[c-nsp] SUP720 - not booting - hanging in a loop

[Sven Schade]

Hi,

I have a problem with a SUP720 in a CAT6509 Chassis.
SUP720 is rebooting and the console output is repeating a waiting 
message and is not starting.
I'm unable to break to rommon.

This SUP720 has a blank config, but we saw the same failure on a 2nd 
SUP720 which is fully configured.
After powering down the machine has restarted without a problem. I found 
no Info on google or cisco with this failure - did anyone saw this failure?
Am I doing something wrong? Both machines are run 12.2.33.SXI.
Maybe a problem with the flash? But this is not happening on every reboot.

Any hints?

BR

Svens


--------------------snip----------------------------
FRA3-NEW#reload
Proceed with reload? [confirm]

1w2d: %SYS-SP-3-LOGGER_FLUSHING: System pausing to ensure console 
debugging output.

1w2d: %OIR-SP-6-CONSOLE: Changing console ownership to switch processor





***
*** --- SHUTDOWN NOW ---
***

1w2d: %SYS-SP-3-LOGGER_FLUSHING: System pausing to ensure console 
debugging output.

1w2d: %SYS-SP-5-RELOAD: Reload requested by Delayed Reload. Reload 
Reason: reload.
1w2d: %OIR-SP-6-CONSOLE: Changing console ownership to switch processor



System Bootstrap, Version 8.5(2)
Copyright (c) 1994-2007 by cisco Systems, Inc.
Cat6k-Sup720/SP processor with 1048576 Kbytes of main memory

Autoboot: failed, BOOT string is empty
Autoboot executing command: "boot "

Initializing ATA monitor library...
string is bootdisk:s72033-boot-mz.122-33.SXI.bin
Loading image, please wait ...


Initializing ATA monitor library...

Self extracting the image... [OK]
Self decompressing the image : 
############################################################################################################################################################################################# 
[OK]

              Restricted Rights Legend

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subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.

           cisco Systems, Inc.
           170 West Tasman Drive
           San Jose, California 95134-1706



Cisco IOS Software, s72033_sp Software (s72033_sp-BOOT-M), Version 
12.2(33)SXI, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Fri 07-Nov-08 04:30 by prod_rel_team
Image text-base: 0x40101328, data-base: 0x421B0000


Waiting (slot 5) for supervisor to come online in other slot.  iteration 
= 0 
                 Next Retry will be done after 6 seconds
Waiting (slot 5) for supervisor to come online in other slot.  iteration 
= 1 
                 Next Retry will be done after 6 seconds

----------------------------snip-------------------------------