Booting the Red Hat Linux Operating System

You can boot the Red Hat Linux operating system on HP Integrity servers using either of the methods described in this section.

See “Shutting Down Linux” for details on shutting down the Red Hat Linux operating system.




	CAUTION: ACPI Configuration for Red Hat Linux 3 Must Be “single-pci-domain”. On nPartition-capable HP Integrity servers, to boot the Red Hat Linux 3 operating system an nPartition must have its ACPI configuration value set to `single-pci-domain`. 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 `single-pci-domain`, then Red Hat 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 Linux 3: at the EFI Shell enter the acpiconfig single-pci-domain command, and then enter the reset command for the nPartition to reboot with the proper (`single-pci-domain`) configuration for Red Hat Linux 3.

Use either of these methods to boot Red Hat Linux:

Select a Red Hat Linux entry from the EFI Boot Manager menu.
To load the Red Hat Linux operating system at the EFI Boot Manager menu, select its entry from the list of boot options.
Selecting a Linux entry from the boot options list boots the operating system using ELILO.EFI loader and the elilo.conf file.
Invoke the ELILO.EFI Linux loader from the EFI Shell.
See the procedure “Red Hat Linux Operating System Booting from the EFI Shell” for details.
On a Red Hat Linux boot device EFI System Partition, the full paths to the loader and configuration files are:
\EFI\redhat\elilo.efi
\EFI\redhat\elilo.conf
After selecting the filesystem for the boot device (for example, fs0:) you can invoke the Linux loader from the EFI Shell prompt by entering the full path for the ELILO.EFI loader.

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.

Procedure A-9 Red Hat Linux Operating System Booting from the EFI Shell

Use this procedure to boot Red Hat Linux from the EFI Shell.

See “ACPI Configuration for Red Hat Linux 3 Must Be “single-pci-domain”” for required configuration details.

Access the EFI Shell.
From the system console, select the EFI Shell entry from the EFI Boot Manager menu to access the shell.
Access the EFI System Partition for the Red Hat Linux boot device.
Use the map EFI Shell command to list the filesystems (fs0, fs1, and so on) that are known and have been mapped.
To select a filesystem to use, enter its mapped name followed by a colon (:). For example, to operate with the boot device that is mapped as fs3, enter fs3: at the EFI Shell prompt.
Enter ELILO at the EFI Shell command prompt to launch the ELILO.EFI loader.
If needed, you can specify the loader’s full path by entering \EFI\redhat\elilo at the EFI Shell command prompt.
Allow the ELILO.EFI loader to proceed with booting the Red Hat Linux kernel.
By default, the ELILO.EFI loader boots the kernel image and options specified by the default item in the elilo.conf file.
To interact with the ELILO.EFI loader, interrupt the boot process (for example, type a space) at the ELILO boot prompt. To exit the loader use the exit command.

Booting the Red Hat Linux Operating System

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