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Intel® Entry Server Board SE7221BA1-E TPS
Error Message
NVRAM/CMOS/PASSWORD cleared by
Jumper
<CTRL_N> Pressed
7.10.2
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 tables below offer descriptions of the POST codes generated by the BIOS. Table 28
defines the uncompressed INIT code checkpoints, Table 29 describes the boot block recovery
code checkpoints, and Table 30 lists the runtime code uncompressed in F000 shadow RAM.
Some codes are repeated in the tables because that code applies to more than one operation.
Code
Description of POST Operation
D0
NMI is Disabled. Onboard KBC, RTC enabled (if present). Init code Checksum verification starting.
D1
Keyboard controller BAT test, CPU ID saved, and going to 4 GB flat mode.
D3
Do necessary chipset initialization, start memory refresh, and do memory sizing.
D4
Verify base memory.
D5
Init code to be copied to segment 0 and control to be transferred to segment 0.
D6
Control is in segment 0. To check recovery mode and verify main BIOS checksum. If either it is recovery
mode or main BIOS checksum is bad, go to check point E0 for recovery else go to check point D7 for
giving control to main BIOS.
D7
Find Main BIOS module in ROM image.
D8
Uncompress the main BIOS module.
D9
Copy main BIOS image to F000 shadow RAM and give control to main BIOS in F000 shadow RAM.
Code
Description of POST Operation
E0
Onboard Floppy Controller (if any) is initialized. Compressed recovery code is uncompressed in
F000:0000 in Shadow RAM and give control to recovery code in F000 Shadow RAM. Initialize interrupt
vector tables, initialize system timer, initialize DMA controller and interrupt controller.
E8
Initialize extra (Intel Recovery) Module.
E9
Initialize floppy drive.
EA
Try to boot from floppy. If reading of boot sector is successful, give control to boot sector code.
Revision 1.5
Explanation
NVRAM, CMOS, and passwords have been cleared. The system
should be powered down and the jumper removed.
CMOS is ignored and NVRAM is cleared. User must enter Setup.
Table 28. Uncompressed INIT Code Checkpoints
Table 29. Boot Block Recovery Code Checkpoints
System BIOS
45
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