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After the diagnostic routine is completed, the HDD status indicator lights purple indicating the system has passed all diagnostic tests. 7. A copy of the test result will be saved as a log file (i.e., 66380AC3.LOG) and stored in the Results folder.The name of the log file is based on the last 8 bytes of the serial number Debug card The debug card is a diagnostic tool for technicians to configure the system BIOS settings and conveniently troubleshoot various problems. This card can help you track the progress of a Power-On Self Test (POST) and discover the cause of errors during system operations. The debug card connects to the system via its debug card cable connector. It includes a VGA port for connecting an external monitor to view BIOS output checkpoints. The debug card also provides a PS/2 mouse port, PS/2 keyboard port and a serial port. Identifying the components No. Component 1 Debug card cable connector 2 PS/2 mouse and keyboard port 3 VGA/monitor port 4 Serial port For more information on how to connect the debug card to the system, refer to “Entering the BIOS Setup Utility” on page 10. 44 Chapter 4 POST Code Checkpoints The Power-On Self Test (POST) is a BIOS procedure that boots the system, initializes and diagnoses the system components, and controls the operation of the power-on password option. If POST discovers errors in system operations at power-on, it displays error messages, generates a checkpoint code at port 80h or even halts the system if the error is fatal. The main components on the system board that must be diagnosed and/or initialized by POST to ensure system functionality are as follows: . Microprocessor with built-in numeric coprocessor and cache memory subsystem . Direct memory access (DMA) controller (8237 module) . Interrupt system (8259 module) . Three programmable timers (system timer and 8254 module) . ROM subsystem . RAM subsystem . CMOS RAM subsystem and real time clock/calendar with battery backup When POST executes a task, it uses a series of preset numbers called checkpoints to be latched at port 80h, indicating the stages it is currently running. This latch can be read and shown on an external monitor connected to the debug card. Viewing BIOS checkpoints Viewing all checkpoints generated by the BIOS requires a debug card and an external monitor. Checkpoints may appear on the bottom right corner of the screen during POST. POST code checkpoints list Bootblock initialization code checkpoint The following table describes the Award common tasks carried out by POST. An unique checkpoint number denotes each task. . Checkpoint Description Before D1 Early chipset initialization is done. Early super I/O initialization is done including RTC and keyboard controller. NMI is disabled. D1 Perform keyboard controller BAT test. Check if waking up from power management suspend state. Save power-on CPUID value in scratch CMOS. D0 Go to flat mode with 4GB limit and GA20 enabled. Verify the bootblock checksum. D2 Disable CACHE before memory detection. Execute full memory sizing module. Verify that flat mode is enabled. D3 If memory sizing module not executed, start memory refresh and do memory sizing in Bootblock code. Do additional chipset initialization. Re-enable CACHE. Verify that flat mode is enabled. D4 Test base 512KB memory. Adjust policies and cache first 8MB. Set stack. D5 Bootblock code is copied from ROM to lower system memory and control is given to it. BIOS now executes out of RAM. D6 Both key sequence and OEM specific method is checked to determine if BIOS recovery is forced. Main BIOS checksum is tested. If BIOS recovery is necessary, control flows to checkpoint E0. See Bootblock Recovery Code Checkpoints section of document for more information. Chapter 4 45 Checkpoint Description D7 Restore CPUID value back into register. The Bootblock-Runtime interface module is moved to system memory and control is given to it. Determine whether to execute serial flash. D8 The Runtime module is uncompressed into memory. CPUID information is stored in memory. D9 Store the Uncompressed pointer for future use in PMM. Copying Main BIOS into memory. Leaves all RAM below 1MB Read-Write including E000 and F000 shadow areas but closing SMRAM. DA Restore CPUID value back into register. Give control to BIOS POST (ExecutePOSTKernel). See POST Code Checkpoints section of document for more information. Bootblock recovery code checkpoints The Bootblock recovery code gets control when the BIOS determines that a BIOS recovery needs to occur because the user has forced the update or the BIOS checksum is corrupt. The following table describes the type of checkpoints that may occur during the Bootblock recovery portion of the BIOS: Checkpoint Description E0 Initialize the floppy controller in the super I/O. Some interrupt vectors are initialized. DMA controller is initialized. 8259 interrupt controller is initialized. L1 cache is enabled. E9 Set up floppy controller and data. Attempt to read from floppy....
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