Intel 815 Manuel D’Utilisation
Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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2.3.1.2. System
Startup
The Intel
®
815 chipset has multiple possible device modes. The selection of which mode will be auto-
detected is represented in the following flow chart. The software requirements for implementing this high
level flow are detailed in the next section.
level flow are detailed in the next section.
Multi-monitor configurations are not addressed, as that is a function of the operating system when
supported. System BIOS also provides the ability to select any of the display devices as the primary
display device.
supported. System BIOS also provides the ability to select any of the display devices as the primary
display device.
Figure 4.
Device Mode Auto-Detect Flowchart
System Reset
AGP Card
Detected?
Detected?
Yes
No
Mode 1
(AGP Card)
DEV#0, REG53H, Bit1=0
Display Cache
(GPA Card)
Detected?
Yes
No
Mode 2
(Internal Graphics with
Display Cache on GPA
Card)
DEV#0, REG53H, BIT1=1
Mode 3
(Internal Graphics with
Shared Memory)
DEV#0, REG53H, BIT1=1
REG70H, BIT7:6=11 or 10
No
Memory and Basic
chipset Initialization