SBA-7222G-T2 Blade Module User’s Manual
A-2 BIOS POST Codes
This section lists the POST
Recoverable POST Errors
When a recoverable type of error occurs during POST, the BIOS will display an POST code that describes the problem. BIOS may also issue one of the following beep codes:
•One long and two short beeps – video configuration error
•One repetitive long beep – no memory detected
Terminal POST Errors
If a terminal type of error occurs, BIOS will shut down the system. Before doing so, BIOS will write the error to port 80h, attempt to initialize video and write the error in the top left corner of the screen.
The following is a list of codes that may be written to port 80h.
Uncompressed Initialization Codes
The uncompressed initialization checkpoint codes are listed in order of execution in table Table
| Table | |
|
| |
Post Code | Description | |
D0h | The NMI is disabled. Power on delay is starting. Next, the initialization | |
code checksum will be verified. | ||
| ||
|
| |
D1h | Initializing the DMA controller, performing the keyboard controller 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. | ||
| ||
| Passing control to the uncompressed code in shadow RAM at | |
D5h | E000:0000h. The initialization code is copied to segment 0 and control | |
| will be transferred to segment 0. | |
|
| |
| Control is in segment 0. Next, checking if <Ctrl> <Home> was pressed | |
D6h | and verifying the system BIOS checksum. If either <Ctrl> <Home> was | |
pressed or the system BIOS checksum is bad, next will go to checkpoint | ||
| ||
| code E0h. Otherwise, going to checkpoint code D7h. | |
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