Intel BOXDX79TO Product Specification - Page 75
Port 80h POST Codes
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Error Messages and Beep Codes 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 PCI bus connector 1. 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 Subsystem 0x00 - 0x05 Entering SX states S0 to S5. 0x10, 0x20, 0x30, Resuming from SX states. 0x10 - 0x20 - S2, 0x30 - S3, etc. 0x40, 0x50 0x08 - 0x0F Security (SEC) phase 0x11 - 0x1F PEI phase pre MRC execution 0x21 - 0x29 MRC memory detection 0x2A - 0x2F PEI phase post MRC execution 0x31 - 0x35 Recovery 0x36 - 0x3F Platform DXE driver 0x41 - 0x4F CPU Initialization (PEI, DXE, SMM) 0x50 - 0x5F 0x60 - 0x6F I/O Buses: PCI, USB, ATA etc. 0x5F is an unrecoverable error. Start with PCI. BDS 0x70 - 0x7F Output devices: All output consoles. 0x80 - 0x8F For future use 0x90 - 0x9F Input devices: Keyboard/Mouse. 0xA0 - 0xAF For future use 0xB0 - 0xBF Boot Devices: Includes fixed media and removable media. Not that critical since consoles should be up at this point. 0xC0 - 0xCF For future use 0xD0 - 0xDF For future use 0xF0 - 0xFF 75