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Checkpoint
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
1Bh
1Ch
1Dh
1Eh
1Fh
20h
21h
22h
23h
24h
25h
26h
27h
28h
29h
58
Use walking 1's algorithm to check out interface in CMOS cir-
cuitry. Also set real-time clock power status, and then check for
override.
Reserved
Program chipset default values into chipset. Chipset default val-
ues are MODBINable by OEM customers.
Reserved
Initial onboard clock generator if Early_Init_Onboard_Generator
is defined. See also POST 26h.
Reserved
Detect CPU information including brand, SMI type (Cyrix or
Intel) and CPU level (586 or 686).
Reserved
Reserved
Initial interrupts vector table. If no special specified, all H/W
interrupts are directed to SPURIOUS_INT_HDLR & S/W inter-
rupts to SPURIOUS_soft_HDLR.
Reserved
Initial EARLY_PM_INIT switch
Reserved
Load keyboard matrix (notebook platform)
Reserved
HPM Initialization (notebook platform)
Reserved
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 checksum
fails, use default value instead.
Prepare BIOS resource map for PCI & PnP use. If ESCD is
valid, take into consideration of the ESCD's legacy information.
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
1. If Early_Init_Onboard_Generator is not defined Onboard
clock generator initialization. Disable respective clock
resource to empty PCI & DIMM slots.
2. Init onboard PWM
3. Init onboard H/W monitor devices
Initialize INT 09 buffer
Reserved
1. Program CPU internal MTRR (P6 & PII) for 0-640K mem-
ory 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.
Description
Chapter 4
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