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Cisco VG202, Cisco VG202XM, Cisco VG204, and Cisco VG204XM Voice Gateways Software Configuration Guide
OL-16191-01
Appendix A Using the ROM Monitor
Using the Configuration Register
Using the Configuration Register
• About Changing the Configuration Register, page A-5
• Changing the Configuration Register Manually, page A-5
• Changing the Configuration Register Using Prompts, page A-5
About Changing the Configuration Register
The virtual configuration register is in nonvolatile RAM (NVRAM) and has the same functionality as
other Cisco voice gateways. You can view or modify the virtual configuration register from either the
ROM monitor or the operating system software. Within the ROM monitor, you can change the
configuration register by entering the register value in hexadecimal format, or by allowing the ROM
monitor to prompt you for the setting of each bit.
Changing the Configuration Register Manually
To change the virtual configuration register from the ROM monitor manually, enter the confreg
command followed by the new value of the register in hexadecimal format, as shown in the following
example:
rommon 1 > confreg 0x2101
You must reset or power cycle for new config to take effect
rommon 2 >
The value is always interpreted as hexadecimal. The new virtual configuration register value is written
into NVRAM but does not take effect until you reset or reboot the voice gateway.
Changing the Configuration Register Using Prompts
Entering the confreg command without an argument displays the contents of the virtual configuration
register and a prompt 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 does not take
effect until you reset or reboot the voice gateway.
The following display shows an example of entering the confreg command:
rommon 7> confreg
Configuration Summary
enabled are:
console baud: 9600
boot: the ROM Monitor
do you wish to change the configuration? y/n [n]: y
enable “diagnostic mode”? y/n [n]: y
enable “use net in IP bcast address”? y/n [n]:
enable “load rom after netboot fails”? y/n [n]:
enable “use all zero broadcast”? y/n [n]:
enable “break/abort has effect”? y/n [n]:
enable “ignore system config info”? y/n [n]:
change console baud rate? y/n [n]: y
enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400 [0]: 0