启动时循环出现以下提示:
Exception: Illegal Instruction at 0x52E (PC)

System Bootstrap, Version 11.0(10c)XB1, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems
2500 processor with 2048 Kbytes of main memory

F3: 4820908+66020+337920 at 0x3000060

Restricted Rights Legend

Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706



Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-I-L), Version 11.3(3), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1998 by cisco Systems, Inc.
Compiled Mon 20-Apr-98 18:23 by phanguye
Image text-base: 0x03028CDC, data-base: 0x00001000

cisco 2512 (68030) processor (revision N) with 2048K/2048K bytes of memory.
Processor board ID 08862971, with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
1 Token Ring/IEEE 802.5 interface(s)
2 Serial network interface(s)
16 terminal line(s)
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)
--- System Configuration Dialog ---

At any point you may enter a question mark '?' for help.
Use ctrl-c to abort configuration dialog at any prompt.
Default settings are in square brackets '[]'.
Would you like to enter the initial configuration dialog? [yes]:

不停的在这些提示间循环，如果我打N，不初始化，就还是这样的一堆

CTRL+BREAK 进入 ROMMON模式,看到的是下面的信息,命令O查看启动的寄存器值是2142
Abort at 0x11198AE (PC)
>o
Configuration register = 0x2142 at last boot
Bit# Configuration register option settings:
15 Diagnostic mode disabled
14 IP broadcasts do not have network numbers
13 Boot default ROM software if network boot fails
12-11 Console speed is 9600 baud
10 IP broadcasts with ones
08 Break disabled
07 OEM disabled
06 Ignore configuration enabled
03-00 Boot file is cisco2-2500 (or 'boot system' command)
>

如果修改寄存器值到 0x2141启动,则出现下面的信息,打N不初始化就一直循环!

System Bootstrap, Version 11.0(10c)XB1, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems
2500 processor with 2048 Kbytes of main memory
Restricted Rights Legend
Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.
cisco Systems, Inc.
170 West Tasman Drive
San Jose, California 95134-1706

Cisco Internetwork Operating System Software
IOS (tm) 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c)XB1, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1996 by cisco Systems, Inc.
Compiled Wed 10-Sep-97 13:06 by phester
Image text-base: 0x01010000, data-base: 0x00001000
cisco 2512 (68030) processor (revision N) with 2048K/2048K bytes of memory.
Processor board ID 08862971, with hardware revision 00000000
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
1 Token Ring/IEEE 802.5 interface.
2 Serial network interfaces.
16 terminal lines.
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)
--- System Configuration Dialog ---
At any point you may enter a question mark '?' for help.
Use ctrl-c to abort configuration dialog at any prompt.
Default settings are in square brackets '[]'.
Would you like to enter the initial configuration dialog? [yes]:

如果我修改到 2101想从ROM启动IOS,则出现新的错误:

Local Timeout (control reg=0x118) Error, address: 0x4AFC4AFC at 0x1099240 (PC)



Cisco Internetwork Operating System Software
IOS (tm) 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c)XB1, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1996 by cisco Systems, Inc.
Compiled Wed 10-Sep-97 13:06 by phester
Image text-base: 0x01010000, data-base: 0x00001000
cisco 2512 (68030) processor (revision N) with 2048K/2048K bytes of memory.
Processor board ID 08862971, with hardware revision 00000000
X.25 software, Version 2.0, NET2, BFE and GOSIP compliant.
1 Token Ring/IEEE 802.5 interface.
2 Serial network interfaces.
16 terminal lines.
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read/Write)
Local Timeout (control reg=0x118) Error, address: 0x4AFC4AFC at 0x1099240 (PC)
System Bootstrap, Version 11.0(10c)XB1, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Copyright (c) 1986-1997 by cisco Systems
2500 processor with 2048 Kbytes of main memory

不停的循环出现

如果我不能通过路由器在虚拟寄存器的值为0x2101时自动进入rom启动模式：

　　router(boot)>
那么,我是不是要在ROMMON模式中灌IOS,要怎么做才能实现啊?哪位兄弟能帮帮我?ci

>?
$ Toggle cache state
B [filename] [TFTP Server IP address | TFTP Server Name]
Load and execute system image from ROM or from TFTP server
C [address] Continue execution [optional address]
D /S M L V Deposit value V of size S into location L with modifier M
E /S M L Examine location L with size S with modifier M
G [address] Begin execution
H Help for commands
I Initialize
K Stack trace
L [filename] [TFTP Server IP address | TFTP Server Name]
Load system image from ROM or from TFTP server, but do not
begin execution
O Show configuration register option settings
P Set the break point
S Single step next instruction
T function Test device (? for help)

Deposit and Examine sizes may be B (byte), L (long) or S (short).
Modifiers may be R (register) or S (byte swap).
Register names are: D0-D7, A0-A6, SS, US, SR, and PC
>
>

从ROMMON的帮助里看应该打：
L [IOS文件名] [TFTP服务器的IP或主机名]