From a question on groupstudy; the following output was posted of a Cisco 2600 that did not boot up even after the Flash was upgraded to 32MB??????
System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1) Copyright (c) 2000 by cisco Systems, Inc. C2600 platform with 65536 Kbytes of main memory program load complete, entry point: 0x80008000, size: 0x1c8a8e4 Error : memory requirements exceed available memory Memory required : 0x04746F90 *** System received a Software forced crash *** signal= 0x17, code= 0x4, context= 0x80080630 PC = 0x0, Vector = 0x0, SP = 0x0 System Bootstrap, Version 12.1(3r)T2, RELEASE SOFTWARE (fc1) Copyright (c) 2000 by cisco Systems, Inc. C2600 platform with 65536 Kbytes of main memory program load complete, entry point: 0x80008000, size: 0x1c8a8e4 Error : memory requirements exceed available memory Memory required : 0x04746F90 rommon 1 > dir flash: File size Checksum File name 29928068 bytes (0x1c8aa84) 0x6ee9 c2600-adventerprisek9-mz.124-23.bin rommon 2 >
What could the problem be?
The error tells what the problem is. Convert the 0x04746F90 to decimal to get 74739600 = 74.73MB
According to the error, the image (c2600-adventerprisek9-mz.124-23.bin) being loaded, requires at least 74.73MB of DRAM. The flash memory which was upgraded was not the issue, since that only holds the IOS image.
My suggestion? Always goto Cisco Feature Navigator or short URL http://www.cisco.com/go/fn to see the DRAM/Flash memory requirements before just downloading the IOS image.
As per the FN page the recommended required memory for this image c2600-adventerprisek9-mz.124-23.bin is (DRAM/Min Flash : 128/32)
Routing-Bits 
Sure Dude, thanks for sharing. Nice Stuff.