T5-2 System shows Unexpected Event 8400 ff000XXX right after the banner on boot

(Doc ID 2339410.1)

Last updated on DECEMBER 18, 2017

Applies to:

SPARC T5-2 - Version All Versions and later
Information in this document applies to any platform.

Symptoms

 System will show 8400 ff000XXX right after the banner while booting.

Examples:

Unexpected Event 8400 ff000100 
Unexpected Event 8400 ff000170 
Unexpected Event 8400 ff000180 

This will occur only on boot, will only occur with Solaris 10, and only on newer firmware (9.6.x).

This error only occurs when the system is attached to a screen via USB regardless of what the input-device variable is.

Changes

 Updating the OS to S11 will clear the issue as well, as it's not present in S11 installs on the same systems due to how S11 handles OBP USB code.

Cause

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