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Entering the ROM Monitor Mode
To enter the ROM monitor mode, do the following:
Configuring
Step 1
Step 2
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.
From the Cisco IOS software, you can configure the router to automatically enter the ROM monitor
Tip
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
boot
break
confreg
cont
context
cookie
dev
dir
dis
dnld
frame
fpga-pref
help
history
meminfo
repeat
Cisco VG224 Voice Gateway Software Configuration Guide
C-2
Command or Action
Router> reload
Press the Break key during the first 60 seconds while
the system is starting up.
?
set and display aliases command
boot up an external process
set/show/clear the breakpoint
configuration register utility
continue executing a downloaded image
display the context of a loaded image
display contents of cookie PROM in hex
list the device table
list files in the file system
display instruction stream
serial download a program module
print out a selected stack frame
select an FPGA
monitor builtin command help
monitor command history
main memory information
repeat a monitor command
Appendix C
Using the ROM Monitor
Purpose
Restarts the Cisco VG224.
Forces the router to stop booting
and enter the ROM monitor mode.
OL-5005-01
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