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POST (hex)
1Bh:
1Dh
1Fh:
21h:
23h:
24h:
25h:
26h:
27h:
29h:
2Bh:
2Dh:
33h:
35h:
37h:
39h:
3Ch:
3Eh:
40h:
43h:
Description
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.
Initial EARLY_PM_INIT switch.
Load keyboard matrix (notebook platform)
HPM initialization (notebook platform)
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.
Prepare BIOS resource map for PCI & PnP use. If ESCD
is valid, take into consideration of the ESCD' s legacy
information.
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
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
Initialize INT 09 buffer
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.
Invoke Video BIOS
1. Initialize double-byte language font (Optional)
2. Put information on screen display, including Award title,
CPU type, CPU speed, full screen logo.
Reset keyboard if Early_Reset_KB is defined e.g. Winbond
977 series Super I/O chips. See also POST 63h.
Test DMA Channel 0.
Test DMA Channel 1.
Test DMA page registers.
Test 8254
Test 8259 interrupt mask bits for channel 1.
Test 8259 interrupt mask bits for channel 2.
Test 8259 functionality.
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