Intel N2820 FH8065301616603 Data Sheet

Datasheet

1043

Default: 00040000h

§ §

31:22

0b

RO

reserved: Reserved.

21:20

0b

RW

OS_POLICY (os_policy): OS-based software writes to these bits to select the policy 

that the BIOS will use after the platform resets due the WDT. The following convention is 

recommended for the BIOS and OS: 00 Boot normally 01 Shut down 10 Dont load OS. 

Hold in pre-boot state and use LAN to determine next step 11 Reserved

19:13

0b

RO

reserved (reserved2): Reserved.

12

0b

RW

TCO Lock (TCO_LOCK) (tco_lock): When set to 1, this bit prevents writes from 

changing the TCO_EN bit (in offset 30h of Power Management I/O space). Once this bit 

is set to 1, it can not be cleared by software writing a 0 to this bit location. A core-well 

reset is required to change this bit from 1 to 0. This bit defaults to 0.

11

0b

RW

TCO Timer Halt (TCO_TMR_HALT) (tco_tmr_halt): 1 = The TCO timer will halt. It 

will not count, and thus cannot reach a value that would cause an SMI# or to cause the 

SECOND_TO_STS bit to be set. This will also prevent rebooting. 0 = The TCO timer is 

enabled to count. This is the default.

10:0

0b

RO

reserved1: Reserved.

Type: I/O Register

(Size: 32 bits)

ACPI_BASE_ADDRESS Type: PCI Configuration Register (Size: 

32 bits)
ACPI_BASE_ADDRESS Reference: [B:0, D:31, F:0] + 40h

31

28

24

20

16

12

8

4

0

0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

re

se

rv

ed

1

tc

o

_

tr

ld

_

va

l

re

se

rv

ed

31:26

0b

RO

reserved (reserved1): Reserved.

25:16

004h

RW

TCO Timer reload value (TCO_TRLD_VAL) (tco_trld_val): Value that is loaded into 

the timer each time the TCO_RLD register is written. Values of 0000h or 0001h will be 

ignored and should not be attempted. The timer is clocked at approximately 0.6 

seconds, and thus allows timeouts ranging from 1.2 second to 613.8 seconds. Note: The 

timer has an error of +/- 1 tick (0.6s). The TCO Timer will only count down in the S0 

state.

15:0

0b

RO

reserved: Reserved.