Installation guide

E-4 Cisco 4000 Series Installation Guide
Entering the Cisco 4000-M ROM Monitor Program
Table E-1 o Command Options
Note To enable the router to read the configuration file in nonvolatile RAM, clear the
ignore NVRAM contents bit (0x0040) with the config-register command after using the
o/r command.
• Memory/Bus Diagnostic—The t m command runs the memory test. By default, the
memory test examines processor main memory.
Caution Save the configuration in a file on a host in your network as a backup before
testing because the file could be lost.
To test memory, enter the t command with the m option at the > prompt, as follows:
> t m
To use the default addresses and select the default tests, press Return after each prompt
appears.
1. UART= Universal Asynchronous Receiver/Transmitter.
Monitor
Command Function
o Displays the virtual configuration register currently in effect, with a
description of the bits
o/r Resets the virtual configuration register to the defaults as follows:
9600-baud console UART
1
speed
Break/abort has no effect
Ignore the system configuration
Boot from ROM
o/r 0xvalue Sets the virtual configuration register to the (hex) value, value