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Appendix B: AwardBIOS POST Codes
B-1
This section lists the POST (Power On Self Testing) Codes for the Award BIOS.
POST (hex) Description
CFh Test CMOS R/W functionality.
C0h Early chipset initialization:
-Disable shadow RAM
-Disable L2 cache (socket 7 or below)
-Program basic chipset registers
C1h Detect memory
-Auto-detection of DRAM size, type and ECC.
-Auto-detection of L2 cache (socket 7 or below)
C3h Expand compressed BIOS code to DRAM
C5h Call chipset hook to copy BIOS back to E000 & F000 shadow
RAM.
0h1 Expand the Xgroup codes locating in physical address 1000:0
02h Reserved
03h Initial Superio_Early_Init switch.
04h Reserved
05h 1. Blank out screen
2. Clear CMOS error flag
06h Reserved
07h 1. Clear 8042 interface
2. Initialize 8042 self-test
08h 1. Test special keyboard controller for Winbond 977 series Super
I/O chips.
2. Enable keyboard interface.
09h Reserved
0Ah
l
Disable PS/2 mouse interface (optional).
l
Auto detect ports for keyboard & mouse followed by a port & interface swap
(optional).
l
Reset keyboard for Winbond 977 series Super I/O chips.
0Bh Reserved
0Ch Reserved
0Dh Reserved
0Eh Test F000h segment shadow to see whether it is R/W-able or not. If
test fails, keep beeping the speaker.
C1h
05h
07h
0Eh
14h
26h
2Bh
52h
001b
010b
011b
101b
110b
111b
000b
Memory Detection
BIOS Shadowing
KBC Initialization
Shadow RAM test
Chipset defaults loaded
Clock generator configured
Video initialization
Just clear LEDs
Post CodePost Code
Post CodePost Code
Post Code
Encoded LEDEncoded LED
Encoded LEDEncoded LED
Encoded LED
TaskTask
TaskTask
Task
100b
Debuggig LED Encoding
Appendix B
AwardBIOS POST Codes