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Diagnostic LED
Decoder
G=Green, R=Red,
A=Amber
Hi
12h
Off
Off
G
13h
Off
Off
G
14h
Off
G
Off
15h
Off
G
Off
16h
Off
G
G
17h
Off
G
G
18h
G
Off
Off
19h
G
Off
Off
1Ah
G
Off
G
1Bh
A
R
Off
1Ch
A
R
Off
E0h
R
R
R
E8h
A
R
R
E9h
A
R
R
Eah
A
R
A
Ebh
A
R
A
Ech
A
A
R
Eeh
A
A
A
Efh
A
A
A
Diagnostic LED
Decoder
G=Green, R=Red,
A=Amber
Hi
20h
Off
Off
R
22h
Off
Off
A
24h
Off
G
R
26h
Off
G
A
28h
G
Off
R
2Ah
G
Off
A
2Ch
G
G
R
70
Low
R
Get start of initialization code and check BIOS header.
A
Memory sizing.
Test base 512K of memory. Return to real mode. Execute any OEM patches
R
and set up the stack.
Pass control to the uncompressed code in shadow RAM. The initialization code
A
is copied to segment 0 and control will be transferred to segment 0.
Control is in segment 0. Verify the system BIOS checksum.
R
If the system BIOS checksum is bad, go to checkpoint code E0h.
Otherwise, going to checkpoint code D7h.
A
Pass control to the interface module.
R
Decompress of the main system BIOS failed.
A
Build the BIOS stack. Disable USB controller. Disable cache.
R
Uncompress the POST code module. Pass control to the POST code module.
R
Decompress the main system BIOS runtime code.
A
Pass control to the main system BIOS in shadow RAM.
Start of recovery BIOS. Initialize interrupt vectors, system timer, DMA controller,
Off
and interrupt controller.
Off
Initialize extra module if present.
G
Initialize floppy controller.
Off
Try to boot floppy diskette.
G
If floppy boot fails, intialize ATAPI hardware.
Off
Try booting from ATAPI CD-ROM drive.
Off
Jump to boot sector.
G
Disable ATAPI hardware.
Table 79. POST Progress Codes
Description
Low
Off
Uncompress various BIOS Modules
Off
Verify password Checksum
Off
Verify CMOS Checksum.
Off
Read Microcode updates from BIOS ROM.
Initializing the processors. Set up processor registers. Select least featured
Off
processor as the BSP.
Off
Go to Big Real Mode
Off
Decompress INT13 module
SE7221BK1-E Technical Product Specification
Description
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