HP Kayak XU800 Series, Technical Reference Manual

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6 Tests and Error Messages
Order in Which POST Tests Are Performed
A Check Point Code allows you to follow the POST schedule on the MaxiLife
LCD panel. To achieve this, you first need to select the “Boot Step” option in
the “Service” menu of MaxiLife.
The following table lists the POST checkpoint codes written at the start of
each test and listed in order of execution.
Checkpoint
Code
POST Routine Description
(A Check Point Code is NOT an error code or error number)
Uncompressed Initialization Codes
D0h 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.
D3h Starting Memory sizing.
D4h Returning to real mode. Executing any patches and setting the stack.
D5h Passing control to the uncompressed code shadow RAM at E000:0000h. The initialization
code is copied to segment 0 and control will be transferred to segment 0.
D6h Control is segment 0. Next, checking if <Ctrl><Home> was pressed 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.
D7h Passing control to the interface module.
D8h Main system BIOS runtime code will be decompressed.
D9h Passing control to the main system BIOS in shadow RAM.
Bootblock Recovery Codes
E0h Onboard floppy disk driver controller is initialized. Next, beginning the base 512 KB
memory test.
E1h Initializing the interrupt vector table.
E2h Initializing the DMA and Interrupt controllers.
E6h Enabling the floppy disk drive controller, Timer IRQs and internal cache memory.