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Intel Desktop Board DX79TO Product Guide
72
Table 18 lists the Port 80h POST codes in hexadecimal notation.
Table 18. Port 80h POST Codes
POST Code Description
ACPI S States
00 Entering S0 state, standard
01-05 Entering S1-S5 state
10, 20, 30,
40, 50
Resuming from S1-S5 state
Security Phase (SEC)
08 Starting BIOS execution after CPU BIST
09 SPI prefetching and caching
0A, 0B Load BSP/APS microcode
0C Platform program base addresses
0D Wake up all APS
0E Initialize NEM
0F Pass entry point of the PEI core
PEI Phase Before MRC
11 Set bootmode, GPIO init
12 Early chipset register programming
13 Basic PCH init, discrete device init
14 LAN init
15 Exit early platform init driver
16 SMBUS driver init
17, 18 Entry/Exit to SMBUS execute read/write
19, 1A Entry/Exit to CK505 programming
1B, 1C Entry/Exit to PEI overclock programming
MEC Memory Detection
21 MRC entry point
23 Reading SPD from memory DIMMs
24 Detecting presence of memory DIMMs
27 Configuring memory
28 Testing memory
29 Exit MRC driver
PEI After MRC
2A, 2B Start/finish programming MTRR settings
continued