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GA-G1975X Motherboard - 104 -
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4-3 POST Error Code
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 1. Detect memory
-Auto-detection of DRAM size, type and ECC.
-Auto-detection of L2 cache (socket 7 or below)
2. PEG slots Auto-Configuration
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
03h Initial Superio_Early_Init switch.
05h 1. Blank out screen
2. Clear CMOS error flag
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.
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.
0Eh Test F000h segment shadow to see whether it is R/W-able or not. If
test fails, keep beeping the speaker.
10h Auto detect flash type to load appropriate flash R/W codes into the
run time area in F000 for ESCD & DMI support.
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.
14h Program chipset default values into chipset. Chipset default values are
MODBINable by OEM customers.
16h Initial Early_Init_Onboard_Generator switch.
18h Detect CPU information including brand, SMI type (Cyrix or Intel) and CPU
level (586 or 686).
1Bh Initial interrupts vector table. If no special specified, all H/W interrupts are
directed to SPURIOUS_INT_HDLR & S/W interrupts to
SPURIOUS_soft_HDLR.