DP35DP datasheet(66/84 Pages) INTEL

66 / 84 page

Intel Desktop Board DP35DP Technical Product Specification

4.4

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 PCI bus connector 1.

The following tables provide information about the POST codes generated by the

BIOS:

•

Table 36 lists the Port 80h POST code ranges

•

Table 37 lists the Port 80h POST codes themselves

•

Table 38 lists the Port 80h POST sequence

NOTE

In the tables listed above, all POST codes and range values are listed in hexadecimal.

Table 36. 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 37.

EF: boot/S3 resume failure.

F0 – FF: FF processor exception.

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