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Appendix
D-1
Appendix D
D-1 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.
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. Auto detect ports for keyboard & mouse followed by a port &
interface swap (optional).
3. Reset keyboard for Winbond 977 series Super I/O chips.
0B-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 for ESCD & DMI support.
11h Reserved
12h Use walking 1s algorithm to check out interface in CMOS circuitry.
Also set real-time clock power status, and then check for override.
13h Reserved
14h Program chipset default values into chipset. Chipset default values are
MODBINable by OEM customers.
15h Reserved
16h Initial Early_Init_Onboard_Generator switch.
17h Reserved