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Appendix E: BIOS
CPU Configuration
E-8 8580/8590 Vehicle-Mount Computer User Manual
E.5.4 CPU Configuration
E.5.5 Chipset Configuration Sub-Menu
Feature Options Description
Processor Info
Block
No option
Displays the processor manufacturer, brand, fre-
quency, and cache sizes.
On Demand Clock
Modulation
Disable
Allows a reduction of the performance of the
processor by utilizing clock modulation. The
value indicates the CLOCK ON to CLOCK
OFF interval ratio. E.g. 75% results in a perfor-
mance decrease of about 25%.
Note: This option is only available for Celeron
M CPUs.
Feature Options Description
Memory Hole
Disabled
15MB-16MB
Enable or disable the memory hole between
15MB and 16MB. If enabled, accesses to this
range are forwarded to the LPC/PCI bus.
IOAPIC
Disabled
Enabled
Enable/Disable ICH6M IOAPIC function.
APIC ACPI SCI
IRQ
Disabled
Enabled
If set to disabled, IRQ9 is used for the SCI.
If set to enabled, IRQ20 is used for the SCI.
C4 On C3
Disabled
Enabled
If enabled, the CPU is put to C4 state, when the
ACPI OS initiates a transition to C3, for addi-
tional power saving at “Desktop Idle Mode”.
Active State
Power Manage-
ment
Disabled
Enabled
Enable or disable PCI Express L0 and L1 link
power states.
PCI Express Port 1
Enabled
Disabled