- Problem Statement:

Late_Write type E$ dimms will fail POST.

- Symptoms:

FAIL E$Dimm SBXX/PX/E0: Not compatible with processor type.

A. The following failure is seen after replacing a CPU/MEM board from an RSL. A setkeyswitch
on operation fails to configure in the new system board:

stage cpu_probe: CPU Module probe...
FAIL E$Dimm SB14/P1/E0: Not compatible with processor type.
Primary service FRU is Slot SB14.
FAIL E$Dimm SB14/P1/E1: Not compatible with processor type.
Primary service FRU is Slot SB14.
FAIL Proc SB14/P1: Rated frequency (0) lower than majority (900)
Primary service FRU is Slot SB14.                  

- Troubleshooting:

A. Dump the E$ DIMM container from the prtfru output to determine the E$ DIMM type
and part number

~ prtfru "/frutree/chassis/CP/ex14?Label=ex14/EXB/sb14?Label=sb14/CPU/p0?Label=p0/e1?Label=e1/ECACHE"
SEGMENT: SD
   /ManR
   /ManR/UNIX_Timestamp32: Tue Feb 27 15:29:19 GMT 2001
   /ManR/Fru_Description: 4MB Ecache Module                                                               
   /ManR/Manufacture_Loc: Celestica Toronto, Canada                                       
   /ManR/Sun_Part_No: 3704125
   /ManR/Sun_Serial_No: 492UBT
   /ManR/Vendor_Name: Sony
   /ManR/Initial_HW_Dash_Level: 01
   /ManR/Initial_HW_Rev_Level: 35
   /ManR/Fru_Shortname: ECACHE          
   /Fru_Type: 4MB Ecache
   /Ecache_Mode: Late_Write
   /Ecache_Module_IDR (1 iterations)
   /Ecache_Module_IDR[0]
   /Ecache_Module_IDR[0]/Lot_Code: 049Y78F     
   /Ecache_Module_IDR[0]/Date_Code:         
   /EcacheR
   /EcacheR/SRAM_Speed: 250
   /EcacheR/SRAM_Size: 4
</FRUID_XML_Tree>

- Resolution:

A. Replace system board.

- Summary of part number and patch ID's 

CPU/MEM system board:  540-5052
Late_Write E$ Dimm  :  370-4125
Late_Select E$ Dimm :  370-4128

- References and bug IDs

4705197: cheetah+ incompatible E$ DIMMS not recognized
4703921: Processor should be crunched on bad E$, not failed

- Additional background information:

A. System boards which have been tested in the repair cycle on 3800/4800/6800 servers
do not recognize the incompatible DIMM types and are restocked. When the part is order
and installed in an SF15K/12K, the failure is encountered. 

B. Serengeti supports late write and late select ecache mode dimms for cheetah+, but
there is a policy change that requires only late select mode is used for cheetah+.

C. Starcat post has been changed so that only the processor with the associated
E$ Dimms will be failed by POST.

D. SCapp version 5.13.3 will warn that this configuration is present in the Serengeti
servers. SCapp 5.14.0 will fail the associated processor.

- Meta-Data/Problem categorization:

Product/Platform: SF15K 
Category:
 
- Keywords

ecache E$ dimm Late_Write Late_Select