BIOS SPECIFICATION
6-7
4. BIOS Features
4.1 SYSTEM SECURITY
The functions of all passwords are listed in following table.
Table 4-1 Password Function
Password Function User Supervisor Hard Disk
Access all setup items V
Access only part of se tup items V
Enter system V
Unlock a hard disk V
Disable “lock” of a hard disk V
Here are some other rules should be followed:
If supervisor password is enabled, BIOS allows supervisor setting the authority level of the user
password.
The authority levels of user password are listed below.
[No Access] : User can not access setup menu.
[View Only]/[Limited] : User can view setup menu but can not change it.
[Full Access] : User can fully access setup menu.
4.2 SYSTEM MEMORY
The system BIOS automaticall y detects the amount of memory in the system and configure the DRAM
timing based on the SPD data of DIMM module and the CMOS settings during the POST
(Power-On-Self-Test) process. The memory detection only supports DDR2 (Double Data Rate 2)
SDRAM.
The DRAM clock is routed as follows:
DIMM 1 uses SCK0/SCK0#, SCK1/SCK1#, SCK2/SCK2#, CS0/CS1, CKE0/CKE1.
DIMM 2 uses SCK3/SCK3#, SCK4/SCK4#, SCK5/SCK5#, CS2/CS3, CKE2/CKE3.
4.3 LCD BRIGHTNESS CONTROL
During POST, the LCD brightness will be set by BIOS based on the LEVEL INDEX saved in a
designated extended CMOS byte. If the CMOS’ checksum is incorrect or the CMOS is loaded with setup
default setting, the LEVEL INDEX will be set to 0Fh in the designated CMOS byte for LCD brightness
level. Whenever the fu nction hot ke y Fn+F5 or Fn+F 6 is pressed, the brightn ess level setting s hould b e
updated to the designated CMOS byte as well as setting the new brightness level.
In S62F, there are 16 levels for brightness control. The setting values of these 16 levels are different
between AC-powering and DC-powering modes. Table 4.3 shows the brightness level for each stage
used by BIOS.
Table 4.3 LCD BRIGHTNESS LEVEL TABLE
LCD BRIGHTNESS LEVEL
LEVEL
INDEX 00h 01h 02h 03h 04h 05h 06h 07h 08h 09h 0Ah 0Bh 0Ch 0Dh 0Eh 0Fh
AC 15h 24h 33h 42h 51h 60h 6Fh 7Fh 8Fh 9Fh AFh BFh CFh DFh EFh FFh
DC 0Fh 1Eh 2Dh 3Ch 4Bh 5Ah 69h 78h 87h 96h A5h B4h C3h D2h E1h F0h