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Fujitsu M12-2/M12-2S Servers: Memory Maintenance can Result in Error "Window size is too small (write VrefDQ training)" Error 02001426 (Doc ID 2274237.1)

Last updated on MARCH 25, 2021

Applies to:

Fujitsu SPARC M12-2S - Version All Versions and later
Fujitsu SPARC M12-2 - Version All Versions and later
All Platforms

Symptoms

When a system with both memory groups A and B installed on either the CMUU or CMUL, and a memory DIMM is added or replaced, a PPAR poweron might fail with the error:

Window size is too small (write VrefDQ training)

Date: Jul 10 10:20:13 HKT 2017
 Code: 40002000-004b850134220000ff-020014260000000000000000
 Status: Warning Occurred: Jul 10 10:20:13.684 HKT 2017
 FRU: /BB#0/CMUL/MEM#03B,/BB#0/CMUL
 Msg: Window size is too small (read VrefDQ training)
 Diagnostic Code:
 00000b00 00000000 0000
 00000001 00000000 0000
 00000000 00000000 0000
 00000000 00000000 00000000 00000000
 00000000 00000000 0000

Changes

The addition or replacement of a memory DIMM.

Cause

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