I2C bus noise causing unexpected outages on T4-4 due to PSU vendor mismatch (Doc ID 2067274.1)

Last updated on MAY 01, 2017

Applies to:

SPARC T4-4 - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

 In some rare cases, a system sporting at least one power supply different from the others (Either Astec or Power One) may cause sufficient bus noise on the I2C bus to cause erroneous behaviour.

This behaviour includes, but not limited to:

Outages

Power offs

Sensor errors

Etc.

 

An example of erroneous power off:

11718  Tue Aug  4 04:42:56 2015  Power     On        major          Power to /SYS has been turned on by: Shell session, Username:root
11717  Tue Aug  4 04:31:36 2015  System    Log       minor          Host: Powered Off
11716  Tue Aug  4 04:31:36 2015  System    Log       minor          System power off has been requested via power button.  <--------------
11715  Tue Aug  4 04:31:32 2015  System    Log       minor          Host: Host shutting down
11714  Tue Aug  4 04:31:32 2015  System    Log       minor          System shutdown has been requested.  <---------

 

Aug  4 10:14:31 unix: WARNING: Power-off requested, system will now shutdown.  <------------
Shutdown started.    Tuesday, August  4, 2015 10:14:32 AM IST
Changing to init state 5 - please wait
Broadcast Message from root (msglog) Tue Aug  4 10:14:32...
THE SYSTEM IS BEING SHUT DOWN NOW ! ! !
Log off now or risk your files being damaged
2015-08-04 04:54:49  0:0:0> NOTICE:  Loaded ASR status DB data. Ver. 4.
2015-08-04 04:54:52  0:0:0> NOTICE:  Initializing TPM with:
tpm_enable = false
tpm_activate = false
tpm_forceclear = false
2015-08-04 04:54:52  0:0:0> NOTICE:  TPM found: Ver 1.2, Rev 1.2, SpecLevel 2, errataRev 0, VendorId 'IFX'
2015-08-04 04:54:53  0:0:0> NOTICE:  TPM initialized successfully. Current state is: disabled
2015-08-04 04:54:53  2:0:0> NOTICE:  Serial#:   000000000000002a.0158c4c07e0b357b
2015-08-04 04:54:53  3:0:0> NOTICE:  Serial#:   000000000000002a.015a50c07e0b31aa
2015-08-04 04:54:53  0:0:0> NOTICE:  Serial#:   000000000000046a.235a50c07d842b73
2015-08-04 04:54:53  1:0:0> NOTICE:  Serial#:   00000000000004ea.275b58c07d842bac
2015-08-04 04:54:54  2:0:0> NOTICE:  Version:   003e003013030607
2015-08-04 04:54:54  3:0:0> NOTICE:  Version:   003e003013030607
2015-08-04 04:54:54  0:0:0> NOTICE:  Version:   003e003012030607
2015-08-04 04:54:54  1:0:0> NOTICE:  Version:   003e003012030607
2015-08-04 04:54:54  2:0:0> NOTICE:  T4 Revision: 1.3

 

This is done without any manual intervention or any commands' input.

Cause

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