Gateway 5860 manual Viewing Bios checkpoints, Bootblock Initialization Code Checkpoints

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Checkpoints

A checkpoint is either a byte or word value output to I/O port 80h. The BIOS outputs checkpoints throughout bootblock and Power-On Self Test (POST) to indicate the task the system is currently executing. Checkpoint sare very useful in aiding software developers or technicians in debugging problems that occur during the pre- boot process.

Viewing BIOS checkpoints

Viewing all checkpoints generated by the BIOS requires acheckpoint card, also referred to as a POST card or POST diagnostic card. These are ISA or PCI add-in cards that show the value of I/O port 80h on a LED display. Checkpoints may appear on the bottom right corner of the screen during POST. This display method islimited, since it only displays checkpoints that occur after the video card has been activated.

Bootblock Initialization Code Checkpoints

The Bootblock initialization code sets up the chipset, memory, and other components before system memory is available. The following table describes the type of checkpoints that may occur during the bootblock initialization portion of the BIOS.

NOTE: Please note that checkpoints may differ between different platforms based on system configuration. Checkpoints may change due to vendor requirements, system chipset or option ROMs from add-in PCI devices.

 

Checkpoint

 

Description

 

 

 

 

 

 

 

 

If boot block debugger is enabled, CPU cache-as-RAM functionality is enabled at this

 

 

Before D0

point. Stack will be enabled from this point.

 

 

 

Early Boot Strap Processor (BSP) initialization like microcode update, frequency and

 

 

D0

other CPU critical initialization.

Early chipset initialization is done.

 

 

 

Early super I/O initialization is done including RTC and keyboard controller. Serial port

 

 

 

is

 

 

 

 

enabled at this point if needed for debugging. NMI is disabled. Perform keyboard

 

 

 

controller BAT test. Save power-on CPUID value in scratch CMOS. Go to flat mode

 

 

D1

with 4GB limit and GA20 enabled.

 

 

D2

Verify the boot block checksum.

System will hang here if checksum is bad.

 

 

 

Disable CACHE before memory detection. Execute full memory sizing module. If

 

 

 

memory sizing module not executed, start memory refresh and do memory sizing in

 

 

 

Boot block code. Do additional chipset initialization. Re-enable CACHE. Verify

 

 

D3

that flat mode is enabled.

 

 

 

D4

Test base 512KB memory. Adjust policies and cache first 8MB. Set stack.

 

 

 

Bootblock code is copied from ROM to lower system memory and control is given to it.

 

 

 

BIOS now executes out of RAM. Copies compressed boot block code to memory in

 

 

 

right segments. Copies BIOS from ROM to RAM for faster access. Performs main

 

 

D5

BIOS checksum and updates recovery status accordingly.

 

 

 

Both key sequence and OEM specific method is checked to determine if BIOSrecovery

 

 

 

is forced. Main BIOS checksum is tested. If BIOS recovery is necessary,control

 

 

 

flows to checkpoint E0. See Bootblock Recovery Code Checkpoints sectionfor more

 

 

D6

information.

 

 

 

 

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

 

 

D7

serial flash.

 

 

 

 

The Runtime module is uncompressed into memory. CPUID information is stored in

 

 

D8

memory.

 

 

 

 

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

 

 

D9

areas but closing SMRAM.

 

 

 

 

 

 

 

63

 

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Contents Gateway IXtreme 5860 Service Guide Revision History Copyright Disclaimer Messages ConventionsFRU Information Service Guide CoverageTable of Contents Jumper and Connector Information Chassis Specification FeaturesPage Socket Quantity Motherboard SpecificationIntel HD graphic solution Controller Realtek 8111E Gigabit Ethernet controller Controller Super I/O ITE Intel 1155 CPU socket Block Diagram Chapter Cmos Setup UtilityNavigating Through the Setup Utility Entering Cmos setupParameter Description Setup Utility MenusProduct Information Standard Cmos Features Parameter Description Option Advanced Bios FeatureAMD-V Advanced Chipset FeaturesUMA Integrated PeripheralsPower Management Setup PC Health Status Frequency/Voltage Control User Password Bios Security FeaturesLoad Default Settings Save & Exit Setup Exit Without Saving Disassembly Requirements System Disassembly and AssemblyPre-disassembly Procedure Removing the Side Panel Removing the Front Bezel Removing the Top Bezel Removing the VGA Card Gently pull the card to remove it from the main board PCI-E Removing the TV Card Removing the System Fan Removing the Power Supply Lift the power supply module out of the chassis Removing the Optical Drive Removing the Hard Disk Drive Removing the Main board Punching in IO Shield then you can remove it Removing the Light Board Module and LED Cable Removing the Card Reader and LED Cable Assembly Removing the Front I/O Module Removing the Top USB Module Disconnet the USB cable away from USB board Assembly the Top USB Module Disassembly ProcedurePage Assembly the Front I/O Module Assembly the Card Reader and LED Cable Assembly Assembly the Light Board Module and LED Cable Page Assembly the Main Board Assembly the Hard Disk Drive Assembly the Optical Drive Assembly the Power Supply Assembly the system Fan Assembly the TV Card Assembly the VGA Card Assembly the Top Bezel Assembly the Front Bezel Assembly the Side Panel Hardware Diagnostic Procedure System Trouble shootingSystem Internal Inspection System Check ProceduresPower System Check System External InspectionBeep Codes Memory not installed or memory errorCheckpoints Viewing Bios checkpointsBootblock Initialization Code Checkpoints E1-E8 Ecee Bootblock Recovery Code Checkpoints Bios Recovery Jumper Information Label Description Setting Jumper Jumper SettingPage Jumper Type Description Settingdefault FRU Field Replaceable Unit List DX4380G Exploded Diagram Description Qty Remark ATX IxtremeM5860 FRU ListHDD Seagate 128BITS Samsung DVI Hdmi DP W/ATX USB/P5

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