Acer G520 Podręcznik Użytkownika Pobierz pdf (Strona 171)

161

POST Code Checkpoints

Each of the four LEDs can have one of four states: Off, Green, Red, or

Amber. The LED diagnostics feature consists of a hardware decoder

and four dual color LEDs. During POST, the LEDs will display all normal

Port80 codes representing the progress of the BIOS POST. Each

postcode will be represented by a combination of colors from the 4

LEDs. During the POST process, each light sequence represents a

specific Port-80 POST code. If a system should hang during POST, the

Diagnostic LEDs will present the last test executed before the hang.

When reading the lights, the LEDs should be observed from the back of

the system.

Check

point

Diagnostic LED Decoder

DescriptionG=Green, R=Red, A+Amber

MSB LSB

03 OFF OFF G G Disable NMI, parity, video

for EGA, and 03DMA

controllers. Initialize BIOS,

POST, Run-time data area.

Initialize BIOS modules on

POST entry and GPNV

area. Initialized CMOS as

mentioned in the Kernel

Variable “wCMOSFlags”

04 OFF G OFF OFF Check CMOS diagnostic

byte to determine if

battery power is OK and

CMOS checksum is OK.

Verify CMOS checksum

manually by reading

storage area. If the CMOS

checksum is bad, update

CMOS with power-on

default values and clear

passwords. Initialize status

Initializes data variables

that are based on CMOS

setup questions. Initializes

both the 8259 compatible

PICs in the system

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