Software and configuration utilities 159
• In UEFI Boot Mode, Hewlett Packard Enterprise provides legacy USB support in the preboot
environment before the operating system loading for USB 1.0, USB 2.0, and USB 3.0 speeds.
• In Legacy BIOS Boot Mode, Hewlett Packard Enterprise provides legacy USB support in the preboot
environment before the operating system loading for USB 1.0 and USB 2.0 speeds. USB 3.0 ports
can be used with all devices in Legacy BIOS Boot Mode but are not available at USB 3.0 speeds in
the preboot environment. Standard USB support (USB support from within the operating system) is
provided by the OS through the appropriate USB device drivers. Support for USB 3.0 varies by
operating system.
For maximum compatibility of USB 3.0 devices with all operating systems, Hewlett Packard Enterprise
provides a configuration setting for USB 3.0 Mode. Auto is the default setting. This setting impacts USB
3.0 devices when connected to USB 3.0 ports in the following manner:
• Auto (default)—If configured in Auto Mode, USB 3.0 capable devices operate at USB 2.0 speeds in
the preboot environment and during boot. When a USB 3.0 capable OS USB driver loads, USB 3.0
devices transition to USB 3.0 speeds. This mode is compatible with operating systems that do not
support USB 3.0 while allowing USB 3.0 devices to operate at USB 3.0 speeds with state-of-the-art
operating systems.
• Enabled—If Enabled, USB 3.0 capable devices operate at USB 3.0 speeds at all times (including
the preboot environment) when in UEFI Boot Mode. Do not use this mode with operating systems
that do not support USB 3.0. If operating in Legacy Boot BIOS Mode, the USB 3.0 ports cannot
function in the preboot environment and are not bootable.
• Disabled—If configured for Disabled, USB 3.0 capable devices function at USB 2.0 speeds at all
times.
The pre-OS behavior and default operation of the USB ports is configurable in the UEFI System Utilities.
For more information, see the UEFI System Utilities user guide for your product on the Hewlett Packard
Enterprise website (http://www.hpe.com/info/UEFI/docs).
External USB functionality
Hewlett Packard Enterprise provides external USB support to enable local connection of USB devices for
server administration, configuration, and diagnostic procedures.
For additional security, external USB functionality can be disabled through USB options in UEFI System
Utilities.
Redundant ROM support
The server enables you to upgrade or configure the ROM safely with redundant ROM support. The server
has a single ROM that acts as two separate ROM images. In the standard implementation, one side of the
ROM contains the current ROM program version, while the other side of the ROM contains a backup
version.
NOTE: The server ships with the same version programmed on each side of the ROM.
Safety and security benefits
When you flash the system ROM, the flashing mechanism writes over the backup ROM and saves the
current ROM as a backup, enabling you to switch easily to the alternate ROM version if the new ROM
becomes corrupted for any reason. This feature protects the existing ROM version, even if you
experience a power failure while flashing the ROM.
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