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NEX 6620A User's Guide
Rev. B0 0301
BIOS Setup
4-33
4-3 BIOS Reference - POST Codes
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
1. Disable PS/2 mouse interface (optional).
2. Auto detect 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.
0Fh Reserved
10h
Auto detect flash type to load appropriate flash R/W codes into the run time area in F000