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BIOS Intel® Server Board SDS2
Revision 1.2
Order Number: A85874-002
46
The following table contains the POST codes displayed during the boot process. A beep code is
a series of individual beeps on the PC speaker, each of equal length. The following table
describes the error conditions associated with each beep code and the corresponding POST
checks point code as seen by a ‘port 80h’ card and LCD. For example, if an error occurs at
checkpoint 22h, a beep code of 1-3-1-1 is generated. The “-“ indicates a pause within the
sequence.
Some POST codes occur before the video display is initialized. To assist in determining the
fault, a unique beep-code is derived from these checkpoints as follows:
• The 8-bit test point is broken down to four 2-bit groups.
• Each group is made one-based (1 through 4)
• One to four beeps are generated based on each group’s 2-bit pattern.
Note: Not all POST codes generate a Beep Code.
Example:
Checkpoint 4Bh is divided into: 01 00 10 11
The beep code is: 2 – 1 – 3 – 4
Table 27. Standard BIOS POST Codes
CP Beeps Reason
01 Initialize BMC
02 Verify Real Mode
03 Test BMC
04 Get Processor type
06 Initialize system hardware
08 Initialize chipset registers with initial POST values
09 Set in POST flag
0A Initialize Processor registers
0B Enable Processor cache
0C Initialize caches to initial POST values
0E Initialize I/O
0F Initialize the local bus IDE
10 Initialize Power Management
11 Load alternate registers with initial POST values
12 Restore Processor control word during warm boot
13 Initialize PCI Bus mastering devices
14 Initialize keyboard controller
16 1-2-2-3 BIOS ROM checksum
17 Initialize external cache before memory auto size
18 8254 timer initialization
1A 8237 DMA controller initialization