Acer G5900 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 thatoccur 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

 

 

Before D0

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

 

Stack will be enabled from this point.

 

 

D0

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

 

CPU critical initialization. Early chipset initialization is done.

 

 

D1

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 with 4GB limit and

 

GA20 enabled.

 

 

D2

Verify the boot block checksum. System will hang here if checksum is bad.

 

 

D3

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 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. Copies compressed boot block code to memory in right

 

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

 

checksum and updates recovery status accordingly.

 

 

D6

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 information.

 

 

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.

 

 

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Contents Acer Predator G5900 Service Guide Revision History Copyright Disclaimer Conventions Service Guide Coverage Table of Contents FRU Field Replaceable Unit List Chipset Operating SystemProcessor Memory subsystemGraphics Card Rear I/O connectorsInternal I/O Connectors & Headers Onboard LANSystem Bios Power supplyBlock Diagram Front Panel ComponentRear Panel IOS Hotkey List SpecificationProcessor Main Board Major ChipsMemory Combinations Slot Memory Total MemoryUSB Port Power ManagementSata Interface Environmental RequirementsGlobal Standby Mode Device Standby ModeSuspend Mode System Utilities Entering Cmos setup Navigating Through the Setup UtilitySetup Utility Menus Parameter DescriptionProduct Information Standard Cmos Features Parameter Description OptionAdvanced Bios Feature EnabledAdvanced Chipset Features Integrated Peripherals AutoPower Management Setup PC Health Status Frequency/Voltage Control Press Enter Bios Security Features Setting a supervisor passwordLoad Default Settings Save & Exit Setup Exit Without Saving System Disassembly Pre-disassembly Procedure Removing the Side Panel Removing the Front Bezel Removing the Heat Sink Fan Assembly Lift the heat sink fan assembly away from the mainboard Removing the Processor Removing the VGA Card Gently pull the card to remove it from the mainboard Chapter Removing the Wireless LAN Card Removing the Memory Modules Removing the System Fan Removing the Daughter Board Chapter Removing Other Side Panel Removing the Hard Disk Drive Page Removing the Removable Hard Disk Drive Page Chapter Removing the Optical Drive Chapter Removing the Power Supply Removing the Motherboard Lift the board from the chassis Chapter Remove the RTC battery Removing the Card Reader Pull the card reader board out of the bracket Removing the Top Cover Removing the Power Switch and LED Cable Assembly Page Removing the Front I/O and USB Board Page System Troubleshooting System External Inspection Power System CheckSystem Internal Inspection Beep Codes Bootblock Initialization Code Checkpoints Viewing Bios checkpointsCheckpoints System is waking from Acpi S3 state Bootblock Recovery Code Checkpoints Checkpoint DescriptionBios Recovery Jumper and Connector Information PlacementLabel Description Setting Jumper Jumper SettingChecking Jumper Settings Jumper Type Descriptio Setting default Pin Signal Name Connecting Optional DevicesSATA1~6 Serial ATA connectors FAUDIO1 Front Panel Audio header for AzaliaFUSB1~4 Front Panel USB headers GPIO0~1 Button recovery jumperPin Signal Name Function SPDIFOUT1 Spdif out headerCPUFAN1 CPU Cooling FAN Power Connector Connecting Case ComponentsAtxpower ATX 24-pin Power Connector ATX12V1 ATX 12V Power Connector SYSFAN1 System Cooling FAN Power ConnectorFront Panel Header FRU Field Replaceable Unit List Predator G5900 Exploded Diagram Name ’TY Predator G5900 FRU List Exploded SSD Intel SSD Nand 80GB SSDSA2MJ080G2AC ODD Plds BD RW HH DL 6X DH-6B2SH LF+HF Exploded Intel RAID SOP Create Sata RAIDChapter Create Sata RAID Create Sata RAID 0+1 Page Intel RAID SOP Windows for WIN7 Page Picture6 Select Menber Hard Drives Picture7 Page Chapter Page Chapter Page Chapter

G5900 specifications

The Acer G5900 is a powerful and versatile desktop computer that has garnered attention for its performance and capability to cater to both casual users and gaming enthusiasts. Utilizing advanced technologies, the G5900 strikes a balance between efficiency and high-end specifications, making it a suitable choice for a variety of tasks.

At the heart of the Acer G5900 is its robust processor. The device typically comes equipped with Intel or AMD processors, such as the Intel Core i5 or the AMD Ryzen series, ensuring quick processing speeds and reliable performance for multitasking and demanding applications. This processing power is essential for handling everything from everyday productivity tasks to more intensive gaming and content creation.

The G5900 is designed with ample memory options, often featuring configurations with up to 16GB of RAM. This is particularly beneficial for users who run multiple applications simultaneously, as it allows for smooth transitions and swift response times. The option to expand memory further adds to its longevity and adaptability, catering to evolving user needs over time.

Storage options on the Acer G5900 include both traditional HDDs and faster SSDs, with capacities ranging from 512GB to 2TB. This flexibility allows users to choose a setup that best fits their requirements, whether they prioritize speed or storage capacity. The inclusion of an SSD can significantly enhance boot times and application loading, elevating the overall user experience.

One of the standout features of the G5900 is its graphics capabilities. Depending on the configuration, it can be equipped with dedicated graphics cards from NVIDIA or AMD, making it apt for gaming enthusiasts and creative professionals alike. These graphics options enable the G5900 to handle modern titles and complex software with ease.

Connectivity is also a key aspect of the Acer G5900. The desktop generally comes with multiple USB ports, HDMI outputs, and sometimes even USB-C connectivity, providing ample options for connecting peripherals and external displays. Wireless options, including Wi-Fi and Bluetooth, enhance its versatility, allowing for seamless integration into modern home networks.

In terms of design, the Acer G5900 showcases a sleek and modern aesthetic, with a compact form factor that fits well in various environments. Its efficient cooling system is designed to maintain optimal performance even during heavy usage while ensuring quiet operation.

Overall, the Acer G5900 combines power, versatility, and modern design. With its cutting-edge specifications, ample storage, and graphics options, it stands out as an excellent choice for users looking to enhance their computing experience, whether for work, play, or everything in between.
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