Trinity KT400 S2495
Appendix II: Post Error Code for BIOS
5-7
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Appendix II: Post Error Code for 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.
01h:
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:
1. Disable PS/2 mouse interface (optional).
2. Autodetect ports for keyboard & mouse followed by a port & interface
swap (optional).
3. 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.
