NOTE:
Unified EFI Forum, Inc. defines the specification used to implement UEFI. POSSE is a Hewlett
Packard Enterprise extension to UEFI, which provides a common user interface architecture to
better serve Hewlett Packard Enterprise customers, service, and manufacturing.
UEFI consolidates boot utilities similar to those found in PA-RISC based servers, such as the BCH, and
platform firmware into a single platform firmware. UEFI allows the selection of any UEFI OS loader from
any boot medium that is supported by UEFI boot services. An UEFI OS loader supports multiple options
on the user interface.
UEFI supports booting from media that contain an UEFI OS loader or an UEFI-defined server partition.
An UEFI-defined system partition is required by UEFI to boot from a block device.
The UEFI boot manager loads UEFI applications (including the OS first stage loader) and UEFI drivers
from an UEFI-defined file system or image loading service. NVRAM variables point to the file to be
loaded. These variables contain application-specific data that is passed directly to the UEFI application.
UEFI variables provides system firmware a boot menu that points to all the operating systems, even
multiple versions of the same operating systems.
The UEFI boot manager allows you to control the server booting environment. Depending on how you
have configured the boot options, after the server is powered up the boot manager presents you with
different ways to bring up the server blade. For example, you can boot to the UEFI shell, to an operating
system located on the network or residing on media in the server, or the Boot Maintenance Manager.
UEFI Shell and POSSE commands
For more information on these commands, enter help command at the UEFI Shell prompt.
Table 18: UEFI Shell Commands
UEFI Shell Command Definition
? Displays the UEFI Shell command list or verbose command help
alias Displays, creates, or deletes UEFI Shell aliases
attrib Displays or changes the attributes of files or directories
autoboot Set/View autoboot timeout and retries
bcfg Display/Modify the driver/boot configuration
boottest Turn specific speedyboot bits on or off
cd Displays or changes the current directory
cls Clears standard output and optionally changes background
color
comp Compares the contents of two files
conconfig Configure consoles and set/view primary operating system
console
Table Continued
142 UEFI Shell and POSSE commands
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