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 respective 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
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.
2 Ah
Reserved
2Bh
Invoke Video BIOS
2Ch
Reserved
2Dh
1. Initialize double-byte language font (Optional)
2. Put information on screen display, including Award title,
CPU type, CPU speed, full screen logo.
2Eh
Reserved
2Fh
Reserved
30h
Reserved
31h
Reserved
32h
Reserved
33h
Reset keyboard if Early_Reset_KB is defined e.g. Winbond 977
series Super I/O chips. See also POST 63h.
34h
Reserved
35h
Test DMA Channel 0
36h
Reserved
37h
Test DMA Channel 1.
38h
Reserved
39h
Test DMA page registers.
3 Ah
Reserved
3Bh
Reserved
3312400 User's Manual
45
