User’s Manual
Custom Embedded Solutions
WIN Enterprises, Inc. [email protected] www-win-ent.com (978)688-2000
80
5. How to save bypass settings into CMOS data
Normally the LAN bypass function is set by BIOS settings. The user also can
change the LAN bypass settings by previous program. But the new settings will be
changed back to BIOS default when recycle the power supply or system reboot. If
you want the new settings also update to BIOS setup setting, please add below
sample code to the end of previous section program.
MOV DX, 72H
MOV AL, 29H
OUT DX, AL
MOV DX, 73H
MOV AL, #value#
OUT DX, AL
D=disable, E=enable
ON= power on bypass status
OFF= power off bypass status
For example:
Power off LAN Segment 1 bypass: Enable
Power on LAN Segment 1 bypass: Disable
Power off LAN Segment 2 bypass: Enable
Power on LAN Segment 2 bypass: Enable
Sample code:
MOV DX, 72H
MOV AL, 29H
OUT DX, AL
MOV DX, 73H
MOV AL, 0BH
Segment 1
OFF
D
E
E
E
E
E
E
D
D
Segment 1
ON
D
D
E
E
E
D
D
D
D
Segment 2
OFF
D
D
D
E
E
E
E
E
E
Segment 2
ON
D
D
D
D
E
E
D
D
E
Value
7Bh
6Bh
63H
23H
03H
0BH
2BH
3BH
1BH
