Incorrect RIO Voltage Readings reported on T4-4 and T4-2

Asset ID:	1-72-1484120.1
Update Date:	2012-10-01
Keywords:

Solution Type Problem Resolution Sure

Solution 1484120.1 : Incorrect RIO Voltage Readings reported on T4-4 and T4-2

Applies to:

SPARC T4-4 - Version Not Applicable to Not Applicable [Release N/A]
SPARC T4-2 - Version Not Applicable to Not Applicable [Release N/A]
Information in this document applies to any platform.

Symptoms

Messages similar to this are reported:

Sensor | minor: Voltage : /SYS/RIO/VDD_+1V8 : Lower Non-critical going high : reading 1.82 >= threshold 1.71 Volts

Cause

Getting bad readings on A239 power supplies on T4-4 and T4-2 platforms. Data is reading 0 for some amount of time so need to apply post filtering on all devices on that leg of i2c bus to deal with the bad data. On T4-4, RIO/TGB are on the same i2c bus segment as PSU.

Solution

Upgrade to f/w 8.2.0.f or later.

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