Viglen D865GLC - Desktop Board Motherboard 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)
FFFFC000 – FFFFFFFF
FFFFA000 – FFFFBFFF
FFFF9000 - FFFF9FFF
FFFF8000 - FFFF8FFF
FFFC0000 - FFFF7FFF
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 add-
in 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.
configuration 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.
Size Description
16 KB Boot Block
8 KB Vital Product Data (VPD) Extended System
Configuration Data (ESCD) (DMI configuration data
/ Plug and Play data)
4 KB Used by BIOS (e.g., for Event Logging)
4 KB OEM logo or Scan Flash Area
228 KB Main BIOS Block
To override the auto-configuration options, use the
D865GLC Motherboard Manual
Auto-
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