How to determine MCU0 or MCU1 is being flagged an error or false positive

Asset ID:	1-72-1994240.1
Update Date:	2018-05-09
Keywords:

Solution Type Problem Resolution Sure

Solution 1994240.1 : How to determine MCU0 or MCU1 is being flagged an error or false positive

Applies to:

SPARC T4-4 - Version All Versions and later
SPARC T4-1 - Version All Versions and later
SPARC T4-2 - Version All Versions and later
SPARC T3-4 - Version All Versions and later
SPARC T3-1 - Version All Versions and later
Information in this document applies to any platform.

Symptoms

/SYS/MB/CMP1/MCU1 failed to initialize
System Won't Boot. Possible memory issue

[CPU 0:0:0] ERROR: Powering down due to Fatal Error
[CPU 0:0:0] NOTICE: Checking Flash File System
[CPU 0:0:0] NOTICE: Initializing TOD: 2015/03/21 02:04:35
[CPU 0:0:0] NOTICE: Loaded ASR status DB data. Ver. 3.
[CPU 0:0:0] NOTICE: Initializing TPM with:
  tpm_enable = false
  tpm_activate = false
  tpm_forceclear = false
[CPU 0:0:0] NOTICE: TPM found: Ver 1.2, Rev 1.2, SpecLevel 2, errataRev 0, VendorId 'IFX'
[CPU 0:0:0] NOTICE: TPM initialized successfully. Current state is: disabled

[CPU 0:0:0] ERROR: Powering down due to Fatal Error

Changes

The T3-1 and T4-1 systems, the system board fru(/SYS/MB)contains the cpu(/SYS/MB/CMPx),
and the Memory controller (MCU) (/SYS/MB/CMP0/BOBx)integral to it.

The T3-2 and T4-2:For Memory controller (MCU0 & MCU1) is located on the Mother Brd.
Memory errors are most often a result of failed DIMMs but can also can be caused by a faulty memory riser.

The T3-4 and T4-4 Memory controller (MCU) is located ON the PM (Processor Module) not on the MM.

Cause

MCU1 and Memory Dimm had multiple disabled and failure events:
2015-03-21 21:15:08 1:0:0> ERROR: dcal_command failed for MCU1, BoB1, Ch0, DIMM0, Rank0 2015-03-21 21:15:08 1:0:0> ERROR: Setting Burst Length to 4 failed for MCU1
2015-03-21 21:15:08 1:0:0> ERROR: MCU1: DRAM init failed
2015-03-21 21:15:08 1:0:0> ERROR: /SYS/MB/CMP1/MCU1 failed to initialize

-> show components (edited)
Target | Property | Value
/SYS/MB/CMP1/MCU0 | component_state | Enabled
/SYS/MB/CMP1/MCU1 | component_state | Disabled

Solution

Replace dimm from /SYS/MB/CMP1/MR1/BOB1/CH0/D0 fix the issue

References

<NOTE:1994655.1> - T4-2 - ILOM shows a SPT-8000-HR message and a failed MCU
<NOTE:1951488.1> - T3-1/T3-2/T4-1/T4-2, System shut down due to ERROR: Unexpected zero POK value, adjusting state machine

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