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ESM-2740/2743
88 ESM-2740/2743 User’s Manual
40. 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.
A
uto 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 for ESCD & DMI support.
11h Reserved
12h
Use walking 1’s 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.