Configuration Register Commands - Cisco 2600 Series Hardware Installation Manual

Appendix C Using the ROM Monitor
•
rommon 8 > sysret
System Return Info:
count: 19,
pc:0x802b1040,
Stack Trace:
FP: 0x80908398, PC: 0x802b102c
FP: 0x809083b0, PC: 0x802b0b88
FP: 0x809083d8, PC: 0x8017039c
FP: 0x809083e8, PC: 0x8016f764

Configuration Register Commands

The virtual configuration register resides in NVRAM. You can view or modify the virtual configuration
register from either the ROM monitor or the operating system software.
To change the virtual configuration register from the ROM monitor, enter confreg by itself for menu
mode, or enter the new value of the register in hexadecimal.
•
rommon 7 > confreg
enabled are:
break/abort has effect
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n
enable
enable
enable
enable
disable "break/abort has effect"? y/n
enable
change console baud rate? y/n
enter rate: 0 = 9600,
change the boot characteristics? y/n
enter to boot:
0 = ROM Monitor
1 = the boot helper image
2-15 = boot system
enabled are:
diagnostic mode
OL-2171-02
sysret—View return information from the last booted system image. This information includes the
reason for terminating the image, a stack dump of up to eight frames, and, if an exception is
involved, the address where the exception occurred. For example:
reason: a SegV exception
error address: 0x802b1040
confreg [hexnum]—Change the virtual configuration register to the value specified. The value is
always interpreted as hexadecimal. Entering confreg without an argument displays the contents of
the virtual configuration register and prompts you to alter the contents by describing the meaning of
each bit.
In either case, the new virtual configuration register value is written into NVRAM, but is not
effective until you reset or power cycle the router.
The following display shows an example of the confreg command:
Configuration Summary
"diagnostic mode"? y/n
"use net in IP bcast address"? y/n
"load rom after netboot fails"? y/n
"use all zero broadcast"? y/n
"ignore system config info"? y/n
1 = 4800,
4 = 19200, 5 = 38400, 6 = 57600, 7 = 115200
[0]: 0
Configuration Summary
[n]: y
[n]: y
[n]:
[n]:
[n]:
[n]:
[n]:
[n]: y
2 = 1200, 3 = 2400
[n]: y
Cisco 2600 Series Routers Hardware Installation Guide
Command Descriptions
[0]: 0
C-5