Abit IT7-MAX2, User Manual

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2-12 Chapter 2
23
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 into C000:0
27 Initialize INT 09 buffer
29
1. Program CPU internal MTRR (P6 & PII) 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
2D
1. Initialize multi-language
2. Put information on screen display, including Award title, CPU type, CPU speed …
33 Reset keyboard except Winbond 977 series Super I/O chips
3C Test 8254
3E Test 8259 interrupt mask bits for channel 1
40 Test 8259 interrupt mask bits for channel 2
43 Test 8259 functionality
47 Initialize EISA slot
49
1. Calculate total memory by testing the last double word of each 64K page
2. Program writes allocation for AMD K5 CPU
4E
1. Program MTRR of M1 CPU
2. Initialize L2 cache for P6 class CPU & program CPU with proper cacheable range
3. Initialize the APIC for P6 class CPU
4. On MP platform, adjust the cacheable range to smaller one in case the cacheable ranges
between each CPU are not identical
50 Initialize USB
52 Test all memory (clear all extended memory to 0)
55 Display number of processors (multi-processor platform)
57
Display PnP logo
Early ISA PnP initialization
-Assign CSN to every ISA PnP device
59 Initialize the combined Trend Anti-Virus code
5B (Optional Feature) Show message for entering AWDFLASH.EXE from FDD (optional)
5D
1. Initialize Init_Onboard_Super_IO switch
2. Initialize Init_Onbaord_AUDIO switch
60
Okay to enter Setup utility; i.e. not until this POST stage can users enter the CMOS setup
utility
65 Initialize PS/2 Mouse
67 Prepare memory size information for function call: INT 15h ax=E820h
69 Turn on L2 cache
IT7-MAX2