PCI IDE Controller: Difference between revisions
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== Detecting a PCI IDE Controller ==
Each IDE controller appears as a device on the [[PCI]] bus and can be identified by reading the configuration space. If the class code is 0x01 (Mass Storage Controller) and the subclass code is 0x01 (IDE), the device is an IDE controller. The programming interface byte(Prog If) determines how you'll access it.
* Bit 0: When set, the primary channel is in PCI native mode. When clear, the primary channel is in compatibility mode (ports 0x1F0-0x1F7, 0x3F6, IRQ14).
* Bit 1: When set, you can modify bit 0 to switch between PCI native and compatibility mode. When clear, you cannot modify bit 0.
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