SEL Troubleshooting Guide

System Event Log Troubleshooting Guide for Intel
®
S5500/S3420 Series Server Boards Chassis Subsystem
Revision 1.1 Intel order number G74211-002 73
10.2 FP (NMI) Interrupt
The front panel interrupt button (also referred to as NMI button) is a recessed button on the front panel that allows the user to force a critical
interrupt which causes a crash error or kernel panic.
Table 74: FP (NMI) Interrupt Sensor Typical Characteristics
Byte
Field
Description
11
Sensor Type
13h = Critical Interrupt
12
Sensor Number
05h
13
Event Direction and
Event Type
[7] Event direction
0b = Assertion Event
1b = Deassertion Event
[6:0] Event Type = 6Fh (Sensor Specific)
14
Event Data 1
[7:6] – 00b = Unspecified Event Data 2
[5:4] – 00b = Unspecified Event Data 3
[3:0] – Event Trigger Offset = 0
15
Event Data 2
Not used
16
Event Data 3
Not used
10.2.1 FP (NMI) Interrupt – Next Steps
The purpose of this button is for diagnosing software issues – when a critical interrupt is generated the OS typically saves a memory dump.
This allows for exact analysis of what is going on in system memory, which can be useful for software developers, or for troubleshooting OS,
software, and driver issues.
If this button was not actually pressed, you should ensure there is no physical fault with the front panel.
This event only gets logged if a user pressed the NMI button, and although it causes the OS to crash, is not an error.