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SUP720 NVRAM corrupted ROMMON back to default values


When I power on my 6500/SUP720, it says :

System Bootstrap, Version 7.7(1)

Copyright (c) 1994-2003 by cisco Systems, Inc.

Testing lower main memory - data equals address

Testing lower main memory - checkerboard

Testing lower main memory - inverse checkerboard

Clearing lower 16K memory for cache initialization

Clearing bss

Reading monitor variables from NVRAM

Warning: Rommon NVRAM area is corrupted. Initialize the area to default values

Enabling interrupts

Initializing TLB

Initializing cache

Initializing required TLB entries

Initializing main memory

Sizing NVRAM

Initializing PCMCIA controller

Exiting init

Cat6k-Sup720/SP processor with 524288 Kbytes of main memory

rommon 1 >

After issueing the 'confreg 0x2102' command and then the 'boot' command all goes well. The Sup720 correctly boots up. I can configure it and reload it (by reload command). But when powering off/on, nvram is corrupted again.

I found the FN27595 (CSCec34824) and it seems my board is impacted (serial number + hardware revision).

The solution is not clearly explained : do I really have to change the entire SUP720 ? What if the SUP720 is not maintained anymore (bought in 2003)?

Do I have to buy a brand new one ?

Can it be repaired ?

I saw in another post that replacing the on boad battery had solved a similar problem ...

Somebody help me please ?

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