34 Service Guide
12.2
Post Indications
POST LED (The left is Hi bit.(MSB))
Figure 12.1
Table 12.1 Boot Block POST Progress Codes
Diagnostic LED
Decoder
G=Green, R=Red,
A=Amber
Hi
Low
Description
10h
Off
Off
Off
R
The NMI is disabled. Start Power-on delay. Initialization code checksum verified.
11h Off Off Off A
Initialize the DMA controller, perform the keyboard controller BAT test, start
memory refresh, and enter 4 GB flat mode.
12h
Off
Off
G
R
Get start of initialization code and check BIOS header.
13h Off
Off G A Memory
sizing.
14h Off G Off R
Test base 512K of memory. Return to real mode. Execute any OEM patches and
set up the stack.
15h Off G Off A
Pass control to the uncompressed code in shadow RAM. The initialization code
is copied to segment 0 and control will be transferred to segment 0.
16h Off G G R
Control is in segment 0. Verify the system BIOS checksum.
If the system BIOS checksum is bad, go to checkpoint code E0h.
Otherwise, going to checkpoint code D7h.
17h
Off
G
G
A
Pass control to the interface module.
18h
G
Off
Off
R
Decompress of the main system BIOS failed.
19h
G
Off
Off
A
Build the BIOS stack. Disable USB controller. Disable cache.
1Ah
G
Off
G
R
Uncompress the POST code module. Pass control to the POST code module.
1Bh
A
R
Off
R
Decompress the main system BIOS runtime code.
1Ch
A
R
Off
A
Pass control to the main system BIOS in shadow RAM.
E0h R R R Off
Start of recovery BIOS. Initialize interrupt vectors, system timer, DMA controller,
and interrupt controller.
E8h
A
R
R
Off
Initialize extra module if present.
E9h
A
R
R
G
Initialize floppy controller.
EAh
A
R
A
Off
Try to boot floppy diskette.
EBh
A
R
A
G
If floppy boot fails, intialize ATAPI hardware.
ECh
A
A
R
Off
Try booting from ATAPI CD-ROM drive.
EEh
A
A
A
Off
Jump to boot sector.
EFh A A A G
Disable
ATAPI
hardware.
Summary of Contents for EXPRESS5800/120Rd-1
Page 1: ... EXPRESS5800 120Rd 1 S e r v i c e G u i d e ...
Page 3: ...Revision Record Edition COMP Date Page Description 1 0 2003 1 16 First Edition ...
Page 4: ...II Service Guide ...
Page 18: ...XVI Service Guide ...
Page 52: ...32 Service Guide 12 Appendix 12 1 Block Diagram System Block Diagram ...
Page 53: ...33 Service Guide Power Block Diagram ...
Page 67: ...47 Service Guide Figure 12 10 CRS Cable xx ...
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