mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-28 09:38:53 +00:00
27 lines
1.2 KiB
Plaintext
27 lines
1.2 KiB
Plaintext
|
|
||
|
|
Utilities for extracting information from device-tree sources
|
||
|
|
|
||
|
|
Device trees are prominently used in the Linux world for describing the
|
||
|
|
structure of SoCs as for the parametrisation of device drivers. The utilities
|
||
|
|
found in this directory ease the extraction of interesting information from
|
||
|
|
device-tree files.
|
||
|
|
|
||
|
|
The utilities found in this directory operate on device-tree source (dts)
|
||
|
|
files as opposed to device-tree binaries (dtb) because dts files contain
|
||
|
|
information about the inter-dependencies between nodes in textual form
|
||
|
|
(labels) instead of mere numbers (phandles).
|
||
|
|
|
||
|
|
In the Linux source tree, dts files can be found at _arch/<arch>/boot/dts/_.
|
||
|
|
Most dts files leverage the C preprocessor to include fragments in the form of
|
||
|
|
dtsi files. To generate the complete device-tree source information for a
|
||
|
|
given dts file, the C preprocessor must be invoked as follows:
|
||
|
|
|
||
|
|
! cpp -Iinclude -x assembler-with-cpp -P <dts-file>
|
||
|
|
|
||
|
|
The _parse_ tool generates a syntax tree from a dts file. It is not meant to
|
||
|
|
be invoked directly but it is used as a helper by other tools.
|
||
|
|
|
||
|
|
The _extract_ tool can be used to query structural information from a dts
|
||
|
|
file and to prune a device tree specifically for a subset of devices. For
|
||
|
|
usage information, execute the tool without arguments.
|