I have a 3725, which has two memory banks and a maximum DRAM capacity of 256Mb. The flash is a 32Mb CompactFlash card.
The router originally had 128Mb of PC100 SDRAM in one slot, the other slot was empty.
Since I had another working stick of 128Mb PC100 SDRAM (it had recently been harvested from an old webserver whose time with us has come to an end) I decided to install it.
Oddly, as soon as I powered the router back on it wouldn't boot from flash:
loadprog: bad file magic number: 0x0
boot: cannot load "flash:"
Aha, I thought, I must have knocked into the flash card when I installed the DRAM. So I reseated it - still the same. Via rommon, I was able to erase the flash and copy a different image to it using xmodem with no problems, and I could view the contents with dir flash. but as soon as I tried to boot from it, I got the same error.
However, the router was recognising the new DRAM size with no problems, e.g.
System Bootstrap, Version 12.2(8r)T2, RELEASE SOFTWARE (fc1)
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