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The device tree in an embedded Linux system describes

  • A.the directory hierarchy beneath which the device nodes are made to appear
  • B.the sequence in which the drivers will be loaded
  • C.the permissions applied to each device node
  • D.what hardware is present and where its registers and interrupts are

Answer: D

It replaces the board files that once hard-coded the same information, so one kernel image serves many boards. A driver matches against a compatible string in it and receives the addresses and interrupts from the node rather than from its own source.

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