Hardware problem with a 2511

Unanswered Question
May 21st, 2009
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I've got an old 2511 that is meant to join my CCNA study home lab, but it suffers from an h/w issue.

- It can boot from its ROM 4.14(9.1), without reporting any faulty part

- It can read/erase/write the flash when booting from ROM

- but, when booting from flash, or if instructed to load ios via tftp, as soon as it prints to the "Image text-base:xxxx data-base:yyyy" message it hangs there and never completes the bootup.

I tried several combinations of additional DRAM/Flash modules, to verify that it does not depend from them.

Interestingly, I noticed that if I swap the ROM chips with a slightly newer version 5.2 the same problem happens also while booting from ROM.

Do you have any suggestion on what can be malfunctioning? My bets so far are the built-in RAM or some memory address decoding circuitry.

P.S. Consumeristic approaches like "Faulty? Dump it!" are not welcome. This is a learning engineering platform :)

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