Bucket of pain. The 2500 series routers can have 16Mb of RAM and 16Mb of flash. It stores the OS, called IOS in the flash. The config goes in NVRAM and the boot stuff goes in the boot rom.
I have two routers with two banks of 8Mb flash and it was a mother to upgrade one of them.
The first router upgraded fine with the classic copy tftp: flash: syntax. It erased the old IOS and put the new one on over and away it went (only had to good with the conf reg once 0x2142 to get rid of a config with a password I forgot).
The second one was pain. The two Flash banks showed up seperate, the copy tftp: flash: spat back READ ONLY FILE SYSTEM... so on and so forth.
Here was the fix:
conf 0x2101 (this boots a rom or cut down IOS).
partition 1 16 (make one big 16Mb partition instead of two 8s)
copy tftp flash
conf 0x2102
The 2500 is great for a lab, but don't use one in production. The new ISR routers are quite nice.
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