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ASUS Crosshair A-1
A.1 Debug Code Table
Code Description
CPU INIT CPU Initiation
DET CPU Test CMOS R/W functionality.
CHIPINIT
Early chipset initialization:
-Disable shadow RAM
-Disable L2 cache (socket 7 or below)
-Program basic chipset registers
DET DRAM
Detect memory
-Auto-detection of DRAM size, type and ECC.
-Auto-detection of L2 cache (socket 7 or below)
DC FCODE Expand compressed BIOS code to DRAM
EFSHADOW Call chipset hook to copy BIOS back to E000 & F000 shadow RAM.
DC XCODE Expand the Xgroup codes locating in physical address 1000:0
INIT IO Initial Superio_Early_Init switch.
CLR SCRN
1. Blank out screen
2. Clear CMOS error ag
INIT8042
1. Clear 8042 interface
2. Initialize 8042 self-test
ENABLEKB
1. Test special keyboard controller for Winbond 977 series Super I/O chips.
2. Enable keyboard interface.
DIS MS
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.
R/W FSEG
Test F000h segment shadow to see whether it is R/W-able or not. If test
fails, keep beeping the speaker.
DET FLASH
Auto detect ash type to load appropriate ash R/W codes into the run time
area in F000 for ESCD & DMI support.
TESTCMOS
Use walking 1’s algorithm to check out interface in CMOS circuitry. Also set
real-time clock power status, and then check for override.
PRG CHIP
Program chipset default values into chipset. Chipset default values are
MODBINable by OEM customers.
INIT CLK Initial Early_Init_Onboard_Generator switch.
CHECKCPU
Detect CPU information including brand, SMI type (Cyrix or Intel) and CPU
level (586 or 686).
INTRINIT
Initial interrupts vector table. If no special specied, all H/W
interrupts are directed to SPURIOUS_INT_HDLR & S/W interrupts to
SPURIOUS_soft_HDLR.
REC MPS Initial EARLY_PM_INIT switch.
Reserved Load keyboard matrix (notebook platform)
Reserved HPM initialization (notebook platform)
SET FDD
1. Check validity of RTC value:
e.g. a value of 5Ah is an invalid value for RTC minute.
2. Load CMOS settings into BIOS stack. If CMOS checksum fails, use
default value instead.
3. Prepare BIOS resource map for PCI & PnP use. If ESCD is valid, take
into consideration of the ESCD’s legacy information.
4. Onboard clock generator initialization. Disable respective clock resource
to empty PCI & DIMM slots.
5. Early PCI initialization:
-Enumerate PCI bus number
-Assign memory & I/O resource
-Search for a valid VGA device & VGA BIOS, and put it nto C000:0.
INITINT9 Initialize INT 09 buffer