Specifications

Reference 3-3
Enabling Booting from Flash Memory
Enabling Booting from Flash Memory
To enable booting from Flash memory, set configuration register bits 3, 2, 1, and 0 to a value
between 2 and 15 in conjunction with the boot system flash [filename] configuration
command.
To enter the configuration mode, while in the system software image specify a Flash
filename from which to boot, enter the configure terminal command at the enable prompt,
as in the example following:
router# configure terminal
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 the value shown in the example following:
router# config term
Enter configuration commands, one per line.
Edit with DELETE, CTRL/W, and CTRL/U; end with CTRL/Z
config-reg 0x2102
^Z
router#
Copying to Flash Memory
Copying a new image to Flash memory might be required whenever a new image or
maintenance release becomes available. To copy a new image into Flash memory (write to
Flash memory), you must first reboot from ROM and then copy the new image into Flash
memory. You cannot copy a new image into Flash memory while the system is running
from Flash memory. Use the copy tftp flash command for the copy procedure.