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2-18 Chapter 2
0A
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
0E
Test F000h segment shadow to see whether it is R/W-able or not. If test fails, keep
beeping the speaker
10
Auto detect flash type to load appropriate flash R/W codes into the run time area in F000
for ESCD & DMI support
12
Use walking 1’s algorithm to check out interface in CMOS circuitry. Also set real-time
clock power status, and then check for override
14
Program chipset default values into chipset. Chipset default values are MODBINable by
OEM customers
16 Initial Early_Init_Onboard_Generator switch
18
Detect CPU information including brand, SMI type (Cyrix or Intel) and CPU level (586
or 686)
1B
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
1D Initial EARLY_PM_INIT switch
1F Load keyboard matrix (notebook platform)
21 HPM initialization (notebook platform)
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
SI7 Series