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Cisco 7201 Installation and Configuration Guide
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Appendix B Using the CompactFlash Disk
Working with 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: or boot system slot0:—Boots the first file in the CompactFlash Disk in
slot 0.
• boot system flash disk0:herfile or boot system slot0:herfile—Boots the file named herfile from the
CompactFlash Disk in slot 0.
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 the CompactFlash Disk slot 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