Verifying Rom Monitor Mode; Rom Monitor Commands - Cisco 2600 Series Hardware Installation Manual

ROM Monitor Commands

Verifying ROM Monitor Mode

To verify that you are in the ROM monitor mode, check that the prompt displayed on your screen is the
ROM monitor mode prompt:
rommon # >
From the Cisco IOS software, you can configure the router to automatically enter 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 the 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
ROM Monitor Commands
Enter ? or help at the ROM monitor mode prompt to see a list of available commands. For example:
rommon 1 >
alias
boot
break
confreg
cont
context
cookie
dev
dir
dis
dnld
frame
help
history
meminfo
repeat
reset
set
stack
sync
sysret
tftpdnld
unalias
unset
xmodem
rommon 2 >
The Cisco 2691 has these additional ROM monitor commands:
iomemdef
rommon-pref
Note You can end any command by pressing the Break key at the console.
Cisco 2600 Series Routers Hardware Installation Guide
C-2
The is the line number and increases incrementally at each prompt.
#
?
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
monitor builtin command help
monitor command history
main memory information
repeat a monitor command
system reset
display the monitor variables
produce a stack trace
write monitor environment to NVRAM
print out info from last system return
tftp image download
unset an alias
unset a monitor variable
x/ymodem image download
set IO mem to a default 25%
select ROMMON
Appendix C
"Command Descriptions" section on page
Using the ROM Monitor
C-3.
OL-2171-02