Sup720 SP Rommon looses confreg and config; nvram corrupted
I have a Sup720. At boot up it (SP) says:
System Bootstrap, Version 8.4(2) Release
Copyright (c) 1994-2005 by cisco Systems, Inc.
Testing lower main memory - data equals address
Testing lower main memory - checkerboard
Testing lower main memory - inverse checkerboard
Clearing lower memory for cache initialization
Clearing autoboot state machine
Reading monitor variables from NVRAM
Warning: Rommon NVRAM area is corrupted. Initialize the area to default values
Reset reason for CPU board 0xffff , BaseBoard 0x200ffff, display 0x0
System Reset by Power On.
Initializing required TLB entries
Initializing main memory
Initializing PCMCIA controller
Cat6k-Sup720/SP processor with 524288 Kbytes of main memory
rommon 1 >
When i issue the 'confreg 0x2102' command and then the 'boot' command all goes well. The Sup720 boots up and i can configure it. Both SP and RP confreg's are now 0x2102. A reload via the 'reload' command works fine. Supervisor starts fine.
When however i switch the power supply off/on nvram is corrupted again.
First i thought about FN27595 (broken crystal) but that's only for older hardware revisions.
I even tried 'nvram_erase' but that's only for RP, not SP.
Assuming this NVRAM is really 'non volatile' (so no dead batteries), what can cause this problem?
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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