17
Using the ROM Monitor
OL-5997-02
How to Use the ROM Monitor—Typical Tasks
Prerequisites
To learn about the configuration register and the function of each of the 16 bits, see the Changing the
Configuration Register Settings document.
Restrictions
The modified configuration register value is automatically written into NVRAM, but the new value does
not take effect until you reset or power-cycle the router.
SUMMARY STEPS
1.
confreg [value]
DETAILED STEPS
Examples
In the following example, the configuration register is set to boot the system image from flash memory:
rommon 3 > confreg 0x2102
In the following example, no value is entered; therefore, the system prompts for each bit in the register:
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]: y
enable "load rom after netboot fails"? y/n [n]: y
enable "use all zero broadcast"? y/n [n]: y
enable "break/abort has effect"? y/n [n]: y
enable "ignore system config info"? y/n [n]: y
change console baud rate? y/n [n]: y
enter rate: 0 = 9600, 1 = 4800, 2 = 1200, 3 = 2400 [0]: 0
change the boot characteristics? y/n [n]: y
enter to boot:
0 = ROM Monitor
1 = the boot helper image
2-15 = boot system
Command or Action Purpose
Step 1
confreg [value]
Example:
rommon > confreg 0x2102
Changes the configuration register settings while in ROM
monitor mode.
•
Optionally, enter the new hexadecimal value for the
configuration register. The value range is from 0x0 to
0xFFFF.
•
If you do not enter the value, the router prompts for
each bit of the 16-bit configuration register.
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