Intel 815 Manuel D’Utilisation
Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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5.
Basic Initialization Procedures
5.1. Initialization
Sequence
The initialization of graphics driver resources can be broken down into three categories: hardware
detection, frame buffer initialization, and hardware register initialization. Each category is discussed in
more detail in the following sections.
detection, frame buffer initialization, and hardware register initialization. Each category is discussed in
more detail in the following sections.
In all discussions that follow, there is a basic assumption that the graphics adapter has completed the
power-on video BIOS initialization or video BIOS reset. Therefore, the adapter is in a known state and
will respond in compliance with the VGA and VESA specifications.
power-on video BIOS initialization or video BIOS reset. Therefore, the adapter is in a known state and
will respond in compliance with the VGA and VESA specifications.
5.2.
Hardware Detection (Probe)
Most operating systems will probe for installed devices. The Intel 8281x family of devices advertise their
presence in PCI space by using unique values in the PCI VendorId and DeviceId locations. The
following table lists the device IDs used to identify the members of the 8281x family of graphics
adapters.
presence in PCI space by using unique values in the PCI VendorId and DeviceId locations. The
following table lists the device IDs used to identify the members of the 8281x family of graphics
adapters.
Vendor Id
PCI Offset: 0
Device Id
PCI Offset: 2
PCI Device
Number
Characteristics
8086 7120 0
Intel
®
82810 chipset bridge
8086 7121 1
Intel
®
82810 chipset
8086 7122 0
Intel
®
82810 chipset DC100 bridge
8086 7123 1
Intel
®
82810 chipset DC100
8086 7124 0
Intel
®
82810E chipset bridge
8086 7125 1
Intel
®
82810E chipset
8086 1100 0
Intel
®
82815 chipset GMCH host-hub interface bridge /
DRAM controller FSB limited to 100 MHz
8086 1101 1
Intel
®
82815 chipset FSB limited to 100 MHz; AGP bridge
8086 1102 2
Intel
®
82815 chipset FSB limited to 100 MHz; Internal graphics
device
8086 1110 0
Intel
®
82815 chipset no AGP, internal graphics only; GMCH host-
hub interface bridge / DRAM controller
8086 1112 2
Intel
®
82815 chipset no AGP, internal graphics only; Internal
graphics device
8086 1120 0
Intel
®
82815 chipset no internal graphics, AGP only; GMCH host-
hub interface bridge / DRAM controller
8086
1121
1
No internal graphics, AGP only; AGP bridge
8086 1130 0
Intel
®
82815 chipset fully featured; GMCH host-hub interface
bridge / DRAM controller
8086 1131 1
Intel
®
82815 chipset fully featured; AGP bridge
8086 1132 2
Intel
®
82815 chipset fully featured; Internal graphics device