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Intel DH55TC User Manual

Intel DH55TC
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Error Messages and Beep Codes
69
4.5 Port 80h POST Codes
During the POST, the BIOS generates diagnostic progress codes (POST codes) to I/O
port 80h. If the POST fails, execution stops and the last POST code generated is left
at port 80h. This code is useful for determining the point where an error occurred.
Displaying the POST codes requires a PCI bus add-in card, often called a POST card.
The POST card can decode the port and display the contents on a medium such as a
seven-segment display.
NOTE
The POST card must be installed in the PCI bus connector.
The following tables provide information about the POST codes generated by the
BIOS:
Table 40 lists the Port 80h POST code ranges
Table 41 lists the Port 80h POST codes themselves
Table 42 lists the Port 80h POST sequence
NOTE
In the tables listed above, all POST codes and range values are listed in hexadecimal.
Table 40. Port 80h POST Code Ranges
Range Category/Subsystem
00 – 0F Debug codes: Can be used by any PEIM/driver for debug.
10 – 1F Host Processors: 1F is an unrecoverable CPU error.
20 – 2F Memory/Chipset: 2F is no memory detected or no useful memory detected.
30 – 3F Recovery: 3F indicated recovery failure.
40 – 4F Reserved for future use.
50 – 5F I/O Busses: PCI, USB, ATA, etc. 5F is an unrecoverable error. Start with PCI.
60 – 6F Reserved for future use (for new busses).
70 – 7F Output Devices: All output consoles. 7F is an unrecoverable error.
80 – 8F Reserved for future use (new output console codes).
90 – 9F Input devices: Keyboard/Mouse. 9F is an unrecoverable error.
A0 – AF Reserved for future use (new input console codes).
B0 – BF Boot Devices: Includes fixed media and removable media. BF is an unrecoverable error.
C0 – CF Reserved for future use.
D0 – DF Boot device selection.
E0 – FF E0 – EE: Miscellaneous codes. See Table 41.
EF: boot/S3 resume failure.
F0 – FF: FF processor exception.

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Intel DH55TC Specifications

Add-in Card Connectors IconAdd-in Card Connectors
PCI Express 2.0 x16 transfer speed8 GB/s
PCI Express 2.0 x1 transfer speed250 MB/s
Conventional PCI connectors count1
Front Panel USB Headers IconFront Panel USB Headers
USB 2.0 specification complianceYes
+5 V DC power on USB headersFused
USB Header 2 Pin 10 routingHDD LED

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