image loading problem on router 3640

[ahmed-hassan1110]

I have Cisco 3640 Router and have a problem when the router boots it shows an error message and the router enters the rommon mode.

Here is the error message:

System Bootstrap, Version 11.1(20)AA2, EARLY DEPLOYMENT RELEASE SOFTWARE (fc1)

C3600 processor with 16384 Kbytes of main memory

Main memory is configured to 32 bit mode with parity disabled

ERROR: Illegal system memory (DRAM) configuration.

The current system memory configuration is:

SIMM 0 SIMM 1 SIMM 2 SIMM 3

--------------------------------------

32M-DUAL

Use "meminfo -l" to see the valid configurations.

ERROR: Illegal system memory (DRAM) configuration.

The current system memory configuration is:

SIMM 0 SIMM 1 SIMM 2 SIMM 3

--------------------------------------

32M-DUAL

Use "meminfo -l" to see the valid configurations.

Unable to boot due to illegal DRAM configuration ? aborting

rommon 1 > meminfo -l

Supported 64 bit configurations:

SIMM 0 SIMM 1 SIMM 2 SIMM 3

--------------------------------------

4M 4M 4M 4M

8M 8M

8M-DUAL 8M-DUAL

8M 8M 4M

8M-DUAL 8M-DUAL 4M 4M

8M 8M 8M 8M

8M 8M 8M-DUAL 8M-DUAL

8M-DUAL 8M-DUAL 8M 8M

8M-DUAL 8M-DUAL 8M-DUAL 8M-DUAL

16M 16M

16M 16M 4M 4M

16M 16M 8M 8M

16M 16M 8M-DUAL 8M-DUAL

16M 16M 16M 16M

32M-DUAL 32M-DUAL

32M-DUAL 32M-DUAL 4M 4M

32M-DUAL 32M-DUAL 8M 8M

32M-DUAL 32M-DUAL 8M-DUAL 8M-DUAL

32M-DUAL 32M-DUAL 16M 16M

32M-DUAL 32M-DUAL 32M-D

Supported 32 bit configurations:

SIMM 0 SIMM 1 SIMM 2 SIMM 3

--------------------------------------

4M

4M 4M

4M 8M

4M 16M

4M 4M 4M

4M 4M 8M

8M

8M 4M

8M 16M

8M 8M 4M

8M 8M 8M

8M 8M 16M

8M 8M 4M 8M

8M 8M 8M 4M

16M

16M 4M

16M 8M

16M 16M 4M

16M 16M 8M

16M 16M 16M

16M 16M 4M 8M

16M 16M 4M 16M

16M 16M 8M 4M

16M 16M 8M 16M

16M 16M 16M 4M

16M 16M 16M 8M

rommon 2 >

I tried 2 other DRAMs from another working router and the same error message appeared, note that this router was previously working properly.

So please do you have any idea about what could fix this problem.

[mheusinger]

Hi,

Do you install two 32M RAM modules or only one? If two are present and they are operational in another router it could be a hardware failure in SIMM1.

There is little to do then except trying to use the second RAM f.e in SIMM2. If this fails then you might replace the router.

Regards, Martin

[smothuku]

Hi ,

What is happening is that the second DRAM SIMM sometimes isn't detected or isn't working correctly. Whenever this happens the Rom Monitor of the 3640 will generate this error message (either on power-up or during reload):

ERROR: Illegal system memory (DRAM) configuration.

The current system memory configuration is:

SIMM 0 SIMM 1 SIMM 2 SIMM 3

--------------------------------------

32M-DUAL

Possibly the SIMM itself is bad or there could be a problem with the Mainboard of the 3640. Before RMAing this again, please

remove each of the DRAM SIMMs from their

sockets and then replace them carefully.

Check whether the DRAM's seated in bank's properly or not.

Thanks,

satish