Port 80H Post Codes; Port 80H Post Code Ranges - Intel BLKDH57DD Technical Product Specification

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.
The following tables provide information about the POST codes generated by the
BIOS:
• Table 45 lists the Port 80h POST code ranges
• Table 46 lists the Port 80h POST codes themselves
• Table 47 lists the Port 80h POST sequence
NOTE
In the tables listed above, all POST codes and range values are listed in hexadecimal.
Table 45. 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 46.
EF: boot/S3 resume failure.
F0 – FF: FF processor exception.
Error Messages and Beep Codes
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