Kontron CPCI-MXS Technical Reference Manual page 89

cPCI-MXS64 Technical Reference Manual
Chipset Features Setup (Continued)
BIOS Setup
Option
Defaults Defaults
PCI/VGA Palette Dis. Dis.
Snoop
Passive Release En. En.
Delayed Transaction Dis. Dis.
Supervisor I/O Base 190h 190h
Address
Power-Supply Type AT AT
AGP Aperture Size 64
(MB)
Video BIOS Shadow En. En.
C8000-CBFFF En. En.
CC000-CFFFF En. En.
D0000-D3FFF En. En.
D4000-D7FFF En. En.
D8000-DBFFF En. En.
DC000-DFFFF En. En.
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Possible
Settings
En./Dis. Palette snooping allows multiple VGA devices operating on
different buses to handle data from the CPU on each set of palette
registers.
When set to Enabled, data read and written by the CPU is
directed to both the PCI VGA device's palette registers and the
ISA VGA device's palette registers, permitting the palette registers
of both to be identical.
When set to Disabled, data read and written by the CPU is only
directed to the PCI VGA device's palette registers.
When Enabled, CPU to PCI bus accesses are allowed during passive
En./Dis.
release otherwise the arbiter only accepts another PCI master access
to local SDRAM.
En./Dis. The chipset has an embedded 32-bit posted write buffer to support
delay transactions cycles. Select Enabled to support compliance with
PCI specifications version 2.1.
190h, 290h, This option determines the base address for the Supervisor I/O
390h Register, which is used for such functions as power fail detection
and the watchdog timer.
AT, ATX This option selects the type of power supply.
64 4 to 256 This option selects the size in megabytes of the AGP Aperture.
En./Dis. Software that resides in a read-only memory (ROM) chip on a
device is called firmware. Award permits shadowing of firmware
En./Dis.
such as the system BIOS, video BIOS, and similar operating
En./Dis.
instructions that come with some expansion peripherals.
En./Dis.
En./Dis. Shadowing copies from ROM into system RAM, where the CPU
can read it through the 64-bit DRAM bus. Firmware not shadowed
En./Dis.
must be read by the system through the 8 or 16-bit ISA bus.
En./Dis.
Shadowing improves the performance of the system BIOS and
similar firmware for expansion peripherals.
Enable shadowing into each section of memory separately. Many
system designers hardwire shadowing of the system BIOS and
eliminate a System BIOS Shadow option. Note that on a PCI VGA
card (on board or off-board), the VGA BIOS is always shadowed.
Video BIOS shadows into memory area C0000 plus the VGA
BIOS size. The remaining areas between C0000 and DFFFF
shown on the BIOS Features Setup screen may be occupied by
other expansion card firmware. If an expansion peripheral in your
system contains ROM-based firmware, you need to know the
address range the ROM occupies to shadow it into the correct
area of RAM.
4-9
Description