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Chapter 4
Booting and Shutting Down the Operating System
Booting and Shutting Down Linux
165
Booting Red Hat Enterprise Linux
You can boot the Red Hat Enterprise Linux OS on HP Integrity servers using either of the methods described
in this section.
Refer to “Shutting Down Linux” on page 167 for details on shutting down the Red Hat Enterprise Linux OS.
CAUTION ACPI Configuration for Red Hat Enterprise Linux Must Be default
On cell-based HP Integrity servers, to boot the Red Hat Enterprise Linux OS, an nPartition
ACPI configuration must be value set to default.
At the EFI Shell, enter the acpiconfig command with no arguments to list the current ACPI
configuration. If the acpiconfig value is not set to default, then Red Hat Enterprise Linux
could panic. In this situation, you must reconfigure acpiconfig to eliminate any bus address
conflicts and ensure all I/O slots have unique addresses.
To set the ACPI configuration for Red Hat Enterprise Linux:
• At the EFI Shell enter the acpiconfig default command.
• Enter the reset command for the nPartition to reboot with the proper (default)
configuration for Red Hat Enterprise Linux.
Use either of the following methods to boot Red Hat Enterprise Linux:
• Choose a Red Hat Enterprise Linux entry from the EFI Boot Manager menu.
To load the Red Hat Enterprise Linux OS at the EFI Boot Manager menu, choose its entry from the list of
boot options.
Choosing a Linux entry from the boot options list boots the OS using ELILO.EFI loader and the
elilo.conf file.
• Initiate the ELILO.EFI Linux loader from the EFI Shell.
Refer to the procedure “Booting Red Hat Enterprise Linux (EFI Shell)” on page 165 for details.
After choosing the file system for the boot device (for example, fs0:), you can initiate the Linux loader
from the EFI Shell prompt by entering the full path for the ELILO.EFI loader.
On a Red Hat Enterprise Linux boot device EFI System Partition, the full paths to the loader and
configuration files are:
\EFI\redhat\elilo.efi
\EFI\redhat\elilo.conf
By default the ELILO.EFI loader boots Linux using the kernel image and parameters specified by the default
entry in the elilo.conf file on the EFI System Partition for the boot device.
To interact with the ELILO.EFI loader, interrupt the boot process (for example, type a space) at the ELILO
boot prompt. To exit the ELILO.EFI loader, use the exit command.
Booting Red Hat Enterprise Linux (EFI Shell)
Use this procedure to boot Red Hat Enterprise Linux from the EFI Shell.
Refer to “ACPI Configuration for Red Hat Enterprise Linux Must Be default” on page 165 for
required configuration details.
Step 1. Access the EFI Shell.