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
Disable PS/2 mouse interface (optional).
Auto detect ports for keyboard & mouse followed by a port & interface swap
(optional).
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
Code
Encoded LED
Task
100b
Debuggig LED Encoding
Appendix B
AwardBIOS POST Codes
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