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Chapter 4
12h
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.
13h
Reserved
14h
Program chipset default values into chipset. Chipset default val-
ues are MODBINable by OEM customers.
15h
Reserved
16h
Initial onboard clock generator if Early_Init_Onboard_Generator
is defined. See also POST 26h.
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 inter-
rupts 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 Smos checksum
fails, use default value instead.
24h
Prepare BIOS resource map for PCI & PnP use. If ESCD is
valid, take into consideration of the ESCD’s legacy information.
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 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.
Checkpoint
Description
Содержание AcerPower S260
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Страница 15: ...Chapter 1 7 Block Diagram ...
Страница 97: ...89 Chapter 6 Exploded Diagram ...