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64 Chapter 4
11h Reserved
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.
13h Reserved
14h Program chipset default values into chipset. Chipset
default values are MODBINable by OEM customers.
15h Reserved
16h Initial onboard clock generator if
Early_Init_Onboard_Generator is defined. See also POST
26h.
17h Reserved
18h Detect CPU information including brand, SMI type (Cyrix or
Intel) and CPU level (586 or 686).
19h Reserved
1Ah Reserved
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.
1Ch Reserved
1Dh Initial EARLY_PM_INIT switch
1Eh Reserved
1Fh Load keyboard matrix (notebook platform)
20h Reserved
21h HPM Initialization (notebook platform)
22h Reserved
23h 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 Smos check-
sum fails, use default value instead.
24h Prepare BIOS resource map for PCI & PnP use. If ESCD
is valid, take into consideration of the ESCD’s legacy infor-
mation.
25h 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
26h 1. If Early_Init_Onboard_Generator is not defined
Onboard clock generator initialization. Disable respec-
tive clock resource to empty PCI & DIMM slots.
2. Init onboard PWM
3. Init onboard H/W monitor devices
27h Initialize INT 09 buffer
28h Reserved
Checkpoint Description