Intel® Desktop Board D915GVWB Technical Product Specification October 2004 Order Number: C88968-002 The Intel® Desktop Board D915GVWB 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 Intel Desktop Board D915GVWB Specification Update.
Revision History Revision Revision History Date Intel® -001 First release of the Specification. Desktop Board D915GVWB Technical Product -002 Second release of the Intel® Desktop Board D915GVWB Technical Product Specification. September 2004 October 2004 This product specification applies to only standard Intel® Desktop Board D915GVWB with BIOS identifier WB91X10J.86A.
Preface This Technical Product Specification (TPS) specifies the board layout, components, connectors, power and environmental requirements, and the BIOS for the Intel® Desktop Board D915GVWB. It describes the standard product and available manufacturing options. Intended Audience The TPS is intended to provide detailed, technical information about the Desktop Board D915GVWB and their components to the vendors, system integrators, and other engineers and technicians who need this level of information.
Intel Desktop Board D915GVWB Technical Product Specification Other Common Notation iv # Used after a signal name to identify an active-low signal (such as USBP0#) (NxnX) When used in the description of a component, N indicates component type, xn are the relative coordinates of its location on the Desktop Board D915GVWB, and X is the instance of the particular part at that general location. For example, J5J1 is a connector, located at 5J. It is the first connector in the 5J area.
Contents 1 Product Description 1.1 1.2 PCI Bus Terminology Change........................................................................................ 9 Overview ...................................................................................................................... 10 1.2.1 Feature Summary.......................................................................................... 10 1.2.2 Manufacturing Options .................................................................................
Intel Desktop Board D915GVWB Technical Product Specification 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.15 DMA Channels ............................................................................................................. 41 Fixed I/O Map............................................................................................................... 42 PCI Configuration Space Map...................................................................................... 43 Interrupts ......
Contents 4 Error Messages and Beep Codes 4.1 4.2 4.3 4.4 4.5 BIOS Error Messages .................................................................................................. 77 Port 80h POST Codes ................................................................................................. 79 Bus Initialization Checkpoints ...................................................................................... 83 Speaker .............................................................................
Intel Desktop Board D915GVWB Technical Product Specification 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. viii Interrupts ...................................................................................................................... 44 PCI Interrupt Routing Map ........................................................................................... 45 Back Panel Connectors Shown in Figure 15.........
1 Product Description What This Chapter Contains 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 PCI Bus Terminology Change........................................................................................ 9 Overview ...................................................................................................................... 10 Online Support ............................................................................................................. 15 Processor .........................
Intel Desktop Board D915GVWB Technical Product Specification 1.2 Overview 1.2.1 Feature Summary Table 1 summarizes the major features of the Desktop Board D915GVWB. Table 1. Feature Summary Form Factor microATX Form Factor (9.60 inches by 9.60 inches [243.84 millimeters by 243.
Product Description Table 1.
Intel Desktop Board D915GVWB Technical Product Specification 1.2.3 Board Layout Figure 1 shows the location of the major components on the Desktop Board D915GVWB. A B CD E F G EE DD H CC BB AA I J K L Z M X Y V W T U S R Q P O N OM17319 Figure 1. Board Components Table 3 lists the components identified in Figure 1.
Product Description Table 3.
Intel Desktop Board D915GVWB Technical Product Specification 1.2.4 Block Diagram Figure 2 is a block diagram of the major functional areas of the board.
Product Description 1.3 Online Support To find information about… Visit this World Wide Web site: Intel Desktop Board D915GVWB under “Desktop Board Products” or “Desktop Board Support” http://www.intel.com/design/motherbd http://support.intel.com/support/motherboards/desktop Available configurations for the Desktop Board D915GVWB http://developer.intel.com/design/motherbd/wb/wb_available.htm Processor data sheets http://www.intel.com/design/litcentr ICH6 addressing http://developer.intel.
Intel Desktop Board D915GVWB Technical Product Specification • • • Non-ECC DIMMs Serial Presence Detect DDR 400 MHz and DDR 333 MHz SDRAM DIMMs Table 4 lists the supported system bus frequency and memory speed combinations. Table 4.
Product Description 1.5.1 Memory Configurations The Intel 82915GV GMCH supports two types of memory organization: • • Dual channel (Interleaved) mode. This mode offers the highest throughput for real world applications. Dual channel mode is enabled when the installed memory capacities of both DIMM channels are equal. Technology and device width can vary from one channel to the other but the installed memory capacity for each channel must be equal.
Intel Desktop Board D915GVWB Technical Product Specification 1.5.1.1 Dual Channel (Interleaved) Mode Configurations Figure 4 shows a dual channel configuration using two DIMMs. In this example, the DIMM0 (blue) sockets of both channels are populated with identical DIMMs. 1 GB Channel A, DIMM 0 Channel A, DIMM 1 1 GB Channel B, DIMM 0 Channel B, DIMM 1 OM17123 Figure 4. Dual Channel (Interleaved) Mode Configuration with Two DIMMs Figure 5 shows a dual channel configuration using three DIMMs.
Product Description Figure 6 shows a dual channel configuration using four DIMMs. In this example, the combined capacity of the two DIMMs in Channel A equal the combined capacity of the two DIMMs in Channel B. Also, the DIMMs are matched between DIMM0 and DIMM1 of both channels. 256 MB 512 MB Channel A, DIMM 0 Channel A, DIMM 1 256 MB 512 MB Channel B, DIMM 0 Channel B, DIMM 1 OM17124 Figure 6.
Intel Desktop Board D915GVWB Technical Product Specification 1.5.1.2 Single Channel (Asymmetric) Mode Configurations NOTE Dual channel (Interleaved) mode configurations provide the highest memory throughput. Figure 7 shows a single channel configuration using one DIMM. In this example, only the DIMM0 (blue) socket of Channel A is populated. Channel B is not populated. 256 MB Channel A, DIMM 0 Channel A, DIMM 1 Channel B, DIMM 0 Channel B, DIMM 1 OM17125 Figure 7.
Product Description 1.6 Intel® 915GV Chipset The Intel 915GV chipset consists of the following devices: • • • Intel 82915GV Graphics Memory Controller Hub (GMCH) with Direct Media Interface (DMI) interconnect Intel 82801FB I/O Controller Hub (ICH6) with DMI interconnect Firmware Hub (FWH) The GMCH is a centralized controller for the system bus, the memory bus, the PCI Express bus, and the DMI interconnect. The ICH6 is a centralized controller for the board’s I/O paths.
Intel Desktop Board D915GVWB Technical Product Specification 1.6.1.1 Dynamic Video Memory Technology (DVMT) DVMT enables enhanced graphics and memory performance through Direct AGP, and highly efficient memory utilization. DVMT ensures the most efficient use of available system memory for maximum 2-D/3-D graphics performance. Up to 224 MB of system memory can be allocated to DVMT on systems that have 512 MB or more of total system memory installed.
Product Description 1.6.3 IDE Support The board provides five IDE interface connectors: • • 1.6.3.1 One parallel ATA IDE connector that supports two devices Four serial ATA IDE connectors that support one device per connector Parallel ATE IDE Interface The ICH6’s Parallel ATA IDE controller has one bus-mastering Parallel ATA IDE interface. The Parallel ATA IDE interface supports the following modes: • • • • • Programmed I/O (PIO): processor controls data transfer.
Intel Desktop Board D915GVWB Technical Product Specification For compatibility, the underlying Serial ATA functionality is transparent to the operating system. The Serial ATA controller can operate in both legacy and native modes. In legacy mode, standard IDE I/O and IRQ resources are assigned (IRQ 14 and 15). In Native mode, standard PCI Conventional bus resource steering is used. Native mode is the preferred mode for configurations using the Windows* XP and Windows 2000 operating systems.
Product Description 1.8 I/O Controller The I/O controller provides the following features: • • • • • • • One serial port One parallel port with Extended Capabilities Port (ECP) and Enhanced Parallel Port (EPP) support Serial IRQ interface compatible with serialized IRQ support for PCI Conventional bus systems PS/2-style mouse and keyboard interfaces Interface for one 1.44 MB or 2.
Intel Desktop Board D915GVWB Technical Product Specification 1.8.4 Keyboard and Mouse Interface PS/2 keyboard and mouse connectors are located on the back panel. NOTE The keyboard is supported in the bottom PS/2 connector and the mouse is supported in the top PS/2 connector. Power to the computer should be turned off before a keyboard or mouse is connected or disconnected. For information about Refer to The location of the keyboard and mouse connectors Figure 15, page 46 1.
Product Description 1.9.3 Intel® High Definition Audio Subsystem The Intel High Definition Audio subsystem includes the following: • • • Intel 82801FB I/O Controller Hub (ICH6) Realtek ALC860 audio codec Microphone input that supports a single dynamic, condenser, or electret microphone The front and back audio connectors are configurable through the audio device drivers. The available configurable audio ports are shown in Figure 9.
Intel Desktop Board D915GVWB Technical Product Specification 1.
Product Description 1.10.
Intel Desktop Board D915GVWB Technical Product Specification • • • • Two remote thermal diode sensors for direct monitoring of processor temperature and ambient temperature sensing Power supply monitoring of five voltages (+5 V, +12 V, +3.3 VSB, +1.
Product Description 1.11.3 Fan Monitoring Fan monitoring can be implemented using Intel® Desktop Utilities, LANDesk* software, or thirdparty software. The level of monitoring and control is dependent on the hardware monitoring ASIC used with the Desktop Board. For information about Refer to The functions of the fan connectors Section 1.12.2.2, page 35 1.11.
Intel Desktop Board D915GVWB Technical Product Specification 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 this board requires an operating system that provides full ACPI support.
Product Description Table 8. Power States and Targeted System Power Device States Targeted System Power (Note 1) C0 – working D0 – working state. Full power > 30 W S1 – Processor stopped C1 – stop grant D1, D2, D3 – device specification specific. 5 W < power < 52.5 W G1 – sleeping state S3 – Suspend to RAM. Context saved to RAM. No power D3 – no power except for wake-up logic. Power < 5 W (Note 2) G1 – sleeping state S4 – Suspend to disk. Context saved to disk.
Intel Desktop Board D915GVWB Technical Product Specification 1.12.2 Hardware Support CAUTION Ensure that the power supply provides adequate +5 V standby current if LAN wake capabilities and Instantly Available PC technology features are used. Failure to do so can damage the power supply. The total amount of standby current required depends on the wake devices supported and manufacturing options.
Product Description 1.12.2.2 Fan Connectors The function/operation of the fan connectors is as follows: • • • • • The fans are on when the board is in the S0 or S1 state. The fans are off when the board is off or in the S3, S4, or S5 state. Each fan connector is wired to a fan tachometer input of the hardware monitoring and fan control ASIC. All fan connectors support closed-loop fan control that can adjust the fan speed or switch the fan on or off as needed.
Intel Desktop Board D915GVWB Technical Product Specification The board supports the PCI Bus Power Management Interface Specification. Add-in boards that also support this specification can participate in power management and can be used to wake the computer. The use of Instantly Available PC technology requires operating system support and PCI 2.2 compliant add-in cards, PCI Express add-in cards, and drivers. 1.12.2.
Product Description CR3J1 OM17323 Figure 13.
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2 Technical Reference What This Chapter Contains 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.10 2.11 2.12 2.13 2.14 2.15 Introduction .................................................................................................................. 39 Memory Resources ...................................................................................................... 39 DMA Channels ............................................................................................................. 41 Fixed I/O Map...
Intel Desktop Board D915GVWB Technical Product Specification The amount of installed memory that can be used will vary based on add-in cards and BIOS settings. Figure 14 shows a schematic of the system memory map. All installed system memory can be used when there is no overlap of system addresses.
Technical Reference 2.2.2 Memory Map Table 10 lists the system memory map. Table 10. System Memory Map Address Range (decimal) Address Range (hex) Size Description 1024 K - 4194304 K 100000 - FFFFFFFF 4095 MB Extended memory 960 K - 1024 K F0000 - FFFFF 64 KB Runtime BIOS 896 K - 960 K E0000 - EFFFF 64 KB Reserved 800 K - 896 K C8000 - DFFFF 96 KB Potential available high DOS memory (open to the PCI Conventional bus). Dependent on video adapter used.
Intel Desktop Board D915GVWB Technical Product Specification 2.4 Fixed I/O Map Table 12. I/O Map Address (hex) Size Description 0000 - 00FF 256 bytes 0170 - 0177 01F0 - 01F7 8 bytes 8 bytes Used by the Desktop Board D915GVWB. Refer to the ICH6 data sheet for dynamic addressing information.
Technical Reference 2.5 PCI Configuration Space Map Table 13.
Intel Desktop Board D915GVWB Technical Product Specification 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 ICH6 component. The PIC is supported in Windows 98 SE and Windows ME and uses the first 16 interrupts. The APIC is supported in Windows 2000 and Windows XP and supports a total of 24 interrupts. Table 14.
Technical Reference 2.7 PCI Conventional Interrupt Routing Map This section describes interrupt sharing and how the interrupt signals are connected between the PCI Conventional bus connectors and onboard PCI Conventional devices. The PCI Conventional specification describes how interrupts can be shared between devices attached to the PCI Conventional bus. In most cases, the small amount of latency added by interrupt sharing does not affect the operation or throughput of the devices.
Intel Desktop Board D915GVWB Technical Product Specification 2.8 Connectors CAUTION Only the following connectors have overcurrent protection: back panel USB, front panel USB, and PS/2. The other internal connectors are not overcurrent protected and should connect only to devices inside the computer’s chassis, such as fans and internal peripherals. Do not use these connectors to power devices external to the computer’s chassis.
Technical Reference NOTE The back panel audio line out connector is designed to power headphones or amplified speakers only. Poor audio quality occurs if passive (non-amplified) speakers are connected to this output. Table 16.
Intel Desktop Board D915GVWB Technical Product Specification 2.8.2 Component-side Connectors Figure 16 shows the locations of the component-side connectors. A C E B 1 2 9 10 F D 4 3 3 1 3 1 V 2 1 1 1 1 1 10 9 2 1 1 10 1 U 2 2 3 1 1 10 4 1 T 1 G 2 10 1 S 24 R 2 23 40 2 2 1 34 1 33 39 1 Q O P M N K J I H L OM17324 Figure 16. Component-side Connectors Table 17 lists the component-side connectors identified in Figure 16.
Technical Reference Table 17.
Intel Desktop Board D915GVWB Technical Product Specification Table 19. Front Chassis Fan and Rear Chassis Fan Connectors Pin Signal Name 1 Control 2 +12 V 3 Tach Table 20. Processor Fan Connector Pin Signal Name 1 Ground 2 +12 V 3 FAN_TACH 4 FAN_CONTROL Table 21. Chassis Intrusion Connector Pin Signal Name 1 Intruder 2 Ground Table 22. Serial ATA Connectors Pin Signal Name 1 Ground 2 TXP 3 TXN 4 Ground 5 RXN 6 RXP 7 Ground 2.8.2.
Technical Reference Table 23. Main Power Connector Pin Signal Name Pin Signal Name 1 +3.3 V 13 +3.3 V 2 +3.
Intel Desktop Board D915GVWB Technical Product Specification 2.8.2.3 Auxiliary Front Panel Power/Sleep LED Connector Pins 1 and 3 of this connector duplicate the signals on pins 2 and 4 of the front panel connector. Table 25. Auxiliary Front Panel Power/Sleep LED Connector Pin Signal Name In/Out Description 1 HDR_BLNK_GRN Out Front panel green LED 2 Not connected 3 HDR_BLNK_YEL Out Front panel yellow LED 2.8.2.
Technical Reference 2.8.2.4.1 Hard Drive Activity LED Connector [Yellow] Pins 1 and 3 [Yellow] can be connected to an LED to provide a visual indicator that data is being read from or written to a hard drive. Proper LED function requires one of the following: • • 2.8.2.4.
Intel Desktop Board D915GVWB Technical Product Specification 2.8.2.5 Front Panel USB Connectors Figure 18 is a connection diagram for the front panel USB connectors. # INTEGRATOR’S NOTES • • • • The +5 V DC power on the USB connector is fused. Pins 1, 3, 5, and 7 comprise one USB port. Pins 2, 4, 6, and 8 comprise one USB port. Use only a front panel USB connector that conforms to the USB 2.0 specification for highspeed USB devices.
Technical Reference 2.9 Jumper Block CAUTION Do not move the jumper with the power on. Always turn off the power and unplug the power cord from the computer before changing a jumper setting. Otherwise, the board could be damaged. Figure 20 shows the location of the jumper block. The 3-pin jumper block determines the BIOS Setup program’s mode. Table 29 describes the jumper settings for the three modes: normal, configure, and recovery.
Intel Desktop Board D915GVWB Technical Product Specification 2.10 Mechanical Considerations 2.10.1 Form Factor The board is designed to fit into either a microATX or an ATX-form-factor chassis. Figure 21 illustrates the mechanical form factor of the board. Dimensions are given in inches [millimeters]. The outer dimensions are 9.60 inches by 9.60 inches [243.84 millimeters by 243.84 millimeters]. Location of the I/O connectors and mounting holes are in compliance with the ATX specification. 1.800 [45.
Technical Reference 2.10.2 I/O Shield The back panel I/O shield for the board must meet specific dimension and material requirements. Systems based on this board needs the back panel I/O shield to pass certification testing. Figure 22 shows the I/O shield. Dimensions are given in inches to a tolerance of ±0.02 inches. The figure also indicates the position of each cutout. Additional design considerations for I/O shields relative to chassis requirements are described in the ATX specification.
Intel Desktop Board D915GVWB Technical Product Specification 2.11 Electrical Considerations 2.11.1 DC Loading Table 30 lists the DC loading characteristics of the board. This data is based on a DC analysis of all active components within the board that impact its power delivery subsystems. The analysis does not include PCI add-in cards. Minimum values assume a light load placed on the board that is similar to an environment with no applications running and no USB current draw.
Technical Reference 2.11.4 Power Supply Considerations CAUTION The +5 V standby line for the power supply must be capable of providing adequate +5 V standby current. Failure to do so can damage the power supply. The total amount of standby current required depends on the wake devices supported and manufacturing options. System integrators should refer to the power usage values listed in Table 30 when selecting a power supply for use with the board.
Intel Desktop Board D915GVWB Technical Product Specification 2.12 Thermal Considerations CAUTION A chassis with a maximum internal ambient temperature of 38 oC at the processor fan inlet is a requirement. Use a processor heatsink that provides omni-directional airflow (as shown in Figure 23) to maintain required airflow across the processor voltage regulator area. OM16996 Figure 23.
Technical Reference CAUTION Ensure that proper airflow is maintained in the processor voltage regulator circuit. Failure to do so may result in damage to the voltage regulator circuit. The processor voltage regulator area (item A in Figure 24) can reach a temperature of up to 85 oC in an open chassis. Figure 24 shows the locations of the localized high temperature zones.
Intel Desktop Board D915GVWB Technical Product Specification Table 32 provides maximum case temperatures for the Desktop Board D915GVWB components that are sensitive to thermal changes. The operating temperature, current load, or operating frequency could affect case temperatures. Maximum case temperatures are important when considering proper airflow to cool the Desktop Board D915GVWB. Table 32.
Technical Reference 2.14 Environmental Table 33 lists the environmental specifications for the board. Table 33.
Intel Desktop Board D915GVWB Technical Product Specification 2.15 Regulatory Compliance This section describes the Desktop Board’s compliance with U.S. and international safety and electromagnetic compatibility (EMC) regulations. 2.15.1 Safety Regulations Table 34 lists the safety regulations the Desktop Board D915GVWB complies with when correctly installed in a compatible host system. Table 34.
Technical Reference 2.15.2.1 FCC Compliance Statement (USA) Product Type: D915GVWB Desktop Board This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
Intel Desktop Board D915GVWB Technical Product Specification Suomi Tämä tuote noudattaa EU-direktiivin 89/336/EEC & 73/23/EEC määräyksiä. Français Ce produit est conforme aux exigences de la Directive Européenne 89/336/EEC & 73/23/EEC. Deutsch Dieses Produkt entspricht den Bestimmungen der Europäischen Richtlinie 89/336/EEC & 73/23/EEC. Icelandic Þessi vara stenst reglugerð Evrópska Efnahags Bandalagsins númer 89/336/ EEC & 73/23/EEC.
Technical Reference 2.15.5 Product Certification Markings (Board Level) Table 36 lists the board’s product certification markings. Table 36. Product Certification Markings Description Marking UL joint US/Canada Recognized Component mark. Includes adjacent UL file number for Intel Desktop Boards: E210882 (component side). FCC Declaration of Conformity logo mark for Class B equipment; includes Intel name and D915GVWB model designation (component side). CE mark.
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3 Overview of BIOS Features What This Chapter Contains 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 Introduction .................................................................................................................. 69 BIOS Flash Memory Organization ............................................................................... 70 Resource Configuration ............................................................................................... 70 System Management BIOS (SMBIOS) .....................
Intel Desktop Board D915GVWB Technical Product Specification Table 37 lists the BIOS Setup program menu features. Table 37.
Overview of BIOS Features to PIO Mode 3 or 4, depending on the capability of the drive. You can override the autoconfiguration options by specifying manual configuration in the BIOS Setup program. To use ATA-66/100 features the following items are required: • • • An ATA-66/100 peripheral device An ATA-66/100 compatible cable ATA-66/100 operating system device drivers NOTE Do not connect an ATA device as a slave on the same IDE cable as an ATAPI master device.
Intel Desktop Board D915GVWB Technical Product Specification 5. The operating system loads. While the operating system is loading, USB keyboards and mice are recognized and may be used to configure the operating system. (Keyboards and mice are not recognized during this period if Legacy USB support was set to Disabled in the BIOS Setup program.) 6.
Overview of BIOS Features 3.7 Boot Options In the BIOS Setup program, the user can choose to boot from a diskette drive, hard drives, CD-ROM, or the network. The default setting is for the diskette drive to be the first boot device, the hard drive second, and the ATAPI CD-ROM third. The fourth device is disabled. 3.7.1 CD-ROM Boot Booting from CD-ROM is supported in compliance to the El Torito bootable CD-ROM format specification.
Intel Desktop Board D915GVWB Technical Product Specification 3.8 Fast Booting Systems with Intel® Rapid BIOS Boot These factors affect system boot speed: • • 3.8.1 Selecting and configuring peripherals properly Using an optimized BIOS, such as the Intel® Rapid BIOS Peripheral Selection and Configuration The following techniques help improve system boot speed: • • • • 3.8.
Overview of BIOS Features 3.9 BIOS Security Features The BIOS includes security features that restrict access to the BIOS Setup program and who can boot the computer. A supervisor password and a user password can be set for the BIOS Setup program and for booting the computer, with the following restrictions: • • • • • • • The supervisor password gives unrestricted access to view and change all the Setup options in the BIOS Setup program. This is the supervisor mode.
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4 Error Messages and Beep Codes What This Chapter Contains 4.1 4.2 4.3 4.4 4.5 BIOS Error Messages .................................................................................................. 77 Port 80h POST Codes ................................................................................................. 79 Bus Initialization Checkpoints ...................................................................................... 83 Speaker ............................................................
Intel Desktop Board D915GVWB Technical Product Specification Table 41. BIOS Error Messages (continued) Error Message Explanation Update OK! NVRAM was invalid and has been updated. Updated Failed NVRAM was invalid but was unable to be updated. Keyboard Error Error in the keyboard connection. Make sure keyboard is connected properly. KB/Interface Error Keyboard interface test failed. Memory Size Decreased Memory size has decreased since the last boot.
Error Messages and Beep Codes 4.2 Port 80h POST Codes During the POST, the BIOS generates diagnostic progress codes (POST-codes) to I/O port 80h. If the POST fails, execution stops and the last POST code generated is left at port 80h. This code is useful for determining the point where an error occurred. Displaying the POST-codes requires a PCI bus add-in card, often called a POST card. The POST card can decode the port and display the contents on a medium such as a seven-segment display.
Intel Desktop Board D915GVWB Technical Product Specification Table 44. Runtime Code Uncompressed in F000 Shadow RAM Code Description of POST Operation 03 NMI is Disabled. To check soft reset/power-on. 05 BIOS stack set. Going to disable cache if any. 06 POST code to be uncompressed. 07 CPU init and CPU data area init to be done. 08 CMOS checksum calculation to be done next. 0B Any initialization before keyboard BAT to be done next. 0C KB controller I/B free.
Error Messages and Beep Codes Table 44. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation 40 To prepare the descriptor tables. 42 To enter in virtual mode for memory test. 43 To enable interrupts for diagnostics mode. 44 To initialize data to check memory wrap around at 0:0. 45 Data initialized. Going to check for memory wrap around at 0:0 and finding the total system memory size. 46 Memory wrap around test done. Memory size calculation over.
Intel Desktop Board D915GVWB Technical Product Specification Table 44. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation 84 Lock-key checking over. To check for memory size mismatch with CMOS. 85 Memory size check done. To display soft error and check for password or bypass setup. 86 Password checked. About to do programming before setup. 87 Programming before setup complete. To uncompress SETUP code and execute CMOS setup.
Error Messages and Beep Codes Table 44. Runtime Code Uncompressed in F000 Shadow RAM (continued) Code Description of POST Operation AE Uncompress SMBIOS module and init SMBIOS code and form the runtime SMBIOS image in shadow. B1 Going to copy any code to specific area. 00 Copying of code to specific area done. Going to give control to INT-19 boot loader. 4.3 Bus Initialization Checkpoints The system BIOS gives control to the different buses at several checkpoints to do various tasks.
Intel Desktop Board D915GVWB Technical Product Specification Table 47 describes the lower nibble of the high byte and indicates the bus on which the routines are being executed. Table 47. Lower Nibble High Byte Functions Value Description 0 Generic DIM (Device Initialization Manager) 1 On-board System devices 2 ISA devices 3 EISA devices 4 ISA PnP devices 5 PCI devices 4.4 Speaker A 47 Ω inductive speaker is mounted on the board.
