Appendix B: BIOS POST Codes

Appendix B

BIOS POST Codes

This section lists the POST (Power On Self Testing) Codes for the Award BIOS.

POST (hex)

Description

CFh

Test CMOS R/W functionality.

C0h

Early chipset initialization:

 

-Disable shadow RAM

 

-Disable L2 cache (socket 7 or below)

 

-Program basic chipset registers

C1h

Detect memory

 

-Auto-detection of DRAM size, type and ECC.

 

-Auto-detection of L2 cache (socket 7 or below)

C3h

Expand compressed BIOS code to DRAM

C5h

Call chipset hook to copy BIOS back to E000 & F000 shadow

 

RAM.

0h1

Expand the Xgroup codes locating in physical address 1000:0

02h

Reserved

03h

Initial Superio_Early_Init switch.

04h

Reserved

05h

1. Blank out screen

 

2. Clear CMOS error flag

06h

Reserved

07h

1. Clear 8042 interface

 

2. Initialize 8042 self-test

08h

1. Test special keyboard controller for Winbond 977 series Super

 

I/O chips.

 

2. Enable keyboard interface.

09h

Reserved

0Ah

Disable PS/2 mouse interface (optional).

 

Auto detect ports for keyboard & mouse followed by a port & interface swap

 

(optional).

 

Reset keyboard for Winbond 977 series Super I/O chips.

0Bh

Reserved

0Ch

Reserved

0Dh

Reserved

0Eh

Test F000h segment shadow to see whether it is R/W-able or not. If

 

test fails, keep beeping the speaker.

 

 

B-1

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SUPER MICRO Computer 5013C-M8 user manual Appendix B Bios Post Codes, Post hex Description

5013C-M8 specifications

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