Troubleshooting Post - Aaeon Raptor MicroATX Installation Manual

Raptor MicroATX – Installation Guide

Troubleshooting POST

Embedded BIOS writes progress codes, also known as POST codes, to
I/O port 80h during POST, in order to provide information to OEM
developers about system faults. These POST codes may be monitored
by a port 80h card in a PCI slot; they are not displayed on the screen.
Table B-1 Embedded BIOS 2000 POST Codes
Mnemonic Code
POST_STATUS_START
POST_STATUS_CPUTEST
POST_STATUS_DELAY
POST_STATUS_
DELAYDONE
POST_STATUS_
KBDBATRDY
POST_STATUS_
DISABSHADOW
POST_STATUS_
CALCCKSUM
POST_STATUS_
CKSUMGOOD
POST_STATUS_BATVRFY
POST_STATUS_KBDCMD
POST_STATUS_KBDDATA
POST_STATUS_
BLKUNBLK
POST_STATUS_KBDNOP
POST_STATUS_SHUTTEST
POST_STATUS_
CMOSDIAG
POST_STATUS_CMOSINIT
POST_STATUS_
CMOSSTATUS
POST_STATUS_
DISABDMAINT
POST_STATUS_
DISABPORTB
46
Code System Progress Report
00h Start POST (BIOS is
executing).
01h Start CPU register test.
02h Start power-on delay.
03h Power-on delay finished.
04h Keyboard BAT finished.
05h Disable shadowing & cache.
06h Compute ROM CRC, wait
for KBC.
07h CRC okay, KBC ready.
08h Verifying BAT command to
KB.
09h Start KBC command.
0ah Start KBC data.
0bh Start pin 23,24 blocking &
unblocking.
0ch Start KBC NOP command.
0dh Test CMOS RAM shutdown
register.
0eh Check CMOS checksum.
0fh Initialize CMOS contents.
10h Initialize CMOS status for
date/time.
11h Disable DMA, PICs.
12h Disable Port B, video
display.