Autoboot: failed, BOOT string is empty

CISCO 6506 에서 부팅시 아래와 같은 오류메시지 나오는 경우.

Autoboot: failed, BOOT string is empty

show version 해서 이미지 화일 확인(또는 dir all해서 확인)

Router#show version
Cisco Internetwork Operating System Software
IOS ™ c6sup2_rp Software (c6sup2_rp-DSV-M), Version 12.1(26)E9, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2007 by cisco Systems, Inc.
Compiled Fri 10-Aug-07 13:48 by hqluong
Image text-base: 0x40008F90, data-base: 0x418EC000

ROM: System Bootstrap, Version 12.1(11r)E1, RELEASE SOFTWARE (fc1)
BOOTLDR: c6sup2_rp Software (c6sup2_rp-DSV-M), Version 12.1(26)E9, RELEASE SOFTWARE (fc1)

Router uptime is 13 minutes
Time since Router switched to active is 12 minutes
System returned to ROM by power-on (SP by power-on)
System image file is “sup-bootflash:c6sup22-dsv-mz.121-26.E9.bin”

cisco WS-C6506 (R7000) processor (revision 3.0) with 458752K/65536K bytes of memory.
Processor board ID SAL084660MQ
R7000 CPU at 300Mhz, Implementation 39, Rev 3.3, 256KB L2, 1024KB L3 Cache
Last reset from power-on
Bridging software.
X.25 software, Version 3.0.0.
1 Virtual Ethernet/IEEE 802.3 interface(s)
48 FastEthernet/IEEE 802.3 interface(s)
26 Gigabit Ethernet/IEEE 802.3 interface(s)
381K bytes of non-volatile configuration memory.

32768K bytes of Flash internal SIMM (Sector size 512K).
Configuration register is 0×2142

확인후, boot system [imagefilename] 한다.