Intel SDS2 manual Timestamp Clock

BIOS						Intel® Server Board SDS2
	Name	Sensor #	Sensor Type	Type		Triggers
				Event/		Event
	Sensor			Reading		Offset
						Fault Status
	DIMM 6	6Dh	Slot Connector	Sensor		Asserted,
			- 21h	Specific - 6Fh		Device Installed,
						Disabled
						S0 / G0,
	System ACPI		System ACPI	Sensor		S1,
		78h	Power State –			S4,
	Power State			Specific - 6Fh
			22h			S5 / G2,
						G3 Mechanical Off
				Sensor		Power Button,
	Button	79h	Button – 14h			Sleep Button,
				Specific - 6Fh
						Reset Button
	System	7Ah	System Event –	Sensor		OEM System Boot
	Event		12h	Specific - 6Fh		Event (Hard Reset)
	SMI Timeout	7Bh	SMI Timeout –	Sensor		State Asserted
			F3h	Specific - 6Fh
						I2C device not found,
	Sensor	7Ch	Sensor Failure	Sensor		I2C device error
	Failure		– F6h	Specific - 6Fh		detected,
						I2C Bus Timeout
	NMI Signal	7Dh	OEM - C0h	Digital	-
	State			Discrete - 03h
	SMI Signal	7Eh	OEM - C0h	Digital	-
	State			Discrete - 03h

6.2.4.2Timestamp Clock

The BMC maintains a four-byte internal timestamp clock used by the System Event Log and Sensor Data Record subsystems. This clock is incremented once per second and is read and set using the Get SEL Time and Set SEL Time commands, respectively. The Get SDR Time command can also be used to read the timestamp clock.

The BMC has direct access the system real-time clock. This allows the BMC to automatically synchronize the SEL/SDR timestamp clock to the real-time clock time on BMC startup. The BMC periodically reads the real-time clock to maintain synchronization even when software asynchronously changes the value. In addition to this, the BIOS send a timestamp to the BMC using Set SEL Time command during POST.

44	Revision 1.2
Order Number:	A85874-002