I have a a cisco 3640, It had 16MB of flash memory, but I put in another flash simm to make it 32MB, not the router is not able to boot properly. The error message it produces states that the flash in unknown or needs to be formated. It has not been able to boot properly since and into Rommon, even when I only install the original 16MB simm. Is there a way to format the whole 32MB in Rommon?
It is not possible to exchange Flash cards between all devices
and "Flash card must have been formatted in the target platform."
see "PCMCIA Filesystem Compatibility Matrix and Filesystem Information"
Cisco recommends to use the "copy tftp flash:
partition>:" command when you have partitions on the flash.
- First if possible try to format
Formatting Compact Flash Memory Cards