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To edit individual menu entries directly, press Esc to exit the splash screen and get to
the GRUB text-based menu then press E. Changes made in this way only apply to the
current boot and are not adopted permanently.
IMPORTANT: Keyboard Layout during the Boot Procedure
The US keyboard layout is the only one available when booting. See Figure “US
Keyboard Layout” (↑Start-Up).
Editing menu entries facilitates the repair of a defective system that can no longer be
booted, because the faulty conguration le of the boot loader can be circumvented by
manually entering parameters. Manually entering parameters during the boot procedure
is also useful for testing new settings without impairing the native system.
After activating the editing mode, use the arrow keys to select the menu entry of the
conguration to edit. To make the conguration editable, press E again. In this way,
edit incorrect partitions or path specications before they have a negative effect on the
boot process. Press Enter to exit the editing mode and return to the menu. Then press
B to boot this entry. Further possible actions are displayed in the help text at the bottom.
To enter changed boot options permanently and pass them to the kernel, open the le
menu.lst as the user root and append the respective kernel parameters to the existing
line, separated by spaces:
title linux
root(hd0,0)
kernel /vmlinuz root=/dev/sda3 additional parameter
initrd /initrd
GRUB automatically adopts the new parameters the next time the system is booted.
Alternatively, this change can also be made with the YaST boot loader module. Append
the new parameters to the existing line, separated by spaces.
9.1.2 The File device.map
The le device.map maps GRUB and BIOS device names to Linux device names.
In a mixed system containing PATA (IDE) and SCSI hard disks, GRUB must try to
determine the boot sequence by a special procedure, because GRUB may not have access
to the BIOS information on the boot sequence. GRUB saves the result of this analysis
in the le /boot/grub/device.map. Example device.map les for a system
162 Reference
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