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devicetree: kernel internals and
practical troubleshooting
There have been many presentations on what a devicetree
looks like and how to create a devicetree. This talk instead
examines how the Linux kernel uses a devicetree. Topics
include the kernel devicetree framework, device creation,
resource allocation, driver binding, and connecting objects.
Troubleshooting will consider initialization, allocation, and
binding ordering; kernel configuration; and driver problems.
Frank Rowand, Sony Mobile Communications August 22, 2014
140821_1927
CAUTION
The material covered in this presentation is
kernel version specific
Most information describes 3.16 or earlier
In cases where arch specific code is involved,
there will be a bias to looking at arch/arm/
Chapter 1
Device tree
what is device tree?
“A device tree is a tree data structure with nodes
that describe the devices in a system. Each node
has property/value pairs that describe the
characteristics of the device being represented.
Each node has exactly one parent except for the
root node, which has no parent.”
(ePAPR v1.1)
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