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POST Codes and Countdown Codes
BIOS indicates the current testing phase during POST after the video adapter has been successfully initialized by outputting a
Table 16. Port-80 Codes
POST Code
02
03
04
06
08
09
0A
0B
0C
0E
0F
10
11
12
13
14
16
17
18
1A
1C
20
22
24
28
29
2A
2C
2E
2F
30
32
33
34
Beeps
Error
Verify Real Mode
Disable NMI
Get Processor type
Initialize system hardware
Initialize chip set registers with initial POST values
Set in POST flag
Initialize processor registers
Enable processor cache
Initialize caches to initial POST values
Initialize I/O
Initialize the local bus IDE
Initialize Power Management
Load alternate registers with initial POST values new
Restore processor control word during warm boot
Reset PCI bus masters
Initialize keyboard controller
BIOS ROM checksum
Prepare to size RAM
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
Autosize DRAM
Initialize or call 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
Prepare to shadow system BIOS
RAM failure on data bits xxxx of high byte of memory bus
Test processor
Initialize the POST Dispatch Manager
Test CMOS
continued
SRPL8 Server System Product Guide | 163 |