Changed links from KPI Reference to Kernel Framework Reference.

Made minor corrections.

Updated information on building a universal I/O Kit device driver.

Added information on debugging on an Intel-based Macintosh and noted that KUNC APIs are unavailable to KEXTs that depend on KPIs.

Made minor corrections.

Made minor corrections.

Clarified the location of the AppleGMACEthernet driver source code.

Made minor corrections.

Made minor bug fixes.

Added a chapter on creating a universal binary version of an I/O Kit device driver.

Made minor bug fix. Changed title from "Writing an I/O Kit Device Driver".

Added description of new way to break into kernel debugging mode in OS X v. 10.4.

Fixed typos. Reorganized Introduction chapter and added note that Objective-C does not supply I/O Kit interfaces.

Changed outdated links, removed references to OSMetaClass::failModLoad() method.

Added information about changes in memory subsystem to support 64-bit architectures. Added a link to the AppleGMACEthernet driver source code.

Added definition of kAny constant in code listing 4-20, corrected property-key name device_type to device-type, added description of the default implementation of newUserClient method.

Added note that a symboled kernel is required for the kernel debugging macros to work. Added link to Kernel Debug Kit.

First publication.