IBM 343 Manual De Usuario
98
A POST Error Codes, Messages and FRU to
Failure Information
The following tables define POST error codes and their associated messages. The BIOS will
prompt the user to press a key in case of serious errors. The string “Error” precedes some error
messages to highlight possible system malfunctions. The BIOS vendor specific error codes are not
listed here since not all error codes are applicable to every platform. All POST errors and warnings
are logged in the system event log unless it is full.
prompt the user to press a key in case of serious errors. The string “Error” precedes some error
messages to highlight possible system malfunctions. The BIOS vendor specific error codes are not
listed here since not all error codes are applicable to every platform. All POST errors and warnings
are logged in the system event log unless it is full.
After the video adapter has been successfully initialized, the BIOS indicates the current testing
phase during POST by writing a 2-digit hex code to I/O location 80h. If a Port-80h card (Postcard)
is installed, it displays this 2-digit code on a pair of hex display LEDs.
phase during POST by writing a 2-digit hex code to I/O location 80h. If a Port-80h card (Postcard)
is installed, it displays this 2-digit code on a pair of hex display LEDs.
Table 15. Port-80h Code Definition
Code
Meaning
CP
AMI check point (port-80) code
Table 16. Boot Block POST Codes
Checkpoint
Code
Code
Description
D0h
The NMI is disabled. Power-on delay is starting. Next, the initialization code checksum
will be verified.
will be verified.
D1h
Initializing the DMA controller, performing the keyboard controller Basic Acceptance Test
(BAT) test, starting memory refresh, and entering 4 GB flat mode next.
(BAT) test, starting memory refresh, and entering 4 GB flat mode next.
D3h
Starting memory sizing next.
D4h
Returning to real mode. Executing any OEM patches and setting the stack next.
D5h
Passing control to the uncompressed code in shadow RAM. The initialization code is
copied to segment 0 and control will be transferred to segment 0.
copied to segment 0 and control will be transferred to segment 0.
D6h
Control is in segment 0. Next verifying the system BIOS checksum.
If the system BIOS checksum is bad, go to checkpoint code E0h.
Otherwise, going to checkpoint code D7h.
If the system BIOS checksum is bad, go to checkpoint code E0h.
Otherwise, going to checkpoint code D7h.
D7h
Passing control to the interface module next.
D8h
The main system BIOS runtime code will be decompressed next.
D9h
Passing control to the main system BIOS in shadow RAM next.
03h
The NMI is disabled. Next, checking for a soft reset or a power-on condition.
05h
The BIOS stack has been built. Next, disabling cache memory.
06h
Uncompressing the POST code next