Copyright
©
2017
congatec
AG
QA50m10
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Note
congatec does not offer virtual machine monitor (VMM) software. All VMM software support questions and queries should be directed to the
VMM software vendor and not congatec technical support.
7.1.1.2
AHCI
The Apollo Lake SoC provides hardware support for Advanced Host Controller Interface (AHCI), a programming interface for SATA host
controllers. Platforms supporting AHCI may take advantage of performance features such as no master/slave designation for SATA devices (each
device is treated as a master) and hardware-assisted native command queuing. AHCI also provides usability enhancements such as Hot-Plug.
7.1.1.3
Thermal Management
ACPI is responsible for allowing the operating system to play an important part in the system’s thermal management. This results in the
operating system having the ability to take control of the operating environment by implementing cooling decisions according to the demands
put on the CPU by the application.
The conga-QA5 ACPI thermal solution offers two different cooling policies.
•
Passive Cooling
When the temperature in the thermal zone must be reduced, the operating system can decrease the power consumption of the processor by
throttling the processor clock. One of the advantages of this cooling policy is that passive cooling devices (in this case the processor) do not
produce any noise. Use the “passive cooling trip point” setup node in the BIOS setup program to determine the temperature threshold that
the operating system will use to start or stop the passive cooling procedure.
•
Critical Trip Point
If the temperature in the thermal zone reaches a critical point then the operating system will perform a system shut down in an orderly fashion
in order to ensure that there is no damage done to the system as result of high temperatures. Use the “critical trip point” setup node in the
BIOS setup program to determine the temperature threshold that the operating system will use to shut down the system.
Note
The end user must determine the cooling preferences for the system by using the setup nodes in the BIOS setup program to establish the
appropriate trip points.
If passive cooling is activated and the processor temperature is above the trip point the processor clock is throttled. See section 12 of the
ACPI Specification 2.0 C for more information about passive cooling.
