AMI
®
BIOS Setup
3-21
Clear NVRAM
The ESCD (Extended System Configuration Data) NVRAM (Non-volatile
Random Access Memory) is where the BIOS stores resource information for
both PNP and non-PNP devices in a bit string format. When the item is set
to
Yes
, the system will reset ESCD NVRAM right after the system is booted
up and then set the setting of the item back to
No
automatically. The default
value is
No
.
Primary Graphics Adapter
This item specifies which VGA card is your primary graphics adapter.
Settings are
AGP
and
PCI
. The default value is
PCI
.
DMA Channel 0/1/3/5/6/7
These items specify the bus that the system DMA (Direct Memory Access)
channel is used.
The settings determine if AMIBIOS should remove a DMA from the avail-
able DMAs passed to devices that are configurable by the system BIOS.
The available DMA pool is determined by reading the ESCD NVRAM. If
more DMAs must be removed from the pool, the end user can reserve the
DMA by assigning an
ISA/EISA
setting to it. The default value is
PnP
.
IRQ 3/4/5/7/9/10/11/14/15
These items specify the bus where the specified IRQ line is used.
The settings determine if AMIBIOS should remove an IRQ from the pool of
available IRQs passed to devices that are configurable by the system BIOS.
The available IRQ pool is determined by reading the ESCD NVRAM. If more
IRQs must be removed from the IRQ pool, the end user can use these
settings to reserve the IRQ by assigning an
ISA/EISA
setting to it. Onboard
I/O is configured by AMIBIOS. All IRQs used by onboard I/O are
configured as
PCI/PnP
. If all IRQs are set to ISA/EISA, and IRQ 14/15 are
allocated to the onboard PCI IDE, IRQ 9 will still be available for PCI and PnP
devices. Available settings are
ISA/EISA
and
PCI/PnP
. The default value is
PCI/PnP
.
