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Cisco VG224 Voice Gateway Software Configuration Guide
OL-5005-01
Appendix C Using the ROM Monitor
Entering the ROM Monitor Mode
To enter the ROM monitor mode, do the following:
Configuring
Verifying
To verify that you are in ROM monitor mode, check that the prompt displayed on your screen is the ROM
monitor mode prompt:
rommon # >
The # is the line number and increases incrementally at each prompt.
Tip From the Cisco IOS software, you can configure the router to automatically enter the ROM monitor
mode the next time the router boots by setting virtual configuration register bits 3, 2, 1, and 0 to zero.
From the console, enter the following configuration command:
configuration-register 0x0
The new configuration register value, 0x0, is effective after the router is rebooted with the reload
command. The router remains in ROM monitor and does not boot the operating system.
As long as the configuration register value remains 0x0, you must manually boot the operating system
from the console. Refer to the boot command in the section “Command Descriptions” later in this
appendix.
ROM Monitor Commands
Enter ? or help at the ROM monitor mode prompt to display a list of available commands. For example:
rommon 1 > ?
alias set and display aliases command
boot boot up an external process
break set/show/clear the breakpoint
confreg configuration register utility
cont continue executing a downloaded image
context display the context of a loaded image
cookie display contents of cookie PROM in hex
dev list the device table
dir list files in the file system
dis display instruction stream
dnld serial download a program module
frame print out a selected stack frame
fpga-pref select an FPGA
help monitor builtin command help
history monitor command history
meminfo main memory information
repeat repeat a monitor command
Command or Action Purpose
Step 1
Router> reload
Restarts the Cisco VG224.
Step 2
Press the Break key during the first 60 seconds while
the system is starting up.
Forces the router to stop booting
and enter the ROM monitor mode.