Check

Diagnostic LED decoder

Description

point

G=Green, R=Red, O=Orange

 

 

 

 

 

 

 

0E

G

G

G

Off

Testing and initialization of different Input Devices. Also, update

 

 

 

 

 

the Kernel Variables.

 

 

 

 

 

Trap the INT09h vector, so that the POST INT09h handler gets

 

 

 

 

 

control for IRQ1. Uncompress all available language, BIOS logo,

 

 

 

 

 

and Silent logo modules.

 

 

 

 

 

 

13

Off

Off

G

O

Early POST initialization of chipset registers.

 

 

 

 

 

 

24

Off

G

R

Off

Uncompress and initialize any platform specific BIOS modules.

 

 

 

 

 

 

30

Off

Off

R

R

Initialize System Management Interrupt.

 

 

 

 

 

 

2A

G

Off

O

Off

Initialize different devices through DIM.

 

 

 

 

 

See “DIM code checkpoints” on page 134 for more information.

 

 

 

 

 

 

2C

G

G

R

Off

Initialize different devices. Detects and initializes the video

 

 

 

 

 

adapter installed in the system that has optional ROMs.

 

 

 

 

 

 

2E

G

G

O

Off

Initialize all the output devices.

 

 

 

 

 

 

31

Off

Off

R

O

Allocate memory for ADM module and uncompress it. Give

 

 

 

 

 

control to ADM module for initialization. Initialize language and

 

 

 

 

 

font modules for ADM. Activate ADM module.

 

 

 

 

 

 

33

Off

Off

O

O

Initialize the silent boot module. Set the window for displaying

 

 

 

 

 

text information.

 

 

 

 

 

 

37

Off

G

O

O

Displaying sign-on message, CPU information, setup key

 

 

 

 

 

message, and any OEM-specific information.

 

 

 

 

 

 

38

G

Off

R

R

Initialize different devices through DIM. See “DIM code

 

 

 

 

 

checkpoints” on page 134 for more information.

 

 

 

 

 

 

39

G

Off

R

O

Initialize DMAC-1 and DMAC-2.

 

 

 

 

 

 

3A

G

Off

O

R

Initialize RTC date/time.

 

 

 

 

 

 

3B

G

Off

O

O

Test for total memory installed in the system. Also, check for DEL

 

 

 

 

 

or ESC keys to limit memory test. Display total memory in the

 

 

 

 

 

system.

 

 

 

 

 

 

3C

G

G

R

R

Mid-POST initialization of chipset registers.

 

 

 

 

 

 

40

Off

R

Off

Off

Detect different devices (parallel ports, serial ports, and

 

 

 

 

 

coprocessor in CPU, and so on) successfully installed in the

 

 

 

 

 

system and update the BDA, EBDA, and so on.

 

 

 

 

 

 

50

Off

R

Off

R

Programming the memory hole or any kind of implementation

 

 

 

 

 

that needs an adjustment in system RAM size, if needed.

 

 

 

 

 

 

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