Kontron EPIC/CE, Руководство пользователя

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22 Important Technology Information
Kontron User's Guide EPIC/CE 61
More interrupts
The I/O APIC in the chipset of the EPIC/CE supports a total of 24 interrupts.
22.3 Native vs. Compatible IDE mode
22.3.1 Compatible IDE Mode
The ATA controller emulates a legacy IDE controller, which is a non-standard extension of the ISA-based
IDE controller. In compatible mode, the controller requires two ISA IRQs (14 and 15) that cannot be
shared with other devices.
22.3.2 Native Mode
The ATA controller acts as a true PCI device that does not require dedicated legacy resources and can be
configured anywhere in the system. ATA controllers running in native mode use their PCI interrupt for
both channels and can share this interrupt pin with other devices in the system, like any other PCI
device.
By requiring only one shareable interrupt instead of two non-shareable ones, native-mode controllers
significantly decrease the likelihood that a user will install a device that cannot work because no
interrupts are available.
Enable Native IDE Support in the BIOS Setup Utility if your OS supports this mode.
Notes
: The Native Mode is not supported by all operating systems. The Native mode must be enabled in the BIOS
setup before the OS installation. Native Mode only works in ACPI mode.
For more information see: Microsoft Windows platform design notes about Native-mode ATA.
22.3.3 Native Mode Configuration
Windows XP SP1 and Windows Server 2003 switch a native-mode-capable ATA controller from compatible
to native mode if the BIOS indicates that the controller can be switched, the controller supports native
mode, and the appropriate registry entry is set.
You must add a DWORD VALUE called EnableNativeModeATA under
HKEY_LOCAL_MACHINE/System/CurrentControlSet/Control/PnP/PCI/
and set 1 as the value.