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Appendix
C-2
18h Detect CPU information including brand, SMI type (Cyrix or Intel) and
CPU level (586 or 686).
19-1Ah 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.
24-26h 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.
2A-2Ch Reserved
2Dh 1. Initialize multi-language
2. Put information on screen display, including Award title, CPU type,
CPU speed ….
2E-32h Reserved
33h Reset keyboard except Winbond 977 series Super I/O chips.
34-3Bh Reserved
3Ch Test 8254
3Dh Reserved
3Eh Test 8259 interrupt mask bits for channel 1.
3Fh Reserved
40h Test 8259 interrupt mask bits for channel 2.
41h Reserved
42h Reserved