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Intel D845GLLY Using Manual

Intel D845GLLY Using Manual

Desktop boards using the 845gl chipset
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Technical Product Specification
for Intel
using the Intel
®
®
Intel
Desktop Boards using the Intel
Current characterized errata are documented in the Specification Update for Intel Desktop Boards using the Intel 845GL Chipset.
®
845GL Chipset may contain design defects or errors known as errata that may cause the product to deviate from published specifications.
Desktop Boards
845GL Chipset
®
April 2002
Order Number: A90788-001

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Summary of Contents for Intel D845GLLY

  • Page 1 Desktop Boards using the Intel 845GL Chipset may contain design defects or errors known as errata that may cause the product to deviate from published specifications. Current characterized errata are documented in the Specification Update for Intel Desktop Boards using the Intel 845GL Chipset.

  • Page 2: Revision History

    Intel products are not intended for use in medical, life saving, or life sustaining applications or for any other application in which the failure of the Intel product could create a situation where personal injury or death may occur.

  • Page 3: Intended Audience

    Preface This Technical Product Specification (TPS) describes the features common to Intel Desktop Boards using the Intel 845GL Chipset. This specification is to be used with Product Supplement documents (available separately) that describe features unique to individual members of the product family.
  • Page 4 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset INTEGRATOR’S NOTES Integrator’s notes are used to call attention to information that may be useful to system integrators. CAUTION Cautions are included to help you avoid damaging hardware or losing data.

  • Page 5: Table Of Contents

    1.1.1 Feature Summary ..................9 1.1.2 Block Diagram....................11 Online Support ......................12 Operating System Support ..................12 Design Specifications ....................13 Processor ........................17 System Memory ......................18 ® Intel 845GL Chipset ....................20 ® 1.7.1 Intel Extreme Graphics Controller...............20 1.7.2 USB......................25 1.7.3 IDE Interfaces ....................25 1.7.4...
  • Page 6 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 3 BIOS Overview Introduction.........................45 BIOS Flash Memory Organization ................45 Resource Configuration ....................45 3.3.1 PCI Autoconfiguration ..................45 3.3.2 PCI IDE Support...................45 System Management BIOS (SMBIOS) ...............46 Legacy USB Support ....................47 BIOS Updates ......................47...
  • Page 7 Contents 5 Error Messages and Beep Codes BIOS Error Messages....................75 Port 80h POST Codes....................77 Bus Initialization Checkpoints ..................81 Speaker ........................82 BIOS Beep Codes ......................82 Figures Block Diagram ......................11 Tables Feature Summary......................9 Specifications ......................13 Supported DDR DIMM Configurations ................19 Supported SDR DIMM Configurations ................19 Direct Draw Supported Modes..................21 Video BIOS Video Modes Supported for Analog CRTs..........22 Supported Configuration Modes .................23...
  • Page 8 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset USB Configuration Submenu..................66 Chipset Configuration Submenu .................67 Security Menu ......................68 Power Menu .......................69 ACPI Submenu......................69 Boot Menu ........................70 Boot Device Priority Submenu ..................71 Hard Disk Drives Submenu ..................72 Removable Devices Submenu..................72...

  • Page 9: Product Description

    Memory support (DDR SDRAM or SDR SDRAM) is product-dependent. For more information, refer to the Product Supplement Document for your Desktop Board. Contact your Intel sales representative to determine if the audio subsystem is present on your Intel Desktop Board.
  • Page 10 The board’s compliance level with ACPI, Plug and Play, and SMBIOS Section 1.4, page 13 Available configurations for Intel Desktop Boards using the Intel 845GL Chipset Section 1.2, page 12 Contact your Intel sales representative to determine if the LAN subsystem is present on your Intel Desktop Board.

  • Page 11: Block Diagram

    Processor Socket (400 MHz) Intel 82845GL Intel 82801DB 4 Mbit Graphics and I/O Controller Hub Firmware Hub Memory Controller (ICH4) (FWH) Hub (GMCH) Intel 845GL Chipset CSMA/CD Display Unit Interface Interface VGA Port Memory Bus Physical DIMM Banks (2) Layer SMBus...

  • Page 12: Online Support

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 1.2 Online Support To find information about… Visit this World Wide Web site: Intel Desktop Boards using the Intel http://www.intel.com/design/motherbd 845GL Chipset under “Product Info” or “Customer Support”...

  • Page 13: Design Specifications

    The information is Name Title and Ownership available from… AC ’97 Audio Codec ’97 Revision 2.2, ftp://download.intel.com/ial/ September 2000, scalableplatforms/ac97r22.pdf Intel Corporation. ACPI Advanced Configuration Version 1.0b, http://www.acpi.info/ and Power Interface July 01, 1998, spec10b.htm Specification Intel Corporation, Microsoft Corporation, and Toshiba Corporation.
  • Page 14 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 2. Specifications (continued) Reference Specification Version, Revision Date and The information is Name Title Ownership available from… Double Data Rate (DDR) Version 1.0, http://www.jedec.org/ SDRAM Specification June 2000,...
  • Page 15 Plug and Play BIOS Version 1.0a, http://www.microsoft.com/ Play Specification May 5, 1994, hwdev/respec/ Compaq Computer Corporation, pnpspecs.htm Phoenix Technologies Limited, and Intel Corporation. Preboot Execution Version 2.1, ftp://download.intel.com/ial/ Environment September 20, 1999, wfm/pxespec.pdf Intel Corporation. PC SDRAM Unbuffered Revision 1.0, http://www.intel.com/...
  • Page 16 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 2. Specifications (continued) Reference Specification Version, Revision Date The information is Name Title and Ownership available from… UHCI Universal Host Controller Revision 1.1, http://www.usb.org/ Interface Design Guide March 1996, developers/docs.html...

  • Page 17: Processor

    Use of unsupported processors can damage the Desktop Board, the processor, and the power ® supply. See the Specification Update for Intel Desktop Boards using the Intel 845GL Chipset for the most up-to-date list of supported processors for these boards. The Desktop Boards support the following •...

  • Page 18: System Memory

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 1.6 System Memory The Desktop Boards provide the following memory features: • Two DIMM sockets supporting one of the following  2.5 V (only) 184-pin 200/266 MHz Double Data Rate (DDR) SDRAM DIMMs with gold- plated contacts, or ...

  • Page 19: Supported Ddr Dimm Configurations

    Product Description Table 3 lists the supported DDR DIMM configurations. Table 3. Supported DDR DIMM Configurations DIMM Configuration DDR SDRAM DDR SDRAM Organization Number of DDR Capacity (Note) Density Front-side/Back-side SDRAM Devices 32 MB 64 Mbit 4 M x 16/empty 64 MB 64 Mbit 8 M x 8/empty...

  • Page 20: Intel ® 845Gl Chipset

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 1.7 Intel ® 845GL Chipset The Intel 845GL chipset consists of the following devices: • Intel 82845GL Graphics and Memory Controller Hub (GMCH) with Accelerated Hub Architecture (AHA) bus •...

  • Page 21: Direct Draw Supported Modes

    Product Description INTEGRATOR’S NOTE EMC emission testing of high-speed video was performed on this Desktop Board using scrolling H’s displayed on the video monitor in accordance with ANSI C63.4-2000 documentation. The scrolling H’s are displayed using the following font sizes: •...

  • Page 22: Video Bios Video Modes Supported For Analog Crts

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 6 lists the video BIOS video modes supported by the graphics subsystem. Table 6. Video BIOS Video Modes Supported for Analog CRTs Available Refresh Resolution Color Palette...

  • Page 23: Supported Configuration Modes

    Product Description Table 7 lists the supported configuration modes of the graphics subsystem. Table 7. Supported Configuration Modes Available Refresh Supported bpp Configuration Mode Resolution Frequencies (Hz) (see Table 8 for more information) 640 x 480 60, 72, 75, 85, 100, 120 800 x 600 60, 72, 75, 85, 100, 120 1024 x 768...

  • Page 24: Details Of Bpp Configuration Modes

    1.7.1.2 Zone Rendering Technology (ZRT) The Intel Extreme Graphics Controller supports Zone Rendering Technology (ZRT). ZRT is a process by which the screen is divided into several zones. Each zone is completely cached and rendered on chip before being written to the frame buffer. The benefits of ZRT include the following: •...

  • Page 25: Usb

    For information about Refer to Obtaining the Zone Rendering white paper http://developer.intel.com/design/chipsets/845gl/ 1.7.2 USB The Desktop Boards support up to four USB 2.0 ports, fully support UHCI and EHCI, and use UHCI- and EHCI-compatible drivers. For more than four USB devices, an external hub can be connected to any of the ports.

  • Page 26: Real-Time Clock, Cmos Sram, And Battery

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset The IDE interfaces also support ATAPI devices (such as CD-ROM drives) and ATA devices. The BIOS supports 48-bit Logical Block Addressing (LBA) and Extended Cylinder Head Sector (ECHS) translation modes. The drive reports the transfer rate and translation mode to the BIOS.

  • Page 27: Serial Ports

    The location of the serial port B connector is product dependent. For more information, refer to the Product Supplement Document for your Desktop Board. Contact your Intel sales representative to determine if the audio subsystem is present on your Intel Desktop Board.

  • Page 28: Audio Connectors

     Supports LAN wake capabilities The front panel audio connector is not present on all boards that contain the audio subsystem. Contact your Intel sales representative to determine if the front panel audio connector is present on your Intel Desktop Board.

  • Page 29: Intel ® 82562Et Platform Lan Connect Device

    Product Description 1.10.1 Intel ® 82562ET Platform LAN Connect Device The Intel 82562ET component provides an interface to the back panel RJ-45 connector with integrated LEDs. The Intel 82562ET provides the following functions: • Basic 10/100 Ethernet LAN connectivity •...

  • Page 30: Fan Monitoring

    The security feature uses a mechanical switch on the chassis that attaches to the chassis intrusion connector. The mechanical switch is open for normal computer operation. ✏ NOTE Chassis intrusion detection may be implemented using Intel LANDesk Client Manager or third- party software. 1.12 Power Management Power management is implemented at several levels, including: •...

  • Page 31: Acpi

    Product Description 1.12.1 ACPI ACPI gives the operating system direct control over the power management and Plug and Play functions of a computer. The use of ACPI with these Desktop Boards requires an operating system that provides full ACPI support. ACPI features include: •...

  • Page 32: Power States And Targeted System Power

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 1.12.1.1 System States and Power States Under ACPI, the operating system directs all system and device power state transitions. The operating system puts devices in and out of low-power states based on user preferences and knowledge of how devices are being used by applications.

  • Page 33: Hardware Support

    • Wake from USB • Wake from PS/2 keyboard • PME# signal wake-up support Standby current requirements are product dependent. For information on power usage and standby current requirements, refer to the Product Supplement Document for your Intel Desktop Board.

  • Page 34: Fan Connector Function/Operation

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset LAN wake capabilities and Instantly Available PC technology require power from the +5 V standby line. The sections discussing these features describe the incremental standby power requirements for each.
  • Page 35 The use of Instantly Available PC technology requires operating system support and PCI 2.2 compliant add-in cards and drivers. Standby current requirements are product dependent. For information on power usage and standby current requirements, refer to the Product Supplement Document for your Intel Desktop Board.
  • Page 36 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 1.12.2.5 +5 V Standby Power Indicator LED The +5 V standby power indicator LED shows that power is still present even when the computer appears to be off.

  • Page 37: Technical Reference

    2 Technical Reference 2.1 Introduction Sections 2.2 - 2.6 contain several standalone tables. Table 14 describes the system memory map, Table 15 shows the fixed I/O map, Table 16 lists the DMA channels, Table 17 defines the PCI configuration space map, and Table 18 describes the interrupts. The remaining sections in this chapter are introduced by text found with their respective section headings.

  • Page 38: Fixed I/O Map

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 2.3 Fixed I/O Map Table 15. Fixed I/O Map Address (hex) Size Description 0000 - 00FF 256 bytes Used by the Desktop Board. Refer to the ICH4 data sheet for dynamic addressing information.

  • Page 39: Dma Channels

    Number (hex) Description Memory controller of Intel 82845GL component Intel Extreme Graphics controller Hub link to PCI bridge Intel 82801DB ICH4 PCI to LPC bridge IDE controller SMBus controller AC ’97 audio controller AC ’97 modem controller (optional) USB UHCI controller 1...

  • Page 40: Interrupts

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 2.6 Interrupts The interrupts can be routed through either the Programmable Interrupt Controller (PIC) or the Advanced Programmable Interrupt Controller (APIC) portion of the ICH4 component. The PIC is supported in Windows 98 SE and Windows ME and uses the first 16 interrupts.

  • Page 41: Pci Interrupt Routing Map

    Technical Reference 2.7 PCI Interrupt Routing Map This section describes interrupt sharing and how the interrupt signals are connected between the PCI bus connectors and onboard PCI devices. The PCI specification specifies how interrupts can be shared between devices attached to the PCI bus. In most cases, the small amount of latency added by interrupt sharing does not affect the operation or throughput of the devices.

  • Page 42: Pci Interrupt Routing Map

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 19. PCI Interrupt Routing Map ICH4 PIRQ Signal Name PCI Interrupt Source PIRQA PIRQB PIRQC PIRQD PIRQE PIRQF PIRQG PIRQH ICH4 USB UHCI controller 1 INTA SMBus controller...

  • Page 43: Environmental

    Technical Reference 2.8 Environmental Table 20 lists the environmental specifications for the Desktop Boards. Table 20. Desktop Board Environmental Specifications Parameter Specification Temperature -40 °C to +70 °C Non-Operating 0 °C to +55 °C Operating Shock Unpackaged 50 g trapezoidal waveform Velocity change of 170 inches/second Packaged Half sine 2 millisecond...
  • Page 44 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset...

  • Page 45: Bios Overview

    3 BIOS Overview 3.1 Introduction The Desktop Boards use an Intel/AMI BIOS that is stored in the Firmware Hub (FWH) and can be updated using a disk-based program. The FWH contains the BIOS Setup program, POST, the PCI auto-configuration utility, and Plug and Play support.

  • Page 46: System Management Bios (Smbios)

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset determines the capabilities of each drive and configures them to optimize capacity and performance. To take advantage of the high capacities typically available today, hard drives are automatically configured for Logical Block Addressing (LBA) and to PIO Mode 3 or 4, depending on the capability of the drive.

  • Page 47: Legacy Usb Support

    Legacy USB support is for keyboards, mice, and hubs only. Other USB devices are not supported in legacy mode. 3.6 BIOS Updates The BIOS can be updated using either of the following utilities, which are available on the Intel World Wide Web site: •...

  • Page 48: Language Support

    During POST, an Intel splash screen is displayed by default. This splash screen can be replaced with a custom splash screen. A utility is available from Intel to assist with creating a custom splash screen. The custom splash screen can be programmed into the flash memory using the BIOS upgrade utility.

  • Page 49: Recovering Bios Data

    To create a BIOS recovery diskette, a bootable diskette must be created and the BIOS update files copied to it. BIOS upgrades and the Intel Flash Memory Update Utility are available from Intel Customer Support through the Intel World Wide Web site.

  • Page 50: Network Boot

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 3.8.2 Network Boot The network can be selected as a boot device. This selection allows booting from the onboard LAN or a network add-in card with a remote boot ROM installed.

  • Page 51: Intel Rapid Bios Boot

    It is possible to optimize the boot process to the point where the system boots so quickly that the Intel logo screen (or a custom logo splash screen) will not be seen. Monitors and hard disk drives with minimum initialization times can also contribute to a boot time that might be so fast that necessary logo screens and POST messages cannot be seen.

  • Page 52: Supervisor And User Password Functions

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset • Setting the user password restricts who can boot the computer. The password prompt will be displayed before the computer is booted. If only the supervisor password is set, the computer boots without asking for a password.

  • Page 53: Bios Setup Program

    4 BIOS Setup Program 4.1 Introduction The BIOS Setup program can be used to view and change the BIOS settings for the computer. The BIOS Setup program is accessed by pressing the <F2> key after the Power-On Self-Test (POST) memory test begins and before the operating system boot begins. The menu bar is shown below. Maintenance Main Advanced Security...

  • Page 54: Maintenance Menu

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 4.2 Maintenance Menu To access this menu, select Maintenance on the menu bar at the top of the screen. Main Advanced Security Power Boot Exit Maintenance The menu shown in Table 25 is for clearing Setup passwords and enabling extended configuration mode.

  • Page 55: Advanced Menu

    BIOS Setup Program 4.4 Advanced Menu To access this menu, select Advanced on the menu bar at the top of the screen. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration Chipset Configuration...

  • Page 56: Pci Configuration Submenu

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 4.4.1 PCI Configuration Submenu To access this submenu, select Advanced on the menu bar and then PCI Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration...

  • Page 57: Boot Configuration Submenu

    BIOS Setup Program 4.4.2 Boot Configuration Submenu To access this submenu, select Advanced on the menu bar and then Boot Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration Chipset Configuration...

  • Page 58: Peripheral Configuration Submenu

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 4.4.3 Peripheral Configuration Submenu To access this submenu, select Advanced on the menu bar and then Peripheral Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration...
  • Page 59 BIOS Setup Program Table 30. Peripheral Configuration Submenu (continued) Feature Options Description • IRQ 3 Interrupt Specifies the interrupt for serial port B, if serial port B is set to (This feature is displayed (default) Enabled. only if Serial Port B is set •...

  • Page 60: Ide Configuration Submenu

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 4.4.4 IDE Configuration Submenu To access this submenu, select Advanced on the menu bar and then IDE Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration...

  • Page 61: Primary/Secondary Ide Master/Slave Submenus

    BIOS Setup Program 4.4.4.1 Primary/Secondary IDE Master/Slave Submenus To access these submenus, select Advanced on the menu bar, then IDE Configuration, and then the master or slave to be configured. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Primary IDE Master...
  • Page 62 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 32. Primary/Secondary IDE Master/Slave Submenus (continued) Feature Options Description • Disabled Block Mode Disabled = Data transfers to/from the device occur one sector at a time. • Auto (default)

  • Page 63: Diskette Configuration Submenu

    BIOS Setup Program 4.4.5 Diskette Configuration Submenu To access this menu, select Advanced on the menu bar and then Diskette Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration Chipset Configuration...

  • Page 64: Event Log Configuration Submenu

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 4.4.6 Event Log Configuration Submenu To access this menu, select Advanced on the menu bar and then Event Log Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration...

  • Page 65: Video Configuration Submenu

    BIOS Setup Program 4.4.7 Video Configuration Submenu To access this menu, select Advanced on the menu bar and then Video Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration Chipset Configuration...

  • Page 66: Usb Configuration Submenu

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 4.4.8 USB Configuration Submenu To access this menu, select Advanced on the menu bar and then USB Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration...

  • Page 67: Chipset Configuration Submenu

    BIOS Setup Program 4.4.9 Chipset Configuration Submenu To access this menu, select Advanced on the menu bar and then Chipset Configuration. Maintenance Main Security Power Boot Exit Advanced PCI Configuration Boot Configuration Peripheral Configuration IDE Configuration Diskette Configuration Event Log Configuration Video Configuration USB Configuration Chipset Configuration...

  • Page 68: Security Menu

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 37. Chipset Configuration Submenu (continued) Feature Options Description • Auto (default) SDRAM Timing Control Auto = Timings will be programmed according to the memory detected. • Manual – Aggressive Manual –...

  • Page 69: Power Menu

    BIOS Setup Program 4.6 Power Menu To access this menu, select Power from the menu bar at the top of the screen. Maintenance Main Advanced Security Boot Exit Power ACPI The menu represented in Table 39 is for setting the power management features. Table 39.

  • Page 70: Boot Menu

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 4.7 Boot Menu To access this menu, select Boot from the menu bar at the top of the screen. Maintenance Main Advanced Security Power Exit Boot Boot Device Priority...

  • Page 71: Boot Device Priority Submenu

    The default settings for the first through fourth boot devices are, respectively: • Removable Dev. • Hard Drive • ATAPI CD-ROM • Intel Boot Agent Note: The boot device identifier for Intel Boot Agent (IBA) may vary depending on the BIOS release.

  • Page 72: Hard Disk Drives Submenu

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset 4.7.2 Hard Disk Drives Submenu To access this menu, select Boot on the menu bar and then Hard Disk Drives. Maintenance Main Advanced Security Power Exit Boot Boot Device Priority...

  • Page 73: Atapi Cd-Rom Drives Submenu

    BIOS Setup Program 4.7.4 ATAPI CD-ROM Drives Submenu To access this menu, select Boot on the menu bar and then ATAPI CD-ROM Drives. Maintenance Main Advanced Security Power Exit Boot Boot Device Priority Hard Disk Drives Removable Devices ATAPI CD-ROM Drives The submenu represented in Table 45 is for setting ATAPI CD-ROM drive priority.
  • Page 74 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset...

  • Page 75: Error Messages And Beep Codes

    5 Error Messages and Beep Codes 5.1 BIOS Error Messages Table 47 lists the error messages and provides a brief description of each. Table 47. BIOS Error Messages Error Message Explanation GA20 Error An error occurred with Gate A20 when switching to protected mode during the memory test.
  • Page 76 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 47. BIOS Error Messages (continued) Error Message Explanation Memory Size Decreased Memory size has decreased since the last boot. If no memory was removed then memory may be bad.

  • Page 77: Port 80H Post Codes

    F000:0000 in Shadow RAM and give control to recovery code in F000 Shadow RAM. Initialize interrupt vector tables, initialize system timer, initialize DMA controller and interrupt controller. Initialize extra (Intel Recovery) Module. Initialize floppy drive. Try to boot from floppy. If reading of boot sector is successful, give control to boot sector code.

  • Page 78: Runtime Code Uncompressed In F000 Shadow Ram

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 50. Runtime Code Uncompressed in F000 Shadow RAM Code Description of POST Operation NMI is Disabled. To check soft reset/power-on. BIOS stack set. Going to disable cache if any.
  • Page 79 Error Messages and Beep Codes Table 50. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation To prepare the descriptor tables. To enter in virtual mode for memory test. To enable interrupts for diagnostics mode. To initialize data to check memory wrap around at 0:0. Data initialized.
  • Page 80 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 50. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation Lock-key checking over. To check for memory size mismatch with CMOS. Memory size check done. To display soft error and check for password or bypass setup.

  • Page 81: Bus Initialization Checkpoints

    Error Messages and Beep Codes Table 50. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation Uncompress SMBIOS module and init SMBIOS code and form the runtime SMBIOS image in shadow. Going to copy any code to specific area. Copying of code to specific area done.

  • Page 82: Speaker

    Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset Table 53 describes the lower nibble of the high byte and indicates the bus on which the routines are being executed. Table 53. Lower Nibble High Byte Functions...

  • Page 83: Beep Codes

    Error Messages and Beep Codes If POST completes normally, the BIOS issues one short beep before passing control to the operating system. Table 54. Beep Codes Beep Description Refresh failure Parity cannot be reset First 64 KB memory failure Timer not operational Not used 8042 GateA20 cannot be toggled Exception interrupt error...
  • Page 84 Technical Product Specification for Intel Desktop Boards using the Intel 845GL Chipset...

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