Asus Maximus Extreme - Manual (Page 194)

A-4 Appendix: CPU features
Code Description
CPU INIT CPU Initiation
DET CPU Test CMOS R/W functionality.
CHIPINIT
Early chipset initialization:
-Disable shadow RAM
-Disable L2 cache
-Program basic chipset registers
DET DRAM
Detect memory
-Auto-detection of DRAM size, type and ECC.
-Auto-detection of L2 cache
DC FCODE Expand compressed BIOS code to DRAM
EFSHADOW Call chipset hook to copy BIOS back to E000 & F000 shadow RAM.
INIT IO Initialize IO devices.
INIT HWM Initialize Hardware Monitor.
CLR SCRN
1. Blank out screen
2. Clear CMOS error flag
INIT8042
1. Clear 8042 interface
2. Initialize 8042 self-test
ENABLEKB
1. Test special keyboard controller for 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 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 flash type to load appropriate flash 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.
INIT CLK Initialize clock generator.
CHECKCPU
Detect CPU information including brand, type and CPU level (586 or
686).
INTRINIT Initial interrupts vector table.
INITINT9 Initialize INT 09 buffer
CPUSPEED
1. Program CPU internal MTRR (Pentium class CPU) for 0-640K
memory address.
2. Initialize the APIC for Pentium class CPU.
3. Program early chipset according to CMOS setup. Example: onboard
IDE controller.
4. Measure CPU speed.
5. Invoke video BIOS.
VGA BIOS Initialize VGA BIOS
TESTVRAM
1. Initialize multi-language
2. Put information on screen display, including BIOS logo, CPU type,
CPU speed .
RESET KB Reset keyboard.
A.4 Debug code table