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