Technical Product Specification

Intel Desktop Board DH61BF Technical Product Specification

4.3 BIOS Error Messages

Table 32 lists the error messages and provides a brief description of each.

Table 32. BIOS Error Messages

Error Message

Explanation

CMOS Battery Low

The battery may be losing power. Replace the battery soon.

CMOS Checksum Bad

The CMOS checksum is incorrect. CMOS memory may have been

corrupted. Run Setup to reset values.

Memory Size Decreased Memory size has decreased since the last boot. If no memory

was removed, then memory may be bad.

No Boot Device Available System did not find a device to boot.

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.

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

• Table 33 lists the Port 80h POST code ranges

• Table 34 lists the Port 80h POST codes themselves

• Table 35 lists the Port 80h POST sequence

NOTE

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

Table 33. Port 80h POST Code Ranges

Range Subsystem

0x00 – 0x05 Entering SX states S0 to S5.

0x10, 0x20, 0x30, 0x40, 0x50

Resuming from SX states. 0x10 –0x20 – S2, 0x30 – S3, etc.

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 I/O buses: PCI, USB, ATA, etc. 0x5F is an unrecoverable error. Start

with PCI.

0x60 – 0x6F BDS

0x70 – 0x7F Output devices: All output consoles.

0x80 – 0x8F For future use

0x90 – 0x9F Input devices: Keyboard/Mouse.

continued