Post Task Routines - Acer Aspire 1800 Service Manual

POST Task Routines

The following is a list of the Test Point codes written to port 80h at the start of each routine, the beep codes
issued for terminal errors, and a description of the POST routine. Unless otherwise noted, these codes are
valid for PhoenixBIOS.
NOTE: The following routines are sorted by their test point numbers assigned in the BIOS code. Their actual
oder as executed during POST can be quite different.
Code
02h
03h
04h
06h
08h
09h
0Ah
0Bh
0Ch
0Eh
0Fh
10h
11h
12h
13h
14h
16h 1-2-2-3
17h
18h
1Ah
1Ch
20h 1-3-1-1
22h 1-3-1-3
24h
26h
28h
29h
2Ah
2Ch 1-3-4-1
2Eh 1-3-4-3
2Fh
30h 1-4-1-1
32h
33h
36h
38h
3Ah
Chapter 4
Beeps
Verify Real Mode
Disable Non-Maskable Interrupt (NMI)
Get CPU type
Initialize system hardware
Initialize chipset with initial POST values
Set IN POST flag
Initialize CPU registers
Enable CPU cache
Initialize caches to initial POST values
Initialize I/O component
Initialize the local bus IDE
Initialize Power Management
Load alternate registers with initial POST values
Restore CPU control word during warm boot
Initialize PCI Bus Mastering devices
Initialize keyboard controller
BIOS ROM checksum
Initialize cache before memory autosize
8254 timer initialization
8237 DMA controller initialization
Reset Programmable Interrupt Controller
Test DRAM refresh
Test 8742 Keyboard Controller
Set ES segment register to 4 GB
Enable A20 line
Autosize DRAM
Initialize POST Memory Manager
Clear 512 KB base RAM
RAM failure on address line xxxx*
RAM failure on data bits xxxx* of low byte of memory bus
Enable cache before system BIOS shadow
RAM failure on data bits xxxx* of high byte of memory bus
Test CPU bus-clock frequency
Initialize Phoenix Dispatch Manager
Warm start shut down
Shadow system BIOS ROM
Autosize cache
POST Routine Description
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