6-9
Cisco 7304 Network Service Engine Installation and Configuration
OL-3967-01
Chapter 6 Working with a CompactFlash Disk
Enabling Booting from a CompactFlash Disk
Enabling Booting from a CompactFlash Disk
This section explains how to enable booting from a CompactFlash Disk.
To enable booting from a CompactFlash Disk, set configuration register bits 3, 2, 1, and 0 to a value
between 2 and 15 in conjunction with the
boot system
[
disk0:
]
filename
configuration command. This
section includes only descriptions of
boot
commands specific to the CompactFlash Disk. (You can use
either the
slotn:
argument or the
diskn:
argument for
boot
commands.)
Following are definitions of the various CompactFlash Disk-related
boot
commands:
•
boot system flash disk0:
—Boots the first file in the CompactFlash Disk.
•
boot system flash bootdisk:
—Boots the first file in the CompactFlash Disk.
•
boot system flash disk0:
herfile
—Boots the file named
herfile
from the CompactFlash Disk.
•
boot system flash bootdisk:
hisfile
—Boots the file named
hisfile
from the CompactFlash Disk.
Note
As you enter
boot
commands, pay attention to how you use the Spacebar, which influences the way your
system interprets the commands. Also, ensure that you define the entire path to a file as you enter the
boot
commands; otherwise, the system might not be able to find the file.
For example, notice the difference in the following correct and incorrect commands:
System(config)#
boot system flash disk0:myfile
Based on the preceding correct command, the system boots the file specified (
myfile
).
System(config)#
boot system flash disk0: myfile
Based on the preceding incorrect command, the system finds the
filename
field blank because there is a
space after
disk0:
. In this case, the system ignores the filename argument and boots the first file on the
CompactFlash Disk, which might not be the file called
myfile
.
Use the following procedure to enable booting the file
myfile
from a CompactFlash Disk:
Step 1
Enter configuration mode and specify an image filename in disk0: from which to boot by using the
configure terminal
command, as follows:
System#
configure terminal
Enter configuration commands, one per line. End with CTRL-Z.
System(config)#
boot system flash disk0:myfile
Step 2
Enable the
boot system flash disk0:
myfile
command using the
config-register
command with the
hexadecimal value shown in the following example:
System(config)#
config-reg 0x2102
This command, with the hexadecimal value 0x2102, results in the following:
•
Enables the system to boot the default boot ROM software if the CompactFlash Disk-based image
fails to boot—hexadecimal value 0x2000
•
Disables Break—hexadecimal value 0x0100
•
Enables the image
myfile
as the default boot image—hexadecimal value 0x0002
Step 3
Press
Ctrl-Z
to exit configuration mode:
System(config)#
