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POST (hex)
0Fh
Reserved
Auto detect flash type to load appropriate flash R/W codes into the run time
10h
area in F000 for ESCD & DMI support.
11h
Reserved
Use walking 1's algorithm to check out interface in CMOS circuitry.
12h
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 Early_Init_Onboard_Generator switch.
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 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.
24h
Reserved
25h
Reserved
26h
Reserved
27h
Initialize INT 09 buffer
28h
Reserved
29h
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.
2Ah
Reserved
Description
37
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