click System Setup Main Menu > System
BIOS > Processor Settings.
6Pre-operating system management applications

Table 5. Processor Settings details
Option Description
Logical Processor Each processor core supports up to two logical processors.
If this option is set to Enabled, the BIOS displays all the
logical processors. If this option is set to Disabled, the BIOS
displays only one logical processor per core. This option is set
to Enabled by default.
Virtualization Technology Enables or disables the virtualization technology for the
processor. This option is set to Enabled by default.
IOMMU Support Enable or Disable IOMMU support. It is required to create
IVRS ACPI table. This option is set to Enabled by default.
Kernel DMA Protection When this option is set to Enabled, using IOMMU, BIOS,
and the Operating System will enable direct memory access
protection for DMA capable peripheral devices. Enable
IOMMU Support to use this option. This option is set
to Disabled by default. When set to Enabled by using
Virtualization Technology, BIOS and Operating System will
enable direct memory access protection for DMA capable
peripheral devices. Enable Virtualization Technology to use
this option.
L1 Stream HW Prefetcher Enables or disables the L1 stream hardware prefetcher. This
option is set to Enabled by default.
L2 Stream HW Prefetcher Enables or disables the L2 stream hardware prefetcher. This
option is set to Enabled by default.
L1 Stride Prefetcher Enables or disables the L1 stride prefetcher. This option is set
to Enabled by default, as it optimizes overall workload.
L1 Region Prefetcher Enables or disables the L1 region prefetcher. This option is set
to Enabled by default, as it optimizes overall workload.
L2 Up Down Prefetcher Enables or disables the L2 up down prefetcher. This option is
set to Enabled by default, as it optimizes overall workload.
MADT Core Enumeration Specifies the MADT Core Enumeration. This option is set to
Linear by default.
NUMA Nodes Per Socket Specifies the number of NUMA nodes per socket. This option
is set to 1by default.
CCX as NUMA Domain Enables or disables the CCX as NUMA Domain. This option is
set to Disabled by default.
Secure Memory Encryption (SME) Enables or disables the AMD secure encryption features such
as SME and Secure Encrypted Virtualization (SEV). It also
determines if other secure encryption features such as TSME
and SEV-SNP can be enabled. This option is set to Disabled
by default.
Minimum SEV non-ES ASID Determines the number of Secure Encrypted Virtualization ES
and non-ES available Address Space IDs. This option is set to
1by default.
Secured Nested Paging (SNP) Enables or disables SEV-SNP, a set of additional security
protections. This option is set to Disabled by default.
SNP Memory Coverage This option selects the operating mode of the Nested Paging
(SNP) Memory and the reverse Map Table(RMP). The RMP
is used to ensure a one-to-one mapping between system
physical addresses and guest physical addresses.
Transparent Secure Memory Encryption (TSME) Enables or disables the TSME. TSME is always-on memory
encryption that does not require OS or hypervisor support.
This option is set to Disabled by default.
Pre-operating system management applications 7

Table 5. Processor Settings details (continued)
Option Description
●If the OS supports SME, do not enable this field.
●If the hypervisor supports SEV, do not enable this field.
Enabling
TSME affects the system memory performance.
Enhanced REP MOVSB/STOSB Enables or disables Enhanced REP MOVSB/STOSB support.
This setting can affect performance, depending on the
application running on the server. This option is set to
Disabled by default.
NOTE: This option is only available for the AMD EPYC
7003 processor.
Fast Short REP MOVSB Enables or disables Fast Short REP MOVSB support. This
setting can affect performance, depending on the application
running on the server. This option is set to Disabled by
default.
NOTE: This option is only available for the AMD EPYC
7003 processor.
REP-MOV/STOS Streaming Enables or disables REP MOVISTOS Streaming support. This
setting can affect performance, depending on the application
running on the server. This option is set to Disabled by
default.
NOTE: This option is only available for the AMD EPYC
7003 processor.
Configurable TDP Allows the reconfiguration of the processor Thermal Design
Power (TDP) levels based on the power and thermal delivery
capabilities of the system. TDP refers to the maximum amount
of power the cooling system is required to dissipate. This
option is set to Maximum by default.
NOTE: This option is only available on certain SKUs of the
processors, and the number of alternative levels varies as
well.
x2APIC Mode Enables or disables x2APIC mode. This option is set to
Enabled by default.
NOTE: For two CPU 64 cores configuration, x2APIC
mode is not switchable if 256 threads are enabled (BIOS
settings: All CCD, cores, and logical processors enabled).
Number of CCDs per Processor Controls the number of enabled CCDs in each processor. This
option is set to All by default.
Number of Cores per CCD Specifies the number of cores per CCD. This option is set to
All by default.
Processor Core Speed Specifies the maximum core frequency of the processor.
Processor n NOTE: Depending on the number of CPUs, there might be
up to n processors listed.
The following settings are displayed for each processor that is
installed in the
system:
8 Pre-operating system management applications

Table 6. Processor n details
Option Description
Family-Model-Stepping Specifies the family, model, and stepping of the processor as
defined by AMD.
Brand Specifies the brand name.
Level 2 Cache Specifies the total L2 cache.
Level 3 Cache Specifies the total L3 cache.
Number of Cores Specifies the number of cores per processor.
Microcode Specifies the processor microcode version.
SATA Settings
To view the SATA Settings screen, power on the system, press F2, and click System Setup Main Menu > System BIOS >
SATA Settings.
Table 7. SATA Settings details
Option Description
Embedded SATA Enables the embedded SATA option to be set to Off, AHCI mode , or RAID modes.
This option is set to AHCI Mode by default.
NOTE:
1. You might also need to change the Boot Mode setting to UEFI. Otherwise, you
should set the field to Non-RAID mode.
2. No ESXi and Ubuntu OS support under RAID mode.
Security Freeze Lock Sends Security Freeze Lock command to the embedded SATA drives during POST.
This option is applicable only for AHCI Mode. This option is set to Enabled by default.
Write Cache Enables or disables the command for the embedded SATA drives during POST. This
option is set to Disabled by default.
Port n Sets the drive type of the selected device.
For AHCI Mode or RAID Mode, BIOS support is always enabled.
Table 8. Port n
Options Descriptions
Model Specifies the drive model of the selected
device.
Drive Type Specifies the type of drive attached to
the SATA port.
Capacity Specifies the total capacity of the drive.
This field is undefined for removable
media devices such as optical drives.
NVMe Settings
To view the NVMe Settings screen, power on the system, press F2, and click System Setup Main Menu > System BIOS >
NVMe Settings
Pre-operating system management applications 9

Table 9. NVMe Settings details
Option Description
NVMe Mode This option sets the NVMe drive mode. If the system contains NVMe drives that you
want to configure in a RAID array, you must set both this field and the Embedded
SATA field on the SATA settings menu to RAID Mode. You may also need to change
the Boot Mode setting to UEFI. The option is set to Non-RAID mode by default.
BIOS NVMe Driver Dell Qualified NVMe drives always use the UEFINVMe driver built into the Dell EROS.
When this option is set to 'All Drives', the BIOS driver will also be used with any NVMe
drives in the system that has not been qualified by Dell. The option is set to Dell
Qualified Drives by default.
NOTE: When this option is set to 'All Drives' and non-Dell qualified NVMe drives
are present, you have a configuration that has not been validated which may lead
to unexpected behavior.
Boot Settings
You can use the Boot Settings screen to set the boot mode to either BIOS or UEFI. It also enables you to specify the boot
order.
●UEFI: The Unified Extensible Firmware Interface (UEFI) is a new interface between operating systems and platform
firmware. The interface consists of data tables with platform related information, boot and runtime service calls that are
available to the operating system and its loader. The following benefits are available when the Boot Mode is set to UEFI:
○Support for drive partitions larger than 2 TB.
○Enhanced security (e.g., UEFI Secure Boot).
○Faster boot time.
NOTE: You must use only the UEFI boot mode in order to boot from NVMe drives.
●BIOS: The BIOS Boot Mode is the legacy boot mode. It is maintained for backward compatibility.
To view the Boot Settings screen, power on the system, press F2, and click System Setup Main Menu > System BIOS >
Boot Settings.
Table 10. Boot Settings details
Option Description
Boot Mode Enables you to set the boot mode of the system. If the operating system supports
UEFI, you can set this option to UEFI. Setting this field to BIOS allows compatibility
with non-UEFI operating systems. This option is set to UEFI by default.
CAUTION: Switching the boot mode may prevent the system from
booting if the operating system is not installed in the same boot mode.
NOTE: Setting this field to UEFI disables the BIOS Boot Settings menu.
Boot Sequence Retry Enables or disables the Boot Sequence Retry feature. If this option is set to
Enabled and the system fails to boot, the system re-attempts the boot sequence
after 30 seconds. This option is set to Enabled by default.
Hard-disk Failover Enables or disables the Hard-disk failover. This option is set to Disabled by default.
Generic USB Boot Enables or disables the generic USB boot placeholder. This option is set to
Disabled by default.
Hard-disk Drive Placeholder Enables or disables the Hard-disk drive placeholder. This option is set to Disabled
by default.
Clean all Sysprep order and variables When set to None, BIOS will do nothing. When set to Yes, BIOS will delete
variables of SysPrep #### and SysPrepOrder this option is a onetime option, will
reset to none when deleting variables. This setting is only available in UEFI Boot
Mode. This option is set to None by default.
UEFI Boot Settings Specifies the UEFI boot sequence. Enables or disables UEFI Boot options.
10 Pre-operating system management applications

Table 10. Boot Settings details (continued)
Option Description
NOTE: This option controls the UEFI boot order. The first option in the list will
be attempted first.
Table 11. UEFI Boot Settings
Option Description
UEFI Boot Sequence Enables you to change the boot device
order.
Boot Options Enable/Disable Enables you to select the enabled or
disabled boot devices
Choosing system boot mode
System Setup enables you to specify one of the following boot modes for installing your operating system:
●UEFI boot mode (the default), is an enhanced 64-bit boot interface.
If you have configured your system to boot to UEFI mode, it replaces the system BIOS.
1. From the System Setup Main Menu, click Boot Settings, and select Boot Mode.
2. Select the UEFI boot mode you want the system to boot into.
CAUTION: Switching the boot mode may prevent the system from booting if the operating system is not
installed in the same boot mode.
3. After the system boots in the specified boot mode, proceed to install your operating system from that mode.
NOTE: Operating systems must be UEFI-compatible to be installed from the UEFI boot mode. DOS and 32-bit operating
systems do not support UEFI and can only be installed from the BIOS boot mode.
NOTE: For the latest information about supported operating systems, go to www.dell.com/ossupport.
Changing boot order
About this task
You may have to change the boot order if you want to boot from a USB key or an optical drive. The following instructions may
vary if you have selected BIOS for Boot Mode.
NOTE: Changing the drive boot sequence is only supported in BIOS boot mode.
Steps
1. On the System Setup Main Menu screen, click System BIOS > Boot Settings > UEFI Boot Settings > UEFI Boot
Sequence.
2. Use the arrow keys to select a boot device, and use the plus (+) and minus (-) sign keys to move the device down or up in
the order.
3. Click Exit, and then click Yes to save the settings on exit.
NOTE: You can also enable or disable boot order devices as needed.
Network Settings
To view the Network Settings screen, power on the system, press F2, and click System Setup Main Menu > System BIOS
> Network Settings.
NOTE: For information about Linux network performance settings, see the Linux Network Tuning Guide for AMD EPYC
Processor Based Servers at AMD.com.
Pre-operating system management applications 11

NOTE: Network Settings are not supported in BIOS boot mode.
Table 12. Network Settings details
Option Description
UEFI PXE Settings Enables you to control the configuration of the UEFI PXE device.
PXE Device n (n = 1 to 4) Enables or disables the device. When enabled, a UEFI PXE boot option is
created for the device.
PXE Device n Settings(n = 1 to 4) Enables you to control the configuration of the PXE device.
UEFI HTTP Settings Enables you to control the configuration of the UEFI HTTP device.
HTTP Device n (n = 1 to 4) Enables or disables the device. When enabled, a UEFI HTTP boot option is
created for the device.
HTTP Device n Settings (n = 1 to 4) Enables you to control the configuration of the HTTP device.
UEFI iSCSI Settings Enables you to control the configuration of the iSCSI device.
Table 13. PXE Device n Settings details
Option Description
Interface Specifies NIC interface used for the PXE device.
Protocol Specifies Protocol used for PXE device. This option is set to IPv4 or IPv6. This option is set to
IPv4 by default.
Vlan Enables Vlan for PXE device. This option is set to Enable or Disable. This option is set to
Disable by default.
Vlan ID Shows the Vlan ID for the PXE device
Vlan Priority Shows the Vlan Priority for the PXE device.
Table 14. HTTP Device n Settings details
Option Description
Interface Specifies NIC interface used for the HTTP device.
Protocol Specifies Protocol used for HTTP device. This option is set to IPv4 or IPv6. This option is set
to IPv4 by default.
The following options will be available when Protocol is set as IPv6:
Auto Configuration: IPv6 Auto Configuration Enable/Disabled for this HTTP Device.
IPv6 Address: IPv6 Unicast address for this HTTP Device.
Prefix Length: IPv6 Prefix Length (0-128) for this HTTP Device.
Vlan Enables Vlan for HTTP device. This option is set to Enable or Disable. This option is set to
Disable by default.
Vlan ID Shows the Vlan ID for the HTTP device
Vlan Priority Shows the Vlan Priority for the HTTP device.
DHCP Enables or disables DHCP for this HTTP device. This option is set to Enable by default.
IP Address Specifies IP address for the HTTP device.
Subnet Mask Specifies subnet mask for the HTTP device.
Gateway Specifies gateway for the HTTP device.
DNS info via DHCP Enables or disables DNS Information from DHCP. This option is set to Enable by default.
Primary DNS Specifies the primary DNS server IP address for the HTTP Device.
12 Pre-operating system management applications

Table 14. HTTP Device n Settings details (continued)
Option Description
Secondary DNS Specifies the secondary DNS server IP address for the HTTP Device.
URI Obtain URI from the DHCP server if not specified
Table 15. UEFI iSCSI Settings screen details
Option Description
iSCSI Initiator Name Specifies the name of the iSCSI initiator in IQN format.
iSCSI Device1 Enables or disables the iSCSI device. When disabled, a UEFI boot option is created for
the iSCSI device automatically. This is set to Disabled by default.
iSCSI Device1 Settings Enables you to control the configuration of the iSCSI device.
Table 16. ISCSI Device1 Settings screen details
Option Description
Connection 1 Enables or disables the iSCSI connection. This option is set to Disable by default.
Connection 2 Enables or disables the iSCSI connection. This option is set to Disable by default.
Connection 1 Settings Enables you to control the configuration for the iSCSI connection.
Connection 2 Settings Enables you to control the configuration for the iSCSI connection.
Connection Order Enables you to control the order for which the iSCSI connections will be
attempted.
Integrated Devices
To view the Integrated Devices screen, power on the system, press F2, and click System Setup Main Menu > System BIOS
> Integrated Devices.
Table 17. Integrated Devices details
Option Description
User Accessible USB Ports Configures the user accessible USB ports. Selecting Only Back Ports On
disables the front USB ports; selecting All Ports Off disables all front and
back USB ports; selecting All Ports Off (Dynamic) disables all front and back
USB ports during POST. This option is set to All Ports On by default.
When user accessible USB ports is set to All Ports Off (Dynamic) the
Enable Front Ports Only option is enabled.
●Enable Front Ports Only: Enables or disables the front USB ports during
the OS runtime.
The USB keyboard and mouse still function in certain USB ports during the
boot process, depending on the selection. After the boot process is complete,
the USB ports will be enabled or disabled as per the setting.
Internal USB Port Enables or disables the Internal USB Port. This option is set to On or Off.
This option is set to On by default.
iDRAC Direct USB Port The iDRAC Direct USB port is managed by iDRAC exclusively with no host
visibility. This option is set to ON or OFF. When set to OFF, iDRAC does not
detect any USB devices installed in this managed port. This option is set to On
by default.
Integrated RAID Controller Enables or disables the integrated RAID controller. This option is set to
Enabled by default.
Embedded NIC1 and NIC2 Enables or disables the Embedded NIC1 and NIC2 options. If set to Disabled
(OS), the NIC may still be available for shared network access by the
Pre-operating system management applications 13

Table 17. Integrated Devices details (continued)
Option Description
embedded management controller. Configure the Embedded NIC1 and NIC2
option by using the NIC management utilities of the system.
Embedded Video Controller Enables or disables the use of Embedded Video Controller as the primary
display. When set to Enabled, the Embedded Video Controller will be the
primary display even if add-in graphic cards are installed. When set to
Disabled, an add-in graphics card will be used as the primary display. BIOS
will output displays to both the primary add-in video and the embedded video
during POST and pre-boot environment. The embedded video will then be
disabled right before the operating system boots. This option is set to Enabled
by default.
NOTE: When there are multiple add-in graphic cards installed in the
system, the first card discovered during PCI enumeration is selected as
the primary video. You might have to re-arrange the cards in the slots in
order to control which card is the primary video.
Current State of Embedded Video
Controller
Displays the current state of the embedded video controller. The Current
State of Embedded Video Controller option is a read-only field. If the
Embedded Video Controller is the only display capability in the system (that
is, no add-in graphics card is installed), then the Embedded Video Controller
is automatically used as the primary display even if the Embedded Video
Controller setting is set to Disabled.
Root Complex 0x00 LCLK Frequency Sets the LCLK frequency for Bus address 0x00.
Root Complex 0x20 LCLK Frequency Sets the LCLK frequency for Bus address 0x20.
Root Complex 0x40 LCLK Frequency Sets the LCLK frequency for Bus address 0x40.
Root Complex 0x60 LCLK Frequency Sets the LCLK frequency for Bus address 0x60.
Root Complex 0x80 LCLK Frequency Sets the LCLK frequency for Bus address 0x80.
Root Complex 0xA0 LCLK Frequency Sets the LCLK frequency for Bus address 0xA0.
Root Complex 0xC0 LCLK Frequency Sets the LCLK frequency for Bus address 0xC0.
Root Complex 0xE0 LCLK Frequency Sets the LCLK frequency for Bus address 0xE0.
PCIe Preferred IO Bus When set to Enabled, you can provide the Bus address (in decimal) to choose
end device for preferred IO Bus. This option is set to Disabled by default.
Enhanced Preferred IO When set to Enabled, the LCLK speed for the root complex where Preferred
IO is enabled will automatically be set to 600 MHz (effective 593 MHz).
SR-IOV Global Enable Enables or disables the BIOS configuration of Single Root I/O Virtualization
(SR-IOV) devices. This option is set to Disabled by default.
Internal SD Card Port Enables or disables the internal SD card port of the Internal Dual SD Module
(IDSDM). This option is set to On by default.
Internal SD Card Redundancy Configures the redundancy mode of the Internal Dual SD Module (IDSDM).
When set to Mirror Mode, data is written on both SD cards. After failure of
either card and replacement of the failed card, the data of the active card is
copied to the offline card during the system boot.
When Internal SD Card Redundancy is set to Disabled, only the primary SD
card is visible to the OS. This option is set to Mirror by default.
Internal SD Primary Card By default, the primary SD card is selected to be SD Card 1. If SD Card 1 is not
present, then the controller selects SD Card 2 to be the primary SD card. This
option is set to SD Card 1 by default.
OS Watchdog Timer If your system stops responding, this watchdog timer aids in the recovery
of your operating system. When this option is set to Enabled, the operating
14 Pre-operating system management applications

Table 17. Integrated Devices details (continued)
Option Description
system initializes the timer. When this option is set to Disabled (the default),
the timer does not have any effect on the system.
Memory Mapped I/O Limit Controls where MMIO is mapped. The 1 TB option is designed for specific
OS which cannot support MMIO over 1 TB. This option is set to 8 TB by
default. The default option is the maximum address that the system supports
and recommended in most cases.
Slot Disablement Enables or disables the available PCIe slots on your system. The slot
disablement feature controls the configuration of the PCIe cards installed in
the specified slot. Slots must be disabled only when the installed peripheral
card prevents booting into the operating system or causes delays in system
startup. If the slot is disabled, both the Option ROM and UEFI drivers are
disabled. Only slots that are present on the system will be available for control.
Slot n: Enables or disables or only the boot driver is disabled for the PCIe slot
n. This option is set to Enabled by default.
Slot Bifurcation Slot Discovery Bifurcation Settings allows Platform Default Bifurcation
and Manual bifurcation Control.
The default is set to Platform Default Bifurcation. The slot bifurcation field
is accessible when set to Manual bifurcation Control and is grayed out when
set to Platform Default Bifurcation.
Serial Communication
To view the Serial Communication screen, power on the system, press F2, and click System Setup Main Menu > System
BIOS > Serial Communication.
NOTE: The serial port is optional for the PowerEdge R6525 system. The Serial Communication option is applicable only if
the serial COM port is installed in the system.
Table 18. Serial Communication details
Option Description
Serial Communication Selects serial communication devices (Serial Device 1 and Serial Device 2) in
BIOS. BIOS console redirection can also be enabled, and the port address can
be specified. This option is set to Auto by default.
Serial Port Address Enables you to set the port address for serial devices. This option is set to
Serial Device1=COM2, Serial Device 2=COM1 by default.
NOTE: You can use only Serial Device 2 for the Serial Over LAN (SOL)
feature. To use console redirection by SOL, configure the same port
address for console redirection and the serial device.
NOTE: Every time the system boots, the BIOS syncs the serial MUX
setting that is saved in iDRAC. The serial MUX setting can independently
be changed in iDRAC. Loading the BIOS default settings from within the
BIOS setup utility may not always revert the serial MUX setting to the
default setting of Serial Device 1.
External Serial Connector Enables you to associate the External Serial Connector to Serial Device 1,
Serial Device 2, or the Remote Access Device by using this option. This
option is set to Serial Device 1 by default.
NOTE: Only Serial Device 2 can be used for Serial Over LAN (SOL).
To use console redirection by SOL, configure the same port address for
console redirection and the serial device.
NOTE: Every time the system boots, the BIOS syncs the serial MUX
setting saved in iDRAC. The serial MUX setting can independently be
Pre-operating system management applications 15

Table 18. Serial Communication details (continued)
Option Description
changed in iDRAC. Loading the BIOS default settings from within the BIOS
setup utility may not always revert this setting to the default setting of
Serial Device 1.
Failsafe Baud Rate Specifies the failsafe baud rate for console redirection. The BIOS attempts to
determine the baud rate automatically. This failsafe baud rate is used only if
the attempt fails, and the value must not be changed. This option is set to
115200 by default.
Remote Terminal Type Sets the remote console terminal type. This option is set to VT100/VT220 by
default.
Redirection After Boot Enables or disables the BIOS console redirection when the operating system is
loaded. This option is set to Enabled by default.
System Profile Settings
To view the System Profile Settings screen, power on the system, press F2, and click System Setup Main Menu > System
BIOS > System Profile Settings.
Table 19. System Profile Settings details
Option Description
System Profile Sets the system profile. If you set the System Profile option to a mode other than Custom,
the BIOS automatically sets the rest of the options. You can only change the rest of the
options if the mode is set to Custom. This option is set to Performance Per Watt (OS) by
default. Other options include Performance and Custom.
NOTE: All the parameters on the system profile setting screen are available only when
the System Profile option is set to Custom.
CPU Power Management Sets the CPU power management. This option is set to OS DBPM by default. Other option
includes Maximum Performance.
Memory Frequency Sets the speed of the system memory. You can select Maximum Performance or a specific
speed. This option is set to Maximum Performance by default.
Turbo Boost Enables or disables the processor to operate in the turbo boost mode. This option is set to
Enabled by default.
C States Enables or disables the processor to operate in all available power states. C States allow the
processor to enter lower power states when idle. When set to Enabled (OS controlled) or
when set to Autonomous (if hardware controlled is supported), the processor can operate
in all available Power States to save power, but may increase memory latency and frequency
jitter. This option is set to Enabled by default.
Write Data CRC When set to Enabled, DDR4 data bus issues are detected and corrected during 'write'
operations. Two extra cycles are required for CRC bit generation which impacts the
performance. Read-only unless System Profile is set to Custom. This option is set to
Disabled by default.
Memory Patrol Scrub Sets the memory patrol scrub mode. This option is set to Standard by default.
Memory Refresh Rate Sets the memory refresh rate to either 1x or 2x. This option is set to 1x by default.
PCI ASPM L1 Link Power
Management
Enables or disables the PCI ASPM L1 Link Power Management. This option is set to Enabled
by default.
Determinism Slider Set the system determinism by Power Determinism or Performance Determinism. This
option is set to Power Determinism by default.
Efficiency Optimized Mode Efficiency Optimized Mode maximizes Performance-per-Watt by opportunistically reducing
frequency/power. Enables or disables the Efficiency Optimized Mode.
16 Pre-operating system management applications

Table 19. System Profile Settings details (continued)
Option Description
Algorithm Performance
Boost Disable (ApbDis)
Enables or disables the Algorithm Performance Boost Disable (ApbDis). This option is set to
Disabled by default.
XGMI Max Speed This field specifies the processor's maximum XGMI speed.
Dynamic Link Width
Management (DLWM)
Reduces the xGMI link width between sockets from x16 to x8 (default), when no traffic is
detected on the link. This option is set to Unforced by default.
System Security
To view the System Security screen, power on the system, press F2, and click System Setup Main Menu > System BIOS >
System Security.
Table 20. System Security details
Option Description
CPU AES-NI Improves the speed of applications by performing encryption and decryption by using
the Advanced Encryption Standard Instruction Set (AES-NI). This option is set to
Enabled by default.
System Password Sets the system password. This option is set to Enabled by default and is read-only if
the password jumper is not installed in the system.
Setup Password Sets the setup password. This option is read-only if the password jumper is not installed
in the system.
Password Status Locks the system password. This option is set to Unlocked by default.
Table 21. TPM 1.2 security information
Option Description
TPM Security NOTE: The TPM menu is available only when the TPM module is installed.
Enables you to control the reporting mode of the TPM. The TPM Security option is set to Off by
default. You can only modify the TPM Status, and TPM Activation if the TPM Status field is set to
either On with Pre-boot Measurements or On without Pre-boot Measurements.
When TPM 1.2 is installed, the TPM Security option is set to Off, On with Pre-boot Measurements,
or On without Pre-boot Measurements.
When TPM 2.0 is installed, the TPM Security option is set to On or Off. This option is set to Off by
default.
TPM Information Changes the operational state of the TPM. This option is set to No Change by default.
TPM Firmware Indicates the firmware version of the TPM.
TPM Status Specifies the TPM status.
TPM Command Controls the Trusted Platform Module (TPM). When set to None, no command is sent to the TPM.
When set to Activate, the TPM is enabled and activated. When set to Deactivate, the TPM is disabled
and deactivated. When set to Clear, all the contents of the TPM are cleared. This option is set to None
by default.
Table 22. TPM 2.0 security information
Option Description
TPM Information Changes the operational state of the TPM. This option is set to No Change by default.
TPM Firmware Indicates the firmware version of the TPM.
TPM Hierarcy Enables, disables, or clears the storage and endorsement hierarchies. When set to Enabled, the storage
and endorsement hierarchies can be used.
Pre-operating system management applications 17

Table 22. TPM 2.0 security information (continued)
Option Description
When set to Disabled, the storage and endorsement hierarchies cannot be used.
When set to Clear, the storage and endorsement hierarchies are cleared of any values, and then reset
to Enabled.
TPM Advanced
Settings
Specifies TPM Advanced Settings details.
Table 23. System Security details
Option Description
AMD Dynamic Root of Trust
Measurement (DRTM)
Enable/Disable AMD Dynamic Root of Trust Measurement (DRTM)
To enable AMD DRTM, below configurations must be enabled:
1. TPM2.0 must be enabled and the hash algorithm must be set to SHA256.
2. Transparent SME (TSME) must be enabled.
3. Direct Memory Access Protection must be enabled.
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.
AC Power Recovery Delay Sets the time delay for the system to power up after AC power is restored to the
system. This option is set to Immediate by default.
User Defined Delay (60 s to 600
s)
Sets the User Defined Delay option when the User Defined option for AC Power
Recovery Delay is selected.
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.
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.
Table 24. Secure Boot Mode
Options Descriptions
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.
18 Pre-operating system management applications

Table 23. System Security details
Option Description
Table 24. Secure Boot Mode (continued)
Options Descriptions
Audit Mode In Audit mode, PK is not present. The BIOS does not authenticate
programmatic updates to the policy objects, and transitions between
modes. The BIOS performs a signature verification on pre-boot images
and logs the results in the image Execution Information Table, but
executes the images whether they pass or fail verification.
Audit Mode is useful for programmatic determination of a working set
of policy objects.
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.
Creating a system and setup password
Prerequisites
Ensure that the password jumper is enabled. The password jumper enables or disables the system password and setup password
features. For more information, see the System board jumper settings section.
NOTE: If the password jumper setting is disabled, the existing system password and setup password are deleted and you
need not provide the system password to boot the system.
Steps
1. To enter System Setup, press F2 immediately after turning on or rebooting your system.
2. On the System Setup Main Menu screen, click System BIOS > System Security.
3. On the System Security screen, verify that Password Status is set to Unlocked.
4. In the System Password field, type your system password, and press Enter or Tab.
Use the following guidelines to assign the system password:
●A password can have up to 32 characters.
A message prompts you to reenter the system password.
5. Reenter the system password, and click OK.
6. In the Setup Password field, type your setup password and press Enter or Tab.
A message prompts you to reenter the setup password.
7. Reenter the setup password, and click OK.
8. Press Esc to return to the System BIOS screen. Press Esc again.
A message prompts you to save the changes.
NOTE: Password protection does not take effect until the system reboots.
Using your system password to secure your system
About this task
If you have assigned a setup password, the system accepts your setup password as an alternate system password.
Steps
1. Turn on or reboot your system.
Pre-operating system management applications 19

2. Type the system password and press Enter.
Next steps
When Password Status is set to Locked, type the system password and press Enter when prompted at reboot.
NOTE: If an incorrect system password is typed, the system displays a message and prompts you to reenter your password.
You have three attempts to type the correct password. After the third unsuccessful attempt, the system displays an error
message that the system has stopped functioning and must be turned off. Even after you turn off and restart the system,
the error message is displayed until the correct password is entered.
Deleting or changing system and setup password
Prerequisites
NOTE: You cannot delete or change an existing system or setup password if the Password Status is set to Locked.
Steps
1. To enter System Setup, press F2 immediately after turning on or restarting your system.
2. On the System Setup Main Menu screen, click System BIOS > System Security.
3. On the System Security screen, ensure that Password Status is set to Unlocked.
4. In the System Password field, alter or delete the existing system password, and then press Enter or Tab.
5. In the Setup Password field, alter or delete the existing setup password, and then press Enter or Tab.
If you change the system and setup password, a message prompts you to reenter the new password. If you delete the
system and setup password, a message prompts you to confirm the deletion.
6. Press Esc to return to the System BIOS screen. Press Esc again, and a message prompts you to save the changes.
7. Select Setup Password, change, or delete the existing setup password and press Enter or Tab.
NOTE: If you change the system password or setup password, a message prompts you to reenter the new password. If
you delete the system password or setup password, a message prompts you to confirm the deletion.
Operating with setup password enabled
If Setup Password is set to Enabled, type the correct setup password before modifying the system setup options.
If you do not type the correct password in three attempts, the system displays the following message:
Invalid Password! Number of unsuccessful password attempts: <x> System Halted! Must
power down.
Password Invalid. Number of unsuccessful password attempts: <x> Maximum number of
password attempts exceeded.System halted.
Even after you turn off and restart the system, the error message is displayed until the correct password is typed. The following
options are exceptions:
●If System Password is not set to Enabled and is not locked through the Password Status option, you can assign a
system password. For more information, see the System Security Settings screen section.
●You cannot disable or change an existing system password.
NOTE: You can use the password status option with the setup password option to protect the system password from
unauthorized changes.
Redundant OS Control
To view the Redundant OS Control screen, power on the system, press F2, and click System Setup Main Menu > System
BIOS > Redundant OS Control.
20 Pre-operating system management applications