Intel D865GLC Manual - Page 54

BIOS Flash Memory Organisation The Intel Firmware Hub (FWH) includes a 4 Mbit (512 KB) symmetrical flash memory device. Internally, the device is grouped into eight 64-KB blocks that are individually erasable, lockable, and unlockable. The Intel 28F002 2-Mbit flash component is organised as 256 KB x 8 bits and is divided into areas as described in Table 17. The table shows the addresses in the ROM image in normal mode (the addresses change in BIOS Recovery Mode). Table 17: Typical Flash Memory Organisation Address (Hex) Size Description FFFFC000 - FFFFFFFF 16 KB Boot Block FFFFA000 - FFFFBFFF 8 KB Vital Product Data (VPD) Extended System Configuration Data (ESCD) (DMI configuration data / Plug and Play data) FFFF9000 - FFFF9FFF 4 KB Used by BIOS (e.g., for Event Logging) FFFF8000 - FFFF8FFF 4 KB OEM logo or Scan Flash Area FFFC0000 - FFFF7FFF 228 KB Main BIOS Block Plug and Play: PCI Auto-configuration The BIOS automatically configures PCI devices and Plug and Play devices. PCI devices may be onboard or add-in cards. Plug and Play devices are ISA add-in cards built to meet the Plug and Play specification. Auto-configuration lets a user insert or remove PCI or Plug and Play cards without having to configure the system. When a user turns on the system after adding a PCI or Plug and Play card, the BIOS automatically configures interrupts, the I/O space, and other system resources. Any interrupts set to Available in Setup are considered to be available for use by the addin card. PCI interrupts are distributed to available ISA interrupts that have not been assigned to an ISA card or to system resources. The assignment of PCI interrupts to ISA IRQs is non-deterministic. PCI devices can share an interrupt, but an ISA device cannot share an interrupt allocated to PCI or to another ISA device. Autoconfiguration information is stored in the extended system configuration data (ESCD) format. PCI IDE Support If Auto is selected as a primary or secondary IDE in Setup, the BIOS automatically sets up the two local-bus IDE connectors with independent I/O channel support. The IDE interface supports hard drives up to PIO Mode 4 and recognises any ATAPI devices, including CD-ROM drives, tape drives and Ultra DMA drives. Add-in ISA IDE controllers are not supported. The BIOS determines the capabilities of each drive and configures them so as to optimise capacity and performance. To take advantage of the high-capacity storage devices, hard drives are automatically configured for logical block addressing (LBA) and to PIO Mode 3 or 4, depending on the capability of the drive. To override the auto-configuration options, use the D865GLC Motherboard Manual 53