User`s manual

42
POST (hex) Description
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 sta
ck. 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
2Bh Reserved
2Ch Reserved
2Dh 1. Initialize multi-language
2.
Put information on screen display, including Award title,
CPU type, CPU speed ….
2Eh Reserved
2Fh Reserved
30h Reserved
31h Reserved