BIOS Setup Error Codes
F-7
POST Codes (continued)
POST #
Designation
Description
C0
Turn ON/OFF Cache
OEM Specific - Cache control.
Boot Block: First POST.
C1
Memory presence
OEM Specific - Test to size on-
board memory test.
Boot Block: Search for Boot
Block Signature “*BBSS*”.
C2
Early Memory Initialization
OEM Specific - Board Initialization.
C3
Extended Memory Initialization
OEM Specific - Turn ON
extended memory DRAM select.
Boot Block: Expand compressed
BIOS
C4
Special Display Switch Handling
OEM Specific - Display/Video switch handling so that display switch
errors never occur.
C5
Early Shadow
OEM Specific - Early Shadow
enable for fast boot.
Boot Block: Early Shadow
System BIOS.
C6
Cache Programming
OEM Specific - Routine for
programming which region are
cacheable.
Boot Block: Cache Sizing
C7
Reserved Reserved
C8
Special Speed Switching
OEM Specific - Routine to handle speed switching.
C9
Special Shadow Handling
OEM Specific - Normal Shadow routine.
CA
Very Early Initialization
OEM Specific – Initialize hardware before any other hardware
initialization.
CB-CF
Reserved Reserved
D0
Power Management Full speed
Trying to go back or into full speed mode.
D1
Power Management -- Doze
mode
Trying to go or in Doze mode.
D2
Power Management --Sleep
mode
Trying to go or in Sleep mode.
D3
Power Management – Suspend
mode
Trying to go or in Suspend mode.
D4-DF
Debug
Available POST codes for use by source code customers during
development.
E0
Reserved Reserved
E1-EE
Setup Page
Page 1 to Page 14
EF
Shadow Error
In POST 6 to signal a Shadow Error.
F0-FE
Reserved Reserved
FF
Boot
The system is now booted or waiting for an OS.
