82801FB Datasheet, PDF (178/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

Functional Description
and would prevent an operating system’s device driver from sending or receiving some
messages.
3. A system that has locked up and can not be restarted with power button press is assumed to
have broken hardware (bad power supply, short circuit on some bus, etc.), and is beyond
ICH6’s recovery mechanisms.
4. A spurious alert could occur in the following sequence:
— The processor has initiated an alert using the SEND_NOW bit
— During the alert, the THRM#, INTRUDER# or GPI[11] changes state
— The system then goes to a non-S0 state.
Once the system transitions to the non-S0 state, it may send a single alert with an incremental
SEQUENCE number.
5. An inaccurate alert message can be generated in the following scenario
— The system successfully boots after a second watchdog Timeout occurs.
— PWROK goes low (typically due to a reset button press) or a power button override
occurs (before the SECOND_TO_STS bit is cleared).
— An alert message indicating that the processor is missing or locked up is generated with a
new sequence number.
Table 5-39 shows the data included in the Alert on LAN messages.
Table 5-39. Heartbeat Message Data
Field
Cover Tamper Status
Temp Event Status
Processor Missing Event
Status
TCO Timer Event Status
Software Event Status
Unprogrammed Firmware
Hub Event Status
GPIO Status
SEQ[3:0]
System Power State
MESSAGE1
MESSAGE2
WDSTATUS
Comment
1 = This bit is set if the intruder detect bit is set (INTRD_DET).
1 = This bit is set if the Intel^® ICH6 THERM# input signal is asserted.
1 = This bit is set if the processor failed to fetch its first instruction.
1 = This bit is set when the TCO timer expires.
1 = This bit is set when software writes a 1 to the SEND_NOW bit.
1 = First BIOS fetch returned a value of FFh, indicating that the Firmware Hub
has not yet been programmed (still erased).
1 = This bit is set when GPI[11] signal is high.
0 = This bit is cleared when GPI[11] signal is low.
An event message is triggered on an transition of GPI[11].
This is a sequence number. It initially is 0, and increments each time the ICH6
sends a new message. Upon reaching 1111, the sequence number rolls over to
0000. MSB (SEQ3) sent first.
00 = G0, 01 = G1, 10 = G2, 11 = Pre-Boot. MSB sent first
Will be the same as the MESSAGE1 Register. MSB sent first.
Will be the same as the MESSAGE2 Register. MSB sent first.
Will be the same as the WDSTATUS Register. MSB sent first.
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Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet