B-6 Cisco 4000 Series Hardware Installation and Maintenance
Virtual Configuration Register Settings
Enabling Booting from Flash Memory
To enable booting from Flash memory, set bits 3, 2, 1, and 0 to a value between 2 through 15. To
specify a filename to boot, enter the system software configuration command boot system flash
filename in the configuration file.
To enter the configuration mode while in the system software image, enter the configure command
at the enable prompt as in the example following:
Gateway# configure
Configuring from terminal, memory, or network [terminal]? term
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z
boot system flash filename
To disable break and enable the boot system flash command, enter the config-register command
with a value as follows:
config-reg 0x102
CTRL/Z
If you set the configuration register value to 0x102, as in the example, it is not necessary to enter the
boot system flash command unless there is more than one image in Flash.
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