Essential Linux Device Drivers
The Companion website
Probably the most wide ranging and complete Linux device driver book I've read.
-- Alan Cox, Linux Guru and Key Kernel Developer
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Very comprehensive and detailed, covering almost every single Linux device driver type.
-- Theodore Ts'o, First Linux Kernel Developer in North America and Chief Platform Strategist at the Linux Foundation
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Essential Linux Device Drivers is prescribed for course work in several schools such as the University of Texas at Austin (Course title: Advanced Embedded Systems Architecture), Columbia University (Course title: Network Systems Design and Implementation), the University of Albany at New York (Course title: Operating Systems), and Portland State University (Course title: Operating System Internals).
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A book review appeared in the August 2008 issue of the Linux For You magazine.