Acorp 7KT266A User Manual page 59

Chapter 2 Chapter 2
Chapter 2 Chapter 2 Chapter 2
PCI / VGA Palette Snoop
Choose Disabled or Enabled. Some graphic controllers
which are not VGA compatible take the output from a VGA
controller and map it to their display as a way to provide
boot information and VGA compatibility.
However, the color information coming from the VGA
controller is drawn from the palette table inside the VGA
controller to generate the proper colors, and the graphic
controller needs to know what is in the palette of the VGA
controller. To do this, the non-VGA graphic controller
watches for the write access to the VGA palette and
registers the snoop data. In PCI based systems, the Write
Access to the palette will not show up on the ISA bus if the
PCI VGA controller responds to the Write.
In this case, the PCI VGA controller should not respond to
the Write, it should only snoop the data and permit the
access to be forwarded to the ISA bus. The non-VGA ISA
graphic controller can then snoop the data on the ISA bus.
Unless you have the above situation, you should disable
this option.
Disabled (default)
Enabled
Assign IRQ For VGA
Lets the user choose which IRQ to assign for the VGA.
Assign IRQ For USB
Lets the user choose which IRQ to assign for the USB.
Function Disabled.
Function Enabled.
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