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6
Reserved
7
Test CMOS Interface and
Battery Status
Chipset Default
BE
Initialization
C1
Memory presence test
C5
Early Shadow
C6
Cache presence test
8
Setup low memory
9
Early Cache
Initialization
A
Setup Interrupt Vector
Table
B
Test CMOS RAM
Checksum
C
Initialize keyboard
D
Initialize Video Interface
E
Test Video Memory
F
Test DMA Controller 0
10
Test DMA Controller 1
Test DMA Page Registers Test DMA Page Registers.
11
12-13
Reserved
14
Test Timer Counter 2
15
Test 8259-1 Mask Bits
16
Test 8259-2 Mask Bits
17
Test Stuck 8259's
Interrupt Bits
Verifies CMOS is working correctly, detects bad battery.
Program chipset registers with power on BIOS defaults.
OEM Specific-Test to size on-board memory.
OEM Specific-Early Shadow enable for fast boot.
External cache size detection.
Early chip set initialization.
Memory presence test.
OEM chip set routines.
Clear low 64K of memory.
Test first 64K memory.
Cyrix CPU initialization.
Cache initialization.
Initialization first 120 interrupt vectors with
SPURIOUS_INT_HDLR and initialize INT 00h-1Fh
according to INT_TBL
Test CMOS RAM Checksum, if bad, or insert key
pressed, load defaults.
Detect type of keyboard controller (optional) Set
NUM_LOCK status.
Detect CPU clock.
Read CMOS location 14h to find out type of video in use.
Detect and Initialize Video Adapter.
Test video memory, write sign-on message to screen.
Setup shadow RAM.Enable shadow according to Setup.
BIOS checksum test.
Keyboard detect and initialization.
Test 8254 Timer 0 Counter 2.
Verify 8259 Channel 1 masked interrupts by alternately
turning off and on the interrupt lines.
Verify 8259 Channel 2 masked interrupts by alternately
turning off and on the interrupt lines.
Turn off interrupts then verify no interrupt mask register
is on.
39
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